\ADlO ©©[Χ1Κ][10®[3 Β ©QIW tLsfc® KtevTasoo CONTROL May 1990 jy J C J u ® , 7 v * ICD 08545 USA $2.95 CANADA $3.95

i i U L o ^ n volume 20, number 219 WORLD'S MOST COMPLETE MODEL PUBLICATION

® d) W D@ [m W KKaJEHtL©

Ό ( δ l o AirtronicsOur competition is has the proved best it.

Now that 1991 is almost here, Flight-Proven 1991 Technology We Care About The Modeler a lot of R/C manufacturers are finally In a word, our systems work. Whre helping advance the sport beginning to follow Airtronics' lead. Airtronics aircraft systems consistently of R/C modeling through excellence in Some of them are intnxludng equip­ provide "glitch free* operation in the our equipment Airtronics continues to ment that will operate in the 1991 most demanding narrow band envi­ develop new products and technology narrow band environment We think ronments whether it's modeler to to keep us ahead of the competition. it's about time! modeler interference, or outside ID We not only invest a great deal KHz pager interference. of time and money in product devel­ First In The Industry opment we also work to inform and We know a lot about 1991 educate modelers about the complex­ environments. Airtronics was the first ities of 1991 specifications and claims. m ajor RIC system manufacturer to V\/e believe that knowledgeable, introduce 1991 capable R/C systems. informed modelers will intelligently We were also the first and for a long choose the best equipment availabfe. time the only, R/C manufacturer to nave In the race to develop reliable our 1991 systems independently certi­ narrow band 1991 R/C systems every­ fied to meet all the AMA guidelines one else is following our lead. Despite In fact since 1988, all Airtronics' all the claims and confusion, Airtronics advanced FM and PCM aircraft trans­ We also offer a low-cost R/C still sets the standard in R/C quality, mitters and compatible Gold Label system upgrade service to convert technology, and 1991 performance. Super Narrow Band Dual Conversion your present Airtronics' AM or FM receivers have been independently transmitter and receiver to 1991 AMA tested and certified as meeting and guideline specifications and operation. We Set The Standard. exceeding every AMA and RCMA We provide modelers with an afford­ guideline and specification for narrow able alternative to expensive product ^AIRTRONICS band R/C operation in 1991 and beyond. replacement and obsolescence. 11 Autiy, Irvine, CA 92718 (714) 830-8769 Thompson

THE N e w b o o k f r o m H . A . MIGHTY “ b r i e f m g s ” EIGHTH THE MIGHTY EIGHTH, A HISTORY OF THE U.S. AMELIA EARHART. A Biography. Rich. THOMPSON TROPHY RACERS, Huntington The 8TH ARMY AIR FORGE. Roger Freeman. The Rich's exhaustively researched biography pilots and planes ol America's Air Racing Glory complele story In hundreds ot unbelievable compel downplays the sensational 'What Happened to Days 1929-1949. A wonderfully thorough bool ■ holographs and highly documenled text The famous Amelia Earha/1?' myth by disclosing who Amelia Includes behind the scenes drama, racing action, imping missions are written in exhaustive detail, really was- A wonderful profile of this unique and a discussion ot engines ot each era. From ho! it complele with first-hand accounts. Sections on the woman, a tighter for women's rights, an effective homebuilts to stripped down warbirds with the & _1u aces, the airfields, nose art, and 128 full color side activist lor commehcal aviation, her records, to Incredible stories ot such famous ships as the views of B-lTs, B-243, P-5rs and P-47V Definitely her last dream-a flight around the world. GeeBees. Bill Odom's P-51. Begin the Beguine. and the Pest Pook ever published on the subject. JUST Illustrated. 320 pgs. 6 'x 9 '. hd...4383C $19.05 the Howards, Folkerts, Lairds, and much more. 200 REPRINTED 468 photos, 311 pgs.. 8 3/4' x 11 1/4'. photos, 192 pgs.. 8 1/2' x 1Γ, stbd hardbound...... 2388C $40.00 CAL RODGERS AND THE VIN F ir The First ______2984C $19.95 F-51D MUSTANG HANDBOOK, USAF. Climb Into Transcontinental Flight, Lebow. Early history the saddle ol the famous Mustang fighter. butts will welcome this volume detailing the DEE BEE. Ike REAL Story of the Granville Familiarize yourself with the controls, run stubborn and fearless adventurer who pursued Brothers end Their Marvelous Alrplenea. through the checklist and takeoff for combat. A not only lame, but the $50,000 fortune offered by Hattke. To the buffs, the Geo Bees represented reprint of fhe official government handbook. William Randolph Hears! for the first trip across ar, speed and thrills. Designed by the Granville Originally designed to show you how to fly the this country. Author recreates me world of 1911 Chero (GB.'s). each plane had Its own mystique. Mustang, It Is printed complete and full size with and the trials and heartaches ol this historic Book portrays each model, its cMmes tragic career all the c ta 'Included lust like the original Issue. flight. 35 photos. 264 pgs., hdbd., 6 'x 9 ' and the famous pilots who llew and raced them. A Heavily IllustratedIlustrated \ with photos and diagrams...... 4378C $22.95 must lor the air-radng historian. Over 200 photos, 128 pgs.,81/2'x I f , Sfbd.....2006AA $14.95 176 pgs.. 8 1/2' x I f . hdbd DELL AH-1 COBRA. Verier. Introduced during the Airlines ______.4700C $24.95 Vietnam War, the Cobra revolutionized b.Jetielo eP>· ‘Early “YearsT WINGS OF CESSNA: MODEL 120 TO THE combat and has been continually upgraded to remain CITATION III, Ed Phillips. The complete family the most awesome combat machine flown by the U.S. of Cessna airplanes from the rag-wing 120 to Amy. Osprey Air Combat series. Slbd, 8 1/4' x I f . J j the high-tech Citation III. Experimental ships, 200 pgs, 172 ill.. 12 In color...... 2990C $22.05 one-ol-a-klnd. the CH-1 helicopter and DOGFIGHT: JET FIGHTERS IN COMBAT. Allen. military models, every one documented with Captures the excitement and beauty ol the latest a s .— technical changes by model year, specs., combat aircraft as they confront one another in mock performance, total built and serial number combat for the camera. Marvelous photography ol data. Much new Info on the classic 170 and Agressors, Tomcats. Tornados. Migs, Hamers. F-16's 190/195 models. 229 photos of airplanes and and more. Osprey Colour Library series. Sfbd.. 81/4* Instrument panels plus more than 50 detailed x 9'. 128 pgs., 120 color ill...... 3075C $14.95 3-view drawings make this a valuable DESERT AIR FORCE. Philip Chinnery. A sister , reference for the buff and modeler. 100 pgs. volume to fhe bestselling Desert Boneyard. More sfb d ...... 20 11AA $13.95 IESERT fantastic, all-color photography ol the 2.500 military I BEECHCRAFT: STAGGERWINO TO STARSHIP. aircraft stored at Davis-Monthan AFB in the Arizona Ed Phillips. Staggerwing, Twin Beech. tIRFQ RCE desert. Includes over 60 aircraft types. Sfbd.. 8 1/2' x THE RED BARON The compelling story ot Germany's WW I Ace of Aces, Bonanza. . . every production and P k 81/2'. 144 pgs . 130 ill...... 2998C $17.95 Manfred Von Richthofen, with 80 kills. His daring leadership of Jasta II. experimental Beech airplane ever flown Is JANE'S ENCYCLOPEDIA OF AVIATION. Over the "Flying Circus." downed 644 Allied planes. Personal Interviews of documented. Complete warbird coverage of 3,000 photos, 128 pages in color. Huge directory of all Jasta II and allied pilots. WWI aerial footage, dogfights and crashes, and UC-43, GB-1, AT-7, AT-11. C-45. the mighty the significant aircraft in history. With fhe vital re-ensdment ol the Baron's last combat and the controversy surrounding XA-38 Grizzly. Postwar years Including Model statistics ol more lhan 5.000 air and space cralt. his death. It's all here. Color & B&W. approx. SO minutes, 5 star rating by 35 Bonanza. Travel Air. military and export Organized in a directory formal Irom airlines to VIDCOCHOIClmagazine...... V8727C $29.96 models. T-34 Mentors. Barons. Dukes and the warplanes. Each category is developed chronologically OlANTS OF LOCKHEED. The SR-71 It your fantasy? Thlt video begins wtth legendary King Airs; they're all here plus and lists records, specs, and specific functions ol the nearly a half hour ot exquisite ground and aerial views of the Incredible much, much more. With 245 photos. aircraft. Contains material from all Jane's annuals from (old) Blackbird. Scene after scene show s off this triple sonic, turbo- Including many never published before. 34 3- 1909 to the present. 952 pgs., 8 5/8' x I f ramjet powered aircraft, built two decades ago. but still the hottest thing vlew drawings, technical specifications and ...... 3513C $29.95 In the skies. Are you a Herkybird nut? The next segment portrays the C- complete production listing from 1934 to 130 In all its glory. Then witness the awesome abilities of the C-141 1987. An excellent reference source and BOEING TRIVIA. Cleveland. Stories of som e historical guide tor Beech enthusiasts, and very colorful people from fhe receptionist to the Starlitter and the mighty C-5 Galaxy as they power their way across continents with massive loads. All color. 70 minutes. historians alike. 96 pages, 8 1/2' x 11', presidents . . . sex to barrel-rolling a 707 . . . sfbd...... 2012AA $15.95 amusing anecdotes and rare humor mark V H S ...... V8768E $32.95 Boeing's history over the years. Fun reading. 8-70 VALKYRIE. America's first Mach-3 bomber. Rare vintage scenes of PUTNAM SERIES 213 pgs. 5 1/2'x 8 1/2·. Sfbd.... 1905B $10.95 rollout In 1964. first flight. Inflight scenes showing vapor trails from flying In its own shock wave. Watch In awe as this unique mammoth BOEING AIRCRAFT SINCE 1918. Bowers. RADIO CONTROL FOAM M0DEUN0. Thomas. Here object cycles its wingtlps. opens Its afterburners, and sit stunned when H (Second edition) A Putnam Book. Describes in is a text that shows the radio control modeler the Is Involved in a mld-alr with a chase plane. Very historic. 60 detail all the aircraft produced by Boeing and newest techniques In loam modeling. Eliminate the minutes...... - ...... V8774E $32.95 illustrates the aircraft with hundreds of rare pno:cs need lor time consuming methods ol fuselage and RUSSIAN TOP GUN. It war Is declared, who will get the first :'lock-on' and many 3-view drawings. Traces the wing construction, yet build a tougher structure that and shoot his enemy out ol the sky? Sit back and watch the MiG-23, developemenl ol Boeing family of aircratt-lhe I stands up well lor the novice flyer. Everything the MIG-25, MiG-29, the long-range bombers, and the awesome M i-24 Hind marine types, trainers, early transports, lighters, 1 modeler needs to know is here. 150 photos and helicopters In action. Make up your own mind who will coume out multi-engmed bombers, and jet transports in the diagrams. 172 pgs.. 6' x 8 1/2'. victorious. 40 minutes, color...... V8708B $14.98 1960's. Updated and expanded to cover the slbd...... 2983C $15.95 AIRLINES, THE EARLY YEARS. A four-part program Includes historical company's output since the book was issued in I U.S. NAVY AIRCRAFT 1921-1941, review of operations of United Airlines, with their Boeing and Douglas 1966.430 photos. 95 tine drawings. 560 pgs. 5 r s x A V Y ^1 U.S. MARINE CORPS AIRCRAFT 1914-1959, mallplanes: an early history of Lufthansa, the German giant with their 1/2'x 81/2', hdbd...... 8397C $35.95 AIRCRAFT Larkin...... 3914C $27.50 first Atlantic crossings In seaplanes: and a vintage film of federal mt-m\ JACK NORTHROP AND THE FLYINQ WIND, regulations and air carrier certification with scenes of Constellations and GENERAL OYNAMICS AIRCRAFT AND THEIR Coleman...... 4450A $24.95 DC-7'e. 70 minutes...... V8777E $32.95 PREDECESSORS SINCE 1909. Wegg A. Putnam US. .MARINE Book. Provides a background, not only on Genera: CORPS REVOLUTION IN THE SKY, Allen....3490C $24.95 THE AIRSHOW. The most spectacular performances of the US Blue Dynamics, but on a range of manufactures no AIRCRAFT Angels. Italian Freece Trlcoforl. Canadian Stnowblrds plus the Brazilian longer in existance. From Gallaudet. Dayton- CIERVA AUT0GIR08: The Development of and French national aerobatic teams as the perform Bt the Canadian m -m t Rotary-Wing Flight, Brooks...... 4354C $35.00 Wright, Consolidated. Thomas-Morse. Hall. Abbottsvord International Alrshow. Take your seat In the cockpit of the Stinson, Vultee. Barkley-Grow and Convair, to the THE PIPER CLASSICS, Christy...... 4208A $11.95 world s fastest and sexiest aircraft as they swoop and soar wlngtip to General Dynamics ot today. A va'uabie re'erence Or CESSNA 150 & 152, Clark...... 1141A $12.95 wlngtlp. Witness exhibitions of the Harrier. Tomcat, Concorde and SR-71 the historian. 300 photos. 384 pgs., 5 1/2* x 8 CESSNA 172, Clark...... 1140A $12.95Blackbird.60minutes. A REVIEWER'S CHOICE...... V8979N $19.95 1/2·. hdbd...... — ...... 3396C: $42.95 THE PIPER INDIANS, Clark...... 4213B $16.95 TAKEOFFS AND LANDINGS MADE EASY A very Intense In-cockpit review GRUMMAN AVIATION, Franclllon T-6 TEXAN In Aotion. The North American T-6 of the proper techniques for regular, crosswind, short and soft field ..3395C $35.95 Texan Is one ol the most famous trainers of all landings and takeoffs. John King files you through each one and Martha SHORTS AIRCRAFT afnoe 1900, Second Ed.. time. In WWII it was built In larger numbers and King recaps the flight with added details. Includes talldragger takeoffs Barnes...... 3398C $33.95 trained more pilots than any other trainer In and landings. 60 minutes... - ...... V8375E $39.00 SUPERMARINE AIRCRAFT elite· 1914, history. After the war, the T-6 continued to serve Revised Ed.. Andrews $ Morgan in the training role and as a light ground attack ...... 3399C $29.95 aircraft. Over 140 photos. 50 detail drawings. 3 PILOT MANUALS CURTISS AIRCRAFT, 1907-1947, Bowers pgs. of scale drawings, 13 color painting. 58 nnc 4199Δ *7 Bfi P-38...... 1401B $8.95 B-25...... 1410B $12.95 33S3C $34 95 P-39...... 1402B $8.95 B-26...... 1411B $14.95 UNITIEB STATES MILITARY AIRCRAFT sine· new In-Action P-40...... B-29...... 14128 $9.95 1909, Swanborough & Bowers T-28 TROJAN In Action...... 4117A $7.95 P-47...... 1404B $8.95 F-6F...... 1413B $9.95 ...... 4362C $49.95 SUKHOI In Action...... 4118A $7.95 F-51D ...... 2006AA $14.95 FM -2...... 1414B512.95 LOCKHEED AIRCRAFT since 1913, Franclllon CH-47 CHINOOK In Action...... 4119A $7.95 P-61...... 14058 $9.95 AT-6...... 14158 $9.96 ...... 3 3 7 7 C $29.95 OV-1 MOHAWK In Action . 412QA $7.95 P-63 ...... 14C6B $9.95 ...... 1416B $4.95 M c Do n n e l l d o u g l a s a i r c r a f t sin ce LI-2 SPYPLAN E In Action...... 4111A $7.95 F-80...... 1420B $9.95 Hurricane ...... 1417B $4.95 1920, Franclllon...... 3384C$39.95 0-1 BIRO 00G In Action...... 4112A $7.95 P-82 ...... 1407B $9.95 ...... 1418B $4.95 JAPANESE AIRCRAFT OF THE PACIFIC WAR, AH-64 APACHE In Action .. . .4123A $7.95 B-17...... 1408B $10.95 Me262...... 1419B $9.95 Franclllon...... 3158C $21.95 SHORT STIRLING In Action..... __4132A $7.95 B-24...... 1409B $12.95 GERMAN AIRCRAFT OF THE SEC0N0 WORLD WAR, Smith & K ay...... 3157C$39.95 14 DAY MONEY BACK GUARANTEE Historic Send Items: Call us Toll Free P le e s e S 3.96— Handling Aviation P r in t Total Enc. - 800-225-5575 Name__ $------U.S. Funds . 3850 H CORONATION RD.. EAGAN. MN 55122 MN, AK. and foreign countries use 1 -612-454- Charge: □ VISA □ MasterCard Address_ 2493 (not toll free). Charge VISA or Master­ Acct. No______City____ Card. MN residents add 6% sales tax. Dealers invited. Authors manuscripts invited. Exp. D ate______State___ -Zip- . Country. MODEL 0 MAY 1990 BUILDER volume 20, number 219 898 West Sixteenth St., Newport Beach, California 92663 Phone (714) 645-8830 ■ STAFF EDITOR/PUBLISHER CONTENTS Wm. C. Northrop, Jr. GENERAL MANAGER Anita Northrop

FEATURES ASSISTANT GENERAL MANAGER Dawn Johnson WORKBENCH, Bill Northrop ...... 6 MANAGING EDITOR DEAR JAKE, lake D oe...... 7 Richard Dowdy OVER THE COUNTER ...... 8 PRODUCTION ARTIST Kimber Jett-Baird

R/C SOARING, Bill F orrey...... 11 DRAWINGS BY Al Novotnik BIG BIRDS, Al A lm a n ...... 14 ACCOUNTING MANAGER ELECTRIC POWER, Mitch Poling...... 16 Robert Ruiz SUBSCRIPTION MANAGER "I AIN'T GOT IT," Bill Northrop ...... 18 Audrey Peterson

SCHNEIDER CUP/LAKE HAVASU, Bob Martin ...... 20 OFFICE STAFF A. Valcarsel ALL ABOUT ARFS, Art Steinburg...... 25

HELICOPTER WORLD CHAMPS (Conclusion), lames Wang ...... 28 CONTRIBUTING EDITORS Al Alman John Pond PLUG SPARKS, lohn Pond...... 32 Jake Doe Fernando Ramos Bill Forrey Francis Reynolds ONAIR 1700E REVIEW (Conclusion), bhi F o rre y...... 38 Bill Hannan Stu Richmond Dick Hanson Bob Stalick JET TRAILS/1989-90 TANGERINE, w a llyZ o b e r...... 40 Ken Johnson Art Steinberg KALT CYCLONE ll/JR MAX 5H FM, lames W ang...... 42 Eloy Marez Ron Sweeney Walt Mooney John Thompson BOB VIOLETT MODELS F-86 SABRE, Dave M achione...... 46 Mitch Poling James Wang

MODEL DESIGN AND TECHNICAL STUFF, Francis Reynolds...... 49 ADVERTISING Corporate Office: (800) 243-9593 ELECTRONICS CORNER, Floy M arez...... 50 In California: (714) 645-8830 HANNAN'S HANGAR, Bill Hannan ...... 56 or Al Novotnik FREE FLIGHT, B o b S ta lkk...... 58 4 Beverly PL, Norwalk, CT 06850 Bus. Phone (203) 847-7478 CONTROL LINE, J o h n Thompson...... 62 MODEL BUILDER (ISSN 0194 7079) is pub­ lished m onthly by RCMB INC., 898 W. 16th St., Newport Beach, California 92663. Phone (714) CONSTRUCTION 645-8830. Subscriptions: $25.00 per year, $47.00 for two ERSATZ JU-37 BOMBER, Alex McLeod...... 22 years. Single copies $2.95. Subscriptions out­ side the US (except APO & FPO) $38.00 for one BOB ROMEISER'S “ CRUSADER," lohn B la ir...... 36 year, $68.00 for tw o years. All payments must be in US funds, drawn on a US bank. PIPER PA-15 "VAGABOND,” Walt M ooney...... 52 Copyright 1990 by RCMB Inc. All rights re­ served. Reproduction without permission prohibited. Change of address notices must be received six weeks before date of issue that new address takes effect. Send old address with new. . . old Cover: Dave Malchione's F-86F Sabre was built from a Bob Violett Models kit. and reviewed in label preferred. Duplicate issues cannot be this issue, beginning on page 46. sent. Postmaster send address changes to Also reviewed in this issue is the Kalt Cyclone II helicopter (see insert) along with the JR MAX Model Builder, 898 W. 16th St., Newport 5H FM heli radio, both from Hobby Dynamics Distributors. Review by James Wang begins on Beach, California 92663. page 42 of this issue Second class postage paid at Newport Beach, California, and additional offices.

2 MODEL BUILDER Soon to be ; near you.

In the past, only pilots who flew 40 sized aircraft could experience our powerful ASP engines. • Powerful Schnuerle porting! Well, no longer. We are proud to introduce • Twin ball bearings - not bushings! three new engines in two larger sizes to the ASP line-up. • New carburetor design! For those who fly models in the 60-65 range, we • Backed by an experienced factory have two engines - the ASP 61 FSR ABC aircraft and the ASP 61 FSR Ringed helicopter. With service department features like powerful Schnuerle porting, one iece steel crankshafts, twin ball earings, and easy to operate carburetors, both engine compare All ASP aircraft engines favorably to other sixty sized engines on the market. The come complete with a aircraft version utilizes a ABC carburetor and muffler. piston/cylinder assembly for extremely high power. All ABC ASP engines use cylinders which All ASP helicopter are only chrome plated on the engines come complete inside. This allows the heat build-up to dissipate easier which with a deep-finned prolongs the life of the engine. cylinder head and The helicopter version has ringed carburetor. piston. While not as powerful as an ABC, it is much easier to start; New eye-catching packaging! ASP engines are a registered a real plus in any helicopter. trademark of World Engines Inc. A large, deeply-finned cylinder head is standard. Our new 91 FSR ABC is the biggest ASP yet. It is not just a bored out 61, but an entirely new WORLD ENGINES INC. design. 8960 Rossash Road. Cincinnati. Ohio 45236/1288 Phone: (513) 793-5900 · Fax (513) 793-7337 , ASP engines are available exclusively through World Engines dealers worldwide SIG CLASSIC SCRIES RUBBER POWERED FREE-FLIGHT MODELS MR. MULLIGAN

KIT FF-21 K IT F F -23

Wingspan: 20

Wingspan: 20-1/2" Length: 16" $9.50

Wingspan: 23-1/2' Length: 22-3/4" Weight: 1 oz.

Wingspan: 24' Length: 16"

MONOCOUPE CABINAIRE

Wingspan: 22" Wingspan: 23" Weight: 1-2 oz. Length: 26”

MINI-MAXER

Wingspan: 21-1/2' Weight: 1 oz. SIG TIGER Wingspan: 20’ CUSTOMAIRE Length: 18”

See your dealer first! If not available, call 800-247-5008 toll free for orders only. For domestic orders under $15 add $2.50 postage. Over $15 ppd. Latest Catalog - $3.00 ΘΒ SIG MANUFACTURING CO...... Montezuma, IA 50171 ^sigst BUY FROM AUTHORIZED SIG DEALERS ^sig?

DEALERS: Write For Details On How Your Name Can Appear In This Column FAREWELL, WALT On March 1st, 1990, Walter E. Mooney, age 64, passed away. How can one let go of such a friend? By reflecting upon his accomplish­ ments? By remembering joys shared with him? Walt was an artist, author, engineer, historian, test pilot, lecturer, TV per­ former and possibly the most produc­ tive designer of model airplanes in the United States, if not the world. Truly a "total aviation person," he was equally at home in the spheres of model aircraft, sailplanes, lightplanes and aerospace vehicles, although one suspects that the smallest ones were his favorites. Walt’s enthusiasm for life was con­ tagious . . . he delighted in sharing his pleasures with others. . . and gave free­ ly of his encyclopaedic knowledge. His energy seemed boundless, and he packed more living into a day than any­ one else I’ve ever met. His curiosity was unlimited, extending far beyond avia­ tion, encompassing animals, especially birds, all types of machinery, languages Walter E. Mooney, Jr. June 6, 1925-March 1, 1990 and philosophy. He had friends throughout the world, and a large portion of his sparef?) time dozen new Peanut Scale models! And, willingness to share. was devoted to answering mail. He also his positive outlook made such an im ­ One special experience stands out: had strong feelings for political injustice pact on the nurses that they told him he During a glorious summer day near and used his powerful pen to make his was one of the very few patients they Lake Elsinore, California, one of Walt’s opinions known. Counterbalancing this didn’t want to leave.... models caught a thermal and headed was his remarkable ability to deliver Walt leaves us with a rich legacy . . . for the horizon, with the two of us run­ jokes and puns in apparently endless his fam ily. . . all of whom are endowed ning, eyes skyward, to keep it within variety. with sizeable portions of his philosophy, view. When the model finally landed To Walt, each day was a new adven­ his legion of friends who will help keep we were far from the contest site and ture, and he made the most of it, finding his memory alive, and, of course, his weary from the long chase. It was only "silver linings” even in situations which designs which are now such an integral as we gazed around us that we noticed would have discouraged most people. part of both full-size and miniature thousands of brilliant wildflowers in For example, when confined to a hos- aviation. variegated colors extending in all ital bed some years ago with a serious In thinking back over the many years directions. As we sat down among them eart condition, Walt didn't feel sorry it was my good fortune to know Walt to rest, Walt turned to me and said: for himself at all. Rather, he seized the Mooney, I remember most his cheerful “ You know Hannan, this is probably as opportunity to design and draw half a disposition, optimism, patience and close to Heaven as we’ll ever be here on earth.” How right he was.... Bill Hannan

/ f o m B f ti

w o r k b e n c h

e have neither the desire nor the W capability of adding anything to the words so well written here by Bill Hannan in the memory of Walt Mooney. We only wish to express our own personal sadness over the loss of a good friend, one who allowed us to be the outlet for his teachings in the fine art of building and flying small scale model aircraft. No one has or will replace him. It is ironic, but perhaps most fitting, that the last unpublished design by Walt

6 MODEL BUILDER jabs at our production slip-up, which can I remember Anita mentioning she was only be written off as "Haste makes waste." looking for a new editor, so perhaps you However, some seriously commented that had a rookie in training. On the other we really shouldn't drop this convenience hand, the date for the makeup of the to the readers, while one writer is still wait­ March issue was probably just about the ing for the next issue in hopes that the time you were up to your ears in prepara­ construction article for Don DeLoach's tion for the Bostonian Nats winner will continue. We In any case, I’m sure I'm not the first told him to check page 86! person to mention this. I assume that in We particularly enjoyed the following April things will be back to normal. By the letter from Don Nix, proprietor of Power- way, this letter will not be master Products, Inc.. . . see ad in this issue (Continued on any page) ... who conjures up a variety of glow fuel Yours very truly, mixes (He oughta call ’em Nix’es Mixes). Don Nix Dear Bill, SPECIAL IMS INFO lust thought I’d drop a note to say that I IMS has arranged for special travel rates enjoyed the March issue of Model Builder. with Delta Airlines to and from the Atlanta As usual, you cover a wide range of model­ and Milwaukee IMS Model Sport and ing topics. However, I did notice one thing Hobby Shows. Delta is providing a 40 (forty) that kind of had me wondering a bit. Sev­ percent discount off its domestic full round eral articles seemed to start and trip day/night coach fares. In addition, a 35 The first time this happened, I thought (thirty-five) percent discount off Delta’s full that perhaps something had simply round trip day/night coach fares will be slipped. Then, once again, I would start a offered for Canadian travel. For all of the story, get engrossed in reading it, and suddenly, without warning, it Continued on page 65

Mooney to appear in Model Builder, in this issue, has been sitting in our file for almost a year. As you will see, it is a 16-inch span model of his own Piper “ Vagabond, rr jT‘1 and there is absolutely no explainable rea­ 1 son why it has not been published until > .· now. That is not to say that the decision had already been made to publish the model in this issue before word came of his passing, but the question does come to mind, "W hy had we been saving it?” Walt even suggested in his note with the article, "If you want to shrink it to Peanut size, go ahead, but you'll have to ‘doctor’ the text in a few places.” Some months later, prob­ ably as a gentle reminder, he sent along the color slide, probably taken at Torrey Pines, as he made a pass along this well known slope soaring site. We will repeat some of Walt’s Peanuts from time to time, particularly those pub­ lished in issues which are no longer avail­ ADVICE FOR THE PROPWORN able. Bill Hannan was c o rre c t.. .as long as —By Jake there are balsa sticks and covering tissue, Walt Mooney will never be forgotten.... Dear lake: Dear Bob: WHERE ARE THE KIDS? I'm having radio problems with my The cabane strut gets its name from This question has been beaten about by Windward R/C glider. When I push the Descartes Cabainne, a French aviator later columnists, by letter writers to editors, by stick to the right with my right hand, the associated with the famed Lafayette Esca- serious thinkers, by even more non-think­ airplane turns right. But when I push the drille of World War I. ers, and particularly by groups of long-time stick to the left with my right hand, the Cabainne was an advanced thinker and modelers who “were there” during the airplane turns left. Consequently, if I use long before the war he envisioned aerial rapid growth era just prior to WW-II. It has my left hand to push the stick to the right, combat and its requirements for maneu­ come up again in this issue, in Bob Stalick's the airplane turns right. I could almost verability, strength, and speed. He saw that "Free Flight” column, and we'd like you to understand that, but if I push the stick to tight maneuvering required strong wings, take a look at it, even if you don’t ordinarily the left with my left hand, the airplane but that a biplane’s wire bracing added read the column. Bob has quoted Ken turns left! drag and slowed the aircraft. Sykora, editor of the Flightplug newsletter What do you think the problem might His first experimental aircraft, "L’Ois- of the SCIFS, Southern California Ignition be! seaux DeCrepe” (The Ruptured Quail), Fliers Society. We have quoted some of Anson in Milwaukee simply eliminated the wing wires in order Ken’s editorials in this column over the Dear Anson: to assess their contribution to the aircraft's years, and for good reason. Lots of people Sounds like you’ve got an interm ittent— structural integrity. Having answered that, can write, but only a chosen few can really between your eyebrows. and after having his casts removed, Ca­ say something in the process. . . Ken is one Jake bainne built "Le Grande Pechez” (The of those. Large Carp). This second aircraft had extra CONTINUED ON PAGE.. . * * * and beefed-up struts to compensate for We have received quite a few letters Dear lake: the missing wires. The plane performed from readers concerning several missing Why are the central top wing mounts on well in flight, but having no negative G "Continued on page so and so’s" in the a biplane called cabane struts? March '90 issue. Most were good-natured Bob in Donnelsville Continued on page 68

MAY 1990 7 OVER THE COUNTER A ll material published in "Over the Counted' is quoted or paraphrased from press releases, furnished by the manufacturers and/or their advertising agencies, unless otherwise speci­ fied. The review and/or description o f any product by MB does not constitute an endorsement o f that product, nor any assur­ ance as to its safety or performance by MB.

ick Ziroli Plans, 29 Edgar Dr., Smith- N town, NY 11787, has announced the release of its construction plans set for a Giant Scale B-25, famous WW-II medium bomber. At 1/8 scale, or 1-1/2 inches to the foot, the model spans 101 inches, has a length of 79 inches, and comes in at 30 to 35 pounds in weight. The prototype, built by Bill Steffes, placed second in its category at the 1989 WRAMS show, and has flown many times since then. Construction, as with all of Nick’s designs, is conventional balsa and plywood. Plans consist of four sheets, with all parts full size. Both glass and gun nose versions are shown. Plans also show installation of flaps and Robart retracts. The prototype was powered by Zenoah G-23 gas engines turning 15 x 10 props. Two-cycle glow engines .90 to 1.08, The Seamaster 120, (rom Ace R/C. or .90 to 1.2 four-cycle, can also be used. Cowls and canopies, including nose, turret, on tissue," is in reality a tough synthetic Suite 281, Simi Valley, CA 93065, phone side, and two versions of the tail gun posi­ material which is airtight, waterproof, and (805) 581-5061, FAX 805-527-9114, now has tion are available. Price of plans is $38.00 resistant to glow and diesel fuels (also Litespan in stock. Weighing about one p.p. in the U.S. For a complete catalog of all rubber lube). It is also resistant to tears, ounce per square yard, Litespan comes in plans and accessories, send $2.00 to the punctures, and careless fingers. And best two styles. The first has a tissue grain with above address. Catalog is free with a set of of all, it is finally available in the U.S.! the appearance of having several coats of plans. Charlie's R/C Goodies, 2828 Cochran St. clear dope . .. glossy, but without a plastic * * * look. Itcomesin Red, Yellow,Orange,and We first mentioned this next product Blue. They all have almost a luminescent almost a year ago, following the Toledo appearance, and the blue is just gorgeous! Show. For all intents and purposes, you The second style is more opaque: Dark could call it "iron-on tissue," because that's what it looks like, what it feels like, and if you could remove a 20 by 36-inch piece of tissue after it has had about three to four coats of dope added, and compared the two, what it weighs like! The biggest dif­ ference between the two is that real tissue, as anyone who has used it knows, just loves to be torn, punctured, and have careless fingers poked through it. On the other hand, Litespan, which we like to call "iron- Fuse/swltch harness by Ace R/C.

Jaguar XRJ10, 1/10-scale on-road car from Associated Electrics. Machine-cut balsa props from Superior Props.

8 MODEL BUILDER “EZ" Fuel Tubing, from Ace R/C. Clipped Wing T-Craft, D.G.A. Designs' plans.

his “ tissue” covering the poke test, but be with an Eppler 374airfoil, a die-cut Lite-Ply sure to ask him before you poke, not after! fuselage featuring "Tee-Lock” Alignment Litespan is available direct, with addi­ Tabs, pre-cut sheet balsa tail feathers, and a tional shipping and handling charges. complete hardware package. Standard discounts are available to dealers. Another new product from Sig is called SuperStripe. It is not just another trim tape, “Double Snuff' muffler by J’Tec. Before we leave Charlie's R/C Goodies, here are two more new products available: but has several special features, the most Glow Head Adapters for .049, .051, .09, and notable being that its adhesive is totally .15 Cox engines. Replace the standard glow head with this adapter, and you can use your favorite standard glow plug, particu­ larly shorts, though long reach can be used in some cases. Just be sure to check for clearance with the piston at TDC (Top Dead Center). Prices range from $3.25, to $3.95, to $4.15. The second item is iron-on hinges that can be applied directly over clean wood, Taps and matching drill bits from Ace R/C. sheeted, or Coverite covered surfaces. Green (for WW-I aircraft). Antique Eliminates control surface gap and in­ Giant scale Cessna-type gear from Ace R/C. (Cream), Black, White, and Silver (a shiny creases control efficiency. One-inch hinge textured aluminum effect). The sheets are material, for surfaces up to 1/4 inch thick, fuel proof. It also has a very high gloss and 20 x 36, weigh about .56 ounces per sheet, 36 inches long, is $2.05. 1-1/2 inch by 36 is very thin, and works well over painted or and all can be painted or doped. To apply, inches, for surfaces over 1/4 and up to plastic film surfaces. It is made from a spe­ the framework is first coated with Balsaloc, 1/2-inch thick, $2.35. cial elastic polymer so that it will bend and then the covering is sealed to the frame ♦ * * go around any type of compound curve with a film-type covering iron, and then The word "Ninja” conjures up thoughts very easily. The high nitro fuel used to test shrunk by iron or heat gun. Litespan is of martial arts, Black Belt, and the like, but the adhesive damaged the painted surface priced at $3.00 per sheet, and a 110 gram jar among R/C slope soaring enthusiasts, it it was adhered to but did not loosen the of Balsaloc, enough to install 7 to 10 sheets will now bring forth visions of a sleek, tape. The tape is also packaged in such a of Litespan, is $4.00. In addition to light­ penetrating, aerobatic slope soarer de­ way that it will not "telescope” when weight R/C models, and particularly the signed by M ike Pratt and available in kit stored away until used. SuperStripe comes popular hand launch R/C gliders, we ex­ form fro m Sig M anufacturing, M onta- in eight colors: orange, silver, yellow, dark pect to see a lot of Litespan on free flight zuma, Iowa 50171. Listing for a very rea­ blue, black, white, medium blue, and red. models belonging to those who are not sonable $59.95, the Ninja spans 58 inches In 36-foot lengths, it comes in widths of totally locked into tradition. When in­ with 500 sq. in. wing area, a length of 39 1/16,3/32,1/8,3/16, and 1/4. Prices range stalled, it looks so much like doped tissue, inches, and a flying weight of 30 to 32 from $1.99 to $4.25 a roll. Hmmmm ... that you’ll have trouble telling the differ­ ounces. For fast construction, the wings thin, glossy, good adhesion.. .sounds like ence. Just ask the modeler if you can give are 1/16 sheet balsa covered foam cores just the thing to do a custom striping job

B-25 built from Nick Zlroll Plans. "Ninja” slope soaring R/C gilder from Sig Mfg.

MAY 1990 9 Lltespan synthetic tissue from Charlie's R/C Funk B-85-C built from D.G.A. Designs plans. Goodies. For that cordless screwdriver, you can on the c a r. . . full size, that is .. . . now have a set (or two) of drill bits to fit the * * * chuck of the screwdriver. One set has four Ace R/C, 116 W 19th St., P.O. Box 511, sizes: 1/16, 3/32,1/8, and 5/32. The other H igginsville, M O 64037, phone (816) set has three sizes; 3/16, 7/32, and 1/4. 584-7121, has a whole bunch of new items, They cost $11.98and $12.98 respectively,or the biggest one without question being you can buy individual bits from $2.98 up the newest version of the Ken Willard- to $5.29. But get the sets. You’ll always designed Seamaster, the 120. As the num ­ need the size you didn’t buy if you only get ber implies, this 85-1/2 inch span flying one or two. How am I doing, Tom? boat is designed to be powered by an en­ Giant scale aircraft need giant scale land­ gine in the 1.20cu. in. size range. The wing ing gears. Ace has a Cessna-style biggie area is 1432 sq. in., length is 75 inches, and that has a 19-1/4 inch tread, 7-1/8 inches the flying weight is 16 to 18 pounds. The high to the axle, and a 5-1/2 inch wide by pylon-mounted engine and T-tail stab stay two inch m ounting base at the center. It’s Drill bits for cordless screwdriver, from Ace R/C. made from T-6 aircraft aluminum and cut to fit the 4-120 fuselage. Price is $19.95.

Yokomo YZ 10 Spur Gear Adaptor, Associated Electrics.

Back to the nylon tubing again, but this time it comes with a solid nylon inner rod, Yokomo YZ 10 Belt & Pulley Kit, Associated and is for a "no RF noise” throttle linkage. Electrics. Called Flex Throttle, you heat-bend the the usual fuel line and its various attach­ outer tubing to give you a curved run from ment and leakage problems. Ace offers the throttle servo to the throttle arm on the "EZ” Fuel Tubing. This is stiff nylon tubing, carb. Nothing you can jam against it will 1/8 inch O.D., .096 inch I.D. which is a per­ pinch the tube so the inner rod can’t travel fect replacement for the brass tubing nor­ Continued on page 70 mally used in fuel tanks. But not only that, it can also be bent to any shape using a heat gun, so it can run from the tank right up to the engine and pressure nipple. A short piece of regular fuel tubing is used to Concept II rocket line from MRC. make that connection. Engine heat does clear of the water while accelerating, while not affect the tubing, so you can virtually the high lift wing and double-stepped hull wrap the “ EZ" tubing around the engine in get it up on plane and off the water in short a tight installation. A $1.25 package in­ order. Lite-Ply is used generously in the cludes four 12-inch lengths of "EZ” Fuel construction, with lock-tab locaters to Tubing. keep things in line during assembly. The Drilling and tapping requires to things wing is two-piece for easier transporting, ... a tap, of course, but also the correct and a landing gear kit is available separately size drill bit to make a hole to be threaded for flying off of dry surfaces, making the with the tap of your choice. Unless you do Seamaster a true amphibian. Retail price of this ten times a day, you’ll be digging the kit is $199.95, landing gear is $14.95. around for your tap/drill chart and if you Now to the small stuff. First there is a locate it, find that you need a bit that is f use/switch harness for electric aircraft and bigger or smaller than your standard sizes. boats. It is pre-wired, using FlexMaster 16 For $10.98, Ace has a drill/tap set that gauge wire, a 15-amp spade type fuse, and covers the five most used sizes for model a heavy duty toggle switch. Fuse unplugs building; 2-56, 4-40, 6-32, 8-32, and 10-32, for easy replacement. Price $5.00. plus the approximate drill bits, all packaged Next comes a really new approach to in a handy pouch. Sig Super Stripe trim tape.

10 MODEL BUILDER By BILL FORREY

his year's International Modelers Show mit the MicroPro’s use with four to eight- T at Pasadena, California produced what channel receivers. must have been a record turnout for sail­ It has four electronic trims (aileron, ele­ plane exhibitors. As in the past, it was a vator, rudder, and flap or throttle). It also typically Southern California mix of mostly has in-flight automatic trim (for aileron, slope soaring aircraft with a smattering of elevator, and rudder) which at the touch thermal and electric designs to make things of a button allows you to redefine servo even more delightful. neutral trim while flying, leaving the trim To thoroughly review all that was seen tabs in physical neutral. This eliminates the or heard directly or indirectly related to fly, land, recalibrate neutral, and refly test soaring at this IMS is just not practical or routine that we are all used to. even possible. Instead, I will attempt to hit All eight servos’ end points are adjust­ the highlights as I saw them, and apologize able, and so are the neutral points (I be­ Slope Scale booth brimming with beautiful W W -II to those who may be left out. lieve). This makes model setup a breeze, war birds. PSS really growing, following trend set ACE R/C, INC. and eliminates many headaches related to In UK. Ace had two new items of greater than linkages. usual interest this year. The first item was There is a built-in stopwatch function rates (A/E/R), a throttle (flap) preset, and the long-awaited Ace MicroPro 8000, an for countup or countdown timing. There is memory for eight aircraft setups. All pro­ eight-channel computer radio. The second a digital voltmeter which also has a beeper gramming and calibrating is menu driven, was a newly designed two-meter sailplane to let you know when to land—or else. and is done with the control sticks, not a to be released in kit form. There is a tim er which lets you know how keypad. Owi ng to the very nature of its myriad of long the transmitter has been left on since Physically, the transmitter has a vinyl clad functions and features, there is just no way you last charged its 800 mAH Ni-Cds. aluminum case with metal gimbals and I can do this radio transmitter the justice it In the mixing department, it has the sticks. You have a choice of single or dual deserves in just a few paragraphs. Paul Hol- flexibility to mix any channel with any stick configurations. Two things I’m not sten from Ace took at least fifteen, maybe other channel and in any manner (uni or clear on. The first is whether this trans­ twenty minutes of his time to demonstrate bidirectional). In addition, it has prepro­ mitter is AM or FM (or FM/PCM). The some of the MicroPro’s programmability, grammed differential aileron mixing, V-tail, second is whether it is only available as a and although it looked simple enough, I and elevon mixing. You may have expo­ transmitter for under $375.00 (Ace’s target doubt I can relay a fraction of what he said. nential throw on aileron, elevator, rudder, price), or whether you can buy it as a com­ In general, the MicroPro 8000 has six and throttle (flaps) with your choice of plete system (I would assume this is pos­ proportional channels and two switch nine curves (from soft neutral to hard neu­ sible!). function channels. You have the option of tral). There is also an aileron coupling Transmitter news aside, Ace also had on transmitting four to eight channels to per­ function which is adjustable, three dual display a two-meter sailplane prototype

Ace R/C’* Tom Runge loft* new Easy Eagle two-meter «allplane. Note Mark Hambleton and his new Windstar I (and II) long wing ship*. Slope Micro-Pro eight-channel computerized Xmltter at bottom. racer and thermal versions available.

Gheetah Models slope combat and aileron trainer models, Cheetah and Sheryl Hambleton with Stryker (L) and Microfly slope ships. Military paint Super Cheetah. Replaceable parts make combat practical. job makes Stryker look like true Jet fighter, which it Isn't

MAY 1990 11 VS booth too crowded to get decent picture until after closing! So many Cliff Hanger Models featured nine PSS ships and one non-scale aerobatic neat gliders, so little time to build them all! model. Note all new F-18 Hornet. Something for everyone.

New Saphlr from Robbe Model Sport An ARF gilder In two spans: 96 or 112 inches. Can also be converted to electric. Great model for those with little building time. he reports that it has excellent flying abili­ The Southwind is a polyhedral, inter­ ties. Any questions you may still have can mediate contest or sport sailplane that is be answered by writing Ace directly at: 116 designed to use flaps for camber changing W. 19th St., P.O. Box 511, Higginsville, M O or landing approach control. It sports a 64037, or by calling (816)584-7121. Schuemann-like wing planform, but with AMERICAN SAILPLANE DESIGNS only one wing tip panel per side, its not Jeff Fukushlma, designer and proprietor of Vor- tech Models. A P-51 and Zero PSS gilders forthe Gary Anderson is truly a sailplane lover. much different than a Gentle Lady. The acrobatically Inclined. He loves gliders so much that he went into wings come apart at the center as do the business as a mail order distributor for stabs fo r easy transporting. You get com­ designed by Harley Michaelis called the many off-brand and name-brand designs. plete hardware, machine cut parts, hand “ Easy Eagle.” It is a polyhedral ship with Because of this, it's always a good idea to selected woods, and an easy-to-repair flaps, rudder and elevator, Schuemann in­ check with him when you are looking for balsa and spruce fuselage. spired multi-sweep leading edge, "ta b u ­ any unusual kit sailplane. You can do this The Southwind spans 99 inches, has a lator spars," and a Selig airfoil (which one, by calling (619)575-5133, or by writing 2626 wing area of 780squares, features the good they weren't sure). Coronado #89, San Diego, CA 92154. old Eppler 193 airfoil, has a root chord of 9 A friend of mine from the St. Louis area, At the IMS this year, Gary introduced inches and a tip of 4.5, weighs 45 ounces Mark Nankivil, is testing this sailplane, and two new medium-tech competition sail­ (or more) for a 8.8 (or higher) oz./sq. ft. planes. They are the “ Southwind” and wing loading, and is 51 inches long. Gary’s “ Westwind.” Because no brand name price is a reasonable $74.95. other than Gary’s own appears on the show The Westwind is more of an advanced brochure, I believe he is the exclusive dis­ contest or sport sailplane. It features flaps, tributor. ailerons, all-flying stabs, and rudder, which

The new shape, Cox Cobra, slngle-stlck radio, In Glideslgns “Lance" (“Lance-A-Lot" not shown). Keith Schwemmer, designer of R/C flying wing two or three channels. Milled hollow wings from solid balsa. See text "Genesis." Watch for Keith Shaw's, coming.

12 MODEL BUILDER Curt Oliver. Celebrity Aerotechnlcal Designs, with T-tail R/C HLG. F 14 Katie Martin with Bob Martin Models Coyote and SR7, re-released near­ overhead is R/C; small one, along with other kits on rack, is free flight. indestructibles. Facility in Havasu is again cranking 'em outl

Gary Anderson, American Sailplane Designs with Westwlnd thermal com­ Mini I and Kam-U aerobatic slope gilders from K&A. Will also custom cut petition sailplane, uses S3021 airfoil. New Southwlnd not shown. form cores. See text for more. makes this an excellent choice for radios familiar with them already. Suffice to say like the Airtronics Vision or Ace MicroPro. they are rugged with a capital R, attractive, It too is Schuemann-like in appearance and fun to fly. If you fly from a slope that with a flattened Gentle Lady wing plan. likes to chew up your sailplanes, try one of Unlike the all built-up Southwind, the these, you’ll like ’em. Westwind comes with foam core wings CELERITY AEROTECHNICAL DESIGNS and built-up fuselage. This company is just getting off the Specs for this ship are: wingspan, 102 ground with a handful of products that are inches (can be chopped to 100); root really neat. If any of you out there have chord, 10 inches; tip chord, 6.5 inches; kids from ages five to on up, you’ve got to wing area, 844 squares; airfoil, Selig 3021; try CAD’s "War Wings” hand launch glider weight, 60 ounces; length, 50.5 inches. jets. They aren't R/C, but they are gliders Gary is asking a fair $125.00for this sailplane and they really do fly. There are F-14 Tom­ kit. cats, F-18 Hornets, Russian MiG-23 Flog- BOB MARTIN R/C MODELS gers, and Russian SU-27 Flankers. All are From out of the Lake Havasu area comes about 10.25 to 16.25 inches in span and a pair of re-releases that will send many to about 14 to 17 inches long. They come their local hobby shop with cash in hand. machine precut from balsa, and glue to­ Katie Martin says that the Coyote and SR-7 gether in about 15 minutes. They include aerobatic slope ships with their indestruc­ scrap balsa for beginners to practice gluing tible plastic Duralene fuselages are back in using the instant glues, instructions, and circulation. even nose clay for balancing. There isn’t much need to go over specs EZ Sports Aviation's electric ARF motorgliders, with these sailplanes as so many of you are Continued on page 72 the Lota 1700E. Easy assembly, great flier.

Combat Models PSS offerings A4 Skyhawk, A-10 Thunderbolt II. MIG-23 Dynafllte's new Apogee thermal duration ship hovers above classic Thorn­ Flogger, and F-16 Falcon. Byron Bruce designer and proprietor. burg “Bird of Time." Both are great contest ships.

MAY 1990 13 with aileron problems keep on pushing that stick from side to side in a futile at­ tempt to regain lateral control and never even think of using the left stick. So they often end up with a plane that’s totalled and a transmitter with a severely bent right stick. It’s worth practicing. WHAT’S A BIG BIRD? Everybody seems to have their own ideas about what qualifies a model to be a Big Bird. The International M iniature Aircraft As­ sociation (IMAA) uses wingspan to define what is and what isn’t a Biggie. Any mono­ plane over 80 inches and any bipe over 60 inches can take part in an IMAA Sanc­ tioned Fly-In. The aircraft itself, however, can be anything from the ubiquitous "Stick” to a super-detailed scale model as long as it meets these wingspan minimums. Also, IMAA Fly-In’s are noncompetitive; they are low-pressure, social events—no Judging or trophies allowed. The Quarter Scale Association of Amer­ ica (QSAA), on the other hand, leans toward scale or scale-like models and has no wingspan parameters. They’re happy with any true quarter-scale rendition, re­ gardless of size. Unlike IM AA , QSAA en­ tries are judged and prizes/trophies are awarded. As far as this column is concerned, any flying machine that spans over six feet is okay, although bipes should be some­ where close to 60 inches minimum. Now, some guys feel that every bird, no matter how many wings it has, should beat least 72 inches, while others insist that an absolute minimum of 80 inches is the only way to go. But it seems that size alone is not the only way to determine Big Bird status. Lots The bare bones of a Proctor Albatross DVA. Don't even think about It unless you're an experienced of folks are more concerned about the model builder. It's a NNRF, Nowhere Near Ready to Fly! type of power used than the planes's actual wingspan or size. COORDINATING RUDDER By doing this you can adjust the amount of Some figure that no matter how big it is, WITH AILERONS rudder or aileron at any given time to keep a Big Bird must have some sort of internal ost of our Big Birds look and fly a lot those turns looking good; something you combustion power pulling or pushing it, M better if we learn to coordinate can take pride in. or else it doesn't qualify. These people are rudder and ailerons. There’s another good reason for learn­ willing to lump both two-cycle and four­ It’s true that many of the newer radios ing how to coordinate those two controls. cycle engines together. include a CAR (Coupled Aileron and If you lose aileron authority for any reason, But not the guys who love the thunder­ Rudder) switch/control, but you’ll do bet­ instinctively coding in with the rudder stick ing noise of two-cycle gas burners like the ter if you learn to coordinate both sticks. may very well save your bird. Most guys Sachs, Quadras and Zenoahs. To them this

Ultlmatesport R/C’s Sukhoi SU-26M. An ST-3000 Is recommended for Another Ultlmatesport R /C . . . the Ultimate 10-300. Span 62 Inches, weight power. It’s a 14-pound aerobatic machine. Is 13-15 pounds, and best powered with ST-3000 or equal.

