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JU LY 1989

ICD 08545 U.S.A. $2.95 Canada $3.95

volume 19, number 209 WORLD'S MOST COMPLETE MODEL PUBLICATION INSIDE: Plans for a

‘U’tM M & S a fiS F 00

0 74820 08545 ,n5 Play!

If you fly a .40 or .46-sized plane, you can enjoy the classic features of O .S. SF engines with the bonus of a factory pre-set pump system. With Schnuerle porting, a double ball-bearing supported crankshaft, single-piece crankcase, and expansion muffler, the new .46 S F ABC-P is as forceful as you'd expect any O.S. engine to be. Outfitted with the newly-designed 46 The .46 SF ABC-P’s new pump For larger models, the Pump System, it’s the power you've asked for, and more. and carburetor maximize fuel .61 RF ABC-P offers power The 46 Pump System yields optimum pressurized fuel efficiency. plus unequalled reliability. flow, resulting in greater consistency of operation and unequalled reliability, even during the most demanding maneuvers. The pump is preset at the factory and requires no adjust­ ment. Together with a specially- designed carburetor, the 46 Pump System makes the new .46 SF ABC-P the ideal match for your DBENGINES power-hungry plane. Whether you're flying a .40 or . 60-size model, O.S. has the answer for your power DISTRIBUTED TO LEADING RETAILERS needs. An O.S. SF engine is ready to push your expectations of performance to new N ATIO N W ID E E X C L U S IV E L Y T H R O U G H heights. For serious fliers, there’s no better way to be certain you'll get the most satisfaction from your model. The complete selection of high -quality O.S. engines is waiting for you at your SaGREATPlANfS local hobby dealer. Install an O.S. powerplant in your model today, and find out what you’ve been missing.

© 1989, Hobblco. Inc. Warranty coverage on all O. S. Engines is extended to a full two years! New ik “briefings” from H.A.

REVOLUTION IN THE SKY. Allen New. re­ JACK NORTHROP AND THE FLYING WING. U S. NAVY AIRCRAFT 1921-1941 vised edition Allen tells the exciting stories of Coleman The real story behind the Stealth U .S. MARINE CORPS AIRCRAFT 1914-1959. USWAUIM all the passenger planes built by Lockheed Bomber (The new B-2 Is based on technology Larkin Now back-in-print after 30 years. lo>K»*s during the Golden Age-Vega. Air Express. developed by Jack Northrop some 40 years Larkin's illustrated surveys of Navy and Ma­ l a i r c r a f t Sirius. Orion-and tne pioneers who Hew ago ) A story of intrigue, sabotage, collu­ rine corps aircraft remain two of the most I/.,// /T,'· them-Lindbergh. Wiley Post. Amelia Earhart. sion-written by one of Northrop s close asso­ valuable books ever published about these air­ Turner. Doolittle, and others Illustrated with ciates First hand account of the obstacles, planes More than 1.000 rare photographs 250 historic photos and scale drawings. 256 personalities, government interference the chronologically presents detailed descriptions pgs . 8 V r"x 11". hdbd A Reviewer's confrontation with Convair, and the grit of this of the aircraft of this period Both books now Choice' 3490C $24.95 most visionary of pioneers. 83 photos. 284 printed as a single volume 612 pgs . 6 " x 9 ". pgs 6Y."x9V.".hdbd 4450A$24.95 hdbd I491C $27.50 CIERVA AUTOGRIROS: The Development ol U .S . AIR FORCE AGGRESSOR SQUADRONS; C Rotary-Wing Flight. Brooks The story ol Juan THE B-1 BOMBER. Holder The updated story A M Vol. 11. Kinzev and Leader Aggressor de la Cierva who pioneered the development of of America' most controversial aircraft to date pilots-based at Nellis AFB. Nevada. Clark the Autogiro Examines each successive tech­ History, design details, technological break­ AFB. Philippines; and Alconbury. England- nical step culminating in the development ol throughs. political upheaval, weapons, ter­ fly Soviet tactics against other Air Force pilots the jump take-off' Comprehensive collec­ rain-following flight profile and all aspects of to provide realistic air combat training Air­ tion of photos. 56 3-view drawings, appen­ its flight testing, production, deployment, craft including T-38s and F-5s. are painted in dixes. 416 pgs . 6 Ά " x 9 % ", hdbd plus a look into tne future 125 excellent pho­ schemes used by Soviet Union and Warsaw 4354C $35.00 tos. 11 in color. 102 pgs . 7V?" x 9 V T Sfbd Pack More than 50 full color and 100 black 1035A $10.95 WAL00: Pioneer Aviator. Waterman The true- and white photos, plus official AF drawings to-life story of Waldo Waterman. Barnstormer, LOCKHEEO U2R/TR-1: Minigraph 28. Miller & depicting camouflage patterns 64 pgs . 8V»" inventor, test pilot His life as an early TWA Pecock Detailed account of this second gen­ x 11". Slbd 1154A $11.95 pilot. Hollywood flying in the epic of Hell's eration U-2 family Covers all facets, including Angels" film, winning at the National Air flight test, development, and operational ser­ MC00NNELL DOUGLAS AIRCRAFT SINCE 1920. Francillon Discusses the great aircraft Races and of his perfection of the only suc­ vice and NASA usage Forty pages of facts, from the two manufacturers, such as the cessful flying automobile Captures the flavor, figures, line drawings, over 200 photos. 8 World Cruisers, the DC-1. 2 and 3 series, the excitement, glory and heartbreak of American page gatefold. 4 pages color 8 W " x 11 W *. wartime ships such as the Devastator, the aviation 1910-1944 300 photos. 502 pgs . Sfbd 3264A $9.95 I hlHTI VM l· 6 " x 9 ". sfbd 1440B $18.95 SBD. and the post-war series of DC aircraft, including the Skyhawk and Skyray Each type · IX .mXSjtmiun described in minute detail with three-view BEECHCRAFT: STAGGERWIN6 TO STARSHIP drawing 480 photos 640 pgs . 5W " x 8 % " Ed Phillips. Staggerwing. Twin Beech Bonan­ hdbd . . . 3384C $39.95 za every production and experimental M fcechcraft Beech airplane ever flown is documented THE MARTIN B-26 MARAUDER. Havener A St W% a«T«C TO SI ARSIIIF Complete warbird coverage of UC-43. GB-1. controversial aircraft, difficult to fly. with no v c jt AT-7. A M I . C-45. the mighty XA-38 Grizzly. safety margin, but rugged and heavily armed Postwar years including Model 35 Bonanza. Covers the design, testing, its near-cancel­ Travel Air. military and export models. T-34 lation by critics and its outstanding combat Mentors. Barons. Dukes and the legendary history The author flew more than 50 mis­ King Airs; they're all here plus much, much sions in the "widow-maker.' details aerial | more 245 photos. 343-view drawings, tech­ battles, accompanied by 150 outstanding Bell AH-1 Cobra nical specifications 96 pages. 8V*'' x 11". never-belore-published photos 264 pgs., 6" Variants slbd. 2012A $14.95 x 9 " Sfbd 1079A $16.95

THE PIPER CLASSICS. Christy The fun BELL AH-1 COBRA VARIANTS. Peoples. Com­ I "C u b s"—simple tube and fabric aircraft Dis­ pletely describes all variants from mock-up PIPER cusses the evolution of Piper lightplanes-J-3 studies to the latest AH-1 Ws Historical cover­ CLASSICS Cub. J-4 Coupes. J-5 Cruiser. PA-11. PA-18. TOP OUN, THE STORY BEHIND THE STORY. Watch Ameri- age. flight test programs and operational as­ Vagabonds. Colts. Pacer/Tri-Pacer. even Waa- ca's real Top Gun pilots in action over Libya, the Indian Ocean pects is detailed 250 photos, most never-be­ Aero s CUBy Also covers; problems. SPECS, and off the Soviet U nion.. .in actual dogfights, crashes and fore-published. 35.000 words of text, rebuilding, maintaining and operating 101 II- MIG confrontations. Listen in on actual air-to-air radio conver­ side-view line drawings, camofiage schemes, lus 160 pq s. 5" x 8 ". sfbd 4208B $13.95 sation and feel what it's like to fly twice the speed of sound. 35 and a modeler's haven of intimate detail 64 m in u te s ...... V 8761 $ 1 4 . · β pgs.. 8 V *xir. sfbd 3261C $12.95 CESSNA 150 and 172. Clarke A buyers guide 1141A $11.95 STRIKING BACK. A video of the fam ous Ida Grove radio-con­ THE C-130 HERCULES. McGowan Tactical CESSNA 172, Clarke A buyers guide trolled model airshow. The show is a very real and intense re­ airlift missions 1956-1975 The C-130 is rec­ 1140A $12.95 creation of South Pacific war action portraying the human ognized as the outstanding airliner of all time struggle to evict Japanese from the islands. Using 1/Sth scale The author, a C-130 veteran, describes the THE PIPER INDIANS. Clarke A model-by- aircraft, ships and tanks, the spectacular event includes air important Vietnam missions the resupply model inspection of the series the original PA- battles, sinking ships, paratroops and mucho m achinegun fire, of Khe Sanh. evacuation of Kham Due. C-130 28 Cherokees - the improved Indians; War­ exploding flak and giant pyrotechnics. 30 minutes bombers, flare missions and other special riors. Archer. Dakota - tne retractables. PA-24 ...... V 8 7 6 4 S 1 4 .e e missions A must for Herky buffs 116 photos. Comanches. PA-28R Arrows - the hard work­ 288 DOS . 6 " x 9 " 4298A $15.95 ing sixes; and the Tomahawks. Apaches Cov­ GIANTS OF LOCKHEED. Nearly a half hour of exquisite HORNET. Drendel The story of the Navy and ers where to find, maintenance, specs, refur­ ground and aerial views of the incredible SR-71 Blackbird. Marine Corps' newest Fighter/Attack aircraft bishing. and all of those ADs and STCs and Scene after scene shows off this triple sonic, turbo-ramjet from design, development and service With modifications. 112 photos. 288 pgs. 7" powered aircraft, built two decades ago. The next segment 130 B&E photos. 18 paintings, two 11x16 10" slbd 4213B $16.95 portrays the C-130 in all its glory. Then witness the awesome double page pull-outs of 1/72 scale drawings, abilities of the C-141 Starlifter and the mighty C-5 Galaxy as and his own experiences in the F/A-18. Dren­ WINGS OF CESSNA; MOOEL 120 TO THE Cl- they power their way across continents with m assive loads. All del has packed 64 with the Hornet mystique *e TATION III. Ed Phillips The complete family of c o lo r. 70 m in u te s. V H S ...... V 8 7 6 6 E S 3 2 .B 5 Cessna airplanes from the rag-wing 120 to the 4 1 10A $6.95 high-tech Citation III. Experimental ships, FALCON DOMAIN. The F-16 FIGHTING FALCON, the Air one-of-a-kind, the CH-1 helicopter and mili­ Forces' new air defense fighter and the Navy’s new “TOP F-8 CRUSADER. O&S *31. Kmzey Vought's tary models, every one documented with tech­ GUN” aggressor aircraft are featured in this indepth 90 minute F-8 was flown by the U S Navy and Marines nical changes by model year, specs., perform­ feature. You're in the cockpit during breathtaking low level at­ throughout the Vietnam war Covers all fighter ance. total built and serial number data 229 tacks and 9-G dogfighting. You'll Tly with the world famous and reconnaissance versions Lots of never- photos of airplanes and instrument panels "Thunderbirds” as they do their performance to m usic. (Color before-published photos of cockpit, camera plus more than 50 detailed 3-view drawings H I-F I, 9 0 m in u te )...... V 8 7 2 8 D $ 5 Q .9 5 bays, landing gear, engines, armament, and make this a valuable reference for the buff and variable-incidence wing Modelers section gives kit reviews, decals etc 223 photos, modeler 100 pqs . sfbd 2011A $12.95 T H E AIRSHOW . The most spectacular performances of the US many in color, plus 3-view drawings. 72 p g s.. Blue Angels. Italian Freece Tricolorl, Canadian Snowbirds plus CURTISS 1907-1947. Bowers Complete his­ 8Y* x 1 1 ". sfbd 1157A $9.95 tory of Glenn Curtiss and his companies the Brazilian and French national aerobatic teams as the per­ form at the Canadian Abbottsford International Airshow. Take Model by model coverage with clear crisp fac­ NEW! Detail & Scale Series your seat In the cockpit of the world s fastest and sexiest air­ tory photos, historical detail and full specs craft as they swoop and soar wingtip to wingtip. W itness exhi­ Vol 32-A-4 SKYHAWK (U S Navy and Marine Covers early experiments by Glenn Curtiss Versions) 1158AS9.95 bitions of the Harrier. Tomcat. Hornet. Concorde and SR-71 and exhibition tours. From early flying boats. Vol. 30-F4F WILOCAT (All F4F. FM-1 & FM-2 B la c k b ird . 6 0 m in . A R E V IE W E R S C H O IC E . June Bug. NC-4. Jenny. Hawk fighters and Versions) 1156A $9.95 V H S V8979N only $19.95 racers. Robin. Condor to the P-40’s. C-46 and VoI.4-F-111 AAROVARK (Revised 2nd edition) H \l F A WING je ta /c. Hundreds of photos. 637 pgs . 5 V r"x ...... 1044A $9.95 HREE ENGINES 8W ". hdbd 3383C $34.95 Pilot Manuals HALF A WING. TH REE ENGINES AND A P-38 1401B $6.95 B-26 . 1411B $12.95 T-28 TROJAN IN ACTION. Adcock T-28 was the lirst post-war trainer and served both PRAYER; B-17s Over Germany. O’Neil Five P-39 1402B $6.95 F-4U 1412B $7.95 T-28 TROJA YND A MtAYER USAF and USN in training roles Covers de­ members of one B-17 crew look back on their P-40 1403B S6.95 F-6F 1413B $7.95 m e r ( η μ ί ιμ ιο sign and development of T-28A. B. C and D. IM7s entire twenty-five missions over Germany dur­ P-47 1404B $6.95 FM-2 1414B S10.95 Over 110 photos. 70 detail drawings. 13 full- ing the crisis period of 1943-44 The crew $9.95 AT-6 14158 $7.95 color paintings. 50 pgs 11" x 8 W ". sfbd holds nothing back, as they relate how they P-61 1405B $7.95 Spitfire 1416B $3.95 4117A $6.95 saw and reacted to the same terrible even ts- P-63 1406B $7.95 Hurricane 1417B $3.95 and how they survived, and an overview of the P-82 1407B $7.95 Mosquito 14188 $3.95 NEW! In Action S e rie s- daylight bombing cam paign-is a story which B-17 1408B $8.95 Me262 1419B $7.95 SUKHOI FITTER IN ACTION 4118A 56.95 deserves to...... be retold.70 photos. 224 pgs.. B-24 1409B $10.95 F-80 1420B $7.95 CH-47 CHINOOK (April Release) 6 " x 9 ". slbd 1084A $14.95 B-25 141OB $10.95 B-29 14368 $10.95 4119AS6.95

14 DAY MONEY BACK GUARANTEE

I Total ^ Send Items: I|$ ------for items e Call us Toll Free Please Aviation P r in t 800-225-5575 Name___ 3850 H CORONATION RD.. EAGAN. MN 55122 MN, AK. and foreign countries use 1 -612-454- ■tq Address. 2493 (not toll (ree). Charge VISA or Master- Charge: □ VISA □ MasterCard Card. MN residents add 6% sales tax. Acct. No------City_____ Dealers invited. Authors manuscripts invited. Exp. Date------State___ ZiP- Country. MODEL & JULY 1989

BUILDER volume 19, number 209 898 West Sixteenth St., Newport Beach, California 92663 Phone (714) 645-8830

STAFF EDITOR/PUBLISHER CONTENTS Wm. C. Northrop, Jr. GENERAL MANAGER FEATURES Anita Northrop OVER THE COUNTER ...... 6 ASSISTANT GENERAL MANAGER Dawn Johnson WORKBENCH, Bill Northrop ...... 10 MANAGING EDITOR DEAR JAKE ...... 11 Richard Dowdy PRODUCTION ARTIST NUREMBERG FAIR 1989: THE ELECTRIC WAVE, Guy R e ve l...... 12 Kimber Jett-Baird CHOPPER CHATTER, lames Wang ...... 21 DRAWINGS BY Al Novotnik REVIEW: GMP’S “ LEGEND” HELICOPTER AND AIRTRONICS’ ACCOUNTING MANAGER QUANTUM 8H PCM HELI RADIO, lames W ang...... 22 Robert Ruiz SUBSCRIPTION MANAGER BIG BIRDS, Al A lm a n ...... 24 Audrey Peterson ELECTRONICS CORNER, Floy Marez ...... 26 OFFICE STAFF A. Valcarsel PATTERN FLYING, Dick Hanson...... 27 CONTRIBUTING EDITORS R/C SOARING, Bill Forrey ...... 28 Al Alman Mitch Poling Jake Doe John Pond MODEL DESIGN AND TECHNICAL STUFF, Francis Reynolds...... 31 Bill Forrey Fernando Ramos PLUG SPARKS, John Po nd...... 32 Steve Cray Francis Reynolds Bill Hannan Stu Richmond INSIDE ENGINES, Stu Richmond...... 38 Dick Hanson Bob Stalick Dave Linstrum Art Steinberg ELECTRIC POWER, Mitch Poling...... 40 Fred Lehmberg John Thompson Eloy Marez James Wang ALL ABOUT ARFs, Dr. Art Steinberg...... 42 Walt Mooney Bill Warner HANNAN'S HANGAR, Bill Hannan ...... 44 ADVERTISING Gordon Boudewyn CONTROL LINE, )ohn Thompson...... 50 Advertising Accounts Manager FREE FLIGHT, B o b Sta iick...... 56 Corporate Office (619) 744-7337 INSIDERS, Dave Linstrum ...... 60 Al Novotnik 4 Beverly PL, Norwalk, CT 06850 Fernando Ramos FREE FLIGHT SCALE, ...... 62 Bus. Phone (203) 847-7478 MODEL BUILDER (ISSN 0194 7079) is published CONSTRUCTION monthly by RCMB INC., 898 West 16th St., New­ port Beach, California 92663. Phone (714) TIGERCAT Mk. II, Bob Benjamin...... 16 645-8830. Subscriptions: $25.00 per year, $47.00 for two TRENTON TERROR O.T., Mickey DeAngelis ...... 36 years. Single copies $2.95. Subscriptions outside the US (except APO & FPO) $38.00 for one year STINSON MODEL “ U", Mike Kevilie...... 46 only. All payments must be in US funds, drawn on a US bank. PUSSYCAT, Dick Baxter...... 52 Copyright 1989 by RCMB INC. All rights reserved. Reproduction without permission pro­ hibited. Change of address notices must be received six weeks before date of issue that new address takes COVER: This North American SNJ-5, piloted by John Collver and his wife Donna, is effect. Send old address with new. . .old label being sponsored by Model Builder magazine during the 1989 show season. It can be preferred. Duplicate issues cannot be sent. Post­ seen at static and aerobatic flying shows throughout Southern California, The SN J is in master send address changes to Model Builder, El Toro Training Command VMT-2 markings and is based at Compton Airport. John. 898 W. 16th St., Newport Beach, California 34. soloed on his 16th birthday, and earned his instructors rating before graduating 92663. from high school. Second class postage paid at Newport Beach, California, and additional offices.

2 MODEL BUILDER I I I I 1 1 1

The new Export' FM seven ithannel radio system is The transmitter is a lightweight, easy to hold design NEW! TWO WAY backed up with twenty-nine years of engineering, Both non-slip control sticks are equipped wd designing, manufacturing, and experience adiustable spring tension and stick length Controls li LOW ROLL SWITCH World Engines technicians and staff have also aileron and rudder dual rates, retracts (ch.5), flaps wii I either left or right with a accumulated over 129 years of experience flying separately adjustable elevator trim (ch.7). auxiliary iple flip of the switch Roll- competition pattern, scale sailplanes, pylon and lch.6). Two-way Slow Rolling, and coupled rudder in ; adjustable. everyday sport flying. mixing, are positioned at your fingertips. Other This experience that combines the workbench end adjustments which are not needed while flying, such flight line helped us to realize that testing and servo reversing, roll rate adjustment, and all mixing ftIEW! V-TAIL MIX accountability does not end with the test stend. Testing adjustments are securely located under the rear panel Allows the rudder and at World Engines starts with the lab and moves to the on the back of the transmitter. V flying held - the ultimate test The concept of testing An extremely narrow crystal filter is used in our new continuity is called the R W.E.T.F.- check. Real World receiver to virtually eliminate outside interference. Its elevator servos to ac t as two Environment Test small size and light weight allow it to be used in almost separate servos or as two 20KHz-TX/10KHz RX Flying. any application. The new Expert" FM receiver has servos in parallel. Perfect for gliders, demonstrated its ability to fly at locations that other pylon, and models using a V-Tail. brands are not considered flyable Finally, the new Expert" FM system has one feature ------NEW! DELTA MIX that is herd to match, the backing of a dependable Allows the aileron and service department located here in the central United elevator servos to a c t as ______States. Make the Expert’ FM seven channel ------two separate servos or as system your system for 1989 Why pay two servos in parallel. Use instead of a for features that you will never use m echanical elevon mixer. | and may even become ■serious service problems SERVO REVERSING down the The throws for all seven road channels can be individually reversed by simply throwing one of seven switches located on the rear of the transmitter.

COUPLED RUDDER MIX Aileron and rudder mixing allow for coordinated turns in quarter scale and larger models. This mixing feature works from the rudder and the aileron sticks simultaneously.

1991 REA D Y This system exceeds the 1991 1991 standards set by the AMA. Our transmitter proudly wears the AMA Gold Sticker.

The Expert FM seven channel system comes complete with the new ENGINEERED FOR THE full featured transmitter, our exclusive crystal filter receiver, four weather- resistant S-25 servos with mounting SERIOUS MODELER hardware, rechargeable batteries in both the transmitter and receiver packs, switch WORLD ENGINES INC. harness, charger, 8960 Rossash Road. Cincinnati. Oh. 45236 transmitter neck strap, Phone: (513) 793-5900 · Telex: 214 557 and frequency flag. These products are available exclusively through World Engines dealers nationwide. © 1989 World Engines Inc · Expert- is a registered trademark of World Engines Inc Tl*»! g f C C f R A C f 3 5 C/L STUNT AND SPORT MODEL

Designed by 7Ki6e “P ia tt

SPECIFICATIONS: KIT CL-25 Engines: .19 - .35 cu. in. Wing Span: 44 in. Wing Area: 396 sq. in. KIT FEATURES: Fuselage Length: 33 in. An Easy-To-Build All-Wood Design Top Quality Sig Balsa And Plywood 1/2” Balsa Profile Fuselage Die-Cut Sheet Balsa Tail Surfaces Die-Cut Plywood Doublers And Wing Ribs Strong Spruce Spars Pre-Bent Pushrod And Landing Gear “ Easy Hinges" Colorful Decal Markings Highly Detailed Full-Size Plans Complete Hardware Package (no running back and forth to the hobby shop) $34.95 HARDWARE PACKAGE INCLUDES: Sig 3” Nylon Bellcrank Lead Out Cable The SKYRAY 35 is an easy-to-build .19 - .35 size profile model that is suitable for a wide variety of control­ Wing Tip Weight line flying fun. This excellent all purpose design is suitable for stunt, combat, racing, or general sport flying. Molded Nylon L.G. Straps When equipped with a .19 engine, it makes a great control-line trainer. Bolt on a Fox .35 Stunt engine, and Molded Nylon Control Horn the SKYRAY 35 will fly the complete AMA stunt pattern. Install a high-performance combat engine, and Engine Mounting Bolts you’ll have a real HOT ROD on your handsl Dyed-in-the-wool “ roundy-rounders” will really appreciate the J-Bolts, Screws, Washers, SKYRAY’S rugged construction and super tough wing design, which features spruce spars and die-cut Lite-Ply And Other Small Hardware wing ribs. All prices subject to change without notice. A WELCOME ADDITION TO SIG’S CURRENT CONTROL-LINE WINNERS

MUSTANG STUNTER MAGNUM SUPER CHIPMUNK

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 SIG MANUFACTURING CO., INC...... Montezuma, IA 50171 Dreamgirl.

With her stunning looks and builder, don't let her graceful lines and starts and lift-grabbing tight turns, she sparkling performance, who could state-of-the-art T-tail scare you. won't be insulted if you prefer the blame you for guessing that the building the Lady is a piece of cake. more relaxed fun of powered climbs Sophisticated Lady might be a bit of with the C.G. Electric Power Pod. a snob? THE LADY Whatever your pleasure, the Fact is. she isn't. LOVES A CHALLENGE Sophisticated Lady is great company. She’s a high-flying beauty with a personality that couldn’t be more Even if you SHH’S GOT ΛΙ .1. Π IE ESSENTHALS down-to-earth. put her up in AND SOME EXTRAS, TOO. weak air, her SOPHISTICATION. extraordinary As you might expect, the Lady’s NOT COMPLICA TION L/D will ^ ^ kit is complete in every detail.The wood is select, the cutting is precise, ^ ^ AH the with impressive the hardware is like fine jewelry, and (f f tricks are in the durations. there are nice touches—like her In m orn V/»<■ < '■ l/n :nt / ton ( engineering—not III IIIOIC ,,ys, ·, rfe c t formed canopy and cockpit detail - active condi- . ,· m iy , just to sweeten the deal. \ - / in the skills you’ll tions. add a bit And speaking of the deal, you need to build her. The of ballast and don’t have to be a big spender to take ' Lady’s designed to go the Lady’s slim airfoil and slender her out, either. together straight and true, with the contours let her knife through So don’t keep the Lady waiting. help of plans and instructions that turbulence and handle booming lift She’s at your local dealer’s now, and may be the most complete you've ever with ease. we hear she’s ———— seen. There's even a section on tech­ And while she’s built to shrug off just dying to CAm o DGe° l Ls D, n c RG niques for the various forms of soaring. the rigors of standard 2-meter high- meet you. m o d £U & iim c. So if you aren't an experienced

The Sophisticated Lady. “ A 2-meter thriller from Carl Goldberg Models OVER THE COUNTER All material published in " Over the Counter" ψ is quoted or paraphrased from press releases, W furnished by the manufacturers and/or their advertising agencies, unless otherwise speci­ fied. The review and/or description of 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. •

• First bit of news this month is that Great available with Futaba G, j, and Airtronics Sailplanes designed for the novice R/C Planes Model Distributors is now offering connectors. pilot are usually two-meter span or smaller, Kyosho’s Auto Cut-Off as a separate item From Great Planes Model Distributors, but the new “ Flabicht” (German for Hawk) for individual electric power installations. P.O. Box 4021, Champaign, Illinois 61820. from Robbe is an easy flying 110-inch glider This device, which is included with Kyo­ that features a molded plastic fuselage and sho’s ARF electrics, is a radio operated Jedelsky type prefabricated wing panels. electronic on-off motor switch that runs the radio off of the on-board motor bat­ teries (six or seven cells). The advantage, of course, is that no motor control servo and no separate radio battery are required, making for a much lighter and more com­ pact installation. As the name implies, the Auto Cut-Off is designed to automatically shut the motor off when the battery voltage drops to a predetermined level, saving enough juice to run the radio long enough to get back down safely. Other safety fea­ tures include a 30-amp inline fuse and a pushbutton arming switch to guard against premature motor start-up when the radio is first turned on. The unit plugs into the throttle channel on the receiver and is Dieter Schluter’s “Magic" helicopter, from Robbe Model Sport. Rafect Stability Airtronics SG-1 Precision Ball Bearing Gyroscope a gyro output reverse switch and a neutral adjust System is a compact helicopter single axis gyro that trimmer for precise rudder servo neutral adjustment. incorporates advanced technological features for out­ standing flight performance ana 96251 SG-1 Gyro Specifications: maneuverability. Power Supply: 4 Cell 4.8 Volt (common power) 5 Cell 6 Volt (separate power) Designed for easy instal­ lation, setup and adjustment, the Motor Running Current: 130 MA D C. SG-1 provides superior stability Amplifier Current: 30 MA D.C. and control in the most demand­ Dimensions: Gyroscope— 1.69" x 1.48" x 1.69" Mixer A m p -2 .4 4 "x 1.36" x 0.75" ing flying conditions. C ontrol B o x -0 .9 5 " x 1.34" x 0.75"

m is economically-priced Weight: Gyroscope—2.54 oz. gyro features a ball-beanng Mixer Amp— 1.09 oz. equipped gimbal, a regulated Control Box—0.06 oz. gyro motor voltage supply, an Detection Method: Hall Effect Sensor easy mounting connector system and a convenient gyro setup for [ r e v — n o h )[ n l r ] S E N S O R The SG-1 Gyro offers you in-flight on/off operation or dual a perfect blend of stability, per­ AIRTRONICS S W U N IT sensitivity. ^ formance and compatibility with The precision SG-1 gyro GYRO MIXER BATT all Airtronics R/C systems. automatically senses movement 96252 S X R U O and directs tne proper command R X A U X We Set The Standard. R X R U O < T N to the appropriate servo. RY BAM M lN ADJl The mixer amplifier utilizes ^AIRTRONICS INC an automatic power source selector, 11 Autry, ΛιιΗ -w Irxnru»Irvine, CAC Δ Q92718 9 7 1 R Γ7ΛΔ\(714) 830-8769

For more information about Airtronics' quality products please call or write to the address above. The “Habicht" (Hawk) from Robbe Model Sport, this is really the case. In the meantime, if see fit. Retail price is $59.95. 110-inch R/C glider for novices. you have any questions about the Magic From Prather Products, 1660 Ravenna Said to be extremely docile and requiring or any of Robbe’s other products, you can Ave., Wilmington, California 90744. only a two-channel R/C system, the model get answers by calling them direct at (201) can be flown as a pure sailplane (hi-startor 359-0157. slope) or as a motorglider using Robbe's From Robbe Model Sport,180Township The “ Skyray 35” is Sig’s latest kit offering, optional power pod for .09 size engines. Line Road, Belle Mead, New Jersey 08502. this one being a general purpose C/L sport The kit includes sanded tail surfaces, hard­ * * * model for .19 to .35 size engines. The air­ ware, decals, plans, and instructions. Terry Prather advises us that his com­ plane was designed by Mike Pratt, who is Also new from Robbe is the “ Magic” pany's prop pitch gauge, which has been responsible for several of Sig’s C/L kits, and R/C helicopter, the latest from Dieter out of production for several years, is now is based largely on the layout of the all-balsa Schluter of Germany. Our “ Chopper back by popular demand. This is an essen­ 1/2A Skyray C/L model also kitted by Sig. Chatter" columnist, James Wang, is plan­ tial tool for anyone who demands the ut­ The Skyray 35 has been scaled up to 44-inch ning to do a complete review of the Magic most performance out of his models. Pylon span and features the usual high-quality in the near future, so we’ll hold off men­ racers have long known the necessity of materials found in all of Sig’s kits, plus a full tioning any details except to say that it's a checking and truing their props for maxi­ hardware package. Asking price is $34.95. .60 size machine that just may be the hottest mum performance. The Prather Pitch From Sig Mfg. Co., 401-7 South Front St., competition helicopter developed so far. Gauge allows you to easily check or even Montezuma, Iowa 50171. We'll have to wait for the review to see if change the pitch of your propellers as you * * * Highspeed. Airtronics' MA-3 electronic speed controller is 96330 MA-3 Specifications: specially designed for electric powered aircraft. Solid Power Supply: 4 Cell 4.8 to 7 Cell 8.4 Volt NiCd pack Voltage Loss: 0.006 Volts/Amp

state componentry design ensures you instant throttle FET Current Ratings: Continuous Maximum Current— 148 Amps control response and improved R1C flight Instantaneous Maximum Current—580 Amps performance. Dimensions: 1.42” x 1.16" x 0.67” An efficient Proportional Electronic Weight: 0.63 oz. (less switch and connectors) Throttle Control enhances the MA-3's Continuous Current Rating: 23 Amps w ith cooling supercompact size and weight by Intended Use: Electnc Powered Aircraft eliminating an additional battery servo Adjustment Type: Off-Position Trimmer and switch. Because it operates sep­ Motor Size: 280 to 540 Class Femte Motors arately from the receiver, the MA-3 has greater flexibility than integrated-type units Compatible only with Airtronics AM and and can be used with a variety of aircraft. FM systems* the MA-3 speed controller accom­ The MA-3 features Power M O S ______modates 280 to 540 size ferrite electric motors FET Amplifier Transistors for low voltage utilizing 4 -7 cell battery packs. loss and a convenient Battery Vbltage Regulator. An Get nigh speed flight performance with Automatic Cut Off system reduces voltage to the elec­ Airtronics' MA-3 tric motor whenever the NiCd voltage decreases to We SetThe Standard. electronic preset levels An advanced Heat Protected Amplifier speed controller. interrupts current flow to the motor to protect circuit ^AIRTRONICS INC components from overheating. ^ / 11 Autry,Atifrv Irvine,I CA ΓΔ 92718Q771« (714)IT\A\ 830-8769

For more information about Airtronics' quality products please call or write to the address above. *Not compatible with PCM Receivers. Three Radio Control Handbooks by Argus, from Zenith Aviation Books. If you’re one of those modelers who rightfully believe you can never have too many tools, you’ll want to add Design En­ terprise’s "Miter Magic" to your shop. This is a small mitering tool used with your razor saw, for cutting strips and sticks at precise angles in 150 increments from 45° to 90°. it works both right and left handed; the saw remains constant in relation to the base of the tool and the material is moved through the desired angles. As a final touch, the bottom of the base is covered with an abrasive paper to keep the thing in one place while being used. Certainly seems worth the asking price of $2.98! From Design Enterprise, Rt. 5, Box 10, New Richmond, Wisconsin 54017. ♦ * * We received copies of the first three of a new series of modeling books published in A 3-in-1 Piper Cub plan (shows clipped wing and Super Cub) in 30% scale by Hostetler. England by Argus Books and distributed in From Zenith Aviation Books, P.O. Box 2, complete vibration dampening. Snuf-Vibe the U.S. by Zenith Aviation Books. The 729 Prospect Ave., Osceola, Wisconsin mounting kits consist of four bolts and all titles are Building From Plans, by David 54020. the necessary neoprene grommets and Boddington; Installing Radio Control * * * bushings to adapt any brand of aluminum Equipment, by Peter Smoothy; and Setting or glass-filled nylon mounts to the vibra­ Up Radio Control Helicopters, by Dave A number of vibration isolated engine tion isolated type. Snuf-Vibe mounts in­ Day. We haven’t had a chance to do more mounts are now available to modelers and clude all of this hardware plus a cast than give each one a brief look, but can tell the newest ones to appear are the "Snuf- aluminum J’Tec engine mount, which can you that they are all very professionally Vibe” mounts and mounting kits just be supplied either drilled for a large variety done and appear to be quite comprehen­ announced by J’Tec. The Snuf-Vibesystem of two and four-cycle engines, or undrilled. sive. Each is in a 7-1/4x10 format, with 64 completely encloses the engine mounting For an info sheet listing all of the drilled pages and 80 illustrations apiece. Going bolts with neoprene rubber, both in the Snuf-Vibe engine mounts available, send price is $9.95 each. engine mount itself and in the firewall, for an SASE to J’Tec, 164 School St., Daly City,

The "Miter Magic" by Design Enterprise. “Snuf-Vibe” engine mounts by J ’Tec.

8 MODELBUILDER without the optional scissor linkage. Con­ struction is of aluminum with stainless steel Wendell Hostetler is celebrating his strut pins. These are not exactly inexpen­ tenth anniversary in the Giant Scale plans sive items—prices for a pair of mains range business by announcing a 3-in-1 Piper Cub from $29.95 to $89.95—but for those who plan, which includes the standard J-3 Cub, want the very best, this is the way to go. clipped-wing Cub and Super Cub. The The same can be said for Impact Engi­ plans are drawn at 30% scale, which makes neering’s pneumatic retract systems. These for a span of 127 inches (102 inches for the are available in three different sizes and clipped-wing), a wing area of 2280 square have such features as pneumatic drive both inches (1824 for the clipped-wing), a length up and down, positive mechanical lock in of 76 inches and a flying weight of 22 to 25 the up position to keep the gear from sag­ pounds. ging during high-G maneuvers,and a safety Accessories available include three dif­ spring system that automatically locks the ferent cowls, a heat treated shock absorb­ gear in the down position if air pressure is ing landing gear, vinyl decals, and plans for lost. System prices start at $139.95 and are a set of 60-inch Edo type floats. Futaba’s 5UA system AM sport radio. complete with retracts, rotary spool valve, The Piper Cub plans are drawn on two California 94014. fill valve, tank, hoses, and all necessary 42x96-inch sheets and are priced at $29.50 * * * fittings. postpaid (U.P.S.). Float plans are $15.95. If interested, your best bet would be to For more information on the accessories Futaba’s new 5UA system is an inexpen­ send a large SASE and ask for their in­ listed above as well as the other plans in sively priced five-channel AM sport radio formation and pricing brochure. Write to the lineup, send an SASE to Wendell Hos­ with such features as a plug-in transmitter Impact Engineering, 2100 Stonehill Court, tetler’s Plans, 1041 Heatherwood Lane, RF module, ATV on four channels, dual Arlington, Texas 76012. Orrville, Ohio 44667. · rates on two, and servo reversing on all five. The system is supplied with Futaba’s R117H AM receiver (meets 1991 specs) and four S148 servos. The new 5UA system should be available at your local hobby shop by the time you read this. From Futaba Corp. of America, 4 Stu- debaker, Irvine, California 92718. * * * Those beautifully made functioning landing gear shock struts from Impact En­ gineering are now also being made avail­ able in kit form, saving the buyer up to twelve bucks over the factory assembled prices. Four different styles are offered, each in three different sizes, both with and Impact Engineering's pneumatic retract systems.

Functioning landing gear shock struts from Impact Engineering. The Prather prop pitch gauge is back.

JULY 1989 9 • f r o n r »

B H i

N o r t h r o p ' * Plane on the cover, with Its co-owners; (I to r) Donna and John Collver (pilot), and Ron and Joannie Custer (Donna's parents). The SNJ-5, built In November 1944, is powered by a 600 hp Pratt & Whitney engine displacing 1340 cu. in. It is based at Warbirds West, Compton Airport, in Southern w o r k b e n c h California. See cover story on page 2 for more information. Toledo Weak Signals R/C Club, is now plus throttle, of course. The catch was that, history. Incidentally, it was the twenty- until later years, this category, like Rudder BEST LAID PLANS seventh consecutive Toledo show for this Only, was limited to the use of a single We were real proud of that interesting writer, who drove out from Delaware with channel radio. Asa result, there were some photo on last month’s cover, and made fellow club member Graham Lomax real Rube Goldberg devices . . . and some special effort to assemble all the proper through rain, sleet, and snow to attend the real clever ones. . . that gave rudder, ele­ information for the "Cover Story" that al­ 1962 gathering at a golf course country vator, and throttle off a single radio chan­ ways appears below the Contents, on page club, under 15 inches of white stuff on the nel. I had designed, built, and test flown a 2. We called Mike Cioli, president of Circus ground, somewhere south of town. I en­ streamlined version of my “ Square Hare," Hobbies, in Champaign, Illinois, to confirm tered the static model competition with an which was dubbed the “ Smooth Hare.” It the identity of the two model helicopters aerobatic model that took first place in the was equipped with a single-channel Kraft and their pilots. We also called Mel Larson, Intermediate category. For the information receiver, and the rudder and elevator were Executive V.P. of Circus Circus Enterprises, of newer R/Cers, the Pattern event back in controlled by “ Galloping Ghost," a system to get all the specifics on his Bell Long those days was divided into equipment in which one electric motor in the plane Ranger. We then fed this information into categories, not skill levels. Rudder Only was pulsed back and forth, causing the the cover story that had already been out­ was exactly what it implies; control of the rudder and elevator to simultaneously lined, and then took off for Atlanta to settle aircraft by the rudder . . . no elevator or pulse from side-to-side and up-and-down some details for the upcoming IMS show ailerons. . . and some kind of throttle con­ respectively. A stick-controlled pulse box in May. Wouldn't you know it? The typo trol. Don’t shake your head. We could do in the hands of the operator could make gremlins got in there when we weren’t barrel rolls, Cuban Eights, consecutive the pulsed signals from the transmitter vary looking, and took Mel’s chopper away loops, etc., even hit-and-gits (touch-and- in rate and width, which in turn, caused from him and gave it to his boss, Bill Ben­ goes) with no more than rudder . . . the elevator to pulse more up than down nett, and not only that, threw in his wife honest! or more down than up, and the rudder to Marilyn for good measure! Sometimes it Intermediate was the next category, in pulse more to right or more to left. . . the just doesn’t even pay to get out of bed! which two control surfaces were allowed first crude proportional control in which SOMETHING NEW . . . usually rudder and elevator, though in the model more or less . . . very often less The thirty-fifth edition of the oldest later years, before the system was changed, . . . followed the movement of the control running R/C model show, put on by the some were using aileron and elevator. . . stick. You had to see it to believe it!

George Ardwin, 52 Ely, Sabina, OH 45169, is looking tor 3-views, colors, photos, etc. on this Skylark SRX-1, built in Ft. Worth, Texas circa 1954. Test tlown by Marion Cole, it was an STOL design. Can anyone help George on this one?

10 MODEL BUILDER The third, and eventually only control system category for Pattern competition was called Multi, meaning, of course, that multi-channel radios could be used. In those days, the multi radios were based on vibrating reed systems. The transmitter emitted different tones, according to which toggle was pushed in one of two directions; up and down or left and right. Each tone picked up in the receiver caused a certain reed to vibrate, something like a tuning fork, thus closing a circuit to a relay, which acted as a switch to activate a servo in one direction or the other (It took two channels for each control. A ten-channel radio had the same number of controls as today’s five-channel radio). Lots of things depended on lots of other things, just to get a control surface to move in a certain direction . . . like having to count on sev­ eral subcontractors to do the right thing at the right time just to get one little project ADVICE FOR THE PROPWORN completed, and most of us know how often — By Jake that works . . . seldom! We have kinda wandered off the main Dear Readers: Guy Wire: Opposite of gal wire. subject, R/C model shows. In the early Open your minds and close your noses. Twisted Pair: What you get when guy and days, the shows were more like sympo­ It’s time once again for another episode of gal wires get together. siums, where leading radio control mod­ Jake’s Adventures in Glossary Land. Turbine Inlet Temperature: Degrees Fahr­ elers from around the nation, gathered For those of you who may be new to this enheit at which a Muslim comes in out of together to compare notes and trade ideas. column (although I believe the last time I the sun. In fact, the gathering put on by the District picked up a new reader was June '87), Water Ballast: Wearing a weighted shoe of Columbia R/C Club was billed as such; Jake’s Glossary of Misunderstood Model­ on the leg that isn’t bloated. the “ DCRC Symposium.” Toledo and Buf­ ing Terms is a list of definitions and/or Vintage Aircraft: Grape crop dusters. falo were among the first to offer space to explanations of modeling names, phrases, Flight Deck: Cards obtained from a stew­ manufacturers to show their products. The and jargon that hobby writers tend to use ardess. 1962 show in Toledo had about a dozen under the assumption that everybody al­ Spoileron: Turn Leron into a brat. manufacturers. Carl Goldberg introduced ready knows what they mean. Well, not Lift and Drag: How you get a drunk home. his original Falcon at this one. These and everybody does, so that’s why the glossary Thickness Ratio: Skull measurement other shows, such as put on by the clubs in is published every now and then. parameter inversely proportional to IQ. Garden Grove, California (later replaced I can’t catch them all, so if I miss your Transonic Performance: Your radio's ability by the IMS), the RAMS in Seattle (now the favorite please feel free to drop me a card to pick up overseas stations. Northwest Expo), the WRAMS in White with any terms that you don’t understand. Avogadro’s Number: Six per pound of Plains, NY, a multi-dub group in Chicago, I’ll do my best to get them defined for you guacamole. and several others, played a major roll in in a future column. Half-Round File: Government list of peo­ the progress of the R/C industry. In the Jake ple who are 50 percent overweight. past 15 years, the emphasis of the shows * * * Wing Saddle: Invention which allowed Roy has changed to being primarily a showcase Jake’s Glossary of Rogers to teach Trigger how to hang glide. for the manufacturers, who found from Misunderstood Modeling Terms F*ylon Race: Five-yard dash to see who can bitter experience that the only strictly Tri-Pacer: Three legged race horse. be first to dive on a fallen quarterback. “Trade Show” in town, that which was put Diode: The princess was in debt. Nose Wheel Strut: Proud walk characteris­ on annually by the HIA (Hobby Industries Steel Wool: Textile product obtained from tic of someone whose nose is so big it of America), did not serve their purposes armored sheep. needs a set of wheels. as well as the private shows. Have some of Oil Pan: Used by prospectors to sift oil Sonic Boom: Period following World War them forgotten this? from riverbeds. II when many transistor radios were born. So what was new at Toledo '89? There Reverse Stagger: When a drunk walks Shrink Coverings: Psychiatrists’ bed­ were many refinements and updates of backwards. spreads. existing products, but the one thing that Bending Moment: Time warp. Stall Warning: Sign in stable that says struck us as being really new was what Tuned Pipe: Plumbing that hums in C- “Watch where you walk.” might be considered a minor category. . . sharp when you flush the toilet. Stagnation Point: About 42 minutes into a covering material. Representatives of the Toggle Switch: Device which turns your Botanical Society slide show. English company, Solarfilm, which pro­ toggle on and off. Spoke Wheels: Talked about tires. duces that well known plastic covering Wing Root: Part of the wing that grows Carving Blanks: Whittling bullets that don’t film, came by our booth with something underground. work. that should interest all categories of aircraft Left-Hand Thread: Sewing supply for Hand-Carved Propeller: Usually happens modelers . . . iron on, heat shrinkable tis­ southpaws. the other way around. sue! Called "LiteSpan," the material is de­ Hardened Axle: Tough old German. Glow Plug: Old horse with a snoot full. scribed by Solarfilm as follows: “ LiteSpan is Woodruff Key: What didn’t work after Mrs. Fighter Pilot: Sugar Ray Yeager. a very light, strong, synthetic material Woodruff changed the locks. Die Casting: How old fishermen want to which is airtight, waterproof, resistant to Jam Nut: Person crazy about preserves. leave this world. diesel and glow fuels. It is heat sealed to Tail Slide: A maneuver performed in aero­ Toledo: Part of the old expression, “ It’s the model (after coating the model with batic competition. possible Toledo horse to water, but you [an] adhesive [called Balsaloc]). It is then Landslide: A maneuver performed in Cali­ can't make him drink.” shrunk by extra heat to tighten. It can be fornia when it rains. Swap Meet: Exchange ground round. painted—so it is an excellent material to Operating Range: Stove that works. Terrain Following: Putting (a golf ball). Sea Fury: Black seahorse loved by a young Binary: Requiring two hair removal ap­ Continued on page 108 boy. plications. ·

JULY 1989 11 NUREMBERG FAIR 1989 The Electric Wave

By noted European model reporter, GUY REVEL • I came for the first time to the Nurem­ berg Toy and Model Fair as a youngster. The German market was then a kingdom of small manufacturers/distributors, only one (Graupner) standing well above the others. Asian companies were numerous on the toy market but simply nonexistent for our hobby and so was, also, the Ameri­ can model industry, which was much too comfortable at home to bother about the European market. Things have changed since then. The Fair has moved to much larger premises and is still growing, by over 5% this year. The European model market is now the equal of the Japanese or the American ones and manufacturers like Graupner and Robbe, each employing well over 300 peo­ ple, are the largest in the world in their branch. Japanese and American manufac­ All these models in the Aeronaut booth are electric powered. The model hanging suspended in the turers now care about exhibiting in Nur­ foreground is a 68-inch Pattern ship by current F3E World Champion, Rudi Freudenthaler. emberg; they usually have to wait a few “Tray” style transmitters are the norm, with strated the first practical electric powered years before a space becomes available. many features unique to Europe. But more models in 1971 during the Aerobatics The German model manufacturers about that later. World Championship in the U.S.A., Euro­ dominate the European scene, although SAILPLANE ACTIVITY pean manufacturers have developed the this is not true any more of engines, which European modeling is fairly evenly split concept. This was a true work of faith as, come mostly from Japan or Italy. Even between powered models and sailplanes, although a fair number of enthusiasts fol­ radios have to conform to the German helicopters being only 5% of the total ac­ lowed through, it was certainly not enough style and are widely accepted in Europe. tivity. Some countries, like Switzerland, are to justify the heavy investments. Through­ more heavily involved with gliders (up to out the years German manufacturers 90% of the total motel activity, with four- dropped from this field, one after the stroke engines and electrics taking a fair other. Only Aeronaut and Robbe stood percentage of the remaining). Germany against the odds, continuing to develop has, up to now, a fairer balance, with sail­ planes more and more on the lead. Fields are becoming more scarce and are sub­ jected to strict limitations. As is the case throughout the world, noise is one of the biggest obstacles. However, this is only one reason why sailplanes are so popular and why the most renowned manufacturers like Graupner and Robbe have an impres­ sive number of large models, usually scale or semi-scale, in their catalogs. The upper span limit seems to be around 12 feet, with sales volume usually well into the several thousands per year, while the average size is more conservative at around 100 to 120 inches. Of course, one can find a lot of smaller manufacturers producing much larger models, but then only on a small scale of a few hundred pieces a year. Ac­ tually there are dozens of such small manufacturers specializing in sailplanes, usually of quite a high standard. This re­ flects the strength of the model sailplane market in Europe and above all in Interesting "Moseppl" by Wanitschek is a true Germany. High-performance scale sailplanes with ailerons scale model ol a German motorglider. It's an are becoming Increasingly popular. Graupner’s electric ARF with a 150-Inch span and 12-lb. ELECTRIC FLIGHT AS-W22b is available in both glider and electric Hying weight. Ever since the late Fred Militky demon­ models. Graupner photo.

12 MODELBUILDER Graupner's new electric motors Include samarium cobalts (left). Ultra 2000 Is big enough for 15-lb. models. Graupner photo.