14 MODEL BUILDER

than most digital balances. It is Item No. P96-7384-522, price $39 plus $5 shipping, from Comb, 1405 Xenium Lane N, M in­ neapolis, M N 55441-4494, phone 1-800- 328-0609. I made the pendulum dynamometer from an eight-inch long, two-inch O.D. PVC pipe, a PVC cap for the pipe, and a paint roller! The battery pack serves as the pendulum, the paint roller provides the By MITCH POLING plastic bearings. If the plastic proves to have too much friction, I will replace them with regular ball bearings. The paint roller handle is screwed to a wooden base which I usually use as a m otor test stand. The motor bolts inside the cap, and the motor I built a Prony brake and a pendulum n the December column I asked for battery is held onto the PVC pipe with dynamometer, and both turned out to be information on torque meters so I could Velcro and rubber bands. The battery pack I very simple to build. The sketches show measure electric motor horsepower is the pendulum, which eliminates the drag how. The Prony brake is very simple ... directly. Just after that, Ivan Meek wrote that wires to an outside pack would gener­ about how to build a torsion rod dyna­ just two bolts, two pieces of wood, and a ate. Besides, it eliminates making a pen­ scale, plus a boat-type coupler for the mometer in the November '89 issue of dulum! motor shaft friction surface. The Prony Model Airplane News. Then shortly after The horsepower equation for the Prony that Francis Reynolds, w ho writes the brake presses on a digital scale for the force brake is: measurement. I use a Duncantronic CR- “ Model Design and Technical Stuff” col­ bhp = scale reading (in lbs.) x length of umn for wrote to me and 105 digital scale. I have had this scale for Model Builder, arm (ft.) x rpm x 1/5252. described his pioneering with pendulum nearly a year, and I am very pleased with it. The horsepower equation for the pen­ I recommend it for measuring anything; dynamometers. Meanwhile, I found an dulum dynamometer is: FAA/DOT Aircraft and Powerplant Hand­ from one-gram balsa pieces to four-pound bhp = sine of pendulum deflection book, AC 65-12A, that described the Prony aircraft ready to fly. It will weigh up to 2 (degrees) x pendulum weight (lbs.) x brake. Now I have plenty of information! I kilograms (4.4 lbs.) and w ill do the first pendulum length (ft.) x rpm x 1/5252. would like to thank Francis especially for kilogram (22 lbs.) in one-gram increments. sending much information. Francis may This is better than most digital balances I If you wish watts instead of horsepower, well have been the first to build and use a have seen advertised. It also has a built-in you can multiply the above by 746. Alter­ pendulum dynamometer for model en­ calculator, alarm clock, and gram to ounce natively, you can measure the lengths in gines. He w ill go into the ideas and prin­ converter. Pretty fancy! It is quite compact; cm. (centimeters), the masses in g. (grams), ciples in more detail in his column. 7-1/2 x 6 x 2-1/2 inches, and is priced lower and use 1/97650 instead of 1/5252 to get an answer in watts. I just finished building the dynamometers, so I have no experimental data yet; we’ll save that for another time. This does get us closer to the goal, which is “ Peter Chinn"-type motor evaluations, with real numbers and m otor curves. Then PAINT ROLLER we can look at a motor and know what we have! I reviewed some of the books on electric 2 " PVC PIPE power available in Germany in the April column. Since then I saw the article on Solar Power by Guy Revel in the January Model Builder. This is really a good article, and it inspired me to buy one of the books I mentioned, Solar Modellflug, by Helmut 3 /4 " WOOD SPACER Bruss. This is really a fantastic book, it is very clear that Helmut is both enthusiastic and knowledgeable. If any of you are in­ PROP terested in solar powered models, I

^ / I I 2 " WOOD SCREWS recommend this book. It is in German, but BATTERY PACK Η X is so profusely illustrated that you can learn quite a lot just using a good German dic­ tionary to translate captions. It covers the 1" THICK WOOD advantages and disadvantages of a huge variety of subjects. Some of them are core­ MOTOR less versus conventional motors, ferrite versus cobalt versus boron-neodymium- iron motors, single crystal versus poly­ crystalline solar cells, conventional versus MOTOR BOLTS special airfoils, on-board batteries versus pure solar power, wiring solar panels, three-views of successful solar planes, and on and on. The 114 pages are packed with information. Helmut flies solar planes, so all this inform ation is backed by his per­ sonal experience. There is a list of solar power supplies included, these are Ger­ man, but several are International and FIGURE 2 PENDULUM DYNAMOMETER could supply U.S. customers. The book is available from Verlag fur Technik, Postfach

16 MODEL BUILDER 1128, 7570 Baden-Baden 1, W. Germany. It is DM 25 plus about DM 8 for postage, about $20 total. One of these days I will try solar power. All the planes shown are con­ ventional planform. I think flying wings, such as the Klingberg, would make excel­ lent solar fliers. The Klingberg is excep­ tionally efficient and has no vertical sur­ faces to shade the solar cells. I just purchased another book from VTH Der Akku in Modellbau (Batteries used in Model Building), by Helmut Wolken- Mohlmann. It is a real value at 14.80 ($9). There are lots of schematics for fast charg­ ers, including one that will charge up to 10 cells from 12 volts. The nice thing about this book is that the circuit board layouts are included (for photocopying onto cir­ cuit boards). This really reduces the effort of doing your own. The book is available from VTH at the address given above. ModelI magazine also has an excellent series on electric planes and related topics. I bought two books by Ludwig Retzbach; "Drehzahlregler” (speed controls), and "Akkus und Ladegerate” (Batteries and Chargers). Ludwig clearly knows his sub­ ject, both books are over a hundred pages and profusely illustrated. Like the Solar Power book, you can learn a lot just from illustrations and captions. The speed con­ trol book shows schematics for speed con­ trols that you can build. They range from very simple to quite sophisticated, with optocoupling and the ability to handle 28 cells. The battery book includes schematics ago, and I am still getting requests! I have for those props that stubbornly refuse to for chargers with peak detectors, with the sent about forty of them. Don set up the fold. Thank you, Dave, for pointing this ability to charge up to 24 cells from 12 volts, Seagull as both a seaplane and a wheel out. and temperature sensing. The speed con­ plane. Anyhow, he decided to use the Scott Hartman sent in the first flying re­ trol book is DM 24 (about $15), the battery brake circuit shown in my book, Building port on the Seagull. At 39 ounces his plane oook is DM 2240 (about $14). Other books and Flying Electric Model Airplanes, page will outclimb a lot of the sport electric in this series are: RC Electroflug by Hans- 27. He ran into a snag, the circuit didn’t trainers on the market. ROW is in about 50 Dieter Levine, a classic book revised in make sense. He’s right, the circuit is wrong! feet, and six cells are best, five cells are 1988, DM 29.80 ($18), Modellbau-Electric The book has been out since 1984, and has good only in very flat water. Landing is best Leichtgemnacht (Electric Model Building had a revision and second printing in 1988 done on the natural glide path until a few Made Easy), by Hermann Bock, DM 14.80 and still, somehow, that error got through. feet above the water, where elevator is fed ($9), and Electroflug Muss Nicht Teuer Sein Well, that will keep me humble. The cor­ in gradually until the speed bleeds off. The (Electroflight Doesn’t Have To Be Expen­ rect circuit is shown here. The one shown plane loops and rolls with just rudder and sive), DM 9.80 ($6). Include about DM 8 in the book will run the battery right elevator. Scott is quite pleased with it, and ($5) for postage, Neckar-Verlag GmbH, through the brake resistor, which would has over fifty flights on it. If others who got Postfach 1820, 7730 Villigen-Schwennin- probably burn out the resistor, or cause the tracings have flown their planes, I gen, W. Germany. enough heat to cause a fire. Ouch! If you would be very interested in hearing about One last item about books, then have the book, change the drawing. By the it. I still have some tracings, they are still a enough! Dave Snider wrote to tell me way, the brake resistor can be just a piece dollar! I think I might make one change in about his Seagull. I made an offer to send of wire; that is, no resistor, just a shunt. tracings of the Seagull for $1 over a year That will provide very rapid braking action Continued on page 77

Correction to "Building and Flying Electric Model Airplanes,” page 27. The correct wiring Is shown: motor connects to center terminal of SPOT switch, battery connects to one side, brake resistor to the other side of switch.

MAY 1990 17 Long-time (notice we didn't say “old") very good (riends of the writer, Betty and Carl Cantera, now semi-retired and living on the Chesapeake in Maryland, with their K&B .45 Greenhead powered Smog Hog. Radio was an eight-channel Bramco, with ground-based transmitter operated by the single-stick control hand-held box with connecting cable, hanging on the antenna. Eight-channel meant four controls; one channel for each direction of rudder, elevator, ailerons, and throttle. Note air pump. Back then It was for inflatable tires, not retracts!

“I ain’t got it!” By BILL NORTHROP

ubber Only! Did you see that typo you study any of the plans for vintage of the scale rudder actually moved. R error in the last “ I Ain’t Got It” col­ single-channel, rudder-only models, you’ll OK, are you ready to try a loop, using umn? In closing, we said, “ Come back next note that the rudder area was very small. nothing but rudder control? Get plenty of month (it has now been several months) The “ W AG” featured in the December '89 altitude so you’ll have room to spare. Of and we’ll do some loops and rolls . . . with issue is a good example. Note the extreme­ course, it’s reassuring to know you have rudder-only!” Trouble is, the typesetter ly narrow chord on the rudder. This char­ elevator control if you run into trouble, put in “ rubber” instead of “ rudder.” acteristic came about for two main reasons. but promise yourself not to use it unless all Actually, there is a vague hint of truth to First, as the rudder assumed only three else fails. Remember, it wasn’t there at all that error, in that the rudc/er-only escape­ positions under radio control; full right, in vintage R/C days! ments were almost always rubber pow­ full left, or neutral, the surface had to be For the first try, start with your model ered ! We say “ al most” because there were small or the plane’s reaction to a control pretty well upwind. Make a gentle, wide a few attempts at using electric motor application would have been too violent, 180-degree turn, which will get you powered escapements, but they suffered causing a crash, or an extremely erratic headed straight downwind and, typically, from the same problem that you will en­ flight path. Secondly, as the escapement still climbing at a shallow angle. Leave that counter when trying to simulate escape­ had only the power of a single loop of throttle alone too. Remember, from last ment operation with a modern propor­ wound up 3/16 or 1/4-inch rubber strand, time, we had the throttle adjusted for a 15 tional servo . . . they’re too damn slow! it did not have enough oomph to push a to 20-degree climb, and that’s it ... no When you pushed the signal button on an large control surface against the air load of more adjustment on the throttle . .. we’re old single-channel transmitter, the rudder a moving aircraft! This is the reason that on flying “ rudder-only.” When the model is snapped instantaneously to its full deflec­ old scale R/C models, restricted mostly to about directly in front of you, headed tion ... and returned instantly to neutral high wing cabin monoplanes because of downwind, hit full right or left rudder. As when you released the push button. And the need for inherent stability, the hinge the plane begins to turn and drop its nose, that’s exactly what you needed. line of the vertical fin could not be located keep holding that rudder until the model This brings up another characteristic of in the scale position . . . it was usually has almost completed 180 degrees of turn. escapement-controlled model designs. If moved back so that only about one-third At the appropriate moment... it may take

18 MODEL BUILDER a few tries before you get it right, release the rudder to neutral and pop in an instant of opposite turn to make the model straighten out at exactly 180 degrees and headed upwind. At this point, depending on the type of model, it may be pointed anywhere from straight down to some­ where around a 30 to 45-degree downward angle. Having built up speed in the spiral dive, the increased lift generated will auto­ matically bring the nose up into a climb that may or may not continue until the model pulls over the top, or at least falls over on its back into another d ive . . . your first rudder-only loop. Nobody said they would be perfectly round! If the model pulls up to near vertical, but falls off before completing the loop or fall­ ing over on its back, you may need to help it build up more speed in the spiral dive. This can be accomplished by making the dive longer, even up to a 360 degree spiral (which, of course, would have to be started in an upwind direction in order to pull out into the wind). The main point is to neu­ tralize so the plane will pull out into the The writer with his first published model, about third R/C, one-inch scale Great Lakes Trainer with wind. It may be that the model you are rudder-only control. McCoy .09 engine. For about SO percent of every (light, no radio was used. It using is too light and docile for aerobatics flew big, lazy circles to left. Radio mostly used to guide it back to landing area. Photo taken at ... a true beginner's trainer. If it won’t do tndiantown Gap, PA, 1957 or 1958. this basic stunt, chances are it just isn’t If you’re fortunate enough to have a . . . though it doesn’t look pretty to the flier suitable for the job; you'll have to go to model that requires no more than a 180- who was actually trying to do an axial roll something a little hotter. Some of the really degree spiral dive to build up enough when his aircraft decided to fly around the aerobatic vintage rudder-only models only speed for a respectable rudder-only loop, horizontal line instead of rotating on it! required little more than a 90-degree spiral you're ready to tackle the next basic Mercy! It is so easy to digress! Let’s get dive to build up enough steam for a loop. maneuver, a barrel roll. You can just say back to the rudder-only barrel roll. The But on the other hand, when flown by a “ roll" if you want to, but nowadays, that maneuver begins like most rudder-only beginner, these were too hot to handle expression usually refers to an axial roll, in maneuvers ... with a spiral dive to build and soon got way ahead of the pilot, result­ which the aircraft is supposed to rotate up speed. For simplicity, let’s assume your ing in flyaway or crash loss. around its centerline as it rolls. In a barrel model needs a 180-degree spiral to build roll, the aircraft sort of spirals around an up speed. This time, you head upwind until imaginary horizontal line as it rotates you’re a couple of hundred yards from the through 360 degrees. The barrel roll is really a prettier maneuver than an axial roll Continued on page 80

The writer and his "Torrero,” designed by Willy Smith and published In an early RCM, around 1964-65. Engine was a Clarence Lee .45. Note also twin wheeled nose gear. Basically a Stormer, the Bob Lopshlre designed and drew this logo lor thick wing, with full-depth, notched 1/8 spars, was strong and light. A real good flyer. Our first our "Square Hare" model. Yes, we were “from multi-proportional, using Don Brown's first, grey-box Quadruplex. Tired ol seeing my photos? Delaware" at the time! Come on guys, send in pics!

MAY 1990 19 Schneider Cup Reenactment Director, Bob Martin, second from right, along with officials, examine A Supermarine S5 (two were entered) stands by Bob Heltkamp’s winning 1927 Supermarine SS. Scored 87 out of a possible 100 points maximum. on the beach as a Macchl banks for the Number Scale size was just under one-third, .311. One pylon. SCHNEIDER CUP RACERS at Lake Havasu

By BOB MARTIN ... Reenactment of the famed Schneider Cup competition as told by its creator and director. It could become the R/C scale event of the decade!

s with anything new, or anytime that long to be here, but to all of us who missed A you try something for the first time, the opportunity to see them compete. We there will be the surprises and the disap­ all wish better luck next year! pointments. This applies to Lake Havasu The event was, by most standards, a tre­ for the Schneider Cup Re-Enactment, and mendous success! The number of aircraft to the event itself. entered, twenty-four in all, was far greater The aircraft were, with only a couple of than anticipated. The quality of the aircraft exceptions, beautiful replicas of the best and the proficiency of the pilots also was a seaplanes of their day. To my delight, most surprise for us. We of the "Committee” were detailed beyond the minimum re­ take our hats off to the competitors, who quirements and the way they flew was so were a part of and made this first event realistic that the 5,000 plus spectators such a success, congratulations on a job applauded each flight. extremely well done. If I were to express a disappointment in We must also thank those competitors the aircraft, it would be simply that some of who tolerated the problems that we en­ these great aircraft were unable to finish countered in our first event. We can assure Exactly scale takeoff style of R3C-2 done by pilot the event due to technical problems. A you that we have already taken measures Ken Merrill. Don't believe It? View old films or ask loss, not only to those who endeavored so to insure that those problems will not re- Jimmy Doolittle!

Sploosh! We're guessing, but this may be Bob Heitkamp's S5 not exactly Nitty rig for scooping up and returning stalled aircraft, with Curtiss R3C-Z kissing the surtace of Lake Havasu. on board. Macchl MC 72 awaits clearance.

20 MODEL BUILDER A Gee Bee on floats? It’ll never fly.

Larry Botsforcfs seventh place Supermarine S5 displays the typical line workmanship and magnifi­ cence of all of the Schneider Cup racer models brought to Lake Havasu.

will try to convey to you what happened, watch the event. Our thanks to you girls but when describing the feeling you got if too! you were here, words fail me. Thursday, Nov. 9th For the next five days, mother nature At the crack of dawn, entrants were would offer the contestants and spectators waiting outside of the convention center some of that great Havasu weather we en­ (where the registration, static judging, and joy so often. The cloudless blue sky would safety inspection took place), ready and offer an uncluttered backdrop for some of eager. the most unique racers of all time. The At registration, each entrant was given a W ell... Aw, come onl mornings would be in the high sixty de­ packet with passes, goodies, and a special grees, and by noon the mercury would rise book that outlined and explained each into the eighties, and only a mild breeze step they would go through. Next, each would drift through occasionally. Perfect transmitter was presented for spectrum weather conditions allowed the spectators analyzation by Fred Morgan. Once this to lay back on the grassy incline that led step was complete, each aircraft was in­ down to the beach, some under the shade ternally inspected and then assembled for of the palm and olive trees, while others static judging. This is where things started just soaked up the rays. going wrong. Wednesday, Nov. 8th We had labored long to find, what we Many of the competitors had already believed, to be the most knowledgeable arrived. The excitement was running high, judges of Schneider Cup aircraft. We had and the members of the Desert Hawks confirmation from our English, French, and R/C Club had marked the parking area so two US judges, and a potential Italian Wow, steady as a rock! Seein’ is believin'. Mike that as many RVs could be parked close to judge. What a class act, I thought to myself. Johnson silenced a lot ot hecklers during the the flight line as possible. Late into the One US judge was forced to cancel due to tun-fly portion of the weekend. night RVs rolled into Lake Havasu and the a scheduling change at his employment. Nautical Inn. Roy Slater, from Salinas, CA, We still had three, and possibly four judges, occur next year. who had entered a beautiful Sopwith Tab­ nothing to be concerned about... after So you can plan your vacation, schedule loid, arrived on Tuesday and helped mark all, I had hundreds of other things on my your building time, make reservations or the parking and manufacturers area, and mind. Tuesday night I received a call from whatever, the 1990 event is scheduled for then helped late into the night showing the French judge. He had the flu and could November 2-4. Friday, November 2nd, will late arrivers where to park. Joe Russo and not come. I began to worry, and late Tues­ be for sign-in; November 3rd and 4th will several other members of the Catalina R/C day night I was told that our efforts to get be flight realism; and the awards presen­ Modelers up from Tucson, AZ, came in on the air transportation for the Italian judge tation w ill be late Sunday afternoon. Wednesday night and gave us a hand with had failed, and he would not be here. For those of you who did not have the parking on Wednesday night and through­ Panic began to set i n . . .W hat will I do? It is opportunity to witness this historic first out the event. Their wives took over on Schneider Cup Re-Enactment in the US, I Saturday so that their husbands could Continued on page 104

Ken Bundt's sleek 1931 Supermarine S6-B on a high-speed taxi. It is Ray Young, of local Desert Hawks club, won raffled Stream Eng. Schneider quarter-scale and powered by tandem-twin ST 6000. look-alike. Bob Martin, left Tom Swift, righL

MAY 1990 21 On a runway pock-marked by bomb damage repairs “somewhere in Germany," the author's Ersatz JU-37 Bomber awaits the signal tlare to take oft. Note the special aileron treatment, using Fowler type flap hinges. ERSATZ BOMBER JU-37 By ALEX McLEOD

ere is a might-have-been airplane Juwel (translation Jewel). The miniature H built from a Midwest Twin Stick kit or The Ar.234 wasn’t the only advanced test vehicle was never put into production scratch built from these plans. It’s as stunt- bomber that Germany produced. Back in but superseded by more recent aircraft of able as any pattern design. 1924, when there was a ban on German the 1930s. I wonder if the R/C model was If you have ever been to the Paul E. development of military aircraft, they captured by the U.S. Axis Aircraft Recovery Garber facility at Silver Hill in Maryland, produced proposed bombers in miniature team in 1945 and stored with other flying you will be greatly impressed by the Ger­ and made adaptations from existing mate­ treasures at the Silver Hill facility? man Arado Ar.234.B-2, which they are re­ rials. The Ju-37, Junkers Juwel, was one One of the strangest things is that the storing there. Frank Rabbit, a very in­ such proposed aircraft, would you believe, Ju-37 looks just like a converted Midwest formed guide, impressed upon us the fact built as a radio controlled model for prac­ Twin Stick. These kits, like the Ju-37, are that many German technical advances of tical test purposes. (They even used pro­ not now in production. If you have the W orld War II were far ahead of the Allies, portional radios like ours today.) The Ju-37 Twin Stick kit, then modify it according to but were too late or lacked strategic mate­ was to be the gem in the crown of the the plans. If you don’t, then scratch build rials for large scale production. Luftwaffe bomber fleet. Hence their name the whole thing as shown. I hope you be-

In Canada, you don't always wait for Spring to go flying. If It ain’t snowin' or blowln’, It's flyln’ time. A view of the JU-37 from a three-quarter front angle. It you happen to have a Midwest Twin Stick, you Temperature? What's that? have It made In the shade. K&B Sportster 20's are perfect power.

22 MODEL BUILDER FULL-SIZE PLANS AVAILABLE—SEE PAGE 106

M A Y 1990 Nacelles are square shaped, but Iron) looks like a radiator to allow air In lor One-Inch scale crew drafted from der Vllllams Bros.! Windshield frame is cooling. Engines offset outward for safety. split wire insulation. Machine guns from wood and wire scrap. lieve my story. for the price of a single engine airplane them from two sheets of very firm 1/8 x 4 x This Ersatz (artificial) Bomber was my way and keep the cost of the airplane, including 36 balsa. Use some scrap cut from them to of making the Twin Stick kit look like a engines, below $125.00. extend the sides down as shown at the possible real airplane of the 1920s. The un­ CONSTRUCTION leading edge of the wing. Remember, in a fortunate fact that the kit is not now pro­ If you’re working from the kit be sure to twin the fuselage doesn’t carry as much as duced is really too bad. It is one of the modify it as you go along. The main thing in a single engine aircraft; i.e., motors, nicest flying twins I have ever built, with about it is that the fuselage sides are turned landing gears, etc., so our model doesn’t pattern ship capabilities and single engine upside down, changing it from a high wing need heavy doublers here just what is survival. Ed Rogala, of Midwest, confirmed plane to a low wing one. shown on the plan. Eighth-inch square that production of the kit ceased over three FUSELAGE balsa is used at the edges of the sides both years ago, but gave his blessing to this arti­ Begin with the fuselage sides and cut to increase gluing surface and to allow us to round the corners. Cut out former IB from 1/8 sheet and 3B and 6B from 1/8 lite ply. Glue 3B and 6B, perpendicular to the right side in the indicated place. Then glue the left side to 3B and 6B being sure that the edges of the sides are parallel. )oin the rear of the sheets together at the tail and glue in IB to bring the nose slightly to­ gether. The 3/16 sheet saddles can now be glued in, along with the top and bottom cross pieces and 1/8 sheet at former 2B. It's a good tim e now to install the control rods in the fuselage and support them at every station. They exit the fuselage sides under the stabilizer. Sheet the top of the fuselage with cross-grained medium soft 1/8 sheet and do the same with the bottom rear. Use 1/4 sheet on the bottom of the fuselage in front of the wing. Add the 3/8 sheet nose blocks and triangular stock, then extend the top sheeting over this. You now have the basic fuselage com-

Another angle on engines. Mufflers look like exhaust stacks. Outward thrust keeps plane flying rnntinnorl nn nana 7Ft straight if one engine quits. A good feature for sport twins, and very practical! υ 'Jd” °

cle. If you don’t have a kit, then go right ahead and build the little bomber from scratch, since I’ll describe construction as if it were not a kit. Please do not feel that the fuselage and rudder shapes need to be exactly as in the plan. Change it to suit your taste. Make it a French, Russian, or Japa­ nese, or any obscure looking bomber. Peo­ ple will say “ Oh yeah! I recognize that one from the books, I just can’t remember the exact name.” If you've built any other Ugly Sticks you’ll realize how aerobatic they are. This one is no exception. Even though it looks like it should fly slowly and awkwardly, it doesn’t. It’s truly a “ Ringer.” The K&B Sportster 20s are good, steady, reliable, quiet power, right out of the box. I can't say enough in favor of them; besides, they’re inexpen­ Looking down from the lower onto the Ersatz Bomber. Ailerons reminiscent of Stuka dive bomber. sive. So here is your chance to build a twin

24 MODEL BUILDER ALL ABOUT

ARFSBy ART STEINBERG By ART STEINBERG

Except for wingspan and constant chord wing, Shark-SS is identical to Shark-ST.

aerobatic qualities. As the result of flight testing, the airfoil has modifications that have produced forgiving landing charac­ teristics. Aeromodel (refers to the manu­ facturer, Aeromodel Tampico) planes are constructed from quality medium light balsa, supplied by a U.S. supplier of cut balsa. Only final assembly is necessary, as Completed Aeromodel Tampico ARF sports an ambitious color scheme lifted from the famous the planes are 80% complete. The wing Christen Eagle. must be joined with epoxy in the center, hinges must be installed in all control sur­ his month we focus our attention on a sanded, just waiting to be enveloped in faces, horizontal and vertical stabilizers T most interesting ARF which is pro­ your favorite covering material. For those must be installed and glued with instant duced by our neighbor to the south, who prefer painted models, just go ahead glue. It is also necessary to install the wing Mexico. This conclusion was easy to arrive and apply any finishing technique you like. hold-down bolts, drill for the wing dowel at, since virtually every piece of wood in In my case, I gave it one of my pseudo and install same. Next, the landing gear the airplane was clearly marked "M ade in Christen Eagle Super MonoKote jobs in and motor mount are installed, then the Mexico." I am not aware of any other four different colors. I spent a lot of time fiberglass cowling is cut out to clear motor models imported from Mexico at this time, on this project, because I haven't exercised and installed. Plane is then covered and so this may be a real milestone in the model my MonoKote skills for quite some time, decorated as the buyer desires." industry, and may even be the forerunner and was curious to see if I still had the I found it difficult to believe that the of more products to come. This model is touch. Besides, the outstanding quality of manufacturer referred to the Shark-ST as called the "Shark-ST,” and is a shoulder the construction was richly deserving of an "intermediate trainer,” as it looked like wing airplane with a number of novel fea­ more than a slap-together job. a very hot sport model to me, so I decided tures. In the strictest sense of the term At this point let’s hear some quotes from that this was another case in which the “ ARF” I suppose it has to be classified the manufacturer: "The Shark-SS and ST truth has been stretched a bit in order to otherwise. "Almost Ready To Cover" is prefab aircraft are excellent intermediate sell more models. After all, I’ve seen many really more accurate a description of the trainer and first aileron planes. The 15% so-called "trainers” which turned out to Shark-ST. as it comes fully framed up and symmetrical airfoil gives the planes good be pretty high performance airplanes, so I

Kingsway R/C Hobby Supply, 5559 Richmond St., Houston, TX 77056 Possessing excellent stability, the Shark performs a rock steady, low level Introduced the Shark-ST at the 1989 IMS Atlanta show. fly-by for the camera Shadow at bottom right.

MAY 1990 25 Fuselages undergoing final Inspection before packing and shipping. finally decided to ignore its classification as an intermediate trainer. By the way, the Each Shark fuselage Is hand-built In a jig, assuring straight and true construction. Balsa construction “ Shark-SS" mentioned above refers to an­ leads to easier repairing, if it unfortunately becomes a necessity. other model which is identical to the ST except the wing is 56 inches in span and is square, rather than tapered. It is a bit slower than the ST, with somewhat less neutral stability. The wing halves consist of foam cores fully sheeted with balsa, and after joining them and fiberglassing the center section (fiberglass tape was not supplied), I found the wingspan to be 61 inches with a 10.5- inch chord at the center. The leading edge had a slight taper, ending up with an eight- inch chord at the tip, and the wing area calculates out to about 564 square inches. The balsa was top grade and was hand- sanded to a very smooth finish, and this motivated me to apply an extra deluxe Super MonoKote covering job. Another thing I liked about this airplane was the name, as anything called “ Shark" has to be a slick performer, be it car, boat or plane. Accordingly, I expected my Shark- ST to be a real barn burner of an airplane, so I gave a great deal of thought to the Mexico’s entry Into the ARF field, the Shark-ST, as It comes out of the box. A little less ARF, but a lot Continued on page 81 of qualityl

Business end of this month's ARF, with Rossi .40 and MACS Products Elizabeth King holds a Shark-ST powered by an O.S. .50. Nice looking header. Note heavy gauge fiberglass cowling. model(s)!

26 MODEL BUILDER THE FIRST ANNUAL R/C HELICOPTER CHALLENGE JUNE9 8M 0 ,1990 Champaign, Illinois . demonstration Co-Sponsored by: > p r iz e s AWARDS MODEL# K y a s H O K BUILDER

Champaign County Radio Control Club is Exclusively for 30-size Helicopters! your host with the contest taking place at the club’s flying site. For your enjoyment there will be a chicken dinner at the site location after events on Saturday. All .30-slze helicopters may enter, including but not limited to: Kyosho Concept 30, Kali Enforcer and Baron .20 Miniature Aircraft X-Cell Thirty Series, Hirobo Shuttle, GMP Cricket. Engines limited to: .35 ci or smaller per factory indications on the crankcase, includ­ ing but not limited to: Enya .35 SuperTigre .3 4 ,0.S. .32 at .28, Webra .28. Modifica­ tions are allowed providing the engine was originally .35 cl o r smaller. Classes Include: Novice, Intermediate, Scale, and FAI. Special Notes: • AMA sanction #368 • Must be AMA member to compete • AMA point accumulation enforced • No Hying at this site on channels 44(72.670 mHz) or channels 50(72.790 mHz) due to local paging systems. • Send coupon for pre-registration materials. For a pre-registration package including maps, host hotel information, alternate hotels, res­ taurant details, pre-registratiori forms, and contest materials call (217) 398*2834 or send the coupon below to: Kyosho Heli Challenge Attn: Tim Lampe Great Planes Distributors 2904 Research Road P.O. Box 543 Champaign, IL 61821

□ Yes, I'd like to enter the First Annual Kyosho R/C Helicopter Contributors: Contest. Great Planes Model Distributors Please send me a pre-registration package. Hobby Dynamics Distributors Horizon Distributors □ Yes, I'd like more information. Robbe Model Sport/Schluter Please send me a flyer detailing the Kyosho R/C Helicopter Challenge, including a map.

Name:______

Red Roof Inns, Inc. Address______Your host is Champaign's Red Roof Inn, providing reserved rooms C’O j v t E''O V City:______State:______Zip:______© 1990. Hobbico. Inc. at discounted rates. The 3rd F3C RC HELICOPTER WORLD CHAMPS (CONCLUSION) By JAMES WANG An X-Celi 60 with Quicksilver fiberglass fuselage, YS power, flown by Etraim Kastlel of Israel, who placed 32nd. n this month's chopper column we have thermore, next issue includes our 500 like to pay my respects to the British and the grand finale of our three part series Flights Update on the Concept. We will other teams that received no financial onI the state-of-the-art technology at the concentrate on all the new tune-up ac­ support from their country. For instance, 1989 Helicopter World Championships. cessories for the Concept. We will also the British contestants had to pay their own We have included a table that lists the report to you our flight test results o f Kyo- travel, lodging, and meal costs to attend technical specifications of the models used sho's scale bodies, EZ's Bell 222, and E&C's the W orld Championships held at Chesa­ by all the contestants. Elsewhere in this Airwolf. peake, Virginia. Len M ount of England told issue, we also have a product review of Now, let’s delve into the World Champs me that he spent $5000 to cover this trip for Kalt's new Cyclone II helicopter. Next report. In the December 1989 issue we himself and his wife (his wife was also his month we will talk about helicopter acous­ concentrated on the four American com­ caller). The German, Dutch, and some tic theory. We will explain how rotor noises petitors and their hardwares. In the March other European teams received some sti­ are generated. Next month we will also 1990 issue we focused on the winning pend from their country's R/C modeling look at the new helicopter products re­ Japanese team’s helicopters. In this final organization. (Averaged around $600 to vealed during the International Modeler report, we will emphasize the European $800.) The Americans were fortunate to Show held at Pasadena in January. Fur­ contestants and their models. First, I would get some financial support from AMA. However, the Japanese team members were the luckiest; their budget was com­ pletely covered by radio and model manufacturers. There were 41 contestants at the World Champs. The proficiency among the pilots was not very consistent. Some contestants were just not up to par for world class competition. However, the top twenty contestants were just awesome! As shown in the table, the total score varied from 691.0 points for the first place to a mere 270.5 points fo r the last place. That is a very wide spread! Com pared to F3A R /C airplane aero­ batics, the F3C helicopter competition is still in the em bryonic stage. When R/C airplane pattern com petition was already well established in the early '70s, R/C model helicopter was just being devel­ o p e d . (In fact, the first convincing demonstration of stable helicopter flying was seen by the modeling world at the 7972 World Aerobatic Championships in Doylestown, PA, performed by Dieter

Curtiss Youngblood (left) and Massimo Alta, age 19, of Italy. Massimo flew Two-time European Champion, Ewald Helm, of Germany with his Helm Schluter Champion with Master Fly Jet Ranger. Heaviest model, at 12.3 lbs. Lockheed 286H models, which were lightest at the meet, 9.2 lbs.

28 MODEL BUILDER FLIGHT PROGRAM CLASS F3C RC HELICOPTERS ut· Π

j. »«oe— sta u n w i

Heim Star Ranger with Vario brand tuneup parts, flown by Joop Van Lent, Netherlands. O.S. .61 SFH, JR/Graupner. Beautiful ship. o

j. «sc*ia cucu f t it- '" · ' M ·. aOLLias stall r m

j. iUTOMTATMMO uueiac OCJCttt. «Ο * TWW

Curtiss Youngblood's number one ship, a GMP Legend Elite with GMP Jet Ranger fuselage. He performed beautiful loops and rolls with It. Schluter. wen) Helicopter contests were Cuban Eights, rolling circles, backward winners received almost unlimited free just getting started in the late 70s. The first loops, etc. At present, the maneuvers have support. Otherwise, unless you are in­ F3C helicopter World Championships was to be kept si mple because there are only a dependently wealthy and have time to held in 1985. If you look at the nine com­ handful of master level pilots who can do burn, it's difficult to keep up with the pulsory maneuvers shown here, they are them. Excessively complicated maneuvers dedications put in by the others. For in­ re la tiv e ly sim ple as com pared to F3A w ill only deter average modelers from en­ stance, the seventh place winner, Len maneuvers. In the future, we will probably tering contests. M ount, said that during the three months see the F3C maneuvers becoming more About half of the 1989 contestants were before the show time, he practiced five complicated because our models have directly or indirectly related to the R/C days a week. Each morning he brought improved over the years. Furthermore, the helicopter business. And these people two ships out. He practiced till noon, or top pilots are certainly capable of perform­ were the top placing contestants. For until both models failed. A pipeline supply ing more sophisticated maneuvers, such as example, seven of the top ten winners consecutive loops, consecutive rolls. work in the model business. But all top ten Continued on page 100

Len Mount’s gorgeous Jet Rangers. He molds his own luselage, sells them for $100. Call In England, 01144474323132. Used GMP Legend Elite All of Australian team flew X-Cell 6σβ with Quicksilver fuselage. Wessel mechanics. and Barbuto used Kevlar/flberglass varying airfoil blades.

MAY 1990 29 TAILF

3.757 — — 3.625 MAIN : : 1: 1:35 1:53 1:55 1:5.1 1:4 1:45 1 1 : - 1 : - 1:53 1:43 1: 1:45 1 :4 1: 1 1:5 1 : - 1 : - 1:4 1 : - GC 1 : - 1 : - 1:4 1:25 1:55 1:5.5 1:4.66 1:25 : 1.45: : 1:5: 1:45: — — — — — — : 6EAR RATIO 6EAR U l CD Z UJ 9.7 93 — 9.77 95 95 9.1 9.1 9.697 9.7 9.5 9.375 9 93 9 9 977 95 9 9 95 10 10 10 10 — 10 - 10 - - - - - 10 - — - — “ CC =» CD — — — — - — 1280 1280 1800 1280 1300 1640 1550 1250 1650 1400 (rpm) 1500 1550 1500 1600 1600 1700 1330 1200 1400 1400 1400 1700 1640 1200 1500 1400 1440 1630 1500 1600 1400 1600 1400 1600 * U l ►— SB Igl — - 195 180 — - 185 185 — 175 180 185 195 185 185 — 200 170 175 185 185 190 190 180 187 180 180 170 185 225 200 180 210 186 185 210 140 200 200 235-245 GO B ►— — — — - - - - - — - — - 3.5 3.5 0 3.5 — — — - — 0 0 0 — - - — - 0 0 8 0 3.5 0 0 0 0 0 «t GC £ - — - — — F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. F.G. Wood Wood Wood Wood Wood Wood Wood Wood Wood Wood Wood Wood Kevlar Kevlar MAIN ROTOR BLAOE ROTOR MAIN — — — — - - — — Sym. AIRFOIL Sym. Sym. Sym. Sym. Sym. Sym. Sym. Reflex Reflex Eppler Reflex Reflex Eppler Reflex Semi-S Semi-S Reflex Semi-S Semi-S Semi-S Semi-S Semi-S Semi-S Semi-S Semi-S Semi-S Semi-S Semi-S Semi-S Semi-S Changes Changes o — — — 1 — — — — — — — - — — — — — 224 221 2.44 2.56 1.97 1.89 2.36 2.44 1.89 2.44 2.56 228 2.56 2.56 2.44 2.48 256 256 244 2.56 2.56 2.56 Taper Taper Taper GC UJ UJ < P (In) — - — — 58.0 61.4 61.4 57.0 61.4 58.3 580 60.6 58.0 59.0 58.3 58.0 58.0 58.3 622 59.0 622 58.3 622 57.1 59.0 59.0 57.9 583 59.0 59.8 59.0 58.3 57.1 55.1 55.1 61.4 58.5 61.4 585 56.9 56.9 ROTOR ΗΕΑ0 ROTOR Hirobo—New SSR Hirobo—New OF Black-10 Kalt Elite GMP GMP Elite GMP Standard Heim Elite GMP TSK Pearl III Pearl TSK X-Cell 60 Delta III Delta 60 X-Cell Robbe/Schluter Heim Sitar Schluter 60 X-Cell II OS Kalt Black-1 Heim/West Standard Heim Heim Hirobo-SSR Sitar Kail KSSB Heim Sitar Sitar Sitar Sitar X-Cell Sitar X-Cell X-Cell Schluter X-Cell OF Black-10 Kalt Graupner/Heim II Black-10S Kalt X-Cell Graupner/Heim Vario X-Cell — X-Cell X-Cell s t— UJ 9.2 9.5 9.7 9.9 95 95 9.9 95 9.7 (lb) — 10.6 10.3 10.3 11.4 10.5 10.8 112 10.3 119 10.6 102 115 10.3 11.4 10.9 10.1 12.3 10.6 108 10.8 10.6 10.6 112 10.1 11.7 11.0 10.8 10.3 11.2 10.8 10.8

MODEL IMFG.I MODEL Kalt prototype Magic (Robbe/Schluter)/Magic Ranger (Robbe/Schluter) Ranger (Robbe/Schluter)/Magic Magic SST Eagle (Hirobo)/8lack(Karukawa) Shark Eagle SST (GMP) Ranger (GMP)/Jet Legend Star (TSK) Black (GMP) Ranger (GMP)/Cobra Legend (Graupner) 286h (Heim)/Lockheed Mechanics Heim Long Ranger III Aircraft) (Miniature III Ranger Long (Heim) II Ranger Long (Heim)/P.S. Mechanic Heim (P.S.) Ranger (Heim)/Long Mechanic Heim (O.D.) (Heim)/Wizard Mechanics Heim Sovereign (L&O Models)/Elite (GMP) Models)/Elite (L&O Sovereign (Sitar) Ranger (Sitar)/JET Aircraft) (Miniature III Ranger Long (Schluter) Ranger (Schluter)/Long Champion Heim (Graupner)/Star Ranger (Graupner) Ranger (Graupner)/Star Heim X-Cell 60 Custom (Miniature Aircraft)/(Miniature Custom 60 X-Cell (Kalt) (Kalt)/0mega Professor Omega (Self) Ranger (Heim)/Star Heim Fly) (Master Ranger (Robbe/Schluter)/Long Champion (Mella) Ranger (Robbe)/Star Heim X-Cell 60 Custom (Miniature Aircraft)/ (Miniature Custom 60 X-Cell Heim (Graupner)/Lockheed 286H (Graupner) 286H (Graupner)/Lockheed Heim X-Cell (Miniature AircraftJ/Quicksilver (Miniature Aircraft) (Miniature AircraftJ/Quicksilver (Miniature X-Cell (O.D.) (O.D.)/Leguaan Aircraft)/ (Miniature 60 X-Cell Aircraft) Aircraft)/Quicksilver (Miniature (Miniature X-Cell — (Schluter)/(Schluter) Champion Aircraft) (Miniature L206 Ranger Long (Graupner) 286H (Graupner)/Lockheed Heim Star Ranger (Heim) Star Ranger (Hirobo) (Hirobo)/Nova SST-Eagle (Kalt) Professor Omega (Graupner) Star Ranger (Heim) (Heim)/Lockheed Heim X-Cell 60 (Miniature Aircraft) (Miniature 60 X-Cell Aircraft) (Miniature Custom 60 X-Cell Vario (U. Streich)/Star Ranger (Graupner) Streich)/Star Ranger Vario (U. Aircraft) Aircraft)/Quicksilver (Miniature (Miniature X-Cell Aircraft)/ (Miniature 60 X-Cell Quicksilver (Miniature Aircraft) (Miniature Quicksilver X-Cell 60 (Miniature Aircraft)/ (Miniature 60 X-Cell Aircraft) (Miniature Quicksilver Omega professor (Kalt)/Jet Stream (Kalt) (Kalt)/Jet Stream professor Omega (Kalt) (Kalt)/Jet Stream Omega FR FR FR UK UK HK UK NZ ITA ITA SUI ISR FIN SUI ITA FIN SUI JAP FRG FRG JAP JAP FRG DUT DUT USA USA USA AUT LUX DUT LUX USA ARG AUS AUT AUS AUS KOR SWE S.AF COUNTRY OCCUPATION engineer Futaba Izumi Model Co. Izumi Model engineer Futaba consultant Model manufacturer Model Robbe/Schluter Co. Robbe/Schluter Accountant engineer Mechanical Student engineer Technical Civil engineer AircraftMiniature Co. — Carpenter — Co. Model Robbe — manager Technical manager shop Hobby engineer Electrical — — manager computer Wang distributor Model — — Architect Model sales manager sales Model Service technician Service owner Shop technician Service — manager Technical Student Craftsman dog handler Police — — Accountant Student president Jun Co. INFORMATION & SPECIFICATION CHART OF 1989 R/C HELICOPTER WORLD CHAMPIONSHIP ENTRIES

CONTESTANTS NAME Ewald Heim Ewald Robert Gorbam Robert Yukihiro Dobashi Sensui Kazuyuki Maurice Depigny Maurice Leonard Mount Leonard Graber Daniele Timothy Schoonard Curtis Curtis Youngblood Ishikawa Shizuo Michael Lieu Michael Aita Massimo Rudolf Linder Rudolf Rocchi Massimo Peter Daeppen Peter Bliss Colin Volker Volker Heine Neville Wright Neville Kit Kit Flammang Maldonado Angel Patrick Prange Kari Kari Porokka Palmdahl Christer Jun Park Han Geoff Woodward Geoff Verplanke Kees Efraim Kastiel Gerald Weil Gerald Rose Philippe Barbuto Rob Harald Bingel John Wellington John Mella Paolo Jochen Gerkens Jochen Josef Josef Brennsteiner Dooley Thomas Jyrki Lehtinen Alan Campbell Joop Van Lent Joop Jan Verhagen Wessel John PUCE 1 7 3 5 2 6 8 9 4 19 16 17 18 13 14 15 11 12 10 24 20 22 40 41 36 37 38 39 33 34 35 30 31 32 27 28 29 23 25 26 21

MODEL BUILDER 1450 2705 3865 3715 3645 3610 3540 3090 536.0 5260 481.0 480.0 4740 4710 437.0 434.0 4155 0 382 540 5 540 522.0 4935 550.0 542.0 6090 6010 5 597 589.0 0 576 570.0 5535 5495 TOTAL 6885 615.0 612.5 6115 605.0 691.0 6465 6410 6305 6300 0 0 R 4 780 36.0 111.0 149.5 122.0 1610 150.5 1210 1455 1465 113.0 189.0 1610 1720 1675 1600 198.0 1720 189.0 188.5 198.5 1950 1890 1920 1735 171.0 124.5 203.5 200.5 2075 2285 2110 213.0 231.0 2355 228.5 217.5 2190 216.5 0 R 3 142.5 149.0 117.0 141.0 106.5 132.5 109.0 161.0 152.0 106.0 182.5 166.5 174.0 163.0 164.0 158.0 151.5 1480 147.0 144.5 135.0 191.5 194.5 186.5 179.0 169.5 191.5 199.0 196.5 193.5 202.5 215.0 2075 201.0 2380 228.5 222.0 2070 204.0 207.5 0 SCORES R 2 810 129.5 103.5 1340 110.5 135.5 1110 185.0 1595 169.5 157.5 159.5 166.0 166.5 145.0 173.5 112.0 1185 182.0 187.5 162.5 1745 163.5 189.5 184.0 198.5 195.0 196.0 195.5 193.5 196.0 201.5 2025 222.0 207.5 206.0 205.0 216.0 224.5 216.5 0 1 R — 78.5 995 89.0 69.0 775 1250 0 109 127.5 103.5 0 117 119.0 159.5 1285 0 114 147.0 133.5 173.0 137.5 133.0 1530 121.5 1815 161.5 189.0 191.0 190.5 142.5 177.5 146.0 179.5 186.0 109.5 181.5 194.5 174.0 181.0 2185 209.0 200.0

-

■ - — ■ ■ ■ - ■ ■ — — — — — — — ■ ■ — — — — ■ ■ ■ ■ - — — — ■ ■ ■ ■ - — 3E •r o cc o 3: co - - - — 22 5 N 5 OL CHAMPS WORLD 85 IN ■ ■ - — ■ ■ — — — ■ — — — — ■ ■ — — — — — 33 — ■ ■ ■ ■ — — — — — — — - — — — — — — 16 10 20 29 UJ C=

Morgan/Omega Morgan/Omega Motel Power Cool Morgan Motel Homemade Morgan Power Cool Morgan Morgan Homemade Morgan Homemade — — Omega — MG1000F — Omega — — — — FUEL FUEL MG1000F (%| NITRO L.M Glowbright F700 M6 K&B500H Speed Carbulin Power Cool Carbulynx K&B500 Carbulin Glow RD-Synth — MG1000F K&B500 MG1000F Master Power Speed Carbulin Webra — Ι-UH SN.AJ ] ADJ. SENS. ΙΝ-FUGHT f Y Y Y Y Y N Y Y Y Y Y Y Y Y N Y Y Y N Y Y Y Y Y Y N Y N Y Y Y Y Y Y Y Y N Y Y Y —

Multiplex JR Futaba G-153BB Futaba — JR 120BB JR 120 JR 120BB JR JR 120 JR Futaba G-153BB Futaba Futaba G-153BB Futaba G-152BB Futaba RS700 Robbe RS700 Robbe Robbe Robbe ExpertBB Robbe Robbe/Futaba JR JMW JMW Futaba G-152 Futaba G0153BB Futaba Expert Robbe RS700 Robbe Expert Robbe JMW JR JR JR JR GYRO G-153BB Futaba G-153BB Futaba Graupner 4021 Graupner Custom JMW Expert JMW JR 120BB JR JR SERVOS |

5 5 5 5 5 5 5 5 5 5 5 5 5 6 5 5 6 5 5 5 5 5 6 6 6 5 6 5 5 6 5 5 5 5 5 5 6 5 5 6 — MODE | I I I I I I I I I I I II II II II I I I II II II II II II II III II II II II II II III s III s III — — — — RADIO Multiplex Graupner MC18 Graupner Galaxy8 JR MC18 Graupner Futaba PCM1024H Futaba JR PCM 10 PCM JR GalaxyS JR PCM9 JR Multiplex Multiplex Rex PCM1024H Futaba PCM1024H Futaba Robbe-Futaba — — JR PCM10 JR Futaba PCM1024H Futaba FC28 Futaba Rex CM Robbe PCM1024H Futaba PCM1024H Futaba PCM1024H Futaba PCM1024H Futaba Rex Promars Robbe PCM10 JR Rex CM Robbe 5016H JR MC18 Graupner JR PCM10 JR Computer Apex JR Futaba PCM1024H Futaba Graupner 5016 Graupner Space Webra MC-18 Graupner 10 PCM JR — MC18 Graupner JR Futaba PCM1024H Futaba JR PCM9 JR JR PCM10 JR JR Apex JR JR PCM10 JR MUFFLER MUFFLER (TP=TUNE PIPE] (TP=TUNE K&S (TP) Magna M.A. M.A (TP) Magna M.A (TP) Magna M.A (TP) Magna M.A M.A (TP) Magna (TP) OS M.A. Magna (TP) Magna M.A. (TP) Magna M.A. (TP) Magna M.A. OS (TP) OS M.A. Magna (TP) Magna M.A. Hunner Hatori (TP) Heim (TP) RD EK Hatori Hatori Hunner Hunner M.A (TP) Magna (TS) Damm (TS) Vario — — 924 Schluter Hatori Heim Hatori (TP) Magna M.A. Robbe/Schluter (TP) Hunner (TP) OPS Robbe Hatori K&S OPS (TP) OPS Schluter Hatori V-Tech (TP) V-Tech PLUG GLOW Enya 4 Enya 3 Webra 5 OS 300 OPS Red ST. Enya 5 Enya 5 OS 8 OS Enya 5 Enya 4 Enya 4 Enya 5 Enya 5 Enya 5 Enya 4 Rossi 5 Rossi Rossi 5 Enya 8 OS — Enya 8 OS Rossi 7,8 Rossi 5 Enya 5 Enya 5 Enya Enya 3 Enya 5 Enya OPS 5 Enya Enya 5 Enya Enya 1 Enya 3 Enya Enya 4 Enya 3 Enya 5 Enya Webra Enya 3 Enya 4 Enya ENGINE — OS 61 SFH 61 OS Rossi SF-H 61 OS SF 61 OS SFN-H 61 OS ABC VF 61 OS SF 61 OS OPS Picco OS 61 SFN 61 OS ABC SFN 61 OS — YS ABC 61 Webra VF 61 OS OS 61 ABC SF 61 OS Webra 61 YS FSH 60 YS ABC 61 Speed Webra OPS FS 60 YS FRH 60 YS YS Ring SFN 61 OS Ring SFH 61 OS SFN 61 OS RHM 61 Speed Webra YS60FS IV LF X 60 Enya 60 Rossi 60 YS 61 Speed Webra Ring 61 Speed Webra OS 61 SFN-H 61 OS 0S61ST-H 0S61SFN YS61SH ABC R 61 Speed Webra ABC FSR 61 OS AUTO­ 7 35 ROTATION 12 12 11 -4 -5 -4 -4 to +10 -5 to +16 -5 to +12 — — -6 to +12 -4 -6 to +12 -4 to +10 12 — — — — — — — -3 to +12 11 -4 to +12 -7 to +15 13 — — -4 -4 -5 to +12 10 -5 — — — — — — — — 11 -4 12 15 12 — — 3 3 to +5 3 t o +9 0 0 to +7 0 0 to +85 6 6 to +8 2 to +8 6 6 to +9 -4 -4 to +8 -4 to +8 -4 to +9 -5 to +11 - — — — -2 to — +9 — -7 to — +8 -2 to +8 -2 to +8 -4 -4 to +8 -4 to +10 -2 to +9 -3 to +9 — — AEROBATIC — — — — — — — -5 to +9 -3 to +7 -3 to +8 -7 to +8 -3 to +85 -35 to +8 -6 to +9 -2 to +8 -2 to +10 -4 to +9 -5 to +9 — — — — — — -2 to +8 PITCH SETTINGS PITCH HOVER 3 3 to +1 0 0 to +9 3 to +4 45 2 2 to +2 0 to +8 4 to +5 4 4 to +5 2 2 to +5 6 6 to +9 4 to +5 4 to +8 -2 to +7.7 -2 to +9 — — -1 -1 to +7 — — — — -3 to +9 -2 to +7 — — -3 to +5 -2 to +10 -5 to +8 -4 to +10 -1 to +5 -15 to +85 — — — — — — — — — -5 to +10 -1 to +9 — -1 — to +55 -25 to -13 -25 to M2 -3 to +11 -2 to +6 — — -6 to *9 N. Wright N. P. Prange P. J. J. Lehtinen K. Flammang K. A. Campbell A Maldonado E E Kastiel Porokka K. Palmdahl C. H Jun Park K. Verplanke K. R. Barbuto R. Bingel H. M. M. Alta Metla P. Rose P. M. M. Rocchi M. Lieu D. Graber D. J. J. Wessel Woodward G. G. Weil G. P. Daeppen P. Bliss C. Linder R. V. Heine V. M. Depigny E. Heim E. L. Mount C. Youngblood C. Gorham R. CONTESTANT Sensui K. J. Van J. Lent Van J. Verhagen J. J. Wellington J. J. Gerkens J J Brennsteiner T Dooley S. Ishikawa S. Y. Y. Dobashi T. Schoonard T.