Futaba Is introducing a new line of radios aimed at the European market. Note the tray-style transmitter. This FC-18 is the middle-range model, 10 bits PCM with extension modules and menu-driven programs. The “CAMPac” memory module memorizesall the programming data for up to The Graupner "Race Rat" can be built for either gas or electric. Features a twelve different aircraft and can even be copied to a normal PC diskette via blow-molded plastic fuselage. Graupner pic. a simple interface. Futaba photo. models at a loss, with the faith that the days of electric powered models had to come sometime. Meanwhile the field and noise problem was more acute, and the development of electric motors and batteries had pro­ gressed so far that electric powered models were flying regularly all over Europe. There was now clear evidence that electric powered models were a viable proposi­ tion. Both of the largest German manu­ facturers introduced new electric models, in 1987 Robbe’s “Arcus,” derived from a pure competition model, proved an ab­ solute best seller on the sport market: high performance at a very low price made this a good incentive for trying electrics. Thousands of kits were sold and now, two years later, sales are still ahead of produc­ tion. Last year Graupner launched a com­ pletely different kind of model: the "Elek- This delightful Pitts S-1 by Robbe is the first true-scale electric powered airplane available on the tro-Uhu” is aimed at the beginner market. European market. Robbe photo. It is a smaller electric glider with a low-price motor; it has surprising performance with a standard six-cell battery pack, thanks to its low weight, good aerodynamics and efficient propeller. Sales are astronomical. In fact German manufacturers sold more products for electric flight in 1988 than during all the previous years combined! The trend is now clear, and the same happens now in all other European coun­ tries. It was evident to me, remembering previous year's fair while driving to Nur­ emberg, that the '89 Fair was to be even more focused towards electrics. But what I saw was beyond all expectations. NEW MODELS There is a significant decline in the number of new powered models. This re­ flects the scarcity of model fields and the acuteness of the noise problems. Many fields have strict noise restrictions, engines are even totally banned from some of them. The large model (also known as "quarter scale") trend is apparently well over in Europe after having been respon­ Krause is one of the many German R/C glider manufacturers. All of the models shown here span sible for the loss of a number of good between 120 and 220 inches.

JULY 1989 13 heavily computerized. European radios are modular, the same basic transmitter being used for powered aircraft as well as for gliders or helicopters. On the upper-class radios, specialized programs are handy for flying any type of model from the same transmitter. The new program modules on show enable more than 400 basic interac­ tive mixing functions! Simpler transmitters can use extension modules to boost their performance up to almost the same level. For years European transmitters have been of the tray type, as opposed to the more familiar hand-held type used in the U.S. This is one of the reasons why the largest companies have sold own-designed radios made by Japanese manufacturers: Graupner radios are made by JR, Robbe by Futaba, and Simprop (at least part of the range) by Sanwa. Lately Graupner has even sold extremely successful specially-de­ The latest from Schluter, the "Magic" R/C helicopter. State-of-the-art design and mechanics make It signed servos more suited to specific one of the highest performance choppers available. European needs, particularly heavy-duty flying fields. Of the very few new engines had five new models, Graupner three and miniature servos for glider wings. These we could see at Nuremberg, the new 45cc this is not counting the electric powered servos are exclusive to Graupner and are (2.8 cu. in.) by Super Tigre, was almost an gliders! Just think that these are entirely not to be found in the other countries with oddity. Actually most of the new powered new models from manufacturers having JR products. models on display were on smaller manu­ already a large number of gliders of all The big surprise, this year, was the pre­ facturers’ stands. Robbe had only one small sizes and styles in their (thick) catalogs. The sentation by Futaba of a new range of model, and Graupner had a very nice aile­ new models cover the spectrum from the European-styled radios, directly sold in ron trainer and a semi-scale jet fighter for 2-meter ready-built (traditional wooden Europe under the Futaba name. Three new the smaller engines as well as a ready-to-fly structure) to the 15-foot scale sailplane for radios ranging from the simple four-chan­ version of one of its most successful train­ slope soaring or aero-towing. nel (with extension modules up to eight- ers, the “ Kadett 10 FP” subcontracted to RADIOS: channel, ten-bits PCM and advanced OK Model in Japan. None of the other COMPUTER-BASED CONSOLES computer-based programming) to the major German manufacturers had any new Radio equipment is more and more “ FC-28,” an up-to-date competition radio powered models on show. Although it was previously felt that the market could not justify new helicopters every year, both Heim (mainly through the Graupner and Robbe channels) and Schlu­ ter were displaying new models, all of them for .60 engines. A new version, with col­ lective pitch, of the British MFA “ Sport 500” was also on show. This helicopter is the only one on the European market still sold in a fixed pitch rotor head version. The Kyosho stand was proudly displaying the very successful "Concept 30” in all of its versions and Graupner acquired the Ger­ man distribution rights of the Hirobo “ Shuttle” and “ Shuttle XX” (renamed "Super Shuttle” by Graupner). Proper dis­ tribution will probably boost sales of small helicopters on the European market. Electric motors are popular with large models In Europe, as can be seen from these examples from Gliders are still as popular as ever. Robbe Graupner’s line of large scale gliders.

Above: Lightweight wooden structure is the main feature ot Graupner's "EPS 2000,” which uses the same motor/prop combo as the "Electro-UHU." Left: Prototypes of the “Electro-Pink" were flown at the F3E World Champs in St. Louis last year.

14 MODEL BUILDER with even more possibilities than the al­ ready-known “ 1024.” This marks the recognition by Futaba of the European market strength and the necessity to cater for the specific needs of the European modelers. ELECTRICS Let me tell you, the sheer quantity of new electric flying models is overwhelm­ ing. Smaller manufacturers followed the route pioneered by Robbe, Graupner and

Following the incredible success of last year's "Electro-UHU," Graupner is now producing a sportier version with ailerons, called the “Chip." Graupner photo. 7-cell class. Multiplex, Robbe and others probably know Heinz Keller as the world’s had sport trainers, which were also on dis­ most renowned competition motor manu­ play in the American stands by Midwest facturer. His samarium-cobalt motors are and Parma, the latter being better known, used by most leading competitors up to now, in the electric car field. Aero­ throughout the world, including world naut had even a true aerobatic model, champion Rudi Freudenthaler, but also by spanning all of 67 inches and designed by numerous sport modelers. Although world champion Rudi Freudenthaler. Graupner has been marketing, since last Robbe, again, exhibited a delightful scale year, a range of samarium-cobalt motors Pitts S-1 that should prove very popular. subcontracted to Hecktoplett, another Apart from the quantity of new electric well-known German manufacturer, the models, the sensation was the announce­ Robbe action is much more significant. ment of Robbe having taken over the Such high-quality electric motors will now Keller company, just a few days earlier. If you are interested in electric models, you Continued on page 78

Graupner's scale "Ventus” spans just over 12 feet with the wing tip extensions. Graupner photo. Aeronaut and now offer a number of seven-cell gliders. Meanwhile the leading companies presented in Nuremberg many larger and heavier models designed for larger and more powerful samarium-cobalt motors. The days are gone when only models designed for small motors and seven-cell batteries had any chance to sell. The new models range from the 2-meter ready-built lightweight by Graupner to the formidable 12-foot, 13-pound scale pow­ ered sailplane by Wanitschek. Also new is the fact that electric flight is no longer restricted to gliders. Both Graupner and Robbe had electric-pow­ “Saphir" is the name of this ARF sailplane produced by Robbe. As with most of the current crop of ered racers designed for the international European sailplanes, electric power is offered as an option.

JULY 1989 15 Γ/GK fCATIy/jlr. JJ • The Tigercat Mark 2 is another in my ing out the design the way I did was to series of "could-be-scale” sport aerobatic By BOB BENJAMIN . . . provide an airplane that would be esthe- designs. I interpret this term to mean that “Could-be scale” at its very tically exciting both in appearance and in the airplane might well be a scale model of best! Our author has blended flight performance. To compromise visual some full-size aircraft that never quite appeal for the sake of simplified con­ came to be, or that it might fancifully be the most pleasing charac­ struction seemed out of keeping with what scaled up to full-size. The Tigercat came teristics of some of his favor­ I wanted to do in the first place. Besides, about as an attempt to blend some of the ite airplanes into a very ap­ there are already plenty of easy-to-build most appealing characteristics of the lim­ pealing design. For .60 to .65 sport planes around. My final decision was ited-displacement closed course racers of to develop this airplane as a showpiece for the 1930s into an appealing model. There is size four-strokes and experi­ those of you who have learned to build a strong flavor of Keith-Rider, Brown and enced builder/pilots. well. I make no excuses for having made Benny Howard in this design! demands on the builder. If you like the Those of you who recall my Bobcat Mark racing airplane the Tigercat is quite fast looks of the Tigercat, but don’t feel your 2 (Model Builder, Feb. ’88) may notice a and will cover a lot of real estate in a hurry, skills are up to it, don't give up. All of us similarity; in fact, this latest iteration of the the point being that it is not a small field "old timers” started out just like you. Keep Tigercat is a Bobcat in terms of moments, airplane. On the other hand, I have tested on practicing your flying with the models airfoil, and incidents. The lines have been the prototype extensively in slow flight at you are used to and fine-tune your build­ changed to increase the appeal. The overall safe altitude and determined that it will ing skills with a couple of good rubber size has of course been reduced. The Bob­ respond safely at low speed and retains powered scale kits. The excellent kits by cat flies well on a Saito .80; the Tigercat you aileron control right up to the point at Flyline come to mind as good examples. see here uses a Saito .65. It also happens to which the wing gives up completely and Believe me, the results will be worth the fit into most cars more readily than its larger stalls out. In short, it is an exciting airplane work. I’ve been flying this airplane for a ancestor. to fly for a pilot who has some solid low- year at the time of this writing and I still get The Tigercat, like the bigger Bobcat, is wing experience under his belt. turned on just looking at it hanging on the not tricky to fly, but demands your full While laying out the structural design of wall of my shop. It has never failed to elicit attention all the time. It is by no stretch of this airplane I gave a great deal of thought all sorts of positive comments from fliers the imagination a trainer. There is a small to the demands the Tigercat will make on who see it for the first time. margin of positive stability in both pitch the modelers who build it. I’ve explained As has been the case with other designs I and roll built into the design, but for prac­ that it’s not for novice fliers, now I’ll go one have presented in Model Builder, I make tical purposes the airplane will go where it better and state that it’s not for novice use of a lot of spruce and basswood in this is pointed. Though by no means a real builders, either. The whole purpose in lay­ model. While these woods exact a small

16 MODELBUILDER At right, expert designer and builder Bob Ben­ jamin is justly proud of his latest model. penalty in weight, they return the favor amply in terms of greatly increased strength, resistance to bowing under the tension of a properly applied covering, and in dent resistance. While there is no point in trying to make a crash-proof airplane, building one to withstand all the little knocks and dings that come along makes a lot of sense. Try it, you’ll like it! Let’s build this airplane! TAIL SURFACES Both the horizontal and vertical tails are based on laminated basswood outlines, and it is with these components that you’ll need to start work. I have been using this approach to building attractive, strong, scale-like flying surfaces for some years and have long since stopped making in­ volved forming fixtures. Cut an ample supply of small blocks of firm wood that you can readily pin to your building board. Having covered the work surface with plastic, firmly pin a block on the inside edge of the horizontal tail laminate outline wherever you feel you will need a support. (Every two or three inches should do it; experiment until you find what works well for you.) Note that the laminated edge starts at the outer end of the straight lead­ ing edge and continues all the way around of the inner strip to the board and pull it strips by a half inch or so in order to pin to the inside corner of the elevator. This tightly into position against the blocks. each securely without having to remove entire length is made in one piece and Move any blocks that don’t hold the strip any pins. Using "Special T" and Kick-lt ac­ later cut to separate the fixed stabilizer in the position you want. Pin the strip as celerator, secure the starting end and then from the elevator. Lightly wet the bass strips necessary to keep it located. Now attach glue the entire strip a few inches at a time, and wipe them dry. Leaving enough mate­ the end inch or so of the next strip to the keeping it under light tension and pinning rial to run several inches beyond the ends “starting” end of the laminate. I find it as necessary as you work around the out­ of the finished piece, securely pin one end easiest to stagger the ends of the successive line. Repeat the operation for each strip,

JULY 1989 17 removing and replacing any pins on the center can be lighter. Don’t forget to leave vertical tail has been assembled onto the outside of the laminate. Repeat the se­ a 3/8-inch opening there for R-1 to fit fuselage, so that you can fair it properly quence for the other side of the horizontal through later. The dowel elevator joiner is into the dorsal stringer. tail. You’ll find that the entire surface out­ inset into the leading edges of the elevator Test fit the control horns and hinges for line can be laminated in a surprisingly short halves. Make the trailing edge gusset on the tail surfaces and set the assemblies time. Leave the assembly on the board one side of the elevator full depth to pro­ aside. until it has had a chance to dry thoroughly, vide an attachment point for the elevator WING then pull it up and true up the top and horn. Block sand the entire assembly true The main wing spar on this airplane is a bottom surfaces with a sanding block, then and round all edges to a 3/16-inch radius. little different from what you may be used trim the ends to exact length. I’d suggest These tail surfaces are intended to simulate to. Treat it as a separate construction that while you’re in the laminating business a welded steel tube and fabric structure, project in its own right and take pride in you go ahead and make up the vertical tail and are not tapered or airfoiled. doing a good job. Don’t be tempted to outlines and wingtip bows as well. Kind of Build up the vertical tail and rudder in substitute a chunk of hard sheet for the neat stuff to play with, isn’t it? the same way. Notice that R-1 extends built-up spar. It might work, but I wouldn't With the laminating complete, lay out down to the lower surface of the horizontal want to guarantee it. The entire wing was the entire horizontal tail assembly. Use tail. Orient the grain on R-1 as shown. conceived as an exercise in being different hard balsa for the leading edge and the Leave the finish sanding of the forward for the sake of enjoying good craftsman­ hinge line edges. The 3/8 sheet fillers at the portion of the leading edge until after the ship. It’s in keeping with the rationale

18 MODEL BUILDER § tt)

TIGERCAT Mk. II Span: 60 in. Area: 510 sq. in. Engine: .45·.65 4/c

-i-___ — m i f a i i Plan ΛΙο TMI

behind the entire airplane. If you’re still with me at this point, we’re in tune and I need say no more. Start building the spar by cutting out the sheet balsa center core. “ Split the differ­ ence" with the grain direction so the grain is at a 2 degree angle to each wing panel. Use uniform, hard wood and do make the cutouts at the ends of the core; the idea is to avoid any abrupt changes in the bending modulus of the spar which might provide stress foci and convenient locations for failure. Assemble the 1/4x1/8 spruce spar caps on the core over the plan; follow this by adding the 1/16 balsa sheet spar skin to the "top” face of the spar while the assembly is accurately pinned to the plan. Note that this sheet is oriented with the grain running 30 degrees off the vertical. With the skin in

JULY 1989 19 Wing fillets are Sig Epoxollte over a 1/32 ply base. Fillets are applied after Tail surface outlines are laminated from basswood strips for a more real­ the front end of the fuselage is fiberglassed. istic appearance. Simple technique is fully explained in text.

Landing gear and wing saddle detail. Note also the plywood wing attach- The cockpit area, showing the stringer fillets at former F-3A. Little details ment plate and servo tray. like this make a big difference in the finished job. place, turn the spar over and skin the other no alignment problems. Cut out all the ribs side, taking care to orient the grain 30 and the requisite stock for the leading and degrees off the vertical in the direction trailing edges for both the wing and the opposite to that of the first side. The 1/16 ailerons, lay the edges out on the plan, and sheet extends from tip to tip. Now make mark and slot them to accept the ribs. up and attach the 1/16 ply center doublers, Slip all the full ribs over the front and noting that these also should have their rear spars (if you are using a jig, do both primary grain running spanwise and “split” panels; otherwise, you’ll have to do one referent to the dihedral angle. Make up panel at a time). Line everything up in the rear spar of hard balsa and the 1/16 ply position over the plan. Add a 3/32-inch doubler. True up the edges of the spar shim under the W-1 ribs at the center and assemblies and you’re ready to get on with shim the trailing edges of all the ribs until the wing assembly. the rear surface of the main spar is exactly With a one-piece spar you will have perpendicular to the work surface. Now either to build the wing on a jig or build you can slip the half ribs in place, followed one panel flat on the board and then rock by the leading and trailing edges. Shim as the wing over to build the opposite panel. necessary to insure that these are aligned Wheel pants add a lot of class to any model. On I used the latter method. As long as you correctly and glue up the structure. You this one, the pants are held in place by the same keep the outer surface of the main spar nut that secures the axle to the sheet aluminum square to the building surface you will have Continued on page 96 landing gear.

Wlngtlp with all structure sanded to final shape. Note how the leading edge Finished wing center section shows the aileron servo cutout and aileron is notched for the ribs. Spar web grain is slanted 30° from vertical. control wires. Sig Koverall was used to cover the author’s model.

20 MODEL BUILDER CHOPPER CHATTER

By JAMES WANG

• This month, rather than attacking some heavy-duty technical stuff, we will discuss the helicopters that are available for be­ Suggested ginners and how to start flying your first Manufacturer Kit Name Engine Retail R/C helicopter. Next month we will talk GMP Cricket 25-32 $225.00 about helicopter stability and control. If Rebel 40-46 $225.00 you are a helinut, send in your subscription GMP to M odel Builder. You will be reading the MFA Sport 500 40-46 $249.50 forefront of R/C helicopter technology. A REASONABLE big "thank you” to all the readers who called or wrote. I’ll continue to answer Hirobo/GMP Shuttle (built) 28-32 $325.00 your letters as I receive them. Hirobo/GMP Shuttle XX (built) 28-32 $399.00 I assume you are reading this column GMP Cobra 40-50 $449.00 because you are interested in R/C heli­ GMP Stork 45-60 $525.00 copters. If you are an absolute beginner who has never seen an R/C helicopter, Kalt Baron 30 28-32 $399.99 what should you do? I suggest you make a Kalt Baron 50 50-60 $399.99 trip to your nearest hobby shop that sells Kalt Cyclone 50 $329.99 R/C helicopters. As a columnist, I cannot Kalt Cyclone II 50 Summer '89 be biased and recommend which particu­ Kyosho Concept 30 DX 28-32 $349.95 lar brand and model you should get. Kyosho Concept 30 DX (built) 28-32 $419.95 However, I will tell you how / got started. I Kyosho Concept 30 SE 28-32 $429.95 talked to the local shops and the local heli Miniature Aircraft X-Cell 30 28-32 Summer '89 fliers and read magazine reviews and ad­ Miniature Aircraft X-Cell 50 40-50 $599.00 vertisements. Back in 19761 picked my first Schluter Junior $459.95 helicopter, the fixed pitch Schluter Heli- 40-50 baby (now discontinued). The Helibaby SKY IS THE LIMIT was very easy to fly. You couldn’t loop or roll it, but it was very stable. GMP King Cobra 60 $565.00 I suggest three different packages for GMP Competitor 60 $545.00 different financial situations: budget, rea­ GMP Legend (flybarless) 60 $599.00 sonable, and "sky is the limit.” Table 1 is a GMP Legend (flybared) 60 $625.00 compilation of almost all of the R/C heli­ Kalt Baron 60 60 $699.99 copters sold in the U.S. that a beginner might try. If you are a student wanting to Miniature Aircraft X-Cell 60 60 $669.00 try an R/C helicopter without spending a Robbe Avant Garde 60 $699.95 lot of money, you are the budget type. Try Schluter Scout 60 $659.95 an inexpensive machine specially designed Schluter Champion 60 $629.95 for the beginner: the GMP Cricket, GMP Schluter Magic 60 Summer '89 Rebel, or the MFA 500. Any of these can be purchased for under $200. Either use your Gorham Model four-channel R/C airplane radio, or buy which uses a .30 size engine. So does Products, CA (818)992-0195 an inexpensive four-channel radio with Miniature Aircraft, who will soon release Kalt (Distributed by four servos. Next, buy an inexpensive new an X-Cell 30. Hobby Dynamics will also engine. Add a gyro and field support soon release a Cyclone II, an upgraded Hobby Dynamics), equipment and you will be in business for version of the original Cyclone. Helicopters IL (800)458-0241 about $500. These three helicopters are all in the reasonable category are not only Kyosho (Distributed by fixed pitch. I learned on fixed pitch heli­ good trainers, they are very aerobatic as Great Planes), copters and found they were simple to well. For these helicopters, I absolutely IL (217)398-2834 build, easy to repair and relaxing to fly. recommend you get a helicopter radio, Miniature Aircraft, For those planning to spend between not an airplane radio. Heli radios bring out FL (407)422-1531 $600 and $1,000,1 would suggest a moder­ the full potential of R/C helicopters. Air- Robbe/Schluter, ately priced, collective pitch helicopter like tronics, JR, and Futaba all sell inexpensive NJ (201)359-2115 the Hirobo Shuttle, Kyosho Concept or helicopter radios for $200 to $400. Add Kalt Cyclone. The beauty of these three another $130 to $150 for engine and muf­ helicopters is that they are mostly con­ fler. See the May issue of Model Builder maneuver required in FAI aerobatic com­ structed of molded glass-fiber parts; are for a comprehensive list of R/C heli radios. petition, are all .60 size, big, heavy semi-built, requiring minimal assembly For the sky-is-the-limit people, I admire machines that are stable and least affected time (about ten hours); are extremely your attitude! The hobby shops love you by strong wind. Think of them as the Navy’s stable, and each costs between $300 and even more. The GMP Competitor, King F-14 Tomcat: they are fast, rock solid and $400. The alternatives are the GMP Cobra, Cobra, Legend, Kalt Baron 60, Miniature mean business. They are great investments GMP Stork, Kalt Baron 50, Miniature Air­ Aircraft X-Cell 60, Schluter Champion, if you like this hobby and have the cash. A craft X-Cell 50, and Schluter Junior. They Scout, Magic or Robbe Avant Garde each top-of-the-line helicopter radio can range are of all metal construction, are medium cost between $500and $600. We are talking from $500 to $1,000, although a $300 to size, use .40 to .50 size engines, and cost about toys the big league boys play with: $400 to $500. Kalt also makes a Baron 30 contest quality machines. They can do any Continued on page 87

JULY 1989 21 PRODUCTS IN USE

By JAMES WANG • This month we will look at the CMP Legend, a lean and mean .60 size fully aerobatic machine that cruises at around 65 mph. The Legend is extremely fast be­ cause it has a slim profile canopy and a low-drag flybarless main rotor design. Re­ search on full-size helicopters has shown that the main rotor head, shaft, swashplate and mixing unit can contribute up to 50% of the total drag on a helicopter. Thus, removing the flybar and seesaw assembly can significantly reduce the total drag. Furthermore, a clean rotor head improves the air flow to the rotor disk during an autorotation maneuver. My Legend is powered by a pump equipped O.S. .61 rear exhaust with a Hirobo/GMP mini rear exhaust muffler. This very compact box-like muffler hides underneath the helicopter and is very in­ conspicuous, but its small chamber might constrict the exhaust and reduce the en­ gine's power slightly. Still, my friends and I GMP's John Gorham looks on as son Robert mows the grass. With the proper radio (such as the have timed my Legend through a 200 meter Alrtronlcs Quantum) the Legend is capable of awesome performance. run, and it clocked about 65 mph. With a modify your horizontal tail to a rotatable case you want down elevator as you push Hatori or Magna pipe, this thing would flying surface. The Futaba 1024H and JR the cyclic stick forward, and up elevator as really take off! PCM 10 radios have general purpose mix­ you pull the stick back. For aerobatic fliers, A top-of-the-line aerobatic machine ing functions that can also couple in a sixth a strong coupling of the horizontal tail and certainly deserves a top-of-the-line radio. I servo, but they are not specifically designed the fore/aft cyclic stick can improve heli­ chose to install a brand new Airtronics for SES. I am interested in this feature be­ copter longitudinal control. Now you can Quantum 8 channel radio in my Legend cause many of the state-of-the-art full-size do a super-tiny and fast loop. For this case for a few reasons. The first reason is that helicopters like the Apache AH-64, Sikor­ you want plenty of up elevator as you pull the Quantum is the only helicopter radio sky Blackhawk UF1-60, etc., have this fea­ the cyclic stick back. The Quantum 8 has on the market, at least as of this writing, ture to improve the flight dynamics. For two trim pots for you to adjust the coupling that has a capability to couple in an extra instance, in high speed forward flight heli­ any way you like. Of course, I had to modify servo to vary the horizontal tail’s incidence copters always fly in a nose-down attitude, the horizontal stabilizer on the Legend to a in flight. In other words, you can program so you would want the horizontal tail to moving control surface. the radio so that when you move the fore/ deflect its leading edge up and thus reduce The second reason I chose to install the aft cyclic stick, a sixth servo will change the the severe nose-up tendency that a fixed Airtronics Quantum radio in my new angle of attack of the horizontal tail. Air­ tail will produce. This reduces the stress at Legend is the excellent 94735 servos. The tronics calls this a Synchronized Elevator the main rotor hub and improves the dy­ Airtronics 94735 servo is specially designed System, or SES. Of course, you have to namic stability of the helicopter. So for this for R/C helicopters. It has 75 in.-oz. of

All Legend kit parts come sealed In numbered plastic bags. Main rotor and At only 8-1/2 pounds the Legend Is one ol the lightest .60 size choppers wood servo trays are factory pre-built. available, makes for phenomenal acceleration.

22 MODELBUILDER PRODUCTS IN USE

Above: Airtronlcs Is the only manufacturer that Includes live servos with all ot Its helicopter radios. All meet 1991 specs. Right: a 700 mAh receiver pack Is standard. Our author uses a 1200 mAh pack because he uses it to also run an Airtronlcs SG-1 yaw rate gyro. torque (typical servos have 40 to 50 in.-oz.), high speed (two seconds for 60 degrees of travel), and a very quiet coreless motor. It is in the same league as JR’s top-of-the-line 4000 series servos, and Futaba’s S9 servos. The third reason for installing the Quan­ tum in the Legend is that I wanted to try out the new Airtronics SG-1 gyro system. It is an excellent unit. It has recently replaced the older Airtronics gyro. You might still be able to pick up one of the discontinued gyros. They were one of the least expensive yaw rate gyros on the market and even include inflight switchablesensitivity. They were good and very inexpensive. Another reason for using the Quantum radio is that it has four pitch curves. This Above and right: two views of the Legend's rotor allows me to play around with the engine/ head, the most important ingredient in any heli­ collective mixing to optimize the heli­ copter's tlight dynamics. This particular one is a copter for hover, aerobatics, and auto­ flybarless Delta-3 design. A flybared head is also rotation. available to first-time pilots. The two control rods from the swashplate go to a mixing arm, then to Usually I prefer writing technical heli­ the rotor blade pitch arm to provide mechanical copter articles instead of doing reviews. I advantage to reduce the loads on the servos gen­ am a little wary of writing review articles erated by the blade airfoil pitching moment. A because no matter how careful he is, a symmetrical airfoil would have zero pitching reviewer might miss mentioning some moment. features, or with one slip of the pen he also try to avoid exaggerating the review designing real helicopter rotor systems, might doom a manufacturer’s sales. Of because that would certainly upset and be blades, etc., building a different R/C heli­ course, I believe the reviewer has the ob­ unfair to other manufacturers who also copter each month actually helps me with ligation not to lie about flaws, but my policy produce quality products. In the future insight into full-scale design ideas. Building is to check with other fliers and the manu­ you will see many reviews of different and flying more helicopters gives me an facturer to see if there have been other brand helicopters, radios and engines. I opportunity to be more familiar with all occurrences. Then if there indeed exists a will avoid saying things like "Screw bolt A the available R/C designs so I can write problem, I will forward the manufacturer’s to nut B, then connect rod C to lever D.” better technical articles for our readers. suggestion and tell you my own remedy so Rather, I will concentrate on the technical you will not have to worry and stop flying. I merits and flying qualities. Since my job is Continued on page 101

JSSi—

With the canopy removed you can get a good view of the Legend's clean, The Legend does beautiful autorotations because of the 165 gram businesslike mechanical layout. weighted blades and the clean flybarless rotor head design.

JULY 1989 motor system in mine. The fuselage was cavernous and easily accepted the 28-cell pack of 1200 mAH Sanyo batteries. I ex­ pected it to barely whisper around the field at treetop level, if this 13 pounds worth of yardsticks and Elmer’s glue flew at all. "What a surprise! She jumped off the runway in twenty feet and climbed un­ comfortably high in just two minutes. The glow version was sick by comparison. My electric monster could make two or three high climbs, and flights averaged about ten minutes, which is long enough to tie up any frequency pin at a busy R/C field. I flew the E-powered Yardstick for a couple of years and when I finally did sell her the airframe was still squeaky clean (all the original glow-grease had been cleaned off by then). • We never hear much about big electric voltage and amperes necessary to motivate “ I decided to design an airplane in honor birds, so it seemed about time to air the big R/C aeromachines. They do represent of my three ‘bestest’ pals, Les Hard, Al subject. But since my hands-on experience a lot of bucks but will give years of de­ Alman and Bumper Lyons (all IMAA with electrics is almost zilch, I finagled that pendable use; truly a one-time investment. members/officials), and thus emerged the almost legendary and verbose Norseman, "These vibration-free and diminutive LAB-13. Even the original airfoil was named Crash Evanson, into blessing us with his motors immediately impress the nitty-gritty LAB-13. This machine started out as a tri­ subtle thoughts and opinions . . . and scale set (those builders who can make motor (one tractor and two pushers) and whatever other stray poop he’s run across mom’s hair curlers look like machine guns) amazed lots of people by flying well. But during his unending quest for the ultimate because these prop turners will snuggle after having to repair the wing trailing edge in quiet power. Here’s what Crash has to nicely inside an Aircobra cowl and still have for the umpteenth time, I decided to install say: room left for the retractable nose gear. the 'big one,’ a Cobalt 60, and see if this “ Al, I’ll be happy to insert some extra­ And extension shafts work well with elec­ 88-inch bird could handle the weight and neous thoughts about big E-power on the trics because of the lack of piston-pound­ power. premise that my learned observations, plus ing explosions, thereby opening the door "I sweated unnecessarily; she climbed my opinions, are my own and do not rep­ to many applications previously thought out briskly and became a mere flyspeck in resent the Gospel or the demeanor of you impossible. less than a minute. or MB. “ Obvious is the electric motor’s ability “ Here in MinneSNOWta winter flying "Let me preface this blurb of mine by to become a pusher simply by reversing can be an absolute hassle at best, but with saying that motor driven R/C vehicles have the motor leads—no special props re­ 10,000 flying fields (lakes), electric power only been with us for a relatively short quired. Now that Dornier 335 Arrow proj­ really comes into its own. I usually charge period of time (when compared to free ect you’ve been dreaming about becomes three or four E-birds, toss them into the flight) so no one, especially this writer, realistic. And those two, three, four, and truck and silently enjoy winter’s beauty knows it all. In fact I’ve been known to six-engine aircraft avoided up to now be­ while pushing the gimbals. . . and the en­ make mistakes and even overstate things cause of inherent operational problems of vironment loves me. Usually the thermos at times. using either two or four-cycle engines also runs out of coffee about the same time my "At the present time there are two basic become a reality; exact rpm’s every time, frozen fingers quit functioning and my (American made. . . the best!) powerplants from idle to full power . . . without the dripping nose signals the end to this mad capable of supplying adequate thrust for vibes. delight. Sometimes a rabid skier or de­ giant scale applications: the Astro Cobalt "In 1985 a buddy and I built Yardsticks mented ice fisherman will ask, ‘Whatcha 40 and 60. These two large space-age (April ‘85 RCM) for just plain fun sport doin?’ . . . and I’ve yet to figure out a good motors have Samarium magnets and are flying. After a year of comparing notes us­ answer. capable of sustaining large amounts of ing .60 glow engines, I installed a Cobalt 60 "Back to reality. There are certain guide-

Three of Crash Evanson's big E-powered birds. (I to r) Cobalt 60-powered Yardstick, an original design with four Cobalt 05s, and the LAB-13 as a tri-motor. Sorry, the prettiest model in the photo was not identified.

24 MODEL BUILDER The LAB-13 on snow, using a skid lor landing. Span is 88" and prop Is a Some of Crash Evanson's gas guzzlers, proving that he really does tly all Giest 13x8 (older. kinds of BIG Birds. of us who can afford thousand-dollar dis­ prop’ (thinning the blades helps a lot), and posable airplanes. ‘Nuff said! it takes a bit of experimenting to find the "Paging through some of my old dog­ correct one. For instance, the old Yardstick eared aero-mags I ran across a bunch of would hardly fly on a 16x4-1/2, but when a airplanes suitable for E-power. Lemmesee 13x8 was bolted on she became a tiger. . . . of German WWII vintage there was a "In regards to cooling the battery pack, I glider tug (two )U-88’s bolted together) do not do this—they get hot from the in­ with five engines, and a couple of giant side out, anyway—but I do remove it from freighters with eight mills. Of course, any­ the bird after each flight. Never charge a time a Hughes Spruce Goose shows up at hot pack as venting can occur and ruin said the field it’s a show-stopper. power supply. On the other hand, cooling "I've read that Tony and Addie Nacca- air should be allowed to flow through the rato’s B-36 flies beautifully and that Keith motor. Letting the motor hang out in the Shaw’s twin-engined Comet has to be seen breeze is one way to accomplish this, but to be believed. There are countless scale on tightly-cowled designs I just cut a hole aircraft of multi-engine configuration cry­ in the pointy end of the spinner plus a few ing to be modeled, and with our current strategically placed holes in the spinner state-of-the-art electric systems the door is backplate and add an outlet somewhere Crash's portable E-power fueling station for re­ wide open even to average builders like unobtrusively. mote operations. Includes car battery, meter, and Astro Flight Charger that'll handle up to a 28-cell pack. Dolly makes for easy towing. lines when messing with electrics, but re­ member that none of them are set in con­ crete. “ 1) Weigh your motor system. This should be about half of your total ready- to-fly aircraft weight. The formula is ad­ justable, however, by using larger wings and cleaner airfoils. “ 2) Mount your tailfeather servos be­ hind the trailing edge of the wing since the space they used to occupy is now filled with your motor batteries. "3) That large space that used to contain the fuel tank can now be used for your motor control, either of the electronic variety or a simple servo-operated on/off switch. “ 4) A fuse is highly recommended to save the motor from frying due to a mishap. "5) If you add another motor to your system, add a cell to the battery pack— which also holds true for the addition of an Crash's B-l-G Cub. Wheel covers help anyone who might possibly not recognize the aircraft! electronic throttle. Luckily the Super myself. "Modern electric power systems are Charger marketed by Astro Flight doesn't “ A very frequently asked question is, quite capable of propelling just about any give a hang what your cell count is. ‘How long will the motor run?’ It’s not gas engine model kit made (avoid anything “The FAI recently outlawed electric easily answered because there are so many with extensive fiberglass or foam com­ power for world class scale events, prob­ variables. A battery pack is much like a fuel ponents for openers). To the best of my ably due to its absolute superiority (I'm not tank in respect to its capacity. You can go knowledge there are no Giant Scale E- really too surprised considering their track full bore for two to four minutes, or you powered kits available; however, there are record; they seem to eliminate the fun can mete it out (via an electronic throttle) lots of sailplanes and some lightly loaded element in anything they get their hands for four to six minutes. gas powered biggies like the Sig Kadet on). Thank goodness we in the noncom­ "O f course, longer motor runs are within Senior, and they will convert nicely to petitive sport of Giant Scale don’t have to your grasp by simply using a smaller prop. adhere to FAI mandates, as there are few In E-power every design has a ‘right-sized Continued on page 72

JULY 1989 25 some confusion is coming along with it. First of all, PCM is not really modulation as we normally speak of it, which is the modification of a radio wave for informa­ tion carrying purposes. We normally use one of two methods of modulating the R/C signal, either AM (Amplitude Modu­ lation) or FM (Frequency Modulation). Before we reach the modulating stage in

ί3 ίΰ ϊ* ϊΐι:ϋϊ* By ELO Y MAREZ

DIAL 976 fOR R/C? (714)455-9888 is another good number, A valuable Item to have at any flying Held is the I just ran across an ad for an information at which you can expect a cheery “Good “TxCheck” hand-held RF monitor by Kraft Mid­ service which claims to give you the answer morning, Futaba!” every time you dial it. west. Details in text. to anything you need to know about any­ Futaba Corporation of America also has a the R/C transmitter we must translate the thing R/C. Just like the 976 numbers, it new home: 4Studebaker, Irvine, California mechanical stick inputs into electronics, a opens its fountain of information to your 92718. For those of you in the local area, job that is done by the encoder. The MasterCard or VISA card—$3.00 per shot. I that is off Alton Parkway at Jeronimo. sequence then is the encoder first, the haven’t tried it, so I will withhold any Futaba’s new 100,000 square foot home modulator, and lastly the RF amplifier. The opinion, except to say that I can’t imagine has got to be the largest in the hobby PCM signal is generated in the encoder, in any person or persons who can honestly industry that is devoted exclusively to the same manner that the older style pulse claim to know everything about any single electronic products, and should insure that width signals are generated in AM or FM subject. In short, I have enough doubts to all phases of its operation will increase in transmitters. In the switchable transmission not pass along the number. However, I do efficiency. One more note for you local mode transmitters now available, a choice have other good numbers for you: aficionados: should you need service, call can be made between PCM and PPM, (619)728-0440—the new number for for an appointment and ask for Kelly! which stands for Pulse Position Modulation Authorized Radio Control Service, late of The area in which Futaba is now located and refers to the older pulse width encod­ Orange, California. Don McCarthy has is a highly restricted one, and s very close ing methods. moved, kit and kaboodle, to 327 S. Stage­ to the landing pattern for nearby El Toro Before I go any further, I would like to coach Lane, Fallbrook, California 92028; Marine Air Station, which is too bad, since clarify another confusing point, in that down towards San Diego from where he the building is large enough to fly off of. while the transmitters are switchable, the used to be. ARCS is your best West Coast Maybe the next one! receivers are not, and a PCM receiver must service center for some of the currently PCM AND FAILSAFE be used with a transmitter switched to available equipment as well as for the I have discussed both subjects before, PCM. Ditto for FM! oldies but goodies (such as Kraft), and can on and off, but there seems to be a much Now, after this encoding has taken place. often make mods and changes that the greater swing to PCM (Pulse Code Modu­ original manufacturer does not offer. lation) now that 1991 approaches, and Continued on page 92

Futaba’s new home Is this 100,000 square foot building in Irvine, California. Service facilities are located here also.

26 MODELBUILDER By DICK HANSON

• Dear fellow modeler; This is an open letter to all those inter­ ested in Pattern flying, be it A.M .A., F.A.I. or any independent governing body. I personally feel that a change in equip­ ment rules, specifically engine rules, is in order. An apparent conflict of interest exists in that we have an engine size rule, a maxi­ mum weight rule and a new set of noise level rules. If our objective is to allow models of a moderate size and weight, then the weight rule is necessary. If we must reduce noise levels in order to satisfy community desires, then a noise rule is required. Why then must we regulate the engines to be used? Originally we all used very ordinary two cycle engines. No pipes, pumps etc. As larger engines became available, a limit was put on displacement in order to con­ Portable transmitter charger has a sell-contained battery and allows one to top off the transmitter trol the size of the models used. It worked battery right on the flight line if necessary. very well fora number of years. The weight edge. Our present rule, it seems, has a according to George, an almost identical rule also served as a method of keeping tendency to obsolete all but a few engines. point of view. size and I suspect safe'v at an acceptable Please give this proposal some shared I was surprised but after thinking it over I level. thought with your friends. I will be happy came up with the following assumption. The issue of noise is now the controlling to discuss it further with any interested The four-cycle 1.2 cu. in. engines are prov­ element in equipment used. It is also the parties. ing to have much more usable power than one rule which promises to change due to Sincerely, Dick Hanson the .60 two-cycle engines. If they prove to community influence. be popular due to the larger, heavier The size rule is now rather academic in ♦ * * models they will pull, the Europeans will that our .60 size engines just will not work A few weeks have passed since I wrote be required to use similar powerplants. A competitively in an Π -lb. model. the above letter. Copies were sent to a simple rule change by the F.A.I. could If Π -lb. models are acceptable, why not number of active pattern fliers as well as change the engine rule to allow the use of eliminate engine rules altogether and go some well-placed A.M.A. people. any 1.2 engine (or perhaps a change to .90 with a weight maximum rule and a noise Feedback has been minimal—as ex­ two-cycle types), which would knock out rule? This would also allow much greater pected. any advantage the four-strokes may offer freedom in design work. George Manning, who is an active flier at the present time. I think this is a definite Would dropping the engine rules ob­ from Southern California, did offer some possibility and I base this assumption on solete much of our present equipment? / very interesting information. While he was past changes that the F.A.I. has accom- believe it would have the opposite effect attending the T.O.C. event last fall he had a in that no particular engine would have an talk with Hanno Prettner who expressed, Continued on page 77

Two views of Dick Hanson's homemade “Microtray," European style transmitter tray. Transmitter itselt Is held in place with Velcro. Compartments on the side contain equipment that might come in handy on the flight line.

JULY 1989 27 hat we'll make you an "old pro” in one season . . . all from your easy chair! What Is A Thermal? 5J/3 A thermal is a rising body of air which is warmer than its surrounding air. There are two main “ models" (see Figure 1) which By BILL FORREY represent the physical appearance of ther­ mals: the intermittent "bubble” or vortex THERMAL FLYING: that makes your heart race. ring which represents the most common THE HOWS AND WHYS “Get real," you say out loud, “Get a form of thermals; and the "dust devil” It’s summer. The skies are blue and grip!” You know from experience that the (visible or invisible) which represents a beckoning. There’s a light breeze, and it’s fun you always have will outweigh every­ rarer, more constant or even stationary only 75 degrees. Your sailplane's radio sys­ thing else. So you pick your imagination form of thermal. tem has a fresh charge, the lawn’s been up by the nape of its neck, reprimand it for Thermals can do almost magical things mowed, and you have a few hours to its insubordination, and finish packing the to flying machines and soaring birds. Per­ yourself. car with the determination of a Chuck sonally, I get a kick out of showing some­ What comes next? Loading the car with Yeager. A minute later you’re headed one a thermal who has never seen or heard the flight box, the hi-start, and that big toward the local glider field with mental of the phenomenon before. Statements beautiful bird! pictures of flying into 300-foot-a-minute and questions like, "I can't hear any engine. Only one problem. It’s been six months "hat suckers.” What's making your airplane go up?” are since you last flew a sailplane. You know We’ve probably all had moments of ir­ common. Knowing what we do about you’re in need of practice because last rational thought like this at one point or soaring, we could all be medieval wizards year's flying season ended just as you were another in our flying careers. They come if we could travel back in time with our model sailplanes. How Does A Thermal Form? Thermals are formed when cool air passes over a source of heat and is warmed by it. Warm air, of course, rises. The thermal source can be literally any large surface which is warmer than the air that surrounds it. The surface usually absorbs heat from the sun more rapidly than its surroundings and readily gives off its heat to the air. A few of the most common thermal sources are plowed earth, dry grassy areas, man-made surfaces such as a gymnasium rooftop, or a dirt or asphalt parking lot. Even unlikely sources produce thermals. I have seen vultures thermaling over a Cal- trans Park and Ride lot here in Southern California at a shady, cool, 7:00 a.m.! The 50 or so hot engines produce enough heat to generate an early morning thermal. Often a line of trees will generate a getting the hang of it. from the insecurity of inexperience. With stream of bubbles. What happens in this As you pack the car, you envision an time, they stop coming. What I’ll attempt case is that the trees shelter the ground on embarrassingly short flight in front of your this month is to speed up the process for their leeward side. The cooling wind is old flying buddies. Did you imagine laugh­ those fledglings out there who are in­ blocked. The relatively stagnant air gets ter? A little "friendly” ribbing aimed your terested. heated by the sun-drenched ground, and way? The vision causes butterflies to We’ll offer some ideas about what ther­ then it rises in periodic bubbles. bounce around inside your guts. Your mals are, what they look like, and how A row of trees may be solid enough to nerves are on edge. You’re light headed sailplanes react inside them. We’ll discuss form a very efficient wind barrier. On the with excitement, anticipation, and a per­ how to work a thermal, and then how to windward side, the breeze is forced up haps an occasional squeeze of adrenaline land. With all that information under your and over, forming wave lift on top. But I'm

28 MODELBUILDEFt wandering away from the subject of ther­ What Kills Thermals? mals here. Perhaps in a future article we By contrast, any potential thermal source could cover wave and slope lift. can be affected negatively by many factors. Thermals tend to be cyclic, coming in A stiff wind will keep the air mass moving periodic intervals of time, often quite so fast that it doesn’t have time to get warm. regular. Bubbles of boiling water make a Wind often is so turbulent that what little good analogy. If you can imagine a puffing lift there may be is quickly mixed up with steam locomotive traveling down a track cool air and destroyed. Sometimes this lift you have yet another picture of a periodic is very hard to distinguish from just plain thermal. rough air. Usually you get suckered into It is hard to be dogmatic about the shape making a circle with your sailplane. That’s or size of thermals. Thermals can be as when you find out you’re in sink! small as the tightest circle your glider can Another major factor is the position of fly or as large as entire fields. Often during the sun. If it drops too low in the sky, it will contests, one flight group can take off and no longer heat the surfaces likely to pro­ every model will go up practically without duce thermals. Certain dense surfaces— respect to location. The next group will concrete for example—which have high launch and the field’s cycle will be between thermal mass will continue to give weak lift puffs. The models will be on the ground in after sunset. However, sources like these two or three minutes. eventually die. Mornings and evenings are Air is a gas. Breezes can be very turbulent poor times for strong lift. Shadows can also and have many horizontal, vertical, or even ruin a likely thermal source. spiral wind currents caused by obstruc­ A lack of heat contrast in the surround­ tions. These could be houses, trees, passing ing area will likewise hinder strong thermal trucks, local topography, etc. Turbulence be representative of the strong core of development. If you were flying over a can sometimes be mistaken for lift. rising air, and the irregular outer edges the large, dry lake bed at noon in July with no As shown in Figure 2, the “top view” of a unstable, turbulent "sink air.’’ Lift proceeds wind, you would be as likely to find ther­ thermal bubble may look like anything up the stem, cools, flows outward, and mals as snow balls! from a perfect doughnut shape or smooth then sinks. How Do You Use Thermals? mushroom, to the lumpy shape of a head Here we probably run into as many fly­ of mutant broccoli! (Hey, stop laughing. ing techniques as pilots. There are, how-

FIG. 9 WINDSHIFTS Due FIG. II ND TO passing lift < φ > fttjOT y 1 l i l J I / 1 ]v V * y a

JULY1989 29 ever, a few widely accepted rules for ther­ just push it away. This model may try to mal flying. The illustrations I’ve drawn show bank in the direction of the core as it sinks these rules of thumb. Unfortunately, the if the outer edge is well defined. Just below ILPLM€jL models are drawn somewhat larger than this area on the outside the thermal is likely r/'riM xTirsM1 4 k they would appear in real life in relation to to be turbulent sink as air rushes in to fill the size of the thermal. Just picture them the void created by the rising thermal. smaller and you will get the idea. Model D is the guy who spots a thermal The first step is recognizing a thermal and flies over to enter it, but arrives too when your model encounters one. Ob­ late. His buddies’ planes are rapidly going viously, you would expect the model to go out of sight. Unfortunately, the thermal up. True, most of the time that's what has passed through already and only a little happens, but not always. Let's look at the residual “ zero sink" air remains. He will internal structure of our thermal models, need to find another ride in a different then place a few models inside each. area, or if the bubble frequency is close Figure 3 is the classic thermal bubble or enough, wait for the next bubble. vortex ring. These are practically impossi­ Figure 4 is the thermal column, or slow- ble to see due to their gentle nature at motion tornado. Often called a “ dust ground level. They tend to pick up no dust devil” or “ trash mover," this thermal is or paper to make their presence known. frequently visible because of the insects, However, the soaring birds and insect dust, or paper particles that get sucked up

The Sitar Special 100 is one of several high-performance sailplanes being imported from England by Global Hobby Distributors. See text for more details on this and the other models shown at right. hunting birds find them and often mark inside. Polarized sunglasses can sometimes their presence in large numbers which in help you see this kind of thermal. The sky many cases actually define the outer fringes has much polarized blue light. Polarized of the bubble very graphically. sunglasses darken this light. When this light In Figure 3, the model sailplanes E and A hits the minute dust particles, it becomes a are passing over a developing bubble and little less polarized and a little more ran­ through the top of the bubble respectively. dom. The result is a lighter shade of blue in This case is the most obvious. the shape of the thermal column. The Models A and E may encounter a little necessary ingredient, of course, is dust. sink just before they enter the thermal. Model A in Figure 4 has just hit the They may be pushed away from the core column head-on. Provided the pilot can of the thermal if they hit off center. They center or "core” the thermal, he will have may even encounter a slight increase or a nice, long, high, thermal ride. decrease in speed if they hit head-on. Model B has just grazed the core and is However, providing they can circle cen­ experiencing a shove upwards and away tered over the core, they are soon climbing from the core. This pilot needs to turn into strongly. the core, fighting the outwards shove. Because the thermal bubble is cooling Model C is outside the thermal com­ as it rises, the top of the thermal is rising pletely. He may experience light sink air. If slower and flowing outwards to make nobody spots the thermal for him, he may room for the heated air that is coming up never find it. So close . . . yet so far away! from below. These two models may have Model D is firm ly entrenched in the trouble staying centered in the thermal. core. He has it made! All he needs to do is Their pilots may have to constantly re- adjust his center once in awhile, and he is center their birds. Each will settle down in on the elevator UP! an area near the top of the thermal which How To Center A Thermal matches their sink rate (relative to the vor­ Many years ago, when I was first learning tex). The thermal vortex will carry them how to thermal, I had the help of such upwards until it cools and loses energy. early LSF Level V and National Champions Model B in Figure 3 will experience the as Chris Adams, Terry Copeland, Rick strongest lift inside the thermal and soon Pearson, and Jerry Krainock. Each was a will be up with A and E. Model B will have very accomplished flier at that time, and an easy time staying centered in the core each had their own suggestions on the of the thermal. best way of thermaling. Model C will experience sink that may try to suck the model towards the core or Continued on page 93