M A Y 1990 1. SAM 100 display booth at the Central Penna. Model Association Flea 2. Very active SAM 100 club at shopping mall exhibition. Plenty of mem­ Market. Great way to get club exposure. Sorry, no names. bership interest here. See text (or club member names.

possible. Photo No. 2 shows the type of exposure we are referring to as no less than seven O.T. models can be seen in this group shot of SAM 100 at the Lebanon Mall late in winter 1989. Seen in the photo are Bob Bennethom, Paul Ahnert, Harry Albright, Ray P rim aldi, Jack C onrad, John Dela- grange, and Rudy Liebeskind. A live bunch! inally! We have some reports on East mounts, plans, you name it. SAM 100 put on a humdinger of a meet FCoast activities from John Delagrange This is something more SAM Chapters on N ovem ber 12 called “ The 1989 O ld- and his SAM 100 cohorts. We are pleased on the West Coast should get involved in. Timers Convention.” Sixty people showed, to feature photos and write-ups of Old About the only real display we have out of which 27 signed up in five different Timer models and modeler activity in the here is the SAM booth at the International events. east, something we have been unable to Modeler Show at Pasadena, California. This As John D. points out, the list of different do with any degree of regularity in this is great for recruiting new members, show­ old time aircraft was incredible. One column. ing models, and exchanging ideas and in­ doesn’t need to enter the meet; simply One of the main drawbacks to East Coast formation. Of course, there are several walk around and observe the beautiful activity is the severe winter weather, MECA Collectogethers but they don’t at­ models. Best of all, talk to the expert SAM something we on the West Coast do not tract all that many fliers, being staged fliers. Fliers came from SAM Chapters 12, see very much. Regardless, the snowbound mainly for engine collectors. 36, 76, 66, 15, and 100. Great turnout! boys still have a considerable amount of SAM 21 has participated in shopping Paul Ahnert took the photos, so let's wintertime activity in the form of indoor mall shows, but this sort of thing is quite continue with the coverage. Photo No. 3 flying, trade shows, etc. rare. In light of the number of Old Timer shows Charlie Thuet running up his Ander­ Photo No. 1 shows what we are talking contests (17 R/C annuals and majors, six son Spitfire mounted in a Miss Delaware II, about; seen here is the SAM 100 booth at two-day F/F annuals and a host of singles) an improved version of Steve Kowalik’s the Giant Central Pennsylvania Model it is not surprising that tim e is lacking. original Miss Delaware. Charlie placed Association Flea Market, held at the Leba­ However, it is this writer's viewpoint that fourth in com bined Class ABC fuel allot­ non, Pennsylvania Fairgrounds. Seen is many clubs looking for exposure and new ment (glow and ignition combined) with a Dick Bozzard and Bob Gennethum III members would do well to participate in respectable time of 937 seconds. hawking model magazines, engine mall shows and trade shows wherever He may not get into too many photos.

3. Miss Delaware II by Charlie Thuet. One of Steve Kowalick’s last designs. 4. Bill Brenchley releases Skip William’s Rambler. ST 29 engine. Looks a Yep, It’s an ignition engine. mite chilly there!

32 MODEL BUILDER 5. Bob Bennethom holds last rights lor his Quaker Flash, formerly high wing. Pager did it!

6. Len Fox launches 1/2A Playboy. Love those 1/2A Texaco R/C models! but the reader should recognize Bill Brenchly in Photo No. 4 letting go of Skip fully doled out to the most competent and who had enough capitalization to promote Williams’ S.T. 29 powered Rambler. Skip winning modelers. This careful approach and manufacture two follow-on engines, also took third in 1/2A Texaco. Brenchly assured the success of the engine in w in­ the Cannon 300and 350for Classes Band C flew but without much luck. Bill will be the ning the events entered. in free flight. Associate Contest Director for the SAM Before one gets the idea the engines Meanwhile, Delong and Steele started R/C O.T. events to be held in conjunction were simply given away, Delong and Steele up separate enterprises with Delong mar­ with the NFFS Champs at Lawrenceville, "loaned” engines to hand picked con­ keting the highly successful Delong .30 us­ Illinois during the week of October 16-20. testants. These fliers were instructed to re­ ing the same practice as before the war, i.e. Photo No. 5 is a rather sad one showing port back on possible flaws and improve­ handing out the best performing Delong what can happen to a Quaker Flash when a ments along with comparisons to the com­ .30 engines to the experts who promptly “ pager” gets you from an adjoining chan­ petition. On this basis, D&S engines were started setting records. This system works nel. Bob Bennethom holds his hat over his quite successful, as the manufacturers were well to start with, but those purchasing the heart. This is getting to be a serious prob­ extremely careful to test and run all en­ "garden variety” of Delong engines found lem as the pagers, 10 KHz away, have gines under the best conditions available them wanting when raced against the enough power to overflow into our ad­ to them. competition, such as Torpedo and McCoy. jacent channels. From the successful D&S engine, the Bob Steele continued (as before W WII) (No plug intended, but maybe the best Cannon engine was produced with the to produce engines on a semi-custom idea is to build a receiver much on the line claim that the D&S engine was its pre­ basis. The Steele RB Special was quite simi­ of the pager receiver being sold by Shel­ decessor. Although it has not been con­ lar to the D&S; however, Steele felt that a don's FHobbies. This appears to be the best firm ed, it appears that Delong and Steele rear timer location would allow for a defense against extraneous signals.) sold their rights to the Cannon people, cleaner run and unfouled timer points. To wrap up the report on the very active SAM 100 club, Photo No. 6 shows that once a free flighter, always a free flighter. Note the perfect launch by Len Fox of his 1/2A Texaco Playboy. Takes experience to get off smooth launches like that! ENGINE OF THE MONTH Once again, we are indebted to Bob McClelland, that indefatigable secretary- treasurer of the Model Engine Collectors Association (MECA). Although some of his engines have been held by this writer for close to a year, there has not been one word of complaint. Getting on with this month’s subject, the D&S .29 is probably the best known racing engine of 1940, yet very few modelers have ever seen one. The D&S (from Joe Delong and Bob Steele) was first produced with the intention of winning the Nationals events in 1940. These engines were care­

MAY 1990 33 9. A fourteen (Good Grief!) foot Powerhouse being built by Mark Glam- 8. A reduced Dennyplane by George Noreen, Portland, Oregon, from Dan mier, South Dakota. Flight scheduled for spring. Lutz plans in MB.

Some modelers will note the Cannon utilized a side intake rather than the up­ draft shown. Careful inspection will show the D&S engine front plate updraft venturi arrangement had mounting holes ar­ ranged in a square pattern that would allow the intake to be placed in any of four de­ sired positions. (Of course, porting would have to be changed on the crankshaft.) D&S engines were made up of rough aluminum castings looking somewhat crude and showing file work to clean up the rough exterior. However, the interior was something else with excellent machine workmanship. The D&S engine featured a stroke of .675 inches and a bore of .750, giving a dis­ placement of .295. As mentioned before, the crankcase, head, and front plate were sand cast aluminum. A steel sleeve was fitted to the cylinder and a mehanite piston lapped to the sleeve. Other items were a two piece crankshaft with a pressed-in crankpin, a steel wrist pin, sand cast brass conrod.and a timer resemblingthe prewar model. 11. Leon Nodolskl and his Bob Toft "Snuffy VI” (we published plans). Leon encountered unusual BELATED ACKNOWLEDGEMENTS fuselage twisting problem discussed in text. Answers needed! There were so many items to cover at the recent SAM Champs at lean, Nevada, that the Champs newsletter was seemingly taken for granted. No such thing! This at­ tempt to revive the "Daily Blurb” put out in the 1940 Nationals was an excellent one. Ned Nevels of SAM 27 should be given the kudos for excellent coverage. Don Bekins brought the word processor and Ned did the work. As a matter of fact, he was so dedicated to his task that he was not able to fly in the events. Instead, Ned, after organizing the paper, would drive to Las Vegas every day to get the material published. Furthermore, this was strictly Ned’s idea and as such, he paid for all costs incurred in printing, driving, distribution, etc. What a terrific guy! This really helped to make the 1989 SAM Champs a great success! CAN YOU STILL SEE IT? 10. Impeccable Kowalik “Miss Arpiem" by Phil McCary. Ohlsson 29 power. Construction article and There has been a lot of controversy over plans published in MB.

34 MODEL BUILDER 12. Electric powered Miss Delaware by Marc Bird, Oceanside, CA. Could 13. Another clean and neat electric O.T., a Simplex, by Dave Hicks, Wash- be scaled down, we're not sure. Clean and neat. ingtonville, NY.

what color is the best for high flying Texaco The 48-inch model was built to plans As Mark sez, "Although it may appear to models. This writer uses models with white appearing in Model Builder, as designed be just another Powerhouse in the bones, as the predominant color in opposition to by Danny Lutz. The Dennyplane Jr. was the it has been doubled in size to 14 feet. Built Jim Kyncy and his SAM 30 cohorts who first successful commercially produced it last winter but covering was another insist that black is the best for visibility. model that was available on the West problem in finances. I discovered if I used The "Index of Visibility” chart included Coast. Reginald Denny did a terrific job of transparent MonoKote the cost would be with this month’s column has been kicking promoting model aviation, to the point of over $180.00 even with discount prices. around the various club newsletters; getting movie studios to use model planes Finally settled on Sig Koverall. hence, this writer feels some national in their aviation sequences. "The model is built from balsa, spruce, recognition is appropriate. Dennyplane models flew fine, but as a and Lite-Ply (with plenty of lightening The chart was originally published by duration model, left a little to be desired. holes). The model with engine, radio, and the Marshalltown Flyers, and is based on What most modelers fail to recognize to­ landing gear came in at 12 lb., 9 oz. The studies made by several government agen­ day is that at that time, almost all contests in finished model will approach 20 pounds cies. Of particular note is that all U.S. Air the Los Angeles area were “ precision” type giving a wing loading of 10 oz./sq. ft. Force trainer type aircraft are painted contests. In this type of meet, the models "I didn’t build the Powerhouse 200 for luminous orange with white trim or strip­ were judged for appearance and flight char­ competition, but rather as a show, promo­ ing to identify pilots undergoing flight acteristics consisting of takeoff, climb-out, tion, and public demonstration model. training. According to the chart, these are flight pattern, glide, and landing. Before Plenty of wing area; anyone want to rent the top visibility colors! No more argu­ anyone says this type of contest would billboard space?” ments, fellows! never catch on, consider the record of the RARE ONES SAM 39 Southern California Gas Model Association Maybe this columnist should entitle this Bucky Walter of SAM 39 has been quite which never had a contest that had less section, “ Have You Seen This Item Lately?” faithful in submitting photos of that club's than 250 contestants. as we feature several little-known Old activities. Before Chet Lanzo’s death, Jim Eventually, Dennyplanes were distrib­ Timer designs. Deals built a Lanzo Racer as soon as the uted all over the country and became ex­ One of the main features of this column plans were available. Jim selected a Mag­ tremely popular. As a matter of fact, the is to acquaint the average modeler with num 120 four-cycle engine, which flies the late Ray Van de Walker was employed by the looks, performance, and general ar­ 2216sq. in.,10pound Racer very smoothly. Walt Billet, a Minneapolis hobby dealer, to rangement of little-known designs. Such is Unfortunately the engine is not legal for build complete ready-to-fly Dennyplanes the case of Photo No. 10, sent in by Phil SAM R/C events. fo r $100.00. Seems cheap now but a hun­ McCary, showing a design by Steve Kowa- Regardless, it is simply great to see a dred dollars was a m onth’s pay or better in lik called the Miss Arpiem. fellow build a model for his own enjoy­ those days! The name was derived from the news­ ment. Enjoy Photo No. 7! SAM 46 letter put out by Junior Motors (Brown Jr. ANOTHER “FUN” MODEL Mark Glamier writes to send photos of engines) with the title of "Arpiem” (RPM, In that same line, Photo No. 8 comes his king-sized Powerhouse. Of the three tricky huh?). Of course, the design fea­ from the Great Northwest showing a scale- photos sent, we have selected Photo No. 9 tured an upright exposed Brown Jr. engine. downed Dennyplane Jr. built by George as most representative of the workman- Phil has gone the original design one Noreen of Portland, Oregon. better with an O&R .29 engine inverted with a slick cowl and landing gear fairings. All-up weight is 30 ounces, which should make the model climb well. Model is silk covered. Phil reports the model literally flew off the drawing board with two de­ ' I»·" . ' . V *- f ■: · grees of down and right thrust. ANOTHER “ UNUSUAL” R.J. “ M ik” Mikkelson continues to send in photos taken at the various SCIF meets held at Taft. Presented is Photo No. 11 of Leon Nadolski and his O.S. .15 converted ignition powered “ Snuffy VI,” a design by Bob Toft, well-known midwest rubber speed and duration man. The Snuffy design appears on paper to have everything going for it: a high, stable pylon, neatly faired octagonal fuselage, and Comet Sailplane type wing. On half power the model flies excellently, but at full power the model will climb steeply 14. A big Flske Hanley 1937 Texaco Winner by Al Wolsky, Hemet, CA. Flies great one Webra.61 on and as it goes into a spiral climb the fuse­ ignition. lage twists to the point that the stabilizer is

MAY 1990 35 90 degrees to the wing. Wow! This was particularly noticeable in this w riter’s scaled Madewell .49 powered ver­ sion. Attempts to stiffen the fuselage met with repeated failures. First, the fuselage was double tissued with a cross-grain ar­ rangement, then internal diagonal cross bracing, then double silk covering—all to no avail. In talks with midwest modelers, some indicate that designer Bob Toft sheeted the fuselage. This has not been the answer. Truly a shame as this model has tremen­ dous flying potential. Perhaps the readers out there have discovered a way to make the fuselage twistproof. From personal ob­ servations, it appears to be an inherent design flaw. We solicit your opinions. RUBBER NOTES This column is so heavily oriented to gas powered models, we sometimes forget that rubber power model competition has experienced an amazing rennaissance. En­ tries have doubled and tripled in most all The SAM 86 newsletter, as edited by Al depending on the source, varies from 3780 events. Wale, provides a good insight on this new to 3687 (Che Hobbies); FAI Model Supply This has been b ro u g h t about by the product. We quote as follows: gives figures of 3614 ft.-lbs./lb., while the availability of good rubber. The FAI rubber “ The currently available tan rubber has Joe Eisen Pirelli measured 3690 ft.-lbs./lb. that has been marketed by Ed Dolby of FAI excellent energy. Samples measured yield over a four-box average. Model Supply has been excellent. Ed has figures of 3597 and 3710 ft.-lbs./lb. of "From the foregoing figures, FAI Tan recently brought out "tan” rubber which energy. The gray-black 1/8-inch FAI (1987 rubber is as good as any. Comparing torque appears to be the best yet for power and and 1988 batches) averaged 3520 ft.-lbs./lb. duration. over six different boxes. Pirelli rubber, Continued on page 83

% INDEX OF VISIBILITY (Each color has been tested equally under sunny, 100 overcast, twilight, and foggy light conditions.) 90 MARSHALLTOWN FLYERS Garry Brandenburg, Editor 80 01 Albion, IA 50005 Ed. Note: We expect a lo t o f experienced high- 70 O altitude competition fliers are going to take ex­ 2 ception to these results. So w ill the poor timers! 60 < cc 50 O UJ 2 40 03 Q z> 2 3 ill —I £ 111 CO ω O LU 30 O be: 2 •x. CO CC 20 m o C5 3 CO co < 10 3 < < -I o Q Q CO Ω 0

BOB ROMEISER'S OLD TIMER Model of the Month CRUSADER Drawing and Text by JOHN BLAIR irst published in the October 1940 issue Fof Air Trails magazine, this medium­ sized rubber powered endurance model, Romeiser’s “ Crusader,” flies very well. In Old Timer competition it just qualifies as a "Small Cabin,” and can hold its own against the Jabberwocks and Miss Canada Seniors. Our semi-regular contributor from Warne, North Carolina, John Blair, drew these plans and speaks from personal experience about its performance. John did a little legal beefing in certain areas, all indicated on the plan, that should result in a more reliable model. It certainly couldn’t be any more basic or simple to build. ·

36 MODEL BUILDER FULL SIZE AVAILABLEPLANS - 106 PAGE SEE

M A Y 1990 ONAIRYoshioka 1 7 0 0 E By BILL FORREY Parts layout for installation of Astro FAI 05, six-turn cobalt motor. Extra ply spacer moves motor back to close oversize gap between thrust washer and nose of plane. The repair would restore the model to design: add 4.5 plus4.7 plus 3.0 divided by flight in all probability, but the model’s three equals 4.06. beauty would be compromised. AREA II: Quality of the kit, 4.1 average. As I said earlier, the blow-molded plastic First detail, precision. The parts fit is ex­ nose section is attached by four small black cellent, and the quality of the materials is screws in the front bulkhead. This bulk­ likewise excellent. It is a very well executed head is about 1/4 inch wide, and is made ARF airplane. Everything worked. For pre­ from a sandwich of two pieces of three-ply cision, I give it a perfect 5.0. light plywood. A very large hole has been Second detail, ease of assembly. In gen­ cut in this bulkhead, in a rough, nose- eral, the ONAIR 1700E was not difficult to down or sideways landing, I suspect that assemble. There are areas that I feel could the nose will rip loose from this bulkhead. be better, however. This problem is further aggravated by the For a model called an ARF, I feel too possibility that the non-folding prop will much time is consumed cutting plastic Wrap prop adaptor shaft tightly with masking catch on some obstacle, and with the fuselage parts and tail parts. This is a tricky tape to make snug fit with standard size hole in strength of its lever-arm, tweek the nose job which can be easily botched. The main prop. off or bend the motor shaft. In all fairness fuselage has cooling holes which must be can be used. This would include a radio to Yoshioka, my initial testing has not in­ cut out, then routed open. The nose sec­ such as Futaba Conquest 4-channel FM cluded such abuse, and this problem has tion is a blow-molded piece of plastic simi­ Glider radio with its R114H mini receiver, not been observed. lar to a fuel tank. Two sides must be re­ S133 micro servos, 275 mAH Ni-Cds, and The elevator hinge is formed by the moved, two NASA intake ducts opened, a mini switch. Airtronics mini FM receiver outer white plastic skins of the top and hole opened for the front of the motor, six with 501 Microlites, or the JR Propo micro bottom surfaces coming together and holes drilled using a model knife or electric servos would also work. touching along the hinge line, forming a drill, and two of these holes need to be I installed a slightly older Conquest completely sealed, “ living hinge.” This beveled to accept flat head screws. 4-channel A M Glider radio with Futaba plastic hinge is very stiff, even after the If it slips, a hand held hobby knife can be R4H mini receiver and S33 micro servos. recommended break-in flexing. This stiff­ dangerous and/or yield sloppy work. In The S33’s fit the factory die cut servo tray ness gives the S33 elevator servo a real cutting these pieces of plastic, I can see with only a slight sanding of the rectangular workout at full deflection. The net effect is potential trouble for some modelers. Plas­ tray opening. increased drain on the receiver battery and tic cutting is better handled by the factory Because the S33 servos stick up very high increased wear on the servo gears. How­ than by the modeler in my opinion. above the servo tray, care MUST be taken ever, in all fairness, it does work. Only one very minor cutting error was that the pushrod clevises attach to the Structurally, based on my predictions of made during my ONAIR’s assembly. It in­ servo arms at the inner or next-to-inner failure in the hands of a beginner, or as a volved the incorrect placement (by 5 mm) arm holes as drawn in the instructions, but result of accidental abuse, I would have to of the radio’s on/off switch. give the ONAIR a middle of the road 3.0. One drawback to the ONAIR’s fuselage To sum up Area I, the quality of the design is that only micro radio equipment Continued on page 84

Whole assemblage from another angle. Note hole in cowl bottom to access Completed installation. Note how spinner blends into fuselage. Prop is 8x6 Allen wrench to tighten set screw In prop adaptor. Robbe. A Graupner folder would also work well.

38 MODEL BUILDER PRODUCTS IN USE AIRTRONICS “VANGUARD” PCM & PPM FM HELI RADIOS By JAMES WANG Aliironics new Vanguard 6-channel PCM radio being tested in a flybarless GMP Legend.

The Airtronics Vanguard helicopter Both the traditional PPM and the newer etc., to be added to modern radios. How­ T radios are the newest inexpensive PCM are considered as digital technology ever, in terms of reliability, both PCM and helicopter radios to appear on the market. because they convert the analog voltage PPM radios are proven methods of coding The Vanguard six-channel helicopter from the control stick pots to digital pulses. pilot’s command signals. radios come in two forms, a PCM version Thus, all modern aircraft radios are called Editor’s Notes: and a traditional PPM version. Both are six digital proportional radios. It is how the Though the author’s comments regard­ channels and use FM (frequency modula­ pulses are coded that makes them dif­ ing encoding are basically correct as being tion) for transmission in the air. Before we ferent. commonly accepted in R/C, they are not review the radios, let’s first go over the PCM has various advantages, the chief exactly correct according to electronic differences between internal coding in of which is the ease with which error cor­ engineering practices. We would like to PCM or PPM, and the transmission formats, recting codes and various special char­ quote Fred Mark’s writing in his excellent A M or FM. People often get confused be­ acteristics of the message source may be book on the subject of R/C systems. tween coding and transmission. exploited. For example, many modern "In order to avoid a possible misunder­ PCM and PPM only refer to how the music synthesizers also use PCM tech­ standing, you should know from the outset joystick commands are coded. PPM means nology. Like the new sampling keyboards, that our model R/C digital proportional pulse position modulation. In PPM, as the once a speech wave has been converted systems are not true digital systems as that pilot moves the control stick, the width of into a sequence of digits by sampling and phrase is used in electronic engineering. the respective pulse will change accord­ quantifying, it loses its identity as a speech In electronic engineering, digital systems ingly. PCM means pulse coded modulation wave. Strings of digits from many different are most often used to transmit analog and it was introduced to R/C about seven sources—other sampled sound sources, data (usually a human voice) in which the years ago. For PCM, each position of the music ... can be flexibly interleaved to amplitude of a control voltage (a reflection control stick gives a unique number, let's modify the original speech wave. Com­ of the amplitude of the voice) determines say between 1 and 1024. Thus, center stick puters also operate in digital format, hence the time period between succeeding means 512, full right stick means 1024, and the PCM coding method gives rise to our pulses. Decoding is easy because a re- full left stick means 1. This implies between modern programmable radios. PCM per­ full left and full right stick, you can only mits more imaginative functions, such as have 1024 different servo movements. failsafe and hold-last-command, mixing, Continued on page 92

The Vanguard PCM and FM transmitters look Identical and have same Under tront cover are the helicopter functions. Here the 6H FM transmitter helicopter features. Shown In Airtronics double Xmltter case. Is shown. The PCM has failsafe In addition.

Complete Vanguard Installation, Including 1991 narrow-band receiver. Special through-the-frame exhaust header designed by James, made by The very new and Inexpensive Airtronics SG-X gyro comes with Its own MACS. special 94103 servo. Very compact and light weight.

MAY 1990 39 Professional model builder Craig Wilson's beautiful "Aggressor II." JET TRAILS atthe Tangerine Ducted Fan Fly-In By WALLY ZOBER he Remote Control Association of planning? Gun” event. Dave organized this ducted T Central Florida held its third annual This two-day fly-in was held at the De­ fan fly-in as follows: On-site registration Tangerine Ducted Fan Fly-In on December land Golden Hawks flying field. The flying began at 8:00 a.m. on both days. Flying 31, 1989 and January 1, 1990. We have a site is an abandoned concrete runway at started at 8:30 a.m. and continued until rather unique situation here. You will note the Deland County Airport—perfect for 4:30 p.m. The speed traps were open from that the first day of the fly-in was the last R/C jet models. The contest director was 10:00 a.m. until 3:00 p.m. The Top-Gun competitive ducted fan event for 1989 and Dave Tyson and he kept the show rolling competition ran from 12:00 noon to 2:00 that the second day was the first ducted fan with at least three or four airplanes in the p.m. on both days and two rounds were event for 1990. How’s that for timing and air at all times, except during the “ Top- flown each day.

Greg Gameau, down from Canada, was a participant In the Top-Gun Jerry Caudle won award I or fastest flight with his very pretty “Viper," event Shown with his super flying “Aggressor." clocking 212.5 mph.

40 MODEL BUILDER Dave Nicholson's modified Byron Mlg-15. Uses BVM fan, duct, and KBV Bob Florenze (left) was test pilot for first flight of Paul Lupia's giant Byron engine. Files about 20 percent faster with this system. F-15. Paul's smile tells you how it turned out.

cross sect ion of R/Cjet models at this fly-in. Bob Violett Models was well repre­ sented at this meet with Vipers, Sport Sharks, Aggressors, and his F-86 Sabre. Yellow Aircraft had several A-4 Skyhawks, an F-5E, and their newly released F-4 Phan­ tom. Bob Fiorenze flew and demonstrated a few of the Yellow Aircraft models. There was also a Byron F-15and a modified Byron MiG-15, a Nick Ziroli designed Heinkel Fle-162 (modified from the Midwest kit), and last but not least, a prototype F-20. The craftsmanship and the flying skills of the contestants was top drawer. There were no ugly or poorly built models at this ducted fan fly-in, nor were there any pilots who were unskilled or unqualified to fly these super, machines and yet, unfortunately, there were a few crashes. I’ll talk about them later. I’m not one for dropping cliches, but Bob Florenze with his new F-4 Phantom built after watching this two-day event, I have from Yellow Aircraft kit. Uses a single fan. three appropriate ones for you: "Triumph The weather was really great both days. and Tragedy,” “ Agony and Ecstasy,” or, as Terry Nltsch, Top-Gun winner tor '89/’90, show­ Sunday, December 31st was b rig h t and they say on Long Island where I lived be­ ing bottom side ol his modified "Viper.” Check­ sunny, but a little windy. Monday, January fore I moved to Florida, "You win some ers, anyone? 1st, was partly cloudy with a slight breeze. and you lose some." was done to excite the spectators. Top Both days were great for flying. The Deland Ducted fan pilots fly their high-tech, pilots such as Terry Nitsch, Bob Fiorenze, flying site was ideal for this competitive high-performance machines to the leading Jerry Caudle, Bob Violett, Dave Ribbe, and event. There was plenty of room for spec­ edge—there is no room for mistakes. If Dave Escobar, to name a few, push their jet tator parking and lots of room for contes­ you do it right, you win—it’s triumph, it’s models to the edge of their flying en­ tants in the pit area. A large tent was set up ecstasy. If you make a mistake—it’s tragedy, velope. for the food concession stands. There were it’s agony and you lose. There was some twenty-four registered contestants and really great and aggressive flying. Some of thirty-two airplanes. There was a good it was in the Top-Gun event, and some of it Continued on page 86

Dave Nicholson's Nick Ziroli designed Heinkel HE-162 unfortunately no Bob Violett’s F-86 Sabre. Equipped with gyro on rudder to help tracking. longer kitted by Midwest. Modified to use BVM fan equipment and KBV Has sequential operating landing gear doors. Also jettisons its auxiliary engine, It flies fast and with authority. fuel tanks, for additional realism.

MAY 1990 41 PRODUCTS IN USE

The author’s Kalt Cyclone II test ship with pleasing paint |ob by Ray St. Onge. With OS 50H, It moves right along, does loops and rolls. At designer rotor speed ol 1400 rpm control response Is smooth, not quick enough lor hot-dogging. KALT “CYCLONE II7JR MAX 5H FM HELICOPTER HELI R/C SYSTEM By JAMES WANG

or the past few months I have been duction. Kalt is one of the leading R/C O f all the helicopter manufacturers, Kalt F testing a new R/C helicopter, the Kalt chopper manufacturers in Japan. Kalt and Schluter have the best reputation for Cyclone II. It is a 50-size helicopter aimed started in the mid-'70s with its successful consistent quality control and kits without at the beginner market. It is a follow-up to Baron series. Kalt products were intro­ missing parts. Aside from the specific the earlier successful Kalt Cyclone I design. duced to the U.S. in the late 70s by Circus model designs, Kalt and Schluter metal The new Cyclone II was released in 1989. FJobbies, and are now distributed by parts are always well machined. The plastic The improvements include a completely Hobby Dynamics. Unfortunately, most parts are molded cleanly and fit together new K-5 main rotor head, toothed belt- Americans have not been familiar with Kalt well. During the past 15 years, Kalt has drive tail rotor, autorotation bearing,and a models because until now, before you introduced more main rotor head designs new canopy design. In this review we will could only get replacement parts through than any other company. Kalt pioneered first look at the Cyclone II's design integ­ mail from Circus Hobbies. Thus, very few the hinge less main rotor head for R/C rity, then control setup, and finally the fly­ people flew Kalt models. Last year. Hobby helicopters, and was also the first to have a ing qualities. We will also talk about the Dynamics started distributing Kalt heli­ gas engine powered helicopter kit. Kalt’s new, inexpensive, JR MAX 5H FM radio. copters and parts to local hobby shops. lineup once included a 60-size R/C auto­ For readers who may not be familiar Recently, we began to see more Kalt heli­ gyro. Their old clear-lacquered wood with Kalt products, here is a brief intro­ copters at the fields. blades were once the best stock blades.

T h l· Is what greets you as you pull the top half of the foam case off the JR And this is what you find when you (carefully) spill out the contents of the MAX 5H FM hell radio system. Neat, huh? Kalt Cyclone II kit box. Numbered bags for parts identification.

42 MODEL BUILDER PRODUCTS IN U$E

Front servo Is pitch cyclic, middle Is roll cyclic, rear Is collective. Beautifully machined swash- plate. Above It Is swashplate follower and collec­ machine for beginners to experts). That is a Install engine, clutch and fan: 1 hour tive mixer. diverse selection of models to satisfy any Assemble the tail rotor gearbox: 1 hour Kalt models have always been popular in palate. Furthermore, these are all sleek Attach landing gear, tail boom, and fins: the Far East and Europe. If Hobby Dynamics looking, cutting-edge designs. The old 1 hour maintains a strong campaign on Kalt, and Baron series is being phased out. Stay Add servo tray: 1 hour staffs knowledgeable helicopter techni­ tuned, as we will have the Excalibur and Add control linkages: 1.5 hours cians who know the models and the parts Enforcer reviews coming in a few months. Smooth out the collect!ve mechanism: 1 numbering system, then you can expect to Now we shall look at the Cyclone II. As hour see more and more Kalt machines in U.S. shown in the picture, the parts are pack­ Install radio system and gyro: 1 hour in the future. The present lineup of Kalt aged in nine plastic bags to match the nine Finish the rotor blades and painting : 1 machines in the U.S. includes: Omega Jet assembly steps in the instruction manual. hour Stream (a Jet Ranger look-alike for experts, The manual is geared for minimal assembly Check over the control setup: 1 hour also winner of the 1985 World Champs, time because there are only about 50 words The Cyclone II is almost entirely put to­ $1499); Omega Professor (the pod-and- on each page, and each page has large gether from injection molded plastic parts. boom version, also for experts, $1299); illustrations. It took me 11 working hours Aside from the main rotor blades, there Excalibur (pod-and-boom, for intermedi­ from opening the box to flying. aren’t any wood pieces. The side frames, ates to experts, $999); Cyclone II (pod- Clue the canopy: 1/2 hour servo tray, tail fins, tail rotor blades, landing and-boom for beginners, $539); and a new Assemble the frames: 1 hour struts, tail rotor gearbox, and even the main 30-size Enforcer (general purpose fun

Left sideframe removed to reveal engine, cooling shroud, main gear, and clutch. Starting belt can get Jammed In flywheel. Square cut-out for gyro, but It should go In cabin or model will be tail- The K-S rotor head. Above the 3mm nut you can see the teetering pin and brass bushing. See text heavy. Sliding mixer shown has some play that needs Improvement

MAY 1990 43 PRODUCTS IN USE

Tall rotor drive belt Is picked up right below white main gear. This ellml- Very effective centrifugal clutch design. Steel pins between hub and 4mm nates extra tall drive pickup pinion gear. Above main gear, to left, is 90° bolt. For shoes to swing outward, sufficient force Is needed to counteract crank lor collective pitch control. Good place for two bearings. pin's spring-like force. Its performance Is very good. rotor head, are all plastic. However, these vibrate loose spontaneously. Cyclone uses cooling shroud will not accommodate a molded parts mated perfectly. There are 3mm bolts and self-locking locknuts as on 60-size engine with heatsink head. You will no sharp edges. the more expensive metal helicopters. The then have to cut and modify the shroud. If The basic frames, and servo setup of added advantage of molded fuselage you want a 60-size helicopter, then buy a Cyclone II is identical to Cyclone I. The frames is that they include recessed hexa­ 60-size helicopter. The Cyclone is sup­ two molded side frames are very robust. gon wells for the locknuts to sit in. Thus, posed to be a docile beginner helicopter, The two frames alone weigh a total of 19 you don’t need a hex wrench when tight­ not a rocketship. By the way, a 40 or 45 ounces. I have not crashed my Cyclone ening the 3mm bolt with an Allen driver. engine will give sluggish performance. yet, but I suspect these two molded side As the frames are molded quit well, once Hence, we recommend only the OS 50 frames can take some abuse. M y first worry the engine, main rotor shaft, and main FSRH, Enya 50H, or the Webra Speed 50H. was that if the frames alone were over one gear are installed, you will automatically The centrifugal clutch on the Cyclone II pound, then the final helicopter must be get perfect gear mesh. is one of the most effective that we have quite heavy. Surprisingly, the final weight The engine mount which comes with seen. The picture shows its unique design. came out around 8.5 pounds. To help re­ the kit is pre-drilled for an OS 50 FSRH, or Unlike most other models which use a duce the overall weight and prevent tail Enya 50. Hobby Dynamics (the U.S. im­ one-piece design, Cyclone uses an inter­ heaviness, the tailboom is a fiberglass tube porter of Kalt helicopters) also sells an op­ esting steel pin design. The steel pin holds instead of aluminum, as used by most other tional 60-size engine mount. However, we the clutch shoe in until the centrifugal helicopters. believe that a 50 should be used with this force can throw the shoe out. So far, the Most plastic helicopters use 3mm bolts helicopter. With an OS 50, our Cyclone clutch has worked extremely well. A good and plain 3mm nuts, or self-tapping screws climbed out very happily, but definitely clutch means the main rotor blade will not for holding the frames together. The prob­ not like a rocket. A 60 may overpower it lem is that the plain nuts or screws can and cause fatigue stress. Furthermore, the Continued on page 106

Tall rotor blade grips supported on two radial Hell radio with five servos and an electric gyro are needed to fly the Cyclone. Large fuel tank gives bearings. Careful assembly of tall rotor gearbox 20-mlnute flights. Plastic landing struts toughest author has seen. Robust servo tray. assures smooth tail rotor control.

44 MODEL BUILDER s s i s q i x j

FAI style competition class High performance K-5 rotor head Autorotation New cone start system Precision tail drive assembly

Push-pull control assemblies Weighted rotor blades

Excalibur inset advanced mechanics

E n fo rc e r in s e t revolutionary m o d u la r ■ Sealed transmission with d esig n . planetary drive gear assembly ■ Modular design • Top cone starter (NFOKEi • Quality balanced rotor blades

Bell-Hiller mixing Autorotation Balanced rotor blades Tooth belt tail drive Easy to build High performance K-5 rotor head

Cyclone II inse t super-strong liber-remlorced sideframes.

Have a Name Location Time Telephone question MauiChai Orem, Utah 7-9P M C S T (801)226-4286 about a Kalt Frank Dykes Laurel, MS 7-9P M C S T (601)428-1716

Hell? Call an Mike Ellis Sevierville, TN 7-9P M C S T (615) 453-6324 expert on the Hobby Rich Goss Remsenburg, NY 6-10P M E S T (516) 3254)265 Dynamics GaryKurtzman Phoenix, AZ Alter 6 PM MST (602)582-8604 Helicopter Billy Pearce Enterprise, AL 5-10P M C S T (205)347-4973

Hotline! ' no colled calls please *

Available at hobby stores everywhere.

Distributed by Hobby Dynamics Distributors · P.0. Box 3726 · Champaign, IL 61826-3726 · Phone 1-217-355-0022

M A Y 1990 45 BOB VIOLETT MODELS’ F-86F SABRE By DAVE MALCHIONE

he world is full of classics—classic cars. lett’s design goal was to engineer the T Classic Coke—but whatever hap­ model with exact scale intake and exhaust pened to the classic jets in the ducted fan areas, and still be able to deliver grass field industry? One jet that has the right to claim performance. Many experienced jet mod­ this title is the F-86 Sabre. Having seen elers regard Bob's goals as unachievable. combat from Taiwan to Argentina and Not so—the F-86 is exact scale and flies like from Pakistan to Korea, the Sabre has been a dream. exceeded in its widespread use only by the There are some unique features that set T-33, T-6, and the Dakota. In all, thirty-nine this kit apart from all the others. The use of nations have operated the F-86 to protect highly engineered injection molded car­ their countries. bon fiber accessories make construction of Bob Violett Models has been working this kit quick and easy. The kit comes com­ on a correct scale outline Sabre for seven plete with a Kevlar reinforced epoxyglass years and it has proven to be a winner. If fuselage and a separate molded hatch. you are looking for a scale single engine jet Ready-to-install ducting system and pro­ model that is large enough to see, stable in fessionally cut and notched foam cores for flight, and completely engineered, my the wing and fin are included. The hori­ opinion is that this F-86 is your best choice. zontal stab is airfoil shaped from balsa. My F-86 was the first production kit to Special injection molded fittings include be built and flown per the plans and de­ the wing and stab mountings, hatch and The Gottschall sisters, Klmber and Heather, West tailed instructions, with no modifications cowl attachments, and shock absorbing Chester, PA, help us with a striking top view ot needed. Daves BVM F-86. The Violett F-86 is an appraisal of a new generation of true scale jet modeling. Vio-

The Vlojett fan is double suspended in rubber An outstanding feature of the BVM Sabre are the scale Inlet and tail pipe openings. No “cheater" mounts, for many good reasons. holes required to gulp sufficient air for proper operation.

46 MODEL BUILDER PRODUCTS IN U$E THE INSIDE STORY o f I BOB VIOLETT MODELS JET KITS Kadi accessory Is designed 10 facilitate the ^ , model assembly and equipment installation. # / These special parts arc all injection molded # / from carbon fiber nylon to be light and strong,/

νΤΛΗΐι i /.k k m o u n t im ; h k a i k i i ADJUSTABLE SI Of u n m e t n m mb* b m a m t m n MOUNT SU V O TRAYS

HAH II M K .SSU SI PINs m* RECEPTACLES

**· COW1. KEEPERS " · *' BLTAI* LM.IM U T U i ” ΙΙΑΤΓΜ -u*llw.tumilll OFF-SET HINGIS m>b k a l i οπχατιο·· F-86F SABRF JET

iavaham· ur>B«m «| BOB V IO LE TT MODELS,

I4VAHAM I WMATT111 WINNER O F THE I W SCALE MOTION TRANSFER ARMS AND MANY OTHER SCALE O r ti u m n tt:m * cycling n n a u

H E X PLATES — ~ r MOUNTS TO ATTACH Β» Μ ΒΓΤΪΑΙΤΛ TO lABBU·!

Fl.l'SII W I N C \ | ONLY BVM M ANVFM rUM iS JE T KITS THIS COM PlJTTt SERVO MOUNTS Μ>· ItAT AM» AIL*BOM wjrvm

The canopy and equipment hatch are both molded as one unit. No need to Stab dihedral mounting bracket and epars tor correct scale angle, hack out a hatch with an electric hand tool. landing gear mounts. finished skins. Ailerons and flaps are then of this kit. This feature cuts down on the A clear canopy, decals, pre-joined and cut out of the wings and the assemblies set high frequency vibration related to ducted shaped wing skins, and a complete hard­ aside for finishing. fan operation, resulting in longer radio and ware package make this jet kit a real value The fuselage assembly is quick, starting servo life. Lower DB levels also have been for your modeling dollars. The best part of with the canopy/equipment hatch attach­ established with this mounting system. This this package is that after you have invested ment. Carbon fiber injection molded hatch mounting system sounds very complex, your time and money you will have a 100% pins and latch make this an easy, light, and but in reality is easier to install and remove contest ready model. Any questions about very secure system. After the hatch is than the conventional four-bolt hard assembly or fan operation were met with complete, the pre-cut glass laminated mount system. prom pt and competent advice. This is nice formers are installed and the double rub­ All pre-cut glass laminated formers are to have when you are undertaking any ber mounted Viojett fan is installed. This installed in their proper locations. Carbon sophisticated modeling project. All up­ highly engineered mounting system is one fiber stab mounting brackets are installed, dates and modifications to the kit are sent example of the thought and completeness making the preset dihedral simple and very at no extra cost to the customer. Assembly starts with the stabilizer and Magnacore wing preparation. The hori­ zontal stab is solid balsa shaped to an airfoil section with a carbon fiber leading and trailing edge, an injection molded dihedral brace, and carbon spar. The vertical fin is foam sheeted with balsa for light weight. The Magnacore wing construction is simple, strong, and light. It features shock absorbing landing gear mounts that allow the model to survive a really hard crash landing without damage. First, all of the carbon spars, gear mounting plates, and servo bays are installed in the wing, then Inlet liner is wrapped with carbon cord to resist pressure drop created by fan. BVM employs the cores are sheeted with the beautifully extensive use of carbon fiber tor lightweight reinforcing of components.

MAY 1990 47 Three- step photos showing retract operation. In full down position, wheel doors are closed. During retraction, wheel doors open. Note nose gear rotating 90 degrees tor llat storage ol wheel. In final stage, gear Is sucked up and doors are closed, all set (or a smooth, belly landing. What are we saying!! Just kidding, Bob!

Vlojett, external mixture control, and plenty ot room tor radio equipment Note engine glow plug peeping through outlet tube. strong. This one item saves countless hours with the injection molded CF spar joiners. of determining the correct scale stabilizer This process takes about fifteen minutes. dihedral angle and is accomplished in The wing is then joined to the fuselage minutes. using the molded wing mounting brackets The next assembly step is the prepara­ and rear mounting pins and bushings. One tion for wing mounting. First, using Zap-A- Saddle-bag tuel cells and molded wing mounts. Cap, the wing halves are joined together Continued on page 88 Space left over!

Canopy, decals, and molded cockpit Included In kit. Are you drooling, Bob Transfer arms, door hinges, and all linkages are supplied In kit. A place for Veasey? everything, and everything In Its place!

48 MODEL BUILDER MODEL DESIGN & TECHNICAL STUFF By FRANCIS REYNOLDS

REYNOLDS NUMBER nolds Number a number of times in this Most aerodynamics books talk about D&TS is in receipt of a letter from column, but now realize that I have never Reynolds number, and so do the ency­ Jim Adams, the President of The gotten into explaining this bit of "Technical clopedias. Quoting the Britannica, "Os­ M Society of Antique Modelers (SAM). In Stuff.”his What better person for the job than borne Reynolds, a British physicist, first letter, Jim asked for a little elucidation on another guy named Reynolds? Let me showed (1883) that the transition fro m Reynolds Number. I have referred to Rey­ share part of my letter to Jim with you. laminar to turbulent flow in a pipe depends upon the value of a mathematical quantity equal to the average velocity of flow, times the diameter of the tube, times the mass density of the fluid, divided by its absolute viscosity. This mathematical quantity, a pure number without dimensions, became known as the Reynolds number and was subsequently applied to other types of flow . . (etc.). As you can see, uncle Osborne form u­ lated his concept with hydraulics in mind, tw enty years before the airplane was in ­ vented. It is still used extensively in hy­ draulics, but the new science of aero­ dynamics also found it to be indispensable. Reynolds number (R.N., or sometimes just R.) is still the same as Reynolds form u­ lated it, except that in aeronautics we use the chord of a wing instead of the diameter of a pipe, and the fluid we are talking about is air, not water. Whatever the fluid, if the R.N. for two flows is the same, the Figure 2 flows are geometrically similar. Note that the chord of a tapered wing varies, so the Reynolds number will be higher at the wing root than it is at the tip. R. N. is density times velocity times chord divided by viscosity, or (rho)(V)(L)/mu, where L is the "length” of the chord. The density and viscosity of the air don’t change much for our models, which usually fly near sea level, so we normally don’t worry about rho and mu. What we do have left to worry about, therefore, are the speed and the size of the airplane. Remember, the flows are similar if the R.N. is the same for both. This says that if one scale airplane is twice as big as another model of the same airplane, but is only flying half as fast, their R.N. is the same and therefore both have laminar flow or both have turbulent flow. The lift and drag co­ efficients on the two models will be the same. This illustrates a problem in connection The author’s homemade tool removes tight servo plugs from receivers without putting a strain on the lead wires. Easily made from a cheap pair of tweezers. Continued _ on page 97 „

MAY 1990 49 they occur. Good question! No, they don’t come at you like Morse Code at fifty words per minute, but actually more like a chime clock striking the hour, with more than J[|'3 3 ^ 3 jrf 3 £ adequate spacing between each beep for an accurate count. Actually, I have found that like so many other parts of R/C flying, time keeping with this device rapidly be­ ;3 :3 ·> ·ι»< ■*«« comes automatic, and while it accurately paces you, it does so w ithout a lot of con­ THE ELECTRONICS INDEX too receive a double listing, so that you can scious effort on your part. For example, if IS COMPLETED! locate that elusive electronic do-funny by my last actual count was five minutes, I know that the next time it sounds it is inally! In my communications with its name if you forgot w ho makes it. In indicating six minutes, w ithout my actually some of you, I have mentioned that I addition to the subject heading, also in­ F having to think beep/one, beep/two, had plans to update the Model Builder cluded are the issue by month and year, beep/etc. I have found too that it is a lot electronics index which I started some page number, and author, so that you can more comforting to have this close a count years ago. As any of you w ho have ever easily spot what your favorite writer had to of your flying time than depending on just attempted this type of a project know, this say on any particular subject. one tone to tell you when all of your al­ is far from being an easy or enjoyable I am sure glad to get this done, and have lotted time has passed. Info on the D&B chore, and I kept putting it off in lieu of vowed strongly to myself that from now on timer is avilable from D&B Electronics, P.O. other more interesting pursuits. Well, I am I will update it every year with the appear­ Box 27727, Santa Ana, CA 92799. happy to say that I finally ran out of excuses, ance of the December issue. Time will tell! The R/C Equipment Certified Listing in and the seventeen year (1973 to 1989, in ­ In the meantime, for those of you who Model Aviation magazine has been a clusive) index of all electronics subjects to have expressed an interest in the index source of confusion to some who are ap­ appear in now actually when I got it finished (Thanks for not saying Model Builder parently not reading what is actually being exists. Some 21 single-spaced pages! if!), copies are available for $8, postpaid, said, or NOT understanding what it does The idea of the index is to help me not all crunched up but unfolded in a large say. It does not, repeat not, say anything answer my correspondence, which as too envelope, directly from me at the address about this being a listing of AMA approved many of you have found out, sometimes at the end of the column. * * * R/C equipment. It says only that the mak­ lags unforgivably. Though it generally takes ers or importers of this equipment have me only a couple of minutes to pound out The D&B timer which I mentioned here filed a letter with AMA to the effect that an answer, researching for that answer is a couple of columns ago (January, with the band width of said equipment has been often a real time killer. And while I know photo in February) brought in a few letters tested by an independent laboratory and that I repeat myself at times in this column, on the subject of timers, most of which agree strongly with the advisability of never found to meet the specified narrow band I try to keep it to a minim um or at least not requirements. Some questions do exist in to do so unless enough time has gone by taking your eyes off your airplane—while it’s flying, at least! One letter did point out the program, such as what constitutes a so that the information will go to a reason­ "registered professional test laboratory," able number of new readers. a fact that I apparently glossed over, the rate at which this tim er informs you of the as specified to do the testing? Who regi­ The MB Electronics Index covers not sters them, and does anyone verify their only my efforts, but also those of every elapsed time. For those of you who missed qualifications? However, the intent of the other person who has written on a related it, the D&B tim er starts counting at your program bears a lot of merit, and I trust subject or product during that time. It is flick of the switch, normally at takeoff time. that AMA will maintain and uphold it. also broken down by actual subject, i.e., One minute later, it beeps at you once to The program has raised a lot of questions you won’t find any listings for Electronics indicate the passage of one minute. An­ because of the omission of some well- Corner—every subject discussed during a other minute later, it goes beep-beep to known names from the list, with the obvi­ given month will be listed individually. In let you know two minutes total have ous ready assumption that the equipment instances where a cross reference is called elapsed—up to fifteen minutes at which simply does not meet the required stan­ for, it is so listed: Reversing Servo Oper­ time, if you are still flying, it recycles and dards. The 1991 deadline is almost with us, ating D irection and Servos, Reversing starts over. six months or so from when you will be Operating Direction. Products discussed What was questioned, or rather criti­ reading this, and some clubs are already or reported on are listed under the manu­ cized because the writer doubted his abil­ looking ahead to the expected chaos when facturer’s name if well known, if not they ity to count the beeps, is the rate at which these questionable transmitters are oper­ ated with 20 KHz spacing. We are hearing some strong talk from certain clubs about

777 i M W - Θ Battery * Under f ~ Charge Θ 1 0 _ I

Circuit used to match any given charger to any battery ol lower voltage. With the connections made to the charger, battery, and ammeter, the value ol the resistor is adjusted to the desired The big, heavy-duty, high power MS-747WB servo (just think ot Boeing's “Jumbo Jet") available current value. Increasing the resistance will de­ from J.C. Development. Note physical size next to 9-volt transistor battery. See text. crease the current and vice versa.

SO MODEL BUILDER banning certain types and brands of your correspondence. charger at 500 mA. I want to charge a 12v equipment at their fields, clubs asking local Years ago, the model industry was com­ pack of ten Sub C cells with that charger, dealers not to stock certain questionable posed almost exclusively of those with but I thought a 12v pack should be charged equipment to keep it out of the hands of personal experience in the hobby. Such is at 13.5V. Can I use this charger or not? beginners, even about class action suits not the case anymore. The industry is large "Also, can a wall transformer (power and other types of vigilante actions. W ith­ enough to have attracted those who are supply or battery eliminator) of the correct out the equipment with which to verify the only chasing the buck. While I understand milliamp rating be used as a battery charg­ cited specifications of any R/C equipment, the need for a business to make a profit, I er? Aren’t they all the same thing?” I cannot and will not offer any opinion on feel better with those companies that seem Larry signs himself as a "Confused Cow­ this particular subject. However, as a to have some concern about me as other boy” —we’ll see if we can un-confuse him. number of my airplanes started their life as than just another pocket to pick, and I will The subject is confusing enough by its lines on a piece of paper and later as plugs steer clear of those that can’t or won't con­ nature, often aided more than a little by for fiberglass molds, 1 do not care to trust firm to the recommended standards. To­ the maker’s somewhat cavalier methods of them to questionable R/C equipment and gether, we have a much greater chance of marking these items. Taking last things first, understand perfectly why others can feel making a difference. In the meantime, our the difference between the similar appear­ the same. best protection is to buy that equipment ing battery charger and power supply/bat- Since in my mind the main objective of which meets all recommended specs from tery eliminator is often a matter of filtering "Electronic Corner” has been a place to companies that are cooperating fully with and/or voltage regulation added to the share thoughts and ideas, I would like to the established programs. basic transformer and rectifier circuit. Also, hear from any of you who would care to * * * we sometimes find one or the other expound on this subject. I have some in­ Batteries and chargers are always a popu­ marked specifically for its application with formation on hand, club newsletters and lar subject, and it seems every mpnth some companion electronic partner. They such, which express other thoughts and brings questions different enough to war­ are interchangeable in some respects, but actions on the subject, which I will be rant answering here instead of individually. not in others—depending on the appli­ happy to share with any of you who would Such is a letter from Larry Mitschke, of cation. like to know what is already being done Houston, in my home state of Texas, who To review, the common R/C equipment and contemplated. SASE please! If you do wrote: charger usually consists of a transformer write in on the subject, and would like to "I bought a 12V gel cell from Tower picked to supply the voltage necessary to receive pertinent information from other Hobbies, and the charger it came with puts sources in return, please mention that in out 19V as l measure it. It says it is a 12v Continued on page 89

Basic NiCd charger circuits discussed in text. W ith some physical variations, every non-automatic charger used is based on this circuitry.