30 MODEL BUILDER MODEL DESIGN & TECHNICAL STUFF By FRANCIS REYNOLDS

• To continue with the preliminary design R/C seaplane models ranging from a 2-1/2 of Sea Fli XI, the R/C flying boat that we ounces per inch of beam, to 25 oz./in., started last month, let’s get down to the with the majority falling in the 10 to 20 seaplane part. If you just came in, see not oz./in. range. With the 6-1/2 inch beam I only MD&TS for June, but also the con­ chose for Sea Fli XI, and its weight of seven float bottoms. Flat-bottom models may ex­ struction article for this airplane in the same pounds or 112oz., we have a beam loading perience shock levels that an on-board issue. Remember our code: (April '89) of 17.2, which works fine. pilot wouldn’t like, but the R/C link com­ means, “ Please reread the April 1989 col­ One thing that Lennon neglects to say is pletely protects a remote pilot from such umn of MD&TS where we discussed this that beam loading varies with the size of physical abuse. At any rate, flat bottoms on point in more detail.” the airplane, like wing loading does, only models work just fine. They are more effi­ Hull worse (Sept. ’88). With wing loading we are cient and easier to design and build than This is the challenging and interesting dividing a cubic function (weight) by a vee bottoms. area. Designing a conventional landing square function (area). With beam loading, By “flat bottom” above, we mean flat gear is very simple indeed compared to it is cubic weight divided by a linear di­ laterally, but what about longitudinally? It designing a hull which will float the plane, mension, so beam loading, like span load­ is definite that the bottom ahead of the support it in the right attitude, permit it to ing, will vary as the square of the size of the step needs to be straight for some distance. taxi slowly under directional control, tran­ seaplane does. We need to use beam cube Curvature in that area, like that on an old sition to the step, accelerate up to flying loading (divide the weight by the beam row-boat bottom, would be a big mistake. speed, take off at a range of planing angles cubed), but that is for another day. The effect of a rounded bottom fore and compatible with required wing angles of The significance of beam loading, cubic aft is to pull the hull deeper into the water attack, and reverse all this for landing. The or not, is that if the beam loading is too as it accelerates, and make planing difficult hull should also be easy to build, rugged, high on a particular airplane it will require or impossible. Let’s look at the bottom near light in weight, and have low aerodynamic excessive power to get up on the step and the bow. It is traditionally curved up at the drag. All this isn’t too tough if we design it accelerate to flying speed. The hydro- front. Paul Weston and I suspect this may one step at a time. dynamic lift will be poor and the hydro retard the rise up onto the step in some Flotation drag will be high. If the beam loading is seaplanes, by tending to suck the bow One cubic inch of water weighs .036 lower than it needs to be, the hull will be down when the plane is just getting started pounds, so to find out how many cubic big, pound harder on rough water, skip on and has not yet risen significantly. I intend inches of displacement we must design takeoff, weigh more, and have more aero­ to do some book research and perhaps into our seaplane to make it float, we divide dynamic drag. We want a big beam with a testing on the water on this question, but the weight of the airplane in pounds by big wing and vice versa, to provide a for now, we may be designing better than .036. Our airplane is going to weigh 7.0 smooth transition from hull support of the the rest of the world in this particular area, pounds. (How do I know? Just take my weight to wing support at takeoff. by avoiding bottom curves even at the word for it.) Actually we have to provide The sides on older floats and flying boats bow. Have a look at the drawings in the quite a bit more flotation than that to keep were usually parallel, giving a constant construction article for Sea Fli XI last the plane from going partially under from beam, but there are things to be gained by month. You will even find a small step up waves, crosswinds, etc. starting with full beam somewhat ahead of near the bow, to improve initial hydro- Static Attitude the step and tapering it to less beam at the dynamic lift still more. In addition to making the plane float step. For one thing, it reduces the aero­ The Hump level laterally, we must make it float at an dynamic drag and improves the looks. Stinton, in his book, The Design of the acceptable pitch angle. Bow-down is not Also, it gives a higher beam loading when Airplane, states that "All (full-scale) sea­ an acceptable pitch angle. No amount of the plane is fully up on the step, which planes have had marginal performance in up elevator or throttle can get the nose up reduces skipping just before takeoff and the vicinity of the hump.” “The hump” is at the start of taxiing if it is not already up. A just after landing. At lower speeds, when the point in the takeoff run where a full- bow-down condition is the result of having more bottom is on the water, it provides a scale seaplane is trying to get up on the too much of the total buoyancy behind lower beam loading for more rapid rise- step. At this point the nose of the plane is the step. out. pitched up sharply, the drag is at its maxi­ Beam Loading Flat Bottoms mum, and with full power the plane slowly One important dimension in hull or float All full-scale seaplanes have vee bottoms climbs out on top and then begins to ac­ design is the beam, or width of the planing to reduce the pounding in rough water. celerate much more rapidly. The hump surface. This is the hydrodynamic equiva­ Modelers build them both vee and flat. I can be seen on a model seaplane takeoff if lent of the span of the wing. Designers talk always design flat bottoms unless it is a the throttle is advanced very slowly, but it about hull or float "beam loading” the scale model. I fly from pretty rough water is certainly not a problem. Good seaplane same way they talk about wing loading. sometimes, and haven’t been able to iden­ models get up on top so fast one couldn’t Andy Lennon, in his book R/C Model Air­ tify any structural, radio, or other damage plane Design, shows beam loadings for which could be attributed to flat hull or Continued on page 74

JULY 1989 31 cabin built directly on a Playboy fuselage, thus resulting in smaller windows. Still is attractive. The third way with even more variations is the McCoy Playboy with large windows, however, not extended to the end of the wing saddle. Kinda like Erskine Caldwell, "You pays yer money and takes yer choice.” Photo No. 4 is what this writer thinks Old Timer flying is all about: FUN! Joe Elgin, • This month’s column starts on a note of pure nostalgia as can be seen in Photo No. 1 showing Red Barrows’ model of a nine- foot Shereshaw Champion. This shot, taken 16 years ago in San Diego, was one of the first O.T. R/C models built by Pond and Barrows. We built two Champions; the twin, an all white version, is still around serving as the SAM 21 club trainer. Good thing Shereshaw designed rugged models as many a tyro has learned on it! This writer can still remember the now deceased Lee Norcross, who asked to fly the model at Taft. Thinking that Lee had some R/C back­ ground, I allowed him to fly the Champion. After about ten minutes, Norcross brought the model in fora landing. Whata landing! The model was all over the ground, sky, you name it. Upon ragging Lee about a bum landing, he replied, “ What did you expect ? This is the first time I’ve ever flown R/C!” After recovering from that shock, this writer only mentions the above as it does prove that the big Old Timer models are the best trainers for learning how to fly R/C. 1. Red Barrows' Shereshaw "Champion" cruises overhead. Pretty! Recently, Pond’s Champion was given and contests. This, plus excerpts from Wal­ seen with a 1/2A Texaco version of the to Dave Lewis, SAM 21 Prexy, to get some ter’s latest newsletter, should suffice for a Playboy Sr., is a happy and satisfied mod­ Texaco flying experience. As can be seen report on SAM 39 doings. eler with this model. You can just see the in Photo No. 2, Dave has done a complete First off, we would like to feature a pleasure emanating from Joe. As the Aus­ refinishing and recovering job. Putting in a couple of photos of Joe Elgin that we tralians would say, “ Good on you.” Super Tigre .60 on glow was the major promised you. Photo No. 3 is an excellent This report wouldn’t be complete unless change, with the result that Dave has al­ shot taken of Joe admiring Tom McCoy’s we featured a photo of Robert "Bucky” ways placed. version of the Cabin Playboy. McCoy’s Walter, 5807 Cambridge Circle, Sandusky, PLAYBOY REVISITED & SAM 39 models can always be identified by the Ohio 44870. Bucky blames his long silence In the last column we wrote an article yellow covering with blue fuselage nose on retirement. . . can you beat that? Here’s featuring Joe Elgin, and were unable at the and black and white striping. what Walter has to say: time to come up with the desired pictures. Inasmuch as Joe Elgin stated the cabin “ I read in the SAM 49 newsletter that Since then, Art Grosheider, newsletter version was an afterthought on the original you are having some troubles with your editor for SAM 1, has come up with several plans, there is some variance in the idea of health. I hope and pray you are feeling good photos. exactly what the cabin looks like. The better by the time you read this letter. I Just about the same time, Bucky Walter sketch of the model shows a tapered rear have been putting off writing you with of SAM 39 sent in a series of photos taken cabin that fairs to a point. My Playboy is news from SAM 39. No excuses. last year of various SAM 39 competitors built this way. The second version had the “ I made the grave error in going back to

32 MODEL BUILDER 5. Bucky Walter releases his Class A-B Bomber tor an official at the 1988 4. Nothing but fun for Joe Elgin, with 1/2A Texaco version of his Playboy. SAM Champs. work. My good friend and modeling Kusak, holding the model. Thad was the Dave told Chet this would be fine but pay buddy. Jack Ross, asked me to go to work SAM 39 High Point man for the year. No your own way! for him. Seems like his company was as­ mean accomplishment as the competition Ah, such is fleeting fame in this modeling signed the job of reactivating the systems in this club is pretty fierce. game! required to operate the biggest vacuum In his newsletter, Bucky reports that ENGINE OF THE MONTH chamber in the world. This chamber took Ralph Turner made a first class boo-boo For this month’s very rare engine, we are 14 months to pump down to the proper when he did not check the direction of his indebted to Wayne Cain of 3308 Pamela operating conditions. Need I say more rudder prior to launch. His beautiful Class Drive, Lorida, Florida 33857 for making the when I say the system had been deactivated C Glow MG went to the left on takeoff. For original pencil drawing of the Nomie en­ for 13 years! correction, Ralph gave right rudder con­ gine, and to George Armstead, 89 Harvest "Finally on Jan. 1, 1989 I retired again trol. This was actually more left with the Lane, Glastonbury, Connecticut 06033 for (much the wiser) and I figure it only took resulting crash breaking the fuselage in a copy of the four-page 1912 Nomie engine me 15 minutes to get back in the swing of half. Bucky says he did the same thing with Co. catalog. Probably the neatest thing about this month's engine is the drawing. Wayne Cain was quite concerned about losing this valuable engine in the mail, so undertook to draw it himself. What a surprise! So, with some rearranging, and inking on mylar, this rotary compressed air engine is pre­ sented for your viewing pleasure. The first item that strikes your attention in the brochure is the statement that this engine will run on carbonic acid (CO 2), compressed air, or steam. In 1912, gas en­ gines, spring motors, and rubber strand motors were not very practical or powerful. Hence, in the Nomie brochure, claims are made for the most powerful engine made to date. As designed by J. deMartino, the Nomie could be supplied with varying numbers of cylinders, as shown in the drawing.

6. Luther Peters readies his Dallaire Sportster while Thad Kusak lends a hand. modeling activity. You might be interested his Lanzo Stick. You have to say "right” and to know I even cleaned up my 57-inch see if you actually have right rudder when wingspan Bomber you told me to clean up you move the transmitter sticks and not at the 1986 SAM Champs.” just see surface movement. Moral: Watch Takes time but they eventually listen to out for those servo reversing switches! their Uncle Jack. The model can be seen in Bucky relates that Chet Lanzo told an Photo No. 5 being launched at the Law- anecdote on himself. Chet got a call from renceville SAM Champs. Model was flown Dave Platt, who revealed plans to hold a in Class B and C using Forster .29 and .35 contest marking the 50th anniversary of engines. Dick Korda’s win at Chicago. Dave wanted Bucky actually sent in fourteen photos. Chester to call Dick and ask him if he would We have selected the ones that look like go to the contest in his honor with all they will reproduce well. Such is Photo No. expenses paid. Chet called Dick and was 6, showing Luther Peters readying his Dal- refused because of health problems. laire Sportster at a SAM 39 contest held at Chester, on his return call to Platt, said 7. Powerful compressed air rotary engine by Walt Northridgeville, Ohio. Of note is Thad he would be glad to take Korda's place. Winberg. Swings a 20-inch prop!

JULY 1989 33 The particular model we are describing is the Model B, a three-cylinder rotary. These engines came equipped with a 1-1/4 inch diameter steel tube, 12 inches long, weighing roughly 10ounces. According to the brochure, the tube could be recharged for as little as 10c from any soda water vendor. One charge was suitable for oper­ ating the engine for 96 seconds at a maxi­ mum pressure of 50 pounds. Naturally, the type B and C motors required larger tubes at twice the capacity of the A tube. The Nomie motor is quite similar to the 8. Gaggle ot C/L biplanes taken to 1947 Nats in Minneapolis by Bob Kennedy and Brad Shepherd. old WWI rotary engines in that the crank­ First Nats after WWII. shaft is stationary while the cylinders and crankcase revolve. Claims were made that this reduced vibration to a minimum, as neither the cylinders nor the pistons have any reciprocating motion, but simply re­ volve each about a separate center. Thus, the motions of both are continuous, much like a turbine. It is interesting to note the illustrations of the engines show the six- cylinder version running clockwise while the three-cylinder model is counter­ clockwise. The crankshaft is hollowed and ma­ chined from tool steel to form the conduit through which the gas is brought to the cylinders. After passing through the shaft, the gas enters the rotary tapered bronze distributing valve. This valve is provided with suitable openings for the gas to enter the respective cylinders. This valve also acts as an exhaust port which allows the gas to escape into the crankcase. Under this sys­ 9. Three Orwick powered "Madman” models by J.C. Yates at the '47 Nationals for the Stunt event. tem, the moving parts disperse the spent from an aluminum casting divided into two Connecting rods are drop forged nickel gas without back pressure. bolted sections. Cylinders are made from steel fitted with bronze bearings. The pis­ Oiling the engine is accomplished by phosphor bronze, machined and ground. tons are made from McAdmite, a light­ putting a few drops of good oil in the Each cylinder is threaded and screwed into weight metal, ground, polished, and fitted hollow shaft. The pressurized gas in the the crankcase. Cylinder heads are alumi­ with compression washers that absorb oil. shaft then forces the oil into the cylinders. num alloy and screwed into the cylinders. Finally, the main crankshaft housing is For the benefit of the technically The engines came highly polished with fitted with a ball thrust bearing and special minded, the Nomie crankcase is made nickel plated parts. collar to prevent excess wear of the rotary valve. Made by the Nomie Engine Co., Ltd., 52nd Ave. and 22nd St., Cicero, Illinois, all engines were guaranteed to run, being tested first with steam at 50,80, and 100 psi and finally with carbon dioxide gas. All

10. Never saw him this happy when flying R/C Scale. Oave Platt at SAM 46 November Annual. Elfin 2.49 diesel.

34 MODEL BUILDER horsepower ratings were guaranteed. Prices on the Nomie engines, complete with tube, ranged from $12.00 for the Type A to $42.00 for the Type D, the eight- cylinder model. MORE COMPRESSED AIR (ANOTHER ROTARY!) Finally found a slot for this letter dated 1976 and forwarded to this writer recently. Photo No. 7 shows the latest creation by Walt Winberg, 938 Gormond Rd., Rich­ mond, B.C. V7E 1N5, Canada. This engine was designed to look as realistic as possible in an effort to get it out of the standard brass-tube-and-solder appearance of the usual compressed air engine. This engine, with a bore of 15/32 inches and a 1/2-inch stroke, uses a master rod setup similar to full-size practice. Special side porting allows the pistons to come as close as possible to the top of the stroke with considerable saving in intake pipe length. The engine features an oil tank mounted 11. Old Timer Elmer Wassam starts up Ohlsson .60 in his Comet Sailplane. Good combination!

12. Scaled up 6-foot Bay Ridge Diamond Demon by Aussie Gordon Bur- ford, with (natch) special Burford .21 diesel. 13. (right) Beautiful framework of Swedish "Balder" glider, by Sven-Olov Linden. Held by his wife, Violet. on the intake shaft. A metering valve allows for a compressed air motor! in an effort to found a Euro-SAM Society. oil to flow to the engine. This is turned on DEUTSCHLAND O.T. GLIDER For further information, contact Fried- just before the air valve is opened, meter­ Received a notice from Friedhelm Mink helm Mink, BRD-5778 Meschede 12, Im ing about 1.5cc of oil per minute; this being via Jim Adams, SAM Prexy, announcing Wiessengrund 9, Germany. dependent on the weight of the oil and the “ Grosse Rhon” contest to be held from 40 YEARS AGO, I WAS . .. the temperature. Walt reports this is just August 5 to 13. This soaring glider meet will Maybe we should title this section “ Back like a true rotary as the engine slings a fine be held in much the same style as took in ’77,” as this is when a letter was written mist of oil while running. One soon dis­ place on the Wasserkuppe in the late thir­ by Brad Shepherd to Bill Northrop. Even­ covers this if standing behind the engine! ties and forties. tually his letter got forwarded (10 years This latest engine weighs 3.45 ounces Also, at this time, a meeting is planned to later) but it still has some good remem­ and swings a 20-inch propeller. Impressive organize the European antique modelers brances in it that should tickle the old memory. Brad Shepherd, whose last address was 1300 E. Polk, Victoria, Texas 77901, writes to say that "Seeing J.C. ‘Madman’ Yates in a recent Model Builder photo brought back the memories of the 1947 Nationals in Minnesota. I lived it all over again with very pleasant memories." Brad submits Photo No. 8 which shows six biplanes that he and Bob Kennedy took to the Nationals from Corpus Christi. Brad continues, "I was still in the Navy and Bob was a draftsman for the O&R on the base. Believe it or not, these little ‘twingers’ have Super Cyclones on ignition in them. We thought they were real hot stuff until we got to Minneapolis. Then we saw ‘JC’ and the Orwick pow­ ered jewel flying on 80-foot lines, the lines looking like they were bowed in a half­ 14. Mickey DeAngelis has flown this 108-Inch version of his "Miss Fortune X” for past three years. circle. I'll never forget watching Yates Powered by an Enya .60 four-cycle. completely relaxed and wringing the

JULY 1989 35 36 FULL-SIZE PLANS AVAILABLE - SEE PAGE 106 MODELBUILDER model out in the pattern series of maneuvers. "I took a picture of his three Madman designs (Photo No. 9) just to remember this incident. Bob and I felt like putting our models back in the car after watching the ‘big boys’ but decided to give it a try any­ way. I have a ninth place medal in Open Stunt from that meet and I am as proud of that award as I am of any other trophy won since. "Other things that I can remember from the first postwar Nationals was how the California boys arrived in the Ohlsson & Rice DC-3, what style! Seeing Claude Mc­ Cullough’s free flight models; in short, things of beauty. And finally, if I am not senile, the Good brothers had their big R/C ‘Guff’ there. A great meet for memories." NEW SAM CHAPTER Nothing like a field to bring the modelers out of the woodwork! Jack Bolton (former SAM Eastern VP) announces the formation 15. John Delagrange did a gorgeous construction Job on his "Miss Fortune." This is an earlier of a new SAM Chapter known as CAAMA version with lower thrust line. (Capitol Area Antique Modelers Associa­ tion), or SAM 10. Jack is real excited about the free flight field they have been able to obtain; a three-quarter-mile square area with “good fallout” on all sides. Best part of all, the field is located near Culpepper, Virginia, an hour away from the Washington D.C. Beltway. The club is very diversified in interests: SAM F/F, AMA F/F, Nostalgia, Rubber, and of course, SAM R/C Old Timers. This has resulted in a membership of 41. To start things off right, Jack announces the First CAAMA Fun Contest on June 3 and 4, at the Club field. No lack of events as there are four SAM F/F events, five SAM R/C events, two AMA Gas, two NFFS Nos­ talgia, two special SAM events (Ohlsson .23 and .020 Replica), plus three rubber events. Whew! To keep things on strictly a fun basis, there will be no entry fees, instead a one­ time $2.00 registration fee will be charged. 16. Charles Buchanan modified and enlarged his TD Coupe to the point that he has renamed it the CB Coupe. Continued on page 81

• Featuring an Old Timer plan in each issue of Model Builder is a tradition that was begun early in the magazine’s history, Trenton Terror and the "Trenton Terror” was one of the first. That was back in November of 1973, or 185 issues ago. Many of you readers have joined us since then, so w e’re re­ printing the plan this month for those who missed it the first time around. The Trenton Terror originally appeared in the April 1938 issue of Flying Aces. Ac­ tually that's not the model’s real name; Mickey DeAngelis, who designed the ship, was a member of the Trenton Gas Model Airplane Club and was himself known as the "Trenton Terror” by his clubmates. When he designed this particular model it was Billy Giblin, who drew the four-page plan for Flying Aces and who has the dis­ tinction of having played one of the Munch kins in The Wizard of Oz, who sug­ gested calling it by its designer’s nickname. Continued on page 84

JULY 1989 37 • An engine is an air pump to which a τ ο ~ π » combustible is added so that mechanical work (like turning a propeller) can be performed. YS has perfected the “ combustible is INSIDE ENGINES added” part to a very high level of satisfac­ tion to R/C fliers. The only further fuel feed advancement will be true mechanical fuel injection—in which a controllable volume of fuel will be injected under ex­ tremely high pressure directly into the combustion chamber for each firing cycle. WITH STU RICHMOND WWII’s Messerschmitt Me-109 fighters had fuel injection—they could quickly dive in combat by simply pushing the stick for­ ward. Spitfire engines had common down- draft carburetion and had to do a half roll and pull on the stick to dive or their en­ SUPERCHARGED FOUR-STROKE gines would starve for fuel. YS makes two-cycle .45s in both side and rear exhaust versions. They also make two- cycle .60s in both side and rear exhaust, in airplane and helicopter versions. All six of these engines use the unique and simple Futoba's VS-120 YS variable pressurization system to pres­ surize the model’s fuel tank to a degree such that fuel is supplied to the engine combustion air with a force above simple normal atmospheric pressure. The in­ creased pressure originates in the YS en­ gine’s crankcase as the piston descends toward bottom dead center (BDC). That pressure below the piston is allowed to travel forward through the crankshaft’s hollow journal and out a surface hole of the journal to exert timed crankcase pres­ sure downward on the top side of the pressure regulator’s diaphragm. The regu­ lator’s spring sets the pressure level. The pressure then is released through a one­ way external check valve into the fuel tank where it forces fuel to the engine at a steady pressure through a one-way check valve in the regulator—past the needle valve—and into the engine’s air intake for combustion. A simplified example of this can be seen on any of the Cox TD engines, which have a small nipple molded into the plastic carburetor section on the right side; if you drill through the plastic at the bottom of the nipple it gives access to timed crank­ case pressure. The YS pressurized fuel system works so well and gives such steady engine runs that Just to the right of the one-inch ruler is the casting that houses the pressure fuel regulator system. thirteen of the top sixteen Masters Class Text explains its operation. Engine’s castings and machine work are excellent. Pattern fliers at the '88 Nats used YS en-

With the valve cover removed we see the straightforward mechanics for These tew parts are the heart of the YS-120’s pressurized fuel system. operating the valves. Design is simple and works beautifully.

38 MODEL BUILDER Double-barrel carb draws combustion air down through the right hole, The YS-120's tuel/air system works so well that the Quarter Scale Pylon through the crankcase and back up through the Intake pipe on the lett. Racing Association has banned its usel Text tells why.

PROP SIZE LOW SPEED HIGH SPEED SPEED RATIO 13x6 2,000 11,700 5.85:1 13x8 2,000 11,250 5.63:1 14x8 1,900 9,750 5.13:1 15x8 1,800 9,300 5.17:1 16x8 1,750 7,250 4.14:1 125x11.5* 2,150 8,650 4.02:1

•This is an Australian Bolly three- blade Pattern prop. All others are pressed air enters the combustion chamber black Master Airscrews. carrying more oxygen, and more power A speed ratio below 4:1 is unsatis­ results. Turbosuperchargers (or turbos) are factory. air pumps driven from hot escaping ex­ A speed ratio of 4:1 is barely satis­ haust gases rather than from the crankshaft, factory. and rotational speeds are still higher, as are A speed ratio of 5:1 is average. efficiencies. (I recently drove an older A speed ratio of 6:1 is excellent. Dodge Colt Turbo through the North A speed ratio above 6:1 is superb Alabama mountains. The car’s per­ Wlth the carb removed you can see how com­ performance. formance was unimpressive but when you bustion air flows through the crankcase to keep it stomped down on the gas pedal hard, the purged. Fuel/alr flow is completely unique exhaust was diverted to the turbine com- among (our-cycle engines. Hold just below the waiting chamber. When the intake valve pressor—you could audibly hear it spool- bottom cooling fin is for removing the wrist pin. opens, both of these charges enter the up like a jet airliner at takeoff—and when gines! Needless to say, the rest of the en­ combustion chamber. I don’t regard these the system started pumping compressed gine works as well as the pressurization dual intakes as “supercharging” in the air into the Colt's carburetor and cylinders, system does! conventional sense. Superchargers are two or three seconds later you got an ex­ When YSdecided to build a 120size (1.2 usually very small volume high-speed im­ hilarating push on your backside that ac- cubic inch or 20 cubic centimeters dis­ peller type air pumps that are driven by the placement) four-stroke engine for F3A engine’s crankshaft. The pumped, com­ Continued on page 80 world class Pattern flying, for scale, and for Sunday sport flying, they cleverly devised a rear rotary valve air induction system since their highly successful timed-crankcase- pressure-fed-to-the-fuel-tank system re­ quires a sealed crankcase in order to work. On a two-cycle engine the pressure that builds up below the piston is mostly used to pump the fuel and combustion air up the bypass ports into the combustion chamber—before the piston rises high enough to close the combustion cham­ ber—and before compression and com­ bustion occur. The Futaba YS-120 uses its rear rotary intake disc to mostly seal the crankcase on the piston's “down” stroke (so the pressure system will work) and to mostly open the crankcase on the piston's "up" stroke to readily draw in fresh combustion air. But since this is a four-stroke engine there are two intake-through-the-disc air move­ ments to each opening of the engine’s intake valve. In effect, the first intake of air (and fuel) waits sealed in the intake tube and carburetor area while a second intake Futaba’s YS-120 four-stroke Is normally available wherever their radios are sold. Engine comes with is made and is also released into the same all of the tools shown plus a one-way check valve for the pressure line.

JULY 1989 39 brush turns around 180 degrees, and put it back in the same brush holder it came out of. If the motor is the "can” style, the brushes are not removable, so do a motor break-in for the new direction before you go fly. Timing adds a new dimension. You must check the timing to see which direction the motor is timed for. This is easy to do, as shown in the sketch. Draw a line from brush to brush. Now draw a line 90degrees (perpendicular) to it, using the motor shaft as center. This is your backplate reference line. Now draw a line from motor mount­ ing hole to motor mounting hole in the front of the motor. Some motors have a • Motor timing has become a hot issue in forward means the motor shaft is turning pair of holes; draw the line between the stock off-road R/C car racing. Most aircraft clockwise when viewing the motor from pairs. This is the magnet reference line. It motors are set at zero timing, so the subject the back. This is correct for conventional runs between the magnet pairs. Now check may not seem to apply to airplanes. This propellers. If a belt drive is used, the situa­ the relationship between the backplate will not stay so! The Astro cobalt motors tion is still the same. If a gear drive using a and magnet reference lines. I check this by have adjustable timing, and now the Lei­ pinion and drive gear is used, the motor looking at the backplate, that is, looking sure 100 watt (05) motors do too. The Lei­ must turn counterclockwise as viewed from back to front on the motor. If the sure motors are very impressive, the best from the back so the prop will be turning backplate is rotated counterclockwise to 100 watt ferrite motors I have seen, and conventionally. So, gear drive is "back­ the magnet line, the motor is timed for they are most surely the leading edge of wards” for the motor as compared to direct direct drive. All the off-road stock car motors are timed in this direction. The general rule as viewed from the back of the motor is as follows: the backplate is rotated opposite to the direction of the motor rotation. Now you can measure the timing angle. Use a protractor to measure the angle between the brush line and the magnet line; this is the timing angle. Timing angles up to and including 15 degrees are com­ mon. The timing angle can go as high as 20 degrees, but the motor will be drawing so much current that its life will be short. As the timing angle goes up, the rpm goes up. Past 20 degrees, the rpm drops again. If you rotate the backplate 180 degrees, the motor reverses. This is one way you can Twin Astro 05 cobalts provide plenty of motive power for John Mountjoy's Partenavia P-68. Could make the motor go in reverse without this be the only scale electric twin available in kit form? what will be the standard in the future. So, drive. HOW TIM ING A N G LE let’s take a look at timing. When a motor is broken in, the brushes IS MEASURED This column was inspired partly because tend to feather in the direction of rotation. of the Leisure motors, and partly from a If the motor is then run in the opposite postcard from Bill Baker. Bill knows his direction the edges of the feather area can stuff; he put out an independent newslet­ and sometimes do break off, which results ter, the Okie F/F News until recently, and in some rough running for awhile until the is now writing the Old Timer F/F column brushes break in again. The symptoms of for Model Aviation. His question was: rough running are lots of arcing or spark­ "Should all motors be run in backwards for ing, pitting and/or discoloration of the break-in, or just car motors?” commutator, power/rpm loss, radio in­ The catch here is that motors can run terference, and heat. If the motor has re­ either way. Backwards is then just a word movable brushes and you are changing for “ it turns the opposite way to what I am from direct to gear drive or vice versa, just used to." I fly mostly direct drive, so to me, pull out the brushes, twist the pigtail so the

HOW TIMING ANGLE AFFECTS MOTOR PERFORMANCE

LeMans 360 motor, 6x3 Graupner prop 6 cell Panasonic Eliminator 1200 mAh pack

Degrees No Load Amp Prop Amp RPM Efficiency 0 1.5 16 14,700 66.3% 5 2.5 14 14,900 79.6% i o 2.5 17 15,300 71.2% 9 0 ° to magnet line) 15 3.0 19 15,800 71.0% 17.5 4.0 23 15,900 60.4% — Magnet line (center on 20 8.0 Not Run motor mount bolt holes) 30 30.0 Not Run

40 MODELBUILDER changing leads! So, at last, the answer to Bill’s question! Break in the motor in the direction it will be going when used in flight. Usually this will be clockwise for direct drive and counterclockwise for gear drive, as viewed from the back of the motor. Car racers often modify stock motors that have replaceable brushes. Mabuchi style "can” motors can be modified too, but it takes more work. The Yokomo style motors (replaceable brushes) have light­ weight tabs holding the backplate in place. It is easy to lift them up with a screwdriver. Some car racers just grab the motor, drive shaft pointing down, and whack it shaft- down on a hard surface; this pops the tabs open. The backplate can then be rotated. You can drill a couple of small holes in the case at the back for screws to hold the backplate on. The car racers usually replace the sintered bronze bearings with ball bearings while they are at it. These are 1/8-inch I.D. bearings, which are often The standard speed reduction gearbox from Leisure Electronics has been improved by going to a available at the hobby stores that stock larger diameter shaft, bigger bearings and a tougher material for the big gear. off-road cars, or from the off-road manufacturers. Let's take a detailed look at the effects of timing angle on the power and efficiency of a 100 watt motor. I ran tests on a LeMans Kyosho 360 motor at a series of timing angles. The accompanying table shows the results. Efficiency was calculated using watts in equals volts times current; watts out equals pitch times diameter to the fourth power times rpm cubed times 5.33 times ten to the minus 15 power (as per the article in the July ’88 Model Aviation). The data shows some interesting results. Note that even though the no-load current Also from Leisure is the new extended gearbox designed specifically for electric sailplanes. Available goes up, the efficiency of the motor goes with three different gear ratios and with three different motors. Details in text. up even more. Note the incredible 13% that motors that measure 15 degrees may are two gearbox styles available, long and jump in efficiency with a timing change of be advertised as thirty degrees, and so on. short. The photo shows the long housing. only five degrees! Any time you can get a Note that the LeMans 360 motor was draw­ This is for sailplanes, and it allows a longer gain like that, it is worth doing! If you are ing 30 amps with no load at an actual 30 nose to accommodate folding props. The after power gain, the 15 degree timing degrees! housing looks like it is the same type of angle gives an output power gain of 24% Now for the other item that inspired this glass filled nylon that is used for gas engine with no loss in efficiency compared to zero column. Leisure Electronics sent me a sam­ mounts—very tough indeed. The output degrees. So, take your pick, high efficiency ple of their new sailplane motor and gear­ shaft is a hefty 3/16-inch diameter. This at 5 degrees or high power at 15 degrees. box, and I am very impressed. I have not shaft is unlikely to break or bend. Ball I have seen many off-road motors la­ had a chance to go out and fly it yet (it is bearings are used front and rear. The drive beled as 20 to 30 degree timing. When March and there is six inches of snow on gear is nylon, the pinion gear is brass. It all measured with a protractor, I get half that. the ground!), but technically it is better looks very sturdy. I have only two things I Perhaps the manufacturers are adding the than any 100 watt ferrite aircraft motor I would like to see. One is a removable pin- degrees for each brush. Why they would have seen, and the gearbox is better than do that is mystifying to me. So, be aware any I have seen with plastic housings. There Continued on page 73

Two 020/035 size electrics belonging to Jack Dobbins are a converted R/C hand-launch glider (left) from RCM plans, and a scaled down Ken Willard "Showmaster." Both use a Kyosho AP29R power system.

JULY 1989 41 found in the U.S. for around $150 is selling for AUSS305 or U.S.$386 when you allow A L L A B O U T for the conversion, and EZ's Dago Red was supposedly a bargain in Australia for a mere AUS$395, or U.S.S500 at the time. In the U.S. Dago Reds go for around $230! So you can see that kits and accessories (radios, too) are around two or three times more ARFS expensive in Australia than they are here. By ART STEINBERG "So after arriving in the U.S., I started looking around for a model to start flying. The new England winter was almost upon • A great deal of the enjoyment I derive “ I have been following the ARFs column us when we arrived late in October so an from my R/C flying activities comes from with interest for a while now, but until ARF made sense as the quickest way to get the privilege of writing this column each recently I had not had the opportunity to into the air. The other factor that came into month. By doing so I get to handle many try out one of these new-fangled Mec­ play was that we are here temporarily, and new products and those of you who regu­ cano-set models. You see, two months ago therefore we are living in an apartment larly read these pages know that we are I moved from Melbourne, Australia, to the without the ‘model room’ I was used to at usually examining, testing, and discussing U.S. for work (I’m a computer-aided design home and without a garage or backyard some new innovation brought out by the engineer for GE Plastics). Back home, for breaking in and running an oily and ARF industry. I wish I were at liberty to building model aircraft can be an expen­ noisy piston engine. So an electric ARF mention some of the specific things that sive hobby if you let it. Anything imported would be ideal. I ended up choosing Kyo- are in the works for future columns, but from the U.S. or Japan has its price inflated sho’s Express for the above reasons, and I for the time being I am obligated to keep by one or two middlemen, then import thought you may be interested in my im­ mum about what we have in store for our duties, sales tax, and finally the conversion pressions. I’m also trying to find some info loyal readers. Suffice it to say that one or between the Aussie dollar and the yen or about the model, but more on that later. two of our forthcoming product reports the U.S. dollar. Thus any ARF kits are gen­ "The Express is Kyosho’s most recent will really move you! And besides getting erally very pricey. A couple of examples: ARF motorized glider. A number of maga­ in on the ground floor of so many fasci­ the Kyosho Flash electric kit which can be zine writers have already noted its resem- nating R/C ARF developments, another one of my invaluable benefits is that I get to make so many good friends along the way. It’s difficult to believe that this column is halfway through its second year of publi­ cation. From the voluminous mail I’ve been receiving, interest in ARFs is absolutely exploding. Much of this correspondence is of great general interest, and this month I will share some of it with you. From Springfield, Massachusetts we hear from Derek Buckmaster, an Aussie who is pre­ sently residing in the States. Derek is an old hand at writing for R/C publications, as he has authored a couple of kit reviews for Airborne, the model magazine published "down under,” and he’s had one of his own designs published too. His letter is in A handsome pair of Challenge II ARFs originally marketed by World Engines—check with W.E. for the form of an ARF kit review and he availability. Rick Radclilfe's, on the left, flies with an Enya 120R, while Sal Lucianla uses an O.S. .90 in writes: his.

The Kyosho “Express" ARF is actually a semi-scale model of the Taifun 17-E motorglider built In Germany. This is an electric powered model using Kyosho's AP29R motor on six cells. Ship comes equipped with the Auto Cut-Off described in "Over the Counter" this month.

42 MODEL BUILDER This month's column contains a review ot the Express by Derek Buck Underside view of the Express shows the landing gear attachment and master, an Aussie modeler temporarily living in the U.S. wing rudder bands. blance to the Valencia kit, even suggesting that it is simply a smaller, tricycle-geared version of the Valencia. Somehow I like to think that it is a little more than that. In several places on the box and in Kyosho’s advertising, the Express is described as be­ ing 1/11 scale, but nowhere is the identity of the full-scale craft made clear. A little research shows that the Express is fash­ ioned after the German Taifun 17-E motor- glider. Cox also has a larger kit of the Taifun on the market. This also explains the Ger­ man registration letters D-KONO on the Here's a hot combination: Royal's Telstar and a pumped S.T. .45 with MAC tuned pipe. This one by fuselage of the Express. This is where my Ben McMIchael is a lively performer. plea for information comes in. I am looking the order of the day. The fuselage is very tween the edge of a table and a steel for some more documentation on the Tai­ tough, but also a little flexible. Whenever straightedge with the hinge line directly fun. I brought no books across from home you pick up the model, the fuselage over the edge of the table. The tailplane is at all, and my references on motorgliders squashes in by half an inch or so on each connected to the top of the rudder with are rather sparse in any case. So I would side. This takes a little while to get used to! two plastic brackets which allow the tail- really appreciate it if you or a reader may However, the fuselage molding is very rigid plane to be removed for transport. Two know of any Taifun details or where to find in torsion and resists any lengthwise long bolts protrude from the bottom of them. One source I intend to try is the bending. the rudder, and these hold the whole em­ scale documentation mail-order type "All of the tail surfaces are molded in pennage onto the fuselage, fixed with plas­ places, but often they do not feature rarer higher than normal density expanded poly­ tic nuts on the underside of the fuselage. or European types. styrene foam, featuring a hard, shiny sur­ The elevator is actuated by a Bowden cable "On to some details of the kit. The model face. The rudder and fin are one piece, which runs inside the tail fin, and the rud­ features Kyosho’s latest materials tech­ with a thin integrally-molded hinge in der is actuated by a wire pushrod. nology. The fuselage is a one-piece blow between. Elevator and tailplane treatment "The wings are made from a top and molded affair, which I understand is is the same. These hinges are quite stiff bottom layer of styrofoam, with a core molded from a polyolefin resin, resulting when taken out of the box and must be which extends for about a quarter of the in a waxy surface. Of course nothing at all ‘exercised’ to free them up and reduce span out each wing from the root. This will stick to this material, so everything is servo loads. I found that the easiest way to fastened mechanically; screws or bolts are do this was to sandwich the elevator be­ Continued on page 70

Above: not commonly seen in the U.S., the Striker is a 62-inch ARF produced in England. This one by Sal Luciania files well with an O.S. .61 SF ABC. Left: a .60 two-stroke In a Royal Chipmunk 40 is a real handlul! George Wright goes for spectacular performance in his models.

JULY 1989 43 "Those of us who learned the old simple ways have stuck with aeromodeling all these years because we found that the basics have transcended and outlasted all the new and changing fads."

John Worth Close-up of custom-made CO 2 engine by Stefan Gasparin, mounted In Lacey built by Frantlsek RELIABLE RUBBER POWER model must climb under its own power Barta. Photo by M. Gasparin. Rubber is the oldest and simplest form after launch to register an official flight. No By the end of the flying session, Phillips’ of model power, other than gravity. Even limit on attempts. Best duration wins. What model had attained 24.1 seconds duration, in the “ High-tech Eighties” it remains effi­ could be simpler? and Reid Hull’s had managed a respectable cient and popular for models as small as During the first meeting, four models 17.1 seconds. Pistachios and as large as Jumbos. appeared. Bill Hadden's two semi-scale Phillips also flew a semi-scalish Boeing The Don Ross book. Rubber Powered entries (one with twin ducts) proved too 727-200 with a propeller, unconventional Model Airplanes is selling briskly, and not heavy to achieve official flights, however in having transparent blades which became only to beginners, but also to many ex­ were inspirational anyhow. nearly invisible in flight. Spanning 16 perienced builders. Is this a sign of yearn­ Next to try was Reid Hull, who employed inches, the 22-inch long model has also ing for “days of yore” nostalgia? Or do a carved two-blade impeller running in flown with the prop mounted in the pusher rubber-powered models offer a relaxing front of an oppositely-pitched stator in a position. If any of our readers are looking change-of-pace from long-term compli­ stick-and-tissue duct with a styrofoam inlet. for a fresh challenge, try rubber-powered cated projects? Whatever the reasons, we On the first attempt the model climbed jets! congratulate author Don Ross and artist away and flew well while the audience RUBBER-POWERED B-36 Jim Kaman on their winning combination! cheered! It soon hit a wall, but it had gained Dr. Bill Harris has been developing RUBBER-POWERED JETS? several feet of altitude, showing unex­ multi-engine models employing light­ Among the advantages of "rubber jobs” pected promise. weight gears of his own manufacture. Be­ is the ease with which experiments may be Then Hewitt Phillips’ model, featuring ginning with a simple non-scale twin-prop conducted. A case-in-point concerns an impeller at each end of its duct, amazed "test bed,” he progressed through a model jet planes. Ducted fans are hot items the crowd by performing a takeoff, and Northrop P-61 Black Widow, and even­ in R/C, of course, however they are now being "the slowest jet plane you will ever tually a six-prop Convair B-36. We enjoyed gaining fresh attention among free flight- see,” according to its builder. (How about his description of the testing difficulties: ers. Emmanuel Fillon’s rubber-driven the Harrier, Hewitt?) “The B-36 flew before I painted it and squirrel-cage-blower powered models have appeared in this column previously, β and we well recall Jon Hoshisaki's Mig-like sport model flown many years ago at Sepulveda Basin. Now modelers in Cali­ fornia and Virginia are experimenting with the jets, and thanks to Tom Arnold, Hewitt Phillips and Bill Hadden we have a few tantalizing details. On the West Coast, Barnaby Wainfan has a delta-winged model propelled by a Sleek Streak plastic prop running inside a 15-inch long duct, making circuits inside a gymnasium. In San Diego, Roy Hood has constructed an all­ balsa, rubber-driven, seven-stage axial- flow turbine. Although unsuccessful thus far, it may inspire additional exploration. In the east, Reid Hull and Hewitt Phillips, partially inspired by Jurgen Korteback’s A- 10 Peanut, have developed the ducted-fan sport models shown in our photos. Their Virginia Brainbusters model club proposed simple rules: 3-inch maximum impeller diameter, 6-inch minimum duct length, World's smallest C O 2 powered free flight, a Pistachio Scale Lacey M-10 by Frantlsek Barta, and 18-inch maximum wing span. The Czechoslovakia. Photo by Michal Gasparin.

44 MODEL BUILDER International Reply Coupons (from your post office) to: Shoichi Uchida, 3-24 Asa- τ \ naka, Ogaki-shi, Gifu-ken, 503 JAPAN. Λ AND IN BELGIUM The 13th Annual Club de Petite Aviation indoor championships features many prize categories, and also solicits Peanut and Pistachio proxy entries for those unable to attend in person. The dates are August 25, 26 and 27, and complete rules and entry forms are available by sending four Inter­ national Reply Coupons to: F.L. Van Hau- waert, Grand Place I - Box 52,4110 Flemalle, BELGIUM. AND IN THE U.S. A tidy Tipsy Junior Peanut by Clarence Mather, Bishop, California. As you might expect trom The 1989 contest calendar is unusually Clarence, it's an outstanding flyer. enticing. The National Free Flight Society added 25 grams of details. Since the only flying field is 20 miles away, and since the wind only quits on alternate leap-years, it may be some time before the feasibility of six props running off one rubber motor can be demonstrated.” FLYING HAT? During last year’s Pasadena IMS show, Doug Gardner, of Covina, California, at­ tracted a great deal of attention with his Pistachio-sized Hergt monoplane mounted atop his hat. He related that dozens of curious people stopped him to ask if it really flew. (Yes, up to 45 seconds. . . with­ out the hat, of course.) Among those who talked to Doug was a gentleman who wanted to purchase it, offering two fifty- dollar bills right then and there! No, Doug didn’t sell, and he explained the reason for An "almost profile" Boeing 727-200 with transparent propeller, as described in article. Photo by wearing the unusual chapeau: "I feel I must Hewitt Phillips. actively promote our hobby, and although Builder magazine prominently on view in sewing a model plane to your hat might one showcase! Modelers Shoichi Uchida, seem silly, it just might help save us a “ Kaz” Suzuki and Jiro Sugimoto were in­ flying-field somewhere down the road.” terviewed on local television and did some PEANUTS ON PARADE Peanut flying for the cameras as well. During late 1988, the Japanese Shonai The Nagoya club will again sponsor an Peanut Powers Club organized a most suc­ international Peanut Postal Proxy contest, cessful model display in the Nagoya Ueda and mailed-in entries are invited. Based Dome Plaza. Sponsors were enlisted and upon previous events, entries from at least lavish full-color posters promoting the six different countries may be expected. event were published. Hundreds of models Scheduled for August 13,14 and 15th, en­ were displayed in a gallery-like atmos­ tries must be received no later than July 30, phere, and we were pleased to note Model 1989. For entry forms and rules, send four

Reid Hull’s ducted-fan rubber model (yes, ducted-fan) approaches rafters during Brain- busters’ indoor meet. Bill Hadden pic. U.S. Indoor Championships in the Johnson City, Tennessee Mini-Dome (116 feet high!) is scheduled for June 1, 2, 3 and 4, with over 20 separate events, including the MIAMA Peanut Gran Prix. For more in­ formation send a stamped self-addressed return envelope to: USIC, 1655 Revere Drive, Brookfield, Wisconsin 53005. Then on June 19 through 23, the NFFS Outdoor Championships takes place in Lawrenceville, Illinois, with practically every free flight event one can imagine. Entry forms may be obtained by sending a stamped, self-addressed return envelope to: R. Smith,7552Redondo Ct.,Cincinnati, Ohio 45243. The AMA Nationals in the Washington Tri-Cities area plus Moscow, Hewitt Phillips (left) and Reid Hull with their successful indoor ducted-fan models at Brainbusters' meet. Photo by Bill Hadden. Continued on page 66

JULY 1989 4 5 STINSON MODEL "IT • Stinson’s Model “ U” , produced from overall length of 33.75 inches. This works 1931 to 1933, was the last in their series of By MIKE KEVILLE... Half-A out to a scale of 3/4 inch = 1 foot, or 1/16th tri-motored, high-wing airliners. Spanning Profile Scale is an event that full size. 66 feet 2 inches, and powered by three A word about power. You could modify 240-hp Lycomings, the "U ” featured many is rapidly gaining in popular­ things and use beam-mounted engines, advanced items for its day, and sold new ity. Our author’s three-en­ such as Cox Medallions, WenMacs or OK for $27,000 . . . about the cost of an R/C gine 1930s airliner offers a Cubs. (If you have Cubs for sale, we need Giant Scale ship today, we’d reckon. Flown to talk.) Or, with some changes, center the by American Airways, forerunner of to­ good introduction to the Babe Bees. Being basically lazy, and in view day’s American Airlines, most model ver­ event and to multi-engine of the vertical needle valves required, we sions seem to be trimmed in that livery, C/L models in general. mounted them off-center. Up close, we’ll and this one’s no exception. admit it looks sort of tacky—but in flight it’s Longtime readers may recall Don But­ no big deal. Ample, but not outrageous, man’s Peanut Scale version in the April '74 version. power is provided by 6x3 props and 25% issue of Model Builder. Dave Shipton, of Several members of our club, Southern nitro fuel. Delavan, Illinois, had a gorgeous C/L ‘‘U’’ California’s “ Knights of the Round Circle,’’ Construction of this little airliner is fairly at the '66 Glenview Nats. An .010-powered suggested we try to get this thing pub­ standard, so we’ll just try to highlight any free flight rendition was once built and lished. We immediately chose MB with its unusual features. It’s helpful to "kit” and flown (!) by Bill Stroman. And now . . . for much-appreciated equal billing of C/L and prefabricate as much as possible, as this what it’s worth, the Half-A Profile Scale F/F. The Editor/Publisher has been a friend seems to speed assembly somewhat and

Gorgeous lull-fuselage C/L Stinson built by Hobby Hideaway's Dave Shipton over 20 years ago. Dave originally flew it with three Arden .09s, now has three dummy Lycomings lor static display. through the years, offering us a sincere allows plenty of time for the fun (?) of "welcome back” after a long absence from painting and decorating. modeling. The guy is down-to-earth; de­ MAIN WING spite being an AMA Hall-of-Famer and all- Sliced ribs (64 of ’em) were used for around big-timer, he’s managed to main­ lightness and to avoid having to cut all tain the same hat size, if you know what we those holes for the buried spars. You’ll also mean. save a bundle of bucks on balsa this way. For scale data and 3-views, we contacted Use a template of 1/16 ply for the top rib Dave Shipton. To our delight, he re­ pieces, and go to it. Rib bottoms are lengths sponded by sending his 22-year-old Nats of 1/8 sq. stock. Mike did a fine job on the model Stinson but it still presentation booklet, containing Wylam If you can’t readily locate any light-but- looks pretty sick compared to his daughter, drawings and copies from the pages of an firm 3/4x1 balsa for the L.E., trim some Michele. At 13 years ot age, she is already a competent C/L flier. Mike says Michele can land old issue of Popular Aviation. We then one-inch square on a scroll saw, which will a C/L model better than he can. We think so enlarged the Wylams four times, which also help ensure straightness. Note the too—we've seen him fly! yielded a wingspan of 50 inches and an slight dihedral in the panels, and allow for

46 MODEL BUILDER Sesquiplane structure needs to be strong to withstand landing shocks. Horizontal stab is a 1/16 balsa core with 1/8 balsa outlines and ribs top and Leading edge is carved from a solid balsa block. bottom. A quick and easy way to simulate a built-up structure. more realistic appearance using four thick­ relocating the engines to the outboard side nesses of 1/32x1/8 basswood soaked in and sticking with the 3/4-ounce weight, or ammonia/water and glued around a form building the model as per the original and of the inside dimension of the tip. (For installingat least 7-7/2 ounces of outboard more information on laminated wingtips, tip weight.) refer to past "F/F Scale” columns by Fer­ We found it helpful to cover and finish nando Ramos.) the wing prior to its installation. If you On rib spacing, note that while most ribs agree, remember to leave about 3/8-inch are 3/4-inch apart, those toward the center of bare wood at the center for adhesive of each panel are spaced at only 5/8-inch. penetration. You may want to reinforce This follows the scale spacing per the the wing/fuselage junction with lengths of Wylam drawings and allows for a some­ 1/8-inch dowel. what stronger strut support area—probably SESQUIPLANE (Lower Wing) Eddie Stinson’s intent in the first place. This unit absorbs a lot of stress. It sup­ The four center ribs (two of 1/8, two of ports the two outboard engines and takes 1/4-inch balsa) are solid, and require spar the landing shock. Although light weight is openings to be cut, including space for the important, think strength here. Don't omit spar joiners. Note that each of these ribs is the dowels, gussets or ply joiners. Select a undercut by 1/16 inch, top and bottom, to length of firm lxl-1/8 inch balsa, mark the accept the center-section sheeting. Dihe­ center and taper it to 3/4-inch square at dral is 3/8-inch at each tip. Carefully block- each tip, with the "sweep” being on both sand to this angle and join the panels with the L.E. and the bottom surface. Ribs are your favorite adhesive, then secure the solid. Note the “ vee" dihedral on the previously-inserted spar doublers and slide under surface and taper the SP-1 rib bot­ the solid ribs into place. Install about 3/4 toms to blend in with this. Rib tops are sliced trom 1/8 sheet, bottoms are ounce of outboard tip weight. Fill in all the Among other things this author can't do 1/8 sq. Not as difficult as it looks. dings, carve and sand everything to final is plot rib patterns. Ribs SP-2 through SP-8 that when installing the center ribs. shape and cover as desired. were eyeballed and trimmed to shape as Spar height and locations aren’t critical; (Editor's note: As shown in the photos things went along—based on SP-1. As such, just be certain they're strong enough to do and on the plan, Mike originally mounted the sesquiplane ribs on the plan are ap­ the job, and that they contact every rib. Do all three engines on the inboard side of the proximate shapes; you’ll have to judge as be sure to install the ply spar joiners and nose and nacelles, in an effort to direct the you go along . . . or perhaps you know balsa gussets. thrust toward the outside of the circle. how to plot tapered ribs properly? Wingtips on the original were cut from However, flight tests have since shown a The 1/4-inch tip ribs (SP-8) are added 3/16 sheet as shown on the plans. While very definite need for increased outboard after the L.E. and T.E. are carved and sanded these don’t look too bad, an alternate tip weight, at least twice the 3/4 ounce method would be to laminate them for a specified above. Mike recommends either Continued on page 79

Fuselage is completely painted and trimmed before final assembly—makes The outboard nacelle, engine mount, landing gear strut, and wheel pant, things a lot easier all around. all ready for painting. JULY 1989 47

"Back in early '87, Mike Fox and Don Repp began local efforts to form a control line club. Several of us saw notices in area hobby shops and did a double-take. "Hey, we thought. " ‘Control line peo­ ple.’ So we called ’e m .. . . BY JOHN THOMPSON “ Early meetings were held in a junior high school in Orange. About ten people CIRCLING THE GLOBE of energetic editors, but they generally showed up and it began to grow. We There’s never been any doubt that for carry the communication load. The news­ moved our meetings to the present loca­ modeling action, the control line circles letters keep local fliers up to date on local tion in late '87, and the roster gets larger. are the place to be. It’s a kind of flying that activities, and the exchange of newsletters C/L is alive and well. In fact, we’ve nearly is often fast and always fascinating, and it’s helps clubs and modeling press people outgrown the present meeting site. Guests close to the fliers and the spectators. stay in tune with the bigger picture. continue to attend, many of whom be­ Recent mail coming into Model Builder With that "connectional” concept in come members. It’s difficult to spend more control line headquarters indicates that the mind, we come to a current success story than a few moments chatting with friends control line circle extends far and wide. from one club, the Knights of the Round and associates at meetings. It’s tough trying Recent news crossing the MB desk comes Circle, whose newsletter, which has been to get a minute alone to welcome the new from places such as Germany, New Zea­ mentioned here previously, is appropri­ folks and gather all the news everyone land, and all over the U.S. New clubs, old ately named Direct Connection. It refers (thankfully) wants to give us for this rag. clubs growing, new contests, and new not only to the network of fliers, but also to "As a special service to our newer products crop up daily. the C/L pilot’s unique direct link to his members, primarily those who aren’t Here are just a few tidbits from the mid­ airplane. competition oriented (or to those just winter mailbag: Editor Mike Keville tells in the February learning to fly), this issue is devoted to SIGNIFICANT 1989 edition how the club quickly grew introducing ourselves to you. Though we We’ll forgive Sig Manufacturing Co. for from a few independent fliers in Southern all look very busy and preoccupied, please their advance advertisement which refers California to a strong, active club: know that we’re here to help. Your mem- to C/L fliers as “ roundy-rounders.” We know they were just kidding, because their new kit is evidence that Sig knows what C/L is all about. The Skyray 35, a 44-inch span profile named after Sig's popular little .049-pow- ered Skyray, is due for release by the time you read this. It's an all-purpose design in the tradition of the old Ringmaster, Flite-Streak, etc., in that it is designed for engines from .19 to .35 and would be suitable for training, in­ termediate level stunt, combat, racing or just Sunday flying. We won’t go into all the minute details, but the Skyray is designed by C/L expert Mike Pratt (designer of the Magnum stunter) and has all the top-quality features of a typical big kit, including that all-im­ portant hardware. Speaking of stunt, this is a good place to pass on a bit of stunt news—about Stunt News. Yes, the publication of the Precision Aerobatics Model Pilots Association has returned to its old name and is under new management. The new address for general PAM PA correspondence is 221 N.W. 2nd Piotr Zawada (arrow), top C/Ler from Poland, at an East Berlin meet. MB has published two of his Ave., Suite 300, Portland, Oregon 97209. To stunt designs. contact Stunt News, write editor Mike Keville at 6618 Dashwood St., Lakewood, California 90713. CONNECTIONS Proud as we are of control line model aviation’s global existence, it's a somewhat specialized activity pursued by enthusiasts who are scattered over wide distances. In order to enjoy the social aspects of our hobby—flying and competing together— there is a need for some kind of "net­ working,” to use the hip term. In model aviation, that usually means a club and/or a newsletter. Indeed, most newsletters are produced by clubs, serving their cities or regions. Some areas have developed independent newsletters, such as the Flying Lines newsletter that origi­ nated in the Northwest for eight years and had nationwide circulation. Newsletters tend to come and go with the availability Group of young stunt fliers from Poznan, Poland, at a Warsaw meet.

50 MODEL BUILDER It pays to bring lots ot ammunition for Combat. Carload ot fast combat The Fox Combat Special Mk VI. ships belonging to Larry Oriskill. Texas. bership is valued, so be sure to ask if you clubs. The clubs are to be listed in the need assistance or info on anything.” National Newsletter, and the local editors Mike then goes on to list the names and can choose from that who they wish to a bit of information about each club exchange with. member—some 40 strong. The National Newsletter, by the way, is a If you happen to be a resident of the publication put together by Academy of area and would like to drop in, the Knights Model Aeronautics mover and shaker, Jim of the Round Circle meet at the Anaheim McNeill, and is mailed to newsletter edi­ Public Library. For information about tors. It contains clippings from many meeting dates, contact Mike at (213) newsletters, intended for reproduction by 804-4056. any editor who finds the material useful. As if designed to fit right in with the Bob Furr also mentioned the Omaha above item, the mailbag also contains the club’s display in a local public library, which excellent Orbiting Eagles newsletter from showed model airplanes to some 20,000 Omaha, Nebraska, with some information library users over the month that it was in about that national “ networking” of C/L place. This could be an inexpensive and newsletters mentioned above. effective way to attract local attention to Robert Furr, newsletter editor, notes that the hobby. the AM A National Newsletter is working (By the way, did you know that most to set up a newsletter exchange between public and school libraries would happily welcome a donated subscription to your favorite model magazines? For several years, I have donated magazine subscrip­ tions to the local library in Cottage Grove, Oregon. The library director tells me it is one of the best-read magazines in the Gene Pape fuels bladder tank In his "Undertaker," collection.) typical fast combat ship. In other news from Omaha, we discover the tank is limited to two-ounce suction, yet another version of sport racing, called and fuel shut-offs are allowed but not hot Omaha Sport Race, which integrates sev­ gloves or quick-fills. eral unique concepts. It’s a bit more com­ It would be interesting to hear how the plex than the typical simple sport race, but event has succeeded. A well-designed appealing to modelers interested in that sport race can become a popular and en­ “ like the real thing” feel. during local or regional activity; the poorly Somewhat like the AMA Goodyear class, conceived ones tend to fall by the wayside the event requires airplanes that look like in time. We’ve discussed in this column full-size racing planes. In the case of planes before the success of some of these events, that don’t come from semi-scale kits (such such as Northwest Sport Race, which has as the Goldberg P-40, Shoestring, Buster, endured with only a few changes since etc.), the event requires some documen­ 1976, and continues to be among the most tation. Dimensions are somewhat similar popular events in the region. It also has to many sport race classes—390 square been adopted by some areas in California, inches of wing, for example. Landing gear Utah and some other places in the West. must approximate that of the original (By the way, Northwest Sport Race and its plane. companion, Northwest Super Sport Race, The event allows Schnuerle ported en­ are on the AMA National Championships gines up to .21 displacement and plain­ unofficial events schedule.) bearing, loop-scavenged engines up to .36. STANDING TALL Mufflers and tuned pipes are allowed; Returning to the subject of newsletters, models with mufflers get a 20-second time here’s an idea that could be adopted by Former MB columnist Dan Rutherford returns to advantage in a 140-lap race (two pit stops local or regional newsletters to add interest combat. Note pad says, "Duke, I'm back. Send required). parts. Thanks. Dirty Dan." Props must be commercially available, Continued on page 84

JULY 1989 51 Designed by DICK BAXTER Text by WALT MOONEY This month we take a break from our usual Peanut fea­ ture and present instead a simple rubber model origi­ nally designed for a junior high school Aerospace class. Anyone can build this one!

II. Rocketry and Space Exploration III. Astronomy Each student is required to write a re­ search paper for each of the three units, and all are given an opportunity to par­ ticipate in various activities. One of the activities is the chance to build a stick-and- tissue rubber powered model. The follow­ ing was obtained from Bob Nutt, and is directly from his letter: “ I met Dick Baxter through a joint pro­ gram that had just been started up between my school district and his company. I was teaching an aerospace class at that time made up of 7th and 8th grade students. We both agreed that an ideal ‘hands-on’ proj­ ect would be to have the students make and fly rubber band powered model air­ planes. "Dick’s first meeting with my class was • This is more a report on a successful had it not been for Dick’s employer. The basically to arouse the students' interest in project involving several people and or­ following is a statement from Vicki L. Boat­ the project. To do this Dick flew a number ganizations (more even than the heading man, Manager for Civic and Community of his own small planes in the classroom would indicate), but if you decide to build Affairs, McDonnell Douglas Space Systems and the students were ‘hooked’ immedi­ the model presented you will be rewarded Company: “ McDonnell Space Systems ately. They all wanted to go to work on with a superb flying model even if you are Company feels it should support local their own at once. They were given the a rank beginner at constructing model educational systems and so formed a option of building either a flying wing of airplanes. ‘school partnership’ with the Huntington Dick’s design or his ‘Pussycat.’ The materi­ This project is one that can be emulated Beach School District in 1987. Since then, als were purchased, kits assembled and anywhere there is a teacher who would company employees have been putting distributed to the students and work like to introduce his or her pupils to aero­ their skills to work with students in a variety began. space technology in a way that is fun, as of aerospace disciplines. The Dwyer Mid­ “The students built their models at home well as developmental in hand/eye co­ dle School model flying class is one result but construction techniques were given in ordination and instructive in terms of basic of this policy.” As a consequence, Dick was class by Dick and myself. We had started aircraft configuration and terminology, encouraged to support the effort and al­ this project rather late in the course so stability, controls and flight in general. lowed time to do so. there was quite a bit of pressure to squeeze Dick Baxter’s design and Bob Nutt's The Aerospace class presented to 7th everything in before we ran out of time. motivation to give his students a bit more and 8th grade students is divided into three "We could see there was a time problem than they might otherwise get from an six-week units: when the students started bringing in their aerospace class might not have got so far I. Lighter and Heavier-than-Air Flight airplanes. There were many construction

The major components, ready for covering (left) and lightly tacked together to show the general configuration. This is Walt Mooney's model and was built with the trike gear shown on the plan. Could also be built as a taildragger or with no landing gear at all—It’s your choice.

52 MODELBUILDER

newsletter. "Wright Field’s Model Of Hie Year for 1987 was Bill O le Yeller’ Hale’s Pee Wee 30 creation that we shall dub ‘Basic Yeller’ for all of the obvious reasons. It was the only Pee Wee 30 combatant to log a 3 max tally in the event all year long!" What I like about Bill Hale’s model is that it is very simple. It is a standard model for the Pee Wee 30 class, except that it has a rather long tail moment arm, and it obvi­ ously flies very well. Additionally, it should be a snap to build. Bill doesn’t give any indications of the flight pattern, but I would suggest that the model be trimmed to fly right power with a right glide. Get a good running Pee Wee and build yourself a Basic Yeller this weekend. CORRECTION TO THE 1/2A VEE THREE-VIEW If you were intrigued by the 1/2A Vee design featured in the March/April ’89 issue of Model Builder Free Flight, I would like to make a couple of corrections to the sketch. First off, if you studied the three- view closely, you noticed that the root wing rib was identified as the root stab rib, and here are the more important ones: vice-versa. This error is easily corrected. 1. The stabilizer airfoil should be as thin The second error was the omission of the as possible to assist with trimming and con­ tip chord on the wing. Although the tip rib sistency of climb and glide. The old theory shows a chord of 4.5 inches, the actual tip was that the stab airfoil should have at least chord is 4.0 inches. In truth, either of these 1% less thickness than the wing airfoil. Stab measurements could be used. I would airfoils should be flat-bottomed. recommend the 4.5-inch tip chord. 2. The longer the tail moment, the less The most serious error on this three-view stab area is needed. Conversely, the shorter was mine. Note that the tiplet is indicated the tail moment, the larger the stab area to be “toed out” at the t.e. This is incorrect. should be. Usually, on fixed geometry The tiplet should be "toed in" at the t.e. models (not VIT equipped), the stab area This means that the trailing edge of the will tend to be 25% to 33% of the wing area. tiplet should be 4 degrees (about 3/16 inch) 3. The angular difference (sometimes closer toward the fuselage than the leading called decalage) between the wing and the edge. Whew! I think that does it. stabilizer is typically in the 2 to 3 degree TAIL VOLUME COEFFICIENT- range, dependent upon the location of the FIND THE CORRECT C C center of gravity. The farther forward the In the last issue of Model Builder Free CG, the more incidence is needed. Flight, I quoted some design recommen­ Now, with all of this in mind, one of the dations by Terry Thorkildsen. In that quote, difficult items to determine is the location Terry suggested that the reader should take of the center of gravity. The Tail Volume a good look at the Tail Volume Coefficient Coefficient is the tool you need to find the article in the 1959-61 Zaic Yearbook. With CG. Elsewhere in this column, you will find the idea that many of you may not have a chart that shows a number of Nostalgia this article, I decided that it would be era models and a computation that in­ worthwhile to present some of the salient cludes this month’s three-view—"Basic points for your edification. There are some Yeller." Here is how it all works. general rules of thumb for you to consider To find the Tail Volume Coefficient, you Bill Crantord, retired and living in Salem, Oregon, as you design your own gas model. It might will need four measurements: has rejuvenated his old Premier Manufacturing Company, that produced the Zeek. Still an active also be worthwhile to reread the design 1. Wing area, designated SW. builder/flier. Bill is shown here with his Pee Wee notes by Sal Taibi carried in recent issues of 2. Stabilizer area, designated SH. 30 version of the Zeek. Model Builder Free Flight. If you didn’t. 3. Mean aerodynamic wing chord, de-

DARNED GOOD AIRFOIL - SCHWARTZBACH 1968

4 STA. 0 1.25 2.5 .5 7.5 10 15 20 25 30 40 50 60 70 80 90 100

UPR. 0 1.55 2.70 4.30 5.50 6.50 7.75 8.50 8.70 9.05 8.75 8.00 6.95 5.65 4.20 2.50 0.75

I LWR. 0 0.05 0.10 0.25 0.50 0.80 1.35 1.80 2.15 2.45 2.65 2.60 2.35 1.90 1.40 0.75 0

JULY 1989 57 1/16x1/8 1/16 SQ. 1/16 B A LSA TIP P LA T E

3/16 SQ.

1/8x1/2

ΓΤ

M Y LA R I COVERING I

Bill Hale's

MYLAR COVERING "BASIC 1/20 B A LSA STA B RIBS YELLER" 1/16 SQ Pee Wee 30

1/8 SQ. 3/32x3/8 · signated E. Using this month’s three-view, the fol­ should balance no further aft than about 4. Tail length (the distance from the lowing information can be obtained: 75% of the mean chord, according to the leading edge of the wing to the 25% chord 1. Wing area (SW) is 150 square inches. chart. To be more stable, the ship should location on the stabilizer), designated Lto. 2. Stabilizer area (SH) is 42 square inches. actually balance closer to 60 to 65%. Now, The Formula is: (SH times Lto) divided 3. Mean wing chord (E) is 5.0 inches. look where Bill Hale balances his model— by (SW times E). This gives a number usually 4. Tail length (Lto) is 20.875 inches. at 60%! Good and stable. somewhere between .6 and 2.0. Using this Multiplying 42 times 20.875 = 876.75 So, now when you want to locate your number, look at the chart and determine Multiplying 150 times 5 = 750.0 CG, consider using the Tail Volume Coef­ where to the left of the line your model The result of this math is a factor of 1.17. ficient chart. It provides a good starting should balance. The further left of the line, This is the Tail Volume Coefficient. Now, point for your testing. It is safe to say that the more stable the model will be. The look at the chart, and find 1.17 on the the model’s CG might be moved slightly closer to the line, the more unstable the vertical axis. Note that this is about the TVo forward or aft of this starting point after model will be. Remember that you don't of the Sailplane (Basic Yeller is in good some actual flight testing. want your model so stable that it won’t be company). In order to find the CG, look The original article for the Zaic Yearbook sensitive to lift. down to the horizontal scale. Basic Yeller was submitted by Bill Bogart and Bud 58 MODEL BUILDER Rhodes. prop shaft. To insure that you get the cor­ larger than 1/2As, then it is a good idea to HINTS, KINKS, AND TIPS rect balance, I usually put a little Hot Stuff use 1/64 ply at the bottom of your fuselage The following tips were submitted by in the center hole before I balance the and wrap it around the corners to dis­ Terry Thorkildsen. prop. This way you will get a snug fit on the tribute the load. You can sand the ply down 1. A fishing line clip makes a perfect clip shaft and the same balance each time you in the areas where it bends around the to which to hook your D.T. bands. You can bolt it to the engine. corners so it will fold around easier. The select different sizes to fit your model. The 7. To insure that your newest engine is ply will distribute the load and keep the slick part about this is you can load the clip really better than your others, you should bands from digging into the fuselage. up with about ten #8 rubber bands and always run them on the same prop. I use 9. In the art and stationery stores (also at only stretch out two or three for each flight. the same Cox gray 5x3 for all my 1/2A en­ Polk’s Hobbies and fabric stores), you can You can load up the clip again when it gets gines. That way, I know what I really have buy a self-healing matt pad that measures low after a few flights. A small piece of 1/64 for comparison. I also paint the center of about 8.5x12 inches for about $11.75. This plywood can be glued on the fuselage be­ the hub with white paint to insure I don’t works great for cutting ribs, and it doesn’t hind the clip location to protect against get it mixed up with my other props. dull the knife blades as quickly. It also has dings caused by the clip vibrating against 8. If you wrap rubber bands around the the model. fuselage at the stab location on models Continued on page 74 2. Have trouble with the rear mounted fin being knocked off? Well, a butt joint is TAIL VOLUME VS. CG LOCATION not the way to go to attach that fin. The solution is sim ple; just put the rudder ZO Pogo · through the fuselage and wrap the fuselage T sides on either side of the fin. Terry notes 1 that he hasn’t used this system yet, but I have used it on all of my models. It works. 1.8 / UHtra Hogan · | Civy Boy

Rarnrod < lSawn • 1.4 7 sTABL E / KivA · / / 1.2 s ailplai Etasic \'eller

• One of the most frustrating aspects of being a model magazine columnist or newsletter editor is the lack of reader feedback in the form of usable or interest­ Peanuts & ing contributions. Your “ Insiders” scribe has been doing monthly columns since P istachios 1967 (that’s 22 years!) and believe me, it Stanford University student Dave Aronstein with never changes! The reader looks for a full Indoor scale Messerschmitt BFW-20. column of interesting, topical, useful in­ cannot be accepted from the U.K. or formation, but he seldom contributes any Europe, as their video system is not com­ of the above for future columns. patible. However, your U.S.A. VHS VCR We would like to again ask our readers will provide you with lots of indoor views. to submit candidates for "Obscure Air­ LIBERTY BELLE ROG craft” (this has been very popular), "In­ Over the New Year’s weekend, Dave sider’s Workshops” (most guys think they Aronstein came to the Delta Airlines need to clean theirs before photograph­ Hangar at Tampa International Airport to ing—not so! Show it like it is.) and "How fly in the King Orange/MIAMA contest. The Indoor Bug Bit Me.” The latter requires He brought along his Liberty Belle ROG, a a little narrative, but should be easy for plastic-propped indoor endurance design. most of you. Simply tell us, in a few words, Despite this being the first time out with what turned you on to indoor aeromodel- the design, his "magic touch” resulted in a ing. Handwritten letters are acceptable, new world record of 5 minutes 7 seconds though we prefer it if the narrative can be on New Year’s Day. This performance blew typed (double-space on 8-1/2x11). The latest from Bill Hannan, volume 4 of “Peanuts away the competition, who could barely So if you would like to share you favorite & Pistachios." Great reading! do 4 minutes. little-known (obscure) full-scale design for your vicarious indoor fun (not to be Our drawing this month, based on the with readers, or let us peek into your confused with “ hangar flying” as practiced 3-view Dave did for Doc Martin and the workshop (we are not the Health Dept.,so by "hangar pilots"). MIAMA newsletter Hangar Pilot, shows all no need to sweep up the debris), or even Mike has professionally produced and the pertinent details. The scale will help learn why you love indoor modeling—get edited a 72-minute video that includes lots you enlarge the parts to full size. Con­ in touch! Other readers will certainly enjoy of variety in models, interviews with fliers, struction is fairly orthodox, but you will your contribution. Send the three-views, and a good sense of the meet. It should be have to scrape the prop blades until they photos, and letters to "Insiders” c/o Dave the "Top Gun" of model videos; we are ultra thin to get it to 1.50 grams. Note Linstrum, 4057 San Luis Dr., Sarasota, recommend it highly. To get your copy, the removable wing is not necessary unless Florida 34235. send a $25 check or M.O. to: USIC Video, you pack the model in a small box for jet HINT OF THE MONTH Mike Arak, 10900 S.W. 61 Ct., Miami, Our hint this month is for endurance Florida 33156. Orders for this VHS tape Continued on page 78 fliers who want to maximize their potential flight times, yet easily assemble their fragile indoor model. The trick is simple—just stick it in a pigtail! No, this is not an ad for pork nor a risque remark. It is merely a suggestion that you use Harlan Pigtail Bearings for your prop shafts. These are tiny aluminum prop shaft hangers with a hole in the front and a hole split by a saw cut in the rear. It is this last bit that gets the r twist; the two split legs are twisted like a pigtail so that the shaft can be easily in­ serted and removed. The locking of the shaft is positive. For your pigtails, in F1D, EZB, or Pennyplane sizes (please specify), send $1.50 each to Ray Harlan Indoor, 15 Happy Hollow, Wayland, Massachusetts 01778. Two or more are postpaid in the USA. VICARIOUS VIDEO If you are unable to travel to the U.S. Indoor Champs in Johnson City, Tennessee this month, or if you simply want to relive the excitement from the 1988 USIC, Mike One ol the full-size plans in P&P vol. 4 is for this Polish Pistachio, the 1912 Drzewiecki Canard as Arak of the MIAMA Club has just the ticket designed by Antonin Alfery of Czechoslovakia. Placed 3rd at 1988 Flemalle, Belgium event.

60 MODEL BUILDER David Aronstein's 1/32 balsa ribs, 1/4" camber, high point @ 40% LIBERTY Notes: 1) Use a 36" loop of ,050x.040 FAI rubber, 3900 turns. 2) Wing saddle sits on motor stick and is held on with two BLUE orthodontal rubber bands. 3) Thrust bearing is a 1/32" O.D. Hot Stuff tube. 4) Use mylar covering. 5) 2 ° down thrust, 2 ° right thrust. 1/8x1/4 taper to 1/8x5/32, with 1/64 balsa tip plates 1/16 sq. reinforce­ ment on lower 1/16x1/8 taper to 1/16 sq. right edge—<

13 1/32 sq. rudder outline

1/32 balsa wheels, 3/4" diameter SCALE

1/20 sq. 8 " Peck prop cut to 6" dia., /Γ - r 1.5 gm. I ______1 0 ------1/32 balsa ribs, 5/32" camber, high point @ 1-1/2 40%

Indoor ROG Record Holder - 5:07 Set at Tampa, Florida, January 1,1989 the scale or F/F modeler. They have been around a long time and for good reason. They are one of the very few sources of Peanut scale kits, and all of them are a work of art. They provide materials for rubber power, CO 2, and electric, plus they have numerous plans, many from overseas. They are one of the main sources of Japa­ nese tissue, Flungerford wheels, etc. The price of their catalog is $2.00, and their address is P.O. Box 2498, La Mesa, Cali­ fornia 92044. By FERNANDO RAMOS Oldtimer Model Supply, P.O. Box 7334, Van Nuys, California 91409, catalog price $2.00, advertises itself as a 1930s model shop, and rightfully so. Even though they • When was the last time you walked into We all need the best in balsa at reason­ cater primarily to the Old Timer move­ a hobby shop and purchased all of your able prices. My model shop carries crud, ment, they carry many quality supplies for F/F needs? Even Japanese tissue is a and expensive crud at that. Not so from the rubber modeler like balsa prop blanks, commodity that is hard to come by in Superior Aircraft Materials. Their wood is balsa wheels (including balloon types), hobby shops these days, let alone rubber, first-rate, and you can get any weight or thrust washers, most if not all of Earl Stahl’s winders, lube, ball bearing thrust washers, etc., etc. I've been trading with one local model shop for at least 30 years. Recently I have made several stops wanting what I considered normal everyday items, only to be told they were on order. It is almost like saying that money is not welcome here! As you probably have experienced yourself, had I wanted any R/C para­ phernalia, I could have walked out a happy man. Granted, we F/F Scale types are a tiny minority, and it is obvious that the local hobby shop is not going to go out of their way to cater to our needs. There is no real money in it for them, so in a sense, I can see their point of view . . . I think! If you have to rely on mail order houses, they also are 100% R/C. If you take a chance and order some balsa from them it is usual­ ly dense enough to builcFanything but light F/F models. Another problem is that not all scale F/F modelers are scratch builders. Pretty Jumbo Scale Cessna Airmaster Is the latest plans offering from Al Lldberg. Text has a list of Where can they get good quality scale kits? suppliers of kits, materials and plans for F/F Scale enthusiasts. Even Flyline kits are not carried by many size you want. The sticks are cut square super rubber scale model plans, plus a lot hobby shops unless it is one of their R/C and you can order any length you want as more. Ken Sykora runs this unique busi­ kits. So, what is this all leading to? Simply well. Their spruce is beautiful, as is their ness; I’ve known Ken for at least 25 years. this. I have made a list of suppliers that plywood. Great service with a smile. provide plenty of materials we need for All modelers need quality wood, and FAI Model Supply, P.O. Box 3957, Tor­ our end of the hobby. I recommend that Superior is the best at providing same. This rance, California 90610 has a catalog avail­ you send each of them a dollar (or more company was started by the incomparable able for $1.50. They are probably the best where stated) for their price list or catalog. Sal Taibi, and is presently being run by his source of rubber anywhere in the country. This way you will be doing business with son Mike. The address for Superior Aircraft You can buy rubber from 1/16 to 1/4-inch the best people in the hobby. Believe me, Materials is 12020-G Centralia, FHawaiian and in between x .042 thick in one-pound they are not in it for the money. . . they are Gardens, California 90716. quantities. They also carry the great modelers helping other modelers. Peck-Polymers needs no introduction to Crocket hooks and have a list of about a

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Satellite City P.O. Box 836, Simi Valley, CA. 93062 (805) 522-0062

JULY 1989 63 Watch for the 13th Edition of the RADIO CONTROL BUYERS GUIDE Coming in September from Kalmbach!

hundred F/F kits. Now, for those who can supply us with introduction either, but Hannan's Runway What about kits? You certainly aren't fantastic plans. Again, this gentleman needs is a good source of books needed for scale going to find any at your local hobby shop, no introduction to this column. For years, documentation. Bill has quite a few vol­ (hat’s for sure! Dave Diels has provided the Al Lidberg has provided some outstanding umes that will be very useful in building scale modeler with a terrific source of kits plans. Recently, he came Out with a jumbo that next scale subject. His address is P.O. and plans for many years now. He has sev­ Cessna Airmaster. This beauty has all of the Box A, Escondido, California 92025. eral that are Peanut size and several that earmarks of consistently being in the Aircraft Spruce and Specialty, P.O. Box are considerably larger. As expected, the winner's circle. Along with a good variety 424, Fullerton, California 92632, has a cata­ kits have the best of balsa and other mate­ of subjects, Al likes to design No-Cal Scale log available for $5.00. Five dollars! Yes, but rials, and the decal sheet in each kit is models. These are profile models that are it has 290 pages. Since this is primarily a unbelievable! The address is Diels Engi­ easy to build and fly. Certainly a good place source of parts for full-size aircraft, why neering, Inc., P.O. Box 101, Woodville, for the novice to begin his rubber scale mention it here? Well, have you ever tried Ohio 43469. flying. Al’s address is A.A. Lidberg Model going into a hobby shop and asking for Flying T Model Company, 134 N. Edge- Plan Service, 614 E. Fordham Dr., Tempe, non-tautening nitrate or butyrate dope? If mont #204, Los Angeles, California, is an­ Arizona 85283. you can find it, it will be in a four or six- other source of kits and plans. I’ve never Another source for outstanding plans ounce bottle at a price you won’t believe. seen any of their kits, but I do have several designed especially for rubber scale is Fly­ Aircraft Spruce sells either of the above in of their plans, and they are excellent. They ing Scale Inc., 1905 Colony Rd., Metairie, gallons or larger at very reasonable prices, like to specialize in the very early airplanes. Louisiana 70003. They have numerous plans plus it is nice and thick, not runny like the I recently received a plan for the Caproni which include Thompson Racers, some kind in hobby shops! CA-8 designed especially for C 0 2. How­ pre-W W II airplanes, as well as several They also carry Super Seam glue, which ever, it could easily be converted to rubber. WWII. Their work has to be seen to be is ideal for both building and covering They also have some interesting photo- appreciated. models. A great source for spruce and etched fittings that you have to see to be­ For those of you who like to build birch plywood, among other items. Many lieve. Great for aiding in the rigging of powered scale models like I do, and want tools that can be used for modeling are biplanes. to power these with a diesel, then Eric also offered by this company. I am sure For those of you in the Southeast, there Clutton is the man to see. Eric is originally that after thumbing through those near is a supplier called Campbell’s Custom Kits. from England, and as you know, England is 300 pages you can find a whole list of things Their address is P.O. Box 5996, Lake Worth, the place where a lot of diesels are used, you cannot do without! Florida 33466-5996; catalog price is $2.00. especially for F/F Scale work. Eric has a lot With the exception of Campbell's Cus­ They have a long list of scale kits that are of expertise and years of experience deal­ tom Kits, I have done business with all of designed for C 0 2 and power. They also ing with diesels. He handles several dif­ the others listed. Each cares about their have a large inventory of goodies that all of ferent types including P.A.W. (Progress customers, and you can’t say that about us are always looking for, like Trexler tires, Aero Works) and Davies-Charleton. Eric’s too many businesses these days. I realize etc. Their 24-page catalog is jammed with address is 913 Cedar Lane, Tullahoma, that many of you like to see what you are all kinds of supplies. They also have non­ Tennessee 37388. buying before laying out that hard earned scale F/F kits as well. Bill Hannan certainly doesn't need any dollar; however, with these businesses, you

64 MODELBUILDER will get exactly what you order, and you will get it post haste. I remind you again that these are modelers helping other modelers. ^ % B A G .# 6 * * * Since Solartex is my covering of choice TY-SIX OF WALT MOONEY’S FAVORITE for all of my powered scale models, I have made every effort to get the best possible Λ , FPEANUT h A T SCALES REDUCED TO EIGHT INCH covering job. Once in awhile I screw up G SPAN ************ $ 5.00 P O ST PAID and wind up teaching myself another les­ son, one that I will pass on to you, hopefully making your job easier from the start. I have found that Solartex does not al­ ways adhere as well as I would like over hardwood such as plywood. Naturally, I fWALT MOONEY P.O. BOX 231192 SAN DIEGO, found this out after I had trimmed the CALIF. 92123 *** FIRST FIVE PEANUT SCALE material and heat shrunk it. It would pull away from the plywood, leaving no choice BAGS STILL AVAILABLE AT $ 5.00 EACH. but to re-cover. The solution is an easy one. I took Super Seam glue (this glue is used to cover full-size aircraft) and thinned it out so that it can be brushed. I apply several coats, sanding between coats. I do CUllFmf) this over the entire structure where the Polyhedral - S44.95 Solartex is going to be adhered to the Aileron - $51.95 structure, not only to plywood areas. This Paul Wilson holds class A distance record 6 6 miles Designed by: is similar to the way you would prepare for 59” wing span · 5 3 oz /sq ft and up Rusty Shaw covering with Japanese tissue. Eppler 214/Seling 4061 /Airfoil choice LeRoy Satterlee I have found that the material really sticks much better, eliminating the possibility of -HIGH QUALITY SAILPLANE KITS- no adhesion. I know that there is a product Terry Edmonds' multi-task sailplanes on the market that supposedly is designed IO - 2 meter 39 oz. & up especially to do the same thing. Well, I CA LLISTO -standard class. 44 oz & up have tried it, and I prefer to use Super Seam for two reasons. One, it does not BE A CULPEPPER discolor the fabric, and two, it is much WINNER! cheaper to buy! ORDER M O D ELS INC While on the subject of Super Seam, for TODAY! 2526 Washington. Outniquc.lA 52001 3191583-4630 those of you who dope your surfaces prior to covering, try this stuff. It saves time and grief. I can’t remember how long it has been since I have used dope to cover a PARAPHRASE model with Japanese tissue. For years I have THE VERSA TILE HLG expounded the virtues of thinned-out white glue, but since the discovery of Super Seam, my covering is made a whole lot easier and neater. Simply brush several 3 PC. WING thinned coats of SS with a little sanding in AMA CLASS A 59" between coats just like dope. But when 352 sq.in. 12-15 0 2 . you attach the tissue using lacquer thinner, 2ch. RUDDER-ELEVATOR the paper stays put, unlike dope. Try it, you will like it. FULL FLYING STAS Have you ever encountered problems EJALSA-5PFHJCE-PLY soldering wire bracing to cabanes or land­ SANGED RIB5-RQLLE0 FLAN ing gears? They slip from their position so 5 1AM3AFID-M IN I -MICR0 RADIO easily that it can be a pain getting things $29=95 t- S2O30 s+h Calif add 6.5X tax lined up. Well, I have found an easy way to do this chore with little effort. See Figure 1. 5976 E Lansng CASH-CHECK-CCD After the wires have been cut and bent WHITNEY MODELS Fresno CA 93727 209-291-7362 correctly, I take a piece of balsa about 3/32-inch thick and cut it to the shape Sheeting a model can sometimes be a of aluminum tubing. Then I bend the tub­ shown on the drawing. I then clamp it to pain, especially when trying to get good ing at right angles as shown in the drawing. the cabanes using little metal pinch clamps tight joints. I discovered a method that After the sheeting has dried, I will mark that X-Acto makes. works quite well and is very easy to do. from the inside using this simple little tool. The diagonals are put in place using a Take a look at Figure 2. Naturally, the two Remove the sheeting and trim the excess drop of CA glue at either end. The balsa is sides are easy to sheet. I prefer to frame using a sharp knife. Just a bit of sanding to temporarily removed and the joint where two fuselage sides and sheet these, rather get the correct angle will be all that is re­ the soldering will take place is carefully than cut two sides from balsa sheet. Where quired for a neat fit. sanded or filed for good solder adhesion. the fitting can be a bit trying is over the * · * These joints are then wrapped with fine turtledeck and the front cowling. I’ll take I want to remind you of the Flightmasters copper wire. The balsa sheet is once again balsa sheet (usually 1/16) and wet it and Flying Aces Contest scheduled for August clamped in place, and each joint soldered. wrap it over the formers using tape to hold 12th and 13th at Mile Square Park in Foun­ The same is done for the other side. When it down until it dries. tain Valley, California. The judging will be you finish your parts will be in perfect While the parts are drying, I will sharpen at my home with a great catered picnic and alignment! a piece of pencil lead and CA it intoa piece lots of story-telling on the 12th. For further

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! 65

M M I ·] F

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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 ond custom racing drill blank shafts for silky smooth action imports in the toughest kind of shocks off-road competition. Rugged, yet light, the suspension gives you all the adjustability of full size, full race The All-American Associated Competition RC10 took home the gold in modular buggies. The A-orm/Ball joint design allows both the ROAR and ORRCA precise camber, coster, ride height and National Championships. spring rate tuning. Even anti-roll bars Our RC10 turned bock the and a VariLok difare included. foreign cor 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. Tealrcrotl A RACE CAR. NOT A TOY. aluminum GET THE JUMP ON THE COMPETITION. Sure, you've heard that before. monocoque Iud Go RC off-rood racing with the But Team Associated designs leaders. The National Champion and engineers only model RACE cars. RC10 is available now and legal for ROAR and ORRCA nationally sanc­ The new RC10 features fully adjustable, four 4 wheel skid plate tioned competition. wheel independent suspension, an aluminum independent alloy monocoque tub and race-proven hordware suspension Complete RC10 kits, replacement throughout. parts and spares are readily available through And the RC10 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 and build yourself a winner. standard equipment. Team Associated's RC10. Sealed gearbox RACE-WINNING ENGINEERING. VorILok differential For maximum traction ^ the RC10 suspension Smooth undercarriage maximum ground clearance is damped by long throw,

Model cars for Real racers. Full race rear suspension Includes bulletproof holt shaft and u-Joinls with tapered ond Associated Electrics keyed modular wheels. Quick release knock 3585 Cadillac Ave., o ft design tor last pit work ond tuning. Costa Mesa, CA 92626 (714) 850-9342 0 1984 Associated Electrics Scale Model Ships fsc*1 K eep 'em Flyin g W ith HniOiinc Smeed. Devoted e iitu yve ty to working scale 1 ( ·4 1 . i n m m i i ______g^iito Ikrrailini model ships and boats c l alt types lor the \ I im r i SV>kl Airjijni * n o w * or mtemeefiafe builder Covers chocs » μ ^ Λ Λ Μ * Z E N IT H mg and building stops from kits plans and β | ρ f » · drawings Chapters on design constructor! · * - and radio control 144 pgs 1 1 3 4 2 3 A E ...... $17 .9 5 BOOKS.. How to Choose RfC Model Engines How to Make the Right Chore* For m m Your Plane. Boat or Buggy Pratt Comprehensive guideto over ISO dif terent engines Covers specs A perlor «nance rates the engines & installation advice Spor tflier's Guide to Finishing & ‘ ' ” * A P ■; _ ...... 5,255 R/CM«WAtipLaneDesign Detailing Model Airplanes Rubber Powered Model Airplanes. Radio C ontro l Handbooks Lennon How to design & b u tt your own R X Troy Written specifically to ansuet Ihe Bask Handbook These books contain everything the R X mod airplanes Not highly tectim c* but very com Designing/Buildmg/Flying tkt needs to know about his respective top ftete Canards & tandem wings ftyvng boats Ross A comprehensive gutoe to rubber p o · c s F ro * Meeting the model or equipment ghoerc & tailless planes trful professional looking brush A thorough ered modeing Took materials selection through installation A construcbon to fiotsh 111070AP ...... $16 95 how to guide thaf provides last, easy teen construction blushing, flight tnrrmming N E W B O O K S mques lor finishing and detailing R X model competition A design ire art covered Wei S irw m tf BIT Hnfcrmi·· riw Mo<^ Awcraft Aerodynamics Π3600ΑΡ Setting Up R X Helicopters. Day Theory ^ ^ ^ f0 ubtes of airplanes Includes afftrame preparation ti lustrated with dear concise dnehons A &s Plastic Modeller's Handbook " i : . · · · · . opbmiwn auforf seebons thesa te effect m Stealth Bomber: ImnsiWe Warplane. b«rglass dc4h and poVester resin con on cussion of the fundamentals of rubber po* 8 art*r Modeling bps tricks A techmroes coverings dope silk and sA span the cock etedflight 144gps 80ifl 113599AP In s ta llin g R/C Equipm ent, modrf planes performance trim stability etc Black Budget A iiaa tt stop and wtomobwe modeling are A H Revised ed r painting personalizing your 1 1 3 3 3 0 Λ Ρ ...... S 1Z 95 Swertman with foreword by Tom Ctanrv The e x h addressed «i theu own rochoos Toptcs moan ana mote 160 pgs 200 iB 113601AP Budding from Plans. Boddi^ton JU 9 3 3 A E $27 .9 5 levotobonary new B 2 urw ted m 120 bA* mctodepainttfu tdbeum accessories an Aerodynamics of Model Aircraft Flight photos that are the first detailed pKtorat re 1 1 3 6 I9 A P ...... $ 1 2 9 5 Simons If you're building or thinking ol AduanrMi OniiU in Schluter's RJC Hciicoplcr Manual toatang ortaikng special techmoues. prod cord m print Sweetnun deliver» a thorough uds sandng weathering dioramas super AircraH Archives budding your own plane you must ita d this 5 2 ? S S i « b L, c l- ;,,,. The table on flying R.C choppers B a s o ol R a d » C o n tid Sp ort F lyin g helicopter technology, rotors A dynarmes techmcai analyvs ol tho revoluboniiy new detailing manutacturers suppliers and A must lor modelers A enthusiasts' Detailed No math no formulas ju st a clear under Praff Scratchbidders A M lto to e rs toe ( M l trammg perlormance calculations A plane and its capatakfces Ito s i: me d d tt much more 224 pgs approx 150 ill into on each awerafl plus cutaways three stantang ot what makes the plane brtiave A book is a must for your workbench' Complete bu>ld*n£ techniques 256 w s 100 a- 41 five source on Bk moerkWe «rplane 176 M 3 8 0 6 A E ...... $ 2 2 9 5 new drawings cockpt dograms weapons misbehave so you can be a better rod d er 0« I57bAwitt Vought F 8 Crusader specifications A performance data 96 pgs Includes design props controls, «mgs A more 144 pgs 80 iH '°'«2* ...... 52,55 Π 3 3 2 9 Α Ρ ...... S14 .9 5 Merwy One of the j i tune trnat naval com 52 photos 96 drawings for construction plus mfo on American Mod D esigning & B u ild in g Ftymg Models Favorites ol Ihe Fifties bar aucraff the supersomc F 8 Crusade was 113008AE Postwar Jets. VoL 2. includes A7E 1 1 2 6 6 8 A E ...... $18 .9 5 eters Assoaafiott insurance, chartering a dub Composite R/C Aircraft S a w d A wonderful codecbon of plans tor the last m a proud tone ot single se a l gun Dusader. F 4 Phantom. F-105 Thunderchiet. Radio Control: Handbook of Theory & A ru n n m faco rtesl 160 pgs 86 iU Lambie Complete rutoe showmg bow to the model planes ot the fifties Over 100 pop armed Aftoers tram Itouiht Here is the lu ll Sea Hamer, and 18 more ...... $16.95 P ra c tk e 1 12988A ...... $ 9.95 build strong hghtwajM A beautdul models lia r p ian n with capfeore B u i offer tnugta story with 160 bAw lifustrabons and 1? 113009AE Flghtea of W.W t l. Vol 2. CAw ill 17 R X theory together with precise ronstruebon in * to recreate one of torse lantastic pUoes color pgs Focke WuN FW190. and 10 more1. . . $16.95 d e iah . Includes aro n t schematics MS pgs Radio Control Sport Flying h ? aq 7a p 516 95 o* lor ius> temimycmg 9* pages of bAw iB 113493AE Postwar Jets. Vol 3. Includes Pratt A must for anyone thuimitg of getting 1 · ™ ^ ...... * IW D 113706AE ...... $22.95 107501A ...... $24 .9 5 1137 MAE $17.95 Skvray De Hawltand riampne and Swallow started in the hobby Comptoiefy details eve R iC Ducted F a n s : How to B u ild & F ly Douglas A 1 Skyrader Flying Model Helkopler* From 8asks Asian Air power Dorr A veteran of Korea and Vietnam the MiG 11 and 21 Saab J2 iT u p o ie v Tv 104 Othmgtne novice needs to knew about build Your Own Je t S u cc e ssfu lly and 11 more...... $16.95 lo Competition mg from scratch ot M s Covers buitdmg A Faneft An expert shows you the secrets of Exotic Warplanes In Action 113492AE Bom bas ol WWH In clu d e B 17G flying trainer ptanes perl planes gbders building your own ducted fan Construction StomeoM Some of the m cit ipecam tar w d mg story trpm the drawing board to ih last Forties Dauntless Lancaster Mk t A III B scale models giant scale models ducted finishing A flying without crastong 176 Pgs beautiful air to n r photograph m print The 241 lite ra to r Ilyushin $tormova and 16 tans betsi A nebcopters 144 pgs. 80 ill 150Λ planes range from Pakistani F 16s and A Ss mover over Sagon in 1975 Rutiratod *th more $16.95 I12989A ...... $9.95 Π 2388ΑΡ ...... $ 1 2 9 5 to Indian Mirage 2000s to Japanese Mihu many rare «to p w o o V y unpublished photo toll* F Is Eitetefrt rotor and h*h «storWy graphs 200 pgs 160 bAw rrt !2 color Selecting RJC Systems & Components Learning to Fly RJC Model Airplanes m arkup make Bus a great book tor the cn page lo r Your AirplaneJBoat/Buggy CanoB Detailed text A 700 ihusbabons show B u siast and modeler 128 pgs 122 color 113707AE ...... $22.9 5 Pratt Gives you a complete rundown of all you everything bora the basics to advanced photos the products on the market A helps you de Excellent tips oo all stages ol Vietnam: Combat Iron Ihe Cockpit terimne which are best tor your model 122 ttfh t & p g s . 700 4 113679AE ...... $14.95 Don No other account lekves the war in pcs . 444. 109661B ...... $9.95 F 16 Fighting Falcon such startling color the Wood, the sweat the foster The F to n the largest tighter program tear and Ihe victories Over tfartv airmens Π2459ΑΡ...... $11.95 Control Slope Soaring m flie non Soviet world F 16 f * M r * Fakon lememtaioces combined «ffh technicat and How to Choose R eady-lo-Fly Awplane Hughes Top.cs .a T < h o T w d u m c s ot captures Bvs strategic twd in 56 toflcofor historcai oeccnprons of the hardware 80 K its : M aking the Right C h o ke slope lilt flying different types ol W s. trim photos m action with an torces around the lufl color photos of ihe ptanes and hebrop Pratt Analyses all the off the sheff models on mmg the plane tor aerobatics, scale designs world An eaceUent icnew ot the Western t e : they loughf m and sometimes tie d m the market A M b you which e best lor your serial photography contest awlorfs etc 328 world: most important fighter 6 4 p g v .5 6 « ■“ s 8 0 4 skdllevef II2 p g s .6 2 ill pgs. 1S1 photos 2l4diagram s 113657A £ ...... $ 8 9 5 $24 .9 5 112491A P ...... $12.95 107617A ...... $24 .9 5 W orld-Class M odeling Books 113377 113366 Aces H igh...... Giant Steps: Book of Giant RJC AircraH Radio Control Giant Scale Aeroplanes : i f v 113280 BorJdineon Chapters include Select og the Π 3310 % scale models! M s. plans props flying Stolls construction bps radio (ear plus art Model How They F tjr Kris Plans or Cwn De 113298 sign Materia>: and A iPw srve. Geanal Con 113304 you want to know about buying, building A rtuchon Wings and la flsu ifa c e Em m ks 113308 « id A nciflivw s Rigging and Struts Rk Ao 113331 25.95 101 $ 1 2 .9 5 Control Systems Detailing Float Ptaw s and 113328 Alaskan Props. Osprey Colour Library ...... 14.95 much more 246 pgs 113296 America s Top Guns 57 color mm VHS NEW 32.95 Complete Manual of Eleclrk 113066 Propulsion System s: Quiet Revolution 113246AE ...... $21.95 N B W 1 113148 Boucher. Picked with o to on Nicad batteries, Introduction to Electric Flight 113064 NEW 10.95 props motor gearing fast charges, motor Peacock Learn B« ms A oats ot dear. start 113656 Boeing 747 ...... 8.95 speed co n tro l boats ptanes. h eto p te rv power Details all aspects ol etectnc RX 113217 eteTO p p 112637 m : ■ P i 107638A ...... $ 12 .9 5 lf o iS f * ...... $19.95 103028 C arter Aviation 12.95 pr ·*·> '· >-·■·:·■· FockfrWulf Fwl90 Tal52: 113302 Cry o l Battle 99 color own VHS NEW 39 95 largest concerffrahoo of Brg Props" in Ihe Avcratt and legend w ortj You ve (tarty got to matte m Miami 113584 C 130 The Hercules ...... NEW 12.95 Nowarra Recw tiy ttansUled bom German 113400 Dec 7 1941 Japanese Attacked Pearl Harbor NEW 22 95 and B ra e * A Wagner haw done just that to this book chrowdes the history of Bus brutal capture the best of these timbering old teds 113426 (tore Bombers m Action NEW 29 95 tooting and eflecfcve hghta bom conception 113680 Eject' Eject1 History of the Ejecboo Seat ...... 2195 in wonderful rotor photography 128 pgs and rtevelopment to the production of the Encyclopaedia ol M ilitary Models 122 color 4 113356 NEW 19.95 Tal52 Decided torWs a ta flth e vahiborvs ar 113071 Esco rt The P 51 Mustang· 60 min VHS . NEW 39 95 113325AE ...... $14.95 mamert engine specs, performance and 113798 FightersoMh*US Airforce SPECIAL 18 98 Cobra: Tank Killer Supreme combat roles 250 ♦ photos A tine drawings 112942 TheFebtinglady 60min VHS NEW 32.95 Wen*» Conceived during the Vietnam war d 113284 flight Into Heff. i3 min VHS...... NEW 39.95 was the tost hekopto ever to carry the "A i u S & t t ...... * 1 9 9 5 112940 Flying the AH-1G Cobra Gunstop 65 mn VHS NEW 32.95 tor Attack' designation A tantasbc photo 109981 Flying RfC Models Video VHS ...... 39.95 traptnc leccxd o< the qumtessensiai attack Combat Air craft Recognition 113610 F 8 Crusader Detail A Scale Series. Vof 31 NEW 9.95 hekopta Included are all the variations oe March An mvMuaMe gu.de to rorabat air 113538 Getting Airborne Vofurae I NEW 12 95 vttoped over the years mdurtoig the latest a a lt Detab the many arruait kkefy to be 113539 Getting Airborne Volume II ...... NEW 1295 AH IW 128 pgs I h ) color ill seen at operabonal awheids or at the many 113773 Ill Dvectory ol Fighting ATColWWII NEW 15.95 I13620AE ...... $14.95 Eurroean and U S m ho w s open to the pub 113800 HI Directory ol the US Air Fo rce ...... SPECIAL 16 98 he E x h type of aircraft n .dusirated m tuO 113809 Jane s A ll the W orlds A/C 198*89 NEW 165 00 U .i Navy Air Wmey Flamboyant color and mtormaboo on spccA attens se 113797 Jane's Fighting A JCoim tll SPECIAL 25 98 M arkings 1 9 6 5 7 5 vice and recognition are provided for the ex 113255 KoKu Fan April 1988 ...... NEW 6.5 0 Francillon A Lewes Skyhawks Crusaders pert and amateur ahkt 144 pgs . ISO color 112983 KoKu Fan Famous Airplanes ol the World Grumman NEW 6 95 Vigilantes. Phantoms A SkynrgWs wearing 112982 KoKo Fan Famous Airplanes ol the World Zero NEW 6 95 some οI the most lUmboyant w carfl mart 1 I3 3 2 1 A E ...... $10 .9 5 112984 KoKu Fan February 1988 NEW 6.50 tngs ever Vivid rotor photo: A high Quality 113254 KoKu Fan No 41: U S Forces Japan/Sth AF 194588 NEW 17.50 printing bong these wapnahve tards home 113744 KoKu Fan No 42 Japanese Imperial ArmyfNavy A/C NEW 17 50 to you 128 pgs.. 122cotor4 Lockheed Blackbirds 113743 KoKuFan No 45: U S Navy Fighters ol WW2 Thronborough A Denes The story of the NEW 17 50 113326AE ...... $14 .9 5 112985 KoKu Fan January 1988 NEW 6 50 Blackbirds the SR 71 Habu the D 2 Dragon 113256 KoKu Fan Mxch 1988 ...... U 5. Navy CAG A/C Colors 6 Markings: Lady, the TR1 A ER 2 ail currently ft^ng NEW 6.50 113621 KoKu Fan Monthly. May 1988 NEW 6 50 throurhout the world Firsthand accounts Fig h ters 113228 Lancaster at W x 2 NEW 28 95 te u y & Leader Owe 250 photos A mtornu trom Bfacktard prints But portray these dat 113225 L ig h tn in g ...... bve capbcns detail the planes A markings ct n f spyptones at work, illustrated with many NEW 19.95 113561 Lockheed U2R/TR 1 Mmigraph No 28 . 9.95 unpubksh^d photos A scale drawings The the Comnande» o l Bie Air Group' P * » « i 110681 Manual ol Electric R/C Cars 14 95 Inctodes F 8 Crusader. F 4 Phantom A F-15 most revealing book yet published on USAF 113486 The M xhn 8 26 Marauder tomcat 6 4 pgs. 2 1 0 4 ------144pgs. 250 4 NEW 1695 pgs- 2 5 0 *. 113218 McD Douglas F1A-I8 Hornet Aerogutdc *20 NEW 7 95 113065A ...... $14.95 113469AP ...... $18 .9 5 113753 MiG KM Markings o l Vietnam War CAM V 12 NEW 11 95 113314 M ilitary A X . V o T l. No I 60 min. VHS NEW 39.95 Order Toll Free 112960 M riitary A/C. Vol 1. No. I ll VHS ...... NEW 39 95 SUPERBASE SERIES 113483 Model Car Building Advanced Techniques ...... 9.95 Explosive new books profiling the famous fighter je t weapons schools in the United States 113632 Model Car Building Getting S txted NEW 9.95 This fascinating new ά /perftwe series profiles the events acboo and day to day operations 113774 Modern Carriers NEW 14 95 ol our top military flight instruction schools Over 100 hot action color photos capture the 113775 Modern Fighters NEW 14.95 Wl & Canada use 1 715-294-3345. men and machines These books offer the firstever furt rotor coverage showing what ft 113363 Modern MiWary A X : Hornet NEW 6 95 1DOAY MONEY BACK GUARANTEL LIBRARY ORDERS A DEALER INQUIRIES INVITED takes to become the best fighter prfotsm me world Each ts 128 pgs 120 color photos 113219 Panavia Tornado F Mk?.'Mk3 Aeroguxk *21 NEW 9.95 Heats can be charged lo M asterced. Visa. 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JULY 1989 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 69 WEE R/C Instead, I screwed another piece of ply to three feet altitude during the landing, and While on the subject of mini-models, the floor of the fuselage, and rubber the nose took a beating from the ground. we have it on good authority that a truly banded my battery onto this plate. This But a new cowl and gearbox will have this miniature servo has been constructed, allows me to use larger batteries than little plane in the air once again. The first suitable for indoor Peanut Scale applica­ would fit in the standard battery tray. flight was a lot of fun, but next time I'll wait tion. More information should be available "The motor supplied in the kit is a Le- for calmer weather! in a later column. Mans AP29R. The name doesn’t reveal "The instructions were clear, and this CUILLOW MODELS MILLION much, but it’s an 035 sized motor with a would make the model suitable as a pri­ WILLED TO UNIVERSITY reduction drive, turning a 7x6 prop. The mary trainer (with some guidance, of The will of the late Gertrude H. Guillow, instructions call for a six-cell 600 mAh bat­ course). No control throws were given in widow of company founder Paul K. Guil­ tery pack but I installed a pack of six 800 the instructions but I found that 1/4 inch low, allotted one million dollars to the mAh Sanyo SCRs for longer motor runs. each way for the elevator and 1/2 inch Carnegie Mellon University, according to The kit includes a regulator and cut-off each way for the rudder were plenty. It an article from Carlin Hulick sent by Harry unit, powering the receiver from the motor served as a great introduction to the world Geyer. batteries and turning the motor off as the of ARFs! Mrs. Guillow remained active in the voltage drops. There was no provision for Derek J. Buckmaster model airplane business until her passing adjusting the cut-off voltage, so a ground 251 Fenn St., Apt. #6 at age 82, and had long been honored for test checked the factory setting. The bat­ Pittsfield, Massachusetts 01201” her community service.The grant is ex­ teries had enough power left in them for And that, dear readers, is a kit review pected to be applied to University expan­ just over six minutes of continual control Australian style! I hope you all enjoyed it as sion, and should insure perpetuation of movement on both channels after the much as I did. Derek’s full address has the family name. Incidentally, Harry Geyer motor had cut. This would result in a much been included in case anyone has informa­ confirmed that the name correctly pro­ longer time in the air, as control inputs tion on the Taifun to send him. nounced is “ gw-illow," with the "gw” as in during the glide only really amount to a If the foregoing report didn’t sufficiently Gwinn, and the word rhyming with "wil­ number of trim changes! impress you with the intelligence of our low” as in the tree. “ The Express has a span of 64-1/2 inches readers, let me introduce you to another SIGN-OFF and is 29-1/2 inches long, and my model’s of our East Coast ARF experts, Sal Lucania When asked how he manages to build weight of 32 ounces gives a wing loading of of Trenton, New Jersey. Sal has been in so many models. Bob Jones of England 14.9 oz./sq. ft. modeling for forty years, and at the time of replied: “ After 37 years in military aviation, “ We had a little snow before Christmas, this writing has just completed his twelfth I have retired to model building, running so I had to wait for suitable weather for a ARF. He belongs to three R/C clubs in his the local club and helping out at all the test flight. The best day we had was prob­ area and from time to time provides me competitions I can get to. Don’t leave it too ably a little breezy in hindsight, but I with evaluations on various ARFs, many of long to try it for yourself.” · headed down to the field during my lunch which are of interest to our readers. Sal hour on the Thursday before Christmas. writes: Enough of the snow had melted to recog­ AR F s ...... Continued from page 43 “ I’m enclosing pictures of a Royal Chip­ nize the strip, so after a quick radio check, munk 40-45 (59-inch wingspan and 573.5 core also contains a plywood plate for off she went. The first launch resulted in a sq. in. area) as built by George Wright of mounting a plastic bracket for the under­ quick dive into the ground. OK, how about the West Windsor Flying Club (New Jer­ carriage. The wheels are only 1-1/4 inches a little up-trim? Second throw was fine, sey). This is the second Royal ARF I’ve seen in diameter, so hand launches are needed and we were airborne. The climb was brisk at the WWFC. Although a good .45 would at my local club’s grass field (Berkshire R/C in the breeze, and the Express was very fly this model quite well, George chose a Flying Club). controllable. The motor ran for about three .60 for some really spectacular accelerated “ The two servos are mounted on a ply­ or four minutes and finally cut out at aerobatic performance. A nice combina­ wood servo tray under the pilot figure sup­ around 400 feet. This was a good climb, tion, George says it is not difficult to fly. I plied for the cockpit. The tray is pre-cut for and included two loops under power on must admit it looks rock steady in the air. micro servos but I only have mini servos, so the way up. The glide was one long vertical Takeoffs are fast and straight and landings the cutouts were extended. The ply servo descent into the breeze. Unfortunately a are smooth.” tray also includes a battery mount section. gust tipped it up on a wing tip at about Sal next reports on the Royal Telstar 40,