MAY 1990 51 WALT MOONEY’S

By W A L T MO O N EY. . . This is a model of Walt Mooney’s own aircraft. He owned two of them (at different times). See color photo on page 6 of this issue. Photos here, as usual, by Fudo Takagi.

he Piper Vagabond was originally con­ controls, minimum instrumentation, and a was one of the first ones photographed. A T ceived because of the slump in sales of single door. The shorter span wings al­ three-view of 4121H was published some Piper Aircraft, as well as all other general lowed shorter struts and the shorter struts years ago and this was blown up to 16 inch aviation aircraft in the late 1940s. The J-3 eliminated the need for jury struts. Landing span for this model to give a scale design Cub was being over shadowed by side-by- gear shock absorbers were eliminated in that meets the "Embryo” rules as well. The side airplanes such as the Luscombe Silvair favor of a rigid system that depended on model, and all the Vagabonds built, is over- and the Cessna 120. So a low cost side by the tires for whatever shock absorption all CUB YELLOW. The trim color was side Trainer was designed. The design used was required. As a consequence of the TRAINER BLUE, a rather dark metallic blue. existing "C ub” parts where possible and decrease in size and the simplifications, as There really wasn’t much trim. Only the was simplified and reduced in size for faster compared to the )-3 Cub, the cruising top cowl inside of the windshield, the production and increased performance. speed increased from about 65 mph to registration numbers, and the “ Vagabond” The wing span was reduced to 29 feet, about 85 mph. sign on the fin. There was no fuselage trim the length was shortened because it was Piper eventually produced more than stripe at first because, "stripes cost no longer a tandem-seater, and as origi­ seven hundred of these short-winged too—much!" according to the president nally produced it had only a single set of birds. N4121H was the fourth one built and of Piper at the time. What inspired this model? First, the Scale Staffel model club scheduled a "larger than Peanut" indoor contest, a quick building, good flyer was needed and I happen to own the real N4121H! The plans are exact scale as far as I can determined and the model was built to the plans. There are deviations from exact scale in view of common model building tech­ niques. For instance, the wing is made as a single piece of structure, rather than as a separate left and right wing, and is set on top of the fuselage. A slight bump at the trailing edge where it sits on the fuselage is the only apparent difference, and the model wing is lighter, stronger, and a lot easier to install. Model structure is similar but not exact scale. Half the number of wing ribs were used, although all were shown on the three-view and are conse­ Although this Is the last original article by Walt to be published, we will continue to publish quently indicated on the plan. A slightly centerspread rubber models, even repeating some ol Walt’s from time to time. thinner than scale airfoil is used to avoid a

52 MODEL BUILDER

own country. One of Mr. Harada's models is in the Aerospace Museum, and one of Mr. Sugimoto's is in a Texas model exhibit. Among those who assisted them during their sightseeing were Walt Mooney, Ray Crowell, Bill Noonan, Bob and Sandy Peck, Doreen Virtue, Paul Gauci, Joan Hannan, and yours truly. It was a pleasure meeting these gentlemen, and we look forward to seeing more examples of their ingenuity! We feel privileged to be in contact with model builders in so many parts of the world. In spite of language differences and geographical distances, one soon learns that we are all kindred spirits, sharing in common the joys and pleasures of our hobby. THOUGHT FOR THE DAY On that note we’d like to share the New Year’s wish sent in by the editor of the Australian model magazine, Airborne: "For comfort, just enough of wealth; For all thy life, the best of health." MODELS IN THE MEDIA Kazuchiro Suzuki, of Japan, with his successful Kiyoshl Minam’s Peanut model of the Fabre Both Herb Weiss and Vern Clements rubber-powered Northrop N9M flying wing. Hydravian, both photos taken by Taku Hamada. sent us copies of the Forbes magazine arti­ cle about the Lake Havasu City, Arizona, contest for model Schneider Cup racers. While it may seem surprising that a finan- cial-oriented publication should devote coverage to model airplanes, consider two factors: First, Malcolm Forbes himself may be the greatest advocate of hobbies living today, with avid interests in hot-air bal­ looning, motorcycling, and miniatures col­ lecting. Second, some of the models flown at Lake Havasu were definitely in the upper strata from a financial standpoint, costing from $17,000 to $24,000! The article, entitled "D oolittle’s Dis­ ciples," appeared in the December 25th edition, covered two and a third pages, and was illustrated with five full-color photographs. Quite comprehensive in its coverage, the story even mentioned Jeff Waldrop’s magnificent contest posters, Klause Jorg Hammerschmidts red, white, and blue blimp Is propelled by one of Stefan Gasparin’s some of which were autographed by diminutive CO 2 engines. Jimmy Doolittle himself. HOW’S THAT AGAIN? Charles Beecher, of Phelps, Wisconsin, writing of the research efforts required in preparation for constructing his own scale model: " I’m working from scratch, and don't even have a good itch yet." IMAGE PROBLEM? Sir Lionel Cheetwell takes exception to the "boys who didn’t grow up" opinion some people have of model builders: “ I have never heard an aging (amateur) musi­ cian described as juvenile because of his lifelong interest in music. Model airplane building and flying have something in common with music: the initial activity is relatively simple but can progress through infinite variety and complexity, creating a lifetime of interest and enjoyment. And, both activities require a modicum of in­ tellectual ability.” Amen! SPIRIT SPINNER On a historical note, the original pro­ peller spinner from the Spirit of St. Louis has recently been donated to the National Air and Space Museum of the Smithsonian Institution, by the Bowlus family. The spin- Two scale models by Skip Ruff; his son, and his R/C Stlpa Capronl electric powered "ducted fan." The 70-Inch span model should be flying by now. Look out Top-Gun! Continued on page 91

MAY 1990 57 By BOB STALICK

One of the vagaries in the AMA char­ tered club listing, however, seems to be the large number of clubs that are listed as MU (multiple interest). As I looked over the clubs listed as MU, I noticed a number that I thought were free flight oriented— The Wichihawks, for example. This club and a number of others are listed as MU. My curiosity is this: How many clubs exist out there that are registered with AMA as multiple interest clubs that are primarily free flight even though they have members WHERE ARE THE KIDS?! who fly other events? The second curiosity is: How many free flight clubs are simply bout twenty years ago, this kind of not even chartered? Jim Longstreth with his version of Nats winning statement was regularly seen in the Well, all of you free flighters out there, Bostonian, the "Blue Fin.” Think his Is called A “White Fin." Stalick pic. national model press. I have not seen a your voice will be as strong as your willing­ comment or article on this subject in years, ness to stand up and be counted in the so it was with some pleasure that I read a AMA. Charter that club and if you are a newsletter article with this title just a few free flight club, don’t list yourself as a mul­ months ago. You will find it repeated later tiple interest club. By the way, the club inthiscolum n. Since I have just completed survey that I mentioned at the start of this mailing out 57club surveys to AMA char­ column is only one of three free flight tered free flight clubs, the question that I surveys that are being conducted at this am asking myself is: Where are the free time. The National Free Flight Society is flighters? It is a question that the A M A has conducting a poll of all of its members, and been asking us for quite a few years, and to the National Indoor Model Airplane Soci­ be perfectly frank, I would be asking the ety is doing the same. Please complete any same question if I were an A M A officer. and all of these surveys that come to your Here are the numbers that I received from door. The information gathered from all of the AM A when I asked for a listing of the these sources will prove helpful to the en­ chartered clubs by district so that I could tire free flight movement in the country. mail out the club surveys. Of the 2411 AMA Thanks a bunch, and let’s get on with some chartered clubs in the country in 1989, 57 of the features of the May column. of them are listed as free flight clubs. That MAY MYSTERY MODEL is, my friends, a whopping 2.4% of the Bruce Kimball’s Pennyplane piggybacking a ride The late Conley P. “ Lucky” Moody was from its high perch via Andrew Tagliafico's total. The only district that has double digit one of those folks who liked to build and helium balloon. Some damage suffered, but re- numbers of clubs is District X, with 18 free fly nice looking ships. When I first met buildable. Stalick pic. flight chartered clubs out of 311 (5.8%). Lucky, it was at one of our N. W. area meets, The lowest number is in District VIII. They and he was really interested in promoting have one free flight club—The Houston some Pacific Ace kits that he had been (Texas) Free Flight Club—out of their 242 kitting. He was a guy you could talk to for chartered clubs. hours about the “ good old days.” In those

Tom Stalick launches his Pacific Ace Bostonian Bill McDow produced this nice little Curtiss Robin Bostonian ship for the W MC Indoor season. Nifty (an MB plan) at the WMC Indoor Meet, South model is still being trimmed. Bob Stalick photo. Albany. Stalick pic.

58 MODEL BUILDER Smiling Bill McDow and his P-24 Indoor duration ship. Scene Is South Albany H.S. gym at Willa­ MAY MYSTERY MODEL mette M.C. indoor meet. Stallck pic. good old days, Lucky did a fair amount of shepherding a number of younger con­ such a model. It is straightforward and building and flying. This design was one of testants as well as flying in practically every lightweight. With a hot Tee Dee .049, I his 'ΔΑ ships, and it just misses the cutoff event being held. After looking over his have no doubt that the ship would be a date as a Nostalgia model. The ship has a free flight fleet, it became apparent to me solid competitor for a first place at most nice streamlined fuselage that was blended that his ships are built to be functional free flight meets. With about 280 square into the Holland Hornet engine with rather than beautiful. The Outrider is just inches of wing, it is well suited for category timertank. With only 200 sq. in. of wing area, it must have had a rocketlike climb. Anyhow, the rules of the Mystery Model competition are simple: If you know the name of the model, write it on a sheet of paper along with your name and address, then fire it off to Bill Northrop, Model Builder magazine. If yours is the first letter in the Model Builder office with the correct answer, you receive a free, one-year sub­ scription to my favorite magazine. Now, Bill uses some form of geographical cor­ rection to allow for distance and such. Periodically, the winning entries are writ­ ten up in this column. That’s it. Simple. MAY THREE-VIEW: BORTNAK’S OUTRIDER 1/2A POWER MODEL John Bortnak is one of those free flight- ers that seems to win a large number of events and championships at the larger U.S. and Canadian meets. Even though we had corresponded off and on for several years, I met John for the first time at the Tri-Cities Nationals in 1989, where he was Jim Moseley, Ontario, Canada built this ultralight 1/2A gas model. . . the Apple Honey. All built-up construction, 225 sq. In., weight 4-3/4 ounces with TD .049 engine. Should be taaast! Moseley pic.

DARNED GOOD AIRFOIL - Gottingen 144 (M.V.A.H. 21)

II I I I

STATION 0 1.25 2.5 5.0 7.5 10 15 20 30 40 50 60 70 80 90 95 100

UPPER 1.50 3.06 3.96 5.40 6.30 7.00 8.08 8.69 9.19 8.90 8.08 6.96 5.65 4.18 2.23 1.25 0.00

LOWER 1.50 0.56 0.28 0.00 0.10 0.22 0.84 1.39 2.23 2.34 2.23 1.95 1.67 1.10 0.56 0.28 0.00

MAY 1990 59 σ> 6.625 1/16 χ 3/16 3 LAMINATIONS

1/2 in. T.E.

THE OUTRIDER' 1/2A GAS JOHN BORTNAK, CALGARY, ALBERTA ORIGINAL DESIGNED IN 1965 1/5 SCALE FLIES RT -RT PROP 5.5-3 CUT FROM COX 6 -3 GREY NYLON FUEL 65% NITRO, 17% PPO 9% CASTOR, 9% KLOTZ COVERED WITH JAPANESE TISSUE

<£ o o PYLON CROSS-SECTION CENTER 1/16 SHT SIDES 1/32 SHT TOP AND BOTTOM 1/8 SH T

s ο Ο m CO c F o m 3 Bob Piserchlo launches his Wakefield at Lost Hills Field, CA, for Patterson George Xenakis winds his Wake at Los Hills. After a long chase, you need a FAI Challenge, Nov. 18-19, 1989. Note open spacel compass to find your way back. No klddln'l

II and III meets but appears on the small Indoor Championships. In fact, the World separated from the remainder of the AM A side for category I contests. The design is Champs are scheduled for June 4-6 and events and will be held in Lawrenceville, very straightforward and is presented in the USIC w ill be held later in the same Illinois. In addition to the Free Flight Nats, 1/5 scale so that it can be enlarged easily. week, June 7-9. Here is your chance to take SAM 57 Old Timer and FAC Scale events as Full-sized rib patterns are included for your in the best indoor flying in the U.S.A. as well as the Nostalgia Champs will be held use. The three-view was taken from a re­ well as the world all at one site, all at one at the same site at the same time. Unfor­ cent issue of the now defunct Okie Free time. The site is located on the campus of tunately, due to the lateness of the A M A Flight Flier newsletter. East Tennessee State College and is one of decision, the meet could not be scheduled MAY DARNED GOOD AIRFOIL: the premier locations for indoor meets in until October 16 through 20. This late date Gottingen 144/MVAH 21 this country. may preclude attendance by many people Once again, I have gone to my file of For awhile, it appeared that the World who are affected by school schedules. airfoils from the Comprehensive Refer­ Champs would be held in the Romanian However, we free flighters now have our ence Guide to Airfoils for Light Aircraft. salt mines, site o f one other world cham­ own Nats. This section comes from the Gottingen pionship meet; however, with the political A M A intends that the Free Flight Nats laboratories and was wind tunnel tested in upheavals occurring there, the offer to host will rotate to various parts of the country 1917. The reason I selected it is that it has vaporized. Another site being promoted each year. Ostensibly, the West Coast free some of the qualities that free flighters was the Kibbie Dome in Idaho, but given flighters will have the honor of hosting the seek. It is 9% thick, has a moderate under­ the short amount of time available, the AMA/NFFS Nationals in 1991. If you want camber and a rounded leading edge. In Johnson City location and organization was more information about the 1990 Nationals fact, the front third of the airfoil is really selected as the place. So, if you are inter­ in Lawrenceville, send a large SASE to quite thick in comparison to the remainder ested in attending as a spectator, helper, or USOC, 4760 N. Battin, Wichita, Kansas of the profile. Since it has an upswept lead­ contestant, keep your calendar clear dur­ 67220. ing edge and a rounded entry point, it ing the week of June 4-9 and make plans to AMERICA’S CUP COMPETITION—1989 should be a section that is forgiving and be in Tennessee. Further detailed informa­ The following information was provided flexible for ease of flight adjustment. If you tion will be carried in this column and by Al Hotard, who has been the promoter are looking for a section that would be other free flight publications. But if you of the America’s Cup Competition: good for models that require good lift can’t wait, send a large SASE to NFFS Presi­ “ The 1989 America’s Cup Competition characteristics and ease of trimming, give dent, Tony Italiano, at 1655 Revere Dr., is finished, and we have the winners! They this one a long look. Brookfield, Wisconsin 53005. are: Matt Gewain in F1A Nordic, Paul INDOOR WORLD CHAMPIONSHIPS, AND WHAT ABOUT THE Crowley in F1B Wakefield, and Bob Sifleet 1990—JOHNSON CITY, TENNESSEE 1990 AMA NATIONALS? in F1C Power. The SCAT Club extends con­ With all of the discussion about the loca­ As many Nationals competitors are gratulations to these three competitors in tion of the 1990 Indoor (FID) World Cham­ aware, the AMA has dealt the National this, the first official year of competition. pionships, the final venue has been set. Free Flight Society an opportunity to host We look forward to awarding the beautiful The Champs will be held at Johnson City, the 1990 Free Flight Nationals. This year, Tennessee in conjunction with the U.S. the free flight events are going to be Continued on page 94

Matt Gewain, Nordic winner and America’s Cup F1A winner, with wile, America's Cup Trophies (I to r): Bob White, Craig Cusick, Hector Dlez, Gall, and Juan Livotto, at left. Photos by Al Hotard. Juan Llvotto. Craig, Hector, and Juan are SCAT club officers.

MAY 1990 61 contacts away from the heat of compe­ m i - ■ I tition. Contests are listed in the Academy of i i Model Aeronautics’ Competition News­ letter, which is in the back of Model Avia­ tion magazine. Local clubs usually have rBifesssI newsletters which keep members and sub­ scribers up to date on contest schedules. Hobby shops often post contest flyers. The contest also is a place to find out about area clubs and fliers. Even if the contest is some distance away, it would be worth the drive for a sport flier to attend. You’ll learn a lot and make new friends. Competition modelers also have some springtime opportunities which some might consider necessities. A few might include: Speed (Her Bill Nusz with his flock of fast birds at the 88 Regional Control Line Champs. The 1990 • Test flying new airplanes and prac­ contest is May 26-27 in Eugene, OR. Photo by author. ticing with them before going to that first contest. This is true for every type of model. Do your testing and practicing on your home field away from the pressure of competition and avoid embarrassment and failure. • Inspection of all pre-existing equip­ ©ΏΏΏΡΏΰ LLliica ment. Examine all the nuts, bolts, screws, fittings, hinges, pushrods, elevator horns, BY JOHN THOMPSON etc., to make sure they’re functional and safe. Check wing and stab joints and other stress points to make sure they are not cracked or loosening up. Check leadouts to make sure they aren't frayed. It’s essen­ tial to check lines and handles for safety. Make sure your lines aren’t frayed, cor­ roded, etc. Give them all a pull test. High­ speed lines may need to be completely replaced each season. Better safe than sorry! • Stocking up on supplies for the sea­ son. You’ll need ample supplies of fuel, plugs, props, lines, etc. • Examining the AMA rulebook and your local rules sheets to make sure you’re up to date. The first rule of competition is: Know the rules! • Most im portant of all for everyone— get out and go flying! Half-A Mouse Race is a popular NW Regionals event Paul Glbeault shows excellent form as he THE CONTEST TRAIL makes the catch for a pit stop. Contest activity is popping up all over LETS GO FLYING forward in their hobby by dropping in on the country at this time of year—and prob­ competitive events. ably near you whether you know it or not. Even a modeler w ho never plans to fly Unfortunately, most contests are not an­ t’s the time of year where almost every­ c o m p e titiv e ly sh ould n o t pass up the nounced far enough in advance for men­ Ibody in the C/L world gets out to the chance to attend nearby contests. Contests tion in this column, but we do try to men­ flying field with those new winter projects are where the very best modelers in the tion those we know about. and begins to lim ber up the flying skills. hobby gather. Just in going about the rou­ We have word of two in the Pacific Even where the winters allow year-round tine of their competitive programs, the ex­ Northwest that have become West Coast flying, that warm, dry weather makes it pert modelers are virtually giving seminars "must” contests for serious fliers with the even more fun. in how to do things efficiently and well in ability to make it to them. Winter, for many of us, is workshop time. the control line model aviation hobby. First it's the Northwest Regional Control Now that it’s spring, the workshop takes a Contestants usually are quite willing to Line Championships in Eugene, Oregon, back seat to the flying field. If you were answer questions and show off their on May 26-27, at Mahlon Sweet Airport. busy doing your building all winter—not equipment. As a courtesy, spectators and Sponsored by the Eugene Prop Spinners in wasting your time watching those ball- “ students” visiting for educational pur­ cooperation with other Northwest clubs games—you’re all ready for the season. poses should pay attention to the contes­ and individuals, it is one of the largest C/L Spring brings with it all sorts of oppor­ tant's first concern—the contest—and meets in the nation, with 36 separate tunities in addition to simply flying. make sure to ask questions at a convenient events, 112 trophies and merchandise For sport fliers, naturally we want to get time (not when the contestant is scram­ prizes for everyone who places. flying those new planes. But the oppor­ bling to get ready for a heat, match, or It occurs on one of the nicest control tunity to further our modeling education official flight!). Even if you don’t get a line flying sites in existence, a facility per­ also is never better. Now is when the com­ chance to talk in detail, just watching and manently available to local fliers and fea­ petition modelers all over the country start listening will provide a wealth of informa­ turing, for competition, three asphalt cir­ their heaviest season. It’s a golden oppor­ tion. Any modeler will be glad to exchange cles and four grass circles. The site is at an tunity for casual fliers to make great strides addresses and phone numbers for later active airport, with restaurant, restrooms,

62 MODEL BUILDER rental cars, and other facilities within walk­ Therefore it is with considerable joy that ing distance. Camping is allowed on the I often find in the mailbox, right alongside field and there are motels and other the letter with the above question, the amenities within s few minutes’ drive. answer in the form of a new mailing from There are a few changes worth noting in one of the many “ garage" suppliers of C/L 1990: products. It’s a secret sometimes kept from • Northwest Goodyear has been added newcomers, but our hobby has a vast array to the schedule, replacing FAI Team Race. of suppliers that is growing and changing This is a low-key Scale Racing event that daily. allows non-Nelson, non-Rossi engines. And, in some ways, these "garage” busi­ • FoxDoo Combat has been changed to nesses offer a level of quality higher than Fox .35 Combat. This will allow any airplane has ever been available to C/L modelers. to be used, as long as it is powered by a Fox Proprietors of these businesses are active .35 stunt engine. Two airplanes maximum C/L fliers who devote tender loving care to allowed per pilot. There is a 30-second each and every item they sell, something engine starting period before the five- the most earnest mass-producer finds d if­ minute match. All other rules are per AM A ficult. Fast Combat. The array of products available is • AM A Fast Combat will require .021" x astounding. While a trip to a hobby shop 60' lines as a new safety measure. might lead you to believe that there are • Northwest Super Sport Race will use only perhaps a half-dozen kits now manu­ the new rules allowing the sport .40engine. factured for control line, I would guess The contest events will be: that there actually are perhaps three or Speed: 1/2A, A, B, D, FAI, Jet, Formula four dozen! You just have to know where 40 and .21 Sport Speed. to find them. Navy Carrier: .15 Profile, Profile, Class I, The customer would be well-advised to Class II. learn some of the rules of supplying his Racing: Mouse I, Mouse II, Goodyear, demands in the modern control line era: Mel Marcum (I) and an assistant judge Sport Northwest Goodyear, Rat, Slow Rat, North­ • Try your local hobby shop first. It’s Scale planes at '89 NW Reglonals. Sport Scale is west Sport Race, Northwest Super Sport important, even if the shop doesn’t have one of the low-key events; quite popular. Race. what you’re looking for, to let the proprie­ Aerobatics: Precision Aerobatics in the tor know you exist and are in the market • Understand that garage manufactur­ following classes: PAMPA beginner (new for products. Enough contact from C/L ers w ill be a bit irregular in regard to their AMA beginner pattern), intermediate, modelers has helped many hobby shops delivery schedule. They may get behind advanced, expert. Old Time Stunt, Nostal­ rediscover our segment of the hobby. on their orders, particularly if they produce gia Stunt. Many of the garage manufacturers are in top quality, sought-after merchandise. Be Scale: Sport, Precision. the business primarily to fill a need and a little patient with them. The product will Combat: AMA, Slow, Fox .35,1/2A. would be delighted to see the demand be worth the wait. Balloon Bust. filled by mass producers if it reaches a high • Most garage manufacturers are sin­ Junior events: Mouse I, Northwest Sport enough level. cere, dedicated and skilled craftsmen and Race, Balloon Bust. • Collect catalogs from the cottage in­ modelers. However, some are less so. Your For a flyer, copies of regional rules or dustry businesses. Almost every m odeler/ only guide will be your own experience other information, contact John Thomp­ manufacturer publishes a catalog that lists with them. When you deal with mail sup­ son, 1520 Anthony Ave., Cottage Grove, his products. The catalogs are updated fre­ pliers, your first order is a gamble. In most Oregon 97424. quently. Maintain a list of addresses of cases, it pays off handsomely. If you have a * * · these suppliers and correspond if you have bad experience with a supplier, don’t hold it against all the others. Another traditional high point on the questions. They’re all happy to answer your • Don’t give up on the major mail-order Western contest circuit is the Bladder questions. suppliers. If your hobby shop doesn’t have Grabber triple-elimination Fast Combat • Remember that the "garage” manu­ what you're looking for, you may find it in tournament. facturers are just that. Most have other the fine print of one of the big catalogs or This year it’s scheduled for June 30 and jobs and produce their supplies as part of the periodic sale catalogs mailed by the big July 1 at Harvey Field in Snohomish, Wash­ their hobby. Don’t drive them crazy with mail-order firms. As a case in point, while ington, the same site used in the past two phone calls. A letter with a self-addressed, years. stamped envelope for reply is a much ap­ this column was being written I received a copy of Tower Hobbies’ Tower Talk peri- Several fliers from the Soviet Union, preciated form of communication, as is a dollar or two for the cost of printing the which sent a delegation to the 1989 U.S. Continued on page 64 National Championships in the tri-cities of catalog. Washington, are expected to attend the 1990 Bladder Grabber. BG official Howard Rush reports that the Soviets have Fox Combat Special engines and also are building their own .36engines for combat. As usual, the Bladder Grabber, the first and longest-running of the “ pro" combat contests, will offer $10,000 in stereo equip­ ment as prizes, donated by stereo giant Bob Carver. Information is available from Contest Director Norm McFadden, (206)745-1314, or from Rush at (206)746-5997. MIXED BAG One of the questions raised by people writing to the C/L column is, "Where can I buy control line supplies?" Writers often note that their local hobby shops don’t Miles Maglster built by Plotr Zawada, using ST S61K. Second place in 89 Polish Nats. Plotr has had seem to carry any C/L materials anymore. several construction articles In MB. Photo submitted by Stu Richmond.

MAY 1990 63 Space Shuttle version of the big Fierce G*S* ° - V Arrow. A couple of these are being built now, and foam wings for it are available SERVO END POINTS from Aero Products, 1880 Scenic Hiway, Snellville, Georgia 30278, (404)979-2035.” * * n f f Tom also mentions that tuned pipes have been developed by Les Bollenhagen for Servo End Adjust Unit plugs into your radio between the receiver control line stunt, but no decision has been and a servo allowing you to set the “end points" of that servo. Landing gear (proportional servo) one trim pot will set the up made to mass produce them. If demand position and the other will set the down position. seems to warrant it, Tom says, ‘‘We’re Great for throttle too! Price: (less radio connectors) $22.50 ready." connectors installed $28.50 Dixon’s catalog includes a vast array of CUSTOM ELECTRONICS Bolly carbon fiber and glass props for all P.O. Box 1332. Alta Loma. CA 91701 (714) 980-4244 C/L applications (the catalog is a must for (Free shipping with this ad. Calif, residents add 6% sales tax State that alone!), Merco, Magnum, Fox, Royal, End Adjust Unit type radio and connectors desired.) and K&B engines, SST mufflers (average (weight .4 oz) Redundant Radio System, Servo Driver 1/2 oz. weight!); various other engine ac­ Send for a free brochure cessories, landing gear, spinners, control linee Classics kits (Super Pow Wow, O rien­ tal, Ares, Buster, Galaxy, Tomahawk, and HERES 2 OLD TIM E FAVORITES FOR Oriental profile), kits of the Barnstormer, 3 CHANNEL ELECTRIC SPORT FLYING All American Senior and Magician, and a tremendous list of plans for Old Time, ^ i n d y 's ^ e c t r i c Nostalgia and modern stunt. AN 0 5 ELECTRIC VERSION OF THE FAMOUS And Tom is only one of several suppliers SPIRIT OF ST. LOUIS. WHICH LINDBERGH FLEW doing this kind of work—others have been INTO HISTORY IN 1927. mentioned in past columns and will be SPAN 51 IN. $ 3 5 .9 5 again. * * *

PIETENPOL a i r c a m p e r The mailbag also contains some changes A ROBUST FLYING ELECTRIC VERSION OF A of address for a couple of the major special POPULAR HOME-BUILT OF THE 3 0 ’s ERA. interest groups and their newsletters. SPAN 49 IN $ 4 5 .5 0 The Precision Aerobatics Model Pilots Association’s newsletter, Stunt News, now MODEL can be reached through editor Mike v / c t o r PRODUCTS Keville, who has moved from California to 12258% WOODRUFFXIDRUFFAVE. AVE ______DOWNEY CA .90241 SHIPPING. ·*■*■■“ ■ ----- 13) —— FOR INFO SEND A SELF 6109 E. Ivyglen, Mesa, Arizona. PAMPA’s PHONE(213)803-1897 $ 3 .0 0 ADDRESSED, STAMPED ENVELOPE membership chairman is Tom Morris, 1019 Creek Trail, Anniston, Alabama 36206. The "2. Kits: I’m producing a line of quality new president is Ted Fancher, 158 Flying Control Line Continued from page 63 stunt kits. All bandsawed parts, Sig hard­ Cloud Isle, Foster City, California 94404. ware, copies of original article where ap­ The Miniature Aircraft Combat Asso­ odical with quite a nice list of C/L engines plicable. Any of the plans in my catalog ciation's MACA News also has changed at good prices. (There are many! -jt) can be done but the hands. The new editor and membership The above references to mail purchasing ‘regular’ line is: chairman is Larry Driskill, 4916 Chagar St., bring us to another piece of mail received "Black Tiger designed by Bob Elliott, the Las Cruces, New Mexico 88005. just before this column was sent off to 1953 Nats winner (aka Berkeley Wombat). ♦ * * Model Builder. It’s the latest catalog from This is available now for $59.95 plus $3 Every C/L event requires some kind of Tom Dixon of Atlanta, Georgia, one of the shipping. pull test before competitive flying. The suppliers of quality products, primarily for "1952 Nobler should be ready in late lines, handle and airplane are tested either Precision Aerobatics but for other events February. Will be re-engineered to build to some prescribed pull in pounds or in as well. It is definitely a "m ust have” cata­ light with available wood. George Aldrich "Gs” (based on the weight of the plane). log. To get it, write to Tom at Suite 401,1938 (Nobler's designer - jt) has given this Sometimes these “ G” figures can be a bit Peachtree Road, Atlanta, Georgia 30309. project his blessing. of a nuisance to calculate. As mentioned above, Tom advises fliers "(Probable) Skylark designed by Ed George Lieb of the Omaha, Nebraska to try to find the products they need at Southwick. Don't have Ed’s permission yet, Orbiting Eagles, has forwarded a handy their local hobby shops first. He deals in but do have the prototype kit cut. Will chart of G ratings for planes of weights products he believes can’t be found in have to do some corrections before it’s from 16 to 64 ounces at G ratings ranging hobby shops. And, he’s w illing to help cus­ ready for sale. from 20 to 40, plus multiplier factors for tomers find the items he doesn’t have. "(Planned) Ruffy designed by Lew Mc­ some intermediate ratings. The chart also The envelope from Tom also contained Farland. includes the rulebook’s requirements for some excellent news. I’ll let his letter speak “ (Planned) a profile sport stunter biplane each C/L class. probably based on the Zephyr published for itself: The chart is a bit lengthy to publish here, "1. Merco engines should be back in in Model Airplane News a few years back but I'll include George’s address in case production in late spring ... after the but prettier. anyone should like a photocopy. If you change of ownership. The .61S will be back “ Something modern for ,40-.60engines, write George asking for a copy, please en­ essentially unchanged. The .29 and .35 likely my Charisma elliptical wing close a self-addressed, stamped envelope stunter... stunt are defunct, to be replaced by a .30 and a quarter for the cost of photocopying "All of these are being engineered for and .40 ABC. That's ‘loop scavenged single it! (That's my recommendation—George competitive weight with generic average bypass ABC,' not Schnuerle. I’ve asked didn't mention it but he’ll sure appreciate them to send me examples to run and fly wood, which is all there is out there; might your courtesy.) Write George Lieb, 5202 before I pop fo r a large volume purchase. as well plan on it... Emeline St., Omaha, Nebraska 68157. The R/C engines are to be handled by "Several new plans are in the catalog. Hobby Lobby. I will remain the Merco Not yet listed but available is Bill Netze- * * * service center. band’s Fierce Arrow 400. There is also a Each time we mention some unusual or

64 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER historical topic in the column, it generates (714) 642-3799 several letters from people with additional information—so we occasionally follow up with an addendum. (Boy, did that column on autogyros generate a flood of mail!) One of the recent topics that generated PEC1ALCT some interest was the reference to flying The super’ systems C/L from outside the circle. A letter from Maneuver, mix, adjust, Bob Root of Vermilion, Ohio, adds some historical perspective: reverse and monitor. "Raymond DeWitt designed and built a We introduced expo rates! U-control pylon device similar to the units Three, six and eight channels shown in your November column. The unit he built was a more rugged design in­ “STILL THE BEST!” corporating ball joints in the linkage and a cMILLCOTT seat for the pilot. Millcott Corporation “ This was in Plymouth, Ohio, in the late 177-F Riverside Ave. Newport Beach CA 92663 1930s. A more exact date could be estab­ lished if we knew when the Super Cyclone twin-plug engine and the Stanzel C-Shark Satisfaction Guaranteed! were introduced. I flew my Shark with the Super Cyclone on the pylon. "It was fast for its day and looked even faster when it was headed my way on the outside of the circle. I also flew my four- foot span SE-5 (scratch built) with a Brown EASY h in g es Jr. engine. My SE-5 fell victim to an errant THE HIGH-TECH HINGE DESIGNED FOR THE CYANOACRYLATE AGE softball. Lesson No. 1: Don’t fly anywhere Easier to install than any other hinge - No more gouging, picking, or messy epoxies. near a ballfield. "Raymond scratch built and flew a four- Simply cut a single knife slot for each hinge, slide the hinges in foot span Great Lakes biplane on the pylon. place, apply a few drops of your favorite CA glue - and you're done! His first attempt at a loop was a failure. SUPER FAST, SUPER EASY and SUPER STRONG. Lesson No. 2: Don't fly too high; the lines go slack. Needless to say, we didn't fly on windy days. "74e Sedt 'itywqed “tyrM “Suy "At last report Raymond was living in SIG MFG. CO., INC.«401-7 So. Front St.«Montezuma. IA 50171 · (515)623-5154 Florida and had developed some of the hand tools used in the space flights. "I am retired after 42 years in manufac­ Inclusive travel dates for the Milwaukee years ago in Model Builder. He then turing and hope to get back to model show (Oct. 5-7) are Oct. 2 through 10,1990. wanted to branch out into other model building as soon as I get all the projects in To take advantage of these fares, follow building subjects, so we changed his col­ the 'job jar' completed. these simple rules: umn title, stealing a little from another "I enjoy all the features in M odel Contact Delta or have your famous Dave’s logo, "Thornburg at Large.” Builder, having been involved in free flight, travel agency call His writing has been sorely missed by many control line and the early days of R/C.” 1-800-221-1212 and ask to of our readers. However, Dave has always To Bob Root from Model Builder: Wel­ speak with Delta’s stayed in touch, and kept his pencils sharp. come back! Special Meetings Network. We knew it was just a question o f tim e As always, letters, photos, club reports, before we would all hear from him again. contest schedules, and reports are wel­ Refer to Reference File Number So we’ll let him do his own press release come. W rite John Thompson, 1520 K22088. ... after all ... he is a writer! Anthony Ave., Cottage Grove, Oregon New R/C Soaring Book 97424. · Hotels offering special rates to IMS at­ During the late seventies and early tendees in Atlanta are as follows: eighties, Dave ("Bird of Time") Thornburg contributed over sixty construction articles Workbench Continued from page 7 HEADQUARTERS HOTEL Comfort Inn (formerly the Ibis) and essays to the modeling press. Now above, reservations and ticketing must be 101 International Blvd. N.W. fifteen of his best soaring pieces have been made a minimum of seven days in advance. Atlanta, GA 30303 (404) 524-5555 reprinted in paperback. Any changes to the outbound reservations IMS Rates: $49. single or double, up to Old Buzzard’s Soaring Book is jammed must be made with seven days advance four occupants per room. with tips from the experts: thermal lore, notice of the new flight. Changes to the OTHERS contest do’s and don’ts, programming return flight may be had at any time. There Westin Peachtree Plaza yourself for better landings, ways to im­ are no penalties for change or cancellation, Peachtree St. & International Blvd., N.W. prove kit models, techniques for designing when using these discount fares. Atlanta, GA 30303 (404) 659-1400 your own sailplane. The 160-page book A 5 (five) percent discount is also avail­ Call for special IMS rates. includes two of Dave's classic essays on able to you on Delta’s published excursion thermal-hunting, ‘The River of Air' and Days Inn Downtown fares, including instant savers. If you elect ‘The Perfect Thermal.’ Many pilots have 300 Spring St. to use the 5 (five) percent discount off any called ‘The River of A ir’ the single most Atlanta, GA 30308 (404) 523-1144 excursion or instant saver fares, all rules helpful article they ever read on R/C Call for special IMS rates. and conditions of the fare will apply. soaring. In all cases, seats are limited, so you are Special hotel rates for IMS attendees in The book’s first nine chapters focus on encouraged to confirm reservations as Milwaukee will be announced in the near flying; the last four cover sailplane design soon as possible. future. and basic aerodynamics. Dave's non- Inclusive travel dates for the Atlanta THORNBURG IS BACK . . . SORTA mathematical approach to aerodynamics show (May 18-20) are May 15 through May Dave Thornburg wrote a very popular is both witty and wise... without a single 23,1990. monthly column on R/C soaring some formula, he manages to explain not only

M A Y 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 65 "HOT STUFF" Leading the way for 20 years !

r~UFO~ I

THAT'S ALRIGHT I 1st. U.S. R/C Flight School Brad & Dave Scott 521 S. Sawyer, Shawano, Wt 54166 NO ODOR - NO FUMES (715) 524*2985 "Flight Log" STRONG SMOOTH AND TIGHT] We continue flying and training here, nearly 50 CAME OUT LIGHT students so far this season a d d e d to th e p re v io u s 100 in 87-88. We've racked up a n o th e r 2 0 .0 0 0 a ir m ile s s o SURPRISE-SURPRISE far. The models take a terrible Q beating from HARD landings! Not a spar, longeron or GLASSED A FOAM WING s trin g e r h a s n o t h a d a c ra c k o r b re a k o n la n d in g s . A n d LATE LAST NIGHT th o s e p o o r n o s e g e a rs a n d firewalls! But - A ll re p a ira b le with “HO T S TUFF’ quickly at the field and back into the air w e go.

n Ή Ο Τ S T U F F * h a s n e v e r “ fa ile d in th e p a s t 3 y e a rs 8 over 50,000 (fifty thousand) tNDLY ODORLESS a ir m ile s a n d s o m e 2 0 .0 0 0 landings. We've seen all the INSTANT GLUES ad hype. but. in the real world HOT STUFF" EXCLUSIVES

Satellite City P.O. BOX 836, SIMI VALLEY, CALIFORNIA 93062 PHONE (805) 522-0062 how your airplane flies, but how you can its products, Cox w ill include in each of pions; Charlie Hillard, Gene Soucy, and make it fly better! these packages a “ Video Copilot” to com­ Tom Poberezny, also celebrating their 20th Many of the chapters in Old Buzzard’s plement the included assembly and flying year as air show performers. Joann Osterud Soaring Book originally appeared, in instructions. Assembly highlights, pre­ will perform aerobatics in her “ Supernova” shorter form, in Model Builder magazine. flight checkout, proper hand-launching Hiperbipe. Jim Franklin, Johnny Kazian, Each piece contains new and updated technique (an art in itself), detailed audio Steve Franklin, and Tony Kazian will do material, including over fifty new cartoons, treatment on setting the needle valve, and their dual wingwalking routines in their illustrations and comparison charts. flight orientation tape are all included. A UPF-7 Waco’s equipped with brute sized, “ This is a book for intermediate soaring great idea! eardrum-busting radials that tingle your pilots, not rank beginners," Dave says. "It RENO AIR RACES, 1990 spine. Something else . . . those guys out w on't tell you how to cover a wing or test The 1990 Reno National Championship on the wings may be holding onto a rack glide over tall grass. Old Buzzard is for folk Air Races, the 27th annual event, will again when doing some of the tumbling and who already know how to fly ... folk who feature all four classes of racing along with inverted flight routines, but being out at are starting to think about how they might some of the most popular air show acts in one of the pylons, waiting for the next fly a little better, land a little more consis­ North America. race, we saw them climbing from the lower tently, compete a little more successfully at The four-day event, September 20 wing to the upper, or working their way contests. Also, it’s just a fun book to curl up through 23,1990, will include a mixture of out to an outer wing strut, all being done with on a rainy night. It's full of blue skies air show performers and approximately in as casual a manner as making a peanut and cumulus clouds and rising (wow ... I eight races per day. Among those per­ butter sandwich, and no safety line! almost said hot) air. There's even a chapter forming each day will be the Canadian Back after a four-year hiatus, Leo Lou- or two on slope flying, in case you need a Snowbirds, celebrating their 20th anniver­ denslager, the 1980 World Aerobatic break from the pursuit of the wily sary as a precision jet team at this year’s Champion will be piloting the Bud Light thermal!" event. 200. Also present will be professional sky­ Old Buzzard’s Soaring Book is available Though not as fast as some of the much writer Suzanne Asbury-Oliver, flying the direct from the publisher, The Pony X Press, modified aircraft in the Unlimited cate­ colorful Travel Air D4D, and Rick Brickert, 5 Monticello Drive, Albuquerque, NM gory, Lefty Gardner will not only be racing Dennis Sanders, and Frank Sanders, w ill be 98123. Price is $14.95, plus $1.50 shipping his P-38 Lightning, but w ill also dem on­ flying the Red Knight, and all-red Lock­ and handling. Or call (505) 299-8749 for strate its aerobatic capabilities. After heed T-33, that performs large, spectacular Visa-MC or COD shipment. Dealer dis­ watching him race last year, we don’t know maneuvers accented by two wingtip counts on ten or more copies. how he avoids getting grass stains on the smoke tanks leaving unusual trails affected INDUSTRY NEWS left wingtip when he's rounding the by the tip vortices. Cox Hobbies, Inc., 350 W. Rincon St., pylons! Tickets for the Reno Air Races can be Corona, CA 91720, phone (714) 278-1282, Bob Hoover will again perform aero­ obtained through various Bass Ticket has introduced something special into its batics in the Shrike Aerocommander and Centers and Ticketron outlets. Check your new 1990 line of fuel and electric powered in the Sabreliner twin-engine jet. He will local listings. Biggest problem is finding a R/C aircraft which include a two-channel also continue to pace the Unlimiteds in place to park you bod at night. Hotels are R/C system as part of the package. It will their three-a-day races, flying his P-51. signed up a year in advance. If you have a probably start a trend to be followed by Other performers will include the Eagles friend in Reno, take your sleeping bag and others in the industry. Realizing that so Aerobatic Flight Team that is such a favorite borrow some space on the living room many newcomers to flying R/C are buying at the Las Vegas Tournament of Cham­ floor! ·

66 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI MODEL BUILDER vy 1* 0*. noooico. me. r ovnetylctdbhn moked sm a behind located conveniently are lsi ndw. dow in w plastic ore m and rates, dual switches, reversing Servo system. radio Advance each ith w KS100 servos, and full N iC dsare included ur fo dsare iC N receivers, full and conversion servos, KS100 dual -band arrow N HMk 1991 ADVANCE I e d o I C e s l u P or> r 'o V a \ u d o A f

exceed A M A requirements for for requirements A M A exceed Kyosho Advance Series 91 radios Series Advance Kyosho the transmitter to your personal touch. personal your to transmitter the elevator, aileron, rudder, r fo s trim fle xib ility so that you can custom ize ize custom can you that so ility xib fle more...all and low-end, ttle ro th and ratchet fine elevator, both r and fo aileron switches rate every dual on channel, reversing servo : want you them where most, want you high-torque four plus characteristics, conversion dual and itter Label transm Gold 1991-certified, a features 91 Series Advance FM 7-Channel flying. f o located fo r easy access, w ith enough enough ith w access, easy r fo located KS100servos. narrow-band excellent ith w receiver that systems 7-channel 5- and able and guidelines technical A's AM the 91 Series Advance radios are tru ly ready fo r 1991.Each r fo ready ly tru are radios types all r fo features versatile provide afford­ offer also and specifications control radio r fo ents 1991 requirem narrow-band operation. The new new The operation. narrow-band Great Planes. copy of Kyosho's Mini Catalog from Catalog Mini of Kyosho's copy FREE for your toaddress our Send Each system offers the functions functions the offers system Each Kyosho 5-Channel PCM and and PCM 5-Channel Kyosho Kyosho Kyosho is w ell ahead o f the AM A's A's AM the f o ahead ell is w radios exceed exceed radios es i 9 s ie r e S ADVANCE tPl S E N l^ /tfP E R G ^ years to come. to years needs. flying attitude. flight stable a desired to trim control smooth ensure that tures systems — and w ill continue to to continue ill w — and systems individual be your can meet to aileron adjusted ith w to coordination ailerons ith w rudder its of perm itter coupling 7- the transm on FM found Channel coupling Channel t h flig r u yo pre-set to you enables feature This over. takes fail-safe servo last your retains PCM's hold 5-Channel variable The flight. during provide versatile control fo r many many r fo control versatile provide narrow-band 7-channel 5- and value in best your are Advance radios 91 Series Kyosho priced. high be Rudder yaw. adverse correct help system's the seconds, 0.8 than longer dis­ signal f o event the in position ruption. If the interference lasts lasts interference the If ruption. AINIEECUSVL^OU H UG SIVELY^RO EXCLU NATIONWIDE _ And Kyosho adds the special fea­ special the adds Kyosho And High technology doesn't have to to have doesn't technology High . O “ DISTRIBUTED TO LEADING RETAILERS RETAILERS LEADING TO DISTRIBUTED BOX DISTRIBUTORS Q Y ^ • q h s · 1991

BYRON Performance Blended Fuels .ORIGINALS.n'c Higher Performance · Smoother Running twt SUM Λ Superior Lubrication · Unequalled Rust Protection SEE YOUR DEALER FIRST! If he doesn’t stock Byron Originals Fuels, order direct. ALL PRICES INCLUDE FREE FREIGHT. (Contlguout 48 Slates Only-Alaska. Hawaii, and Overseas, call for shipping quole.) FACTORY PRICE PER GAI.. ORDER NO. NITRO F U E L B LE N D RETAIL (CASE OF 4) CASK % PER G A L . 1-4 CASES 5 CASES & IIP Synthetic/Castor Blends 3130004 0% Premium F.A.I., Synthetic/Castor...... $ 9.50 S 6.90 S 6.40 3130005 5% Byro-Jet S ynthetic/C astor...... 10.95 8.00 7.50 3130006 5% Premium Sport, S yn th e tic/C a stor...... 10.95 8.00 7.50 3130008 8% Premium Super Tigre Blend (2500 & 3000)...... 11.95 8.60 8.10 3130010 10% Byro-Jet, Synthetic/Castor...... 12.95 9.00 8.50 3130011 10% Premium Sport, S yn th e tic/C a stor...... 12.95 9.00 8.50 3130012 10% 4 Cycle, S yn th e tic/C a sto r...... 12.95 9.00 8.50 3130013 10% Helicopter, Synthetic/Castor...... 12.95 9.00 8.50 3130016 15% Premium Sport, Synthetic/Castor...... 15.95 10.75 10.15 3130017 15% 4 Cycle, S yn th e tic/C a sto r...... 15.95 10.75 10.15 3130018 15% Helicopter, Synthetic/Castor...... 15.95 10.75 10.15 3130020 20% Byro-Jet, Synthetic/Castor...... 17.50 12.50 11.75 3130025 25% Premium Competition, Synthetic/Castor...... 19.95 14.25 13.35 3130035 35% Premium Competition, Synthetic/Castor...... 24.50 17.75 16.50 3130045 45% Premium Competition, Synthetic/Castor...... 29.25 21.25 19.65 3130060 60% Premium Competition, Synthetic/Castor...... 32.95 24.00 22.30 Straight Synthetic 2120004 0% Premium F.A.I., Straight Synthetic...... S 9.50 S 6.90 $ 6.40 2120005 5% Byro-Jet Straight Synthetic ...... 10.95 8.00 7.50 2120006 5% Premium Sport, Straight Synthetic...... 10.95 8.00 7.50 2120010 10% Byro-Jet, Straight Synthetic...... 12.95 9.00 8.50 2120011 10% Premium Sport, Straight Synthetic...... 12.95 9.00 8.50 2120015 15% Premium Sport, Straight Synthetic...... 15.95 10.75 10.15 2120020 20% Byro-Jet, Straight S ynthetic...... 17.50 12.50 11.75 2120025 25% Premium Com petition, Straight S yn th e tic...... 19.95 14.25 13.35 2120035 35% Premium Com petition, Straight S yn th e tic...... 24.50 17.75 16.50 2120045 45% Premium Com petition, Straight S yn th e tic...... 29.25 21.25 19.65 Minimum Order Quantity--! Case. Shipping Included in Price. Prices subject to change without notice. Byron Originals, Inc. · P.O. Box 279 · Ida Grove, IA 51445 · Fuel Orders Only: (712) 364-2009

petition recently. At the Aerolympics R/C only if I am a centerfold model myself? Or Jake Continued from page 7 World Championships in August, 1989, I should I buy this plane regardless of who I won the Roseanne Barr look-alike contest am, as long as I intend to wear high heels bracing, shed both its wings upon landing. at the Holiday Inn. and a bikini when I fly it? Cabainne’s final testbed, "d ’Lancoix Cyste” Jake I think it's a trainer airplane. Should I (The Boil Lancer), took care of the negative ♦ * * buy it if I have aspirations of becoming a bracing and added a fuselage mounted better flyer? Or should I buy it if I have machine gun for the pilot. Dear Jake: aspirations of becoming a better repairer? Skeptics warned Cabainne that the gun Any upcoming events where we can If I have aspirations o f becoming a bikini- would shoot off the propeller, but Ca­ look forward to not seeing you? clad model, is this the plane for me? How bainne had the last laugh when the pro­ Edna in Evansville about if I just have a nice aspiration? peller survived the one and only test flight Dear Edna: Confused Consumer in Connecticut without a scratch. The gun did, however, I'll be at Toledo again this year. I should Dear Confused Consumer: shoot off the central top wing struts and be easy to spot. I plan to divide my time I think the message is: buy the airplane left Cabainne at the controls of another between the main floor, the annex build­ because it’s a good airplane, just don’t let aviation first: the low wing monoplane. ing, the swap shop, and the men's room. In your wife see the ad. Ever since, all fuselage mounted top case you have trouble picking me out of Jake wing struts have borne the Cabainne the crowd, I’ll be the one with my AMA name, in honor of his flight demonstration number shaved on the back of my head. of their utility. Jake Dear Jake: Jake * * * I am an archaeologist at a major North­ * * * eastern research institute. Our recent digs Dear Jake: in Mesopotamia have uncovered some Dear Jake: Clad to see the level of good taste and fossilized balsa wood. Just exactly how old If you’re such a hot shot model airplane refinement in model airplane ads has risen is the hobby of making model airplanes? expert, when’s the last time you won again. Take for example the full-page ad PhD in Pottsdam, New York something at a major competition? which shows a bikini-clad young lady smil­ Dear Doc: Duke in Decatur ing seductively as she crashes a model air­ The model airplane game goes back Dear Duke: craft at her feet. Not to worry, says the ad, much farther than most of us would imag­ Well, first let me say that competition it's easily repairable. ine. We all know that mankind began in flying is not necessarily the only way to I'm not sure what the message is here. the Carden of Eden, and that woman was become an expert modeler. Sport flying, Am I supposed to buy one of these air­ created from one of Adam's ribs. But few fun flying, designing, and building are all planes if I plan to give it to a centerfold people realize that God took another one worthy pursuits with many an expert in­ model, because she’ll probably crash it, of Adam’s ribs and started the wing for a volved. but I'll be able to fix it easily, so she can Comet Clipper. As it happens, I have won a major com­ crash it again? Or should I buy this airplane Jake

68 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI MODEL BUILDER Bye-Bye Bubbles, So-Long Sags.

UltraCote™ Your favorite film covering’s back and it’s better than ever.

UltraCote’s back way you like it, it’s on regardless of changes in weather. with a flawless new for good. Its ultra-handy width helps finish, more colors, The high-temp film stretch your covering dollar. better color consis­ I k l W I without the high- tency plus all the UltraCote’s a better value, too. qualities that made it utiraCote (nghi). ttnuolly eliminates the temp headaches. Its longer, streamlined-width roll is chance ol mistering.' which can often great to begin with. appear m orainory hiternp films Some films don’t shaped more like the parts you have to So if you’ve never (left), os a plone 'ages.' bubble, and some don’t cover plus there are no unusable edges tried it, now’s your sag. But until UltraCote, to discard. chance. You’ll discover that UltraCote no one film could give you both With UltraCote, more covering ends doesn’t just beat the others, it virtually bubble-free a n d sag-free results. up where it belongs—on your model, re-defines performance standards for UltraCote is a true polyester film. instead of on your workshop floor. iron-on coverings. Like the film you’re most familiar with, The gloss that doesn’t glare. It goes on ultra-easy it responds well to higher temperatures, and takes a really permanent “set” UltraCote’s fade-free colors even and holds on ultra-strong. But unlike the other polyester films, have a richer, more realistic gloss that First off, UltraCote handles like UltraCote’s non-“gassing” adhesive won’t won’t leave your plane looking like a a dream. produce “bubbles” on sheeted areas, shrink-wrapped plastic toy. Its high-tech polymerized color- which show up later as blisters and So from start to finish, UltraCote to-film bond lets you re-position it wrinkles. is tops. Just try it yourself and you’ll without fear of layer-separation and Even areas of plywood won’t give know why thousands of modelers are its broad temperature range helps you you problems. ultra-glad CARL GOLDBERG coax it around tough curves with ease. Plus, unlike the low er-tem p films, it’s back MODELS INC. And once you’ve got it on the UltraCote’s drum-tight shrink is stable, at last THE FOX EAGLES HAVE ARRIVED! STATE OF THE ART DESIGN — MADE IN AMERICA Fbx Eagle 4: The Fox Eagle 4 is the latest Fox Eagle 4’s are supplied with a modification of the motor that Model conventional tilt down muffler. If a tilt Airplane News’ “Great Shootout" gave up muffler suits your airplane better, the highest points for power, idle, and you can exchange your tilt down merely overall performance and value The by sending it to us and asking for an series 4 features a new, sturdier exchange. There is no charge for this. crankcase casting, a larger diameter While we do not m anufacture pipes, the crankshaft, and a host of other Eagle 4 responds well to a conventional refinements. We believe that no other pipe installation. The screw spacing on 60 size m otor on th e m arket will pull a our exhaust flange is similar to the good size propeller as fast. Rossi screw spacing, and the hardware Compared to other 60 size motors designed for eith er th e Eagle III, Eagle on the market, the Fox Eagle 4 has the 4, or Rossi will fit readily. When the largest crankpin. the most massive absolute maximum power is desired, connecting rod, and is generally of the we recommend the use of our F size most rugged construction. The Eagle is carburetor, which has an intake also available in a larger bore version, diameter of .350, in conjunction with which gives a displacement of .74. This one of the after market pumps on the #26600 FOX EAGLE 4 “ 60” extra displacement makes it possible to market. The rear cover is fitted with a pull a little more propeller. tapped hole to accept a pressure fitting 1 6 9 .9 5 The MK X design carburetor has if you have occasion to use case #27400 FOX EAGLE 4 “ 74” been further refined to give a very pressure for either pump operation, 1 7 9 .9 5 smooth throttling action all the way smoke operation, or some other case from low idle up to full power. The bolt pressure use. The hole for the pressure on cylinder design gives the unique tap is not drilled all the way through. Tb advantage that the cylinder can be m ake th e p ressure tap functional, you turned so that the exhaust faces left, merely remove the rear cover, drill the FOX MANUFACTURING CO. right, or to the rear. This can be hole all the way through with a 1/16" 5305 TOWSON AVE. accomplished merely by pulling the 4 drill, and then install and fit your FT. SMITH, AR 72901 cylinder hold down screws, turning the pressure tap. The thread is a 4-40. PH. (501) 646-1656 cylinder assembly to the desired FAX (501) 646-1757 position and re-installing the 4 screws.

real NASA launch o f a Space Shuttle. The "one-way" drive bearings added, virtually Counter Continued from page 10 new Tracker engines feature a molded eliminate the chance of losing your front nozzle which keeps the electric leads wheel drive, even under the worst con­ smoothly and without drag through the separated and holds the igniter in place ditions. tube. A $249 package contains two 24-inch until the moment of ignition, and then * * * Flex Throttles along with tw o EZ connec­ “ pops-off," assuring reliable ignition every A new muffler, the "Double Snuff," for tors with nylon bolts and instructions. time. The propellant now produces a the Zenoah G-38 and Quadra 35 engines, Ceez! Where was this stuff 20 years ago! smokey exhaust during the boost and delay is now available from J'Tec, 164 School St., * * * portion of flight for more realism and Daly City, CA 94014, phone (415) 756-3400. easier tracking during flight. The rocket Superior Props, 2412 Tucson Ave., Pen­ The m uffler consists of a special cast kits feature molded plastic fins that plug in sacola, FL 32526, phone (904) 944-1972, aluminum manifold and two “ Snuf-Ler” for accurate alignment, an ejection baffle offers machine-cut balsa freewheeling mufflers. It bolts directly to the engine with system to prevent burning of the recovery props from four to 12-inch diameters, and bolts provided, and total weight is 12-1/2 system, pre-cut fabric parachute with tie- can be ordered in any pitch specified, or ounces. This m uffler system reduces en­ on shroud lines, color-coded parts, and w ith a standard 1.3. They come 90% fin ­ gine noise, has a lower tone, and does not three interchangeable engine mounts to ished. Only sanding and finishing, and affect engine rpm. Available at hobby allow choice of engine for different flying preparing the center hub with prop shaft shops or direct. When ordering, specify conditions and altitude desired. hook is required. They can be made of soft engine to be used. Price is $59.95. * * * or hard balsa, and are true helical pitch. * * * Name your poison. Associated Electrics, 3585 Cadillac Ave., D.G.A. Designs, 135 East Main St., Phelps, * * * Costa Mesa, CA 92626, phone (714) NY 14532, phone (315) 548-3779, an­ Model Rectifier Corporation (MRC), 850-9342/Fax 1744, one of the leading R/C nounces three new scale plan sets for 1990. P.O. Box 267, Edison, NJ 08818, phone (210) car manufacturers, now offers the Jaguar The Funk B-85-C is in quarter scale. Span is 248-0970, contact Fred Fischer, has intro­ XRJ10,1/10 on-road car. Its good looks and 105 inches, wing area is 1500 sq. in., and duced a complete new line of rocket prod­ lap times to match make it a real winner. power recommended is a 1.20 four-stroke ucts, sixteen in number, called "Concept For 4WD off-road where efficiency is engine. Flying weight is in the 18 pound II." The main themes of the new products the name of the game, Associated offers range. The model design features plug-in are increased performance and realism the Yokomo YZ10 Fine-Pitch Belt and Pul­ wing panels. Plans are on two rolled sheets, along with ease of proper construction. ley Kit (#ZC650S). Fine pitch belting is the shipped in a sturdy mailing tube, along One of the key elements in Concept II newest craze, and this kit comes complete with a building booklet. Price is $25.00, products is the FX Engine. It is used to with front and rear fine pitch belts and postage paid in the US. create pre lift-off smoke for an added level matching drive and differential pulleys. The other new release is the Clipped of realism. The ability to ignite the FX En­ Allowing you to use most any after- Wing Taylorcraft, available in two sizes; gine first allows the rocket to sit on the market spur gear available today, including 76-inch span and 61-inch span. Recom­ launch pad for up to seven seconds just the new Associated 48 pitch spur gear, the mended power is 1.2 four-stroke for the billowing smoke, then igniting the primary Yokomo YZ10 Spur Gear Adapter with larger, and .61 four-stroke for the smaller. engine to boost the rocket aloft just like a Double One-Way Bearing (#ZC641G), with Both are designed for a one-piece wing for

70 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER SOLID GOLD QUALITY

The term "Solid Cold" immediately brings to mind the image of quality. Similarly, in R 1C helis, quality is immediately associated with the name X-CeK At Miniature Aircraft USA, our primary emphasis is on quality. We demand "Solid Cold" performance in our products. Our service, sales staff, and technical support are all worth their weight in gold — all dedicated to insure your success.

1001 X-Ccll 60 Series Don’t settle for less than Solid Gold 1003 X-Cell 60 Custom Quality! Select an X -C ell Helicopter. 1000 X-Ccll 50 Scries 1008 X-Ccll 30 Scries 1009 X-Ccll 40 Scries 1004 X-Ccll Long Ranger Custom 2515 Long Ranger Fuselage Kit 1002 X-Ccll Quicksilver Custom m iniature a ircra ft (M ® 2500 Quicksilver Fuselage Kit 2324 North Orange Blossom Trail 1010 .40 Size Augusta Fuselage Orlando, Florida 32804 Phone 407-422-1531 · Fax 407-6488609 The 13th edition of the RADIO CONTROL BUYERS GUIDE is available at your hobby shop or order direct from Kalmbach!

Now you can own the source book of radio control modeling information - the RADIO CONTROL BUYERS GUIDE! In more than 300 pages, and thou­ sands of product listings, this all-new 13th edition of the RADIO CONTROL BUYERS GUIDE provides the up-to-date information every radio control en­ thusiast needs - whether you're a beginner or a NATS champion. There's no other R/C book source like it! #12086

• Aircraft · Cars · Boats · Radios · Engines • Hardware · Books · Videos · Finishing materials • Accessories · R/C dealers · Plus much more!

$ 1 2 .9 5 ORDER TODAY!

Kalmbach Publishing Co., P.O. Box 1612, Waukesha, Wl 53187

YES! Please send m e______copies of the RADIO CONTROL BUYERS GUIDE! P rice per copy is $ 1 2 .9 5 /# 1 2086.

□ My check is enclosed. □ Charge my credit card Charge to: □ Mastercard □ Visa

Name______Card # ______

Street------Exp. d a te ______

City, State, Z ip ______Signature______Include lor postage and handling: U. S. $1.50: Canadian and foreign add 15% (minimum $3.00). Make payment in U. S. funds Wisconsin residents add 5% sales tax 0105

quick assembly at the field. Plans and in­ The stabs are all-flying elevators (not ele- crash. Streamers are usually seven times structions for the sport scale T-Craft are vons like the full-size F-14), and it has aile­ the m odel’s span, and in spite of its length, shipped rolled. Prices are $25 and $21 re­ rons for simple two-channel operation. It the model hardly knows its there. spectively, postage paid. · comes with complete hardware. Aerobatics are second nature to these The T-tail model also pictured is the combatants, but the large stabs give Chee­ R/C Soaring Continued from page 13 Celerity Aerotechnical Designs “ Spridget." tahs amazing stability too. Their fuselages This kit is likewise machine sanded from are rotationally heat molded polyprope- Sand them if you want, paint them if you balsa and Lite-Ply and comes with com­ lene. They are nearly indestructible and want, draw panel lines on them with a plete hardware. The Spridget is unique in come in a wide variety of colors. The black felt-tip pen, or just fly them as they that you get two wings in one kit, with the wings and stabs are chromecoat (glossy are. Kids love ’em plain! They cost only option to make the model with a T-tail or white cardboard) covered white foam about $5.50 to $6.50 depending on the size V-tail. The slope wing is intended to be cores, and are cheap enough to be con­ and sophistication of the model and are built at 36 inches with ailerons. It features sidered disposable, even though they are available at your local hobby shop. Hobby the popular Eppler 374 airfoil. With micro easily repaired with five-minute epoxy if shops can get them from Global Hobby servos, three-axis control is possible broken. Replacement parts are easily ob­ Distributors, 10725 Ellis Ave., Fountain (A/E/R), but with standard size servos, only tained factory direct. These features make Valley, CA 92728-8610. two (A/E) can be made to fit. The polyhe­ Cheetahs excellent slope aileron trainers. That large F-14 Tomcat hanging over the dral wing can be built up to 52 inches in Quickly, the specs for the Cheetah and CAD booth in one of the photos is called span (or shorter), and it features the tried- Super Cheetah (in parentheses) are: wing­ the War Wings “ Tomkitty." This one is and-true Eppler 205. This wing is best for span, 48 in. (64); wing area, 432sq. in. (4%); radio controlled! As a PSS model, this one training, flying over slope, hi-start, or as a flying weight, 32-34 oz. (34-36); wing load­ is different than most in that it is much hand launch thermal ship. The list price for ing, 11 oz./sq. ft. (10.45); fuselage length, lighter and cheaper than typical PSS’ers. It the Spridget is $35.00. 35.5 in. (35.5); stab area, 105 sq. in. (105). only weighs 21 ounces ready to fly with CHEETAH MODELS Contact Bob or Larry by w riting 14725 micro radio gear, and it only lists for $55.00 Larry and Bob Pettyjohn have been at Bessemer Street Unit B, Van Nuys, CA (discounted for less than this!). Don’t worry war fo r years. I mean, they have been pro­ 91411, or by calling (818)781-4544. about penetration, because the prototype ducing slope combat models for years. This CLIFF HANGER MODELS has been flown with 16 ounces of ballast in father and son team can get you set up Featuring nine power scale slope (PSS) 55 mph winds at Torrey Pines, and there is with a nearly indestructible Cheetah or models and one non-scale aerobatic room for more ballast than this! In light Super Cheetah slope ship in short order. model called the "C liff Hanger," Cliff winds, leave the ballast out and just zip Cheetahs are designed for darting Hanger Models is one of the biggest, if not around! around the slope without a care as you the biggest source for this genre of sail­ The Tomkitty spans 46 inches with a total pursue your opponent across the sky. The planes. The nine are all basically the same lifting surface area of somewhere near 530 idea with slope combat is to cut your op­ as far as what you get: fiberglass fuselage, square inches. It is an all wood kit. It has ponent’s magnetic recording tape streamer foam cores, all wood required, and all for machine sanded balsa parts throughout, w ithout crashing into his plane. Positive the same price: $89.95 list. (Dealer dis­ with only a couple of Lite-Ply bulkheads. points for the cut, negative points for the counts are available for bona fide dealers.)

72 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI MODEL BUILDER THE TEAM DOES IT IN THE DIRT. oil-filled racing shocks. These custom Associated Race the car that beat the shocks use machined alloy cylinders and custom racing drill blank shafts for silky smooth action. imports in the toughest kind of shocks off-road compefition. Rugged, yet light, the suspension gives you oN the adjustability of full size, full race The All-American Associated Competilion RC10 took home the gold in modular buggies. The A-arm/Ball joint design allows both the ROAR and ORRCA precise camber, caster, ride height and National Championships spring rate tuning. Even anti-roll bars Our RC10 turned back the and a VoriLok dif are included. foreign car invasion with the Exceptional ground clearance and same racecar technology that low center of gravity also contribute has kept Team Associated on to the superb balance and perfor­ top of the RC car racing world mance of the RC 10 over all types for over 15 years. of terrain. T6 aircraft A RACE CAR, NOT A TOY. aluminum GET THE JUMP ON THE COMPETITION. Sure, you've heard that before. monocoque tub Go RC off-road racing with the But Teom Associated designs leaders. The National Champion and engineers only model RACE cars RCIO is available nowand legal for The new RCIO features fully adjustable, four skid plate ROAR and ORRCA nationally sanc­ wheel independent suspension, an aluminum independent tioned competition. alloy monocoque tub and race-proven hardware suspension Complete RC10 kits, replacement throughout. parts and spares are readily available through And the RCIO doesn't need expensive model car racing's most extensive dealer accessories and modifications to handle the network roughest tracks. The strength and durability is Take the challenge ond build yourself a winner. standard equipment. Team Associated's RCIO. Sealed gearbox VoriLok RACE-WINNING ENGINEERING. differential For maximum traction Smooth undercarriage the RCIO suspension maximum ground clearance is damped by long throw.

Model cors tor Reol racers. Full race rear suspension includes bulletproot halt shott and u-joints with tapered and Associated Electrics keyed modular wheels. Quick release knock 3585 Cadillac Ave., o il design tor fast pit work and tuning. Costa Mesa, CA 92626 (714) 850-9342

0 1984 Associated Electrics AVIATION ARTS GALLERY

“CORSAIR IN THE GROOVE” “DOUBLE TROUBLE" By STAN STOKES By RAYMOND WADDY

Full color limited edition lithograph signed Full color limited edition lithograph, signed and numbered by the artist, this piece is and numbered by artist. Also signed by framed in anodized black metal and Chuck Yeager and Bud Anderson. Framed matted with double cloth mats. It mea­ in black metal and double matted, this piece sures 36x52 inches and sells for $435.00. measures 19x22 inches and sells for $169.00. AVIATION ARTS GALLERY 533 S. Coast Highway, Laguna Beach, CA 92651 (714) 494-4303 / 11 to 5 Daily

Phone orders accepted - MasterCard - Visa and American Express - Checks. Free black and white catalog available. Unframed artwork also available.

Completely built and painted models, thick) foam core, all wood required, and Ave., Santa Ana, CA 92705. ready for your radio installation, are also some hardware. D C U M O D E L S available for $250.00 factory direct. Quickly, the specs are as follows: A-10: DCU’s Mark and Sheryl Hambelton The models you may choose from are: wingspan, 49 in.; wing area, 361 sq. in.; were present at the IMS with many new F-5E Tiger II (38-inch wingspan, 31-fuse­ MiG-23: wingspan, 45 in.; wing area, 315 offerings. For slope or thermal flying there lage, 28-32 oz. weight), P-40 Warhawk sq. in.; A-4: wingspan, 43 in.; wing area, is the new DCU Windstar I or II. Sharing a (44/29.5/28-32), KAI-IOZero (44/28/28-32), 266 sq. i n. The price for these models is the common epoxyglass fuselage with remov­ F8F Bearcat (46/30/34-38), F4U-1A Corsair same for all, $114.95 suggested retail, with able nose cone and airfoil-matched wing (50/31/32-38), P-51D Mustang (44/29/ some mail order houses selling them as saddles, the Windstars are quite attractive. 28-32), F-20 Tigershark (42/35/28-32), T-6 low as $74.99 each. (Combat models sells Shown in the hands of its creator, Mark, Texan (44/28/28-32), and the all new F-18 directly only to dealers.) is the Windstar I with its slightly tapered, Hornet (42/34/32-36). All models use COX HOBBIES V-dihedral, European style slope racer two-channel R/C control and accept any If you have been searching (in vain) for wings of 68-inch span. It will be available size radio equipment. an inexpensive two or three-channel single with either a Selig-Donovan SD7001 airfoil Call Cliff Hanger Models and ask for stick radio to fly your gliders, your search or 9% thick Eppler 374, at $135.00 direct. Marty or Steve: (213)320-4530, or write to may be over. Introducing the Cox Cobra The Windstar II is a polyhedral version of P.O. Box 9081, Torrance, CA 90508. Send series. These new transmitters are curved the I with a full two-m eter wingspan. It will $1.00 for catalog. Dealer inquiries invited. on the left side and the back side to fit your be available in your choice of four airfoils, COMBAT MODELS hands very comfortably. The Cobra Three including the Eppler 193 (others will be Byron Bruce has not rested on his laurels has a small lever on the back side for the announced later, but I w ould assume the since his unveiling of the all-foam Combat third channel which you very easily oper­ previously mentioned two are among Models F-16 a little over two years ago. ate with your left index finger. The fit is them). It will have a 12ounce wing loading That model touched off the rush in Cali­ fantastic, and all-day flights with these and should be very competitive in thermal fornia for power scale slope (PSS) ships, lightweight radios should produce no contests. and got Byron to thinking let’s expand! fatigue at all. Sheryl holds the popular Stryker, a 50- Now there are three more PSS offerings The airborne pack is also all new for inch span, futuristic slope fighter with the from Combat Models: an A-10 Thunder­ 1990. Gone are the glitches some have ex­ racy looks of a MiG-29 or F-14 and the bolt II ("Warthog” ) attack plane, an A-4 perienced with the old Cadet series radio speed and agility to go with it. The Stryker Skyhawk attack/fighter jet, and a Russian receivers. According to Pat Moore, the has been around for at least a year now MiG-23 Flogger. These differ from the F-16 glitchy Cadets can be easily fixed at Cox, and is a very good seller at California hobby in that they feature balsa built-up fuselages and the Cobras do not have these prob­ shops and mail order houses. It has a flat, and stabs which are easily repaired if lems in the first place. These units are solid jet fighter-like epoxyglass fuselage and broken, are lighter, and are more durable and dependable. They come with two Cox foam core wings of 400 sq. in. area. It than the injected foam F-16. They are micro servos, AA or AAA dry battery box weighs 30-32 ounces and uses full-size faster, more agile, are very aerobatic, and with switch, and new two or three-channel radio gear. List is $99.99 and it often dis­ yet can slow down for easy landings. These receivers. See your local dealer or contact counts to 80-85 bucks, so shop around. models feature a thinned Eppler 374 (7% Cox fora source near you: 1525 E. Warner Sheryl also holds the new "M ic ro fly ”

74 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER prototype. It will be coming out some time edge. Lance-A-Lot wings will be ready for this summer as a small, fast, fun, and inex­ flaps and ailerons. The fuselage is fiberglass pensive sloper. It will have a molded, high and carbon fiber. The stabs are all-flying impact styrene fuselage, 11 oz. flying and solid balsa. NO NOIS weight, 36-inch span, 144 sq. in. area, and Specs for the Lance are: wingspan, 48 have a retail of about $29.95. Just keep this in.; length, 33 in.; wing area, 269 sq. in.; one in the trunk of your car in case you aspect ratio, 8.7:1; airfoil, S3021; and wing find a good slope on a long commute to loading, 10.4 oz./sq. ft. with micro gear. work, etc. Standard size servos will fit, provided a 270 See your local dealer, or contact Mark at mAH pack is used. Prices are: Lance, HROTTLE (714)535-6969,1556 S. Anaheim Blvd. Unit $145.00 and Lance-A-Lot, $190.00 factory C, Anaheim, CA 92805. direct. Glidesigns, 3184 Lynn Ct., Newbury DYNAFLITE Park, CA 91320, (805)498-2491. -MADE OF Mark Smith and company were on hand K&A MODELS UNLIMITED NYLON to give this writer his first trade show sight- Featuring the Mini-I and Kam-U slope ing of the "Apogee” 100-inch thermal gliders and custom foam cutting, K&A is glider. This is your basic thermal duration ready to help you get airborne. Designed -OPERATES and spot landing type aircraft, of the type for advanced fliers, these two models are SILKY SMOOTH that you will find on any Sunday at a local capable of all two-function aerobatics us­ soaring field. Apogee is not a trainer, al­ ing aileron and elevator. Low price helps -USES SMALLER though it is not difficult to fly. It is more of keep these models standing out in a crowd. THAN NORMAL an intermediate sailplane for a modeler of The M ini-I has a span of only 28.5 inches, some experience. an area of only 167.5 sq. in., and a flying SERVO The kit features quality die-cut balsa and weight of only 9.5 to 10 ounces. Mini radio Lite-Ply, hardwood spars, full-size plans, gear is required. Price is $34.95. -HEAT BENDABLE comprehensive building instructions, and The Kam-U is the bigger of the two and hardware. The Apogee has a Schuemann is for intermediate to advanced fliers. Its inspired multiple swept leading edge, span is 50 inches, area is 287.5 squares, -CONFORMS TO polyhedral/rudder for roll control, spoil­ flying weight is 19.5 to 20ounces,and stan­ ALMOST ANY ers, and all-flying stab. Its biggest feature is dard radio gear does fit. Price is $59.95. : u r v e its price: $59.95 suggested retail, often Both kits come with complete hardware, discounted as low as 40 bucks. See your include machine cut balsa and ply parts, dealer today. foam core wings, full-size blueprints, and -CAUSES NO RADIO EZ SPORTS AVIATION written instructions. Contact K&A at 5990 INTERFERENCE:.. The "Lota 1700E” made its West Coast C alifornia Ave., Long Beach, CA 90805, show debut at the IMS. This model, adver­ (213)428-5423. tised as "simply the best," is one of the PECK-POLYMERS (INCLUDES 24 0 simplest to build and fly ARF electric sail­ Although not new as a design, the THROTTLE AND 2 EZ planes on the market today. Having flown "Genesis" by Keith Schwemmer is now a CONNECTORS) three of them to date built by three differ­ new kit! It’s been worth the wait for this ent modelers, I can vouch for its good unique, lightweight flying wing, however. 60K95 NO NOISE" FLEX manners in the air. It is easy to fly, and its The Genesis is a two (elevon) to three THROTTLE $2.49 climb and glide are up there with the best (elevon-rudder) channel, hand launch, motorgliders on the market. slope, or hi-start thermal ship. It flies very Features include prebuilt, precovered, well due to its light wing loading which is a four-panel, Eppler 195 airfoil, fully sheeted result of its open wing structure. polyhedral wings; built and covered sta­ Specs are: wingspan, 59 inches; area, 346 bilizers; one-piece, Tufflex molded fuse­ sq. in.; weight, 10-12 oz.; radio, standard lage; clear canopy and pilot figure; com­ two or three-channel receiver, micro plete hardware; high power ferrite motor servos. The kit comes complete with full- with ball bearing and stator ring; folding size drawings, instructions, die-cut balsa, scimitar shaped prop with spinner; and ply, and hardwood, and full hardware. apply-it-yourself three-color graphics. Three different radio setups are shown in The going price is currently about the instructions: two-channel sliding tray $139.99 which makes the Lota 1700E a real forelevons; radio mixing; and mechanical bargain. Contact your local Global Full mixing using the Du-Bro No. 215 mixer Service Dealer or Hobby Shack (800- (not included). Price is $34.95 from Peck- 854-8471 or 800-472-8456 in California) for Polymers, kit number PP-040. Phone (619) availability. 448-1818, FAX (619)448-1833. GLIDESIGNS ROBBE MODEL SPORT, INC. Newcomers this year are Chris and I photographed the new Robbe "Saphir” Eugene Lovejoy, and their two new prod­ as it hung from the ceiling at the IMS, but ucts are called the "Lance” and the the shot didn’t do the model justice, so I F;. AND "Lance-A-Lot." These are unique little asked National Sales Manager Gordy slope and thermal ships in that their wings Cockburn to send me a studio shot to run are milled from solid balsa using CNC in its place. technology. The airfoil is the popular Selig The Saphir is a model that an AMA ’ dbes/q S3021, and it is not only milled on the out­ thermal competition flier would love, and 1 b rd & f t t ij side, but rectangular grooves are milled it is also a slope flier’s dream plane. This is inside, leaving a bunch of vertical shear possible because it comes in two versions: webs. A bottom sheet caps over these T (thermal) and H (slope)! Plus, the T ver­ grooves and you can’t tell the voids are sion can be built in four different con­ inside. The wing just feels unusually light figurations: a full-house aileron ship, a for solid balsa (which is what it looks like). dihedral-rudder-elevator ship, and both of The Lance wings come ready to cover, these versions as an electric motorglider! sanded to shape, with a hardwood leading It has beautiful, scale-like lines, a long

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 75 VS has the most complete information sheets I’ve ever seen on their sailplanes. I WANT TO TRY THE CHALLENGE urge you to write or call VS and get a hold of one of these sheets, I guarantee you it OF FL Y/NG R/C HELICOPTERS? will be worth your time. VS Sailplanes, 2317 READ ON TO FIND OUT HOW! N. 63rd, Seattle, WA 98103, (206)525-5776. SIGN-OFF TIME DO YOU FLY RC NOW? The mail bag is filling to overflowing. If you have submitted anything to appear in Then for $250, you are ready to fly with GMP's new REBEL . Rebel is | this column, hang tight, next month you’ll the first and only helicopter designed for a standard 40 airplane engine, probably see it! Thermals, Bill Forrey, 3610 an inexpensive 4 channel radio that is small enough to fit in the back I Amberwood Ct., Lake Elsinore, CA 92330, seat o f any car yet large enough for good visibility and stability. Rebel | (714)245-1702 (after 6:30 p.m.). · has several industry first features, including near "hands o f f " fligh t I performance & high quality, rugged, yet simple, construction designed \ to take the abuse o f beginners & keep on flying. For about $75 more, [ Big Birds Continued from page 15 you can add a gyro to speed up the learning curve by automatically I stabilizing the tail rotor which helps you progress faster to sport & [ But how things have changed. Plans and competition helis like the GMP Cobra & Legend. kits of all kinds of Big Birds are available now, as is an amazing choice of large en­ gines. Even in competition, especially the Tournament of Champions, there’s been a trend toward Bigger aircraft because they look and fly better. (I’m still awed by the quality of crafts­ manship I see at the Expo each year. And, as usual, these magnificent looking birds make me feel that everything I’ve done is inadequate. So, my initial impulse is to rush home and wipe the slate clean by elimi­ nating all the uglies hanging in my shop, Send $2 for an illustrated catalog & technical literature. and start creating something worthy. But I don't destroy anything already built Or receive the catalog and our and stay juiced up only until the new plane exciting flight demo video tape for $34.00 is ready to cover and paint—and then the Goftiam Model Products, Inc.. 23961 Craftsman Rd., Calabasas CA USA 91302 (818) 992-0195 devil in me usurps the would-be scale buff that’s trying to get out. Ah, that devil is some sweet-talker. Be­ wingspan of 112inches (T) or 96inches (H), VORTECH MODELS fore I know it he’s made me throw on a it can work light lift (T) or fly an aerobatic Offering two PSS gliders in P-51 Mustang quick and dirty finish and convinces me routine (H), and you get a tough, Robbe and Mitsubishi Zero form, Vortech is on its that "flying is the name of the game.”) Plura fuselage and presheeted foam core way to fame and hopefully fortune. Jeff Unfortunately I had to leave the Expo wings and prefabricated tailplane com­ Fukushima is the man in charge, and he's early Saturday afternoon because my ponents. Full-size plans and detailed in­ got a pair of really slick PSS kits for you. generator belt broke on the way to the structions round out this valuable package. Each kit features epoxyglass fuselage, foam fairgrounds that morning and I had to get Order direct from your local dealer or from core wings, machine sanded balsa and it replaced. And I couldn’t make the show Robbe. Each costs $236.00 list, on sale at hardwood parts, and detailed illustrated on Sunday because it was my son’s tenth $199.95 each. Robbe, 180 Township Line instructions. Each costs $98.95 list, and is birthday party and I promised him I’d be Road, Belle Mead, NJ 08502, (201)359-2115, available direct from Jeff at Vortech, 2032 there. FAX (201)359-1415. For placing an order San Anseline Ave., Long Beach, CA 90815, Anyhoooo ... I did get pix of some only, use (800)527-6223 toll free. (213)594-9365. dandy-looking Big Birds. SLOPE SCALE Specs are, P-51: span, 50 in.; wing load­ BIG BIRD SOCIAL CALENDAR Brian Laird and Paul Masura have some ing, 11 oz./sq. ft.; length, 38 in.; weight, 31 June 28 to July 1: This is the IM A A ’s of the nicest PSS models around! They take oz.; radio, two channels required. Zero: Tenth Annual "Rally of Giants” and one extra time to finish their models in super span, 52 in.; wing loading, 11 oz./sq. ft.; you don’t want to miss because this fly-in is realistic colors, and their efforts pay off in length, 32 in.; weight, 31 oz.; radio, two gonna be held at the EAA’s Wittman Field, extra turned heads at trade shows! The channels required. in Oshkosh, Wisconsin. Besides all the Big models they have to offer are: Me-109, VS SAILPLANES birds, you'll have a chance to visit a great FW-190, Zero, King Cobra, P-51 Mustang, Last but most certainly not least is VS. aviation museum—and don’t forget those Spitfire, and Hellcat. This booth was among the most crowded good buddies you haven't seen for a year Slope Scale kits feature tough, strong, ones at IMS where sailplanes were being or more. one-piece fiberglass fuselages, high density shown. I had to return after the close of Brochures with all the information and foam cores, wing sheeting, precut tail sur­ show hours to get the photo you see with details are available from me or from Les faces, all other wood required, linkages, this report. Unfortunately, with this Hard, 2909 W. Michigan Avenue, Lansing, complete plans, and instructions. The specs U-shape booth layout, not all the models M l 48917, (517)487-0653. are the same for all kits, so here they are: would fit in a single shot. July 14 & 15: The Puget Sound Rocs will span, 46 in.; area, 292-322 sq. in.; weight, Due to the length of this report. I’m be hosting their 8th Annual Big Bird Fly-In 26-32 oz.; airfoil, Eppler 374 (mod.); wing going to have to cop out and say I can’t tell at the Rocs’ new flying field. This Bigger loading, 11.5 to 14.5. The Me-109, FW-190, you in detail about every model in Ken site is just six miles from where the old field Zero, and King Cobra are all $99.95, while Stuhr's booth. There were slope aerobatic was, just south of Rainier, Washington, on the P-51, Spit, and Hellcat are $104.95. See ships galore and even a couple of thermal Vail Cut-O ff Road. your local dealer. If ordered directly from ships present, most of which featured The flyers have all the info and include a Slope Scale, add $4.00 shipping, and 6.75% pivot-wing “ pitcherons” for control where map. You can write to me or Bruce Gale, tax if sold in California. Contact Slope Scale the elevator and/or rudder do not move. 811 9th Avenue S.W., Puyallup, WA 98371, at 12935 Lasselle St., M oreno Valley, CA Many kits featured seamless molded Kevlar (206)845-0705. 92388, (714)924-8409. fuselages, a VS exclusive feature! THOUGHT OF THE MONTH

76 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER e l e c t r ic CITABRIA A great stand-way-off scale fun ship designed for 05/075 electric power

Do take-offs, aerobatics and touch and goes with this classic beauty yet enjoy docile, slow flight for easy landings. Quick and easy to build, the kit includes: pre cut fuselage sides; tail feathers and small parts; step-by-step instructions; complete rolled plans; hardware and threaded rods; formed landing gear and spruce spars with shear webs. 32 oz. flying weight with lightweight equipment.

4 0 ” S P A N 275 SQ. IN. AREA FLAT BOTTOM WING

A great companion to the very popular: «r£JN9E0IKl:S

II a v e y The Electro-Combo includes: the kit; DSC 075 Hyper­ S y st e m s 675 Tower Lane thrust motor, fused switch harness with Tamiya style West Chester. PA 19380 connector; propeller adaptor; and 8/4 fiberglass propeller. ISORPORATION (215) 430-8645

Death is Nature’s way of saying “ Up ounces, ROGs quickly, and left everyone One last item! Lynn Cromer is willing Yours.” in awe as it sliced up the sky. Jaime says and able to start a technical journal for Keep those cards, letters, and photos each motor draws 90 watts, which is con­ electric planes. He would like to cover sub­ cornin’—and newsletters, too. Al Alman, sistent with the high performance. Frank’s jects like computer programs to predict 1910 154th Street Court South, Spanaway, Astro Porterfield is powered by a geared performance, aircraft designs for electrics, WA 98387, (206)535-1549. · Astro 15 cobalt on twelve 1200 mAH cells, definitive methods for determining the and weighs 80 ounces. It ROGs with ease, motor for a given aircraft, and technical loops consecutively from level flight, and information on motors and batteries, plus Electric Continued from page 17 looks good in the air. Frank has advanced any other topics that may apply. The the timing on the Astro motor 15 degrees journal would be non-profit, with as much my own plane. I will try adding about a half and reworked a Top Flight 12-8 prop, as possible done with donated time and to one inch to the nose to see if I can take which turns at 6000 rpm. This is quite ad­ materials. It would be published approxi­ out some of the downthrust. Less down- vanced timing on the Astro motor, I have mately every six months. So, Lynn is asking thrust would give quicker takeoffs and less never done this. Anyone else with experi­ for papers, drawings, programs, or what­ pitch change with throttle on-off. Thanks ence in timing Astro motors? I usually leave ever that would be of interest to the elec­ for the info, Scott. mine “ as is." Lowell Howe won the dura­ tric modeler. You can contact him at 1148 Frank Korman sent photos of the Dallas tion seven-cell glider and Old Timer M t. View, Glen Heights, TX 75115, phone Electric Aircraft Fliers funfly in October. (Naturally! I’ve seen this guy fly! MP). 214-230-0931. I hope Lynn can make a go There were 31 participants with 50 to 60 Spectators came from as far away as Mis­ of this, for as you know, inform ation is the aircraft. The variety of planes was impres­ souri, and with ten members signing up on most valuable item in making electrics sive, ranging from quarter-scale to a Kling- the spot, DEAF is up to 38 members. If you successful. We lack the books that are berg wing. Jaime Colley’s Klingberg wing live in the area, you might contact Frank available in Germany, for whatever reason, was powered by two LeMans AP 29 motors Korman, 5834 Goodwin, Dallas, TX 75206, so perhaps a journal will be able to fill the in parallel to a six-cell 1200 pack, turning about joining a good electric club. Next gap. Till next time, read on, and fly better pusher Cox 6-3 props. The wing is 44 year may be a two-day affair. Thanks, Frank. electrically! ·

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 77 THIRD ANNUAL IMS ★ LIVE INDOOR R/C MODEL CAR and BOAT ACTION ★ HUGE CAR TRACK ★ BOATPOND ★ SWAP SHOP ★ GIANT RAFFLE MAY 18,19, &20,1990 Trade-Only Day, Friday, May 18, 9 am - 2 pm Once again, IMS brings the popular Model Sport & The IMS show, where direct selling to the public by Hobby Show to Atlanta, Georgia, for the pleasure of exhibitors is permitted, brings major model manu­ model enthusiasts all over the great Southeastern facturers from all parts of the United States, as well United States. as Canada and overseas.

See the latest products and visit with major manufacturers and distributors of: • Model Aircraft · Model Boats · Model Cars · Model Engines • Radio Control Systems · Model Railroads · Modeling Accessories

STATIC DISPLAY COMPETITION IN MANY CATEGORIES GEORGIA WORLD CONGRESS CENTER 2S5 International Blvd., NW, Atlanta, GA INTERNATIONAL F R ID A Y , M A Y 18, 1990, 2 p.m. - 7 p.m. S A T U R D A Y , M A Y 19, 1990, 10 a.m. - 6 p.m. MODELER S UN D A Y M A Y 20, 1990 10 a. m. - 5 p. m. ADMISSION: Adults S5.00, Juniors (12 and under) $3.00. SHOW Children under six, free when accompanied by an adult. P.O. Box 10127, Costa Mesa, California 92627-0031 Phone: (714) 548-4700

edge sheets of 3/32 (medium “ A” grain if the grain running crosswise and wrap them Ersatz Continued from page 24 possible). Join the wing panels and glue in around the cowl at the very front, as the 1/8 birch ply dihedral braces at the shown. Sandpaper everything to shape and plete and what you add on top of this is up main spar. Be sure the dihedral is the same separate the cowl tops as shown so that the to you. Follow the plans for a Junkers-like under each tip. Add the vertical grain muffler exit is on this separation line at the top or vary it according to the type of webbing as shown. Glue in the 1/8 ply right side of each cowl. Be generous with model you have in mind. Don’t forget the bellcrank mounts. Be sure to angle them the size of the holes here and on the top 1/4-inch ply blocks for the wing hold on. so the push rods go down to the ailerons for the glow plug so that air can escape for WING and up to the throttles. Grooved landing cooling. In a multi-engined model, the wing gear blocks are well cemented under the LANDING GEAR center section is the heart of the whole center section. Bend up the landing gear as shown. Bind thing, as it must house the motors and the NACELLES and solder it together using the mount on landing gear. On our Ju-37, the wing is The nacelles are now started by gluing in the wing as a jig for alignment. Add the built in three pieces, with one-inch or 4° the 1/8 lite ply nacelle doublers. The short half-inch strips of spruce as fairings and dihedral under each tip at the last rib. The one is outboard on each nacelle, to give sand smooth. center of the wing is then the heaviest and about 4° outthrust, which is single-engine TAILPLANE busiest part of the airplane. insurance that there won’t be any surprise Both the fin and rudder, and the elevator Begin by cutting out 20 ribs from firm snaprolls. These go forward only to the 1/4 and stab are cut from light but firm "C” 3/32sheet. Twelve of these ribs will have to ply firewalls, which are now added. Be grained balsa. The shape given helps the be slightly altered to receive the 3/32sheet sure not to have any up or down thrust on illusion of it looking like a Junkers, but on top and bottom in the center section. the fire walls. Drill the holes in the firewalls change the shape to suit the model you It’s easier to cut all the ribs the same, then for the motor mounts, use either the spider have in mind. Just don’t change the areas. alter them as needed. Use very firm and back plate on the K&B Sporsters or a glass Sand them to shape and sand the leading springy strips for spars and leading edge. filled mount. The center line should be and trailing edges, though I prefer a slightly Careful substitution of spruce would be 3/16 of an inch inboard on each mount so squarish trailing edge because this seems OK. Build the wing on the plan in one that the props emerge at the center line of to keep servo centering from being critical. piece, if you have 48-inch wood, or in three the cowl. The 3/32 sheet nacelle and cowl I inlaid 1/4 ply blocks in the fin and stab so pieces, but be careful that they line up. The sides are glued on, then the tank floor. that I could use screws to m ount them for ribs are flat-bottomed from the spar back, Install the 4 oz. tanks next and sheet top convenience sake. so pin down the 1/4 sq. spar and the trailing and bottom, crossgrained. This should be FINISHING edge sheet and then glue in the trailing faired into the wing sheeting. Cut out two The charm of this model is the scale-like edge stock; the ribs next, then add the top cowl fronts from 1/16 ply and glue them in appearance, so finishing it in a plain color spars and leading edge. Remove from the place. Build up the fronts with balsa as w ith stripes or sun bursts, etc., w on’t do plan and add the 1/8 sq. bottom spar. shown and add the grillstrips from 1/8 x much for it. Keeping in mind that full scale Sandpaper the trailing edge sheets to re­ 1/16 spruce so that air can enter for cooling bombers were painted with spray guns ceive the top trailing edge sheets. Sand the and the carburetor. To make the fronts then that seems the way to go w ith this entire wing panels and add the leading look like radiators, cut 1/8 x 3/8 strips with one. Choose whatever fabric works best

78 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER RELAX. WE CAN FIX IT! rrSASIARH^W K. The first “rookie-to-ace in eight flying days” that is ALSO repairable. RC is suppose to be fun—not terror filled anxious moments. Introducing the first ARF that is truly repair­ able—yet meticulously handcrafted, one by one, using easily repaired balsa and foam construction. Easy to fly the first time.. .easy to move into aerobatics.. .easy to repair.

NOTICE: STARPLWKS are meticulously handcrafted they remain in limited sup­

V ply. See your hobby dealer soon for delivery details.

TM

Thorpe Engineering Corporation

Γ715 East Fairfield Mesa, Arizona 85203 (602)964-1398 ° 1988TECH

Model. Amy I.vnn (iruncuald Make-Up & Hair Vince Fsuicy

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 79 running fairly close to each other. If the rpms are very close you’ll hear a beat. Don’t adjust the needle valves. Try the throttles Needle Files to make sure they’ll both idle. Use a tach if you have one. If they are both running well make sure they are well warmed up, A complete set of 10, then try taxiing around the field to get the jeweler-fine files for every feel of the model. D on't be in too much of hobby and craft use. This a hurry to fly. When you feel everything is needle file set features in order then fly. If anything doesn’t seem round-handled files of tough, tempered steel in right, bring the airplane back to the pits a handy plastic pouch. and shut down the engines and retune Spade, fiat, square, round them one by one. W hen all is in order and and taper files are in­ if your hands aren’t trembling too much, cluded in the assortment. try for a takeoff. Hold the tail down until it Send 25 cents for a gets some ground speed then steer it gent­ complete catalog of hobby ly. Don't hoist if off too quickly. Be pre­ //. and craft tools and ma­ pared to chop the throttles and land terials. K&S Engineering, NEEDLE FILES straight ahead, whatever is there. Climb tf » *^/ Ht>VUO *AVOif 6917W.59th St..Chicago, IL, 60638. Telephone: 312/ out without doing anything too abruptly 586-8503. and get lots of height before trying any maneuvers. My twin will do everything in the book w ithout excessive speed and is as docile as a kitten on landing. The quiet 20s give it the sound of a real twin. Enjoy your bomber and keep them guessing when they ask what real one was. If you have any questions or suggestions for you and type of paint you like to work wet-sand the fabric, etc., with fine wet- please w rite to me, Alex D. McLeod, 352 with. I used Sig Koveral and butrate dope. and-dry paper. DON’T CUT INTO THE Park St. N., Peterborough, Ontario, The finish is only as good as the surface it FABRIC! Three to five sprayed coats of Canada, K9H 4P5. Happy Flying. · is put on. Be sure to rough sand the model thinned color are next. Then mask the to shape with 40 to 80-grit aluminum oxide model and spray or brush on the trim (an paper, or garnet paper, then progressively airbrush for camouflage). When every­ Vintage Continued from page 19 finer paper to about 300. Next, dampen thing is painted, add two coats of clear dull the wood with a sponge but don’t soak it. dope, or shiny if you like, and it’s ready to center of your field. Push and hold full When it's dry, the surface will be raised assemble and put in the K&B 20s and the rudder, and as the model approaches the showing indentations of the rough paper. four or five-channel (if you want bomb downwind heading, neutralize the roll Now sand it again with 300 paper and use drop) radio. with a bit o f opposite rudder. G ee. . . ain’t Model Magic or similar filler to fill all the FLYING it simple when you only have one control dings and hangar rash it acquired while I’ve flown a number of twin and four- to mess with? Like playing a tune on the building. Now sand it smooth with fine engine airplanes and still have my heart in piano with one finger! Now, as the aero­ paper and apply two coats of Sig sanding my throat on the first few flights of each. dynamic forces get to work on the plane, sealer to the bare wood, sanding carefully Not all of them survived many flights. The the nose will come up as it did for the loop, between each coat. Next, two coats of clear problem is engine failure on one side close only now it is going faster. When the nose butrate thinned 50/50 with dope thinners. to the ground and the remaining power of the model is pointing up at about a 30 to When dry, lightly sand it. puts you into an immediate snap. Experi­ 45-degree angle, sock the rudder to it and Apply the Koveral by cutting a piece a ence doesn't help here in flying, just in hold it there as the model goes through a half to one-inch larger than the surface to setting up the engines and designing the 360-degree roll. Get off the rudder just as be covered. Lay it on the surface and care­ airplane. The Ju-37 has out-thrust on the the model has almost reached a horizontal fully brushing thinned clear dope through engines to keep the airplane from turning atitude. When completed, the nose will be it to the framework underneath but only towards the dead engine. This also keeps pointing up again, and you’ll still have a around the edges, all the while pulling out the prop blast on the large rudder for ef­ good head of steam. You now have two the wrinkles, particularly around the edges, fective steering. One 20 Sportster will choices. If this is your first try at a rudder- and moistening the doped edges with the maintain height so that you can bring it only roll, just tap some gentle rudder for a brush if it has to be moved at all. When in home. If an engine quits in a near stall mild turn and allow the model to climb position, let dry and then cut off the excess condition, that’s close to disaster, so don't gradually, killing off its built-up speed. around the edge and dope down the edge fly around too slowly but maintain a good Mission accomplished! Work your way left. If it doesn't flatten out on the edge margin of airspeed on one engine. back upwind for another try. Depending don't worry, because the next step is to use After you are comfortable with the on how the model completed the roll, you a heat shrink iron and run it around the model in the air, try to have one engine cut may want to start the next roll maneuver edge to smooth it out. Now apply more out (up at least three mistakes high) and try earlier or later as the nose comes up from dope over the edges and when dry, use your ability to fly on one. See what happens the dive out of the spiral. Don’t start it too the iron to shrink the Koveral, starting near in a stall, etc., then you’ll know. If you run soon, however! You could find yourself the middle and working to the edges. This into difficulty, chop the throttles and come rolling into the ground. Proceed with helps eliminate the wrinkles. Then smooth in dead stick or on idle. If you keep it light caution. any rough spots on the edges with the enough it’ll glide well. Mine weighs six After you become comfortable with one iron. pounds and has no bad habits. rudder-only roll, you can go for the second Cover the open spaces this way and On your first flight, start the right (star­ choice referred to above as you come out anything else that needs strength. Now board) engine first then tune it up to peak of the roll. If you started far enough up­ brush on many thinned coats of clear and back it off a little. Be sure it can run in wind to complete the first roll before butrate dope. When asked how many; I all positions. Shut it down next and then crossing the center of your flying area, and don’t know, but usually I keep going until I start the left (port) engine and tune it as you still have extra flying speed, wait for can't tell whether it's wet or n o t. . . usually you did with the right. Now restart the the nose to come up to the same angle as well over ten. After about five coats, lightly right engine and listen to see if they are before, and punch rudder again! Now

80 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER Learn why the best lessons in electric R/C are taught by old-timers.

Building and flying a Leisure Playboy or Lanzo Bomber Old-timer can teach some valuable electric R/C lessons. Like building light. Fundamental to good electric flight performance is a lightweight airframe. Leisure's Playboy and Lanzo Bomber Old-timers both feature lightweight airframes that combine powerful takeoff and climb capabilities with minimum sink rates - for long flights and slow landings. Another lesson is how to build-in stability for easy flying. Consider that the original Playboy and Bomber designs started out life as free flights. Our two old-timers fly hands off too. That's why they really do make the perfect R/C trainer. Maybe the most important lesson the Leisure Playboy and Bomber Old-timer kits can teach you is how to open up and keep more R/C flying sites. You see, because they’re electric powered they’re practically silent. You can fly them almost anywhere, anytime. See your local R/C hobby dealer and pick up a Leisure Playboy or Lanzo Bomber kit and an inexpensive Leisure 0. flight system. You’re in for some good lessons - take it from an old-timer.