70 WHEN CONTACTING ADVERTISERS, TELL'EM MODEL BUILDER SENT YOU! MODEL BUILDER FREE FREE SHIPPING SHIPPING

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JULY 1989 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! 71 pairs were necessary. A word of caution K&S Engineering here—always check the accessories pro­ 6917 W. 59th St. vided and if they do not come up to your Chicago, IL 60638 S oldering Tools standards, throw them away! Also, as I don't know how strong the stab is on the Striker, I would back off the throttle during the back end of a loop, a split-S dive, or any diving maneuver. All in all, with a little work, this is a good looking, great flying, pattern ARF!” It sounds as though Sal really likes to wring out his ARFs, judging from his letter! He goes on to close out his report with one Model 1210 Model 300 more evaluation: “ My Challenge II is now two years old. I have seen two others and they all fly very ■* Model 212 — Pencil type iron gives 30 watts capacity well. I don’t believe they are advertised of fast heal for field repairs using a 12 volt battery for power. any longer (originally Hobby Barn/World * Model 300 — Iron gives you 30 watts capacity, is light weight, Model 212 Engines, Inc.) but you still may find some pencil type iron. * Model 910 — Iron has a capacity of 60 watts, heavy duty iron. around. The first one pictured is mine, * Model 1210 — Gun provides 100 watts capacity, heats instantly. powered by an O.S. .90, and the second is Send $1.00 for catalog and prices. — Telephone: 312/586-8503 Rick Radcliffe's, powered by an Enya 120R. Both aircraft required structural changes to make them safe to fly. These changes involved strengthening the wing hold­ down blocks, landing gear supports, and wing servo boxes. Since these modifica­ tions both aircraft have had many flights and are really fun flying models. They are relatively large at 70-1/2 inch wingspan; this makes for good visibility, lighter wing iMSwmsnfT loading, and smooth maneuvers.” COLLEGE OF GLUE KNOW LEDGE OK, that does it for this month. I hope the rest of you ARF enthusiasts will write in and tell us about your latest model. Photos Zap A Gap CA + are especially welcome. Please direct your A bit thicker. Set time: up to 5 seconds. correspondence to 2267 Alta Vista Drive, W orkhorse of the line. Glues most dissimilar Vista, California 92084, (619)726-6636. · m aterials...balsa, plywood, hardwoods, plastics, etc. Bonds through oil and grease. Excellent for field repairs. #1 m odeler s B ig B i r d s ...... Continued from page 25 c h o ic e . E-power. Avoid draggy designs at first—no bipes, struts, radial cowls, etc. Pick a simple, Prof. Sticky VonShtuck Pacer Tech, Campbell C A clean machine. “ Of course we’d have to add a couple of fat wing tips to the Kadet Senior to make owned and operated by Ben McMichael, Another photo from Sal depicts the her IMAA legal (80 inches for a monoplane another member of the WWFC. This ARF Striker, a 62-inch ARF from RTF models in and 60 inches for a bipe) and possibly beef has a 58-inch wingspan with an area of 593 the U.K. He describes it as follows: up the wing centersection to handle the sq. in. Ben's Telstar came out at 5.75 pounds “ I made a few changes that I thought extra weight of the batteries. This bird equipped with a Super Tigre .45 with a necessary to the model before the first should perform beautifully with the 40 sys­ Perry pump and MAC muffled tuned pipe flight. First, I threw away the tank they tem and give years of enjoyment. and header. Ben found that the wing inci­ furnished and installed a Goldberg tank. "I use primitive scratch-building as my dence was slightly positive and corrected it Next, I converted the fixed nose wheel to a technique. I lay out the components on to zero degrees. He thought that the en­ steerable configuration and installed di­ my workbench and just build an airplane gine cowling as designed in three pieces hedral braces in the wing. Also, I held the around them. This is fun building as you’re was somewhat difficult to handle, and that wing to the fuselage with the dowel-and- really not too sure what will transpire. a one-piece fiberglass cowling would have bolt method rather than the elastic band Naturally it’s best to use conventional been preferable. Another small improve­ way. The remainder of the construction planforms to insure success. . . and let’s be ment he felt was indicated was to secure was straightforward. I installed an O.S. SF honest, it’s good for the old ego to show the motor mount to the firewall with the ABC .61, and Airtronics radio, charged up, up at the field with your very own original. addition of blind nuts. This would make it and went out to fly. I ran two tanks of fuel "Comparing E-power to gas engine easier to replace and/or tighten the motor through the new engine, then put it in the power is like comparing apples to oranges; mount. Also, Ben reminds us to seal all air. Beautiful! Great! Love it! The roll rate they’re just too different. Each has its own joints in the covering with thin CA to pre­ was a bit slow, but that was easy to fix. place in R/C, and it goes without saying vent fuel seepage. Ben, a conservative Flights two, three, and four were also un­ that piston-pounders definitely have the gentleman, says, "It flies real good." eventful. Then another fault turned up. performance edge. But E-power really Sal adds, "I've seen his Telstar 40 fly and While taxiing back to the flight line the comes into its own in scale applications, I’ll say a bit more. It doesn’t lack for power. engine fell out. The motor mount they and for many of us who are just plain sport His plane weighed in at four ounces less provided couldn’t hold up under the fliers it can't be beat. When I arrive at the than the advertised six-pound weight. It is torque of the engine, as both beams of the field with my electric-powered birds I’m a smooth flying machine that tracks well. mount broke. The beams of the mount all ready to go, so I head right for the Perhaps when he gets a few more flights in were only about half the cross sectional frequency pin. In addition to the fuel being I’ll get a chance to check the roll rate for area of that of the Great Planes mount that free, my airplanes stay CLEAN. myself. The takeoffs and landings are I finally used. Fortunately this happened "And by the way, I’m not one of those beautiful.” while on the ground and only minor re­ narrow-minded guys who flies only one

72 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! MODELBUILDER kind of aircraft. I do enjoy big gas guzzlers. My 148-inch Cub still flies majestically with H obby H o rn a 10-hp Sachs engine up front, and my hobby specialties other two, a Nosen P-51 and an original called Bubbles, are too big and heavy for Kits from any current electric systems. P& W "Try E-Power, you'll like it!" Model Service 1935 Miss America 84' $71 96 19 36 Buccaneer 84’ $59 96 WHY CURE OF THE MONTH 1937 Dallaire 108’’ $75 1 6 1938 Clipper Mk I 72* $4156 1938 KtoixJ King 63’ $42 36 1938 Powerhouse 84* $53 56 SHOULD YOU HAVE Nino Campana offers this cure for con­ 1938 Record Breaker 96’ $69 56 1938 Trenton Terror 72* $40 76 stipation: Have a nurse bring you a piece 1939 Korda Wake 44’ $19 16 1939 Morcury 72" $58 36 1939 Zipper 54* $53 56 1940 Ranger 46* $3196 TO REMEMBER TO of cheese, sit on it, and then swallow a 1940 Sailplane 78* $84 76 1940 So Long 50’ $30 36 1941 Brighter 56* $40 76 1941 Super Quaker 78* $72 76 mouse. It never fails! 1941 Playboy Jr 54* $31 16 1941 Playboy Sr 80* $51 16 TURN ON YOUR We’re all pretty well into the flying sea­ 1941 Brooklyn Dodger 56· $42 36 son by now so think safety. And why not Midway Model Co.: Full Kits TRICKLE CHARGE 1936 Flying Quaker 84* $64 76 1938 Powerhouse 50* $29 96 take a youngster with you next time you go 1937 Long Cabin 78* $47 16 1939 A T Sporlser 50* $29 96 out to fly? Let’s share our enjoyment; it’s a 1937 Quaker Flash 67* $45.56 1940 Buzzard BombsheH RATE? 1937 Air Chiet 61* $35 96 72“spanki $56.96 great way to "pay our dues.” 1940 New Ruler 74* $71.16______50* spank! $35.96 Al Alman, 16501 4th Avenue Court East, The above kits qualify for Sam events (FF & R/C). and feature the highest quality machine cut & sanded pans, all sheet & strip Spanaway, Washington 98387, (206) wood, wire, & window material. Most plans arc the original 535-1549. · FF, but the models arc easily convcnible to 3ch R/C Sailplanes, Electric Power or das Kits MIDWAY MQPU. CO, ELECTRIC MODEL DESIGN Gnome HLG60* $24 00 Sky Knight 44* (05 Dt) $24 00 E l e c t r i c ...... Continued from page 41 Gnome 2M Glider 78* $37 96 EJectraGkde II 73* (05 0) $31 00 Fast Eddie (05 D) $24 00 Lightning 36* (05 0) $24 00 ion gear (this one is a press fit). You would UlraMkIV (06 G) $37.96 Thermic Travetlor (05DorG)$3i 00 Electric Playboy (05 G) $26.00 have to destroy the gear to get it off, as it is Hobby Horn Sensoar Glider 78* (or 05 electric) $18 00 pressed on so far that a gear puller cannot Astro Challenger (05 Geared) $32 50 Astro Vicing (05 Geared) $32 50 reach underneath it. The shaft and housing Astro Ponerlield (15 or 25 Geared) $59 96 Astro Sport 37* (05 Direct) $29 96 could easily accommodate a set screw type Dave/sRobm (05 Geared) $33.71 pinion. It appears to use 48 pitch gears, Dave/s Le Crate (05 Geared)______$35 96 which are readily available at any hobby FULL LINE OF ELECTRIC SYSTEMS & PARTS AVAIL Do It SHIPPING & HANOLING 76 Page CATALOGUE store that has off-road car parts. I would Up to $800 add $200 $2.00 pp/lst Class, or free also like to see some way of mounting the $8 01 to $20 00 add $2 50 when requested with order. AUTOMATICALLY gear unit to a firewall. None is provided, $45 01 to $70 00 add $3 75 H O B B Y H O R N Over $70 00 add $4 50 with an Ace however, most gearboxes don’t have this CA Addressees add 6% tax Send 15173 Moran St (B) feature anyway, and most are mounted MO. VISA / MC (· & Exp) or Check P.O.Box 2212 (alow up to 30 days lor check Westminster. Ca 92684 with the motor in a cradle or motor mount. clearance) AUTO-TRICKLE (714) 893-8311 Three gear ratios are available: 2.5,3.0, and COD - Exact charges plus $i 50 handling (Cash Only) Hrs: Mon-Fn 9AM - 5PM 3.8 to I. These are stock numbers 6005A, You don't have to remember to flip 6005, and 6005B respectively at $19.95 for the switch after 14 to 16 hours, Auto- the short shaft gearbox. They are 6015A, Trickle does It for you. Once you've 6015, and 6015B respectively at $25 for the hooked the batteries up to the long shaft gearbox. charger, you can As said, the motor is a beauty, with a forget about black aluminum front bell, replaceable them brushes, and adjustable timing. It is avail­ s f - 1 able in 24 turn (black label) or 19 turn (gold label) versions. The 19 turn is hot! The SILK ■ $9.75 per yd. motors are $40 with no gearbox, $60 with Pure imported first quality Japanese silk. the short gearbox, and $65 with the long Every inch closely woven tor extra strength or m o n e y b ack until gearbox. Put this together with a six or 9 attractive colors cut to any length: seven-cell Sanyo SCR pack, and watch out! white, red. yellow, royal, orange, you are You will get very close to cobalt per­ blue, green, purple, black ready to go out formance! The Leisure stock motor (red again, whether it's two days or two months later! Talk about a label) is also very good. It is $22 direct Free swatch available on request. drive, and $40 with either the short or long ‘ set 'em. forget 'em* system! Model Covering Company Auto-Trickle can be gearbox, a real bargain! 2320 Ocean Parkway. Brooklyn, NY 11223 Now for news from readers! John (718) 375-1288 incorporated Into any dual output Mountjoy has contributed many photos charger that uses the standard and handy items to this column and now Super Micro four-channel radio. John re­ overnight charge he and his friend Charlie Spear will be the commends the plane for advanced fliers, rate. co-editors for the electric column in R/C as it is very fast and aerobatic. It will not Report. R/C Report is sold in many hobby take off from grass but does good takeoffs 34K20C Ace stores, it is a tabloid format magazine which from pavement. John’s description is typi­ Auto- features very good product reports and cal of many fliers who have the P-68. It is a Trickle, columns. The price has been $1.25 per is­ very hot plane. You can tame it down by asbld. sue, or $10 a year, but I think this has gone adding wingspan; I have seen this done $29.95 up. The address is R/C Report, P.O. Box quite often. If I were building one, I would 1706, Huntsville, Alabama 35807. Anyhow, build two wings, one with the stock airfoil the photo is of John’s Astro Flight Parte- (which is quite thin), and one with a 12% navia P-68. This kit has been in production thick airfoil. I think the 12% airfoil would for many years and is the only electric twin tame it down quite a bit and give more lift. scale kit that I know of. John powered his John is using small wheels on his; I think A C E R /C with twin Astro cobalt 05 motors, 8x4.5 larger wheels would make it capable of 116W. 19th Si, P.O.Box 51112, Higginsville MO props, 14 Sanyo 900 SCRs, and a Robart 500 grass takeoffs. There is certainly no power 64037 (816)584-7121 FAX (816) 584-7766 speed controller. Flying weight is 4 lbs., 2 problem, twin cobalts are potent! Thanks, Complete Catalog $2.00 oz, which is very good. He used a Cannon John, for the info and welcome to the

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL B U IL D E R SENT YOU! 73 and the Boeing Hawks will have their seventh annual Electric Fly-In this June 24 and 25, at the Hawks flying field in Kent, Washington. There will be a prize for the Simple to build __ e|d | best multi-motor plane flown each day, and a Class A battery allotment sailplane event (three flights on one charge). There Simple to fly will be prizes for most aerobatic, best scale, longest flight, most impressive, and others! AMA membership is required. Write to GMP’s new low cost makes the R/C Challenge affordable Bernard Cawley, 29838 48th Ave S., Au­ burn, Washington 98001, phone (206) THE CHALLENGE MADE AFFORDABLE 839-9157 for more information. Today's R/C Helicopters, w ith autorotation, special engines, The Burlington County Club in New hi-tech rotor heads and expensive radios have all but forgot­ Jersey will have their first annual Electric ten the entry level modeller. How about the fixed wing flier Fly July 8,1989. Flying will be at the Northern w ith the ever popular 40 size engine to spare? GMP believes the time has come to bring the R/C challenge to a wider Burlington County Regional High School. group. GMP has developed REBEL - a simple, yet durable 40 Call Bob Afflerback at (609)871-8777 or powered helicopter which can use a standard airplane en­ write him at 123 Harrington Circle, Will- gine and radio. ingboro. New Jersey 08046 for further SIMPLE DESIGN - EASY TO FLY information. Till next time, have a good Rebel is easy to fly and also a snap to assemble. Besides time with electrics! · the Rebel's illustrated instruction manual. GMP will have available a low cost, over the shoulder step-by-step Building Setting up and How to fly video. Free Flight. . . Continued from page 59 HIGH GRADE RUGGED CONSTRUCTION no grain, so cutting accurately is easy. U.S. O U TD O O R F/F CHAMPIONSHIPS Rebel has many more ball bearings than other R/C helicop­ ters in it's price range. It's tough to wear out or damage. It I just received a press release from Tony features black anodized aluminum parts and a very simple Italiano to publicize the upcoming NFFS new space ege plastic rotor head yoke. Rebel's total parts sponsored U.S. Outdoor F/F Champion­ count and spare part prices are the lowest in the industry. ships which are scheduled to be held June - 19-23,1989 at Lawrenceville, Illinois at the Try the helicopter challenge RUN WITH A REBEL! Mid American Air Center. Sixty-one events are on the schedule, including AM A, Nostalgia, SAM, and Fly­ ing Aces Scale. Dorms are available and two banquets are on the schedule. The event is intended for families, not just the F/F freaks. For more information, contact Tony Italiano at 1655 Revere Dr.. Brook­ field, Wisconsin 53005. THAT'S IT DEPT. Well, that kind of wraps it up for another month. Thanks for reading along again. Let me know how your free flight experiences are treating you. Send me pictures, and if you are at the Nats, I will be there com­ peting with my models and my camera. Look me up. So, until next month, catch a thermal for me. ·

Tech Stuff . .. Continued from page 31 Taking R/C Helicopter Flying to New Heights! wish for anything more. Full-scale seaplane CORIIAM MOI1F.I. PRODUCTS, INC (818) 992 0195 designers have to worry about something 23%I Craftsman Rd, CalabasasCA 91302 FAX 8187020117 called Froude Number, which has to do with wave-making drag, and velocity squared divided by hull length; but we ranks of magazine columnists. Those HiLine (P.O. Box 341283, Bethesda, Mary­ usually have a better power-to-weight ratio monthly deadlines always seem to be two land 20817). In keeping with the idea that than tlie big guys. Some of you never heard days ago! wattage tells you more, I rate the old 020 of the hump, so why did I tell you what it jack Dobbins sent a lot of info on his motors as nominal 40 watts. This usually was and then tell you don’t have to worry small electrics, enough to be the topic of a means three to six cells at 12 to 6 amps about it? separate column. The photos show his mini range. Anyhow, I dusted off my Electro The Step Showmaster, a scaled-down Ken Willard Flea design (first flew in 1976) and installed The step is of course what permits our design, and his electric powered hand the HiLine IMP 30 motor in it, with a 5-1/4x3 displacement boat to climb out and be­ launch size glider. Small airplanes are a Top Flite nylon prop. Flying weight was 12 come a planing boat, and in turn lift off blast, and his letter came just at the right ounces, and to say the least, I was very and become a flying boat. Just before liftoff time. I have designed many small electrics, pleased with the performance. Flights are 4 or just after landing, the plane is partly and I was about to publish some of them to 5 minutes long with a very good climb. supported by hydrodynamic lift and bal­ when Astro discontinued the 020! That put The plane has to dive to do loops, and anced on a very small area of bottom just everything on hold. However, now there spins are very good. I recommend the IMP ahead of the step. Therefore it is evident are some very good replacements for the 30, it is only $10.95 plus $2 postage from that the step must be close to the CG. Astro 020, including the Kyosho AP-29, the HiLine. There will be more in the column Normally the step is placed at or just behind Silver Streak motor from Peck-Polymers, about small planes next time. the CG. If the step is too far forward the and the smallest of the lot, the IMP 30 from The Puget Sound Electric Model Fliers plane will bounceand porpoise. If the step

74 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! MODELBUILDER DC AMPERES

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Charge the Big Ones Fast The Astro Model 112 DC/DC charger is specially voltage jacks are provided on the front panel, so you designed to charge BIG ELECTRIC SYSTEMS FAST. can monitor the charging process with your digital No more waiting around for hours trying to charge voltmeter. the twenty eight cells in your Quarter Scale Cub. No DC/DC CHARGER COMPARISON more removing the wing to take out the four battery Maximum Να of Cells Charging Time packs so you can charge them one at a time. Now you can charge all twenty eight cells (44 volts) at the same time. Just plug the astro Model 112 into the charging jack on the side of your model, set the timer for fifteen minutes and relax. Our high power precision electronics will do the work. For versatility the Astro Model 112 can't be beat. It can charge any nicad battery with as few as one cell or as many as twenty eight cells. And the Constant Amp Charging Circuit is adjustable from one to five amps, so you can safely charge 250 and 500ma receiver packs, 900 and 1200ma airplane packs, and 4000ma boat and truck packs. The Astro Model 112 charges them all faster and more efficiently. The reason is simple, our super heavy duty DC/DC in­ verter puts out more juice. The proof is right there on the meter. You will appreciate another little feature. The input cord is both fused and diode protected so if in haste you were to inadvertantly hook up the alligator cord backwards nothing would get fried. Just pop in a new 20 amp fuse and you're back in business. Also,

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL'EM MODEL BUILDER SENT YOU! 75 than a true bottom. As long as this aft buoyant area has straight longitudinal lines, there is little or no suction to retard getting up on the step. SCALE WHEELS Pointed Bows RADIO CONTROL · CONTROL-UNE · FREE-FLIGHT Most floats and hulls have a fairly blunt bow. For model seaplanes a moderately sharp or pointed bow makes more sense. Four reasons: less aerodynamic drag; less hydrodynamic drag in very rough water; the forward deck can be made lower per­ mitting the prop and the thrust line to be lower; and, in a crash the sharp bow can penetrate the water at a lower force, de­ creasing the water impact Gs and thereby 0ΟVINTAGE SMOOTH ΘGOLDEN AGE 0 reducing potential crash damage. Which NEW will enter the water with less drag, a javelin sizes: 2’/," CONTOUR sizes: 2 i/," BALLOON or a basketball? You may also like the looks 3*/*" 2V«" 4 %" V " 3 Vi" of sharper bows. I do. 1 " 31/4 " 1 2Vi" 4Vi" 1" 3V4" " 3*4" With regard to a low forward deck, the l'/«" ♦%" 1 ‘Λ" 3V4” 1*4" 4J/i" 3 Vi" 51/4" depth of the hull at the prop on XI is only IV," 5" 1 >/," 4V," 1 V2 " 5” 3y," 2.5 inches. On a typical design flying boat I 7/." 6 s/.” 2>/i" 5 Vi" 1 7/." 6 V2 " of this size the depth is about 4.8 inches, SCALE PILOTS · CYLINDERS · ENGINE KITS nearly twice as much. This flat nose may MACHINE GUN KITS · PLASTIC DISPLAY MODELS look strange because we are not used to it, but it allows the thrust line to be 2.3 inches SEND $3 FOR COMPLETE ILLUSTRATED CATALOG lower, for better performance and aero­ * ____ »*Q |. INC~ DEPT. MB >181 PAWNEE ST.. SAN MARCOS, CA. · 92069 batics. Rotation Rotation, for the younger members of the class, is the elevator-commanded ro­ MAP Argus Plans & Drawings tation of the plane about the pitch axis, after flying speed is reached, to bring the Plans Free flight plans-vintage, scale, competition & gliders. wing to a sufficiently positive angle of at­ Handbook U-Control plans-vintage, scale & competition. tack so the wing lift will support the weight One R/C aircraft plans-scale, competition, sport & gliders. of the airplane for takeoff. The amount of rotation required depends on the speed at Plans Boat plans-sport, power, sail, competition, yachts & steam. which we want to take off. When the angle Handbook Car plans. of attack rises to the point where the lift at Two Plans for steam, petrol & traction engines. Locomotives, the existing velocity equals the weight, up buildings, cannons & clocks. it goes. The maximum possible rotation Plans angle for a given seaplane design is ap­ Handbook Scale drawings of military, civil, private & light aircraft, proximately the angle between the main Three as well as scale drawings of military vehicles. bottom of the hull or floats and a line from Every type of plan for the scratch builder. All ______the tip of the main step to the tip of the catalogs $3.00 each, or all 3 for $7.50. Spec­ rear step, tail float, or fuselage. This is often J.M. LUPPERGER PLANS called the "sternpost angle.” It needs to be ify catalog desired, and make your check pay 1304 Palm Avenue able to J.M. Lupperger Plans. California resi­ at least six degrees. If it is more than ten Huntington Beach, CA 92648 degrees or so, the plane will still operate dents add 6% tax. Allow 2 - 4 wks delivery. fine, but it will be possible to horse the plane off at excessive angles of attack, is too far aft, excessive elevator will be though the CC was at 29%. After Paul Wes­ which may invite a stall. In other words, required for liftoff, or the plane can’t take ton and I realized that hull aerodynamic limiting the rotation angle in the design of off at all. lift was the source of the problem, I moved the airplane prevents inexperienced or In conventional seaplane design, the the CG forward to 19 or 20% of mean wing careless pilots from snap rolling on takeoff. step must be high enough and/or venti­ chord, and it now flies beautifully. Tradi­ The sternpost angle also affects landings. lated, to assure that the water breaks away tional flying boats usually balance normal­ When this angle is too low, in a well-flared from the after bottom cleanly, for low-drag ly, because they are as wide behind the landing the aft buoyant area will touch the pure planing. We are making the rear of step as they are in front of it, so the hull lift water first, pitching the plane abruptly the fuselage or the after bottom rounded is roughly at the CG. This rather unusual down onto the main bottom. If the stern- in cross section so our step is very well design is much wider forward than it is post angle is high enough, it will be possi­ ventilated. The simplest steps and transoms behind the step, however, putting the hull ble to completely stall the plane yet touch are straight across and vertical, but they lift well ahead of the wing lift. Watch for it down simultaneously fore and aft for a have high aerodynamic drag. We can make in any seaplanes you design or fly. "three-point" landing. them elliptical or vee-shaped in planform, Afterbody Wing Incidence vs. Bottom Angle to reduce the drag without losing much if Most floatplanes and flying boats have a When a seaplane first passes the hump, anything hydrodynamically. flat or vee bottom aft of the main step, and its weight is supported by the hydrody­ Hull Aerodynamic Lift a rear step at the intersection of this aft namic lift on the planing bottom. As it In a landplane the fuselage normally has bottom and the aft fuselage. We have accelerates, less and less bottom area is little effect on the center of lift of the air­ demonstrated, at least on models, that an required to support the weight, and the plane, but in flying boats things may be after bottom as such is completely un­ plane rises further out of the water until it different. A large wide hull sticking way necessary. We do need some buoyancy is supported only by a small area next to ahead of the center of gravity will have lift! behind the main step, as we have already the step. We want the wing lift during this I originally didn't take hull lift into account discussed, but a normal rounded cross- time to be zero or close to it, because the in balancing Sea Fli XI. On the first test section aft fuselage can provide that with drag is least at zero lift, and also there will flight it was obviously too tail heavy even less weight, less drag and less design effort be no danger of taking off half stalled. The

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most efficient planing angle for a flat sur­ move, the rounded lower surface will mamish Parkway N., Redmond, Washing­ face is plus three or four degrees, therefore cause downward "lift” in the water which ton 98052, SASE please. (206)885-2647. · the wing incidence should be such that the will tend to suck the wing down. We could planing bottom is around four degrees put a step all along the underside of the Pattern...... Continued from page 27 when the wing is developing little or no lift wing and solve that problem, but the loss either up or down. Since this is an aerobatic in aerodynamic lift and the increase in drag plished. model with a symmetrical section. I’m us­ would be completely unacceptable. How You may or may not agree. I hope you ing zero decalage. The stab angle is there­ much wing float volume do we need? Too don’t think I am simply trying to stir up a fore also zero degrees when the bottom is little and we will catch a wing in the water change for my own interest. I simply see at plus four, and no elevator deflection is sometimes. Too much and we will be car­ this change as all but inevitable. If not now, required to keep the ship at optimum rying unnecessary weight and drag, but in the very near future. planing angle (provided we put the step in since we aren’t smart enough to know If it does occur, what would be the effect the right place with respect to the CG). exactly, we should err on the high side. A on safety? On noise? The size of the "box” As soon as we have plenty of flying little loss in flying performance isn’t as bad we fly prevents very fast models from being speed, a touch of up elevator rotates the as tricky habits on the water. effective. Also, the weight limit, which is plane enough to smoothly transfer the Also, there is the question of where to still 11 lbs. dry, keeps inertia to reasonable weight from the step to the wing. In actual put the wing floats. Too far in toward the limits. The noise rules are the most likely practice, if we have the elevator trimmed center (short moment arm, Nov. ’83) and rules to govern preferred engines. I say this for a slight climb hands off, no elevator the wing floats will have to be large, but because I expect these rules to change as input is necessary at liftoff. The wing will the farther out we put them on the wing, community needs dictate. gradually lift the load and it will take off the stronger and therefore heavier the Simply put, I see nothing to stop this unaided when the speed gets high enough. wing must be built to withstand the twist­ change except for the personal interests of Only if we wish to take off at a lower veloc­ ing loads the wing floats will impose on it. some fliers. ity do we need some elevator. If a seaplane Also, wing floats that are way out may have Larger engines are presently available needs up elevator to get it unstuck from a tendency to cause ground looping (sea which could fill the bill. For instance, the the water, something is wrong with the looping?). S.T. .90, Webra .80, Rossi .80 and .90, O.S. design. And it doesn’t take more power to There is much that we have not covered .90 and 1.08, O.S. 1.6 twin four-cycle and get seaplanes off; if the design is right they in configuring this airplane, but again I’ve others of similar size and types. lift off easily. It's enough to warm the used up my allotted space. Next month we Swell! Now we all have a fortune tied up cockles of me heart. will finish up the design of Sea Fli XI by in super pumper .60 engines and Son of Wing Floats discussing the materials, processes, and Godzilla models! What do we do with We will have to provide wing floats, structural aspects of the model. Also I will them? sponsons, or some other form of lateral try to put composite construction into per­ Fly them. They are expendable if you are buoyancy to keep the wings out of the spective. Meanwhile, if you don't make an active competitor and if they were really water at all times. If you haven’t thought waves, you are not under way. Designers any good in the first place, they may still be about it or experienced it, if a wing touches and seaplanes make waves. entirely competitive for years to come. the water while it is moving or starting to Francis Reynolds, 3060 W. Lake Sam­ Let's face it, change is a normal part of

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! 77 today’s world. In some businesses your P&P. With almost no paid advertising, these thoughts are obsolete as soon as you speak writers managed to spread the news of them! P&P to a remarkably wide audience. Simi­ Enough of that. I have included some larly, model club newsletters picked up photos of a new transmitter tray I call the the ball and ran with it, further expanding “ Microtray.” It is intended to allow access the network of contributors and readers. to the top of the transmitter as well as The eventual result was Volume 3 (1988), provide storage for your personal items which showcased work from model build­ you may need to keep with you. We have ers in Australia, Belgium, Canada, Czecho­ found it to be quite handy and we simply slovakia, England, France, Germany, drop the transmitter onto the Velcro points Greece, Japan and Uruguay, as well as the and away we go. United States. This underlines the truly in­ The little charger shown by our Galaxy ternational aspects of this tiny spectrum of Learn from the pros at Top Flite! radio is a McDaniel unit hooked up to ten our hobby!” Step-by-step MONOKOTE' application 1200 mAh Ni-Cds. This gives us a couple of By way of review, Vol. 1 featured five details in clear, easy-to-follow, full-color refills at the flight line if we are really burn­ Pistachio-sized drawings; Vol. 2 had four close up action! Winss. Fuselage. Trims. ing up the fuel. The digital meter in the 3-views plus two actual construction plans; Color-on-color. Designs. Hinging. Basic transmitter tray monitors any of the battery Vol. 3 incorporated one 3-view, data on through advanced heat gun and iron packs to .01 volts. · three racers, one Pistachio plan and two usage techniques. Peanut plans. Now Vol. 4 (Feb. 1989) pre­ (Each tape approximately 1 hour). sents one Peanut and two Pistachio plans, Insiders...... Continued from page 60 "MONOKOTE Γ and five different 3-views. It also has fea­ Basics on Wings, Tail Sections, Fuselages, travel, as Aronstein did when he returned tures such as Peanut & Pistachio People, Hinging, Color Schemes and Trimming. to Washington after his victory. Peanut Gallery, Pistachio Presentation, P&P “MONOKOTE* II" By the way, we built one and it flies Props, and much more. Advanced Color Schemes, Designs, Wing great, even though ours came out heavier To get your copy of Volume 4 of Peanuts Tips, Multi-Color Combos, and MORE! than the original. & Pistachios, send a check or M.O. for "MONOKOTE III” PEANUTS & PISTACHIOS VOL. 4 $5.50 plus $1.50 for postage to: Hannan’s Airframe Prep, Advanced Wing Tips, More When we asked P&P author Bill Hannan Runway, Box A, Escondido, California on Hinging, Color-on-Color, Graphics, how he got all the way to Volume 4 with his 92025. · Painting, and MORE! great series of booklets about tiny and “MONOKOTE* IV” ultra-tiny stick ‘n’ tissue flying models, here Nuremberg . . . Continued from page 15 More on Wing Tips, Canopy Covering, was his profound reply: Advanced Graphics, Striping, Car Bodies, “ P&P Vol. 1 was originated as an effort to be available in the average retail shop and and MORE! consolidate the activities of a small-in­ not exclusively through specialist retailers. “MONOKOTE* V number but large-in-enthusiasm group of This will further boost the interest for high- Detailing Chrome, Scale Tips, Concave geographically wide-spaced modelers. quality electric flight products. The first Surfaces, Fragile Wing Tips, and MORE! Most were individuals who were con­ production batch, started early February, is structing and flying tiny scale models, un­ of 2,000 pieces for most types and sizes. aware that their rather odd interests were Much more than the previous series! shared by many others in other parts of the As if that is not all, the new Robbe/Keller world. As a result of my Model Builder range includes many motors with neo- column, 'Hannan’s Hangar,’ and my pre­ dyme magnets. This is a new and very vious ‘Peanut Power’ publication, I got promising technology. The recently de­ letters from all over the world expressing veloped iron-boron-neodyme magnets are fascination with the fine art of producing significantly more powerful than sama­ realistic fliers in miniature. Because of rium-cobalt ones, but the technology is space limits in the magazine, photos were still very new and difficult to master, due to arriving in quantities greater than I could temperature limitations. Although other publish. Further, the high cost of produc­ manufacturers like Geist and Hecktoplett ing comprehensive books such as 'Peanut are already experimenting with neodyme GREAT FOR CLUB MEETINGS! Power,’ which could feature large numbers motors, Keller is the first to start full-scale RENT OR BUY! of photos, placed them beyond the reach production in the model field. Very of a one-man, part time publishing ven­ exciting! $39.95 each ture. Further, the time investment required WHAT FUTURE? ($20 Refund per tape on Rentals, if made the concept impractical. After four days spent inside the exhibi­ returned undamaged within 30 days.) "Thus, 'Peanuts & Pistachios,’ a concise tion halls, and with little time to search Please specify I, II, III, IV, or V with order. booklet, was envisioned as a practical through more halls for small or new model SPECIAL PURCHASE - ONLY solution to an apparent need that could be exhibitors lost amidst toy specialities, I left COMBO OFFER filled within reasonable time and financing Nuremberg with the feeling that European Combination 2-hour long tapes constraints. Volume 1 (1986) was launched modeling had just taken one of its most (Specify I & II or III & IV) as a sort of ‘test balloon' to sound out significant turns. There is little doubt that Only $65 each! Save $14.90! potential reception. Produced at relatively the days of free and wide flying fields are (Sorry, no rentals available low cost in small quantity, it quickly estab­ things of the past. Modeling can only keep on Combo tapes) lished that there were modelers out there growing if one can fly models within a Send check or M.O. with Name, Full willing to contribute to and help support reasonable distance from town, where the Address and choice of VHS or BETA such a publication. However, it also con­ activity can be seen by the general public. format to: firmed that this was a very special area of Not only do large distances deter people interest, and initial market response was from flying regularly, but our activity be­ small. comes hidden from anybody but the most "Still, letters from those who bought this determined modelers. Electrics may be the TOP FLITE MODELS, INC. booklet were encouraging, and about a clue for a better public acceptance, away Monokote Video Course year later, Volume 2 (1987) appeared. An­ from the usual nuisances. 2635 S. Wabash Ave. other vital factor was the boost provided I do not mean that modeling will be Chicago, IL 60616 by the model magazine editors and col­ totally electric. Certainly not, and the umnists, who were so generous in praising combustion engines retain the same ap-

78 MODEL BUILDER peal as before to many modelers. But when the need arises to fly silent models, electric JEDS SHADE CANOP/ES power is now a viable alternative and many discover that it is, also, most enjoyable. · 643& Brookhurst Rd. w s j riry ρη 4) 773.9509 S t i n s o n ...... Continued from page 47 to shape. Reinforcing dowels help secure Rat Roof the two nacelles to this assembly after it’s been installed in the fuselage. Peak (Hip) Roof INBOARD/OUTBOARD NACELLES Carport Cut the cores from 1/8 ply, bend the landing gear struts to shape and lash them to the cores with copper wire. The cores COMPACT EASV are faced on both sides with 3/16 balsa sheet for a total thickness of 1/2 inch. Drill STORAGE DP k k k recesses for the joiner dowels, then make ■kirk PORTABLE F and add the firewall/fairing units if you E A S y R choose the off-center engine mounting. Take Add the L.G. strut fairings and profile wheel HEAVY DUTY DO iYH E pants. STEEL FITTINGS It E FUSELAGE *** Anywhere Trace the pattern and cut from a plank of 1/2-inch medium balsa. The bellcrank EXTRA STRONG installation is about the only item here that One person isn’t straightforward. The method isn’t GALVANIZED STEEL TUBING setup original, and for that reason works very well. It’s easier to refer you to the drawing m zC st or write for free brochuret than to try explaining the assembly. As with the wing, personal preference was to apply the finish prior to assembly. Yes, there’s some touch-up required after ^Challenger 3 3 9 ■ 95 j p OLD TIME STUNT - LEGAL ψ BASED UPPON TH E ORIGINAL installing the flying surfaces, but try to designed by: B i l l N o y e s BER K ELEY KIT. imagine applying those "windows" and all that striping while reaching through, over, A 'FULL STUNT' profile model kit and around everything else. AREA 587 SO.IN. .35 to .45 ENGINE SPAN 52 IN. TAIL SURFACES The fin/rudder is 1/4-inch balsa sheet, S S ^ 7 with simulated ribs from thin strips of MonoKote under the paint. The stab and elevators are built up, using a core of 1/16 IL to fl) Ed SoutriMlck. Ted Fincher. ’SUPER’ ZILCH designed by: Jim S a f t ig sheet cut to outline and faced on both trieother· Vlntape flow Stuntthe kit Cnaeplonanipa. prototype at sides with 1/8 squares and 1/8sheet curved Khittler KarroMO. Ce.. FeP.. 18W 1947 Vintage 496 s q . in . outlines. These surfaces were purposely .2 9 -,4 5 GLOH .3 5 - .6 5 IGNITION $ 4 5 .9 5 built to 5/16-inch thickness so that after sanding they’d be 1/4-inch thick at the GALAXIE MODEL COMPANY 1947 ' L I L ' Z ILC H $ 3 2 .5 0 Box 4842. Covina. Ca. 91723 hinge line. Block-sand to final shape; Dealer inquires invited tapered at the tips and a slight symmetrical (8181 9 6 7 -0 07 4 airfoil. The horizontal tail surfaces were covered with Japanese tissue and lightly tail surfaces. Fuselage and nacelles received and touched-up with paint and brush, then shrunk with a fine mist of rubbing alcohol. three coats of Sig nitrate, followed by two the entire model received a brushed-on Thin (50/50) dope is applied until the sur­ sprayed coats of Black Baron primer and coat of clear gloss polyurethane. Install faces are sealed and shiny. We used ten two coats of color. Fuselage decorations controls, remembering to add a pushrod coats of Sig nitrate. Why nitrate? With are from MonoKote trim: windows are guide/support. Add details as desired. We epoxy as a final finish (ours is), the base light blue, while the stripes were masked installed dummy nav lights, aileron push- must be nitrate. We’re not sure what hap­ off on a white trim sheet (sticky-back), rods, exhaust pipes, antenna wire and stab pens if you use butyrate under epoxy . . . sprayed with orange epoxy, then cut out brace wires. It’s easy to get carried away although we’ve heard that the appearance leaving about a 1/32-inch border all here, but it’s well worth it. will resemble a soggy pizza. Stab struts are around. The same method was used on FLYING 1/16x1/8 spruce, bass, pine, or whatever. the nacelles and wheel pants.The front end As C/L Scale judges are seldom im­ The main wing struts are 3/8-inch K&S of all three "cowlings” are painted and pressed by Hammerhead Stalls on takeoff, streamlined aluminum tubing. Cut these outlined with striping tape; only the hori­ be sure to balance the model where to length, insert plugs of balsa/wire for zontal stripes are MonoKote. shown. The original was flown on 40 feet of attachments and apply the finish before The AA logos were made by carefully .010 solid wires. Engine starting sequence installing. Jury struts are 1/16-inch alumi­ cutting them from MonoKote. This is sort is; outboard, inboard, center. For reasons num tubing. of tedious, but rewarding. Use a new #11 that should be obvious, you don’t want the FINISHING blade for this. Dry transfer (rub-on) white outboard engine running in flight when We nearly went with a 1930s era cream letters were used for the wording above the others have stopped. This isn’t a three- and green scheme for a fictitious "Fubar the logos and for the registration numbers engine Mouse Racer, so let it have a long Airlines,” but wound up following the herd on the rudder. We used Letratype 30 pt. takeoff roll to gain flying speed, then ease and applied the AA scheme. Colors are Helvetica Fine. These should be available it off. The sound of multi-engines is like dark blue and international orange with at any good art supply house. Wing regis­ music. On landing, don’t let it balloon, but white pinstriping. The original’s wing and tration numbers and AA markings are 3- do allow it to glide down to a tail-high sesquiplane were covered with Black Baron inch press-ons from Major Decals. touchdown—gently. We think you’ll be film. These were then sprayed with Black Following assembly of all components, hooked on Multi-Engine Profile Scalers. Baron epoxy, as were the tissue covered small fillets of 5-min. epoxy were added Much thanks to Dave Shipton for his

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! 79 and other four-cycle engines. «“ L 1989 SUPER-MICRO & NOVA Since I’m a firm believer in castor oil’s superior lubricating properties, I chose to WORLD'S SMALLEST R/C SYSTEMS- NOWbreak AVAILABLE! in and run the YS-120 on Don Nix’s MADE New 910 Transmitter has servo reversing, end Powermaster Plus commercial fuel (whose IN point adjustments, lite-touch sticks, optional oil is 30% castor and 70% synthetic) with U S A dual rate & mixer circuits. Tx with Gold Sticker 15% nitro. Powermaster Plus meets the YS meets new AMA specs. specs nicely. Steve Helms at Futaba sug­ New Super-Micro Rx, still smallest, & Super- gests staying away from "four-cycle fuels,” Nova Rx, the most versatile, are Narrow- since they normally have lower total oil Banded on new freqs. & work on 1991 20 KHz contents. Narrow Band spacing. Super-Micro servos, now .43 oz., are tougher, faster than ever. YS recommends either an O.S. “ F” glow Available separately - $43.95 plug or an Enya #3 plug, but neither is supplied. Although this engine comes with MICRO SYSTEM PRICES (72 MHZ) four Allen wrenches, two prop wrenches, and a tappet adjusting wrench, I do feel it 2 CH. (2.37 OZ.) MSM910-22A $241.95 should come with a proper glow plug. The 3 CH. (2.81 OZ.) MSM910-33A $286.95 Fox Miracle plug worked just fine through break-in and all testing. When I later de­ 4 CH. (3.25 OZ.) MSM910-44A $332.95 cided to purposely run the engine too lean 1989 Narrow-Banded SUPER-NOVA on the 16x8 prop (lean runs advance tim­ and Charlie's CLASSIC Systems are 5 CH. (3.25 OZ.) MSM910-54A $343.95 both slightly larger, at lower cost. ing) to see if the prop would kick off, the Please write for newest brochures. TX DUAL RATES $15.00 MIXER $39.95 prop did kick off and the plug also failed— as expected. Ship: Sys. $9.50, Flite Paks $7.50; Servos, Rx $5.50. Calif The complete fuel flow sequence is: add Sales Tax. COD’s 20% deposit. Catalog $1.00 U.S., 1. Fuel flows from the tank, past a filter, $2.50 Foreign. CASH PRICES shown, CARDS add 5%. to the regulator. 2828 Cochran St., Suite 281 Simi Valley. Ca. 93065 FAX 8055279114 (CE) (805) 581-5061 2. Fuel enters the regulator's lower chamber, below the soft silicone dia­ phragm. 3. Fuel collects at/around the spring, plunger, and the internal one-way check I M W I I S S T f valve that the plunger operates. COLLEGE OF GLUE KNOWLEDGE 4. As the crankshaft turns, it momen­ tarily releases timed crankcase pressure (maybe as much as 8 to 10 pounds per Z-Ends square inch at peak rpm) into the regu­ An extending reach, slick tip for Zap glues. lator’s upper chamber and onto the top Allows you to get Into hard-to-reach areas. Comes packed with 10 Z-Ends and a 12 surface of the diaphragm. coil of special micro dropper tubing in a 5. This pressure escapes by a one-way neat little reusable clear plastic container. check valve into the fuel tank where it rises Use the micro dropper tubing on Zap CA. above atmospheric to force out fuel. Be­ Plasti Zap, and High Strength Zap Lock. Use the Z-Ends on other products. fore the pressure escapes it pushes down on the diaphragm and on the plunger be­ low the diaphragm. The plunger releases Prof. Sticky VonShtuck Pacer Tech. Campbell CA fuel from the bottom of the regulator by opening an internal one-way check valve. help and advice on this project. For anyone The needle valve sets the mixture above The fuel flows to the needle valve for wanting to discuss this design further, we’re idle and is very insensitive. This isn’t fuel metering. at 6618 Dashwood St., Lakewood, Cali­ injection, but the system works flawlessly, 6. The fuel is fed under pressure past fornia 90713. · so if Yamada wants to call it “fuel injection,” the restriction caused by the needle valve’s again I think we should accept their term. setting and into a tiny hole in the carb Inside Engines . . . . Cont. from page 39 The dual throats in the carburetor are a casting, into a bathtub shaped milled entry whopping big .430-inch diameter and the on the surface of the rotating blade/vane, tually made the car fun to drive!) Yamada intake pipe necks down to .390-inch and simply dumps into the incoming air- has cleverly engineered a way to slightly probably to accelerate the mixture a bit. stream at full throttle. There is no spray bar, increase (about a third of an atmosphere) Such large I.D.s would never satisfactorily no venturi, and no injector nozzle—fuel the pressure of air going past this engine’s draw fuel from the tank by normal venturi just dumps into the incoming airstream. intake valve and they want to call it action. The variable pressurization system 7. At less than full throttle the fuel flows “ supercharging." I think we should accept allows steady engine running regardless of into a continually narrowing width/depth their term. the dynamics and flight attitude of the metering channel so that less fuel flows at I described fuel injection earlier. The model. Raising and lowering the fuel tank lower rpm. There’s even an auxiliary fuel YS-120 doesn’t have fuel injection in the a foot from center does not affect the en­ flow path leading to the throat nearest the normal sense. The pressurized fuel system gine performance! Our models can now needle valve. does deliver fuel to the carburetor under have working tip tanks for R/C scale! I’m sure that a massive volume of Orien­ pressure above atmospheric due to the I doubt this engine design will ever have tal patience, some trial and error, and much positive air pressure inside the fuel tank. premature failure of the shaft’s ball bear­ clever and ingenious engineering was re­ The needle valve sets the rate of fuel flow. ings due to nitrous oxide from combustion quired to perfect the fuel feed system. The throttle servo operates a dual vane or joining with moisture to form nitric acid This YS-120 uses a nickel plated brass blade that passes through the dual car­ which just loves to eat steel. With all the cylinder. The aluminum piston has one buretor throats. Like true fuel injection, intake fuel/air passing through the crank­ compression ring. The intake valve (14mm) there is no venturi in the fuel feed system. case (just like a rear intake two-cycle en­ is slightly larger than the exhaust valve The dual blade sets the engine’s speed; gine) that section runs both cleaner and (12mm) and the glow plug is offset towards idle mixture is set by minor turning of the cooler than any other four-stroke model the hotter exhaust side of the combustion slotted brass adjuster which varies com­ engine. This feature alone virtually nullifies chamber. The one-piece valve guide and pression on the spring in the regulator. the price differential between the YS-120 seat is phosphor bronze. Mechanically

80 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER ■ \ THERMAL CHARGER

If what you are looking for in an electric sailplane is, good looks, easy to build, fun to fly, and great performance, Thermal Charger is the one for you. Wing Span 60 Inches Wing Area 545 Sq. Inches Motor (Included) Leisure .05 Electric

p r e c is io n l l f l PRODUCTS INC. (714) 592-5144 510 E. Arrow Highway. San Dimas, CA 91775 V -/

advantaged rocker arms give .120 inch (al­ most 1/8 inch) valve travel. A double set of (-All O A CC· When your equipment fails, metric prop nuts with a peculiar off-center ■ #% IL w#%· E ■ Ram keeps your models safe! shoulder between them side-loads the crankshaft’s threads to help prevent the # R E D 09 Battery Backer (redundant Rx. battery system ) $39.95 prop from kicking off. It's too bad stop # R E D 10 Dual Servo Setter (auto, controls 2 servos) $39.95 nuts (those with nylon inserts) aren’t made # R E D 11 Audio Battery Alarm (monitors 4.8 or 9.6 volts) $19.95 in metric sizes since they work so well to # R E D 17 Transmitter Switch Alarm (beeps when Tx. is “O N I $19.95 keep the prop in place. # R E D 18 Big Airplane RF De-Glitcher (kills long wire RF) $ 8.95 # R E D 25 Big Model Battery Backer (/* scale version of 09) $49.95 It is a bit difficult to describe how nice # RED 32 Battery Peak Detector (protects R/C car battery) $29.95 handling this engine proved to be. As you study the all-important speed ratio figures #RED 37 Simple Servo Setter (auto, controls 1 servo) $19.95 (nothing is worse than an engine whose THE ORIGINALS... Still the best! idle speed is so fast that touch-and-go • SEE YOUR DEALER · SEND STAMPED ENVELOPE FOR RAM INFO If unavailable locally, send check, money order or full credit card info for the cost of the item plus maneuvers and landings are crashes look­ $2.00 ($5.00 foreign) for immediate shipment. Include full address for U.P.S. Sorry no C.O.D. ing to happen) you’ll see the best per­ formance was on the smaller props. This is « R a m 4736 N. Milwaukee Ave. — Chicago, IL 60630 a function of the exhaust timing favoring smaller props turning at higher rpm—yet the idle speeds varied considerably less than I expected from the smallest to the P.A.W. DIESELS largest test props. The 13x6 prop idled beau­ tifully at 2,000 rpm and when I added a ■049 TO -35, RC& STD Davis Diesel SM-4 muffler it dropped to a BinaoNAL & MUNOIY iinvici reliable 1750 low and the speed range exceeded by far a 6:1 speed ratio. 1 was SEND $1 FOR LISTS & totally delighted. Only the initial start was USEFUL DIESEL INFO. made with the Sullivan starter—all others ERIC CLUTTON, were mostly one flip and two flip hot/cold starts with a rubber hose chicken stick. The 913 CEDAR LANE, fuel delivery system’s value is in the com­ TULLAHOMA, TN.37388 pletely smooth acceleration and non-miss running that is so noticeable compared to DAVIES-CHARLTON DIESELS! some other engines in this size. You should NEW PRODUCTION! expect to pay about $75 more for the YS- DART .03 EXCELLENT 120 over other brands—this engine is in a MERLIN .045 QUALITY. class all by itself. The YS-120 is such a fine SPITFIRE .06 ENGLISH performer that the Quarter Scale Pylon SABRE .09 MADE. Racing Association (four-stroke 120 racing centered around Ohio) has banned it since it would obsolete all other current 120s at Imported and serviced in the USA by Bob points out that SAM 46 holds two this time! Futaba Corporation of America and avail­ annuals a year, in April and November, in I feel certain the YS-120’s two one-way able where Futaba products are sold. central west Florida. check valves in the fuel feed system are Manufacturer's suggested list price is We don’t run pictures of Nostalgia era floating open at high speeds and fuel is $529.95. Made by Yamada Manufacturing models very often, but Photo No. 10 show­ being fed to the combustion air with Co. Ltd., in Japan. · ing Dave Platt with a 1955-56 version of straight crankcase pressure—just like on Dave Posner's "Dream Weaver” proves Formula 1 R/C pylon racers. The engine that Platt flies all forms of models, not just Plug Sparks. . Continued from page 37 runs just as great as a properly set Formula R/C Scale for which he is best known. 1 engine on a winning flight. If you want a No awards of any particular value are Of course, it is history now how Platt superb engine for quiet F3A pattern—if planned right now, but you never know came to America to work for Top Flite. you want reliable and scale-like power/ what can happen with a go-getter like Bol­ Some years later, he moved to Florida and sound in your next scale model—if you ton. Call Jack at (703)356-5008 for details. set up his own business under the name of simply want the best running four-stroker SAM 46 Pica. He has remained ever since in Florida. for Sunday flying, try the Futaba YS-120. Bob Nolan, spark plug of SAM 46, writes Some fellows never seem to wear out or Mine is going in an Ugly Stik first—and I to say it has been quite some time since he get old. Case in point: Photo No. 11 show­ expect unflappable performance. submitted any photos of their activities. ing Elmer Wassam cranking on an Ohlsson

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! 81 ford is eagerly looking forward to the SAM peck Silver-Streak Champs at Canowindra in April. SWEDEN Just about the time we had run out of interesting photos, Sven-Olov Linden kindly sent a new batch that we will feature WE SPECIALIZE IN : r each month or as space allows. RUBBER POWER,C02,ELECTRIC What better way to start off than with QUALITY KITS,PLANS, TISSUE.PROPS, Photo No. 13 of Sven-Olov’s six-foot glider BEARINGS, WHEELS AND MUCH MORE 035 ELECTRIC MOTOR known as "Balder.” This 1944 design by C02 ENGINES Rune Anderson is being held by Olov’s SUPER LIGHT WEIGHT ELECTRIC TELCO ■ MODELA ■ BROWN ■ DAVIS WEIGHT ONLY 2.6 0 2 , USES LESS CURRENT wife, Violet. The framework shows the re­ LOWER CURRENT MEANS SMALLER BATTERIES ALSO NEW I THE “1300 R/C BLIMP" semblance to the successful Wakefield TURNS 6-3 PROP 12000 RPM . ONLY 6.6 AMPS CATALOG #30 - $ 2 .0 0 designs of 1937-38, where a long straight IDEAL FOR SMALL R/C Λ FREE FLIGHT wing is employed with small sharply up­ FLY 3 0 TO 4 8 INCH WINGSPAN MODELS turned tips. MOTOR ONLY $19.95 Peck-Potymers As a sidelight, this replica is the second R/C OR F.F. SYSTEM $62.95 ' BOX 249B LA MESA, CA 92044 PHONE (6 19) 44B 1B1B model of the Balder, the first having been built by the original designer, Rune An­ derson, another member of the Vingarna TS THEs. FINEST M.A.C. Bap ASSOCIATES PPS NORTHWEST TRIVIA STARTER BATTERIES. Latest item from Bob Stalick, newsletter 12 Bolts 4.0 Rmp. hour editor of the Willamette MAC is an inter­ BG-P ASSOCIATES with esting and little-known fact from Pete more than 25 years Sotich. Pete works for K&S, which is owned Experience In the Resign, and operated by Wally Simmers, who de­ Manufacturing, and signed the Gollywock and other early Assembling of Nickel Midwest kits. Cadmium cells and When shown (by Pete) the drawings of batteries, now presents the Gollywock, Wally said it was accurate the FINEST STARTER but noted the propeller size should be BATTERV FOR VOUR 13-1/2 inches in diameter. The reason for STARTER, with Charger. the 12-inch kit prop was that their saw used Just Charge It once, and to cut prop blanks could not handle any­ thing larger than a 12-inch length. How it mill last the weekend for Starting your Plane. Also 2.0 and 7.0 Rmp. Hr. For your battery needs, about that? fflSSfflCDSnnES P.®» Cell or uirlte: READERS WRITE 0DD®e®„ ΤΠΒ Old buddy, Mickey (Emilio to you) De- Angelis writes to say he has been having a ball with the new SAM 100 Club. He is WE SET THE PACE! particularly pleased to see quite a few of Michigan’s most complete supplier of ELECTRONIC his old 1934-38 designs being built these model kits & accessories—if it's days. featured in Model Builder Magazine S W IT C H ( 1 0 A ) This columnist has no quarrel with that POSSIBLE USES INCLUDE: we probably carry it in stock. as he used a Cloud Queen at the MAAA We love to help beginners as well ON BOARD GLOW POWER Nationals, Amberly AFB, in the Texaco as the dyed-in-the-wool enthusiasts. (Single or Twin!) Give us a try! ACCESSORY CONTROLS (Video event. Powered by an O.S. .40, the model on/off, smoke pump, Lighting) flew well, and glided exceptionally flat with MEMBER ELECTRIC MOTOR On/Off a Clark Y airfoil. The reason this columnist Radio Control didn’t win or place higher was that, without Hobby Trade CONTROL (020 & 035 or smaller) Features: MIL-SPEC Surface a chair to fly from, he gets vertigo looking Association Mount Technology, Reversing Switch, LED “on" indicator, sermos straight up. After falling on his face and Connectors. Use 2 on 1 channel!! looking for the transmitter, the model had 7845 Wyoming · Dearborn, Ml 48126 · (313) 933-6567 1.5 X .8 X .3 Weight 18 grams S37 lost an excessive amount of altitude. One 17900 E. 10 Mile Rd. · E. Detroit. Ml 48021 · (313) 773-6294 accepted! bummer and you are through! 35203 Grand River · Farmington. Ml 48024 · (313) 477-6266 and —— Mickey sent in Photo No. 14showing his JOMAR, 2028 Knightsbridge Dr. 105 S. Uvemois · Rochester. Ml 48063 · (313) 651-8842 latest scaled-up Miss Fortune X. This 90- Cinti., OH 45244 / 513-474 0985 inch blue and yellow model is powered by an Enya .60 four-stroke. The model has .60 in his Comet Sailplane. A good combi­ been flown steadily for the past three years. nation in 1940 and still a good combo for his new .21 Burford diesel. The second photo (No. 15) is of the SAM O.T. events nowadays. Elmer is a mere 70 Looking over the small magazine draw­ 100 newsletter editor, John Delagrange, years old and still enthusiastic about Old ing, we decided to make a Demon to 1.4x with the framework of an excellently built Timers. Way to go! scale of the original size. In my enthusiasm, 1936 Miss Fortune X. As can be seen, this AUSTRALIA I offered to draw it up before leaving. Talk line of models, the Miss Trenton, Trenton While attending the MAAA Nationals at about shades of the old days! Gordon had Terror, Kloud King and Queen, and Miss Amberly AFB, Brisbane, Queensland, I was nothing but the old brown paper to draw Fortune, have all the same basic outlines taken to the home of Gordon Burford at on, plus one straightedge and a triangle. I and flight characteristics. the close of the meet. had forgotten how we used to “ rough it.” MORE READERS After visiting sundry friends and points After arriving home, I received a letter Charles L. Buchanan, 404 Edgehill Ave., of interest, I found Gordon was interested dated February 19 enclosing Photo No. 12 Kinston, North Carolina 28501, writes to in the Diamond Demon, a Bay Ridge plan showing the completed Diamond Demon. say that he has scaled the T.D. Coupe plans that was put out by Ben Buckle and later Needless to say, Burford was quite enthu­ purchased from Pond Plans to 90-inch published in Aeromodeller magazine. He siastic about the drawing (a two-day spe­ wingspan. The model is now employed to was looking for something to scale to suit cial !) and promptly set to work on it. Bur­ take aerial photographs.

82 MODEL BUILDER We received three photos: one bare- bones structure, one view taken from the model, and one of the finished model. We picked out Photo No. 16 to show what 1 + 1 Charles has done. The model is completely silked and Passe-Temps Cheval de Troie Inc. doped (lightweight Sig orange silk) and trimmed in Miami blue dope with scallops (Trojan Horse Hobbies, Inc.) on all the leading edges. Charles sez he hopes we forgive him as he added ailerons for better control in Announcing the arrival of reasonable prices for shooting pictures. This, and several other Canadian modelers in Canadian dollars small changes, have led him to call the model the C.B. Coupe rather than the T.D., • We carry the most popular planes/cars/boats/HO trains. which derived its name from the initials of • We also carry T.S.R., etc., role-playing games, strategy games, and war Theodore Dykzeul. games in addition to R/C equipment (radios) engines, kits, and accessories. This writer observes that initials have been used for a long time to identify or • We are an authorized “Sig Dealer.” name designs such as K-G, MG, PB, etc. • We will accept mail-orders at 514-934-0324 or 2055 St. Mathieu, #401, 50TH ANNIVERSARY JIMMY ALLEN Montreal, Que. H3H-2J2, if you include your Visa, Mastercard number and “POSTAL AIR RACES.” signature on your/with your order — no extra charge. We use UPS, CANPAR, The latest information received from and Priority Post. We only ship to address of “cardholder” for your protection. Peter Mann, 36 Sydenham St., Guelph, This means we don’t charge you for using a credit card. Of course we will also Ontario N1H 2W4, Canada, consists of the accept bank drafts, certified cheques, postal and bank money orders. Do not announcement of a postal contest for send cash by mail. Jimmy Allen designs. However, in reading • Our pricing policy is simple — U.S. list plus 30%. Add 35% to that for mailing the rules, this turns out to be a single design or shipping by UPS. balance refunded with order. Remember, U.S. list + 30% event for only the Easybuilt Model kit FF- = amount in Canadian dollars. No gimmicks, no giveaways — just 68, which was originally kitted by Ontario straightforward prices and follow-up service. Quebec residents add 9% sales Model Aircraft Co. in Toronto. tax. Models shall be built according to plan • “We” are the people in Quebec for Omega, Cool Power fuels, and Yellow using the materials in the kit. The only Aircraft’s fine line of products including Χ-CeII choppers. structural changes allowed will be provi­ sion for a D-T tail and use of a dowel instead We are here to service you! Come visit. of rear rubber hook. Any color of tissue We have the most reasonable prices in town. can be used. Classes will consist of Junior (up to 16 We will even service what we don’t sell. years of age) and Senior (17 and over). The “We Specialize in Great Things for Nice People. ” original age limit rule of 21 for the original Watch this space next month for fantastic savings. Jimmy Allen Races is waived. Awards will consist of one for the longest single official Our store is located in North Montreal flight regardless of class, an award for the in the Forest Shopping Centre at Amien and Pie-IX Blvd. longest single official flight in each class, (Store 13A: 10561A Pie-IX Blvd., Montreal-Nord, Que. H1H-4A3. and an award for the best total time of Dial information for our new number (no-charge) or call 514-934-0324. three consecutive flights. Flying is to be conducted at any sanc­ If it's available, we can obtain it for you, or custom orders welcomed. tioned model meet between March 1 and WE HAVE THE B EST LINES FROM THE BEST MANUFACTURERS AND SUPPLIERS. September 30. All results should be in the SIG KYOSHO FU TABA ARISTO-CRAFT hands of the Event Director by October 31, ROYAL YELLOW AIRCRAFT AIRTRON1CS GOLDBERG 1989. GREAT PLANES OMEGA/COOL POWER AIR AGE BOOKS T O P F U T E WORLD ENGINES FOX KALMBACH BOOKS ZINGER This is strictly for fun as there are no COX ENYA T.S.R. TESTORS entry fees. A complete entry shall have the BYRON O .S . MAX AVALON HILL P IC G LU ES entrant’s name, address, and class, along ΤΛΜΙΥΑ SUPER TIGRE VICTORY DUBRO MRC SAITO with the times of not more than three offi­ cial flights. Date, place, and name of the AND ALL THE OTHER FAVORITE SUPPUERS OF MODELERS contest shall be indicated by the Contest Director, with a statement verifying the flights. OBIT NOTICE worldwide. The 1939 Jimmy Allen Rules in 1939 were This columnist was caught napping re­ We will miss Shivley, who specialized in (and still are) as follows: garding the demise of Allen Shivley of Las the collection of Elf engines. IHe would put 1. Minimum weight: 42.5 grams. Vegas, Nevada, until Jim Gerrard contacted one complete collection together, then sell 2. Hand launch permissible. the widow to confirm his passing on August it and promptly started on another. I, per­ 3. Flights of less than 20 seconds may be 13,1988. sonally, will miss his table at the Collectos classed as delayed flights. Three of these in Allen will be remembered by most of where he chained all his expensive engines consecutive order will constitute an official the original founders of MECA with Shivley together. Makes it a little difficult to flight. taking No. 1 (this writer is No. 14) when the remove! Other than that, the balance of the rules group of engine collectors gathered rather ANOTHER OBIT are pretty much like standard free flight informally and started signing up members. Just received a newspaper clipping from rules regarding timing, obstructions, dis­ Since then, many people have devoted my good friend John Carlson of Stockton, appearances, etc. much unselfish time to further the cause of California, wherein an obituary on Tom Before we forget it, kits are available the engine collectors. Names that readily Sopwith was included noting his death at from Easybuilt Models, Box 1059, Beams- come to mind are Karl Carlson, Dick the age of 101. Tom Sopwith was one of the ville, Ontario LOR 1B0, Canada. As noted in Dwyer, Bob Cowles, Bob McClelland and early English pioneers in aviation. He won the first paragraph, to get full info on this a host of others without whom the MECA numerous races including several in the fun meet, write to Peter Mann. organization would not have gotten to be United States in 1910.

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! 83 APPLIEO DESIGN CORPORATION would open a trap door and release a DT A 5 f c ) P.O. Box 3384 parachute, which made for a much gentler HAYES WHIP ANTENNA Torrance, CA 90510 (if not quite as positive) descent than the MINI ^ SANDER normal pop-up stab. ADJUSTABLE TENSION The airplane is still active today, being HANO BELT SANDER flown as an R/C model by Ed Houston, FIRMLY HOLDS PAPER FOR EASIER SANOING past president of SAM 49, the Los Angeles • Padded Hats and curves area O.T. R/C club. Ed flies it in Texaco • Handy te HoM o r- with a Saito .30 four-stroke. For R/C, the • Easy to Use 52.65 Vertical whip flat tail surfaces and the fact that the hori­ MINI-STRIPS PRECISION OIE-CUT Medium Garnet zontal stab already has a V cutout for the antenna replaces any SAVES TIME ^ _ _ REPLACEMENT Fine Garnet AND EFFORT S I . 6 5 SANOING BELTS A n t'd Waler Prop! rudder, make installation of control sur­ 18 or 36-inch receiver faces as easy as you could want. Just lay in antenna for R/C cars and TEE BAR an extra V* sq. spar parallel to and aft of the boats. Connec tors, vertical ALUMINUM EXTRUSION existing spar in the horizontal, and forward SAN0IN6 BLOCK of the one in the fin. No balance point is and horizontal mounts and Mr use wit* RUFF-STUFF indicated on either ours or the original "Sefl-edlieslvf sand paper " safety ball all included. Large True Surface τς plans, but a good starting point would be Stainless spring steel W ent Wear Out 11 loch about halfway between the fore and aft Handy te Use 22 Inch $ 4 . 1 5 whip only 1/32 diameter for wing spars. · minimum wind resistance. RUFF -Φ 7 STU FF "SELF ADHESIVE SHEET C / L ...... Continued from page 57 Available at your SANDPAPER < N € 7 local dealer. MAKE YOUR OWN SPECIAL to local competitions. SANDING SHAPES During the years of its existence, the • E tily to Use Flying Lines staff compiled regional stand­ • No messy glue er drying time ^ ______-. -wdlumu. — Floe — Super Floe 1 · 1 D ings and competition records. Since FL has fallen into an uncertain status, the stand­ MINI SAW 58 50 ings have been maintained by their last FL COMPACT 10 inch HACK SAW statistician, Dick McConnell of Seattle, SAWS ANYTHING. ANYWHERE Washington, and published periodically in Saw has rugged dw-cast frame with the Skywriter, the publication of the Seattle comfortable, chip-proof plastic in­ Skyraiders. sert handle Receding nose and ad- The standings cover all events, including jus table B " blade gives good wort access Cuts weed, plastic, metal, AMA events and those with regional rules. HAYES PRODUCTS and HARDENED MUSIC As during the FL days, the standings cover 14325 Commerce Wy. WIRE. extra blades 3/S2.05 contests in all of AMA District XI and British Add 20% for postage. Send 5 0 C for catalog. Columbia. Fliers who place in the top four Garden Grove, CA 92643 of any event are awarded points corre­ chance to fly. Engine and ignition system sponding to the number of entries. If you He founded Sopwith Aviation Co. in were mounted on a common base, the win an event with 20 entries, you get 20 1912 originally to build flying boats, his whole thing being fastened to the nose of points. Second place is worth the number original love. During the war years (1914- each model by a single bolt. After you of entries minus 1, third is minus 2, and 18) the name of Sopwith was emblazoned made a flight, a minute’s work with a fourth is minus 3. Fliers must reside in the on the skies with such names as Camel, screwdriver was all that was needed to get district mentioned above to be counted. Triplane, Snipe, 1-1/2 Strutter, Dolphin, the power unit out of your airplane and Not long after the system was started in and numerous other models. into your buddy’s. Our plans show this 1979, fliers became interested in not only After the war, because of excess profits, same type of engine mount setup. Today’s how they did in an individual contest, but taxes, and the lack of orders for aircraft, the builders will probably want to modify this also in their regional rankings—kind of like Sopwith Co. went into insolvency and was though, either by raising the existing 1/4- the tennis computer rankings. It helped reorganized as the Hawker Aircraft Co., inch plywood plate to just under the upper bolster contest attendance. The standings the Hawker part named after his close longeron, making a cutout for the engine changed somewhat about five years ago friend and test pilot, Harry Hawker. The and mounting it directly to the plate; or by when many racing fliers began working latter company became famous for their doing away with the plate altogether and together under team names, so that their Hawker Fury series of biplanes and then installing hardwood beam mounts. names appear twice as individuals in some the successful Hurricane and Typhoon By the way, both Mickey DeAngelis and events and as a team in others, but the WWII models. After the war a huge amal­ Barney Onofri are still active modelers, general standings interest has continued. gamation was formed, known as the Mickey being involved in the SAM 100 The Northwest records also became a Hawker-Siddley Corp. club—see this month's “ Plug Sparks” col­ matter of quite a bit of interest. FL kept Sopwith was knighted in 1953. · umn for a report on that club’s doings. records for all the events for which there We’d like to thank Carl Hatrak, a longtime were empirical measurements—speed, Old T im e r. . . Continued from page 37 friend of Mickey DeAngelis and another racing, and carrier. Any flier residing in the former member of the Trenton Gas Model district was eligible to be listed for record It’s been called the Trenton Terror ever Airplane Club, for providing us with much performances at any contest. FL also sent since, even though the name “ Miss Tren­ of the preceding information about the out certificates to people who set or broke ton III” appeared on the original magazine original model and its designer. records. After any good flight, it became plan. The Trenton Terror in the photo was common to hear, “ What’s the record?” Barney Onofri, another member of the built as a F/F ship by Marge Bernhardt The standings and records could be a Trenton club, built the prototype Terror, some twenty years ago and featured the model for other areas as a way of increasing which proved to be such a good performer same trim scheme as the original. Power interest in competition. that soon a dozen or more were built by was an Ohlsson .60 sideport converted to a The Skywriter recently published the fellow club members. The only hitch was front rotor, which was really more power 1988 standings. As it happens, Dick Mc­ that there were only a couple of Brown Jr. than the model could handle safely. The Connell was “ Mr. Competition” with 157 engines within the entire club’s ownership, gadget on the side of the fuselage below points scored in a variety of competition so they devised a novel interchangeable the windows is a specially modified clock­ categories. Here are the top competitors in power package that gave everyone a work timer, good for up to an hour, that the individual classes:

84 MODEL BUILDER Junior balloon bust: Wesley Mullens. Balloon bust: Dick McConnell. Profile carrier: John Hall. Class I carrier: David Shrum. Class II carrier: Bob Parker. Overall carrier: John Hall. Speed (all events com­ bined): Marty Higgs (formula 40). Profile scale: Dave Mullens. Overall scale: Dave Mullens. Slow combat: Glenn Salter. 1/2A combat: Chuck Matheny. FoxDoo com­ bat: Mel Lyne. AMA combat: Phil Gran- Alloy Aluminum Drilled & Tapped TWO C Y C LE GIANT SCALE derson. Overall combat: Spencer Shel- Machined Beams 90* Thrust Line drew. Northwest Sport Race: Dave Green. Machined Beams Alloy Aluminum o.s. ENYA Engine Mounting Machined Beams Northwest Super Sport Race: Wayne FS-20 $7 50 35/40-4C $8.95 Bolts Incl. Engine Mounting Drake. Junior Class I Mouse Race: Wesley FS-40/40S 8 9 5 46-4C 8.95 Screws Incl. Mullens. Class I Mouse Race: Nitroholics FS-48 9 9 5 60/80/90/ V»A Sh Bm $3 90 Racing Team. Class II Mouse Race: Jim FS-60/75/90 12.95 120-4C 12 95 VjA Lg Bm 4 10 O S Max 90 $ 19 25 Cameron. Overall Junior Racing: Wesley FS-61 12.95 R120-4C 21.50 09 4.75 O S Max 1.08 19 95 FS-120/120S19.95 .15 Lg Bm 4.95 Super Tigre-2000. Mullens. Overall racing: Wayne Drake. SAITO 19-3.5CC 5 85 2500 4 3 0 0 0 19 95 Precision aerobatics: Jack Pitcher. Old time HP FA 40/45 $ 8 9 5 .29- 40 Lg Bm 6 80 Zenoah G-38 19.95 stunt: Randy Schultz. VT-21 $7 50 FA 65 12 95 .40-61 Sh Bm 6 50 Quadra The Skywriter also lists a partial schedule VT-49 8 9 5 FA 120 19 95 40 RV Pylon 7.75 35/40 21 50 60 Pattern 10.25 of upcoming Northwest contests: WEBRA Undrilled May 27-28: Northwest Regional Control T4-40 $ 8 9 5 6 0 .9 0 $11 25 Line Championships, Eugene, Oregon. T4-60/80 12 95 T a t o n e , INC. June 17-18: Northwest Control Line It not available from your hobby shop. ORDER ______Speed Championships, Richmond, B.C. DIRECT Check. MO. VISA. MC or COD accep ted Add $2 50 lor SAH. 2 00 lor COD Califor­ 21 6 5 8 Cloud Wiy · Hayward. CA S4545 July 15-23: AMA National Model Air­ nia residents add 6%% sales tax In CA 415-783-4868 · Out CA 800-482-8663 plane Championships, Richland, Wash­ ington. Sept. 2-3: Internats, Richmond, B.C. Sept. 16-17: Raider Roundup '89, the c a m Washington State Control Line Cham­ Build a Paper Orbiter pionships, Kent, Washington. Circus Hobbies of­ Build for display or hand launch October: Stuntathon, Portland, Oregon. fers you the con len­ Speaking of schedules, we now have in ience o f catalog RC hand the Nationals schedule, including the unofficial events. shopping with 80 Sunday, July 16:1/2A speed, 1/2A profile plus product lines proto speed. including JR ra­ Monday, July 17: A speed, FAI speed, dios, Kali heli­ junior slow combat, senior slow combat, copters, Webra open slow combat, .21 sport speed (un­ NASA Space Shuttle engines and 11’ long 8 'wingspan Printed on official). high quality gloss paper Tuesday, July 18: B speed. Formula 40 Hirobo cars. So call speed, open slow combat finals. Northwest toll free for a free Circus Hobbies catalog! Send S4.00 check or money order to: SABO Designs in Paper Sport Race (unofficial), Northwest Super P.O. Box 161742 Sport Race (unofficial). Altamonte Springs FL 32716-1742 Wednesday, July 19: D speed, jet speed, 1·800·782·0022 Florida residents add 6% tax FAI combat, open and advanced precision aerobatics. extremely enthused about flying combat active and competent in a short time. And Thursday, July 20: 1/2A combat, open competitively again. they’re likely to run across people they and advanced aerobatics, profile Navy “ I am outdated in terms of personal flew with years ago. One of the joys of carrier, scale racing. knowledge. I have sent for an AMA mem­ competition is the network of friends that Friday, July 21: Junior combat, senior bership and have been reading M odel fliers make with people all across the combat, open combat, open precision Builder, Flying Models, etc., in a quest for nation. aerobatics, advanced aerobatics finals, knowledge. Can you help me get up to Much has changed in combat since Neil junior aerobatics, senior aerobatics. Class I speed in any of the following areas: dropped out, but the important things still and II Navy carrier, Mouse Race (Class I), "1. Info regarding different combat de­ are the same—the object still is to cut the FAI Team Race. signs being flown today. string! Saturday, July 22: Open combat finals, “ 2. Membership info for the Miniature One thing that has happened since Neil’s open precision aerobatics finals, rat race, Aircraft Combat Association. earlier era is that combat has fragmented 15 and sportsman Navy carrier. "3. Today's hot engines and where to into a half-dozen different categories. For Sunday, July 23: Slow rat race. buy same. purposes of answering some of Neil’s OUT OF RETIREMENT "4. The hot setup as far as wing covering questions, we’ll assume that he plans to Neil Simpson of Leicester, Massachu­ material. make his return to the same event that he setts, tells a tale that’s quite common on "5. Pen bladder tanks and other alter­ flew in the ’60s, which we now know as the C/L flying site in recent years: native fuel systems being used and where AMA combat, or "fast combat,” or. in the "lam writing, asking for help. I was once to get same. rule book, just "combat.” All the other an avid control line combat competitor. “ 6. Groups, clubs, individuals, etc., par­ events have their attributes, but for most This was in the mid-60s when we flew ticularly in the Northeast, involved with serious fliers, fast combat is the one true VooDoos with silk covered wings, Johnson control line combat.” calling. motors and Veco four-ounce tanks. Re­ People like Neil are greeted with en­ For general information about combat, cently my son started building control line thusiasm by the current crop of model­ readers may want to refer to the "how to models and he has involved me to the ers—they’re “ newcomers” to the current get started in combat” column in the point where my interest in the sport has scene but they have a good background in March/April 1989 issue of Model Builder. been completely rekindled and I am now the hobby and can jump in and become Some of the following will review that

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 85 tact Fox Manufacturing Co., 5305 Towson INSTRUCTORS!! START YOUR STUDENTS Ave., Fort Smith, Arkansas 72901. WITH A FOX 25 RC ON THEIR FIRST MODEL. Most fliers nowadays cover their planes with FasCal, a product of a company called HERE IS WHY. Fasson, which is available througfi paper supply wholesalers. It comes in 50-yard * NO OTHER NEW 25RC HAND STARTS AS rolls, and they’re cheaper if you buy two rolls (about $90 a roll where I get it). I EASILY AS THE PRE RUN PRE-ADJUSTED usually try to find somebody to buy one FOX. roll and I use the other. It’s a couple of years’ supply. An alternative is to use the ★ NO OTHER 25RC CAN BE REPAIRED colorful plastic coatings such as MonoKote, AS QUICKLY OR AT AS LOW A COST EconoKote, Solar Film, etc., though they AS TH E 25 RC come in smaller quantities and tend to be more expensive. Sure — when he has mastered that FasCal, a mylar, has its own pressure- transmitter and can roll, loop and sensitive adhesive. You peel off the back­ fly inverted without breaking into a ing, position and smooth it on, then iron it cold sweat, one of the new high or use a heat gun to shrink, tighten and compression, schnuerle, ball seal. The other plastics don’t stick until you G lo w P lu g heat them. Plastics take a little practice to bearing, ABC type may be right for In c lu d e d learn, but they’re much quicker once you him. But right now he needs the get used to them than the old silk/dope #22500 Fox 25 RC — 74.95 easy cranking, easy starting, method, though not as strong. You can’t forgiving, low cost Fox. It has Bore .680 Stroke .680 use dope on foam, by the way. FasCal can A Long Stroke Design more than enough power to fly a be used at either high or low heat; if you Wt. with Muffler — 8 V2 oz. 40 size trainer and he won’t need use a hobby shop plastic, use a high-heat a hundred dollars worth of starter type (MonoKote, for example) for balsa planes and a low-heat type (EconoKote, paraphernalia to start it. Quickcote, Solarfilm) for covering foam. The almost universal fuel system in Don't write off the Fox 25 RC modern times is the bladder tank, though because of its low price or old FOX MANUFACTURING CO. what is most commonly used is evolved fashioned looks. For a first RC 5305 TOWSON AVENUE from the “ pen bladder” system. It employs model it is the best available — FORT SMITH. ARKANSAS 72901 heavy surgical tubing, such as the material PHONE (501) 646-1656 that R/C glider high-starts are made of, regardless of price. FAX (501) 646-1757 which is available at hobby shops. About $20 will buy a lifetime supply (keep it in the dark—sunlight destroys the rubber used general combat primer. a very personal matter. to make surgical tubing). To make a blad­ Most of the competitive fast combat To join the Miniature Aircraft Combat der, tie a knot in one end of the tubing and designs today are variations on the tapered Association, send $15 dues to MACA in cut it off about four inches long. Insert a foam wing design. Wingspans typically vary care of Mike Urban, 316 Spring Ave., Glen 1/2-inch length of brass tube into a piece from 45 to 48 inches, with a root of about Ellyn, Illinois 60137. The newsletter is edited of neoprene tubing, and insert that end of 10 or 11 inches and at tip of 7 or 8 inches, by Pete Plunkett. the tubing into the open end of the blad­ with a fairly long single tailboom and a big The most common engine and the best der. Wrap with copper wire, or, better yet, elevator with not much travel. These planes buy is the Fox Combat Special Mk VI, a tiny nylon electrical tie (available in auto are very stable in level flight but very quick available only from the factory, at $80each. parts shops). “ Train” the bladder to blow in the turns, excellent for eyes-off flying. This is an ABC setup (aluminum piston in a up from the front toward the back. Pinch Kits are available from such cottage chromed brass liner). If you can find older the bladder in the middle and use a syringe manufacturers as Bear Model Products, Combat Special Mk III or IV engines, you to inflate it with air several times; after that Dox Generix and The Core House, and can use them competitively as well—they it will automatically blow up starting from others that are listed periodically in the may be available from combat fliers in your that end. The bladder is inserted into a MACA Newsletter. area who have switched to the newer ver­ tube or some other fuel-proof opening in If you want to build from scratch, I sug­ sion. The Mk VI design is still gradually the outboard wing. Some new designs are gest getting plans for the Undertaker from approaching its full potential, and does using an external bladder, but I’m not Model Aviation. It’s a 1984 design by this require some rework for best results. Re­ convinced yet that this is the way to go. writer and an excellent one for somebody timing the crankshaft is one essential for Fill the bladder with fuel using a two- returning to the activity after a layoff. It is fast combat. The Mk VI comes from the ounce plastic syringe, available at some excellent for eyes-off flying, upwind, etc., factory with a timing that’s better for slow drug stores. Use a hemostat or some other and is extremely easy to build (four to five combat. The crankshaft’s opening is rela­ device to pinch the lead tubing off when hours each, for a slow builder like me). My tively unimportant, but it should close the bladder is full. own current plane is the Underdog, a Gene between 58 and 65 degrees after top dead Bladders take some getting used to, but Pape design with basically the Undertaker center. they’re the only way to fly. The procedure construction but a faster airfoil. For the Other engine choices include the Ci- is to use a syringe to put fuel in the bladder, Undertaker, ask the AMA for plan No. 489, polla .36 (very light but of questionable then pinch off. Attach the fuel line to the published in October, 1985. There are availability), the K&B 5.8 (too heavy, but engine (I use a filter as a connection point). many other good designs, only a few of powerful, again of questionable avail­ Set the needle so that fuel drips out of the which have been published; a visit to a ability), the TWA .36 (a homebuilt that’s venturi at a steady but not too fast pace combat contest will give you a tremendous expensive and difficult to get) and the when the plane’s tipped on its nose. Give field to choose from. Most of the top fliers Hoffelt .36 (a destroked K&B 40 that’s real the engine a small exhaust prime. Release insist on flying their own designs because, fast but—gulp—$250 each. This informa­ your hemostat and hold the pinch with considering that the combat flier must fly a tion tends to make the Fox the choice of your fingers. Apply the battery and flip the plane at 120 mph in wild maneuvers, chas­ most fliers. The Combat Special is a labor prop. When the engine starts, release the ing a moving target, without looking at his of love made by Duke Fox especially for pinch and fuel will come through. If you own plane, choosing just the right design is combat fliers; it is not sold in stores. Con­ don’t have access to a pressure regulator

86 MODELBUILDER (rare but nice to have), make sure to set your engine rich before takeoff—it will lean out as it unloads in the air. Anyone looking for combat contest in­ . How Do You Get Longer Run Times formation in their area, whether it is the Northeast or elsewhere, can find out about & Higher RPM's with Less Weight? much of it by reading the MACA newslet­ ter and the contest calendar in Model A . Aviation magazine. Anyone who would NOVAK Speed Controls. like to get in touch with Neil Simpson for Novak Electronics wants to introduce to the some flying in the Massachusetts area can ELECTRIC AIRPLANE MODELER a device which contact him at 87 Lake View Drive, Box 22, every serious car racer in the world knows Leicester, Massachusetts 01524. about... Bonus: You didn’t ask, but remember MOSFET Speed Controls. that modern Schnuerle engines like to turn Why use the traditional high power loss me­ high rpm’s. As a starting point for propping, chanical switch when you can use a fully pro­ get some 8-1/2x6-1/2 Top Flite pylon racing portional speed control which is better than props (you’ll probably have to special order 99% current efficient? You get higher RPM's, them) and cut them to 8 inches. They’ll let fully proportional throttle and lower weight (re­ your motor wind but still have power places servo, switch, & messy wiring). through the turns. A final mailbag item: Two of the photos Interested? Send for more information. this month come to us via Stuart Rich­ mond, of Apopka, Florida, who is in touch with many C/L fliers around the world. OVER 10 YEARS DEDICATION The group shot of adult fliers is from a TO THE RC INDUSTRY contest in East Berlin on Oct. 24,1988. Second from right in the back row is Piotr 128-C E. Dyer Road, Santa Ana, CA 92707 E L E C T R O N I C S , I N C . Zawada of Poland, Stuart’s correspondent and the contest winner. The group shot of the young fliers and their airplanes is a group Piotr teaches, seen at a contest in TH E B E S T IN SC A L E Warsaw on Oct. 9,1988. These C/L air­ Price $210.00 + $20.00 shipping via UPS only planes of ours sure do get around! Formerly Aero Cratt Questions, comments, and photos al­ ways are welcomed. Send to John Thomp­ son, 1520 Anthony Ave., Cottage Grove, Oregon 97424. ·

Choppers...... Continued from page 21 $400 heli radio will also do the job. Engine and muffler will run you another $200. With any R/C helicopter, I suggest you always buy an electronic yaw rate gyro. It costs FOCKE WULF FW 190A-5 OR A-8 80" SPAN between $70 and $150 but really makes a SMI KIT INCLUDES EPOXY GLASS FUSELAGE. COWL, BELLY PAN & GUN COVER helicopter easy to fly. CANOPY, FOAM CORES FOR WING. STAB & FIN Whichever helicopter you buy, make BOB ΙΙΟΙΜΛΝ - P.O. BOX 741-M B SAN BERNARDINO, CA. 9 2 4 0 2 , 7 1 4 -8 8 5 -3 9 5 9 EVENINGS sure you also build a training skid to pre­ vent the helicopter from tipping over and breaking the rotor blades. Expect to make homework. While building my GMP settings of your engine. at least 20 to 30 flights before you can Legend in January, I came across the “ Learn Use a fuel with about 12% nitro in it and, hover your helicopter fairly well. Add an­ To Fly” pamphlet enclosed in the Legend’s if you wish to ensure a slow “ break in,” use other 30 to 40 flights before you start flying instruction manual. I don’t think I could some castor oil in your fuel. Start the en­ around in the sky. It takes work but it is have done better in explaining how to gine with the main throttle lever at its low­ well worth it. Soon you will be able to go to begin flying, therefore, with the manufac­ est setting and with the transmitter idle any empty lot, pop out your favorite heli­ turer’s permission, I have enclosed a por­ trim at full. The engine should run at a “ fast copter, put it in a hover and fly circles tion of what GMP has to say about starting idle.” The clutch will engage at around around lamp posts. For more information, flying. This applies to any brand of heli­ 1,500 rpm. It cannot be stressed too highly call the R/C helicopter manufacturers copter you learn on, it does not have to be that when starting the engine, and until listed in Table 1, they have technical people a Legend. you are actually ready to hover the heli­ on hand to answer your questions. * * * copter, the rotor head should be held Once you finish building your heli­ TRIMMING AND FLYING firmly in one hand. If you watch any expert copter, you will want to get started on the Try and find a quiet spot, certainly away flying his machine, you’ll see that he does flight training. All beginners should seek from pets and children, and a smooth sur­ this and it is simply to cover the possible the help of someone who already knows face such as concrete or asphalt. Have cases of the engine being started at full how to fly. Ask your local hobby shop for somebody with you when you are testing a throttle by accident, or your radio not be­ the names of local fliers or clubs. Why helicopter in case there is an accident and ing switched on, or somebody else's radio monkey around and risk hurting yourself! you need immediate assistance. interfering with yours, or a link is missing R/C helicopters can be dangerous if not Now, follow the engine manufacturer's from your helicopter, etc. Any one of a treated properly. A 1/4-pound main rotor instructions to set the idle and the top end number of things could cause the engine blade, spinning at 1500 rpm, has a blade tip carburetor adjustments of your engine. to start at high speed and, if you are not speed of 200 mph and can easily chop you With a new, non-ringed engine, it is ad­ holding the rotor head firmly, then the up. Learn the fundamental ideas first. visable to have at least half an hour of helicopter, at best, could start off violently Nothing makes a teacher happier than bench running. This will also help you to and hurt you or anybody near. At the worst, discovering his student has done his familiarize yourself with the carburetor it could take off, out of control, and unless