For more irrformation on the Leisure Old-Timer KUs. motors. N iCd batteries, charters and other accessories send a stamped, seif addressed business sized envelope to: Leisure Electronics, L eisu re 22971 Triton W a y.U n iiB . Laguna Hills, CA 92 6 5 3 .

you re on your way through two sequential some time now I’ve been itching to use my barrel rolls and you re already thinking, hot Rossi .40 ABC engine. I just love this partment was enormous, so I guess I kind Next time, I m going further upwind be­ engine, as it is very powerful, idles beau­ of went overboard when I installed a fore I start the spiral, and go for three rolls tifully, and starts easily. Though I’ve had it fourteen-ounce fuel cell. What the heck, I ... maybe more.’’ Fine ... go for it, but if for about two years, it didn’t have more could fill it at home and forget about it for the rest of the day’s flying. the wind is blowing very much, it’ll be a than an hour of running time, because the long hard struggle getting back upwind muffler furnished with the engine is, in my Now I turned my efforts to the fiberglass cowling, an example of authentic overkill. after you decide to stop rolling . . . unless opinion, totally worthless. It is little more While an ABS cowling would have done you cheat and feed in down elevator for than a straight pipe which causes the Rossi the job quite well, the manufacturer for better penetration! to give forth an ear-splitting scream. I find some reason saw fit to furnish a heavy-duty Another trick that rudder-only fliers this totally intolerable, and it never fails to learned back in the old days for working cowling of what appears to be hand-laid bring down the wrath of my flying com­ fiberglass. This is nicely primed and ready their way back upwind, particularly with a panions. After just a few flights with this for painting, so after cutting the proper good aerobatic ship, was to roll upwind! muffler I knew something had to be done, opening for the Rossi I sprayed on a few One New Jersey flier, Vince Bonnema, was and while I was thinking about the prob­ coats of Formula U yellow, ending up with especially skilled at this with a rudder-only lem, one day the muffler shook itself to a nice glossy finish. I did have to furnish the contest ship of his own design, which he pieces. I then took what was left of the pushrods, control surface horns, clevises, appropriately named “ Rollo!” It was pub­ muffler, cut it in half, and attached a J’Tec etc., as very little hardware comes with the lished in Air Trails and we have the full-size Snuf-ler M uffler, which cut the noise back kit—just the landing gear, the nosegear plans. to a reasonable level. However, I felt I bracket, and a few screws. Next time, we’ll combine the loop and wasn't making enough use of the Rossi's As the model approached com pletion, I roll maneuvers to talk you through an potential power, so I had a talk with the was becoming more and more impressed Immelman, sometimes referred to in the folks at MACS Products. It took them about with the quality and sturdiness of its con­ old days as an "Im m elflounder!" In the thirty seconds to solve my problem. They struction. There was a lot of thick balsa meantime, keep them elevators, ailerons, had me install one of their #2600 standard used in the fuselage sides and the tail sur­ and throttles locked u p ... and suffer, like header pipes and a #1835 Wizard short faces, and this was a model which obvious­ the rest of us idiots who flew radio control tuned exhaust. This gave me three distinct ly could take a great deal of punishment. in the vintage radio control days! · advantages: it effectively quieted the en­ Since I fully intended to put the screws to gine, upped the power by at least 25%, and this airplane, I installed fiberglass pushrods gave my Rossi a really businesslike ap­ for maximum rigidity during high speed A R F s Continued from page 26 pearance. Using a Hayes mount (not sup­ maneuvers. Completed weight was 5-1/4 plied with the model), the engine slipped pounds, so the wing loading computed powerplant. The engine compartment was easily into the engine compartment with out at about 21.5 ounces per square foot, a amazingly spacious, and I could have in­ enough room left over to stash a sack of reasonable figure for a sport plane. stalled any engine I pleased, up to and peanuts. Though I usually use a ten-ounce Flight test day was sunny and calm, so I got the Rossi going and taxied downwind including any .60 two or four-stroke. For tank w ith a .40 engine, the engine com ­ ΉΕΝ CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 81 MAY 1990 turn your printer Into an airfoil plotter with... I lost a beautiful airplane the other day, IMPORTED DIESEL ENGINES and though it was a disastrous crash, it FOILED AGAIN!! need not have happened at all. I w on’t mention the name of the airplane, because Current production: Aurora, it was no fault of the manufacturer, and it wouldn’t be fair to give anybody the wrong • PLOT AIRFOILS IN ANY CHORD TO 24 INCHES Cipolla, D-C, Enya, KMD, MAP, idea. I will go so far as to say it was a pretty • MODIFY THICKNESS. CAMBER. TRAILING EDGE Mikro, MK-17, MVVS, OTM, PAW, • PLOT SKIN THICKNESS FOR SHEETED WINGS hot performer, and flew much like a Pat­ • ENTER DATA EASILY WITH BUILT-IN EDITOR Pleffer, Silver Swallow & USE Die­ tern ship. I had been flying the model for a • EASY TO USE, MENU-DRIVEN OPERATION • INCLUDES AN 18-PAGE ILLUSTRATED MANUAL sels. Also Mills and Taplin Twin couple of weeks, and was quite confident replica diesels and very special in its flying ability. During one flight my son Gary asked to fly it, so I handed him CQO QC CA rnM tnti imported glow engines and C02 add i t la· Ovaraaaa order· the transmitter. I requested that he main­ bank d ra ft fo r UftSSO Motors. Catalog — $1.00. Require» IBM com patible tain a high altitude until he felt thoroughly computer and dot-matrix printer. comfortable with the airplane. After three Plaaaa opacify computer and or four minutes of high speed aerobatics I printer type «ban ordering. CARLSON ENGINE IMPORTS Sand check or money ordar to: 814 E. Marconi, Phoenix, AZ 85022 noticed he was flying low over the field, so CYGNET Software I asked him to get it up high again. He 24843 Dd Prado #141 Dl managed to regain some oif his altitude graduate from a high wing trainer would and remarked that the plane seemed to be on the paved runway. Full throttle and she enjoy flying the Shark-ST. As far as as­ in need of a lot of up trim, as it just didn’t was accelerating forward on a perfectly sembling this model goes, I put a lot of want to maintain altitude. We fed in all the straight path, the engine turning up full time into it, but I worked quite slowly and up trim we had available, but still the model revs on the 10x6 Master Airscrew and the kept setting it aside to tackle other projects. wanted to descend, so it was decided to mini tuned pipe. Boy, this was going to Asa matter of fact, I think I could have built land immediately. At that point elevator leap into the air like a tiger, so I braced up an entire conventional model in the control was suddenly and completely lost, myself and applied a little up elevator. same time, but remember that I spent two and in the resultant crash the model was a What's this? A gentle climbout? Medium or three nights just on the MonoKote ap­ complete loss. speed? What’s going on here? The Shark- plication. I think the average builder will As much as I regret any flying mishap, I ST really was flying like an intermediate put a solid week of evenings into the am especially annoyed with an unex­ trainer, rock steady and with predictable Shark-ST, but the time is well worth the plained crash. If the pilot does not deter­ responses. W ell, I w o n 't say I was disap­ results. You end up with a straight and mine exactly what were the circumstances pointed, just surprised. The Shark was a lot sturdy airplane with fine flying qualities. which caused the problem, then nothing of fun to fly and could do everything in the Pricewise, the cost of producing a hand- was learned about preventing it from book, but it was no Quickie 500. It rolled built model such as this is comparable to happening again, and this compounds the nicely, flew inverted with authority, and the average ARF. Beginning with a direct tragedy even more. Therefore, one must especially excelled in snap rolls and spins. mail-order price of $89.95, you do have to exert every effort to determine what went Knife-edge flight was quite good because add the cost of miscellaneous hardware, wrong, much as the FAA does when it of the generous fuselage side area and the motor mount, spinner, wheels, adhesives, conducts minute investigations into the large rudder, and slow flight was extra slow and fuel tank, to say nothing of some kind cause of a full-scale accident. with no danger of dropping a wingtip while of covering material or paint. This can easily Accordingly, all the larger pieces of flying on the edge of a stall. It was kind of add another $40 or so to the basic airframe wreckage and even the fragments of the like a cleaned-up Ugly Stick, and I have cost, so do keep all this in mind should you airframe were carefully gathered together every reason to believe that it was thor­ decide to build a Shark-ST. For further in­ for a post-mortem examination. In this case oughly flight tested by the manufacturer formation about this product, contact it was evident that the crash occurred be­ before being placed on the market. I Kingsway Enterprises Imports, 4901 Rich­ cause elevator control was lost, and this couldn't find any bad habits, and managed mond Ste. 200, Flouston, TX 77027, tele­ may have been due to a number of cir­ to achieve a much snappier performance phone (713)621-7782 in Texas, or (800) cumstances. First, structural failure was after I increased the control surface throws 621-7783 outside of Texas. considered, but the horizontal stab was substantially. Any R/C flier who wants to ONCE UPON A CLEVIS found to be intact, as were the hinges and

82 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER G/fnnounc&mznt: SOME MANUFACTURERS OFFER TO BACKUP THEIR KITS WITH A GUARANTEE THAT STILL COSTS THE CUSTOMER A 10- 20% RESTOCKING CHARGE WE AT YELLOW AIRCRAFT ARE PROUD OF OUR QUALITY AND SUPORT THIS WITH A 100% SATISFACTION GUARANTEE WITHIN ONE WEEK OF PURCHASE OF ANY YELLOW AIRCRAFT KIT. IF YOU ARE NOT HAPPY WITH THAT KIT SIMPLY RETURN IT TO US UNALTERED AND WE WILL REFUND 100% OF THE PURCHASE PRICE THIS IS YOUR ASSURANCE OF QUALITY IN EVERY YELLOW AIRCRAFT KIT. THIS IS NOT A NEW GUARANTEE BUT SIMPLY A WRITTEN STATEMENT TO SUPPORT WHAT HAS BEEN VERBALLY STATED MANY TIMES IN THE PAST. Specifications Length 59" C a p -10B Wing span 75" Weight 14-17# U4 Scale $ 2 6 0 . 0 0 u s Designed for Supertiger 2500-3000 or OS Max 160 4-cycle twin, joined fiberglass fuselage, elliptical balsa presheeted foam core wings, bulkheads and firewall installed, clear canopy, prenotched aileron location, balsa filler blocks, plans and instructions. French Connection Docali shown are optional at $30.00. F- 4E Phantom II Specifications Length 68" F- 16A F a lc o n 1110th scale $ 3 1 5 . 0 0 US Wing span 44" 1 /9th scale $280.00 us Weight 9-11# Features: Fiberglass Fuselage (with panel lines) Pre sheeted (balsa) foam surfaces Fiberglass ducting (intake and exhaust) Clear canopys with ABS cockpit floor Precision precut plywood formers YELLOW AIRCRAFT & HOBBY SUPPLIES, LTD 11919 Canyon Road E. Puyallup, WA 98373 USA (206) 845-8195

*plus shipping 3040 Palstan Road Suite 201 Mississauga, Ont L4Y2Z6 COD Or Prepaid Accepted Also tviilible from: Florwtx. Hobby C«itw. Inc 4 20 W.rf SR434. Winter SpHne.FI 3270S (407)327-6353 the elevator. The elevator servo was oper­ from the parting of the clevis and pushrod. "This means you get more turns on the ating normally. However, it was easy to What’s the moral ot this tale, and what FAI Tan rubber and the higher energy is spot what really happened, as the clevis does it have to do with ARFs? Well, this contained in the cruise portion of the was firmly attached to the elevator horn, particular model was not an ARF, so the curve. The additional winding potential of but it had parted from the threaded push- pushrod came from my parts box. Origi­ the FAI Tan rubber is particularly notice­ rod. Now my thoughts began to turn back nally the pushrod was an extra which came able with repeated windings on the same to the many times I had deliberated and with an ARF, but it would be impossible for motor. agonized over the choice of metal versus me to determine which one it came from. "This all sounds great, but successive nylon clevises. In this case the clevis had Suffice it to say that the threads were not windings on the same motor, w ithout rest, been metal, and I have always preferred cut, but must have been impressed on the does lead to early motor failure. True this type, though many modelers lean rod, resulting in an inferior type of thread. enough, all rubber motors will fail under toward the nylon variety. Those who have W hile the thread was too shallow to mesh these conditions, but the FAI Tan rubber is been flying R/C for many years generally correctly with a metal clevis, it probably particularly prone to failure with repeated stay away from metal clevises, as we were would have worked satisfactorily with a low-turn winds!” frequently cautioned to avoid the type of nylon clevis, as the nylon clevis becomes To summarize the findings (without get­ radio interference resulting from metal- tapped and mates correctly to any ting into too many more paragraphs), Wale to-metal contact. However, today’s radio threaded rod. To be fair, ARFs are usually concludes by theorizing that the Tan rub­ systems seem to have conquered this prob­ furnished only with nylon clevises, so you ber suffers from inadequate lubrication. lem for the most part, so I favor a spring could say the accident was e ntirely my The FAI Tan rubber appears to absorb very steel clevis where strength is necessary. fault. Therefore, in my opinion, one should little lubrication, resulting in small edge Anyway, as I was driving home from the never use a metal clevis on a pushrod nicks which lead to catastrophic failure. field I got to thinking about why the clevis which comes in a kit. If you do decide to The possible solution here is to use a slipped off the threaded rod, and I realized use a metal clevis, buy a properly threaded more viscous lubrication which will not fly that perhaps it was not the fault of the name brand pushrod to go with it. And off the motor. This writer has successfully clevis, but of the rod. Sure enough, with that, dear readers, is our lesson of the used a heat resistant silicone base lubricant the defective parts lying before me on my month. Meanwhile, send your letters as known as “ Sil-Glyde” that is normally used workbench I tested the clevis on a good usual to 2267 Alta Vista Drive, Vista, CA to preserve and restore vinyl base seat quality American-made threaded rod and 92084 (SASE for reply, please), telephone fabrics. In the last analysis, rubber should found it to be in perfect order. I then (619)726-6636, or FAX (619)726-6907. · be checked for proper lubrication and the screwed it onto the suspect rod from the motor properly rested. deceased model, and found that it slipped Unlike other lubricants, the silicone off with a firm tug. I then examined the Sparks Continued from page 36 based grease material does not separate threads of the rod under an optical loupe appreciably from the motor, saving the and there was the answer to the mystery. It curves the FAI Tan rubber has a flatter covering and wood framework from be­ seemed that the threads were quite shal­ cruise portion. Both curves for Pirelli and coming disfigured from lubricant spatter. low and did not mesh properly with the Tan rubber show similar spike and knee Sil-Glyde is available in most auto parts female threads of the clevis, so that after a curves, but the tan curve extends well be­ stores. dozen or so flights the disaster resulted yond the other makes. READERS WRITE

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI 83 over other models flown by such notables as Frank Zaic and Alfred Van Mymersh. FREE The model does feature a carefully stream­ A SUPER STAND CAN... lined fuselage, twin rudders, and a single H obby Lobby’s leg retracting gear. When flown with War­ ren's expertise, the model was a first class NEW! performer.” MORE READERS WRITE As noted before, this section of the col­ CA T A L O G 1 5 umn is getting to be the most popular with modelers wishing to have photos of their i s H E R E ! models published. We are delighted to do this with the proviso that the photo should NEW our first F3E be clear and capable of good reproduction Electric Sailplane in the magazine. NEW Key West One great thing is the variety of models fast electric boat, received, as evidenced by Photo No. 14 NEW hot electric boat outdrive, showing the Fiske Hanley 1937 Texaco NEW electric motors with updated Winner by Al Wolsky, 41890 E. Whittier, performance data, Hemet, C alifornia 92344. This 9-1/2 foot BE USED FOR—FIELD model is powered by a Webra .61 con­ NEW "Pink” that finds thermals, · · verted to spark ignition. Al reports the NEW 2-wheel drive cheaper MAINTENANCE CARRIER BUILDING/ALIGNMENT JIG · model flies great and likes Old Timer Hunter car, models because of the unusual designs NEW unusual boat and plane PAINTING JIG · STORAGE that are available. hardware, STAND · KORDA WAKEFIELD NEW RC sailplanes. . . Every so often we have to run a shot of COMES COMPLETE WITH the famous 1939 Wakefield winner as flown BUILT-IN TRAY AREAS. by Dick Korda at the Chicago Nationals. AVAILABLE AT YOUR LOCAL Mark Sexton, of Seattle, Washington, sends in Photo No. 15 depicting a Dick HOBBY SHOP. Korda Wakefield as kitted by Megow. The finish is entirely as Korda had it, a red silk CCCXIlQ covered fuselage with the authentic Dick Korda trim pattern done with black nitrate P.0. Box 1247 dope. St. Charles. IL 60174 Mark reports the model flies reliably with considerable promise to be a com­ petition threat. Now if the model can just As has been proven time and time again, stay out of the downdrafts! Old Timer models have proven to be THE WRAP-UP among the best subjects for electric pow­ Maybe this section should be entitled, ered flying. Marc Bird, of Oceanside, Cali­ “ Stop the Presses.” Just received a phone fornia, sends in Photo No. 12 with the call from Jim Adams, SAM President, who comment that he gets two to three flights called to confirm the dates for the SAM on a charge. The model appears to be a Champs at Westover AFB, Springfield, Call us at (615) 373-1444 scaled "Miss Delaware” or the follow-on Massachusetts. or send the order form. "A ir Chief” kitted by Ideal Model Airplane Earlier, this columnist published his con­ Co. One neat thing about electric is that versations about this item with George FREE IN THE USA the motor can be fully cowled, leading to Armstead, contest manager. He is now able Outside USA send $2.00 very clean lines. to confirm the requested dates July 2 thru In that same line, Dave Hicks, of Wash- July 5. Great stuff! Call for FIRST CLASS mail ingtonville. New York, sends in Photo No. Inasmuch as flying gets started on M on­ 13 show ing an Astro 05 C obalt electric day, this is an excellent opportunity to hold powered Plecan Simplex. Dave reports the the MECA “ Grando" Collectogether at the only change to the original was to lighten Quality Hotel at Chicopee. Although this the construction of the rudder and ele­ writer is greatly pleased to hear the fore­ vator. He says the model climbs like it must going, the earliest we will have this in print have done in the old days with a Brown Jr. will be April. By then, all items should be for power. covered in the SAM house organ, SAM This free flight model glides well and Speaks. I hope to see you all at Westover! gets at least two flights on one charge using * * * ten 270 mAH batteries. Just in from Tony Italiano, NFFS Presi­ WE’LL STAND CORRECTED! dent, is an announcement that the 1990 In a recent photo showing Warren A M A O utdoor F/F Championships have Fletcher’s 1949 Wakefield, the comments been combined with the U.S. O utdoor F/F by this writer on its general appearance Championships on October 16 thru 20 at have led Charlie Stumpf to write a rebuttal. Mid-America Air Center, Lawrenceville, Charlie says, "I’d like to set the record Illinois. O.T. R/C Events will be run by straight. Warren Fletcher, who is now de­ SAM 57. · ceased, flew at the Wakefield Eliminations in New Jersey, that I attended. The model won the right to represent the U.S.A. on O n A ir Continued from page 38 the Wakefield team for the finals staged in England. not mentioned in the text (which is where I "The design, which you disparage, won feel there should be a warning). Then you

84 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER As an R/C Modeler, you put your heart and soul into your creations. We know this because we are also R/C modelers. Until now, having authentically trimmed models required alot of time and money. That is no longer the case with CUSTOM R/C GRAPHICS. We have the capability to produce any replica markings at any scale. Custom Graphics are also available: you can choose rrom our existing line of graphics or you can submit a design of your own on our design form, and our art department will convert your design into finished single or multi-colored graphics. Custom R/C Graphics are made from the finest 2 mil thin vinyl, providing superior adhesion, durability and fuel resistance. Your model will look great from the day it leaves your shop until the day you retire it. The next model you build, DON'T COMPROMISE its looks, just like you wouldn’t compromise its construction. Because as we all know, R/C modeling is more than just a hobby. FREE 1/2” HT. NAME OR AMA # WITH EVERY ORDER OVER $20 Custom Lettering — Authentic scale Trim tapes-very flexible, Trim sheets-easy to Prespaced & Prealigned markings and logos easy to apply cut and apply • 16 typefaces to choose from • All sizes and scales available • 2 mil thin • Our trim sheets are sold at 12" • solid or outlined letters for reproduction from your • 1/16 and 1/8 on 1 roll height by any length desired • 2 color letters supplied art • 1/4 on 1 roll per V • arced, straight or vertical • 64 colors • 1/2 on 1 roll • 64 colors • front or backward slants • Custom graphics made from • 64 colors • reverse type your artwork using supplied • 1/2" to 24” heights design sheets • 64 colors • Predesigned-graphics packages ALL STRIPING AND GRAPHICS AVAILABLE IN STENCIL FORM FOR PAINTED GRAPHICS (INCLUDES LETTERING)

Send for free catalog; color vmmk msnsn me. No minimum charge — selector and design sheets. 4138 Boston Road · Bronx, New York 10475 · (212)652-7248 price better than right must adjust the control surface horns in as "ARF” (almost ready to fly) model, it will FIBERGLASS PARTS far as is needed to get the proper surface attract a wide range of modelers with skills We Carry over 300 cowls and 70 throws. from beginner to expert. The box leads Without the servo arm warning, I believe one to believe that “ Since the main parts of wheel pants made of epoxy glass it is easy to make the mistake I made, as the airframe are already assembled, you light weight - not brittle zero pinholes. follows. Because the adjustable control can have it ready to fly in just a few hours.” Send S.A.S.E. and $1.00 for latest surface horns were longer than I'm used to I am a model builder of 14 years experi­ catalog. seeing on a small glider, I used the third ence. Taking care to do a good job, it took hole out on the servo arms to achieve the me about nine hours over a two-day proper throws. This caused the servo cle­ period to complete the model to a point of vises to rub against the fuselage wing cover airworthiness. This includes picture taking or hatch. This in turn prevented the hatch time and interruptions from small family from closing. My solution was to remove members. Now that I am familiar with the the offending hatch material. It worked, ONAIR, I think I could cut this figure al­ but I now have two small holes in this most in half if I were to build another. nicely shaped hatch. Spare hatches are Considering how long it would take to available (as are most other parts), so I may build a similar model from scratch, I would end up replacing mine. say this model is about 90% ready to fly, To achieve proper CG location, a mini certainly worthy of the word "almost” in receiver must be used because the ON- the acronym ARF. Al R’s receiver is supposed to mount under However, no place on the box or in the T& D FIBERGLASS SPECIALTIES instructions could I find the answer to the the wing fairing hatch near the CG point 38624 Mt. Kisco, Sterling Hgts., Ml 48310 where there is very little room to spare. If it question, who was the model designed Call Us (313) 978-2512 were to go under the canopy, there would for, or what is its intended purpose. be plenty of room, but the model would This question is a good one, because the •New Owners * Steve & Kim Durecki require tail weight to counter balance. As ON Al R1700E is a high performance, sleek, it is, the ONAIR is slightly nose heavy, so fast electric glider. It can build up speed why make it worse with a big 500 mAH rapidly if the nose is dropped, and at these Ni-Cd in the nose? higher speeds control sensitivity increases. For ease of assembly, I would give the At low speeds in turns it can tip stall. These ginners will be getting in over their heads ONAIR a 4.0. things are not what a beginner needs. with the hot performance of the ONAIR Third detail: quality of the instructions. The expected fragile nature of the fuse­ 1700E. Because of this, I would have to rate A fair amount of time was consumed puz­ lage is not desirable for training. Beginners the ONAIR a 4.0 in its suitability for an zling over the wording of the instructions. often pound the ground when learning to obscure intended purpose. Trying hard not to make mistakes, I took fly and land. The ONAIR may not take a lot AREA IV: Innovation, judgement 5 points. care to read every word. Although the of abuse from a true beginner. The ONAIR 1700E is a very innovative written instructions are adequate for the On the other hand, the ONAIR 1700E is model. New structural techniques appear job and very well illustrated, sometimes highly maneuverable and even aerobatic! to have been developed which give the things were not perfectly clear to me. Combined with its speed and carry ONAIR a very nice, high-tech, molded Many times I had to read and reread a through, these things make it very attrac­ quality. The model is almost entirely plastic construction step. I would give the in­ tive to the experienced modeler. with plywood reinforcements and a few structions a 3.5. I would have to say that Yoshioka has metal hardware pieces. The average score for quality of the ON- successfully designed an electric for the The ONAIR 1700E isa molded,expanded AIR 1700E kit is 4.16. intermediate to advanced modeler who bead polystyrene model with something AREA III: Suitability of the model for its wants a high performance, small, quiet very unique added: a hard-shell plastic intended purpose, 4.0 judgement. motorglider that can be flown almost any­ skin. The external appearance of this new The Yoshioka ONAIR 1700E isan electric where, and can be built in a day or two. skin material is smooth, hard, semi-gloss powered motorglider. Because it is an All things considered, I think a few be- white, and very lightweight. The quality of

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 85 all you need for relaxed weekend flying as H o b b y it delivers more than adequate climb per­ hobby specialties r formance and duration. However, if you wish to compete in E-POWER SYSTEMS & ACCESSORIES RAHIM'S limited motor run contests that require ASTRO FLIG HT SYSTEMS; long duration flights, then you will need all Cobalt (4 call) 020 Direct . .$74.96 Geared .. .$97.96 the horsepower you can get. The best Cobalt (5 cell) 035Direct . .$66.96 Geared . .$108.96 W INCHES & LINE Cobalt (7 cell) 05Direct . .$112.96 Geared . .$134.96 choices I’ve seen so far are rare earth mag­ Cobalt (7 cell) FAI 05Dir . .$127.96 Geared . .$149.96 net motors such as Astro Flight’s Chal­ Cobalt (12 cell) 15Direct .$149.96 Geared . .$172.96 lenger 05 seven-turn or six-turn (FAI) 8.4V RETRIEVERS Cobalt (14 cell) 25Direct .$179.96 Geared .. $202.96 motors, Hobby Lobby’s Ultra Series 800 Cobalt (18 cell) 400irect .$209.96 Geared . .$224.96 Cobalt (24 cell) 60Oirect (Sport,Pattern or FAI) $299.96 (8.4V) motor, or Robbe Model Sports Astro DC/DC Constant Amp (up to 28 cells) . . . $97.96 Keller (8.4V) cobalts. I opted for the Astro Astro AC/DC Charger (current a djust)...... $59.96 Flight FAI 05 motor. Astro DC PEAK Charger (up to 12 c e lls )...... $74.96 You will not be able to use the stock Astro A/C D/C PEAK Charger (7 cells A/C) . . . $104,96 Yoshioka prop and spinner with this motor FOLDING PROPR i ORS SwiJcTronl^ as the shaft diameter is too large. Also, the Midway Model Folder 11 x 7 or 12 x 7 $13.45 12x7...... $10.95 13x7...... $14.35 prop adaptor of the Astro motor is too SANYO -R- series BATTERY PACKS long to allow a simple drop-in installation 4 M il 450mA . . S19.50; 5 cell 450mA .. .$23.00 that looks right. It can be done this way, 6 cell 800mA . . S30.20; 7 cell 800mA .. .$34.15 but you end up with an almost 3/8-inch 6 cell 900mA ..$31.29; 7 cell 900mA .. .$35.54 6 ce!M200mA ..$31.29; 7 cell 1200mA .. .$35.54 gap between the “ firewall” and the rear of “All packs wired flat. “ “Please specify connectors. the spinner. What you need is a 5/16-inch Individual Sanyo "R” series cells. (or thinner) shim to go between the motor 450 A R ...... $3.50ea 800 AR .. $4.05 ea 900 S C R ...... $4.i5ea 1200 SCR . $4.15 ea and the firewall to close this gap. BOOKS on Electric flight: I made this shim out of a combination of Quiet Revolution (Bob Boucher)...... $7.00 Lite-Ply and aircraft grade plywood pieces Building & Flying Electric A/C (Mitch Poling) .. $8.96 from my bin of scraps. Two 1/8 inchers and Hobby Horn Electric Info Book (Bob Sliff)...... $2.50 one 1.5mm ply scrap tbgether were the SHIPPING & HANDLING a? Page 1990 CATAI Ofit IP perfect thickness. Remove the stock fire­ Up to $8.00 add $2.00; W IN C H 5300 $6.01 to $20.00 add $2 pp/1st Class, or free when wall spacer, tack glue the scraps to it, then $2.50; $20.01 to $45.00 requested on 1st order. add $3.25; $45.01 to cut the scraps to the same size. POWERFUL 12 VO LT $70.00 add $3.75; Over Hobby Horn The Astro prop adaptor is much wider $70.00 add $4.50 15173 MORAN ST. [B1 Calif, add 6.25% tax. P.O. BOX 2212 than the stock Yoshioka part, so what you’ll Send MO. VISA/MC (# & F3B QUALITY ίιχρ) or Check (allow up WESTMINSTER,CA 92684 need to do is open up the large hole in the to 30 days for clearance (714) 893-8311 on checxs.) Hours: Mon-Fri 9AM - 5PM firewall and ply shim pieces so that it will fit LAUNCH A PLANE inside the plastic ONAIR nose cone with EVERY 60 SECONDS only the prop adaptor’s flange and prop the moldings is exceptional. Accuracy is shaft sticking out. Don’t let anything rub or excellent, the aesthetics of the design are you may end up frying your speed control appealing, and the flying performance is when the motor turns on! I used a rat-tail first rate. file and a Dremel Moto-Tool with sanding The ONAIR only weighs 41 ounces ac­ drum for this operation and it worked cording to my cheap but fairly accurate great. spring scale. This is very light for any elec­ Next, because the prop adaptor runs tric short of a com petition model. This is a partially inside the fuselage, you will need direct result of this new lightweight struc­ to drill a hole in the nose cone just behind tural technique,and it is partly responsible the firewall, and file a groove in the stock for its excellent climb rate. firewall spacer to correspond to this hole, The great looks and performance that so that a hex key will reach inside to the set Yoshioka has achieved with the ONAIR screw on the adaptor. are possible with this new and most inno­ Astro prop adaptors rarely fit the holes vative molding technique. It needs some in the props that are best suited for this further development to improve its ding motor, however this malady is simple resistance and give higher strength, but enough to cure. Wrap a 1/4-inch wide Yoshioka is definitely on to something with strip of masking tape around the prop shaft a lot of possibilities! until it is too thick for the prop to fit over. For innovation, I will have to give the Then, one wrap at a time, cut off and re­ RETRIEVER $250 ONAIR 1700E a perfect 5.0. move the tape until a snug fit is achieved That is how I judged the Yoshioka ON­ inside the prop. I have used Yoshioka 8X5.5 6 -VOLT AIR 1700E. When you add up all the points and Robbe 8X6 props with excellent flight from the four main areas, you reach a 17.1 results. RETRIEVE WINCH total. This score out of a possible 20 is ex­ The climb on Astro's 05 FAI motor is cellent. I believe it accurately reflects my nothing short of fantastic. It gets to thermal LINE IN 20 SECONDS satisfaction with the model as a whole. For altitude in about 30 seconds, where the the electric flier with experience, I stock Yoshioka motor would take twice recommend the ONAIR 1700E. this time. There is a penalty to pay for this * * » kind of horsepower (called watts), and that RAHM'S UPGRADING THE is increased current draw. The 900mAH, ONAIR’S PERFORMANCE seven-cell Ni-Cds I used were out of juice 9309 E. M aple St. The ONAIR 1700E comes with an excel­ in two minutes with the Yoshioka 8X5.5— Bellflower, CA 90706 lent Mabuchi-type 540 can m otor which less than two minutes with the Robbe 8X6 has a ball bearing to support the front of (as is expected). The Robbe gave the better Phone (213) 866-2405 the armature and a stator ring to concen­ climb, but at the cost of shorter motor trate the magnetic field and give stronger, runs. longer m otor runs. Normally, this motor is Heat is a problem if you plan on running

86 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER the up-to-40 amps this kind of motor draws. By all means run a heat sink on your MOSFETspeed control or you may end up Sheldon's damaging it. Those MOSFET types with Temp-FET designs also benefit from heat SPECIALTIES sinks even if they can shut themselves Posi-Cure down before damage occurs, because as the temperature rises to extremes, re­ We can hook you up! 2 oz. Cyanoacrylate sistance goes up inside the MOSFETs. GAP FILLING FAST CURE That's bad. Heat sinks bleed off heat. That’s 10-25 SEC. 3-5 SEC. good. -S A L E — , I— SALE — Ί In all fairness, the Panda PSC-1 worked $ 4 4 9 $ 4 4 9 fine without a heat sink, but I plan to get SHS700 one ASAP before I run it again. It does get SHS702 very warm! OUTSIDE CALIF. The ONAIR1700E should be competitive ORDERS (800) 228-3237 against the better hand-builts in LER thermal duration contests. I plan to fly it at ONLY (800) 822-1688 the next Astro Champs to see if I'm right. INSIDE CALIF. See ya there! · For Information Call: (408) 943-0872 HOURS: Pacific Standard lime Monday & Friday 9:30 am - 7:30 pm Jet Trails Continued from page 41 Tuesday. Wednesday & Saturday 9:30 am - 5:30 pm Thursday: 9:30 om - 9:00 pm One of the real crowd pleasers, in my Sunday: 12 noon - 5:00 pm opinion, was the scale R/Cjets. Bob Violett If you are nol satisfied with POSI-CURE put on a great demonstration with his please return the unused portion within camouflaged F-86 Sabre. This airplane 30 days for a full refund - No questions looks very realistic in the air. Bob demon­ asked! strated his scale-like operating doors. He also did high speed passes and slow speed Metier Cotd flights and he jettisoned his auxiliary fuel Free Catalog tank. The spectators loved it. Not to be outdone. Bob Fiorenze demon­ of our linkage accessaries. strated Yellow Aircraft’s new single engine Prices increase 2-1-90 F-4 Phantom. This is a beautiful and highly 103 Wholesale Avenue N.E. detailed model done up in a Navy combat Huntsville, Alabama 35811 color scheme. The airplane is very fast, yet appears to be flying in the scale speed envelope. The Yellow Aircraft F-4 is rock we will see them as competitors. solid in the air and does not use a gyro on Now let's talk about the Top-Gun event. its rudder to keep it tracking straight. When For those of you who are not familiar with it comes to “ hot dogging" a jet. Bob is the this event or have never seen it, I will try to best. His high speed, low inverted passes explain it to you. First of all, the Tangerine appear to be a piece of cake for him. It sure Top-Gun event should not be confused excited the spectators. The low speed char­ with Frank Tiano's Top-Gun Invitational. SHIPPING & HANDLING: Basic $4.95 For U.R$. Surface acteristics of the F-4 Phantom are also ex­ These two fly-ins are totally unrelated. The • UPS. Air ond Porcel Post $4.95 plus 10% of Merchandise Total (Continental U.S.) cellent. It is really a good flying airplane. Tangerine Top-Gun was designed to offer • Parcel Post Air $4.95 plus 15% of Merchandise Total Another interesting airplane at this air a challenge to the top fliers and innovators (Continental U.S.) • UP.S. Next Day Air $14.00 plus $1.00/10. of shipment show was Art Arro’s A-4 Skyhawk which is in the jet model fraternity, to promote the •C.O.D. add $3.00 • Foreign Orders Parcel Post Air $4 95 ♦ 20% of an original Bob Violett A-4 Skyhawk kit. advancement of jet models and their Merchandise Total Art told me that this model is eleven years power systems, and most of all to have fun old and still flies great. and fellowship with other jet modelers. Paul Lupia kept the spectators guessing (For those of you who would like a com­ for two days as to whether he was going to plete set of rules for Top-Gun, contact If You Have Been fly his very pretty Byron F-15. Paul had Contest Director Dave Tyson, at 1179 Looking For The Lowest registered as a competitor but chose not to Howell Creek Drive, Winter Springs, Prices In R/C Equipment, compete due to the fact that his airplane Florida 32708, or call him at (407)695-2836.) had not yet been flown. After the contest Now I will give you a brief description of Your Search Is Over. was over, Bob Fiorenze test flew the big jet the Top-Gun maneuvers: shortest takeoff, for a successful first flight. Upon landing, slowest flight and fastest flight (both of OVER the spectators applauded both Bob Fior­ which are flown through a speed trap), 10,000 enze, the test pilot, and Paul Lupia, the most vertical rolls, two pattern maneuvers ITEMS owner and builder of the model. (pilot’s choice) from the A M A pattern list, Dave Nicholson had two jet models at two freestyle maneuvers, spot landing, and FREE this meet. His modified Byron MiG, using a lowest noise level. Bob Violett "V iojett” fan system, flew great The turnout for Top-Gun was rather dis­ Write and a lot faster with the Viojett modifica­ appointing, to say the least, with only four For Your New tion, as did Dave’s modified Midwest Hein- entries. However, the four participants did Sheldon's Hobbles Color C atalog kel using the same fan and engine. a dynamite job of flying in this competitive Missing at this year’s Top-Gun event event. I congratulate Terry Nitsch, Dave were Ron Gilman (the first winner of the Ribbe, Greg Garneau, and Dave Escobar, Top-Gun award), Ron Shafer, Eric Baugher, the four pilots who participated. In the SHELDON’S HOBBIES Louis Levine, Don Muddiman, Tom Velo- Top-Gun fly-off, there is only one win­ 2135 OLD OAKLAND RD. sky, and Norm Holland. I saw Norm, Tom, ner—no points for second place. The event SAN JOSE, CALIFORNIA 95131 and Don as spectators. Maybe next year was won by Terry Nitsch. He did a superb

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 87 GREG NAMEY’S AWARD W INNING FW 1 9 0 D - 9 EASY TO BUILD . . . EASY TO FLY Polyester Hand Laid Fiberglass Fuselage Complete Balsa and Hardware Packages Included Machine Cut Foam Wing Cores Heavy Duty Styrene Clear Canopy Fiberglass Cowl Span 69-1/4" Weight 12-1/2 to 15 Pounds Engine From 90 to 1.08 Two Strokes Price $229.95 AHA NATIONALS — SCALE MASTERS — KING ORANGE — TANGERINE — VOLUNTEER STATE MEET WHEREVER IT IS ENTERED IT DRINGS HOME THE TROPHIES!

INNOVATIVE MODEL PRODUCTS INC. P.O. BOX 4365 · MARGATE, FL 33063 · (305) 978-9033

pun intended) on this subject. Stay well Electric Flight and keep ’em flying. · On o ff C onlfollet Manufacturer of High Perfect for 05 Motors 5-10 cells F-86 Continued from page 48 Performance Sailplanes of the last steps before finishing the model and Electric Aircraft is the installation of the control linkages, Has Brake which are clearly illustrated on the plans Lightweight 1.2 oz. Adjustable switching point and manual. All control surfaces are very Solderlevs terminal for easy hookup _ solid with every precaution taken to dis­ ON/OFF Controller $ 24.95 courage flutter. Each aileron and flap has More Power, save weight Very high efficiency only 0.06V loss its own servo for a solid and easy installa­ at 20 Λ. Size 2J x 1 J il63 tion. The elevator, rudder, main gear and , A d d S I.00 fo r shipping M O D E L S I N C v ' v N T / J f / ' California residents add 6.5% $ 1.63 Tax throttle use one servo each. ‘ \ / Send Check or money order to The tailpipe is rubber mounted to ab­ cofw«iihsi ' J jt H ig h S k y 2526 Washi'ctoR, Dubuque,IA 52001 319/5S3-4S30 Fataba coaecdor ^ > 3 9 2 9 K a n s a s S t . # 9 sorb noise and vibration. Even the tuned /to SS”' San Diego,CA 92104 pipe muffler is rubber mounted. All gear doors and the retract installation are clearly job of flying his modined Viper. Dave Bob Violett ran into some bad luck. After illustrated. After final sanding, the aircraft Ribbe, a young engineering student from the contest was over the pilots were al­ is prepared for finishing. All wood surfaces Orlando, was breathing down Terry’s neck lowed to fly their airplanes. Bob was are covered with pre-primed Micafilm with only a few points separating the two. demonstrating his camouflaged F-86 Sabre. epoxied to the balsa instead of the con­ Watch Dave next year, he could be the He was really pushing and hot dogging his ventional heat application. This process next Top-Gun. F-86 with high speed low passes, four-point was used to eliminate bubbles and sagging Jerry Caudle took home the Fastest Ti me rolls, inverted passes, and climbing rolls. and also to provide a hard skin finish. The trophy with a scorching 2125 mph flying He sure looked like he was having fun. epoxy is brushed onto the wing, Micafilm his Viper. I think he uses an afterburner on Then it happened. On another high speed is applied, then a squeegee is used to re­ his jet model (only kidding, Jerry, you won low pass Bob hit one of the speed trap move excess epoxy under the Micafilm. it fair and square). Right behind Jerry was poles and his F-86 bought the farm. Even This whole application resulted in a weight Mr. Top-Gun, Terry Nitsch, with a speed of the pros are not immune from this type of gain of only 3.6 ounces. 2124 mph, flying his modified Viper. accident. The retract system, which is engineered Dave Latsha won Best Finish with his In summing up, I would like to say that and manufactured by Bob Violett Models, beautiful yellow and black Sportshark. this Fan Fly was well organized and a lot of is the only system developed and sold spe­ Terry Nitsch won the Most Outstanding fun. It was also a great spectator attraction. cifically for the F-86. The gear and doors award for his performance with his m odi­ However, I think we missed the true mean­ are sequential and operated by only two fied Viper. Awards for Best Scale and Most ing of "Top-Gun.” In the movie of the servos. The system looks complicated, but Realistic Flight were won by Bob Violett same name. Commander M ike Metcalf, through the use of highly detailed draw­ with his F-86 Sabre. code name Viper, states, and I quote: ings and photos, it can be accomplished by As I said earlier, there were a few "Top-Gun was created for A.C.M. Air most any modeler. crashes—there usually are when you push Combat Maneuvers (Dog Fighting).” He The aircraft was primed with K&B primer airplanes to their maximum performance also stated that the Top-Gun school was and sprayed with K&B Superpoxy. and then some. Dick Guerra crashed his for combat training. I think that the Top- To date, my F-86 has in excess of forty great looking Viper. I did not see it happen, Gun should be limited to scale military flights, all off o f a grass field. This sounds so I can't give you any details. combat jet models. I’m sure there would too good to be true but this kit is a dream. Dave Escobar wiped out his beautiful then be more than four participants in the The KBV 82 and pipe installation works Viper done up in the Blue Angels color Top-Gun event. Have a special event for flawlessly and is by far the quietest ducted scheme. Dave was doing a high speed in­ the “ hot rod” jets and in this way you can fan flying to date. The landing gear, with all verted pass when he dove in. His plane was have the best of both worlds. of its operating doors, is maintenance free, completely totalled. I’m sure that I will get a lot of flak (no even for grass field operation. (In the

88 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU) MODEL BUILDER northeast, hard surface runways are only for full-size aircraft. Ducted fan pilots in this part of the country have to settle for aircraft that can fly off of a grass field. This eliminates 80% of the fan kits on the market today.) The F-86 is very stable from a speed range of 30 to 150 mph. When flaps and gear are extended, there is no pitch change. Slow flight has to be seen to be believed. The Sabre turns tight and is con­ trollable right down to touchdown speed. This is a giant step in true scale jet per­ formance, and all credit is owed to Bob Violett. He is the one who started flying and designing fan jets, and now, many years later, he is the first to perfect ducted fan aircraft. After building and flying ducted fan air­ craft for the past ten years several ob­ servations have come to light concerning the F-86. First off, the model has more power than you will ever need. It is capable of accelerating in a vertical climb. You should decrease the power during dives because the model could exceed 200 mph. This is a speed which is probably beyond the servos’ ability to cope with air loads. The F-86 is surprisingly “ user friendly.” It performs and handles with the ease of a current) input current is being rectified. good pattern ship. After a few minutes of This is fine for NiCd battery charging; as a LAST... matter of fact, NiCds seem to prefer this familiarization, everyone who flies it looks A Free Flight Model like an experienced jet jockey. type of charging current to purer DC. The Retrieval System that From the instructions to the injected reason is probably that the pulsating cur­ w o rks . . . EVERY TIM E molded parts, Bob Violett Model kits rent reduces the growth of inner "whisk­ exemplify the total engineering concept. ers” that ultimately cause shorts between An ultra light weight, long range miniature transmitter combined with a This includes their jet kits, Viojett fan, KBV the elements of the cells. Of course, NiCds highly sensitive receiver and directional 82, fuel cells, retracts, and even the starter also charge well from pure DC, as evi­ antenna will quickly help you track and denced by the thousands of battery pow­ probe. All of this makes the F-86 the perfect locate your plane. kit in today's market. ered chargers in daily use. Pulse charging When I purchased my BVM product I will reduce heat buildup in the battery, NEVER LOSE ANOTHER MODEL! also received free of charge the combined and its effects are probably a small and Send SASE For Brochure expertise of the entire Violett staff. They maybe even insignificant increase in cell are all highly supportive of each customer’s cycle life. Jim Walston efforts. One of the poor qualities of this type of Retrieval Systems 725 Cooper Lake Rd. S.E. As a final note, I would like to extend my circuit, its lack of voltage regulation, is Smyrna, GA 30080 congratulations to Bob Violett and his F-86 actually desirable for battery charging ap­ 404/434-4905 for placing first at the 1989 Scale plications. The increasing resistance of the Masters. · battery as it accepts a charge acts to auto­ matically decrease the charge rate. the design, when tested w ithout a load, as Anyway, these simple circuits work well, Larry indicates, it will exhibit a much higher Electronics Continued from page 51 and are widely used for battery charging voltage; 19V in this case. Also, when first purposes. The power supply and/or bat­ connected to a completely discharged charge the intended battery, and a rectifier tery eliminator are also transformer/recti- battery, the current will read higher than diode. See Sketch A. An LED (light emitting fier circuits, but will usually use full-wave 500 mA. Conversely, when the battery has diode) is generally added to the basic cir­ rectification, which generates a purer DC reached its full charge state, the current cuit (see Sketch B) as a charge indicator. In waveform initially, further improved by will be lower than 500. Somewhere in the this case, the resistor seen in parallel with filtering. For use with equipment which range, and probably for the highest per­ the LED is there to carry some of the charge requires an even steadier form of power, centage of the recommended charge time, current, LEDs being limited to 20 milliam- some of these units will sometimes include the current was at 500 mA. All of this is due peres or so. An expanded version is seen in voltage regulation. Usually, audio or test to that changing battery resistance men­ Sketch C; a dual charger such as is furn­ equipment will be provided with this type tioned earlier. Now, we can’t measure the ished for transmitter and receiver use. In of power source. true charger voltage with the battery this case, the transformer chosen must So far, we have been discussing and connected, as the battery confuses the furnish a voltage high enough to charge dealing with fact. Now the confusing part, apparent value, but if we were to substitute the eight-cell transmitter battery, the volt­ we start dealing with the markings to be a resistor of the same value for the battery age being reduced to that required by the found on these devices, which you will at certain points of its charge cycle, we four-cell airborne unit by the series resis­ soon learn to accept as proof positive that would find that the charger voltage is tor. Minor variations will be found from you should not believe everything you dropping at the same rate as does the make to make, such as the use of dual read—unless, of course, you are reading it current. LEDs, or dual winding transformers, but here in EC. The same thing applies to and is happen­ basically these chargers are all the same. In the case of Larry’s 12V 500 mA charger, ing with a system charger, generally The output of this type of circuit, a half­ assuming total honesty on the part of the marked “ 9.6V @ 50 mA and 4.8V @ 50 wave rectifier, is a 120 Hertz per second supplier, it is intended to charge a 12V mA.” In both instances, the unloaded volt­ pulsating DC (direct current); only the battery at an average of 500 milliamps. Note age will read higher, as will the initial positive side of the 60 Hertz AC (alternating that average—it is important. Because of charging current which will decrease in

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 89 formulas. But there is an even simpler test: if it starts to get hotter than it does in its normal application, you are working it too hard and will eventually cook it. There are a lot of bargains in these wall transformer chargers from the electronic surplus stores and catalogs, and usually for a couple of bucks and a handful of resistors, one can come up with the proper combination to charge most any battery on hand. * * * Servos are almost as popular a subject here in EC as batteries. Therefore I know a lot of you will be interested to learn of a new one of the type often referred to as "Quarter Scale." It is the J.C. Development MS-747WB servo; large, heavy duty, high power. Specs for it are as follows: Super Glue Size: 2125" x 2375" x 1.0625" Weight: 3.9 ounces Speed: 0.26 seconds/60° Ideal For Field Repairs Torque: 167 ounce/inches Required voltage: 5VDC Instant bonding c/a in a no-spill, easy Current requirements: to use push button applicator. Idle: 25 mAH Perfect for quick field repairs. No Load: 300 mAH Maximum: 1400 mAH Just push the button for one Signal input: Positive pulse k drop or hold for a continuous 1.5 mS Neutral bead. It s also reloadable, just M in 0.8 * drop in Super Glue Refill Max 22 Rotation: 90° or 180° O Cartridge. Cat. No. 796 Connectors available: Futaba "J" The MS-747 is definitely of the type re­ DU-BRO PRODUCTS INC. quired for Quarter Scale and other high power requirements. Its power is trans­ 480 BONNER RD., WAUCONDA, IL 60084 mitted through a 9/16-inch output shaft to either a 1-5/8 inch wheel or 2-1/4 inch four-sided arm. Everything is sufficiently rugged as required for its intended ap­ plication—heavy case and gears, ball bear­ ings, large 25mm motor, 1C amp with ex­ ternal drive transistors in a bridge con­ figuration, and O-ring sealed case and out­ put shaft. Though it is furnished only with a Futaba connector, installing any other can A Nationals Winner be done quite simply and safely w ithout The “Heinkel” He 100-d the need for splicing, as the amplifier is 24' Wingtpan — Rubber Powered Flying Scale uncrowded and easy to work on. $ 1 5 . 9 5 Kit f t 10 The MS-747 is economically priced at Your oW building shills will enjoy the experience. Time loo to get your son learning how A beautiful hit In the Flylino $32.95, directly from J.C. Developm ent, tradition, contest winning flight ability Decals, Canopy and Spinner are included. Quality balsa, a hit we are proud ol 2716 Bayberry Way, Fullerton, CA 92633; Wo ve oot a whole line ol old favorites. Please send 50« for out Flyline Catalog. (714)879-3266. It is also available from Phone: (703) 273-9693 Dealers and Distributors are Invitod. Condor R/C Specialties, I733G Monrovia FLYLINE MODELS, INC. Ave., Costa Mesa, CA 92627; (714)642-8020. ______P.O. Box 2134. Falrfo», Vlrglnlo «031______For comparison purposes, the Futaba FP-134, for which this is obviously intended time. taining them is easy. We need to start off as a replacement, is rated at 112 in./oz. and Now, this same charger can be used to with at least a 50% charged battery, to ob­ priced at $64.95. charge any other batteries of less than the tain an average charge rate. Refer to Sketch WAS 1ST DAS? charger’s own voltage. The rate at which D; simply connect the charger to the bat­ I've mentioned before how frustrating it they will charge is determined by the dif­ tery, and read the current. Then add resis­ is to me to see something that appears ference of the two voltages; i.e., the tance to lower the current to the desired interesting in one of the foreign magazines charger voltage at the desired rate, and the value, probably 120 mA for overnight that come my way and not be able to "Read battery voltage. We could, for example, charging for the sub-Cs. Again, the current All About it.” I manage to fum ble Qiy way charge a four-cell pack, though the current will be higher initially, tapering off towards through some of them, even resorting to would probably be at two to three am­ the end of the charging period. Although the appropriate dictionary at times, but peres. We can control and adjust this in this case we are measuring and adjusting except for the electronic schematics, the charge rate with a series resistor as shown the rate of charge, we are also effectively Japanese Radio Control Technique defeats in our basic charger diagram. controlling the applied voltage to the bat­ me almost completely. Almost, but not The ten sub-Cs that Larry mentions? Yes, tery. O hm ’s Law is always working! quite, because the old saying about a pic­ they can be charged with this charger, but This same procedure can be used with ture being worth a thousand words still the voltage to be applied is determined by almost any charger and battery combina­ holds true, apparently more so if the words the charge rate desired. Obviously, with all tion, even down to one cell. The one cau­ are in Japanese. Therefore, I can introduce of the variables involved, it is impossible tion is to not overload the charger, for you to something quite interesting, if for me to state any exact values, but ob­ which we can also test with more of those slightly out of the electronic context, from

90 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI MODEL BUILDER the pages of the August 1989 R/C Tech­ n iq u e: the E-170 "UFO” . . . see the INDOOR FREE FLIGHT EXTRAVAGANZA drawing. 1990 I’m not sure what one could call such a ^ ■ June 4 - 6 F1D WORLD CHAMPIONSHIPS flying device, though it is obviously more June 7 - 9 AMA Nationals (Combined with) helicopter than airplane. I guess the maker isn’t too sure either, hence the "UFO ” tag. UNITED STATES INDOOR CHAMPIONSHIPS Anyway, there it is, radio controlled, elec­ AMA-NFFS tric powered, gyro stabilized, and available only in Japan at this point. Control is achieved by varying the speed of the EAST TENNESSEE STATE UNIVERSITY MINI - DOME motors, all done automatically through a companion transmitter which, I am proud JOHNSON CITY, TENNESSEE to announce, is a four-channel system 25 GREAT EVENTS IN A 116 FOOT DOME! configured to the mode of champions, Mode One! According to the other sketches included in the article, the (?) is For Details Send NO.10 SASE to: capable of flying up or down, forward and USIC, 1655 Revere Dr. B ro o kfie ld, W isconsin 53005 backwards, left and right, and rotating around its central axis. It does not appear to be able to bank at all, though it would seem that it should with appropriate motor speeds. However, it has two gyros, working in different axis, and it is probably one of them that keeps it in a level position at all IT’S BIG. times and probably what makes it possible The C Series family of 5, 7 for it to fly at all. and 9 cylinder fine scale Rather small, the UFO measures only radial engines from Techno­ 8.66 inches across its circular frame, not power II are BIG. in fact including the propeller arc. The props, 9" in diameter BIG. They're which are shaped more like helicopter also BIG on power, preci­ rotors than propellers, are 5.3 inches in sion and scale realism. diameter, and are driven by .5-inch motors with 1:5.4 reduction. Weight of the UFO is Easy to start, powerful and 4.2 ounces. Probably due to its weight reliable, a Technopower II carrying limitations, as with most electrics, C Series radial engine will the batteries in use are only of 120 mAH add that certain ' magic” to capacity at 1.4 ounce, with a resulting flight your airplane that only a time of less than two minutes. I would venture to guess that even indoors under Technopower II radial en­ no-wind conditions, two minutes at a time gine can. is enough of this kind of flying for most of To find out more about us. these and other exciting Sorry, but to the best of my knowledge, fine scale radial engines, the UFO is not available in the U.S. at this contact Technopower II. time, though if in fact it is a successful flier TECHNOPOW ER II INC. we’ll see it soon after the next major trade 610 North Strew. Chagrin Falls. OH iifl> 2 · (216) 564-9787 Complete Brochure S.$ 00 · Visa A MC Accepted show in Japan, as I know a large number of our major importers attend every year. Hey, come to think of it, apparently my Federation ROG, and Coconut Scale. entertainment? There isn’t even an entry Japanese isn’t all that bad after all, huh? Something for almost everyone! More de­ fee! Maybe some of what a long-haired dic­ tails may be obtained by sending a large, tionary taught me a long time ago is still pre-addressed, stamped return envelope FLYPAPER with me. And to clarify that point, I must to: A.J. Italiano, 1655 Revere Drive, Brook­ Perhaps there are cheaper flying models say that in those years, only girls had long field, Wisconsin 53005. than Pistachios, after all. We refer to paper hair and wore ponytails! · gliders, which have their own avid sup­ PISTACHIO INTERGNATS porters, and even a regular four-times- Hannan Continued from page 57 If you are unable to attend the Johnson per-year newsletter, entitled, logically City festivities, you can still participate in enough, Flypaper. Edited by Charles E. an international indoor event, simply by Peck, the 16-page publication is concerned ner, signed on the inside by the entire entering the M IA M A W orld Proxy Pista­ with history, contest classifications, con­ Ryan crew who constructed the aircraft, chio Intergnats. Rules are quite simple: struction, book reviews, and plans. The cracked before the transatlantic flight, and Any flying scale model spanning eight current issue features a “ Paper Cub” and was given to the late Hawley Bowlus, fore­ inches or less, or having an overall length an origami flying wing in plan form, both man of the Ryan team, by Charles Lind­ of six inches or less is eligible. Or, if non­ to be constructed from paper and in­ bergh himself. scale is more in your line, you can build an tended to fly. Subscriptions are available eight-inch span version of any outdoor for $10fro m : Flypaper, Box 47186, Wichita, FORTHCOMING EVENTS cabin model, and enter the model-of-a- Kansas 67201. June 4th through the 9th are the dates, model event. Proxy-flying instructions, and Johnson City, Tennessee is the place documentation, return postage and, of WORDS OF WISDOM for the largest indoor model extravaganza course, your model, must be sent to Florida Paul M c llra th ’s granddaughter, Shay, of 1990. Included will be the F1D World by April 20. Additional details may be ob­ wrote a "How-to-make-a-project” theme Championships for microfilm models, the tained by sending a stamped, pre-ad­ for school (third grade class). She closed AMA Indoor Nationals, and the United dressed return envelope to: Dr. John her article with these astute words: “ If it States Indoor Championships. Bonus Martin, 2180 Tigertail, Miami, Florida 33133. works, don’t let your little brother wreck it, events are the M IA M A Pistachio Gran Prix, Where else can one find such low cost and show it to your mother and dad. If it

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI 91 INDOOR MODEL SUPPLY at the same pitch. In other words, the am­ plitude is being modulated. ENDURANCE RUBBER MODELS a Using the same example, FM signals are THE EASY B • IMS Gliders 12" Span transmitted by distorting the 72.500 MHz frequency very slightly. Thus, if you were g i f t to hear audio tones at 72.500 MHz, the $6.50 sound volume would be constant but the THE SLOWPOKE 16' Span that tonal pitch would vary high and low con­ stantly. In other words, the frequency is

A-J Hornet being modulated. A large percentage of y Weight 2? PennysPen $5.95 flies. modern radio control sets are now FM Plaslic Prop 3 Parlor Planes The Novice Penny Plane because FM is more noise proof. For example, an AM set would get confused easily if you rub metal parts together be­ cause that generates sparks. It’s like the Historic, 72.500 M Hz sound is being polluted by S8.50 10 Span Hand Made, another sound created randomly in the NEW TOP FLYING MODELS Ready-to-Fly, FOR CONTEST & SPORT IN AND OUTDOORS background. On the other hand, an AM 20" DAPHNE EA. $8.50 fovrkoAjuudot' system fails more gracefully. Under poor "FLAPPING FLYER' Balsa Wood, conditions, an AM system may still provide Model Airplanes. some degree of communication effective­ ness when an FM system has failed com ­ pletely. FM systems have a threshold ef­ YES! Please RUSH me: fect; they either work flawlessly, or not at A-J Classic 3-I’acks that include the 74 Fighter, A-J Hornet ft 404 Interceptor Each Pack is 519.95 nlus 53.00 all! Most of us have experienced this shipping & handling. Add 5LMior 2nd-Day UPS threshold effect in listening to an FM radio in a car. As the distance from the transmit­ ter increases, a fraction of a mile will often make the difference between high-quality 13" SCALE AIRCRAFT KITS reception and nothing but noise, while OUTSTANDING DETAILS. 3·VIEWS & HISTORY AM radio stations may have a lot of noise, AERONCA K 1937 ALCO SPORT 1929 WATERMAN RACER 1921 but are still understandable. ZIPPY SPORT A.R.V. HEATH PARASOL 1928 Therefore, PCM and PPM refer only to ea $8.50 INDOOR MODEL AIRPLANES by Lew Gitlow internal coding. AM and FM determines 48 pga. 100 illuat. (reprint) ♦ FREE PLAN... $5.95 signal transmission through the air. Pre­ INDOOR BALSA PACK $8.25 P-NUT PACK $8.25 JAPANESE TISSUE -18" x 22" 7 color roll $6.95 developed for models because the digi­ sently, all the PCM radios on the market CONDENSER PAPER 2/53.25 MICROLITE $3.25 RUBBER LUBE $1.95 BALSA CEMENT $1.95 talized input would have to be generated also employ FM transmission. But the less THRUST BEARINGS Mini Dual or Dual $1.00 by shaft encoders or other analog-to-digi- expensive PPM radios come in both AM or RUBBER 025 to 090. 005 me ea $2.65 6:1 WINDER $5.95 16:1 MARK 1 $i3.95 tal converters (one per channel) and similar FM format. The Vanguard 6H comes in WE STOCK PECK, R/N, & BROWN A 23 CO* devices would be required for decoding. two versions. The PCM/FM version retails ADD 10% POSTAGE-MINIMUM POSTAGE $2 00 Encoding and decoding equipment is so for $499.95 and it is called Vanguard 6H NEW 18-PAGE ILLUST CATALOG $2 00 large and expensive that PPM is impractical PCM for short. The PPM/FM version retails BOX 5311, SALEM, OR 97304 for models." for $399.95, and it is called Vanguard 6H What is referred to by our equipment FM. As both sets incorporate FM transmis­ doesn't work, give it to your little brother, manufacturers, who go so far as to even sion through the air, they should both have and don't even tell your mother and dad label their equipment as PPM, is in actuality the same radio range. But the difference is that PCM is a smarter coding technique about it!” PWM, Pulse Width Modulation, in which and the PCM receiver knows when there PREDICTION the length of the control pulse varies in are noises from other channels or sources, Back during 1982, business w riter Max­ accordance with the movement of the con­ well Newton was quoted in the TWA pub­ trol stick. In true PPM, encoding is done by and would intelligently neglect them. Both Vanguards come with four 94102 servos, lication The Skyliner as predicting that by moving a fixed width pulse within a given 600mAH Ni-Cd battery, 1991 approved 1990 the m ajor co m p e titio n fo r airlines time frame. narrow band receiver, frequency flag, would be the communications industry. In review, the important points are that servo trays, and spare servo arms. Bob Noting the "wretched conditions" of air­ PPM (sic) and PCM are methods used to port access in metropolitan areas and the convert mechanical stick movements into Renaud, at A irtro n ics, says in 1990 the radios will come with a 1000mAH receiver "filth and squalor” of public transporta­ electronic signals; AM and FM are the battery. tion, Newton opined: "Transporting radio frequency transmission methods My Vanguard radios were tested in my human beings for the purposes of com­ modified (modulated) by the encoded flybarless Cobra/Legend helicopter. The munication must progressively give way to signal. Cobra/Legend is a model with a bunch of the efficiency of moving voices and images The above "Editor’s Notes" were fur­ GMP Cobra and Legend parts mated to­ and thoughts.” nished by our "Electronics Corner" editor, gether. As we explained in the World Our thanks to Carl Hatrak for this Eloy Marez. Now back to James Wang. Champs report in the December 1989 is­ thought-provoking item. FM and AM refer to how the radio sig­ sue, rotor blades generate significant SIGN-OFF TIME nals are actually transmitted through the amounts of steady and unsteady loads We close this column with a comment air. Both PCM and PPM signals can be used which are all fed back to the poor servos. submitted by Tom Ersted, of Kettering, to modulate A M or RF signals before they For flybarless model helicopters, the dy­ Ohio: "Good enough isn’t!" · are sent through the air. First, let’s see what A M (amplitude modulation) means. For namic loads are fed directly to the servos exam ple, say I am using a 72.500 M H z because there is no flybar to act as inter­ Vanguard Continued from page 39 (megahertz) transmitter. AM transmitter mediate to dampen the aerodynamic and signals are sent through the air by varying inertial loads. Therefore, flybarless model sistance-capacitance integrator reconsti­ the loudness (volume) of the electrical helicopters should employ only high tutes the original signal. This modulation wave oscillating at 72.500 MHz. If you were torque servos. In the Legend review scheme is called pulse position modulation able to hear an audio tone at 72.500 MHz, (M odel Builder July 1989), I used the A ir­ (PPM). amplitude modulation means the tone tronics Quantum radio with the 94735 con­ " This type of digital control has not been w ould get louder and quieter, but always test heli servos. These servos each provided

92 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER announces Stu Richmond’s GOLDEN BREAK-IN FUEL Now, for the first time. . .