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 87 no damage to the helicopter) in this way. (714) 642-3799 So why not try the one hand (two func­ tion) at a time method? One prerequisite to learning, in any event, is to have a well trimmed helicopter. Even an experienced flier, if the helicopter is not trimmed, can find it difficult to main­ The ‘super’ systems tain a stable hover, and you will normally Maneuver, mix, adjust, find that the experienced flier will land the reverse and monitor. machine again, several times, after very We introduced expo rates! short experimental liftoffs, if necessary, to get the trim right. So, before you learn to Three, six and eight channels hover, it is extremely important to seek the “S T I L L T H E B E S T ! " help of an expert or a reasonably accom­ plished flier, if one is available in your c M IL L C O T T vicinity, to hover your helicopter for you Millcott Corporation and to make sure that it is properly and 177-F Riverside Ave. Newport Beach CA 92663 accurately trimmed. The helicopter blade angle setting in pitch (main and tail) must be correct. The “ tracking” of the blades must be right, the helicopter drive ele­ ments and engine must be running smoothly and well, and the helicopter should have very little "shake” on the tail boom or the landing gear. If all of these things are not correct, then don’t continue. Once the helicopter is in trim and running smoothly then, and only then, should you commence your learning to hover. If the drive elements are not operating properly, recheck all the clearances and settings. If CATALOG: $7.50 Contains 1000's of paper airplanes. From postage the blades are “ out of track” and you do stamp size to 6 foot wing span! Gliders or rubber powered. Die-cut not have any expert help available, then or you-cut. Largest known source of paper airplanes in the world! you should proceed as follows: Cost of catalog deducted from 1st order over $25.00. ASTOUNDING! First we must stress that you should not, Catalog and CORSAIR papen airplane. above.: $ 10.50 plu.6 $ 2. SO pottage. repeat not, track your main blades by holding your helicopter by the tail boom while lifting it into the air. This is an ex­ A T L A S T . . . tremely dangerous practice and is strongly CBO ILLY^PRO PSJ discouraged by CMP. A Free Flight Model Retrieval System that However, tracking the blades is certainly works . . . EVERY TIME. a difficult procedure for the beginner since Merco Engines it requires the actual hovering of the heli­ An ultra light weight, long range copter for a short period in order to be Classic CL & RC Plans miniature transmitter combined with a able to observe which blade is higher than Merco Parts & Service highly sensitive receiver and directional antenna will quickly help you track and the other. We will, however, describe this CL Stunt Engine Rework locate your plane. procedure for you and, even if you cannot observe the blades yourself, you should try Catalog $2.00 NEVER LOSE ANOTHER MODEL! to lift the helicopter to a hover just for a Send SASE For Brochure second or two while a friend or somebody else kneels down, at a safe distance of Jim Walston course, and observes the "tracking.” If your TOM DIXON Retrieval Systems 725 Cooper Lake Rd. S.E. Legend spins sharply in one direction or 1938 Peachtree Road, Suite 401 Smyrna, GA 30080 the other, please check that your gyro Atlanta, GA 30309 404/434-4905 sense is correct. A reverse sense gyro can cause serious problems to the machine and those around you. So, if there is any you were able to regain control quickly, category, we believe, as those fixed wing doubt about this, stop your engine and you would lose your helicopter and possi­ fliers who can take off, fly around and land check that the gyro causes the tail blades to bly hazard other people’s property or even fixed-wing planes with little or no effort move in a direction to oppose the "yaw­ life. So please observe the “ Golden Rule” and in a very short time. This section of the ing” of your helicopter. for all good helicopter fliers: Hold the rotor Legend manual, however, is intended for "Tracking” is a measure of the lift of head firmly with your hand all the while the “average modeler” who eventually has each of the blades, which should be equal. the helicopter is not actually in position for a heck of a lot of fun flying model aircraft, If the lift of one blade is greater than the flying! And, as soon as the helicopter has but takes a little time (and effort) to achieve other, then the tracking is wrong and there landed and the blades have come to rest, this result. So, unless you possess more will be vibration and loss of control. The tip hold the head again firmly before you do than average coordination, or you have a of one blade must be marked with a piece your shutting-down of the engine! And lot of money and time, we offer the fol­ of colored vinyl or MonoKote during the never air-taxi out from the pits or near lowing method of simplifying the process building phase and the idea behind this people or property! and learning to fly with little or no damage will become apparent now. If you look at So now on to the first phase of learning to your machine and your ego. the edge of the blades while they are run­ to fly. Now, learning just one function at a time ning and the helicopter is just lifting off the There certainly are some fliers who are is really impractical unless a training rig to ground, you will notice that if the blades so well coordinated that they can hover a tether the helicopter is used. Learning the are tracking you will see only one blade at helicopter successfully after a very few at­ functions two at a time, however, is quite the tip, but if they are not tracking you will tempts. These people fall in the same easy and many people have learned (with be able to clearly see one blade higher

88 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! MODEL BUILDER C1988 Futaba Corp. fessor ideal for novice flyers. flyers. novice for ideal fessor h etrs htmk te Pro­ the make that features the A R F assem bly are ju st a few of of few a st ju are bly assem F R A electric flying easier than ever. ever. than easier makes flying that electric trainer control radio the the box ready to assemble. ready box the The complete Professor kit comes out of out comes kit Professor complete The la, ue ligectment excitem flying quiet Clean, Go to school with the Professor, Professor, the with school to Go Extrem ely stable design and design stable ely Extrem It’s elementary with the Professor.

ready for takeoff. for you’re and ready install batteries and motor, radio S540SH R Mabuchi propeller the Mount ages. wing, pre-covered built-up, And fessor show you how how you show fessor Pro­ the to the gearbox o f the powerful powerful the f o gearbox the to link­ pre-installed and tail stabilizer, attach halves, assembly special for the need eliminate stabilizer and tail rigidity. and for strength fuselage the exceptional for used are rials ipei a be. can it simple and Futaba the as close as is skills. Simply join the wing wing the join Simply skills. schoolyard. dacd lgtegtmate­ m lightweight Advanced, lt AeobatcHiooFtb hp unk Chipm irobo/Futaba H tic a b ero A ilot. p E le c trify in g fun fo r th e m ore advanced soonk ore ble m e vaila th r (A fo fun g in trify c le E wich n onncos: 24'x 92'x 63'BEC E B ' 3 .6 0 g x ' in d 2 .9 2 texclu x ' r­ 4 ox. rfo .2 1.5 e 1 p el: n um n a h optim C r nectors»: 4 n fo d s: co n and ire tio u h q itc re ) cifica sw ed e d p S clu in ance. tNot m r e iv e c re uaaMCR- I e at MOSFET pee c r l tro n co ed e sp T E F S O M d te ra teg In A -4 R C M Futaba 4 Studebaker/lrvine, CA 92718 CA Studebaker/lrvine, 4 714-455-9888 regulator. Voltage Futaba Corporation of America of Corporation Futaba andChannel charger.2-4 radio control system Motor Wingspan (electronicspeedcontrol optional). 7.2v/1200mAH REQUIRES: NiCd batterypack Recommendedsystem Weight tw/rec ly-Ucm) Area Length RFSO SPECIFICATIONS PROFESSOR 39 or. 39 (890mm) 35.04' reductiongearbox m sq. 446.5 (1240mm) 48.82' Futaba 4NBL/MCR KS540SHw/3:l

INDOOR MODEL SUPPLY tim your printer Into an airfoil plotter with.... pound or less instead of its normal weight. Under these conditions it is then quite easy, ENDURANCE RUBBER MODELS FOILED AGAIN!! by using the transmitter tail control lever, COPTORS THE· ΕΑ5Υ B - L u r to move the nose of the helicopter to the I ? > *— \ 18" Span right and to the left, back to the center 12* Span I $5.95 again, to the left, to the right, back to the • PLOT AIRFOILS IN ANY CHORO TO 24 INCHES center again. Ail the while you are doing THE SLOWPOKE 16 Span • MODIFY THICKNESS, CAMBER, TRAILING EDGE • PLOT SKIN THICKNESS FOR SHEETED WINGS this you will make small adjustments in • ENTER DATA EASILY WITH BUILT-IN EDITOR throttle in order to keep that one pound of • EASY TO USE, MENU-DRIVEN OPERATION weight constant. • INCLUDES AN 18-PAGE ILLUSTRATED MANUAL I Weigh! 2 Pennys S5.95 Soon your reflexes will learn how to co­ Plastic Prop 3 Parlor Planes The Novice Penny Plane ordinate the sideways movements of your CA riildinti v D J . J J add «X ta> left hand with the movements of the heli­ Ovaraaaa ordara: bank draft for UStSO copter rotating to the left and to the right Require* IBM compatible computer and dot-mairix printer with the up and down movement of the Plaaaa epeeffy computer and left hand to vary the "lift” of the helicopter. $8.50 10" Span printer type whan erdarlng. Do not make any right hand or cyclic NEW TOP FLYING MODELS Sand cfieck or money order to: FOR CONTEST & SPORT IN AND OUTDOORS CYGNET Software movements when practicing this exercise. 24843 Del Prado #141 Dana Point CA 92629 20" DAPHNE EA. $8.50 It’s hard to say how long you should FLAPPING FLYER keep up this practice, but certainly you «ox- should continue until you can do it without 2 CHANNEL PISTOL GRIP feeling strained during and after each ses­ WHEEL R/C ΟΠ 75 MHZ sion. When your left hand has been trained to keep the tail straight and the altitude Easy handling for high constant, you can now commence to learn speed racers ..with 2 high coordination of the helicopter's lateral torque servos Battery movements with your movement of the box receiver and switch right hand stick. So now the next step is to harness open the throttle so that the helicopter 13" SCALE AIRCRAFT KITS rises in a positive manner to a position OUTSTANDING DETAILS. 3-VIEWS & HISTORY $7795 between three and five feet off the ground. AERONCA K 1937 ALCO SPORT 1929 WATERMAN RACER 1921 It’s hard to believe this when you first begin IN .is*· .«let V. 00 VMCpmx) .VKJ runotinq ZIPPY SPORT A.R.V. HEATH PARASOL 1928 fit.trrye to iwyment ot yout (XOer an to learn, but if a hovering helicopter is well ca. $8.50 mwenerk money o»'lei trotHO cn«k INDOOR MODEL AIRPLANES by Lew Gitlow rreot card'tnriude trimmed and adjusted, there really is plenty 48 pgs. 100 lllust. (reprint) + FREE PLAN.. $5.95 ,«ro*mt numixi .win eicw.iton cure· of time to maintain, or to correct, the INDOOR BALSA PACK $8.25 P-NUT PACK $8.25 JAPANESE TISSUE 18" x 22" 7 color roll $6.95 546 Bergen Ave. Jersey City. N j 07504 helicopter’s movements sideways, back­ CONDENSER PAPER 2/S3.25 MICROLITE $3.25 RUBBER LUBE $1.95 BALSA CEMENT $1.95 Telephone <20i) 552 8100 Dept 27 wards and forwards. THRUST BEARINGS Mini Dual or Dual $1.00 ■ S S m S 1 800 225 POU 910 5 SO ESI An analogy which reflects this argument RUBBER 025 to .090. 005 inc ea $2.65 6:1 WINDER $5.95 16:1 MARK 1 $13.95 and one that beginners seem to under­ WE STOCK PECK. FUN. & BROWN A 23 CO* stand is that you can regard the helicopter ADD 10% POSTAGE-MINIMUM POSTAGE $2.00 off. Even in the hover your engine should as a large balloon floating a few feet off the NEW 18-PAGE ILLUST CATALOG $2.00 still "burble” occasionally. ground. The balloon can wander around BOX 5311, SALEM, OR 97304 If you find that you need much more tail as a result of small gusts of wind from dif­ blade pitch angle than has been suggested ferent directions. We can keep the balloon in the instructions and the helicopter’s stationary in front of us by “ patting” it at than the other. Because the blades are nose is always trying to turn to the left, the right place and at the right time. If it marked individually you should then be then you are probably running with too moves away from us and we pat it towards able to judge which of the blades is the much pitch on the main blades. If, how­ us it may need another pat to stop it coming higher. Now, to correct the tracking, you ever, you find the helicopter blades are and position it where we want it. Except, of must change the pitch of one of the blades. running very fast and the nose always ap­ course, it will drift off again after a short Before we do, however, we should also pears to be wanting to go to the right, then while and we will have a continuous task of note one other factor and that is that the you are probably running with too little providing the right control inputs to keep main blade speed of Legend should be pitch on the main blades at liftoff. You will the balloon stationary in front of us. around 1,700 rpm at liftoff with a throttle soon become accustomed to being able to Once you have learned to fly the heli­ setting of around half. If the speed is higher adjust both the speed of the main rotor copter, then the "pulsing” will blend into than this, then in order to adjust the track­ blades and the tracking of the blades by smooth, but still very small control com­ ing, we should increase the blade pitch adjusting one of them. mands. Flowever, at the early stages, re­ angle that is the lower of the two. If the Place the helicopter on a smooth and member to think of the helicopter as a Legend's blade speed is lower than 1,700 level surface and start the engine. Stand balloon which, let’s say, is drifting towards rpm, then we should lower the pitch of the back and to one side, about six to ten feet you. You "pulse” the stick towards it, you blade which was higher. This means that away from the machine. The reason for pat it back. As it starts to drift back, you’ll by adjusting the pitch of one of the main this is that you will now have the best view need a small input in the opposite direction blades we can make one blade run higher of the fore-and-aft and side-to-side move­ to pat it and stop its motion so that it settles than the other, or by adjusting both to­ ments of the helicopter if you are looking in the spot that you want it. Don’t forget gether we can lower the rotor speed of the at it from 45 degrees. For instance, if you that you can start a helicopter moving in helicopter. stand directly behind the helicopter, then one direction with the force produced by Because the Legend has collective pitch the fore-and-aft movements are harder to the right hand stick but you will probably, you may also change the rotor speed by detect. The secret of accurate hovering is unless you have given exactly the right increasing or decreasing the collective to make control inputs at the instant that force at the right time, have to give an pitch setting after tracking the blades as the helicopter starts to move, and maxi­ opposite force in order to slow it down described above. mum anticipation is helped by the best and to settle it in the position required. Finally, please note that your high end and earliest visual information. Please remember that the foregoing ap­ throttle adjustment (needle valve) should Now, take a deep breath and try to relax. plies only when the helicopter is well be set so that the engine is on the verge of Run up the engine with the throttle lever designed and, most importantly, well running rich (occasional four-cycling or until the helicopter is light on its skids, so trimmed. "burbling” ) until the helicopter has lifted that it apparently weighs perhaps only a So, try these hovering techniques and

90 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! MODELBUILDER

continue to control it as if nothing had CHEETAH MODELS 14725 Bessemer St. "B" happened. Which brings us to: Van Nuys, Ca, 91411 SLOPE ACROBATIC. COMBAT GLIDERS FAILSAFE What is it, and what can it do for you? SUPER CHEETAH CHEETAH Well, first off, failsafe of any kind is available Span: 64 in. Span: 48 in. only on PCM systems. Not in an effort to Area: 496 sq. in. Area: 432 sq. in. make you spend more money for a more Weight: 34 oz. Weight: 32 oz. expensive system, but simply because PCM Loading 1045 οζ/sq. in, Loading: 11 oz./sq. ft. systems are the only ones in which a $49.95 $42.95 microprocessor is used. The microproces­ sor, an electronic brain of the type which make computers possible, can be pro­ grammed to sample, to remember, and to react, none of which can be done without it. In the case of the R/C receiver, the UNBREAKABLE microprocessor is adjusted to react to the FUSELAGE loss of a clean signal and to react in various ways. DEALER INQUIRY INVITED (818) 781-4544 Failsafe comes in a variety of modes, depending (like a lot of other system fea­ tures) on the complexity of the system. The simplest failsafe though, the one I consider the most valuable, is battery failsafe. This all takes place in the receiver, which is able to determine when the airborne battery has ' « reached a critical low. At such time, the Old Timers & Antiques For your Reed Valve Engine failsafe pulls the throttle back to idle, the • Diamond Zipper exact point being full low on some systems • Flying Quak CHAMPION FF KITS: • Red Zephyr and adjustable on others. In any event, you "Wake-Up" Wakefield $48.00 • Miss Philly get a warning, and in most systems, you "Champion Coupe"...... $2800 » Eaglet • Commadore can override it by cycling the throttle stick, "Upshot" Mulvihill...... $26.50 ViA$422 ‘/aA $522 which will give you a set amount of time of CHAMPION RUBBER throttle control again, long enough to al­ 1/8, 3/16, & 1/4 widths .040 thick. STAZLIT FUSE 10’-$322 15’-$4°2 25'- 522 low you to set up for a landing. In the $12.50/lb. Box* Illustrated Plans Book $2.50 battery failsafe mode, all other controls are CATALOG $1.50 B&D MODELS fully operational. CHAMPION MODEL PRODUCTS P.0. Box 12518 Next we encounter failsafe as triggered Reno, Nevada 89510 880 Carmen Ct., La Verne. CA 91750 by interference, or by the loss or drastic (714) 599-3348 reduction of the transmitted signal. The * Includes US

92 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! MODEL BUILDER blockage by long servo leads or metal con­ trol cables—all of the above, and more. The failsafe cannot do this on its own, only when the conditions as sensed by the re­ ceiver warrant it. Turning off the failsafe is not a cure, as the next time the airplane experiences the cause of the problem it will be out of control—this time with all servos at extreme positions or moving wildly back and forth.

Failsafe systems vary somewhat from sys­ S P O R T B 1 P E s tem to system and from manufacturer to S □ OUARTER SCALE PLANS- ·/ manufacturer. I recommend that you study Quarter Master Sport Blpe* D 3 Ouadra 35.. 73'Spon..E-Z build.. s21· CA the instructions for yours until you under­ £ Great Flyer..*Semt-K»t Available PPO BUILD YOUR stand it thoroughly—it might save your DAV I S D-1K 90.5 Span.. airplane sometime. I will admit that I had (A Ouadra 35 power or similar.. p p o s2 5 · OWN ROCKET C some reservations on the value of any of 1933 KI N N E R SP O R T S T E R the available failsafe systems, until one of Model K.. 117"Span .035 power. p p u S 2 5 · MOTORS! my friends saved a helicopter, which is WE CAN SHOW YOU HOW! 4-CYCLE PROJECTS IQ easily the most unstable and unforgiving MgVY AKRON FUNK 3 flying machine of all, with the failsafe in a 1 5 Scale 64' ap.in 60 ·«· (A 4 cycle Fantastic Flyer 1 PPD S2 1 * • Futaba 8-channel PCM. •40 POUNDS DAVIS D-1K·· 60.3" Span * * * 4 5 4 cycle or similar. PPD 5 * THRUST! Two mcb ecale or One Si*tn scale I An out-of control airplane is not an un­ * 50Φ EACH! heard-of thing, and nobody, but nobody, 1933 KINNER SPORTSTER*· -| Model K..78“ Span. .61-.75.4cy. PPO s I O no matter how great a flier, how experi­ • With a rock tumbler and some simple hand tcols enced, or what his position might be in the we II show you how to build YOUR OWN rocket engines in youi own garage or workshop tor 1/5 to More 0^*A Plat R/C world, is able to diagnose what hap­ cooling 1/10 the cost of the commercially marketed motors pened or at what point. Yes, radios do fail, • INTERESTED? Just send us $2 00 and we ll mail you P H O T O DO C U M E N T A T I O N PACKS available- on our Scale Plans... our brochure along with a WORKING SAMPLE ot an but so do pilots, airframes, and then there electric igniter that YOU CAN MAKE YOURSELF Irom ALL PLANS ROLLED SHIPPED UPS is also that old devil interference, a situation Complete w Instruction Booklet materials you II find around the house which seems to get worse with time. On S e n d *1.00 for Catalog TELL YOUR FRIENOS ABOUT US! We re the 00 IT New York State Resident» add 7% sales tan Send check YOURSELF ROCKET people that subject, not everyone will accept that or Μ O . COCX's Allow 3 week· tor check to clear interference comes not only from other Write to: Department MB7, The Telefllte Corporation R/Cers at the same field but can come d GA d e s ig n s 11620 Kitching St.. Moreno Valley. CA 92387-9978 from anywhere on the globe. And outer 135 East Main St., Phalps, NY 14532 space now! Nor can one definitely place Phone 1-315-548-3778 STWPftD GLOW PLUG THREA0S? the blame on the radio just because it isn’t 4-stroke heads are expensive and difficult to replace. We working after the crash, as the shock of replace your damaged threads with a stainless steel device. We see entirely too many success­ hitting the ground has got to have a detri­ 1/4-32 insert, long or short Much stronger than original ful R/C flights to brand R/C systems in aluminum or brass threads Engine disassembly NOT mental affect on it. general as totally unreliable. Look closely necessary. 2-strokes repaired also. Cashiers check or Conversely, if the radio is working after money order only (no cash) S13.95 per ineert plus $2.00 at some of the system installations and the the crash, we can't positively say it quit in return freight (within continental U S.) general condition of a lot of airplanes at Send to: W.P.S., 15208 Raymer St. the air. I will never accept that a piece of any field, and being completely honest, Van Nuys. CA 91405 · (213) 873-4696 electronic equipment will die completely evaluate the chances of many of them sur­ and be revived by hitting the ground at the viving to be senior citizens, and not to be speeds at which most R/C models fly. The TxCheck is priced at $59.95, and is done in by other than the R/C system. Anyway, we all feel better if we know available only from Kraft Midwest, 117 E. why something happened, at least with a * * * Main St. - Upper Level, Northville, Michi­ view towards preventing the same thing The Kraft Midwest TxCheck has recently gan 48167. Incidentally, Kraft Midwest is in from happening again. Though still not come my way and I’d like to share it with a completely different part of the country pinpointing the cause of an in-flight you. The TxCheck is a small hand-held RF from the center previously mentioned, and out-of-control situation, there might be a monitor that generates an audible noise might be more convenient to some of you. clue, a short-lived one but nonetheless anytime it is in the presence of a strong It is a total service center, in spite of the valid, that will sometimes tell us the dif­ radio signal. It can be an easy way to locate Kraft name, which is held over from the ference between a radio failure and inter­ a transmitter that has been inadvertently days of Mr. Phil and his gold boxes. Try ference or some of the other failure modes. left on in a service shop or in a transmitter 'em, you’ll like ’em! The behavior of the model prior to its impound. Eloy Marez, 311 Mesa Dr #10, Costa demise can be that clue; sometimes there The TxCheck covers 27 to 75 MFHz; AM, Mesa, California 92627. · will be definite difference. For example, an FM or PCM, which includes all of the airplane that all of a sudden maintains the modeling bands and transmission modes. S o a rin g ...... Continued from page 30 original flight path without any deviation It is small and light and operates from a until it hits the ground does indicate a single 9-volt alkaline battery. Its sensitivity One of the best rules I ever heard was: if dead radio. Not necessarily a radio failure and volume can be varied by adjusting the the model rises in lift, find out how big the now, as an improperly secured battery that length of the collapsible whip antenna. thermal is. This helps one determine where pulls its connectors apart can cause a radio Note that this is not a highly sensitive band the core should be, i.e. halfway through to go dead. But for whatever reason, such or channel monitor that can be used to test the lift. Figure 5 shows how this idea works. airplane reaction generally indicates a life­ for incoming interference, but a limited Continue flying straight when lift is en­ less control system. range device intended to locate an oper­ countered. When the lift turns to sink, note Now on the other hand, an out-of­ ating transmitter in close proximity. It will how far you've come and turn around 180 control airplane that constantly changes help to locate a transmitter when one is degrees. Begin circling at the center. direction can and often is being influenced known to be "on” in the area, and a single Figure 6 shows how this is done if the by outside interference. An uncontrollable sweep with it over the impound area will thermal is entered off center. Again, see roll or down elevator can be a servo failure. certainly save someone's airplane from a how wide the lift is. Toward the end of the It can also be a loose hinge or control forgetful or careless fellow flier. area of lift you may notice the model has

JULY 1989 93 to come down. What's next? Landing. Terra firma. The moment of truth! Will the glider Invisible Svitch™ re-kit itself? Will the landing be sloppy and (direct replacement for your radio on/off switch) embarrassing? Like thermaling, there is a preferred method of approaching the landing target area. Most pilots feel comfortable with the classic rectangular pattern shown in Figure Und Ve Call It “ Der Svitch"“ 11. This can be adjusted to suit the field “ Der Svitch” ” is an on-board magnetic on/off switch for your radio equipment that conditions easily. If it’s windy, the down­ hides inside your fuselage. It is activated from outside with the included small bar wind leg is kept short. If the field is small, magnet (shown above). Why cut those awful holes in your fuselage... Isn’t it time you the pattern is reduced in size to suit. made “ Der Svitch”? If the breeze is gentle, start the pattern Ideal for: with about 30 seconds worth of sink time • Any R/C Plane, Boat or Car · Scale Projects · Water Flyers left in your glide. Judge this by present Safe to use: altitude and current sink rate. Fly down • Consumes no power · Vibration free · Crash resistant · Compatible with your radio wind from yourself for ten seconds and • Optional red LED lamp installs on your plane, dash or wing to indicate "radio on” state turn to your base leg. If the wind is blowing Simple to Install: hard you can cut this time down drama­ For Futaba and Airtronics radios, order Model 1402 and simply unplug your on/oft switch and plug in tically. Fly down the base leg for five to “Der Svitch” or order Model 1401 and use the connectors from your old on/oft switch (instructions eight seconds, depending on the wind you supplied). Each “Der Svitch" includes a bar magnet aclivator as shown above. encountered on your downwind leg, until Model Description Price, ea you are almost directly down wind from 1401 “ Der Svitch”, with activator, no connectors, twisted leads $19.95 ea the spot. The base leg can be adjusted for 1401 LED “Der Svitch”, with activator, no connectors, twisted leads. altitude and speed using spoilers or flaps to with option leads tor external LED # 1405 $24.95 ea 1402* “Der Svitch”, with activator, with connectors lor Futaba or assure a precise final approach. Turn up Airtronics $24.95 ea. wind, allowing enough time to get back to 1402LED* “Der Svitch”, with activator, with connectors lor Futaba or the spot. It will take longer to come up Airtronics and option leads k>r external LED # 1405* $29.95 ea 1405 LED red lamp w/24" twisted leads lor Models wind than it did to go down wind. 1401 LED and 1402LED $8.95 ea. Shooting landings over and over is the * If ordering Model f 402 or 1402LED, please specify your radio and connector types. Connectors are only way to get good at judging the three only available for Futaba "J", Futaba "G" and Airtronics radios. legs of the landing pattern. To order, include your name and address, specify modeHs) needed, include check or money order and This completes today’s armchair flying send to Ragan/Barker Group, 5050 Quorum Dnve, Suite 741, Dallas, Texas 75240. Please add $2.50 per talk. I hope that you found something order to cover U P S. charges Texas residents add sales tax Credit Card orders call between 9:00 and profitable in it. Sorry I bored you if you 5:00 Central Time. M-F. Please allow 2-4 weeks for delivery. didn't. If you have any thoughts, tips, or Patent Pending, Dealer Inquiries Invited observations in this area, please send them Order “Der Svitch” toll free 1 -800-336-0602. In Texas dial 214-991-1876. in! I’ll be glad to air them so that we can all benefit! veered slightly to the right. This is your ways to go about this. First, I look at the sky ♦ * * tip-off that the main core is to the left. for thermaling aircraft or birds. They’ve RIP-STOP PARACHUTES Make a 180-degree turn back to the left already found the lift for you. Time to replace that old rag that used to and start circling halfway across the area of Second, I’ll look for signs at ground level look like a parachute? Michael L. Schultz lift. for nearby thermals. Shifts of wind direc­ of Airmen’s Supply Co., P.O. Box 1593, In Figure 6 the dashed lineshowsa right tion or speed can sometimes be indicators Norfolk, Nebraska 68701 has a nice one for turn mostly in sink. Turn more than 180 of lift nearby. These are detected by feel­ you! degrees to get back to the center. ing, or are visible as unusual wind in nearby Airmen’s Supply Co. is offering two sizes Figure 7 shows the model just grazing trees and grass. Thermal columns are like suitable for winch or hi-start. The large one the outer edge of the thermal. In this case big invisible vacuum cleaner hoses. They is 15 inches across in the shape of a first-aid the left wingtip would rise faster than the suck in air from all sides and take it up. cross or Red Cross logo. Each arm of the right, pushing the model into sink im­ Here's what to look for. There is a brief cross is 5 inches wide for a total of 125 mediately. Make a quick turn to the left lull in the wind just before a thermal passes square inches of surface. toward the tip that came up. See how wide directly over a spot, then there is a big The color is a dark red. According to the core is and center it. increase in wind just as it passes. A thermal Schultz, these parachutes have proven Figure 8 shows how to recenter if part of passing by will feel like a 90-degree shift of themselves to be quite durable over the your circle is in sink. Note the midpoint of wind, as shown in Figure 9. Please note that past seven flying seasons. The rip-stop the circle’s arc which in sink. Ninety these are observations made from a sta­ nylon chute has eight lines of 50 pound degrees later straighten out the model and tionary viewpoint as the lift drifts by, not test twisted nylon sewn onto the surface in reenter the core. Wait a few seconds and from the moving wind. zigzag stitch fashion. A one-inch chrome start circling the same direction as before. Third, if there are no indicators, I go plated steel key ring slides over the glider’s Where To Find Thermals where I think the likelihood of lift is high. I towhook, and a similar 1.25-inch ring at­ From our earlier discussion, we know look for thermal generators, then send the taches to the winch line. what kinds of things generate thermal lift. sailplane over to check them out. Pricing of these chutes is quite reason­ It follows that if you go where they hang Fourth, if I haven’t a clue. I’ll fly a large, able. It is hardly worth the effort to make out, you’ll see them, right? Very true. cross-field zigzag pattern upwind (see one yourself when you consider the price. Flowever, thermals don't always cooperate Figure 10), like a sailboat tacking upwind. I The small chute is $7.50 plus $1.00shipping when you want them to, so it’s best to have find that I see the plane rise in lift much and handling, the large one is $8.50 plus a a backup plan. better from the side. Also, in the zigzag buck. When I fly at a new field, or a field that I pattern, I never cross the same dead air Send for your parachute and when you have very little stick time over, I someti mes twice (a big no-no!). do, ask for their catalog. Tell Michael that ask the regulars where the most likely hot Finding thermals takes practice. There is Model Builder sent you! spots are. They know, and they are gener- no substitute for a trained eye and an ex­ SAILPLANES INTERNATIONAL ally more than happy to share their perienced thumb. Give yourself time to From time to time new gliders come knowledge with you. learn! along, make headlines, gain acceptance, If I want a challenge, I go out and look Landing The Model and even popularity. But it isn’t very often for thermals. I find there are a couple of Okay, so your neck is tired and you want that an entire line of sailplanes comes along

94 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! MODELBUILDER SHELDON S HOBBIES POSI-CURE ™ CYANOACRYLATE SALE W E’VE GOT THE CURE We’ve got the cure whether you’re torn, ripped, shredded, frazzled, smashed, crushed, cracked, chipped, fractured, split, snapped and shattered or just a little bit stressed. 1 oz. Fast Cure 3-5 Sec...... $ 2 .4 9 2 oz. Fast Cure 3-5 Sec...... $ 3 .9 6 1 oz. Gap-Filling 10-25 Sec...... $ 2 .4 9 2 oz. Gap-Filling 10-25 Sec...... $ 3 .9 6 If you are not satisfied with POSI-CURE please return the unused portion within 30 days for a full refund - No questions asked! SHELDON S HOBBIES L 38 2 135 Old Oakland Rd. · San lose. California 95131 ORDERS (800)228-3237 ONLY (800) 822-1688 “ For Information Call: (408) 9 4 3 -0 8 7 2 SHIPPING - U P S. Surface Add $3 95, U P S. Air Add 10% Parcel Post Add 10%. Parcel Post Air Add 15%. C.O.D. Add S2.50 [ master charge HOURS Mon & Fri: 9:30-7:30. Tue. Wed & Sat 9:30-5:30. Thurs: 9:30-9:00. Sun 12:00-5:00 as is the case with Sailplanes International. gelcoated fiberglass fuselage, and factory forced, then obechi sheeted. The airfoil For the first time, a major U.S. importer presheeted obechi veneer foam core used is the Quabeck HQ 1.5/12 modified. is bringing into the states most of the sail­ wings. The fuselage has plenty of room for This airfoil section lends itself very well to planes from this internationally known any radio system you may own. It requires flaperons, and the Racer CS can be set up British company. That importer is Global two or three functions: ailerons, elevator, this way. Hobby Distributors and its mail order af­ and optional rudder. The Racer CS can be flown in a wide filiate, Hobby Shack. The models range The Mini-Racer is a small, low-drag de­ range of wind strengths. It is aerobatic and from small slope ships to competition sign which produces sparkling perform­ fast. Specifications are: 78.7-in. span, 670 models, scale models, and thermal ships. ance on the slope. It can even be put away sq. in. area, 49.5-in. length, flying weight of They may be purchased through your local in your car without disassembly. Specifi­ 58 oz., 12.5 oz./sq. ft. wing loading, and hobby dealer. cations for the Mini-Racer are: 60-in. span, functions consisting of ailerons/flaperons, Very quickly, I will give a brief descrip­ 40-in. length, 424 sq. in. area, 10 oz./sq. ft. rudder, and elevator. It sells for about tion of each model. wing loading, and the all-up weight is 3 $169.99. The Secret Weapon is a state-of-the-art, pounds. It sells for about $139.99. The Axle is a pivot wing slope racer or sport aerobatic slope soarer. Its slim fuse­ The Ridge-Racer is, as the name implies, aerobatic sport plane. Its wing actually lage is of wooden construction. Its foam a slope racer. It’s six-foot span makes it rotates to achieve roll control. There are core wings are presheeted at the factory suitable for short to medium courses. It is a no ailerons. The Axle is very efficient and with obechi wood. The Secret Weapon is fast, low-drag design. “clean” as it cuts through the wind. Drag capable of flying in a wide range of wind The Ridge-Racer is also very good at savings in the wing, fuselage and T-tail pay strengths with or without ballast. aerobatics. It has inversely tapered ailerons off with high speed. This same low drag The design features a slim fuselage with for crisp, instant roll response. This makes property gives the Axle the ability to stay large side area to aid in knife-edge per­ it an ideal multipurpose slope ship. Over up even when the wind is only a slight formance. The Secret Weapon's wing tran­ six years of development and refinement breeze. sitions from a semi-symmetrical airfoil at have made this model near optimum for The Axle features a molded white fiber­ the root to a fully symmetrical airfoil at the its type. glass fuselage, presheeted obechi veneer tip. This provides good soaring ability and The Ridge-Racer comes with a white foam core wings, precision cut balsa parts, excellent axial rolls. molded fiberglass fuselage, blue tinted and complete control linkages. Specs are: The Secret Weapon’s specifications are: canopy, foam wings presheeted with 76-in. span, 374 sq. in. area, 28-32 oz. flying 61-inch span, 44.5-inch length, 490 sq. in. obechi veneer, and full hardware. Speci­ weight, aspect ratio of 14.5 to 1, 10.8-12 area, all-up weight of 2 lb. 12oz.,and wing fications are: 72-in. span, 650 sq. in. area, oz./sq. ft. wing loading, and functions loading of 13 oz./sq. ft. Controls are aile­ 42-in. length, 2 lb. 14 oz. average flying consisting of rudder, elevator, and rons, optional rudder, and elevator. It sells weight, and 10-12 oz./sq. ft. wing loading. wingerons. It sells for about $139.99. for about $79.99 at most outlets. The model can be ballasted for racing up The Osprey 100 is the model which will The Mini-Racer makes a great transi­ to 7-11 lbs. It sells for about $169.99. have the broadest appeal because it is very tional model from basic trainers to the The Racer CS is a 2-meter slope ship that well suited for thermal flying as well as more aerobatic and responsive aileron is unique among ARF gliders. It features slope flying. It is also one of the most af­ models. The kit comes with a molded white foam core wings which are fiberglass rein­ fordable in the line. In England, the Osprey

JULY 1989 95

the board, add the hard balsa filler at the trailing edge where the wing bolts will go through, build up and install the aileron 0^ JOHN POND ^ horn assemblies from music wire and brass tube, add the wing attach dowels at the leading edge, then go ahead and close up Old Time Plan Service the center section by adding the top 3/32 The largest selection of plans in the world at the most sheet. Don’t forget the little 1/4-circle gussets at the outside corners; these will reasonable prices. Each list $1.50 make your wing look much more finished after the covering is on. No. 19 O LD TIM ER F/F GAS Get out the sanding block and cut No. 19 O LD TIM ER RU B BER /TO W LIN E everything down to final shape. The lead­ ing edge will have to be brought down to No. 19 O LD TIM ER F L Y IN G S C A LE A through K the correct airfoil contour and blended No. 19 O LD TIM ER F L Y IN G S C A LE L through Z into the tip bows, which in turn need to be New plans prices effective Jan. 1989 to Dec. 1989 sanded to a radius and faired into the W-4s. Make sure that the rear edges of the nose P.O.Box 90310 ribs are rounded off to prevent unneces­ San Jose, Calif. 95109-3310 sary bumps in the covering, and be com­ Phone (408) 292-3382 (Tues. or Fri.) pulsive about block sanding the entire outer wing surface to insure that all the outer edges of the various structural components are in line. A single rib pro­ HAVE YOU TRIED FULL-SCALE7 truding above its fellows will ruin the ap­ A FTER YOU DID A LL TH E W ORK, WHY LET pearance of the entire wing. Make the cutout in the center section YOUR AIRPLANE DO ALL THE FLYING? for the aileron servo and install hardwood INFO $3.00 BUILD & FLY TH E miniMAX YOURSELF! servo mounting blocks. Sand the ailerons to a final fit, test fit the aileron hinges, and check the entire aileron assembly for free­ dom of movement. FUSELAGE The fuselage construction is easily what we might call traditional. The two side frames, which include FD-1 and WS, are built up of hard balsa or spruce. Block sand the side frames true after assembly, then add the 1/16 ply doublers ahead of F-2, * Computer Designed * 3 Axis Control being certain to make both a left and a AWARDED SUN-N-FUN 86 right side. The sides can now be joined ■ Part 103 Ultralight " Easy Construction Most Innovative New Design" * Wood Construction over the top plan view, placing them on the plan upside down to allow them to rest TEAM INC .. BOX 338M, BRADYVILLE. TN 37026 (615) 765-5397 securely on the board, join first at F-2 and F-3, then draw the sides together at the tail, joining at the tail post and at the F-4 The Only Way to Fly USTOM CUSTOM through F-7 locations with 1/4-inch sq. Fabtronics M ark 3 C.D.I pointless system MODEL crossmembers only on the bottom. Now RAFTORS BUILDERS remove the assembly from the board and join the sides at F-1. Add formers F-2A through F-7, followed by the 1/4-inch sq. top stringers at both the nose and tail. Make and install the 1/8 ply tailwheel mounting plate, then LG-M and WM. PLANES CARS / / KITS Don't forget the triangular gusset blocks BOATS TRAINS / ~ from / PLANS above WM. Works Great for Most 40+ years’ experience ■ Special machined pans available. Now comes the fun part. Cut the wing 2 and 4 Cycle engines root fillet bases from 1/32 ply, taking care Automatic Spark Control now available INTRODUCTORY SPECIAL: for moat 4 cycle anginas. that the primary grain on these runs span- SIGKADETII Complete Ijess cnginc/radio $247.50 wise to allow easy bending around the Complete System (Lass Batteries) ...... $69.95 (add $3 post, & Hand.) Send SASE for particulars to: wing saddle. Note that these bases extend FABTRONICS to the inside edge of the WS pieces. Lightly Tp/· USTOM Suite 200 2069 Zumbehl Rd. 3 7 5 Is/· Royale Rd., Galeaburg, IL 61401 Si. Charles, MO 63303 glue the bases in place only at the very RAFTORS (314)946-7154 front end of the wing saddle, so that you will be free to make incidence adjustments alignment and mark the wing accordingly. at the trailing edge if necessary. Line up the Now block the fuselage on the bench with saddle assembly in position. Recheck in­ wing as accurately as possible, measuring the top longerons at 0 degrees incidence cidence and alignment, then drill through in from the tips to establish an accurate and use an incidence meter to establish the trailing edge into WM for the wing centerline, and make guide lines to align the wing incidence at 2-1/2 degrees posi­ mounting bolts. I opened up the holes in the wing with the inside edges of the WS tive, measured using the chord line shown WM to accept DuBro 10-32 threaded in­ pieces. Mark and drill the 1/4-inch holes in on the plan; this is where the “ V” guides of serts and used 10-32 nylon bolts through F-2 to accept the mounting dowels, then a Robart or similar incidence meter will the wing. install the wing in the fuselage, pinning it center themselves on the airfoil. Cut away When you are satisfied with the wing in place temporarily. Trammel from the or build up the WS saddles at the trailing installation, fix the airplane back in place top center of F-7 to an appropriate point at edge as necessary, then align the plywood over the top plan view and use a line drawn each tip; insure that you have proper fillet bases and Hot Stuff the entire wing at right angles to the fuselage centerline to

JULY 1989 97 the covering job. Add the side stringers, noting that these are relieved where the 3/32 nose sheet covering lies over them. SPORTSMAN/ Follow these with the 1/8 sheet balsa fillers under the horizontal tail. Add the belly stringer and fair it into the bottom of F-3 NOVICE with scrap balsa. Sheet the top of the nose with 3/32 balsa. The top sheets extend to the lower edge of the upper longeron, and F3E CONTEST will have to be cut at the low point of the cockpit opening to allow you to align the $2000.00 CASH PURSE ON PRIZES rear edge flush with F-3A and wrap the forward portion around F-2B. Light wetting on the outside and a little patience should get these in place for you. Edge-join narrow sheets if necessary to get wide enough pieces of 3/32 sheet to cover the entire forward fuselage sides from the top lon­ geron to the bottom of LC-M. Mark and cut the outlines of the wing saddle and the rounded cutout at F-2B, noting that you will have to add filler blocks of 1/4x1/8 balsa on the outside edges of F-2 and taper them into the upper and lower longerons to give the side sheet a secure base for CASH PRIZES: $1,000.00 1st place attachment. The side sheets are installed flush with the top cowl sheet and with the 600.00 2nd place bottom edge of the lower longeron and 250.00 3rd place LG-M. Don’t forget the tapered extension of the side sheet behind F-3 which allows 150.00 4th place you to blend the sheet area smoothly into Contest held in Costa Mesa, California the lower longeron. Finish closing the nose by adding the 3/32 sheet under the nose; Aug. 19, 20, 1989 install this cross-grain and terminate it where the front edge of the landing gear Hosted by Harbor Soaring Society will rest on LG-M. Now trim the cockpit Co-sponsored by Airtronics & Model Builder opening to final shape and go over the entire fuselage with your sanding block OPEN TO U.S. RESIDENT AMA MEMBERS ONLY and blend all the edges, keeping in mind the lines the covering will follow. On my Any U.S. F3E FAI team member or anyone who qualified airplane the wing root fillets were added after the nose was fiberglassed, a detail I’ll for the team selection m ay n o t enter or compete. explain shortly. Since those of you building this airplane ENTRY FEE: $25.00 are not beginners, I’m not going to hold your hands on the cowl and wheel pants. Seven 1.2 M.A.H. or smaller batteries, any size electric motor, There are no plastic or fiberglass units any size glider. Winning planes will be weighed and measured available for this design, although if some­ one out there likes it well enough to want to assure they’re within FAI (AMA) F3E rules. to make them available, I’d like to hear from you. The pants are built up of several Send for entry or inquiries to: 7 Cell F3E Contest laminations of light 3/8 balsa sheet with Felix Vivas 1/4-inch sheet outer faces. Add copious amounts of carving, sanding and fiber- 1800 16th St., H-310 glassing and the results will be beautiful Newport Beach, CA 92663 wheel pants. I inset 4-40 fiberlock nuts in the inner edge of each pant, liberally re­ inforcing the entire area with Hot Stuff. The nuts are matched to a 1/16-inch establish a square mounting for the hori­ should make provision for one degree of aluminum plate slipped over the axle and zontal stabilizer. Measure the tip distance right thrust. Mount the landing gear, set­ held in place on the gear by the same nut off the plan to insure lateral alignment and ting blind nuts into WM for the mains and that locks the axle in place. Check the satisfy yourself that the stab rests securely into the tailwheel mounting plate for the photos for a good look at this. on the top longeron; horizontal tail in­ tailwheel assembly. The cowl is carved and hollowed. If you cidence relative to the longeron should be Remove the wing and set it out of the want to make a mold and do it in fiberglass, 0 degrees. When the stab is securely in way while you finish closing up the fuse­ have at it! I mounted my engine, removed place, follow it with the vertical tail, aligned lage. Install the 1/8 ply battery compart­ the exhaust and needle valve, wrapped the square with no offsets. Trim the vertical tail ment floor. Add the turtledeck stringers, engine securely in masking tape and with leading edge laminate as necessary to allow followed by the 1/4-inch sheet filler blocks the spinner mounted, built up the cowl it to fair smoothly into the top stringer. At at F-3A. Rough cut these on your jigsaw around it. Starting with a block about one this point it starts to look kind of exciting, and make a couple of round sanding inch thick and opened up to fit over the doesn’t it? blocks from various size dowels to finish front of the engine, I roughly built up Line up your engine mount on F-1 and sand the inside curves. Add the 1/4x1/8 enough wood around the engine and drill the necessary mounting holes. Install fabric attach strip along the top surface of spinner to give me material to carve and blind nuts on the back of F-1. No down- the horizontal tail on each side of the ver­ sand. When everything was smoothly thrust is used on this airplane, but you tical fin; these will be essential to complete shaped and blended I removed the cowl

98 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! MODELBUILDER and cut the air intake, exhaust, and other S c h l u e t e r F r e e F l i g h t M o d e l s openings and gave the outside surface a coat of 2-ounce fiberglass cloth attached with resin. When this had cured I opened Hobby Lobby’s up the inside of the cowl with a rotary file, several sanding blocks and a lot of MEW! patience, then added another coat of resin inside and out, followed as you might guess by a lot of sanding. The wheel pants got the PACIFIC ACE(PA) BLACK BULLET (BB) CA TALOG 14 same treatment, using 3/4-ounce cloth. K IT NO. PRICE EACH POWER While working with the resin, I covered PA OB BB—20" 57.95 RUBBER is ready PA OR BB—30" $14.95 RUBBER the entire fuselage back to the stringer PA OR BB—40" 521.95 RUB/GAS NOW! fillets behind F-3A, as well as the entire KITS CONTAIN ROLLED PLANS. SELECT PRINT wing center section, with 3/4-ounce cloth. 4 STRIP BALSA, WIRE, WHEELS, PLASTIC PROP OR BALSA PROP BLANK, NYLON THRUST The trick to doing good, light fiberglass BEARING, BALL BEARING WASHER (30" 4 40”), Catalog 14 is BIGGER than ever work is to control the amount of resin that JA P A N ES E T IS S U E , PLYWOOD, AND ALUM. with over 200 things MOTOR PEG. a d o s 1 .0 0 p a h f o r e a c h k i t o r d e r , c a . r e s . stays on the airplane by using an appro­ AOO β*» TAX. you have never seen before: priately light grade of cloth, and by re­ 3508 POINSETTIA AVE. MANHATTAN BEACH, CA. 90266 NEW Giant Telemaster. moving any resin that lies above the cloth weave. A good alternative is the attach­ NEW High-performance Electric Motors ment of the fiberglass using Hot Stuff; this with NEW Props and accessories, is quicker, lighter and just as strong. I used Electric Flight NEW Electric Airplanes and the resin on this job to get a little more material On off Controller world's FASTEST electric plane, buildup on which to sand out a really slick Perfect for 05 Motors 5-10 cells NEW FAST boats. base finish. NEW Steam boat, If you want to try a different system on NEW 0RAC0VER covering material, the cowl and pants, have at it! What I have NEW Helicopter, described has worked well for me on a NEW sailplanes, NEW accessories... whole succession of airplanes, and at the Has Brake 2 month expense of being a bit labor-intensive, Lightweight 1.2 oz. money back Adjustable switching point guarantee produces beautiful, durable accessories Soldcrlr&s terminal for easy hookup that fit perfectly. Controller $24.95 More Power, sa*e weight As I mentioned earlier, the wing root Very high efficiency only 0.06V loss fairings were added after the entire nose at 20 A. Size 2.2x1 J «.63 Add SI.00 for shipping was fiberglassed. In the case of my airplane California residents add 6.5% $ 1.63 Ta* this was done because I used Sig's Epoxolite Send Check or money order to High Sky to form the fillets, and the polyester resin 3929 Kansas St. #9 used with the glass cloth won't cure in the San Diego,CA 92104 presence of most epoxies. Different mate­ rials may allow you to avoid this problem, but the sequence didn’t cause me any trouble. Having the area around the fillets glassed allowed me to work the Epoxolite into a nearly finished shape with copious amounts of water and the end of my finger. The cured material could subsequently be ‘Matched Performance System” wet sanded to a final finish without having for TOP PERFORMANCE K4B ENGINES to worry about unprotected balsa getting Airplane Marine wet. K&B FU ELS K&B GLOW PLUGS Callus at (615) 373-1444 Now is the time to do a temporary in­ 9 Blends 4 Choices or send the order form. stallation of your tank and route all fuel “Matched Finish System” FREE IN THE USA system plumbing. Do a preliminary instal­ for B EST APPEARANCE Outside USA send $2.00 lation of your radio system and make sure K48 FIBERG LASS CLOTH K4B Micro-Balloons FILLER K4B SUPER POXY RESIN K4B SUPER POXY THINNER everything fits now, so you won’t have to K4B SUPER POXY PRIMER K4B SUPER POXY PAINT cut up a finished covering later to get it to K4B MIXING CUPS Call for FIRST CLASS mail work. I permanently installed two plywood $2.00 — bill to your credit card. K&B MANUFACTURING rails at appropriate locations on the inside * 5 ϋ > 12152 Woodruff Avenue MB of the radio compartment, then screwed a Downey. California 9024 1 plywood servo tray to them. My switch and charging plug are mounted on a may be familiar with. As there is no leading Name bracket in the cockpit. Put the entire air­ edge "D ” tube to absorb vertical flexing plane together to insure that the spinner loads, the wing becomes dependent on Street Address doesn't bind on the cowl, that the landing the covering for some of its strength. My gear tracks properly, and to eliminate any prototype has been well tested with a other nasty little gremlins that will be covering of dacron polyester (Sig Koverall) City tougher to fix later. When you have applied with a heat-activated adhesive and tightened with two coats of nitrate clear everything the way you want it, it’s time to Slate Zip cover and finish. dope before being primed and color fin­ There are so many methods available to ished. Any of the synthetic fabric coverings model builders these days for covering and (Coverite, Worldtex, etc.) will work as well HOBBY IPBEY finishing airplanes, many of which work if given a coat or two of nitrate clear dope INTERNATIONAL. INC very well, that I won’t attempt to specify a before final finishing; this will prevent the “ best” method for this airplane. I will sagging long after application that some­ 5614 Franklin Pike Circle mention one important reservation: this times affects these coverings. I specify Brentwood, TN 37027 wing structure was designed to be a little nitrate dope because it bonds far better to (615) 373-1444 more flexible than some of the wings you dacron than does butyrate dope, and also

JULY 1989 99 allow for some adjustments. The pieces N E W fro m you will work with will be attached along Modeling Accessories the upper longeron and to the fabric attach (jtlOIV ' ' m strip that runs along the top of the hori­ Spinner tri-pfrop sets for zontal stab center section (now you know why I put those there!), to the edge of F-3A MASTER AIRSCREW* Rubber Powerea Models and to the dorsal stringer, and to the lead­ Package contadnijoj/sets to ing and trailing edges of the vertical tail. Start by attaching the fabric to the upper make four, threrw a£ props. longeron and the fabric attach strip, then C ompleteinsM|icfi onsj^aU ems, to the trailing edge of the fin. Keep it tbrtiai bearina^aiUlTrioiYveishera stretched out pretty tight. Now start work­ ing around the fin leading edge and into Precision slripwood is easy with the Balsa Strip­ (prlhe per. Strips up to 1/2" wide and 1/4” thick can be the curve between the fin and the dorsal cut quickly and accurately from sheet stock. A MftUic Flight tri stringer. Take your time, think about what vernier wheel advances 1/32” for precise adjust­ 8033 Sunset Blvd Suite is going on, and be ready to pull and stretch ment. The stripper uses a std. type 11 hobby the fabric. The heat-activated fabric ad­ blade. S4.95 suggested retail. Los Angeles CA 90046 hesives work well here, as you don’t have *4 .0 0 to wait for anything to dry. You may have Razor to heat your fabric "in the air” as you pull it Plane to get a smooth job over the center of the fin-dorsal junction. Finish up by complet­ The Master J W K f B H * Airscrew Razor ing attachment along the dorsal stringer and F-3A. Wrap a little extra covering Plane u ses a 1/4-SCALE PLANS FROM heavy-duty around and over the edge of the leading FACTORY BLUEPRINTS industrial blade held edge and dorsal stringer to get a good in place by two locating bond. Don’t shrink the covering until you screws allowing cutting depth to be set very i rigidly and accurately. Use it tor rounding and have both sides covered! Small wrinkles smoothing contours of fuselages and cowlings, Λ. will pull out, but you can’t tolerate any shaping edges, thinning strips, etc S4.95 sug­ deep puckers or creases along the edges. gested retail. Replacement blades are available, When you do the second side, you will stock no MA2101, $1.49 for a pack of 3 See Scale R/C Modeler October 88 Wing Loading 18 ozs!!! have to pre-trim the overlapping edge to Span 78 inches, Weight 8.25 lbs. prevent your trim job from cutting through In-Line Area 1053 inches, .46-61 2/Cycle the lower layer of fabric and allowing dr') Fuel Filter Plans, rolled, manual. Spaceman everything to slip loose. When it’s all in decals; $30.00 PPD. place, go at it with the heat and shrink it up T h is fuel filter is an outstanding value. Cowls, pants, Fiberglass Master tight. Beautiful, isn’t it? The trick to this It has a threaded two-part Dry Ridge Models thing is to take your time. It really does aluminum body and a 1 0 0 -mesh 59 McCurry Road (704) 658-2663 work; look at the photos of my airplane for stainless screen which is removeable for easy Weaverville, NC 28787 ______proof. The system works just fine with cleaning. S1.19 suggested retail. plastic, too. If you are using silk and dope, TIRED FORMING PROPS ON BOTTLES be aware that the first coat of dope used to Direct Drive 05 Prop Adaptor AND CANS, WITH UNCERTAIN RESU LTS? seal the silk will probably loosen the dor- sal-leading edge seam badly and spoil the The all-aluminum prop adaptor is designed for 05 electric motors and recommended for use with job. The fix is to make a series of closely Master Airscrew 7x4. 7x6, 8x4, and 8x6 spaced pinholes along the seam and lock it propellers. S3.95 suggested retail. down with a shot of Hot Stuff before that first coat of dope goes on. Heat-activated See your Hobby Dealer adhesives won’t give you this problem. : HARDWOOD PROP FORMS : ANY PITCH : For final setup and preflight of the air­ Computer-Designed; Now you can mold props, plane you might want to use my specifi­ drill to fit any Z bar and know the pitch from hub cations as a guide. The balance location WINDSOR PROPELLER CO. to tip. 10" Form, (up to 20" prop) $15. 5" Form, shown on the plan gives me sharp maneu­ 384 Tesconi Ct. $12,3" Form, $8. $2, S&H. 3-way adjustable Drill vers and a clean spin entry, yet allows some Santa Rosa, CA 95401 Jig (mounts on prop form) and hinge inserting tool. $10.50. Free Z bar with order. For more info, “ drawing” of the airplane for a slow final send S.A.S.E. approach. The control throws shown are sufficient for very fast angular accelera­ SUPERIOR PROPS (904) 944-1972 tions. If you have a dual-rate equipped 2412 Tucson Ave. FI. Res. because all the enamel or epoxy type fin­ Pensacola, FL 32526 6% tax radio you might want to make the first ishes I’m aware of bond better to it than to flights on low rate; otherwise it might be a butyrate. I cannot guarantee that the air­ good idea to make the first few flights with plane will have sufficient structural strength that I must explain in detail. This airplane the throws set at about half of what is if you insist on using an iron-on plastic film demands that you make what is referred to shown. covering. In spite of various manufacturer’s as a faired fabric fillet between the top rear My engine, as I have mentioned, is one claims, many years of experience have left of the fuselage (the turtledeck) and the of my well-loved Saito .65s. I run it, as I do me convinced that these materials add little vertical fin. This is nearly universal practice all my four-strokes, on 10% nitro Red Max or no structural strength to an airplane. on fabric covered full-scale airplanes and four-stroke fuel which I order mixed on a A final note to you real “ old time” adds tremendously to the appearance of castor oil base. This engine flies the airplane builders out there; clear doped, dyed silk models where it is used. Regardless of the with vast power to spare on a Rev-Up 13x6 would work very well on this airplane; in covering you choose, the method of doing wood prop. The airplane will doubtless go fact, I nearly went that route myself instead a faired fabric fillet is the same. Cover the faster than the way I have it set up; if you of doing the multicolored paint job you fuselage bottom and sides separately. Cut want to experiment, you might start with a see in the photos. I’d like to see photos of a two pieces of covering material large 12x8. The one degree right thrust I have clear doped, silked Tigercat if you build enough to cover each side of the top rear specified appears quite sufficient to handle one. fuselage and vertical fin, with enough extra any tendency to yaw in flight when power There is one aspect of the covering job to give you something to hang on to and to is added, but as with any high-powered

100 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER taildragger, you’d better be ready to add lots of right rudder on takeoff. “1991” DESIGNS BY DICK HANSON MODELS The radio is one of my Airtronics Cham­ pionship 7 FM systems, with which I have had nothing but good experiences. You ☆ TIPO + 750” don’t need big servos in this airplane, but I would caution against using "minis” to save a few ounces unless they are designed to ☆ SLIM ZLIN 800” stand a workout; although this isn’t a heavy airplane, it is going to move along pretty ☆ RUNAROUND 800” fast and will impose considerable control "«ssS loads. ☆ DALOTEL 935” A thought on engines; my airplane has a three-color-plus "show finish” and weighs ☆ ULTIMATE 1000” in at well over six pounds. A serious attempt Custom made airframes of proven at building a light Tigercat should yield a competition quality. For over 10 five-pound machine, perhaps lighter. The years we have furnised winning new Saito .5 0 , which I have flown, would be more than enough power if your air­ models in AMA, FAI, & T.O.C. com­ plane comes in at the lower end of the petition. This same quality is weight range. There are several other four- available to all customers. strokes in the same size range that should, Write or call for further of course, work well. information Take your time setting this airplane up, don’t turn her loose until you are sure DICK HANSON MODELS everything is ready to go, stay sharp while 5269 Lucky Clover Lane you have her in the air, and you will be ***** Murray, Utah 84123 rewarded with a satisfying, esthetically different airplane that will attract attention (801) 261-1402 wherever you fly. ·

winter. While I am working, the helicopter Legend...... Continued from page 23 is usually left in the car trunk. When I take OK, now let’s check out the awesome the helicopter out in the afternoon for a Legend and the Quantum radio. First flight the machine feels ice cold, but those things first; how much do they cost? The five little servos come to life as soon as I prices for the helicopter and radio vary at turn on the switch. No sluggishness what­ different shops. If you put down five one soever. hundred dollar bills, you should be able to Now throw in an extra bill, and you will get the new Legend helicopter kit. Add have the brand new Airtronics SC-1 gyro, another six one hundred dollar bills and too. I hope you have an unused .60 engine you will be taking the Airtronics radio sitting at home; otherwise, chip in another home. Are they worth it? Yes! Your wife two bills for a Schnuerle .60 with pipe or will see you beaming from ear to ear. Also, muffler. One of the best .60 heli eYigine all Airtronics helicopter radios come with buys on the market is the Super Tigre .60H five servos. Five 94735 servos at $69.95 each helicopter engine. It is the most inexpen­ are worth $350. So, paying five or six hun­ sive Schnuerle .60 helicopter engine on dred for a top-of-the-line Airtronics system the market. The beauty is that it comes is not bad. (I remember back in 1974, when with a muffler! I am presently flying my my first Kraft five-channel radio with only GMP Stork with a Super Tigre .60H. The four servos cost $300. It had no bells and Super Tigre .60H does not pull my Stork as action. I don’t think there is any other whistles at all. The sticks were nowhere fast as the O.S. .61 RF ABC with pump, but helicopter kit under $1000 having this near the smoothness of today's open gim- for the big difference in price, the S.T. .60H feature. bal sticks. The servos had less torque. And puts out more horsepower per dollar. The 3. The Delta-3 flybarless main rotor head that was 1974 dollars, when gasoline cost a S.T. .60H also has a growling high-pitched also has triple ball bearings: two radial third as much as today. Back in 1974 you sound as you come up to full throttle. A bearing and one thrust bearing. The main could buy a new car for under $2000.) friend described the sound as powerful rotor yoke is machined from a solid piece The 94735 is Airtronics ultimate heli and intimidating. The drawback of install­ of aluminum. GMP says the two surfaces servo. Not only is it powerful, it is very ing the S.T. .60H on the Legend is that you where the thrust bearings are attached dependable. I have used the Airtronics 735 will have to spend 20 extra minutes grind­ have been carefully checked to ensure that with my older Module 7H radio and Futaba ing down the prop backplate washer and both blades are feathering on the same radio. They still work flawlessly even after a drilling out the flywheel slightly so the axis. few crashes. The 735 servos sometimes flywheel and cooling fan assembly will all 4. The Legend is the only helicopter kit make a humming noise during idle. That's fit together. on the market with a thrust bearing to normal; the servos are just trying to main­ Before I make any comment on the support the 10mm main rotor shaft. In tain a given position. I hear that noise on Legend's flying qualities, let’s go over some aerobatics, model helicopters may ex­ my J R 4001 coreless motor servos, too. The of the outstanding design features that led perience up to four or five G ’s. The thrust biggest reason I am impressed with my 735 me to build it: bearing relieves the loads on the main rotor servo is its dependability. A year ago, while 1. It is extremely light. With a 1200 mAh shaft radial bearing. I was changing the wires on a gyro, I receiver battery pack, the gross weight is 5. The autorotation bearing employs shorted some wires and suddenly smoke less than nine pounds. (Most .60 machines three roller bearings instead of a single came out of one of the 735 servos. I are around nine to ten pounds.) bearing as on less expensive machines. thought, oh &$%, there goes $60. After the 2. It has triple ball bearings in the tail 6. Excellent steel clutch. It is the legen­ smoke cleared, that little servo still worked! rotor blade holders: two radial bearings dary design used on GMP Cobras and I was impressed. To give you another and one thrust bearing. This provides ab­ Competitors. example, some of my flying is done in the solutely minimal slop in tail feathering 7. Many interchangeable parts with the

JULY 1989 101 SUBSCRIBE NOW FEATURING: Construction Articles AND SAVE! W Product Reviews Radio Control Yes, start my subscription Peanut Plans 0 to Model Builder! Electric Flight □ New □ Renewal Old Timers Name Address City. State □ $25.00 for one year (12 issues). Over $10.00 off newsstand prices. □ $47.00 for two years (24 issues). Over $23.00 off newsstand prices. M/C or Visa if (Add 5%) Expiration Date Signature $38.00 for one year (includes postage), MODEL outside U.S. including Mexico and Canada. For two years (24 issu e s) se n d $68.00. ALL PAYMENTS MUST BE IN U.S. FUNDS DRAWN ON A U.S. BANK BUILDER MODEL BUILDER 898 W. 16th St., Newport Beach, CA 92663 WORLD’S MOST COMPLETE MODEL AIRCRAFT PUBLICATION

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$25.00 for one year (USA, including FPO and APO). $47.00 for two years (USA, _ including FPO and APQ). For protective ■ mailing bag, add $3.00 for one year, $6.00 for two years Begin my subscription with the______issue. For overseas subscriptions, (one year, Mastercard or Visa number: including Canada & Mexico, but not Expiration date______Signature______APO or FPO: $38.00. Two years, $68.00. R/C MODEL CARS 898 W. 16th St., Newport Beach, California 92663 Payment must be in U.S. funds, Name ______ADDRESS drawn on a U.S. bank. CITY ______STATE______ZIP Cobra and Competitor. Competitor. I give the Legend an A for 8. The sturdy .080-inch thick aluminum structural integrity. The only weak link is side frames are pre-drilled and designed the landing gear retention strap. The four for either a belt driven or shaft driven tail steel straps that hold the landing skids to rotor. The kit comes with belt drive, but the landing struts only use one bolt on the Cobra/Competitor gear drive unit will each strap, which allows the skids to rotate fit, too. after a few bounces. The Legend instruc­ 9. The toothed belt tail rotor drive sys­ tions tell you to drill and install a screw tem is very light and efficient. through the strap and the skid to prevent 10. The tail rotor is a pusher design. It is the skid from turning, which is satisfactory. located on the right side of the helicopter, Since the Legend only weighs 8.5 pounds, which is aerodynamically more efficient the landing struts and skids have survived and provides better heading control. very well. However, I would prefer the 11. I prefer the sliding tail rotor pitch double-bolt retention strap as used on the control (also used by Heim, X-Cell, Kalt GMP Competitor. Omega, and Concept) over the classical The pictures and the instructions show sliding wire method. the Legend struts raked forward. Recently, 12. Like the Schluter Champion, the I started raking mine backward. I think that Legend kit comes with a special tool to looks even better. Furthermore, raking the hold the flywheel/fan assembly as you struts backward makes the helicopter sit torque down the engine prop nut. more solidly on the ground because the BE USED FOR-FIELD 13. Hirobo/GMP is well known for ex­ vehicle’s CG will now sit in between the MAINTENANCE · CARRIER · cellent machined parts in all of its heli­ two landing gear straps. BUILDING/ALIGNMENT JIG · copter kits. The slopless inline swashplate How does the helicopter look? Quite PAINTING JIG · STORAGE is an example. pretty. Especially on a nose-high flare in an 14. A simple main rotor blade pitch autorotation. All the parts on the Legend STAND · gauge is included in the kit. are anodized metallic grey—quite an in­ COMES COMPLETE WITH 15. All the control arms and bellcranks teresting color change from the familiar are fitted with ball bearings for ultra­ black color as used on the Competitor and BUILT-IN TRAY AREAS. smooth operation. Stork. It’s nice to see a manufacturer try AVAILABLE AT YOUR LOCAL 16. Simple slide-off canopy like the one something to deviate from the norm. So used on the Shuttle. far I have seen quite a few other Legends, 17. Cone start feature on the engine. but most of them have color schemes 18. Rear facing engine cylinder for easy similar to mine. Well, mine is a copy of the access to the glow plug. scheme on the box cover. You will see 19. The horizontal and vertical fins are other Legends painted just like mine. P. 0. B o x 1247 made from Magnalite composite material Unlike a full-fuselage model helicopter, St. Charles. IL 60174 to reduce weight. a pod-and-boom chopper doesn’t take 20. Special metal straps to support the much time to get it flying. I only put in tail rotor control guide tube. about 20 hours, which translates to one 21. There are probably some other de­ week of evening work. Some will be able MULTIPLEX MODELTECHNIK sign features I haven’t discovered. to build it in one weekend. Finishing the Putting the Legend together was a simple main rotor blades took over an hour be­ Gmbh of West Germany offers to you: job because I have built quite a few GMP cause I made sure that the lead weights —True narrow-band conversion technology Cobras and Competitors. Their layouts are were well epoxied in the slot. Nothing —The finest equipment similar. The instruction set is good. It comes would be scarier than seeing a two-ounce —Competitively priced in four volumes: Basic Assembly Manual, lead weight shooting out at a bystander — Beemer-Multiplex VIP Service Control Setup Manual, Rotor Blade Man­ with the rotor turning at 1700 rpm. I was (The best) ual, and How to Fly Manual. There is no told that many years ago, one flier was hit —Full stock of accessories and parts excuse not to build the kit properly. by a lead weight and it put a hole in his Send $5.00 for new catalog in English The Legend has heavy duty .080-inch lower leg. Before epoxying the weight in, I or call us: (602) 483-9577 thick aluminum side frames. My GMP Spe­ take a flat screwdriver and scribe about 40 cial Edition Stork also has the .080-inch cross-cut grooves all around the soft lead. thick side frames. Even after many crashes, This helps the epoxy to grip the lead BEEM ER R/C WEST DISTRIBUTORS INC. my Stork still has the original side frames. weight. You should use slow cure 30- 7725 E. Redfield Rd.. Suite 102 When the Cobra first came out in 1984 it minute epoxy (not 5-minute epoxy) so the Scottsdale. Arizona 85260 had .062-inch thick side frames, which epoxy has time to settle around the lead usually bent in a crash, which meant pull­ weight. ing the engine out and tediously straight­ If you would like to speed up your con­ ening the engine starting shaft until the struction time, try the new GMP helicopter ting and/or lean out the engine slightly, dial indicator showed a shaft runout of less tool kit. I started using one last month and I that should alleviate the vibration. Nowa­ than .003-inch. For the last two years all the love it. With a retail price of $49.95, it is a days the quality of any brand of model Cobra kits have come with the thicker collection of German-crafted chrome rotor blades is very good, and each blade .080-inch side frames. The Legend side vanadium metal Allen drivers, nut drivers, in a pair usually is never more than one frames may actually be even better than and screwdrivers. There is also a needle- gram away from the other blade. If you are the Cobra side frames because the Legend nose plier, a ball link plier, Locktite, and a fortunate enough to buy a set of the ex­ uses 5052-H32 aluminum for these instead pitch gauge. All of these fit in a compact pensive but high quality fiberglass blades of the Cobra’s 6061-T4 aluminum. 5052-H32 black leather case. made by Sitar, Vario, Peka or Miniature is the more ductile of the two, thus you are As usual, 40% of my time was spent in­ Aircraft, then you have no balancing act to less likely to get stress cracks near the stalling the radio and adjusting the control juggle. With a new set of wood blades, I landing gear area. linkages. I spend a lot of time on control usually just epoxy in the weight, put on the The Legend is extremely robust. I have setup so I can be confident that a new ship covering material, then lay out the two tumbled mine on the ground a few times will be ready to rock and roll from the first blades end to end and put a 4mm bolt with no harm done. The octagonal-shaped flight. On the first flight the tracking looked through both blades and tighten them with tail boom seems to be tougher than the perfect, with no vibration. If there is vibra­ a 4mm locknut. Then I use my thumb and round tail boom on the Cobra or the tion, try lowering the collective pitch set- index finger to hold the bolt and let the

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two blades teeter, adding trim tape until the cyclic stick fore-and-aft and side-to- invert switch. Since the Quantum is de­ the blades teeter level. Most of the time side to check the control sensitivity. The signed for F3C level contest fliers where my helicopter will not vibrate. If upon flight Legend was very responsive. I was using there is no requirement for inverted flight, test, there is vibration, then arbitrarily add the exponential feature on the radio so the the Quantum does not have an invert a two-inch square piece of tri m tape to one control feel was excellent at hover; no sign switch. of the blades. If the vibration gets worse, of overcontrol. If you have this exponential The transmitter has two rev mix switches. peel it off and stick it to the other blade. feature on your radio, then you should try Turning them on allows the pilot to dis­ Bingo. it. Exponential control may improve your engage the tail rotor mixing as the idle-up precision hovering. switch is flipped for aerobatics. This is Now, let’s talk about flight performance Next, I checked the ATS tail rotor mixing. necessary for roll because you don’t want and the Quantum radio. On the first flight, Increasing the collective from middle stick the tail to yaw left as you feed in negative with a few clicks on the trims here and to 3/4, the Legend climbed rapidly and the pitch. There is also a rudder preset switch there, the Legend was in a stable hover. To nose yawed to the left a little. No sweat. which will kick the tail rotor into a preset check the trim, I usually take both hands Cranked up the ATS on the Quantum two position when you hit the throttle hold off the sticks. Well-trimmed and well- clicks. Now the ship climbed straight up. switch for practicing autorotation. This designed helicopters should maintain a One elegant touch on all Airtronics heli­ feature might be useless on most helicop­ hands-off hover for three to four seconds. copter radios is that they all come with a ters because the tail rotor stops turning The Airtronics SG-1 gyro was functioning miniature plastic screwdriver that can clip during autos, but rudder preset is useful superbly. It guided the Legend on a set onto the transmitter carrying handle. This for many specialized contest machines heading and held it there. The SG-1 gyro facilitates flight testing because on most where pilots use a “ driven tail rotor” sys­ has an in-flight selectable sensitivity fea­ high-tech programmable heli radios you tem, in which the tail rotor is still engaged ture. I set my high end sensitivity at 40%. need a small screwdriver to adjust the trim in an auto to achieve heading control. The low end setting on the gyro was at pots on the transmitter to fine tune the (Full-sized helicopters all have driven tail 25%. For hover I usually switch the gyro to helicopter. rotors.) The rudder preset trim is used to high sensitivity; for forward flight and A top heli radio like the Quantum can dial in sufficient tail rotor pitch to null out aerobatics I switch it to low. Next, I rocked truly enhance a helicopter and make the the torque due to friction in the bearings pilot look really great. The smooth sticks and tail rotor drive system. Like I said, the add finesse in flying. The Quantum trans­ Quantum is a top-of-the-line heli radio SCALE DOCUMENTATION PLAN ENLARG­ ING Photopacks, three-views, drawings for mitter’s stick tension can be adjusted by with awesome servos designed to do the 1800 aircraft. Super Scale R /C plans for Giant, opening the back of the transmitter cover. job. The rudder preset may also be en­ Sport 82 page catalog $4 00 Scale Plans and The high and low end collective pitch trim gaged to kick in a preset amount of tail Photo Service. 3209 Madison Avenue, Greens­ is conveniently located on either side of rotor when idle-up 2 is switched on. The boro. North Carolina 27403 (919)292-5239. the transmitter. For the discriminating flier, rationale is that you can trim the tail rotor POSITION WANTED. Full-time position wanted the radio has four separate pitch curves; for hover; when you are ready to fly for­ in hobby shop. Mature 48-year-old, 35 years in one for auto, two for the two high-idles, ward, switching on idle-up 2 which will aviation. Modeler of 40 years. Will relocate any­ and one for normal flying. Each pitch curve give you not only the forward flight pitch where. Please call (207)646-1544. Mr Frank has its own high and low pitch adjustment curve and forward flight engine curve, but Martin, P.O. Box 683, Ogunquit. Maine 03907 trim pots. Most heli radios come with only also a forward flight tail rotor trim. Thus, one high-idle. Top radios like the JR PCM you do not have to hold left tail rotor as OLD TIMERS built by Dale Myers. Beautiful — 10 and Futaba 1024 have two high-idles; you normally would. Isn’t that nice? light — transparent — electric or gas. Lanzo's Record Breaker 96" — Pacer "C" — Strato idle-up 1 may be used for general flying to Throttle, elevator, aileron, and rudder Streak 66" — Berkley Currier Sportster — Pa­ maintain a healthy rotor rpm at low col­ channels all have travel volume adjust cific Ace 72" — Schoenbrun's "Gladiator" — lective stick, while idle-up 2 is switched on (TRV). This feature facilitates setting up the Diamond Demon — Playboy Sr. 80" — New for aerobatics such as loops and rolls, control sensitivity of any helicopter. Yes, I York Aero Nuts "Rambler." Dale Myers. RD # where negative collective pitch is fed in at know there is no elevator, ailerons, or 3. Stewartstown. Pennsylvania 17363 (717) 993-6246. the upside down portion of the maneuvers, rudder on a helicopter. They only exist on or to fly upside down without hitting the airplanes, but all the radio instruction

JULY 1989 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! 105 throttle stick position by simply pushing a weight. At 8.5 pounds gross weight, this MODEL# button at the back of the transmitter. Since must be the lightest of any .60 size R/C this is done electronically, there is actually helicopter. Hit full throttle and this baby BUILQER a small Ni-Cd battery hidden inside the takes off like a rocket. Maybe I ought to All Full-Size plans purchased from MODEL BUILD El· transmitter to remember the setting even measure its vertical 0 to 60 time. Do you Magazine include a reprint of the construction article, I' when you disconnect the 9.6-volt main need all that power and speed? Well, I am building instructions were part of the article. battery pack. Fancy! The hovering memory glad there is no traffic law that says model SEND TO: MODEL BUILDER PLANS SERVICE 898 W. 16th S t.. Newport Beach, CA 92663 is useful because it defines where your helicopters must fly under 55 mph. So why throttle stick is when you are hovering. not enjoy life to the fullest? This way the tail rotor "up" mixing adjusts How is the aerobatic capability? My fly- Minimum order: $10.00 tail rotor mixing for throttle stick above the barless Legend does very nice three- NEW ORDERING INSTRUCTIONS hovering setting, and "down" mixing for second axial rolls. Loops and stall turns are U.S. orders, including APO and FPO, add below the hovering setting. On most other effortless. Venturous pilots might want to 20% of total order for shipping and handling. heli radios, the hovering point is set by try the full "Kelvin" snap roll: hit full right Overseas orders (includes Canada and turning a knob. The advantage of the Air­ aileron, full up elevator, full left rudder Mexico) add 50% of total order. Remit tronics hovering memory button is that and zero collective pitch and pray that you payment by International Money Order or you don’t need to look at the transmitter have checked all your ball links. My friend U.S. funds, drawn on U.S. bank. Please, no when you are concentrating on hover. Just Kelvin claims it under his name because he cash or C.O.D.’s. Mastercard or Visa include popping into a hover and simply touching says he is the first one to try it. I do this card number, expiration date, and signature. the memory button will set the hovering maneuver frequently on my Cobra, but Add 5% to credit card orders. California point. once I pushed it beyond its flying envelope. residents add 6% sales tax. Of course, the Quantum is the only radio A link must have popped because I saw the with the synchronized elevator feature blade pitch go to 90 degrees after a No. 7891 TIGERCAT Mk. II SI 5.00 Very pretty scale-like low-wing sport model. which can significantly alter a helicopter’s three-and-a-half snap roll and a high-G, 60" span, .65 4/c. By Bob Benjamin. flight dynamics. This interesting topic de­ full elevator, full collective pull-out. The serves a column by itself, so stay tuned for a blades stopped in the air and the Cobra No. 7892 STINSON MODEL U" SI 200 future "Chopper Chatter” column. Besides tumbled to the ground from 100 feet. The Profile scale C/L version of the colorful 1930s the essential features that help fine tune only damage was a chewed-up main gear. airliner for three 1/2A’s. By Mike Keville. the helicopter, the Quantum has an LCD The frames and landing gear were straight­ No. 1173-O.T. TRENTON TERROR S8.50 timer and an LCD RF power display. The ened and ready to fly in an hour. Amaz­ Gas job from 1938 Flying Aces. Span 72". LCD timer can be activated and stopped ingly, the Yale blades did not even break. Simple lines. Designed by Mickey DeAngelis. by touching a button conveniently located Those Yale blades can survive almost any­ at the back of the transmitter case. Other thing. They are so hard they once chopped No. 6891 SEA FLI XI S I2.50 convenient features include a flashing LED my friend's helicopter tail boom clean off Composite foam/fiberglass R/C seaplane for .60 to .90 power. By Francis Reynolds. to warn you if the throttle hold is on, or in a tail boom strike. Just make sure they idle-up is on. The count-up/ countdown don’t hit you. The moral of this story is to No. 1174-O.T. LANZ0 STICK S7.50 Rubber stick winner. ’40 Nats. 4-1/2'. Still timer features a very useful audio beep at check all your controls before flight. I must good in Unlimited. By Phil Bernhardt. every one-minute interval, and beeps have had a loose link or bind somewhere every second during the final ten seconds. because the throws were maxed out and manuals use these terms—probably be­ Like all PCM radios, the Quantum PCM 8H set up for inverted flight, too. The Kelvin cause they are easier to say than fore/aft has a failsafe mode which automatically snap roll is a very violent but spectacular longitudinal cyclic, lateral cyclic, and tail sets the servos into a pre-programmed maneuver. rotor yaw control. The throttle travel adjust setting, or you can choose to let the servos Any intermediate flier would not have a is especially useful to ensure that the car­ maintain their last positions when there is a problem performing aerobatics with the buretor opens exactly 100% at full stick, loss of signal. So far I have not had the Delta-3 flybarless head. What is the Delta-3 and shuts tight at low stick and full low need to use this feature. Or maybe the flybarless head, and how does it handle, throttle trim. The rudder, elevator, and radio has already kicked in the failsafe compared to a flybared helicopter? Delta-3 aileron channel each has dual rate and mode a few times, and saved my helicopter is a technique derived from full-size heli­ exponential control. The pilot has three without letting me know. copter rotor design. The main rotor head choices when he hits the dual rate switches What's more important than features? pitch link is simply displaced slightly from on the outside of the transmitter: Reliability! I have flown Airtronics heli the rotor teetering or flapping axis, thus 1. Traditional dual rate (linear high rate radios for the past two years, and none of when the blades flap up due to disturbance and linear low rate). them have failed, even after some very the blade pitch will change automatically 2. Selection of linear stick control or nasty crashes. The radios have been to help stabilize the blade. Proper Delta-3 exponential stick control. through very hot summers and freezing angle can improve a helicopter's stability 3. Fancy exponential dual rate (ex­ winters and they still function flawlessly. slightly. ponential high rate and exponential low The Airtronics receiver is of the dual con­ For years, there existed a myth that fly­ rate). I chose the third option because version, narrow band design which has barless helicopters are unflyable. I guess exponential control gives a very soft con­ excellent noise rejection ratio, and com­ this myth has been broken. The smooth­ trol feel when the sticks are near neutral. plies fully with AMA’s 1991 requirement. ness and stability of the Legend have sur­ This helps prevent P.I.O., or pilot induced The dual conversion receiver design has a prised me. I think it would impress other oscillation, which is due to the pilot over­ much better noise rejection capability than finicky pilots, too. Even novice pilots would correcting the helicopter. the balanced mixer type receiver as used have no problems handling the flybarless Like all Airtronics helicopter radios, the by less expensive radios. This is an impor­ Legend. At one point I handed the trans­ PCM 8H comes with a removable plug-in tant consideration when you buy a heli­ mitter over to one of my novice students. transmitter battery pack. On a normal fly­ copter radio. In fact, every new radio in He hovered it solid as a rock. I asked him ing session I always put in at least six flights. Airtronics’ line meets the 1991 20 khz nar­ how does it feel? He says it’s just like The receiver battery pack can be quick- row bandwidth requirement. So, get ready hovering his Champion. charged very well at the field, but the for 1991 and get your own Quantum. Yes, I To better judge the Legend, let’s study transmitter battery is 9.6 volts, and the 12- know the extra couple hundred dollars is the physics of the flybar. Most modelers volt car battery usually cannot charge it at not a small amount, but the value is there. are used to seeing a stabilizer bar atop R/C high enough current. Therefore, I bring an OK, ready for the big time? Let’s hit full helicopters. The stabilizer bar is nowadays extra fully charged transmitter battery collective and see what the Legend is made only used on model helicopters. The full- along. of. Full collective response is out of sight! size Bell Jet Ranger, Bell 222 and Robinson The Quantum radio has a memory hold In the March/April issue I explained that R-22 do not have them. The stabilizer bar is feature that allows you to set the hovering acceleration is dependent on the vehicle used on model helicopters to help stabilize

106 WHEN CONTACTING ADVERTISERS, TELL’EM MODEL BUILDER SENT YOU! MODEL BUILDER them. The principle is that it can teeter freely atop the rotor head so it acts like an inertial reference for the main rotor sys­ COVERUP! tem. If a gust suddenly tilts the fuselage and the main rotor disk, the stabilizer bar will not tilt with them because it can teeter Sturdy, high quality, rich dark freely. It’s like a toy top; it will stay upright green vinyl-covered binders for and level by itself. By linking the main rotor your valued copies of MODEL blade pitch arms to the stabilizer bar, the A Nationals Winner BUILDER Magazine. Gold lettering bar can act as a mechanical feedback sys­ The “Heinke!” He 100-d on spine and front cover. tem to provide inputs to the blades to help 24" Wingipon — Rubber Powered Flying Scale stabilize the main rotor disk and thus the $ 1 5 .9 5 Kit «110 Your ok) building skills «nil enjoy the experience Time too entire vehicle. By removing the stabilizer to get your son learning hour A beautiful kit in the Flyllne tradition, contest winning flight ability Decals. Canopy and bar, you are removing a nice assistance. So Spmner are included Quality balsa, a kit wo are proud of why remove the stabilizer bar? One major Wo ve got a whole line of old favuniM Please send 50c for our Flyline Catalog reason is for scale effect. You don’t see a Phone 1703) 273-9593 Dealers and Distributors are invited. fly bar on the real Jet Ranger, so why should FLYLINE MODELS, INC. a model helicopter have one? I think scale ______P.O, Bo» 2 m , Folrlox, Virginia 22031______contest judges should award extra points for realistic looking main rotor heads, such as a flybarless head. The other reason you who practices autos on his Juniorwith 110- might want to try a flybarless Legend is that gram blades. He has almost no reserve it's unique and different from all the other energy at the bottom of an auto, so if he helicopter kits on the market. It provides a miscalculates his timing for the flare, then different control feel. Not necessarily more he has bought the farm. In contrast, I can difficult, just different. I have seen novices auto in my Legend, hover for a second and flying around with flybarless Legends. My nudge it over to the targeted landing spot. One Binder...... $695 friend, who is a novice flier, flew mine and I have seen X-Cells with heavily weighted Three Binders...... $17.95 loved every minute. Through careful engi­ blades do beautiful autos, too. Just make neering, such as proper rotor stiffness, sure you epoxy the weights in securely. Five Binders...... $27.95 blade weight, blade weight distribution, The other reason that a flybarless heli­ (For more tnan 5, include airfoil shape, vehicle inertia, etc., flybarless copter might be preferred over a flybared $5.00 for each additional helicopters can be engineered to fly very helicopter is that flybarless helicopters are binder.) well. My Legend loops and rolls with ease. more agile. This has to do with the stability There are no nasty traits that will keep you of the system. For example, the Grumman Shipping: Binders shipped in U.S. by on your toes. The only noticeable differ­ X-29 forward swept wing experimental jet UPS only. For one binder, add $2.25. For ence between the flybarless Legend and fighter is designed purposely to be inher­ each additional binder add $1.00. For the flybared Prohead Legend is that when ently unstable. This is called “ relaxed static binders shipped outside U.S. , add $6.00 you chop the throttle suddenly, or during stability.” An inherently unstable vehicle is a quick stop maneuver, the nose tends to much more maneuverable than a stable for one binder. For each additional pitch up slightly more. But do not be vehicle, however, it is difficult to control. It binder, add $4.00. For Air Mail rates over­ alarmed, it is very mild and you will be­ might not even be controllable. For exam­ seas, please inquire. come accustomed to it very rapidly. If a ple, try to balance a pencil vertically in novice can enjoy the flybarless Legend your palm. I bet you can’t do it. It is such an PLEASE. . All payments must be in U.S. after one flight, then think how much fun unstable system that you just can’t react funds, drawn on a U.S. Bank. the intermediates and experts will have. fast enough to do it. But you can balance a California residents add 6% Sales Tax This nose-up phenomenon is due to tall broomstick in your palm even though angle-of-attack instability and speed sta­ it is also an unstable system. The reason is bility which all helicopters possess. The trait that balancing the pencil requires a quicker MODELS' is less noticeable on a flybared helicopter "reaction time." This is the reason why BUILDER because the stabilizer bar masks it slightly. R/C helicopters are more difficult to fly The physics of this will have to be dealt than real helicopters. But, at the same time, 898 W. 16th Street with in my “ Chopper Chatter” column. R/C helicopters are much more maneu­ To check out the Legend’s full potential, verable. You don’t see a full-size Jet Ranger Newport Beach, CA 92663 I paid a visit to Robert Gorham while I was doing a 540° stall turn. By making the in California to see him fly. Boy, can he fly! Grumman X-29 fighter aircraft inherently His normal routine is to start the engine, unstable, aircraft engineers have made the pop the machine into a hover, then peel vehicle very maneuverable. However, the out vertically, flip it over on its back and do pilot can’t cope with that, so a fly-by-wire • W A N TED · EDITORIAL ASSISTANCE a split-S, followed by lots of high-G computer controlled autopilot system is maneuvers. I wouldn’t want to be sitting necessary to make the X-29 flyable. The RCMB Publications is looking for some­ inside that model. Of course, as shown in result is an agile fighter, yet it can be tai­ one to assist in the production of three magazines. The qualifications necessary the photo, inverted flight on the flybarless lored by the computer to make it as easy to include a command of the English lang­ Legend is a breeze for him. I would suggest fly as the pilot desires, even hands-off for uage, a knowledge of magazine product­ you follow the Legend instructions and some time. Now, think of the flybarless ion, including layout, paste up, ad pro­ build it accordingly and you will be re­ Legend as the X-29. It is very agile due to duction, and proofing. Position offers warded with a fine flying machine. The key the removal of the stabilizer bar, but the opportunity for the successful can­ to the Legend’s nice flying qualities is the didate to grow with the company in an through careful engineering in the rotor atmosphere of close cooperation and a rotor blades, so you ought to stick with the system, rotor blades, and the vehicle itself, rewarding future. Experience in model stock Legend blades for a while before you it has been tailored to be very stable. Well, building is a plus for the position. Send adventure into more exotic blades. The I guess the best proof is for you to build application and resume to Wm. C. side benefit of the 165 gram weighted one and try it yourself. I think you will be Northrop. RCMB Publications, 898 blades is there is plenty of stored inertia for pleasantly surprised about how nice a fly­ West 16th St., Newport Beac6 CA autorotation. You can practically hover the barless machine can fly. Then your buddy 92663. (RCMB is a NON SMOKING office) model for a couple of seconds after the will want to borrow yours. flare. I think this is a bit unfair to my friend The flybarless Legend retails for $599,

JULY 1989 107 A CUT ABOVE Precision cutting instrument out­ lasts the competition by ten to one.

The Ubcr Skiver was designed to meet the precision require­ ments ol photofabrication, microcircuitry, graphics arts pro­ duction, etc., and as such becomes the perfect cutting tool for the discriminating modeler.

Long Life Stainless Steel Blades Availiable in seven satin anodized handle colors: silver, blue, red, green, gold, black, and violet Rear Draw Bar Clutch Complete set in fitted hardwood case; includesUber Skiver, together with two vials containing Instrument Quality Materials four No. 11, and one each of Nos. 10, 12, 15, and 20...... $16.95 Advance Collet Design See your dealer, or order direct. Orders are shipped ...... __ First Class in the U.S. Add 10% of total order, in d ivid u al handles (specify color)...... $6 95 Hex Cross-Section overseas air mail, including Canada & Mexico, add Vial of 6 blades (No. 10, 11. or 1 5 ).....$4.00 Deeply Knurled Grip 50% of total order. Remit by International Money (^n 19 nr 9nj ^ Blades can be resharpened Order or U.S. funds drawn on a U.S. bank. Postage is paid on APO and FPO orders. Calif, residents a d o VISA and MASTERCARD 6% sales tax. Dealer mqumes ,netted. 9 ^ add 5%. and include expir­ ation date and signature. MODEL BUILDER PRODUCTS California residents add 6% sales tax. 898 W. 16th. St., Newport Beach, California 92663 Minimum order: $10.00 the flybared Legend for $625. Both heli­ dope to waterproof and fuelproof the tis­ Society is (707)424-5598. To find out more copters come with precision bearings on sue, the weights are going to be more about this project, and how you may be­ all the moving parts. I have flown both equal. Solarfilm states that in the translu­ come involved, contact any of the above. versions. The f lybarless version is extremely cent tissue colors; yellow, orange, red, and For scale buffs, there are picture sets and a stable due to the special rotor blades. It blue, the material weighs slightly less than VCR tape available. definitely has a slightly different trait than an ounce per square yard. In scale colors; WHAT IS FREE FLIGHT? the flybared version, but you will grow antique cream, WW I dark green, black, Old Timer modeler Mike Guarnieri (Re­ accustomed to it quickly. Anyone who can and silver, it weighs an ounce per square member the MG?) stopped by our booth hover a helicopter can handle the flybar- yard. The sheets come approximately 20 at the WRAMS show to make a tongue-in- less head confidently. For beginners, I inches wide by 36 inches long, with the cheek comment about my not under­ suggest you purchase the flybared version. grain going the long way. The lightness standing free flight (see my January '89 You can remove the flybar at a later stage. and toughness of this material will make it column). He went on to give me a defini­ Any questions? Airtronics will be glad to attractive to free flight, control line, and tion of the term “ Free Flight,” and stated answer your radio questions regarding the R/C modelers. Our impression, when first that he was sure I was an expert according products I have mentioned. Call them at seeing and handling LiteSpan, was similar to this definition. "Free Flight” is going to (714)830-8767. Have a question on building to the reaction we had when first seeing the local R/C flying field without your or flying your Legend? You can get free and using Super MonoKote . . . a revolu­ radio, field box, and model. You then technical help from GMPat (818)992-0195. tionary model building product. Solarfilm check the sky for the model that interests Of course, you can always call me at (301) has an agreement with a California com­ you the most, sidle up to the pilot and 589-0855 or (301)454-8601 on any helicopter pany that will soon announce availability comment on what a nice looking airplane related question. · of LiteSpan in the United States. he’s flying, then ask him how it handles. SWAMP GHOST Nine times out of ten, he’ll proudly offer That’s the name of the only B-17 left in you the transmitter to find out for yourself. Workbench . . Con tinued from page 11 the world in its original combat con­ In order to avoid risks and to make it more use as a paintable surface on balsa and figuration. The Papua New Guinea gov­ likely that you’ll get future offers of a "free other solid surfaces.” It sure looks and feels ernment has just officially given permission flight," don’t shoot touch-and-goes or like tissue; smooth and shiny on one side, to bring the “ Swamp Ghost” home to landings, and try to return the transmitter duller on the other side. It has a definite Travis Air Force Base. Obviously, it’s not all to the owner before the engine runs out of grain pattern and will tear easily, like tissue, as simple as that, and there are many re­ fuel and you may be forced to land dead- with the grain. But trying to tear across the quirements and obligations to be fulfilled stick. With the proper diplomacy and care­ tissue will raise your eyebrows. It will before the project is complete. The Travis ful observance of the rules, you may get in eventually tear if you pull hard enough, AFB Historical Society, P.O. Box 1565,Travis more flights than you would if you brought but prior to that, it stretches and distorts, AFB, California 94535, is the focal point of your own airplane, you get a variety of but refuses to let go! Out of the package it this whole effort, and the Project Manager flying experiences, and best of all, you is not as light as good quality Japanese is Bob Gonzales, 2700 Waltrip Lane, Con­ avoid ail the messy cleanup and packing of tissue . . . but the real tissue is not doped cord, California 94518, phone (415) the R/C gear in your transport. Man . . . either. By the time you've put on enough 798-5100. Phone number of the Historical that’s REAL Free Flight!" ·

108 WHEN CONTACTING ADVERTISERS, TELL EM MODEL BUILDER SENT YOU! MODEL BUILDER B Y FO U R .

THE ATTACK 4NBL 4 X 4 ATTACK Our newest 4 channel system There’s even a surface Attack has something for everyone. In fact, 4NBL system on 75MHz. Supplied the Attack 4NBL is such a versatile with three S148 servos and R114H re­ performer we’ve customized it for all ceiver, this ground and sea outfit has kinds of radio control fun.

ATTACK ELECTRIC The 4NBL/MCR system is destined receiver and a MOSFET speed con­ to become a favorite with electric flyers. trol into one very compact, very light This Attack system comes complete and very efficient package. It also with our new MCR-4A integrated re- incorporates BEC to eliminate the ceiver/speed control. This remarkable need for, and extra weight of, a re­ device incorporated a four channel ceiver battery.

The ergonomically designed T4NBL transmitter SILENT ATTACK features comfort contoured case and adjustable There’s a 4NBL system for sail­ length control sticks. plane flyers, too. With the Attack glider what it takes for gearbox-equipped package you get a pair of S133 servos, 4x4’s and RC boats. R114H four channel receiver and a No matter which 4NBL system you 250mAh NiCd pack. Again, when size choose, you’ll also get our new four and weight of the airborne package is channel Attack transmitter. critical, Attack is the answer. Loaded with extras like adjustable Hooked up with stick gimbals, servo reverse switches a pair of S133 micro Transmitter/T4NBL servos, this system is and a rechargeable NiCd pack, the RECEIVER SERVOS BATTERY FREQUENCY TYPE perfect tor electrics T4NBL transmitter also features a like our HirobolFutaba MCR-4A S i 33(2) BEC 72MHz Etectncs Professor. R114H S133(2) NR-4K 72MHz Sailplanes comfort contoured case and neck- R114H S148<3) Dry C ase 72MHz Aircraft strap for fatigue free operation. R114H S148(3) Dry C a m 75MHz Truck/Boat

ARF ATTACK Looking for the perfect system for ARF and conventional sport aircraft? Once again, it’s Attack to the rescue The MCR-4A four channel receiver/MOSFET speed Futaba with a high value package including control weighs just 1.S oz. and can easily handle Futaba Corporation of America 280 to 540 size electric motors. 1.24* * 2.92" * 0.63." R114H receiver and three S148 servos. 4 Studebaker/lrvine, CA 92718 714-455-9888 £1988 Futaba Corp. Hop up your Grasshopper II, soup up your Super Sabre, get the max from

your Midnight Ball bearings for smoother running assembly onto your car. Or depending on Ball bearings are a must for increasing your model, you may want to add shocks Pumpkin and the performance of your buggy by reducing for improved handling. And depending on friction. Ball bearings on the front axle the model you own, you could opt to boost your boost cornering ability. And ball bearings replace the original equipment ball joints on the rear allow more motor power to with rugged, low friction rod ball ends. Blackfootwith the drive wheels. So MRC-Tamiya offers They’ll provide for less play in the steering a number of ball bearing sets that are and speed control linkages, and require genuine specifically designed to make your buggy less maintenance, too. run faster, smoother, and longer. The real pros have even found that a little Tamiya Switch Lubricant can help their MRC-Tamimparts. Tires with true grip Tamiya buggy perform better. It coats the Tires with superior tread design will electrical contacts providing maximum enhance the cornering ability of your buggy. power throughout and longer speed control And on the rear, they’ll help transmit more life. And Tamiya's special Ceramic Grease power to the track without loss of traction, offers tough protection for gears, shafts, giving you better acceleration. axles and joints, by reducing friction, and Tamiya has engineered 20 different sets wear, thereby allowing more power to the of off-road tires. wheels. MRC-Tamiya R/C off-road buggies are The list goes on and on, from pinion where the action is. They're exciting. gear sets that will give you more low end or They’re fun. high end torque, to complete chassis sets And a big part of the fun is the available for maintenance...they’re all produced with parts you can buy to coax the maximum out the same perfection that has made of your machine. There are parts for MRC-Tamiya the leader in R/C off-road. souping up the speed. Parts for modifying So don't miss the added pleasure the the looks and the performance. Parts right part can bring. Ask your hobby dealer for changing the handling from one track to for genuine MRC-Tamiya performance another. And on the rare occasion when parts. Make them part of your hobby...and your buggy needs maintenance, you can do accept no substitutes. it yourself. You built it, all you need is the right part, and MRC-Tamiya makes them all available through your hobby dealer. And because these parts are genuine Tamiya parts, you won't be taking chances. Motors for every need and speed These are made by the company that Perhaps the most important part of your created R/C off-road technology, so you’ll buggy is its motor. So MRC-Tamiya offers know they're quality parts and will fit your 7 different motors from the 380 type which MRC-Tamiya buggy precisely. provides up to 30 minutes on one Here’s just a sample of genuine charge, to the competition Dynatech 01R MRC-Tamiya parts. Space age titanium which provides more power than just about screws in a variety of types and lengths, anything else in its class. for lightweight, long lasting connections. Silicone damper oil in 3-grades— soft, Change bodies, add shocks, improve medium and hard, so you can adjust the performance damping action of your shocks to track And there’s so much more you can do conditions. For the Avante and Vanquish too. Like change the looks of your buggy by Model Rectifier Corportation there's a carbon graphite chassis, the selecting from a number of body styles. 200 Carter Drive ultimate in strength and weight reduction. Each complete with all the parts needed for Edison, NJ 08817