A fuel professionally formulated specifically lor those critical Γι-st hours in the life of your expensive engine STU RICHMOND POWERMASTER has enlisted the help of STU RICHMOND, world-famous engine expert, to give you his Internationally known expert favorite break-in brew, complete with a 32 page booklet detailing his proven break-in procedure. on model engines ...author of "Engines of the World" and By using GOLDEN BREAK-IN FUEL and Stu's time-tested instructions . you can extend the life of your Inside Engines" columns in engines by many, many hours. Engines are expensive . . why not enjoy the life the manufacturer builds "Model Builder" magazine, in? GOLDEN BREAK-IN FUEL contains exactly the right lubricants in exactly the proper proportions to and writer for the leading assure maximum engine life, top power and optimum idle. European model magazine. All Powermaster products are See your dealer today for this and other fine POWERMASTER fuels and hobby supplies, including XL-R-8 CA Accelerator, unconditionally guaranteed Kleenmaster Airplane Cleaner. SuperSanders and Lubemaster After-Run Oil. If no dealer in your area, call direct. You must be satisfied or your money will be refunded. POWERMASTER PRODUCTS, INC. 7807-H Telegraph Rd. Montebello. CA 90640 (213) 887-0801 FAX (213) 887-0804

80 in-oz of torque and the output shaft is supported on two ball bearings. The 735 servos so far have proved excellent. HAVE YOU TRIED FULL-SCALE7 To stringently test the 102 servos that AFTER YOU DID ALL THE WORK, WHY LET come with the Vanguard system, I installed the standard 102 servos in my flybarless YOUR AIRPLANE DO ALL THE FLYING? helicopter. These 102 servos are only INFO $3.00 BUILD & FLY THE miniMAX YOURSELF! bronze bushings, but still provide pretty good centering and have 50 in-oz torque. W ith the 735 servos, if you grab the servo arm and jiggle it, you would not feel any movement. However, with 102 servos you would. But for the price of one 735, you can purchase three 102s. After at least 100 flights on the flybarless machine, the 102 servos are still working flawlessly, but the output shaft began to show slop and wob­ ble. The conclusion is if these servos can survive the torture of a 60-size flybarless ...... ' Computer Designed * 3 Axis Control AWARDED SUN-N-FUN 86 . Part 103 υι,Γ3|ι9Μ . Easy construction helicopter doing so many aerobatic flights, 'Most Innovative New Design" · wood Construction then they are good enough for any 30 to 60-size flybared helicopters. But I advise TEAM INC.. BOX 338M, BRADYVILLE. TN 37026 (615) 765-5397 you to use the 735 servos for any flybarless helicopter. I used the 102 on mine only for to reset the PCM failsafe settings. transmitter, then you are going to crash, testing to see if they would fail or not. The PCM has two modes of failsafe for no matter what! Both Vanguard PCM and PPM receivers emergencies, such as interference or loss In terms of reliability, I trust all modern functioned flawlessly so far; that means no of transmitter signals. In one mode, the R/C radios, even the simple AM sets. crash due to radio problems! All Airtronic receiver will automatically kick the servos Modern radio equipment is so refined that radios now come with AM A gold stickers to user preset servo commands; a popular 99 out of 100 crashes are likely to be due to that certify them as meeting or surpassing choice is low throttle, low collective, and pilot mistakes. Furthermore, all Airtronics the 1991 20kHz narrow band requirement. zero cyclics. In the second mode, the re­ radios, including the Vanguard, meet and The PCM receiver has a special feature that ceiver will automatically remember the last surpass the 1991 narrow band require­ the PPM does not have. The PCM receiver valid radio command and locks the servos ments set by AM A. By 1991, many of your has what Airtronics calls a ND plug. This on the last command position. All PCM present radios, which may be of the wide ND plug will automatically pulse the throt­ radios on the market have these two fail­ band design, will be illegal at club fields. If tle to idle for a half second at one-minute safe modes. I usually use the second mode you do use them you are risking interfer­ intervals when the receiver battery falls because it’s pretty rare that I lose a signal ence by the newer frequencied radio sys­ below 4.1 volts. This is a very nice feature completely. More often it’s only a tem­ tems and pagers that operate in frequen­ which will certainly get your attention porary loss of signal such as may occur cies close to you. It is probably more when you are hovering and the battery is when pointing the antenna at the model, economical to acquire a new inexpensive getting low. I have tested this feature at or a sporadic interference from pagers, or system than to convert your old system. home with a low battery, and it works. metal-to-metal contacts, etc. If I leave it on However, your wide band radios will not However, I have not run my battery that the second mode, the model would just be FCC illegal. If you do not fly near cities, low while in flight tests. This ND feature is ride through the temporary loss of signals, or in club fields, then you can still use not available on the PPM system. The PCM and most of the time you would not even them, say in the middle of a Kansas prairie. system also comes with a different receiver notice it. In this respect, I like PCM radios Let’s look at some of the features on the switch harness. This special switch harness more. But there is another school of Vanguard radios. Besides the failsafe, both permits the receiver to draw a minute thought that PPM is better, because if there PPM and PCM systems have the same fea­ amount of current to keep alive its memory is a glitch, they would like to know. PCM tures: throttle hold, hi-idle, separate dual of your preset failsafe commands. If you does not mean crashproof; if someone on rates for pitch and roll, low battery warning unplug the receiver battery, then you have the same frequency decides to turn on his beep, servo reverse on all the channels.

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 93 electronics inside! I had to send it back. We will have the SG-X gyro for the next HAYES WHIP ANTENNA time. The bottom line is the Vanguard 6H PCM and PPM have been tested in my flybarless helicopter with flawless records. They are two of the lowest priced helicop­ ter radios on the market, yet they have proved to be very reliable in operation. For beginners, I always recommend a heli radio Vertical whip instead of an airplane radio. Vanguard may antenna replaces any not have the extra features that experts demand, like invert switch, multiple idle- 18 or 36-inch receiver up, and multiple pitch curve adjust, but antenna for R/C cars and Turn Cans Into Planes you can buy two or three Vanguards for More than a dozen models with hundreds of variations possi­ the price of one computer radio, and not boats. Connec tors, vertical ble. You can make F4U Corsairs. P-40 Warhawks. P-51 and horizontal mounts and Mustangs. Float Planes, Bl/TRI Planes and more, including necessarily have better reliability. Need MULTI-ENGINE Planes like Twin Cessnas. T-Tail Pipers. C-47's more information? You can reach A irtron­ safety ball all included. and the Mitchell B-25. Cut the patterns from your favorite ics at (714) 830-8769. · beverage cans and staple the planes together. No messy paint­ Stainless spring steel ing and no special tools required. Beautiful works of art that whip only 1/32 diameter for make great gifts your friends will cherish for years. Construc­ tion plans available in four series. High wing planes, Low wing Free Flight Continued from page 61 planes, Bl/TRI wing planes and Multi-engine planes - $10.00 minimum wind resistance. per series - $25.00 for any three series, or $30.00 for all four. Available at your Brochure - $2.00, credited toward any series ordered. trophies at the Max Men 14-Round Inter­ local dealer. ______B.C. Am O r ig in a l s ______national FAI contest at Lost Hills, California, 725 S. 12TH ST. /114-B · BISMARCK, ND 58504 (7011 258-7423 February 17-18, 1990. “ The America’s Cup is presented to the FAI flier w ho scores the highest four con­ test totals taken from a series of designated A.C. contests across the United States and Canada. Thus it can be said that the winners represent the best three FAI F/F fliers in their class for 1989. "The 1989 competition was intense. Seventeen contests comprised the sched­ ule. Since any number of A.C. contests HAYES PRODUCTS could be flown with only the four highest 14325 Commerce Wy. scores counted, a number of 'hard-nosed Garden Grove, CA 92643 competitors’ travelled many miles to pile up points by attending contests across the U.S. and Canada. One or more fliers and gyro sensitivity select toggle switch. cal collective pitch for the top end. Some travelled well over 10,000 miles in their One thing I immediately noticed is that the people may like this because it allows more efforts. We admire such dedication to win­ Vanguard switching directions are oppo­ collective at the top end for that final flair. ning and we much appreciate the overall site that of JR and Futaba. For example, on They may not want that much top end interest the Cup has generated. Vanguard you push the throttle hold switch pitch during normal flight because that "N ow the SCAT Club is accepting appli­ away from you to activate it. O f course, this would bog down the engine. There is also cations for the 1990schedule. Previous A.C. is no big problem, but for someone who a global pitch curve adjustment pot under contestants will receive priority. The new also owns JR and Futaba radios, this can the cover. It would have been better if this schedule will be published, and the rules make him pause for a second during flight. was in the form of a knob located on the unchanged for 1990." I simply rotated the switches 180°, so now outside because it is a frequently adjusted For further information, contact Al all my radio switches are pull forward to parameter. Like all modern helicopter Hotard, 1012 Damato Drive, Covina, Cali­ turn on. radios, Vanguard has separate up/dow n fornia 91724. Phone: (818)966-4788. The throttle hold setting method is very tail rotor mixing trim pots. This is nice be­ WHERE THE HECK ARE ALL THE KIDS? interesting on the Vanguard. There is a cause many prefer to dial out down mixing, As I promised at the beginning of this throttle setting trim pot for throttle hold so in the upside down portion of a loop or month's column, here is a reprint of Ken purpose, but when the throttle is activated, roll the model would not yaw excessively Sykora’s thoughts on the "beginners’ the normal throttle trim also has an effect. to the left. As there are seven trim pots problem ” in free flight today. This article is None of the other heli radios have this underneath the cover, I wish the Vanguard reprinted from the Flightplug, newsletter feature. It seems to be quite convenient could have come with the convenient plas­ of the SCIFS. because I can adjust the throttle hold throt­ tic clip-on screwdriver that is standard on “ Where the heck are all the kids? tle position without opening the cover. Airtronics' more expensive radios. "That seems to be the question for those The hi-idle has only a throttle position trim Besides the expanded scale voltmeter who have seriously surveyed today’s model pot, unlike the JR Century 7 which also has on the transmitter, the transmitter has a airplane activities. Good question, and if a point setting trim pot. As the Vanguard is built-in audio warning that beeps when you are involved in this hobby/sport, cer­ aimed at beginners and intermediates, it is the voltage is low. There is one feature that tainly a serious one that could benefit from proper to keep the system simple and I can’t figure out. Why is the throttle re­ analysis. user-friendly. sponse non-linear? The throttle servo "Step one in such an analysis might well There is only a hi-end pitch curve adjust, moves more at above half stick than below be to take the lack of youngsters in model­ there is no low-end pitch curve adjust. For half stick. The other comment is it would ing out of the context of just this single 'kid people who like to do a lot of autorota­ be nice if all the helicopter radio receivers activity.' For example, where the heck are tions, a low-end pitch curve adjust would came with a shortened base loaded an­ all the skateboarders? And how about be nice. The other unique feature is that tenna and a short rubber ducky antenna those ‘Hot Wheels’ little racing cars? Huh? the hi-end pitch adjustment has no effect for the transmitter. I was planning to tell Time was when the remotest sidewalk or when the throttle hold switch is activated. you about the new SG-X Airtronics gyro paved street was a busy skateboard track, In other words, activating the throttle hold too, but the one they sent me was so new and specially built ‘dromes’ had standing- for an autorotation gives the full mechani- that they sent me the demo without the in-line customers. Hot Wheels, in their

94 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI MODEL BUILDER I φ ιι0 UVeam Scrnpitlnitsh/ researched, with latest Electric technology.

^G reat for AMA Scale or Sport/Stand-Off. H 'M m \ ^ , lifdtfCantilever tnngt DORNIER ZEP DJ 1918 D ural F'»ghter n fT Span SIS t « iS A ttro Geared Cobalt IS or Glow t. {IgP J25SP GCLDEN d A C ? E © 5 C la ssic s

h d u h RW D.8 ST span iSOtsq.'iCh. Seal* folding u-ingi ■ 05 A V IA T J K i R t r f ) SO i Shade 190 00 > hee'.i JUNKERS J.21916 SHOO Catalog refund fur order» o\rrSI5Q 0 A ina* i ny «teef e x p . h a h Add $1 50 for lit C l* » poet. , S T S p a n 5 t * * a ’ iC h Add S3 00 for rollrd pUm A s t r o G e a r e d C o b a lt 05 Add 8 5 * fo r N Y. ra id . Ϋ S h e e t, S...... * \.nc«CA«e* «or I Mm O'Λ tow,

rhkkcrUVmricttt VW^I J i m Sp o r t - S 9 0 S c a le 3 C h . _AIRDROME ------S T S p a n - 1 S h e e t S i5 00 A lb . D i l l • P u s h R o d 1 1 S h e e ts S IS 0 0 ^ /if5 /-D Λ Sto/uw. .Vnr Y o r k 10150 time, were just as popular. Special store­ WE SET THE PACE! front tracks sprang up everywhere, and Made in America W ith Michigan’s most complete supplier of the competitions of scheduled races were American Technology model kits & accessories—if it’s fierce—for youngsters and adults. featured in Model Builder Magazine "And then, suddenly, these two fads had we probably carry It In stock. reached their natural 'time span’ and (mass RJL Manufactures in the U.S.A. We love to help beginners as well popularity-wise) were gone. The reason RJL R/C & U/C ENGINES .15 thru .61 as the dyed-in-the-wool enthusiasts. for this would seem to be that kids—and Forster Glow & Ignition Engines Give us a try! many adults, for that matter—have this FACTORY PARTS & SERVICE FOR: MEMBER attention span that’s about as long as the Radio Control distance between their toes. Combine this HB Engines - Cox Conquest .15 Hobby Trade fact with the wild enthusiasm of youth Kraft .61 - Taipan .40 - HCK Engines Association (when something ‘turns them on') and you Testor/McCoy Series 21 J®E5 get the natural cycle for such fads. They Forster - Remco - Viking twin 7845 Wyoming · Dearborn, Ml 48126 · (313) S33-6567 develop seemingly overnight, burn very C oll or w rite to r free inform ation. 17900 E. 10 Milt Μ . · E. Detroit. Ml 48021 · (313) 7738294 hot for a brief span, and then burn out just RJL Industries 35203 Grand River · Farmington, Ml 48024 · (313) 4778266 as quickly—while the crowd runs (not P.O. Box 5 - Sierra Madre, CA 91025 walks) to the next fad. (818) 359-0016 106 S. Uvemols · Rochester, Ml 48063 · (313) 6518842 "But there is one other feature of this kid-fad phenomenon that is integral to the mass produced gas engines! And modeling the best we will have. Maybe that’s good cycle. Within the ashes of the burnout kids were running in another direction. enough. market, after the mass sales have stopped, "After WWII, modeling really branched JOHN OLDENKAMP’S RUBBER LUBE there always remains a small, hard core of out into C/L, F/F, and R/C and today the John Oldenkamp, one of the San Diego enthusiasts. These individuals, for whatever modeling mass market is of course in radio Orbiteers’ brain trust who helped develop personal reasons, have been locked in to . . . with its unique features of ready made the P-30 and the Pee Wee 30 events, has the activity. It goes beyond being a hobby equipment, ‘audience flying,’ and pro­ found a rubber lube that does the trick for with them and becomes, if you will, an grammed operations. him. According to John, "Some colleagues obsession. For their varied, individual rea­ "Distasteful as this may be to the free snicker at the appearance of my rubber sons, they become attached . . . and will spirited F/Fer, we remind you that popular motors because they look dry. I do lube never, completely, leave this attachment. model magazines still offer columns, pic­ my stuff, not with the usual gunk, but have "N ow , for reasons we’ve never been tures, and articles on a wide range of non- moved over to an STP product called ‘Son able to fathom, those who decry the lack R/C modeling. These hard core areas are of a Gun’ protectant, a water-based poly­ of swarms of ‘new blood’ into modeling very much alive and well, thank you, and mer very similar to Armorall, but which seem to be unaware of this youth-fad-cycle they continue to attract a select few recruits does not contain destructive solvents. So business. Perhaps it's because, when you (young and old), which, 62 years after my lube is invisible, odorless, doesn’t look at modeling history, we've had an Lindbergh gave us that kick in the butt, splash, and it’s cheap at $1.89 per pint. To unusually long run for our money. ain't too bad! So, mass modeling is OK for use, saturate the motors, leave overnight, “ A lot of things came together at just the the masses; but remember that special then pat off the excess. Excellent for tissue right time, when you stop to consider. For areas of the hobby attract a more select covered Old Timers, etc., to avoid the example: when Lindbergh turned us avia­ and limited fe w . . . a special breed of cat.” white lube ‘zits’ that pile up after a few tion crazy at the end of the '20s, rubber Well, that is a different twist to the old flights. Renew the STP application when­ models were on the threshold of advanced worry. It brings to my mind the Marines’ ever you feel you need it. I have fully development.. . and they progressed at a recruiting slogan, "All we're looking for is wound a Wakefield motor 30 times just to rapid rate in the '30s. Here was a creative a few good men!” Maybe that is our free see what the difference might be, and it hobby with a low cost feature (that meshed flight future. A few good men and women, still puts out and has not broken.” nicely with Depression poverty), yet a few good fields, and a little bit of support SOME FLYING THOUGHTS AS I yielded a lot of satisfaction. And, before from the industry and our leaders in the A P P R O A C H THE 1990 CONTEST SEASO N this activity could lag, right along came AM A. That, and good weather, may just be The following thoughts are swiped, with

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI 95 acknowledgements, from the Phoenix points and let it dry overnight or in a low- newsletter, edited by Sal Fruciano: heat oven. I would have entered but I didn’t get it W ith the dry outlines, assemble the ver­ trimmed before the contest and it’s too tical and horizontal tails directly over the windy to do it today and look over there plans using ViOth square sticks for the spars "he" is flying so I don’t stand a chance and and the ribs. Don’t forget to add the little it's a bit cold and I think it might rain.. . . short gusset pieces shown in the acute Highlights from the above excuses: angled corners or you’ll find that the tissue 1. If you do not enter you cannot win. covering will have a wrinkle in that corner 2. If you want to be a competition flier, for sure. you must be prepared to fly in the wind, The wing is assembled in a like manner turbulence, wet and cold. directly over the plan. The leading edge is 3. If you think negatively, you will lose a piece of 1/16th by 1/8th set on edge on this year, and the next, and then give up the plan. The tip and trailing edge is 1/20th BUILD YOUR entirely. square balsa as are the rib bottoms. Add 4. A positive thinker competes against the strut pads at this time. When the wing OWN ROCKET his fellows and wins often, and a negative bottom structure is dry it can be removed thinker competes against himself and usu­ from the plan and the leading and trailing MOTORS! ally loses. edges cracked for the dihedral. The spars WE CAN SHOW YOU HOW! 5. In 99 cases out of TOO, still-air times are cut to match the dihedral and then are totally irrelevant to your chances of cemented to one side of the wing. The winning or reaching the flyoffs. tops of the ribs, sliced from 1/20th sheet, • 40 POUNDS 6. Most competitions are lost, not won. are added next. Now push the spar down THRUST! 7. Only by putting your model into a and cement it to the ribs at the other side thermal, will it max. of the wing. Add the rib tops. Finally, add • 50Φ EACH! Thanks, Sal, I needed that to get my the leading edge sheeting. mind in place for the 1990 season. Before covering the model w ith Japa­ • With a rock tumbler and some simple hand tools T H A r S IT DEPARTM ENT nese tissue, make sure it is sanded smooth we It show you how to build YOUR OWN rocket engines in youi own gaiage 0 1 w orkshop lor 1/5 to Well, that does it for May. Actually, this and that the edges on all the surfaces are l Π 0 the cost ot the com m ercially marketed motors column is being written toward the end of round or tapered as required. Then cover • INTERESTED? Just.send us S2 00 and we II mail you January, and it will be in your mailbox or the model with yellow tissue. (Note: the our biochuie along with a WORKING SAMPLE ol an electric igniter that YOU C AN M A K E YOU RSELF Irom newsstand by early April—so, you can see Vagabond is a private airplane and could materials you II lind around the house why sometimes this business is confusing. I be any color you desire, it doesn’t have to TELL YOUR FRIENDS ABOUT US! Were the DO IT hope that you continue catching thermals match mine. In fact in the late ’50s, I owned YOURSELF ROCKET people and banging rafters at a good rate through N4314H, which was yellow when I bought Write to: Department MB. The Tetetllte Corporation 1990. I'll look forward to seeing your face it and I immediately painted it red and 11620 Kltchlng St.. Moreno Valley. CA 92387-9978 smiling at these free flight pages next white. N4121H was red and white when I month. · bought it about ten years ago and when I rebuilt it the old original yellow color scheme was applied.) SCALE DOCUMENTATION Vagabond Continued from page 55 When the model is covered, spray the tissue very lightly with water to shrink it motor peg is a length of 1/16th diameter taut. When dry, give the fuselage a couple aluminum tube. of coats of dope and the surfaces at least When the surface outline balsa strips one. Assemble the wing and tail surfaces to have soaked enough they can be used to the fuselage, making sure they are in the make the outlines by forming them around proper position. The vertical tail should be a pattern matching the inside of the out­ perpendicular to the horizontal and it lines. For this model the patterns were cut should be lined up with the fuselage center out of 3/32nd sheet balsa and the edges line. were doped and sanded smooth. If the Make streamlined struts out of hard outlines were to be laminated, the edges balsa and fit them in place between the would be waxed. The wet wood is taped to fuselage and the wing. “ X” marks the spot the pattern where there is a straight section on the wing strut pads where they attach. and then wrapped around the form, being Add the diagonal braces behind the w ind­ careful to keep tension on the strip as it is shield at this point and then install the wrapped so that it doesn't kink and break. windows and windshield. Details, such as Tape the strip to the pattern at several the carburetor air scoop, exhaust stack, gas

96 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI MODEL BUILDER tank cap, oil dipstick, tail wheel, tail brace wires, landing gear fairings, and sway MULTIPLEX 9CH PROFI MC 3030 braces should be added now. OK, the "V A C ” is built, how should she NOW AVAILABLE IN THE U.S. be adjusted? First check the balance and add ballast as required to get the model to balance at a point one inch behind the leading edge of the wing. Some ballast will probably be required at the front end because the model has a relatively short nose. Next, make sure the tail surfaces are not warped. Check the wings for warps; if both have a small amount of washout (the tips angle down looking forward relative to the roots) and if it's the same in both wings, that is ideal. If they are not warped, that’s OK, but they should not be warped with washin, or differently. Now take a 24 inch length of 3/32nd BUT ONLY FROM BEE ME R R/C WEST! rubber and make a m otor loop and install BEEMER R/C WEST, INC. it. Your model doesn’t balance any more, 17252 E. FALCON DR., SUITE 3 so re-ballast it. The model should glide FO U N TAIN HILLS, A Z 85268 (602) 837-0311 straight ahead if the propeller freewheels or just slightly to the right if the propeller Send $5.00 for your English Full Color Multiplex Catalog and detailed literature. Shipped U.P.S. No P.O. Boxes, please. (VISA/MC/AMEX) stops. Fifty winds in the motor should give a short, straight, level flight. Adjust the tail surfaces until it does this with fifty turns. Now wind it up about a hundred and fifty turns and try it. The model should climb a GUNFITER little and turn in a wide left turn due to propeller slipstream effects. From here on the flight adjustment should be made with R/C VIDEO thrust line adjustments; side thrust using shims between the nose block and cowl REPORT sides to adjust the turn diameters, and presents... down thrust using a shim between the top of the nose block and the cowl to keep the model from stalling or looping under 1. TOP GUN 1 hr 6 min power. The model in the photos weighs 11 2 . US 89 NATS 1 hr 30 min $2995 Each grams without the motor and requires a BUY TWO OR MORE TAPES small amount of ballast in the nose. It got a 3. US 89 Masters 1 hr 40 min little washout in both wings when the tissue PAY JU ST $2495 Each shrank, which was left in. No side thrust 4. Plus $2.25 per tape shipping & handling adjustment was necessary, but a 32nd shim Special Edition Tape SEND TO: GUNFITER R/C VIDEO REPORT was required to keep the nose from getting SS Special (ALL JET) 1 hr too high under the influence of maximum 2329 Orleans. Suite 2 · Bellingham. WA 98226 winds in the motor. The model has done (206) 734-7279 . over forty seconds indoors. Outdoors it’s 5 Edmonton & Calgary Check. Money Order. C.O.D. Accepted at the mercy of the great thermal gorilla, COMBINED 1 hr 20 min Sorry, no Visa or MasterCard “ Hung.” Have fun with a model of my Piper Vagabond or any other with a different color scheme that you’d like to repre­ velocity in order to keep the Reynolds the triangular sail and approaches zero at sent. · number full-scale. The old NACA-Langley the tip, where the chord is reduced to variable density tunnel was enclosed in a practically nothing. (Boat sails and delta steel shell and could be pumped up to 21 airplanes have similar taper ratios.) Tech Stuff Continued from page 49 atmospheres (300 lbs. per square inch!). Full-scale airplanes may have Reynolds Here is a convenient, simplified formula numbers from about 900,000 for a small with wind tunnel testing. Scale models are which is accurate at sea level: R. N. = 780 VL, ultralight to about a hundred million at the normally used so the tunnels won’t have to where V is in MPH and L is the wing chord wing root of a 747 in a full-bore low pass. be huge, but the R.N. used in the tunnel in inches. Therefore, if we have a big model At supersonic speeds the flow changes tests must be the same as for full-scale if with a sixteen-inch chord flying at fifty completely due to the compressibility of the data is to be exactly applicable to full- miles per hour, or a racer with an eight- the air, and the R.N. plays second fiddle to scale. If the tunnel model is quarter-scale inch chord flying at 100 mph, the Reynolds Mach number. the tunnel velocity needs to be four times number is 624,000 in both cases. If an eight- So now we know what the Reynolds as fast as the real airplane flies! That can get inch-chord model flies at 20 mph, its R.N. is numbers are for various sizes and kinds of difficult. 124,800. An indoor model with three-inch craft during operation. What good are I said we modelers usually don’t concern chord and flying at two mph is at an R.N. of they? Alone, this knowledge is worthless. ourselves with the density factor in the only 4680. In conjunction with a knowledge of the R.N. formula, but some wind tunnels make If you race model sailboats, you may be effects of R.N. on lift and drag, it is very use of it. "Variable density” wind tunnels operating at Reynolds numbers from zero useful. In general terms, the higher the increase the air pressure (and therefore its to around 100,000, depending on how Reynolds number in subsonic flow, the density) in the tunnel instead of, or in much wind you have. Also, on a model greater the maximum lift coefficient and conjunction with, increasing the tunnel sailboat, the R.N. is highest at the foot of the lower the profile-drag coefficient.

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 97 concerning airflow. A high R.N. is "better” major decals Over 750 To Select From than a low R.N., yet aerodynamicists try to ★ 7 1/4 Scale (18 Sheets) develop laminar-flow airfoils (recall that ★ .60 Size (38 Sheets) laminar flow is characteristic of low Rey­ ★ .40 Size (38 Sheets) ★ Propoller Decals W.T. only (6 Sheets -3 sizes on ea.) nolds numbers). Some modelers also try to ★ Kill Markings W.T. only (6 Sheets) get laminar flow—why, I'm not sure—yet ★ Nomenclature Markings other modelers use leading-edge rough­ (3 S iz e s - 12 Sheets) In Black or White copy ★ Letters and Numbers ness or turbulators to get turbulent flow (1/4"-3/8"-1/2"-5/8”-3/4”-7/8”*1"-2"-3”-4"-4-13/16'' (for a delayed stall). in 10 Colors. See color chart.) ★ Flags (American, United Kingdom and Confederate) If one of you who understands this ★ Stars in 10 Colors (9 Sizes plus one Sheet of whole subject better than I do would care Assorted Sizes) to write a short, not-too-technical essay on A Trim Sheets (4-3/4” " 26" in 10 Colors, see color chart) DECALS these paradoxes, laminar "drag buckets,” PRESSURE SENSITIVE · WATER TRANSFER etc., I would like to publish it in MD&TS. Authentic model insignias (pressure sensitive or water transfer) for 1/4 scale. .40 and .60 m ajordecal? I didn’t intend to write a textbook on size propeller decals. World War II kill mark­ Reynolds number here, nor am I qualified ings. stars, flags, letters, numbers and trim sheets. « S fis J FUEL PROOF TESTED 12% to, so let’s see if I can wind this up before I NORTHEAST SCREEN GRAPHICS 21 FISHER AVE.. EAST 10NGMEAD0W MA 01028 TEL 413-525-4110 get completely over my head. Modelers need only worry about R.N. when they are trying to accurately compare the per­ formance of a scale model to its prototype, CAI CACB· When your equipment fails, or when they are involved in a by-the-book ■ K ■ Ram keeps your models safe! theoretical design and need to predict the # RED 09 Battery Backer (redundant Rx. battery system) $39.95 performance of the model accurately. # RED 10 Dual Servo Setter (auto, controls 2 sen/os) $39.95 Then they should either use airfoil data # RED 11 Audio Battery Alarm (monitors 4.8 or 9.6 volts) $19.95 that was taken at a R.N. comparable to that # RED 17 Transmitter Switch Alarm (beeps when Tx. is “ON") $19.95 at which the model will fly, or apply cor­ # RED 18 Big Airplane RF De-Glitcher (kills long wire RF) $ 8.95 rection factors to data taken at a different # RED 25 Big Model Battery Backer (V* scale version of 09) $49.95 (usually higher) R.N. But in the meantime, # RED 32 Battery Peak Detector (protects R/C car battery) $29.95 “ Reynolds number" is a handy technical # RED 37 Simple Senro Setter (auto, controls 1 servo) $19.95 term to throw around to impress people. FOREIGN CORRESPONDENCE THE ORIGINALS... Still the best! We received a letter from Jakarta, In­ • SEE YOUR DEALER · SEND STAMPED ENVELOPE FOR RAM INFO ** ^ money order or full credit card info for the cost of the item plus donesia from )oe Jopling, a reader who S2.00 ($5.00 foreign) for immediate shipment Include full address for U PS Sorry no C O D. bought his October copy of Model Builder in Singapore (his home is in the U.S.). The < R 3 m 4736 N. Milwaukee Ave. — Chicago, IL 60630 first tim e I heard from Joe, he was in Bang­ kok, Thailand and he bought that Model Builder issue in Hong Kong! Some people CUSTOM Build a Paper Airplane surely lead exotic lives. Joe made some USTOM comments and asked several interesting MODEL That Looks Like a Real Airplane f RAFTORS BUILDERS questions. THRUST In connection with my previous discus­ sions of propeller horsepower, Joe asked if thrust isn’t what we are really interested in, and suggested that we hook a fish scale to the tail of the model to measure the thrust. PLANES CARS ~~7 __/~K\TS Yes, thrust is what we are really trying to BOATS TRAINS / ,r0m / PLANS Beechcraft Stagfrerwlne get, but we must have thrust in conjunction IO“ wingspan Why not try an ARF of YOUR choice? High wing. Printed in color, yellow with black detail·W* ·—Λ->. 4| Ι·5 ι·ι a mountain top, however, and energy is required, which means fuel is used. For these reasons, scale models are less will always be turbulent. The “ critical R.N.” The useful energy or work will be the efficient than their full-size prototypes. The range where flow tends to change from weight of the helicopter times the height top speed of exact-scale models (assuming laminar to turbulent depends upon many of the mountain. Power is work per unit scale weight and power) is reduced below things, however. Also, in the real world, time or force times velocity (distance scale and the stall speed is increased to most flows are a mixture of laminar and divided by time). Neglecting forward-flight above the scale stall speed. So scale models turbulent. drag and other losses, the output power is have a narrower speed range than their Conditions may be unpredictable the thrust of the rotor times the vertical prototypes, even if weight, power, and around the critical Reynolds number. velocity, which is the same as the weight other factors are completely to scale. You Figure 1 was taken from page 94 of Darrol times the height of the mountain divided can also see that big models suffer less S tin to n ’s The Design of the Airplane. by the time it took to climb to the top. from Reynolds number effects than small Roughening the surface of a golf ball by I used a helicopter as an example for models. This is one of several areas where adding dimples causes the drag to be simplicity, but a climbing airplane would the Big Bird boys have an advantage. higher than for a smooth ball up to a cer­ be similar. In level flight either vehicle uses Getting back to the flow, which is what tain Reynolds number (ball speed), above all of its energy and power in overcoming Reynolds number is all about, if the R.N. is which the drag for the rough ball is less drag, and we store no potential energy as low enough the flow will always be lami­ than for the smooth. we do in climbing. nar, and if the R.N. is high enough the flow There are some apparent paradoxes I sometimes measure the static thrust of

98 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER an engine/propeller combination with a fish scale as Joe suggests. As long as we stick to the same prop, thrust is really as 1990 CLASSIC R/C SYSTEM MADE good a measure of engine performance as IN SMALL, LITE WEIGHT 1991 NARROW is-cpm, except that tachometers are more U.S.A. BAND TX AND RX WITH HI-POWER, accurate and more convenient to use than HI-SPEED CE-15 SERVOS FOR LARGER spring scales. Also, if we are concerned AIRCRAFT. SERVO WEIGHT .8 OUNCE. with real “ vertical performance" of a NEW FULL-POWER TRANSMITTER HAS model, then the static thrust must be more SERVO REVERSING AND END POINT than the weight of the plane. If the static ADJUSTMENTS STANDARD. DUAL RATES AND MIXER OPTIONAL GOLD STICKERED thrust just equals the weight we could TO MEET NEW AMA SPECS. hover hanging on the prop, if we could keep the model stable. In this case, power PLUG-IN RX WITH DEAN'S PLUGS IS is being expended but it is all wasted in NARROW BANDED TO WORK ON 1991 20 propwash and other losses. No net work is KHZ SPACING. RX ONLY 1.15 OZ. CHOICE being done. OF 75, 110, OR 270 MAH BATTERY. When we go from static engine run-up, CLASSIC SYSTEM PRICES (72 MHZ) to flight, holding the same throttle setting, the air velocity past the prop increases, the 910 CLASSIC R/C SYSTEM. 2 CH (3.99 OZ.) $178.95 angle of attack of the prop decreases, and EQUIPMENT BUILT TO ORDER, 3 CH (4.79 OZ.) $205.95 the thrust decreases. SO ORDER DIRECT. The torque required to turn the prop 4 CH (5.59 OZ.) $232.95 also decreases, so the engine is able to turn WEIGHTS SHOWN ARE WITH 5 CH (5.60 OZ.) $242.95 it somewhat faster, restoring part of the 110 MAH RECEIVER BATTERY. thrust. But the faster we go the less thrust CASH PRICES SHOWN. CHARGE CARDS 5% MORE.20% we have, because the top rpm and there­ DEPOSIT ON COD'S. SYSTEM S & H $9.50. CALIF. ADD fore the power of the engine is limited. We SALES TAX. CATALOG $1.00 U.S.A., $3.00 FOREIGN. are trading thrust for velocity in the power 2828 Cochran St., Suite 281 Simi Valley, Ca. 93065 FAX 8055279114 (CE) (805) 581-5061 formula. The maximum velocity of the air­ plane will be reached where the rising drag 1/5 Scale Kirby Kite curve crosses the decreasing thrust curve. 111 inch wingspan This is illustrated in Figure 2, which I again A Complete Kit: borrowed from Stinton (page 227). Fiberglass Fuselage. Plans, So, thrust we must have, but it is dynamic Instruction Book. or in-flight thrust we are most interested All hardware A in, and that is something we can’t readily Wood Parts measure on our models. We are also most Non-skid backing. interested in in-flight rpm, which we can’t Compact size · 2V« x 3V« measure with an optical tachometer from Perfect fitting angles with the new "MfTER MAGIC*' the ground. We can, however, easily mea­ to compliment your cyanoacrylate adhesives. sure in-flight rpm with a sonic tachometer Use with your razor saw. from the ground. I do it. Remind me to talk "MITER MAGIC" $2.98 about that some month. A vintage sailplane ch RC Shipping and handling 1,00 $230 plus $12 shipping and handling from Total $3.98 PROPS IN SLOTS (Wl residents 5% sales tax) Joe Jopling also writes, "I would like to TRITON MODELS build a delta. I sketched one with the prop DESIGN ENTERPRISE P.O. Box 1157 Rt 5 Βοι la Nm Richmond. Wl 54017 in a slot at the aerodynamic center. All the Kotzebue, Alaska 99752 (715) 246-49*0 movable pieces could be located near the CC, and pitching moments would be mini­ prop slot near the AC and with the slot In the November 1989 issue of Model mized. Later I found that running a prop in taped over top and bottom. My guess is Builder I wrote about some work I had a slot is nothing new; Mikulasko does it all that it will glide much better without the done on a wingsail boat model. O ur editor. the time, but aft. A balsa glider will prob­ slot. It is true that slots can be used behind Bill Northrop, let me get away with talking ably supply a quick answer." leading edge slats, and with slotted flaps, boats in an airplane magazine, then he The reason for cutting a slot in the wing but these are very carefully contoured slots surprised me by republishing that same and letting the prop swing through it is, of that increase the flow over the upper sur­ wingsail article in the winter issue of Model course, to locate the prop over the wing, face to delay stall. I don’t think a slot with a Builder’s sister publication, U.S. Boat & yet get the thrust line as low as possible. prop beating through it could ever show Ship Modeler. As it turned out, that was The key to Laddie Mikulasko’s success that kind of gain. only the beginning of an excursion into with props through slots in the wing is the Laddie’s aft-slotted deltas also suffer model boat writing for this author/ word "aft." His props are back near the some lift loss as a result of the prop slot, but engineer. trailing edge of the deltas. In my opinion, he was willing to compromise in return for In the spring issue of USB&SM I will have putting the prop through a slot at or near advantages he feels he gains from that prop an article on automatic sail trimming, a the aerodynamic center would result in a position. subject which was touched upon in the very poor airplane. My reasoning is based REMOVING SERVO PLUGS wingsail article, and upon which a number on the fact that wing lift results from a The servo plugs are very tight in their of you have asked for more information. higher pressure on the bottom of the wing sockets on one of my Futaba receivers. The After that will be an article titled "Innova­ than there is on the top. That difference in removal chore was tough on my finger­ tion in Sailboat Design," which will discuss pressure would cause massive flow up nails, so I did something about it. The such technical stuff as improved hull de­ through the prop slot, destroying much of photo shows a simple plug-removing tool sign, keel fins and keel wings, automati­ the lift, if the slot is in an area of high made from a cheap pair of tweezers. To cally-shifting ballast, laterally-articulating differential pressure, such as the aerody­ make yourself one, bend the legs far keels, lifting sail catamarans, and hydrofoil namic center (AC). There would also be enough apart to straddle the plug and then sailboats. Still later will appear my story of big increases in drag and propeller noise. bend and file the tips of the legs to fit it. an international champion twenty-channel A test is usually more convincing than a This tool is always in my flight box and is R/C fireboat model. theory, however. Make the balsa glider very handy. Following that, I will discuss the inven­ you speak of, Joe, and glide it both with a BOAT TECHNICAL STUFF tion of a unique marine vehicle called the

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI 99 3ikf> ASSOCIATES F^ESEINITS THE FINEST seaplanes. Yes, I definitely believe in the STARTER BATTERIES. power of crystals. 12 Uolts 4.0 Amp. hour Francis Reynolds, 3060 W. Lake Sam­ BO'P ASSOCIATES w ith mamish Parkway N., Redmond, WA 9805Z SASE please. (206)885-2647. · more than 25 years Enperience In the Design, Manufacturing, and Heli Champs Continued from page 29 Assembling of Nickel Cadmium cells and of quick parts could provide an edge! batteries, now presents Let’s do a run-down of the top ten w in­ th e FINEST STARTER ners on the list. Dobashi works for Futaba, BATTERY FOR YOUR and is Hirobo's demo pilot. Sensui works STARTER, w ith Charger. for Izumi Model Company and is a test Just Charge It once, and pilot fo r Kalt. Curtiss Youngblood is spon­ it uiill last the weekend for Starting your Plane. Also 2.0 and 7.0 Rmp. Hr. sored by CMP. Ishikawa is a Futaba engi­ neer. Robert Gorham is a consultant to his ®®P ffiSSIOfflVES ® ® cg 220541 F°r j*““r 0bra!ur|rte need*’ father’s company, GMP. Ewald Heim is the Pas®, Tin 7Φ7Φ2-2Φ94 (10 01)882=55®? wrixe. designer of Heim model helicopters in Germany. Even though he sold the opera­ RUBBER POWER KITS SUPPLIES tion to Graupner, he still has a pipeline to 1300 R/C BUMP parts. Len M ount runs a family business “NEW” PEANUT SCALE RUBBER SPORT manufacturing his own fiberglass blades, 12&13 FT LONG KITS and fiberglass fuselages. Len is the British OUTSTANDING CONTROL 8.95 demo pilot for GMP. Daniel Graber, a civil MORE ROWER engineer from Switzerland, is the chief test KIT $350.00 pilot for Bernard Sitar. Tim Schoonard, FLYING ACE MOTH $9.95 ANOREASON PIPER CUB needs no introduction, he is the son of MUSTANG ZERO BOSTONIAN PUP $8.95 PRAIRIE BIRD 16 $8.95 usw ceeesfs PIETENPOL LACY Walt Schoonard of Miniature Aircraft. Josef R.O.G. 1ST MODEL $2.95 R/C FLYING WING GLIDER GIPSY MOTH COUGER Brennsteinner, a long time Schluter en­ 59 INCH WINGSPAN, HAND LAUNCH NOSE BEARINGS, BRASS WASHERS. PROPS 4 mT0 9 " thusiast, flew Schluter at all three W orld RUBBER TAN. DUMMY CYL. CLEAR VINTAGE WHEELS. CUFF SOAR · HI-START Championships. Occupations of the rest 300 PLANS. TISSUE.MANY MORE KITS, C02 ENGINES. KIT $ 3 4 .95 of the pilots are shown in the table. The HUNGERFORD SILK A STEEL SPOKED WHEELS common denominator is that most are in 2-3 CH COMPLETE CATALOG $2.00 the technical field. BOX 710399 -MB SANTEE, CA 92072 The Heim design was the most popular model used by the Europeans, and only Peck-Polymers TEL (619) 448-1818 FAX (619) 448-1833 1 ^ 4 Europeans used Heim. There were 11 Heim models entered in the contest. However, only one Heim model placed in the top 10. How Fast I s Your M odel? Even though Heim models never achieved END THE GUESS WORK WITH SPEEDTRAC FLY a strong following in the US, in Europe, MINI-ELECTRIC nearly a third of the modelers fly Heim. With this low tost PC-Compotible Computer Why? Because the truss design is very light Program instantly know your models The Popular, Quiet, weight. The mechanics were specifically performance in Miles per hour, Convenient Way. designed for scale fiberglass fuselages. The Kilometers per hour, Knots & Feet design is simple and has few parts. If we per second • MOTOR/GEAR BOX & look at the specification chart, most of the Measures speed over any distance PROPULSION SYSTEMS Heim models weighed less than 10 pounds. Built in data bose permanently keeps track Send ■ FLIGHT BATTERIES of speed records for all your models ond The designer, Ewald Heim’s Lockheed 286 $1.00 tor • CHARGERS weighed only 9.2 pounds, which was the your clubs models. Complete • PLANE KITS—for small Prints record certificates Illustrated lightest model at the contest! When the Catalog electric gusts picked up, the light 286 was definitely Specify 5 % or 3 Ά diskette with order MINI R/C SYSTEMS affected slightly. But light models are $7.95 generally better for autorotation. E.O.M. Systems PRODUCTS In Europe, there are many small inde­ 9730 Ash Creek Dallas, Texes 75228 i 7871 ALABAMA AVENUE · #16 CANOGA PARK. CA 91304 pendent outfitters making precision metal 214 321 3673 up-grade accessories to soup up the stock Heim. Vario, Peka, W ik, and Hunner are "hydrocopter." It looks a bit like a hover­ jection of unwanted signals possible. A just a few of the many. I built a Heim Bell craft and a bit like a hydrofoil boat, but it quartz crystal cut to a different frequency 222 in 1985, but I have yet to develop a operates on a different principle than assures that our electronic watches or flight passion for it. I think it is an unorthodox, either. R/C models were used in the de­ timers are accurate. When the oxygen is but very innovative, and effective design. velopment program. removed from a quartz crystal the resulting We will do a review on the Heim mechan­ Unlike the wingsail article, these four silicon is the basis of all the integrated cir­ ics soon for Model Builder readers, and additional boat articles won’t also be pub­ cuits in our radio gear and watches. The have detailed comments of its technical lished in Model Builder, so if you have an same silicon is also made into solar cells merits. Meanwhile, if you have questions interest, Bill will sell you a subscription to which we sometimes charge batteries or on Heim models, give Dave Carter, of O r­ U.S. Boat & Ship Modeler. power calculators with. The fiberglass we lando, Florida a call. He is the Heim dealer PARTING WORDS use to build or strengthen structures is, in the U.S. His number is (407) 649-8984, I’m not “ New Age,” but I do believe in again, made with silicon, the chief in­ and he sells Heim’s catalog for $4 a copy. the power of crystals to do miraculous gredient of quartz crystals. Silicone sealer One of the most expensive model heli­ things for us! It is a select quartz crystal cut and o u r silicone fuel tu b in g has an o r­ copter kits at the W orld Champs was the in just the right way, which controls the ganic-like molecule based on that selfsame Sitar Jet Ranger. The kit alone costs over frequency of our transmitters, and another silicon from quartz. I am even grateful for $1000. Daniel Graber was the only contes­ one in our receivers makes excellent re­ the quartz sand on the beach where I fly tant using a Sitar Ranger. Every part was

100 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI MODEL BUILDER handcrafted by M r. Bernard Sitar in his Joseph Brennsteiner, of Austria, used an basement in Innsbruck, Austria. Bernard is electronic rpm governor made by Webra. a fluid dynamics professor at Innsbruck The Australian rpm governor used a Hall NEW! University. Even though he does not fly effect (magnetic sensor) to detect the main model helicopters himself, he has worked rotor rpm, then the signal was fed back to a BY POPULAR REQUEST closely with Daniel to engineer the Sitar black box to increase or decrease the Ranger. Mr. Sitar is also the famous chap throttle to achieve a constant main rotor LARGE SCALE who designed, produced, and sold the first rpm. The technical reason for desiring ENGINE CYLINDERS commercial fiberglass blades for R/C heli­ constant main rotor rpm is to reduce the copters. The Sitar blade designs have not speed stability effect that could pitch the been modified for six years. His symmetri­ model nose up when collective is increased cal and reflexed blades are still competitive in forward flight. In summary, constant performers. Many of the modern fiberglass rotor rpm improves the longitudinal sta­ blades like Vario’s and Len M ount’s are bility in forward flight, and improves ver­ copies and variations of Sitar’s. Sitar is also tical stability in hover. For more details on the originator of the 45-degree sawed off speed stability, I explained it in detail in blade tip. Sitar uses an Eppler airfoil for his Issue 15 of the British Radio Helicopter reflex blades. We will talk about optimal USA Magazine. airfoils for low Reynolds number model A general trend among many competi­ blades in the future. tors was to use low rpm for hover and high If you have studied the table, it is very rpm for forward flight aerobatics. Low interesting to discover that every European means 1200 to 1400. High means 1600 to contestant used fiberglass blades, while 1800. According to John Wessel of Aus­ every American and Japanese pilot used tralia, low rotor rpm improved his hover wood blades. As I pointed out in Part 2 of maneuvers by 1.5 points from each judge. the report, fiberglass blades have the Out of a perfect 10, that is quite significant. potential to be better than wood blades, Again, let’s see the theory behind this. I but the way the model fiberglass blades have also played around with different are designed does not fully utilize the ad­ rotor speed and observed low rpm in vantages that composite blades can pro­ hover improves vertical stability but de­ vide. Therefore, at the present, wood creases longitudinal and lateral stability. blades are just as good an aerodynamic Vertical mode stability improves because lifting device as fiberglass blades. Model low rpm reduces the rotor’s sensitivity to manufacturers need to do more home­ vertical inflow change. Low rpm reduces NJ w ork in this area. They are just copying longitudinal and lateral stability because Molded of high-impact styrene, one from another. In fact, the top five lower rpm reduces the gyroscopic stability. winners all used wood blades. The average Now, for high rotor rpm, the vertical sta­ these dummy cylinders feature blade weight was around 185 grams. bility is reduced (the model tends to float deep cooling fins for utmost The other interesting observation is that up and down), but longitudinal and lateral realism. Both the Wasp and only American modelers use base-loaded stability are improved. Again, the reason is Whirlwind types of cylinders antennas as manufactured by GMP or because increasing rpm increases inflow are available in two different Dean. Europeans and Japanese all let their sensitivity, and increases gyroscopic effect. large scales: l/5th (2 W = 1') receiver antenna dangle below the model. High rotor rpm is desirable for forward l/4th (3" = 1') I have used base-loaded antennas since flight because high rpm quickens all four Kits include assembly instructions. Kraft first made them in 1982, and I have control responses, which is especially Smaller sizes are also offered. not yet had a crash due to loss of range. necessary for aerobatics. High rpm quick­ Base-loaded antennas hide inconspicu­ ens controls because at 1400 rpm the Hiller Note: These units may be modified ously inside the canopy, and away from paddles only deflect 1400 times per minute, to resemble other cylinder types. the metal frames, gears, and tail boom that w h ile at 1800, the paddles deflect 1800 could be sources of RF noises. And, base- times per minute. Furthermore, vertical in­ Send $3 for full-color catalog, featuring loaded antennas eliminate the possibility flow sensitivity becomes less important aircraft paintings suitable for framing. of being stepped on. Probably base-loaded because the model has momentum as it WILLIAMS BROTHERS INC. antennas will catch on in Europe and Japan. travels forward at high speed, thus, the DEPT. MB A very nice thing about this competition model will not float up and down as in 181 PAWNEE STREET was that spectators were allowed to w on­ hover. High rpm improves aerodynamic SAN MARCOS der through the pilots’ tents to see the efficiency of the blades, too. The blades CALIFORNIA 92069 models and talk to the contestants. It was a can now operate at a lower pitch angle to very friendly atmosphere. Spectators were generate the same amount of thrust which stabilize the yaw axis. Gee whiz, otherwise, chatting with the competitors to learn helps reduce the rotor’s profile and in­ even I could take a shot at the trial, because some pointers. U nfortunately, the Japa­ duced drag. Furthermore, high rpm re­ six years ago I developed an electronic nese pilots did not speak any English. duces the ratio between the incoming air­ longitudinal and lateral stability augmen­ However, one of their mechanics did speak flow velocity and blade tip velocity (this tation system for R/C helicopters! The sys­ some English. Gerald Weil, of France, was ratio is called advance ratio). Reducing this tem used four feedback loops for each asking him many technical questions on ratio ameliorates the destabilizing effect axis. It used gyros and accelerometers to Dobashi's machine, but the mechanic was due to the rotor’s inherent angle-of-attack provide angular rate, angular position, unable to handle it all. "N itro, what’s instability and speed stability, which gives linear velocity and linear position feed­ nitro?” In general, there was no rivalry the oscillating phugoid motion. back. The objective was to make the model between pilots, nor manufacturers; they Have I lost you? (No, this puzzled ex­ significantly easier to fly, and to reduce the all smiled and a good time was had by all! pression is normal! wen) The objective of intensity of concentration required for fly­ Truly a successful contest. And get th is . . . this column is to learn, improve, and ap­ ing. Intense concentration is what wears there was not a single helicopter crash preciate R/C helicopter modeling through out and fatigues a pilot. th ro u g h o u t the 164 flig h ts in the fo u r understanding the principles. Let’s con­ By the way, Bendix/King recently in­ rounds! tinue. FAI rules disallow the use of any troduced a full three-axis autopilot for full The Australian team was probably the electronic stabilization device, with the size Bell Jet Rangers. Previously, there were only one to use an electronic main rotor exception of an electronic yaw rate gyro no commercial autopilot units available for rpm governor. At the last World Champs, which adds artificial rate damping to help small civil helicopters like Jet Ranger, or

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 101 shows, it is different from the heavy and bulky Euro style tray. It is made like an The MIDWAY MODEL COMPANY aluminum bracket. Instead of having the MASTER CRAFTSMEN OF QUALITY MODEL R/C KITS neck strap hooking at only one place on the transmitter, ala American style, Kevin's O LD T IM E R KHS--SA JLPLANE KITS--ELECTRIC KITS design hooks at two places on the bracket tray. This helps keep the transmitter level SAILPANE KITS: „ The Sky Knight-05 direct...... 1539.95 just like the European trays. The added The Gnome HLG ...... 139.95 The Lightning—05 d irect...... ! 139.95 The Gnome 2 meter...... ! 156.95 The Fast Eddie 05 direct...... ! 539.95 advantage is that you can now still wrap your hands around the transmitter without ELECTRIC POWER KITS OLD TIMERS KITS: bumping into any transmitter tray. This de­ The Ultra IV Glider-05G ...... >56.95 The Airtrails Sportster 50"...... 544.95 sign combines the leveling feature of the The Electraglide II—05 direct..! !44.95 The Powerhouse 5 0 "...... ! 544.95 Euro style tray with the lightness of the The Thermic Traveler-05 dir. !>44.95 The 70% Bombshell 51"...... ! 544.95 American neckstrap. It is very comfortable, See your dealer or add too. Instead of using velcro to secure the The MIDWAY MODEL COMPANY transmitter to Kevin’s tray, I used double­ P.O. BOX #9 $3.00 per order for UPS. Ca. Res. add sided foam tape. Except, I sort of made the MIDWAY CITY, CA 92655 side facing the transmitter less sticky so it is 6.25% for tax. (714) 895-6569 not a permanent arrangement. This way I can place any transmitter on it, and there is sufficient stickiness to keep the transmitter The Only Way to Fly sitting there without falling. Fabtronics Mark 3 C.D.I pointless system The other gadgetry by Kevin that has proved popular is the power handle and whip cord installation. At contests, you do not want to lug your entire field box from the tent to the ready starting area. There­ fore, the power handle is a compact unit that puts a 12-volt gel-cell battery, 1.5 volt NiStarter, and an electric starter all in a W o rks G reat fo r M o s t portable unit. The $40 package includes 2 and 4 Cycle engines the battery, handle, and a heavy gauge Automatic Spark Control now available coiled wire for the starter. Very neat! See for moat 4 eye)· angina·. Kevin’s ad in the magazine or call him at Complete System (Less B atteries)...... S69.95 (206) 854-8053 for ordering information. (add S3 post, b Hand.) Besides having a well designed and set FABTRONICS up model, it is important to be psychologi­ 375 Itl· Royal· Rd.. Galesburg, IL 61401 cally prepared, and have good teamwork. AAAA SANCTIONED For example, for the three Japanese pilots, 20 YEARS OF EXCELLENCE their caller/mechanic did all the chores. Their caller handled the engine starting, all ☆ preflight checks, picked up the models, delivered the score sheet, etc. The same is MAY 26, 27 & 28, 1990 true with the six-times F3A airplane pattern LOST HILLS, CA “Matched Performance System” champion, Hanno Prettner. He just stood for T O P P E R F O R M A N C E there and mentally focused on his routines K&B ENGINES while his dad, also his caller, did the starting ☆ Airplane Marine and checking. Right before Len M ount’s AN EXCEPTIONAL NEW SHE FOR AN K&B FUELS K&B GLOW PLUGS OU I S 1 A N DIN G W E EK E N D OF F R E E F LIQH t 9 Blends 4 Choices turn, his wife held the umbrella to block “Matched Finish System” the sun fo r him , while Len was mentally ☆ for B E S T A P P E A R A N C E going through the sequence. It is also K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER helpful to have a good rapport between ADVANCE ENTRY & INFO : K&B SUPER POXY RESIN K&B SUPER POXY THINNER the caller and the pilot, and keep the same K&B SUPER POXY PRIMER K&B SUPER POXY PAINT U S f FC K&B MIXING CUPS arrangement for all the practices and con­ P 0 BOX 4203 tests. Curtiss Youngblood always has his CARLSBAD CA 92008 K&B MANUFACTURING dad calling for him. Teamwork and con­ < ί ϋ > 12152 Woodruff Avenue Downey. California 9024 1 sistency produce results. The contest was held every day from 8 MD500. But there were electronic yaw in dimension from the U.S. version, the a.m. to 5 p.m. After that, it was the spec­ dampers like our model yaw rate gyro. guts are all made by Futaha or JR. The extra tators’ chance to let out their itch on the Previously, autopilots were only available difference is that they have three-inch long sticks. There was a special practice field for big military helicopters such as the transmitter sticks, are big in size, and look reserved for spectators to show off how Sikorsky CH-53E used in the failed Iran like a tray. If the transmitter does not have good they were, and also for contestants to hostage rescue mission. The CH-53E was a built-in tray, then they all added a tray. practice. There was some serious hot dog­ one of the very few capable of flying in Their palms were resting on the tray. ging going on! Santos Font, from New total darkness. After two years of research Thumb and index fingers were used on the York, was doing inverted backward loops and one million dollars of investment, sticks. This style gives very precise com­ with his Scout. M ike Robins flew his 1989 Bendix/King has finally produced a low mands for hover maneuvers, but the whole Toledo scale winning Sikorsky Seahawk. cost three-axis autopilot. The unit costs hand, including the wrist, has to move for Unfortunately, radio problems caused it to $40,000. aerobatic maneuvers. This style is not crash only seconds after lift off. Seeing a A gadget that was almost indispensable popular anywhere else in the world. I tried super scale model like that crash really with all the European pilots was the trans­ a tray and reported my results in the Janu­ hurts. Dan M elnik, the Kalt rep, was doing mitter tray (Also popular with European ary '90 issue of Model Builder. After Kevin spectacular hot dogging with his Excalibur. F3A pilots, wen). Even though the Euro­ DeShazer of Kent, Washington, read my He let me fly it. It was smooth and stable. pean brands of radio, such as Ripmax, report, he sent me one of his tray designs. He had the J R-120 gyro maxed out to 100%, Robbe, and Graupner, look very different He calls it the Stabilizor. As the photograph and the model almost hovered there by

102 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER itself forever. Impressive setup by Dan. As I have said before, how well a model flies depends only 50% on the model design, JOHN POND the other 50% depends on the building and setup. The following paragraph is a description Old Time Plan Service given by a friend, Jim O ’Brian. I think it The largest selection of plans in the world at the most sums up why the Japanese team won the reasonable prices. Each list $1.50 World Championships for three consecu­ tive times. "Stopped by the practice field No. 20 OLD TIMER F/F GAS again after the competition flying was over for today. M ike Mas was putting on some No. 20 OLD TIMER RUBBER/TOWLINE wild aerobatic maneuvers, along with his No. 20 OLD TIMER FLYING SCALE A through K low level gyrations. Mike capped it off by No. 20 OLD TIMER FLYING SCALE L through Z doing several backward autos. The Japa­ nese team then came by in their van and New plans prices effective Jan. 1990 to Dec. 1990 made it clear why they were winning. In P.O.Box 90310 complete contrast to the typical American San Jose, Calif. 95109-3310 experts who are busy demonstrating just how great a hotshot they are, the Japanese Phone (408) 292-3382 (Tues. or Fri.) focused entirely on business. No hot dog­ ging. Out came Ishikawa’s two Bell 222s and he proceeded to put in a flight with The Latest In Sport Aviation Accessories each. Lots of stable hovering, followed by A Lightweight Contoured Acrylic Handle for your gel A Solid Lightweight Transmitter Platform celled battery The very clean rolls, loops, and rolling stall turns POWER HANDLE (all contest maneuvers). Incidentally, while and COILED this entire group was focused on checking CORD - Ishikawa’s equipment to make sure every­ • Great for Runway Attachment Restarts thing was okay, Dobashi (the guy in first • More Torque Non-slip Strap for Larger Aircraft Quality place, and going for the World Cham­ Engines Alum inum pionship) was the one carrying the helis • Durable • Solid Walnut Acrylic Pads back and forth and doing everything he • Non-slip Grip could to help. Testing over, the machines • 6 Foot Coiled Cord were quickly loaded back into the van. • Nicad Holster And one guy ran around stomping on the STA BIL1ZO R...... — ...... POWER HANDLE & CORD ...... 4W.W 7 Love it” aluminum cans they drank from and put­ Don Low______COILED CORD O N LY ...... 10.00 ting them back in the cooler they brought. HANDLE. CORD & GEL CELL BATTERY .45.00 KDI 10426 SE 206th PI. The pilots jumped in, and off they went. POSTAGE & HANDLING...... 3.50 Washington Residents Add Θ 1% Kent. WA 98031 · (206) 854-8053 Very serious stuff! There was a job to be done, and no distractions would be al­ lowed." P.A.W. DIESELS We will end our coverage of the third b o l l y J ^ p r o p s : •049 το -35, RC & STD F3C World Championships here. We hope a μ ι ι · ο ν α ι . ft m iN o iv n a iv ic a that you have learned a trick or two. Even Merco CL Engines though the coverage emphasized the Classic CL & RC Plans equipment technology, we should point SEND $1 FOR LISTS & out that practice and skill is what it takes to Merco Parts & Service USEFUL DIESEL INFO. win. The bottom line is, practice, practice, CL Stunt Engine Rework ERIC CLUTTON, and practice! Learn to anticipate the next command needed to correct any per­ CL Kits 913 CEDAR LANE, turbation, rather than wait till the model Catalog $3.00 TULLAHOMA, TN.37388 has deviated. The next F3C World Cham­ Order ϊ (404) 973-0004 pionships will be held near Milan, Italy, in FREEDOM FROM August 1991. Again, it will be in the Aero- TOM DIXON GLOWPLUGS lympic format, where F3A pattern, and F3D AND BATTERIES! pylon racing will be held at the same time. Diesels are quiet and 1938 Peachtree Road. Suite 401 economical—just like a 4 cycle I had so much fun this time, that you can Atlanta, GA 30309 count on me booking for a supersaver glow but cheaper and better! flight to Milan in 1991. Why not come and cheer with me? You can please your wife petitions. Pierre Pignot, France with a shopping spree at the fashion capital The following list of contest officials at Wolfgang Roth, West Germany of the world, Milan, and top it off with a the 1989 R/C Helicopter World Cham­ (Chairman) gondola ride through romantic Venice. If pionships, was provided by Horace Hagen, Kiyokazu Sugaki, Japan a pioneer in R/C helicopter development, you have any suggestions or technical FLIGHT LINE COORDINATOR questions, you can reach me at (301) and Contest Director of the 1989 World Tom Unger 589-0855. Or send a self addressed and Championships. START BOX TIMER stamped envelope, I will respond usually M ike Robins within three days. The address is P.O. Box CONTEST DIRECTOR TRANSMITTER IMPOUND 692, College Park, M D 20740. Horace Hagen Charlie Hamilton FAI JURY Al Seidowski Editor’s Note: Having spent quite a few Tony Aarts, The Netherlands COMPUTER SCORING years as an A M A Nationals and FAI World Francis Deproft, Belgium (Chairman) Decker Doggett Championship judge and chief judge, Chris Greenwood, Australia NEWSLETTER EDITOR we’re well aware of how little recognition FAI JUDGES Robert Sims is given in the press for the hard working Rudy Hadorn, Switzerland FIELD PREPARATION officials and helpers at these major com- Robert Harris, U.S.A. John Sproul

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI 103 λ | » C d r i C n λ η ς IMPORTANT INSTRUCTIONS: Non-commercial (personal items) rate Is 40 cents U LAOOl I I Cl LJ AUO per word, with a minimum of $6.00. Commercial rate is 50 cents per word, with a minimum of $10.00. No ad agency discounts allowed. Phone number counts as two words, name and address counts, abbre­ viations count as whole words and will be spelled out All ads are payable with order, and may be for any consecutive insertion period specified. Send ad payment to: MODEL BUILDER, Classified Ads, 898 W. 16th S t, Newport Beach, California 92663.

HELICOPTER SCHOOL, five days and nights, ENGINES: Four page list of IG N IT IO N /G LO W / EVERYTHING FROM THE NEW AEROPLANS all equipment supplied plus room and board on DIESEL ENGINES, also KITS/PLANS and II, by A C. Anson ($11.50 postpaid) to ZAIC a 67 acre airport with lodge used exclusively for HOBBY ITEMS. Thinning out my collection BOOKS! Archives. Datafiles and much more R /C training. Located in North Central Florida. because of moving. Send $2.00 plus SASE to $1 (refundable) brings complete brochures. Still Owned and operated by Ernie Huber, five time LARRY VANCE, 5046 SCHUMANN DR.. LAS available. PEANUTS & PISTACHIOS #4: $7 National Helicopter Champion and Helicopter VEGAS. NEVADA 89102. postpaid. HANNAN'S RUNWAY. BOX 860. designer. Get the hands on training you need MAGALIA, CA 95954. NOW! Send $2.00 for complete package to R / C GRUMMAN F4F WILDCAT KIT #11,1 /2 4 BERKELEY, CLEVELAND, etc. replica kits, Flight Training Center. P.O. Box 727, Crescent scale, rubber powered. Complete kit with de­ duration rockets for jet models. Send two City. FL 32112-0727 cals, canopy, documentation, hardware, in­ structions, etc. First of a series from Flying Scale stamps to: WILLAIRCO, 2711 Piedmont Road MAKE A BEERCAN BIPLANE, 9 inches long, Models of WWII. Price $19.00 plus $2.50 ship­ NE, Atlanta, Georgia 30305. with 14 inch wingspan Instructions, photo­ ping. Catalog $1.50. Diels Engineering, Inc., Box WANTED: Torpedos, plans or information. graphs, patterns. $10.95 plus $1.00 postage. Kit 101, Woodville, Ohio 43469. "Super Shark” or "Tiger Shark." $20.00. Eugene Nine, Box 72104, Marietta, Georgia 30007. INFLATABLE AIRCRAFT: SPACE SHUTTLE— Turner, 12469 Walsh Ave., Los Angeles. CA GIANT SCALE plans by Hostetler. W e fly what 17", BLUE A N G E L -2 3". AIRLINER— 25". WWII 90066. we draw Send SASE to Wendell Hostetler's PLANE-20", F-16-20", $3.99 plus $1.00 for Plans, 1041 -C Heatherwood, Orrville. Ohio postage. H.M.T &V, Box 313, Brockport. New ANTIQUE & OLD TIMER PARTIAL KITS also 44667 York 14420. custom 1 /4-sca le kits, any plans. Send large SASE for each price list wanted. MC, Visa ac­ SCALE RUBBER PLANS. Over 50 Collector's WANTED: Model engines and race cars before cepted Klarich Custom Kits, 2301 Sonata Dr., quality plans. Scale 3 /4 " to foot. Spans to 34" 1950. Don Blackburn. P.O. Box 15143, Amarillo. Rancho Cordova, California 95670; (916) 1915'sto 1940's Golden Age. American Military, TX 79105; (806) 622-1657 635-4588. British, French, German, Japanese. $6.00 each PPD. SASE for list. Flying Scale Inc., 1905 SCALE DOCUM ENTATIO N— Drawings, photo BENCH DRILL PRESS $74.00. five speeds. Colony Rd.. Metairie. LA 70003. packs, monographs, unusual aircraft. Illustrated 1 / 2 ” chuck. 1 / 3 HP. 8" swing, all ball bearings, catalog. $2, pp. Bill Young, 8106 Teesdale. warranty. SK Machinery Inc., Box 20063, Keizer, 1930s MODEL SHOP1 Sawed prop blanks, North Hollywood, CA 91605. OR 97307; (503) 393-7499 W W I/Balloon/SIream line balsa wheels. Hinoki wood, color nitrate, slicks, lissue, bobbins, prop CHINESE— It's the year of the dragon, and you ALLOY CAP SCREWS! We are so anxious to hinges, bamboo, old Scale/Contest plans, and can name your planes in genuine Chinese. You get acquainted that we offer you: four each, more1 Illustrated mail order catalog: $2 Oldtimer decide any name, we'll translate it and illustrate 6-32 x Γ socket head cap screws, blind nuts, Model Supply, P O. Box 7334, Van Nuys, Cali­ how to paint the words on to your planes. Look flat and lock washers (16 pieces!); a coupon fornia 91409 unique on wings. $1.50 per word, $1 S&H. Ex­ worth $1 toward your first purchase; plus our clusively at: Tang, Chin Translates. USA Med- catalog. Send $1 (no checks) for postage and WANTED: Pre-1950 model airplane engines dac O R. sec., Ft. Ord, CA 93941 -5800. handling to: JERIC Corporation, Dept MB1, P.O. and model race cars James Clem, Box 524 Box 385, Narrowsburg, NY 12764 (one offer per Sand Springs. Oklahoma, 74063 (918) R/C BEGINNER PUBLICATIONS: "WHAT customer). 245-3649. MUST I BUY BESIDES THE KIT?.'' from building board to airborne. $2.00 pp. "EASE-OF-FLYING "METICULOUS" 1930's SCALE AIRCRAFT CARBON FIBER: sheets, rods, tow, mat. tail- RATINGS OF R/C TRAINERS", what's easy, PLANS by Vern Clements (MB), 308 Palo Alto. boom. Other Free Flight supplies. Send SASE what isn't. $3.00 pp "LEARNING TO FLY R /C Caldwell, ID 83605. Catalog/News/lnfo$3.00, to: Bradley Model Products, 1337 Pine Sap Ct., WITH OR WITHOUT AN INSTRUCTOR." in­ refundable. Orlando, FL 32825. cludes trouble-shooting flight problems, $2.95 plus 65C postage. "RADIO INSTALLATIONS CROWD PLEASING AERIALS: BUILD 4 ANTIQUE MODEL IGNITION PARTS AND CONTROL SYSTEMS." $3.25 plus 850 OUNCE, 2 WATT. 2-1/4''x4” COLOR TV CATALOG. 1990, Timers, Tanks, Needle postage. All four: $11.00 postage paid. Jim TRANSMITTER, UNDER $120. Best, easiest Valves, Cylinders, Points, Pistons, Drive W ash­ Waterman. 3818 Deerfield. San Antonio. TX available. Complete plans, inexpensive mini­ ers. Plugs. Operating Instructions, Engine Kits. 78218. cam info. $9.95 + $3.00 Rush S&H. Satisfaction Engines, Atwoods. Cyclones, Delong, Others. Guaranteed. SUPERCIRCUITS, 1403-D Bay- 1,000 Parts. $8.00 PP„ Foreign $16.00. Chris RUBBER POWER KITS AND SUPPLIES our view. Hermosa Beach. CA 90254; (213) Rossbach, R.D. 1 Queensboro Manor, Box 390, specialty, also FF Gas and Electric. Send $2 to 372-9166. Gloversville, New York, 12078. Airmen's Supply Co., P.O. Box 1953, Norfolk. Nebraska 68702-1593. WANTED: Ace Baby and Baby Twin radio sys­ SCALE DOCUMENTATION PLAN ENLARG­ tem. Jack Wallace, 5516 Gilbow Ave.. Fort ING Photopacks, three-views, drawings for Worth, TX 76114; (817) 732-5189. 1800 aircraft. Super Scale R /C plans for Giant. ENGINES: IGNITION, GLOW, DIESEL. New, Sport. 82 page catalog $4.00. Scale Plans and used. Sell, trade, buy. SASE for list. R. Eierman, FREE RC CAR PARTS CATALOG. One of the Photo Service. 3209 Madison Avenue, Greens­ 504 Las Posas. Ridgecrest. CA 93555; (619) largest selections. 1-800-HOBBY-98. Hobby boro. North Carolina 27403. (919)292-5239. 375-5537. Stop, 10002 Aurora N.. Seattle. WA 98133

OPEN SCORERS Helene Knaus had been arranged, but I did not know Dave Carter Sigrid Stolley what time or how he would arrive in Lake Chuck Crookshanks SCORE RUNNERS Havasu. It was late Wednesday night and Tony Culver Beth Robins he had not yet checked into the hotel.. . I Alex Gauss Sigrid Stolley was exhausted and there were four long Bill Johnson FIELD MARSHALLS and tough days ahead ... I hoped when I Jonathan Jordan Walter Knaus got up in the morning things would go Nick Mocca Datu Ramel better. John Sproul Mark Wilson · Thursday morning I called the hotel at Jay Wolkowisky 5:00 a.m., the English judge had not FREQUENCY CONTROL Havasu Continued from page 21 checked in . . . not what I wanted to hear. I Chuck Ahern hurried down to the Nautical Inn. Entrants Bill Hershberger a bit late to search out another. Maybe were waiting to get in. NO JUDGES ANY­ George Steiner someone who was at the event would WHERE! Registration began, safety inspec­ Don Griffin q u a lify .. .at least I would have two judges, tion began, everything was going great, TABULATION although three is much better. The English except NO JUDGES! Naomi Griffin judge was due in Wednesday, his room When one is in full PANIC, time passes

104 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU) MODEL BUILDER Ace Radio Control...... 75 INDEX TO ADVERTISERS Ptastruct ...... 89 Airdrome ...... 95 Powermaster Products In c ...... 93 Airtronics In c ...... Cover 2 Altech M arketin g ...... Cover 4 Gunfiter R/C Video Report ...... 97 R/C Buyers Guide ...... 72 American Junior Aircraft Co...... 92 R/C Helicopter C h allen g e...... 27 Associated Electrics...... 73 Hayes Products...... 94 RJL Industries ...... 95 Aviation Art G allery...... 74 High S k y ...... 88 Radio Controlled Models (RAM) ...... 98 Historic Aviation...... 1 Rahm's Winches & Retrievers...... 86 B.C. Air Originals ...... 94 Hobby Dynamics...... 45 Repla-Tech International...... 96 B & D Model Products...... 90 Hobby Horn ...... 86 Robert Manufacturing...... 84 B S P Associates...... 100 Hobby Lobby International...... 84 Rocket City Specialties...... 87 Beemer R/C West DisL Inc...... 97 Byron Originals...... 68 IMS Atlanta ...... 78 Sabo Designs in Paper...... 98 Indoor Model Supply ...... 92 Satellite C ity ...... 66 Carl Goldberg Models ...... 69 Innovative M o d e l...... 88 Schlueter F/F Models ...... 107 Carlson Imports...... 82 Sheldon's Hobbies...... 87 Charlie's R/C G o o d ies ...... 99 J'Tec ...... 82 Sig Manufacturing Co. In c ...... 4.5.65 Culpepper Models Inc...... 88 Jim Walston Retrieval Systems...... 89 Custom Electronics...... 64 Joe's Hobby Centers...... 95 T & D Fiberglas...... 85 Cygnet Software...... 82 John Pond O /T P lans...... 103 TEAM In c ...... 93 Technopower II In c...... 91 Davey Systems Corp...... 77 K & B Manufacturing ...... 102 Telefllte Corporation...... 96 Design Enterprises ...... 99 K & S Engineering...... 80 Thorpe Engineering Corp...... 79 Ou-Bro Products...... 90 K.D.1...... 103 Tom Dixon ...... 103 Kustom Kraftors...... 98 Triton M odels...... 99,107 Eastern Tool & S u p p ly...... 107 Kyosho ...... 67 E.O.M. Systems...... 100 US Free Right Championships...... 102 Leisure Electronics ...... 81 US Indoor Championships ...... 91 Fabtronlcs ...... 102 Flyline Models ...... 90 Major Decals...... 98 VL Products ...... 100 Fox Manufacturing Co...... 70 Midway Model Company...... 102 Victor Model Products...... 64 Futaba Corp. of A m erica...... 108,Cover 3 Mlllcott Corporation ...... 76 Vlnnie Pin Striping In c...... 85 Miniature Aircraft U S A ...... 71 G.M. Precision Products ...... 96 Williams Bros...... 101 Galaxie Model Co...... 107 P.A.W. Diesels ...... 103 World Engines ...... 3 Gorham Model Products...... 76 Peck-Polymers...... 100 Yellow Aircraft & Hobby Supply ...... 83

very slowly, a minute delay seems like an just in front of them in the coming days, would carefully approach the stalled air­ hour. M r. Robert Hirsch, one of the origi­ there would be thousands of spectators craft, the retrieval crew would center the nal five judges, showed up. No time to watching the races, admiring and purchas­ aircraft over the platform, it would then lift brief him. Someone suggests a guy who ing the wares these manufacturers had the aircraft out of the water, and return to has judged at the Scale Masters, or the brought to demo and sell. shore, where the pilot and crew would Nats, or something. Great! At least we had Friday, Nov. 10th take over. two, and when the English judge arrived, We got through Thursday, with most Most of the pilots had no problems and we would have three ... I told the two things looking better. Friday morning pre­ put on a fantastic show. By the end of the judges to begin judging so we could get sented another surprise. This year we had day, after each pilot had flown two heats, a the show on the road. combined the London Bridge Seaplane pattern was beginning to appear. Some Let me state, for the record, I do not in Classic with the Schneider Cup event. To had had near-perfect flights: with their any way blame these two judges. They did our surprise, we had over two hundred static and speed scores added, the com­ the best they could, and in areas were very fun-fly aircraft to enter (only 45 had pre­ petition was extremely close. Four pilots good. But instead, I must accept all criticism entered). Registration once again did a began to bunch up at the front of the point for the inconsistencies that followed. If I great job. Safety inspection and impound standings, but no one had a lock on this had kept my wits, I would have explained geared up to handle the crunch. The RC event yet. The Schneider Cup aircraft were the proper criteria, and made sure each AREA TEAM FLYERS opened everything transported a short way to the Convention judge was clear on the method of judging up with the release of hundreds of red, Center for public display, and later they from documentation, rather than, in some white, and blue balloons, a three-aircraft would be left there intact and be charged cases, from previous knowledge. My hat is fly-by with smoke, and the playing of our overnight. During the public display, off for their fine effort, as there were many National Anthem. They did a terrific job, videos were playing that showed some of fine aircraft to judge. and everybody had a lump in their throat. the models flying, along with some footage From here, final safety inspection, and Flying began behind schedule, and the of the original races, to the delight of all. the aircraft/pilots were transported to the whole day was a bit of a rush. The Schnei­ Oursincere thanks to Thomas Foxworth, SPEED TRIAL course. Here, Frank Kelly's der pilots were ready on time. In groups of who transferred some of his original film timing team of jack Roister, Al Gambee, four aircraft, they launched and flew coun­ footage of the 1925 and 1927 races to video and Doug Huntley, did an incredible job terclockwise around a triangular course and sent them out for our viewing plea­ of timing these racers. Six competitors that had the first pylon some hundred sure. In his film there was footage of the scored four percent or less off of a perfect yards to their right, made a sharp left turn, Curtiss R3C-2, Macchi M33, Gloster III, scale speed, with Ken Bundt and his down the back straight some two hundred Gloster IV, and several other aircraft. Dick Supermarine S-6B hitting the speed right and thirty yards, another sharp left turn Skoglund also sent us a portion of film on on the button. and flew nearly straight at themselves for Schneider racers that showed Curtiss Not all competitors successfully com­ about one hundred yards, and another racers. Supermarines, Navy W right, and pleted this portion of the event, and several left-hand turn toward the Number One Macchi racers. Of particular interest was were in no condition to fly after their speed pylon and into the second of ten laps, after the part about the Macchi MC-72, its attempt. Bill Young’s electric powered which, when clear, they would bring their counter-rotating propellers, and the ulti­ Macchi 33 got airborne, but soon rolled aircraft down onto the water and taxi back. mate seaplane speed record. over and disassembled itself on the water. If for some reason their engine would quit, Saturday, Nov. 11th While we and our competitors were get­ J.T. Scott had engineered and built a special Saturday was the final day of competition ting our task out of the way, the manufac­ retrieval system. A four by six-foot platform for the Schneider racers, and the point turers were arriving and setting up their was fabricated in front of J.T.'s pontoon standings were very close. The top con­ booths. They set up on the grass just in boat. This platform would be lowered tenders were serious and all business as front of the Nautical Inn guest rooms, and hydraulically beneath the water, the boat they prepared for two more heats to see

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI 105 Plan prices subject to change without notice. 106 city. He stated that “ . . . over fifty years ago, fifty over . . . “ that He stated city. Schneider the of contestants the flyers, fun titors good luck and for everyone to enjoy enjoy to themselves. everyone for and luck good compe­ the titors wished and event fine this for Hawks Desert the and Committee, Cup der spanschannel the bridge majestic day, that the with ended Races Trophy Schneider Great the London, in Thames the spanned fair our to manufacturers the and Cup, r lng s k,t toa Ant m e th n A ational N e th sky, oke, sm orning g m ilin blue tra cloudless the across flyers fun the race, tight the anticipating who would prevail as the 1989 Schneider 1989Schneider asthe prevail would who here in Lake Havasu City, and it is only Cup only is Schneider it First Annual and the that City, fitting Havasu Lake in here To­ Britain. Great by win consecutive third Bridge London the where from far not the buoys and w ere ready, the Desert Desert the ready, ere w and buoys the placed had boats recovery the eager, were Cup Champion. Cup Mayor went on to compliment the Schnei­ the compliment to on went Mayor the spectators, the welcomed City Havasu scores that varied so little that if any pilot any if that little so varied that scores meet to ready all were aDepperdussin and to dropped had hunt the continue to able Cup Schneider of heat as first up the went The .” re e h place take ent e-Enactm R RC Aero Show Team aircraft streaking streaking aircraft Team Show Aero RC three the with ready, and had Hawks things the challenge and their pilots flew their their flew pilots out. their hearts and challenge the Sopwiths, Macchis, Curtiss, consolidated. Supermarines, were heats the and eleven, still racers of number huge The racers. these vintage into really was crowd the that wasIt obvious engines. their racers started M a g a zin e In c lu d e a p ep rln i o f th e c o n s tru c tio n a rtic le , H , le rtic a n tio c tru s n o c e th f o i rln ep p a e d lu c In e zin a g a M l ng I r i saapar he ari e. le rtic a e th f o rt a p srara s n tio c tru s In g in ild u b ED O MdlPa Service Plan Model TO: SEND 9 . 6h t. e otBah C 92663 CA Beach, port New St.. 16th W. 896 lue balloons drifting skyward. drifting balloons lue layed, with hundreds of red, white, and white, red, of hundreds with layed, $10.00 ERSATZNo.5901 BOMBER α50O RSDR $600 590-OTCRUSADER Να α17-TTETNTRO $8X0 1173-OTTRENTON Να TERROR α830 13 RBE OE $5X0 RUBBER 1931 873-0T MODEL Να α83 FKE -I $10.00 F0KKER 8731D-VI Να o 91 IKR ET $5.00 No. VICKERS4901 0ELTA N lSie pl ehasad fom m fro d a s a h re u p s n la p ize ll-S u F AN The crowd, estimated at 5,000 plus, was 5,000plus, at estimated crowd, The n sot peh te ao o Lake of Mayor the speech, short a In After the Mayor’s speech a huge roar roar huge a speech Mayor’s the After Superb piloting brought incredible flight flight incredible brought piloting Superb Minimum order: $10.00 order: Minimum 4 pn .0eg.Ae McLeod. Alex engs. .20 span,54" build, scratch or Twin-Stik Midwest Adapt o Rmie' 3" pn ubr cabin rubber 1940 October span from model 38" Romeiser's Bob pn3" Nwpasb Pi Bernhardt. Phil by plans New 38". Span ipe ie. erw b hl Bernhardt. 6'. Phil by Span Redrawn lines. Aces. Simple Flying 1938 from job Gas job. rubber fuselage 1931 setting Record Foster. C. Philip By engines. .40 and R/C for scale 2"=Γ at fighter biplane WW-I Delta. (Northrop) Vickers Canadian WW-II obesz ony Peanut. Mooney Double-size PLAN SERVICE PLAN 74 646-8831 (714) WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOUI SENT BUILDER MODEL ’EM TELL ADVERTISERS, CONTACTING WHEN MODEL

r Trails. ir A

OE BUILDER MODEL

A dd 5 % to c re d it card orders. C alifornia alifornia C orders. card it d re c signature. d n to a e date, % n 5 includ tio ira isa p V dd x r A e o ber, num astercard M card C.O.O.'s. and r o sh a ca d a n a C s e d lu c (in . ndling rs a e h rd o and g in p s ip a h s rse for r ve e O rd o total f o % 0 2 U.S. funds, draw n on U.S. b a nk. P lease, no no it or em R lease, r P e rd O nk. a b order. ney U.S. o M l on ta n l to draw tiona f o Interna funds, % U.S. 0 by 5 ent d d a paym add ) FPO, xico e M and O P A g in d lu c in orders, U.S. residents add 6 -1 /4 % sales tax. sales % /4 -1 6 add residents could not win, but the rules of competition competition of rules the but win, not could special Participant Plaque went home with with home went Plaque Participant special competitors these winners! of were all others, of sands of sweetness the taste to one but pions allows ischam It these of place. all that fifth sad and first indeed between ence Cyclone Cyclone S5), as (Supermarine finished Heitkamp Bob competition follows: flying and static ortal m im ore m many bring ill the w that re hope tu let’s fu and true, come the dream made They competitors. these of each differ­ the mean could it mistake a made spin when the engine is idling. As Cyclone As Cyclone is idling. engine the when spin an­ or reason one for but competition, liff C ighth; E ), -52R M acchi (M Schulz Larry Sixth; Tabloid), (Sopwith Schoening R3C-2),Third; (Curtiss errill M Ken Second; asI thou­ feel, But did One. Number being venient as the cone-start system, and the the and system, cone-start asthe venient shaft. beginners. the for engine work the some This reduces to align to shaft starting Dolan, Derek John Burton, Ralph Sutherland, Larry Walkington, ilos, M Steve the all complete to able not were other, and inth; N S6-B), arine (Superm Adams Frank ; ifth F -72), C M Team acchi (M Fourth; M-33), acchi M (Macchi S6-B), Curry arine Bill uperm (S undt B Ken First; memories. that you fabricate an extra wire bracket bracket wire extra an fabricate you suggest We that Fur­ takeoff. before startings. securely belt away the tuck you engine that sure make thermore, during · flywheel engine is no there method, has abelt-start Keele. score: final a obtaining for requirements Tenth. (Deperdussin), Skoglund Dick Paul S5),Seventh; (Supermarine Botsford with a hook at the end to further secure secure further to belt. end the the at hook a with engine the in caught gets con­ assometimes belt not it’s archaic this that is of system drawback belt-start the However, Eldon and Mclnnes, Ian Cumins, Douglas Young, Bill Wilms, Dave illan, acM M Doug a/lwel nt a b rmvd n 60 en­ in four the removed and loosening be simply can engine by seconds unit whole the fan/flywheel shaft, starting a engine and fan to be removed without without removed be to fan and engine a has which shroud, cooling Cyclone of design the unique The bolts. mounting gine without is that, system belt-start Cyclone's big opening on the bottom, allows the the allows bottom, the on opening big eoig h fn hod O cus, a course, Of shroud. fan the removing The ten competitors who completed the the completed who competitors ten The The following modelers also entered the the also entered modelers The following a with along appreciation, sincere ur O On the other hand, a side benefit of of benefit side a hand, other the On NEW ORDERING INSTRUCTIONS ORDERING NEW C ontinued from page 44 page from ontinued C the small bottle, then it means you should should you means it then A bottle, small the finish not together. did If you them is included. bottle glue small to MEK them enclosed trim to need not do You shape size. right the and to pre-cut all are canopies piece. asolid became canopy the cockpit, The manufacturers. acetate, clear other as the by all used of instead plastic ABS white control by sliding the entire swashplate up up swashplate entire the collective sliding by obtain control helicopters Schlu- These or ^s ter’s. M G X-Cell’s, say, dif­ are than, setup ferent control collective and control cyclic two These right. all are controls plain the Even with down. cost supported the keep bearing to ball are con­ bellcranks f the o trol none As II. helicopter, beginner Cyclone sive for checks preflight and ful when using MEK. A drop in the eye is wen) eye vision, the its in to fatal drop instantly A MEK. using when ful immediately. together them push sides, then both to glue the apply you plastic glue to used is that glue liquid the isthe use do to have you scissors.All with the to gluing and the together, gluing halves upon two flimsy However, and acetate. brittle than more be to seems ABS struction manual says there is an optional optional isan says there manual struction and expand, to side This heat. particular the that toward allows side the inward Hold it. curved soften to stove kitchen sixinches a about over it holding by straightened wire pokes a scissor mixing unit up and and up unit The mixing shaft. scissor a rotor pokes main wire thick 10mm side the the on of groove recessed a inside wire col­ Cyclone, the On only. for controls swashplate cyclic the reserves Kalt controls. cyclic for swashplate the tilt and down, and inexpen­ an be to issupposed II Cyclone shroud. Therefore, model and full-size full-size and model the of Therefore, bottom shroud. the at out leak can air sure cooling a cool­ some lose such you isthat of design shroud disadvantage slight model airplane kits together. Be sure that that Besure together. kits airplane model to issimilar MEK glue. more on put have the that is kits Kalt ith w feature A well. unique very lasted has canopy the Sofar, the sideframes; the optional support is not support optional the sideframes; the in­ The tube. the straightens automatically be can tube The inside. fit to had to tube plastic bent be control rotor tail long Kl fe ln htf lp Vr nice. Very clip. shutoff line fuel Kalt a My time. flight of 20 minutes a good vides spot flat the shaft, this onto tightened are fits that shaft pinion steel the isthat detail on o ay h cletv pth This pitch. collective the vary to down a steel by sliding is achieved control lective helicopters’ Kalt slopless. and taut are runs cyclic roll and pitch the bellcranks, plastic ally means a loss of efficiency somewhere. somewhere. efficiency alossmeans of ally usu­ Easeas maintenance such this. offs of pres­ high compressed The efficiency. ing boom is already quite well supported in in needed. supported well quite already is boom Cyclone kit even included a fuel filter and and filter a fuel included even kit Cyclone pro­ It big. is kit the in included gastank The set the screw. for grip a better provides screws set the When it. on hasfiled spot housing a flat bell clutch the of center the in go dsg cls o te et o ­ com best the for calls promise. design good A trade­ design of full are designs helicopter Kalt tail boom support. We believe the tail tail the believe We support. boom tail Kalt New Kalt canopies are form ed from from ed form are canopies Kalt New Due to the size of the shipping box, the the box, shipping the of size the to Due Now, we will discuss the control setup setup control the discuss will we Now, Another example of Kalt's attention to to attention Kalt's of example Another MODEL BUILDER MODEL (Be very very care­ (Be method of separating the collective and cyclic controls usually gives a very nice and ^Challenger 539 95 ^ OLD TIME STUNT - LEGAL tight cyclic control setup. The added bene­ designed dy: Bill Noyes fit is that this method eliminates undesir­ able cyclic change as collective pitch is A 'FULL STUNT' profile model kit varied; which is a common kinematic AREA 5Θ7 SO.IN. -35 to .45 ENGINE problem found on rising/lowering swash- SPAN 52 IN. plate helicopters, such as Heim, GMP, etc. On Kalt’s 60-size Excalibur, which has a ball bearing supported collective pitch (L to Rl Ed Southwick. Tad Fancner, change lever, and ballraced scissor mixer, George Aldrich, designer B U I Noyes, 'SUPER’ ZILCH end Paul Kslksr. These end »eny Jim S a ftig you have precise collective control. How­ ...... pe at designed by: , υ»··υiwnahIPS. ever, on the Cyclone II, the collective pitch Ca.. Fab.. 1089. 1947 Vintage 496 sq. in. change lever and the mixer do not have .29-,45 GLOM $45.95 ball bearings. If you put your hands on the .35-.65 IGNITION main blades, you can easily feel a play of BALAXIE MODEL COMPANY 1947 'LIL' ZILCH $32.50 one degree collective pitch change. In Box 4842. Covina. Ca. 9 1 7 2 3 Dealer inquires invited hover, sometimes the main rotor rpm (Β1Θ) 967-0074 changes by itself due to the slop in the collective pitch mechanism. We feel this is S c h l u e t e r F ree F light M o d els the only area that needs to be improved. WHOLESALE / RETAIL ADAPTOR The suggestion may be to machine the THROW A WAY YOUR COLLETS, CHUCK t WRENCH. USE OUR sliding mixer’s base out of aluminum, or ADAPTOR $! KEYLESS CHUCK, i add a 10mm i.d. brass sleeve inside the (0 TO 5/32* CAP.TOHAll existing plastic unit. The other suggestion IDREMEL POWER TOOLS. is to have two ball bearings at the collective RUNS 100% TRUE $ pitch lever’s pivot. These two modifications CONCENTRIC AT FULL RPM. PACIFIC ACE (PA) BLACK BULLET ( BB) probably should be implemented by Kalt, NO. 501 · ADAPTOR + KEYLESS CHUCK · $18.95 or by modelers who already own a Cy­ K IT NO. PRICE EACH POWER (DREMEL 850,395 DO NOT NEED ADAPTOR PA OR BB—20” $ 7 .9 5 RUBBER TO USE KEYLESS CHUCK) clone, and are thinking of upgrading their PA OR BB—30" $ 1 4 .9 5 RUBBER Cyclone for aerobatics. Alternatively, re­ PA OR BB—40" $21.95 RUB/GAS STEEL SAW AND ARBOR place the plastic sliding mixer with a $90 KITS CONTAIN ROLLED PLANS, SELECT PRINT HARDENED, GROUND $ POLISHED STEEL ballraced, rpetal GMP washout unit (CMP & STRIP BALSA, WIRE, WHEELS, PLASTIC PROP USED FOR CUTTING PLASTIC, WOOD, SOFT OR BALSA PROP BLANK, NYLON THRUST METALS, LEXAN, PlEXIGLASS S ETC. #659). BEARING, BALL BEARING WASHER (3 0 ” & 4 0"), AVAILABLE IN .006, .008, .010, .012, .014. JAPANESE TISSUE, PLYWOOD, AND ALUM. With any model helicopter that uses a .016, .018, .020, .023. .025. MOTOR PEG. a o o 1 1 .0 0 p a h f o r e a c h k it o r o e r . c a . r e s . sliding wire for collective control, it always AOO a s TAX. .028, .032 THICKNESS: 3508 POINSETTIA AVE. 1' OUTSIDE DIAMETER @ $6.75 EA has a sliding ring at the bottom of the rotor MANHATTAN BEACH. CA. 90266 shaft. For example, Schluter Champion, NO. 502 · ARBOR · $6.00 Kyosho Concept, and Kalt Cyclone all have 1/5 Seal® Ktr^ NO. 503 · Γ X .014 X 1/4' SAW · $6.00 this sliding collar. Make sure this collar can (OUR SAWS ONLY WORK WITH OUR ARBOR) 111 inch wingspan slide up and down very freely. If not, try PIN VISES bending the 90° wire elbow at the collar A Complete Kit: Fiberglass Fuselage. Plans. SUPPUED WITH 2 REVERSIBLE COLLETS side very slightly. Try filing down the back­ 0 T 0 1/8' CAP. LARGE KNURLED HANDLE. Instruction Book. side of the wire slightly. You might also STAINLESS STEEL THROUGHOUT. HOLDS All hardware & TAPS UP TO 6-32. take a piece of emery cloth and sand down Wood Paris / the 10mm shaft at the sliding collar region. No. 504 - 4' —$4.00 i I SET OF / No 505 — 6 '- 11.00 II ALL 4 Finally, once the collar can slide freely, add f No. 506- 10*- 16.75 If $38 00 some grease. I spent an hour at making my ( No. 507- 15*- 19.00 J collective collar slide freely. The tail rotor control setup requires EASTERN TOOL&SUPPLY CO. some attention to make it smooth. After 149 GRAND ST. - N.Y.C., N.Y. 10013 the tail rotor gear box is assembled, you A vintage sailplane tor 3 ch RC WRITE FOR CATALOG $3.00 ORDERS: 212-925-1006 $230 plus $12 shipping and handling from WHEN ORDERING - PPD ADD $3.00 OFFICE: 212-226-3749 should operate the tail rotor pitch change COD ADD $5.00 FAX: 212-925-1010 mechanism by hand to ensure it is smooth. TRITON MODELS Surprisingly, the instructions did not sug­ P.O. Box 1157 gest lubricating anything in the kit. Maybe Kotzebue, Alaska 99752 lateral cyclic commands are given. This is the manual forgot? Well, use your com­ why most helicopters kits now use the in­ mon sense, and do use some grease or oil tions and set the rods exactly as shown. line swashplate design. at all the moving parts on the helicopter. The Kalt white ball links that came with the The molded side frames have a rectangu­ Most hobby shops carry model car or heli­ kit fit the balls quite well; not too tight, and lar cutout behind the engine for mounting copter lubricants. If the Cyclone tail rotor no slop either. If any of the ball links are an electronic gyro. At first, I mounted my unit is assembled carefully, then the pitch too tight, fit a Philips screwdriver through rate gyro there, too. But I discovered that it change mechanism can be very smooth. If the ball link’s hole and move it around to made the model tail-heavy. Therefore, we the pitch control mechanism sticks, then enlarge the hole very slightly. The anti­ advise you to mount your gyro in the front try bending the chrome plated control rotation bracket above the swashplate is a cabin. The ideal center-of-gravity for most wire at the 90° joint very slightly. Time beautifully made aluminum piece. The helicopter models should be about 1/8 spent here will reward you with a smooth swashplate is a also a nicely machined inch in front of the main shaft. If you pick heading control helicopter. Otherwise, metal piece. However, the swashplate de­ up the helicopter by the flybar, the nose of your gyro will have a difficult time feeding sign is not the modern inline swashplate the helicopter model should dip down fine inputs to the tail rotor. Thus, if you design as used on the Kalt Excalibur, and very slightly (the nose leans downward wonder why someone else’s helicopter on other brand kits. The problem of a non- about 1 to 2 degrees). flies so well, it's not necessarily the model inline swashplate as on the Cyclone is that brand, or design, it's the attention in setting it can cause a slight amount of longitudinal Editor's Note: Because o f the length o f up that counts significantly! and lateral cyclic control coupling. Fur­ this article, and not wishing to cut any The pushrod lengths given in the in­ thermore, it causes a slight amount of stress valued information to the reader, we are structions are perfect! Follow the instruc- and binding on the anti-rotation arm when concluding this review in the next issue.

MAY 1990 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 107 HOW TO GET H

You’re ready for the 4NBF has superior noise t h e S y s t e m s f o r and voltage regulation. takeoff with Futaba's new rejection to ward off in­ 1991 AND BEYOND. Conquest PCM system re­ Conquest Series. These are creasing interference, and, Conquest 4NBF ceivers are equipped with the systems that can take of course, it’s 1991 ready. 4NBR 6NFK and 6NPK Futaba's exclusive PCM you from fledgling flyer to The 4NBF also has servo systems all use state-of- microprocessor to further confident RC pilot, and reverse for easy installation, the-art, dual conversion reduce the possibility of make it easier than ever. adjustable control sticks 1991 receivers. The 4 and glitching and interference. for a custom fit and it's 6 channel FM CABLE READY. FM. equipped with transmitter A systems use AND MORE. and receiver NiCd packs. the R127DF The Conquest 4NBF And with its built-in which utilizes is a perfect first system with trainer system all you need SMT assem­ everything a beginner could is our optional trainer cord bly, ceramic ask for, and then some. For to make teaching or learn­ and crystal starters, the FM signal of ing a breeze. filtering

Release the trainer switch and control The heart of the new R124DP/R127DP of the airplane is instantly and salely PCM receivers is Futaba's custom m i­ transferred to the instructor. croprocessor circuitry.

The Conquest 4NBF

liOWE'A

DIGITAL PROPORTIONAL Γ RADIO CONTROL 9Y3TEM 5> a JOMQUEST FM

WORLD LEADING MANUFACTURER OF R/C MKEDONRC.

PCM CONQUEST SYSTEM The Conquest 4NBP is Take off with confi­ The Conquest 4NBP S p e c s identical to the 4NBF except dence. Futaba Conquest and 6NPK System Signal Receiver Servosf#) it’s Futaba’s first 4 channel systems offer the number 4NBF FM R127DF S148(3) PCM system and includes one combination of features, 4NBP PCM R124DP S148(3) our R124DP receiver. If it’s value and performance, 6NFK FM R127DF S148(4) more channels and features whether you’re a novice or 6NPK PCM R127DP S148(4) you need, consider the just looking for a high quality Conquest 6NFK or 6NPK. second system. And like all Futaba radios, Conquest sys­ PICK THE PERFECT These 6 channel FM and tems are covered by our full CONQUEST FOR YOU PCM versions incorporate year warranty. dual rates for aileron and There are four new elevator plus a retract Flrtaba Conquest systems to switch and a 3-position Futaba Corporation of America choose from. sixth channel. 4 Studebaker/ Irvine, CA 92718

20KH7 1991

The Conquest 6NFK

ELEVATOR AILERON D/R D/R

INTERNAL RADIO FREQUENCY MODULE SYSTEM

CONQUEST A New Dimension In .80 Size Power

Putting maximum size power in a min­ imum size package has become a spe­ cialty of Enya. And the 80XF 2-cyde takes this art form Enya’s 80XF to yet another level. With both its plane and chopper versions, the 80XF produces 1.6 to 2.0 hp at up to 16,000 RPM. But what’s unique is that it packs 80XF-H this power into a size that fits the mounting dimensions of our60XF-4. For Chopper Pilots. Think about it. If you're flying helicopters, you know that space is at a premium and power is often the key to perfor­ mance. Yet 'til now, if you needed more power in a .60 chopper, you didn’t have much choice. A 4-cycle wouldn’t work, and a .90 wouldn’t fit. Enter Enya’s 80XF-H. For take-off power, solid lift and stable flight, you can put this 19.7 oz powerhouse, with its special engine-cooling heat sink head, into your .60 size chopper, and effortlessly lift up to 15.2 lbs. of helicopter with ease. For Fixed-Wing Aircraft. Swinging props from 12x8 to 14x12, the 80XF’s extra torque lets you run bigger planes at lower RPM’s and still get the power you need. It’s not only nice to know you have this reservoir of extra power, but running at lower RPM’s will also add life to your engine. The engine is complete with a GM-I0S carburetor that’s adjustable in high-, mid- and low-end throttle speeds and is Schneurle-ported with side exhaust. Most important - it packs a major punch in a small package. yflLTKH MARKETING For maximum safety and enjoyment, read and follow manufacturer's instructions closely. ENYA MODEL ENGINES PO. Box 391, Edison, NJ. 08818-0391 12011248-8738