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74820 08545 Radios That Expand Your When you're flying, there's no Capacities. compromise for control. And when you're flying with a Kraft, you're in We'd like to introduce you to two control. radios that you’ll be able to appreciate tor a lifetime of radio Kraft radios. Good old yankee control flying. Radios that expand ingenuity. Distinguished tyy their your capabilities, not limit them. versatility. See these fine flight The Kraft KP5X and KP6C. instruments at your favorite hobby dealer today. Meticulously Engineered. Kraft Systems. Inc. The purchase of a radio is an 450 West California Avenue important investment. Kraft PO Box 1268 engineers understand this. So they Vista. California 92083 created two radios that can be enjoyed by the beginner as well as the experienced competition flyer. Just right to start with, and plenty of radio to grow into, without ever growing out of. Meticulously engineered. Investments of the highest quality.

® J• v ™ T MARCH 1981 1 MARCH

1981

volume 11, number 110

621 West Nineteenth St., Costa Mesa, California 92627 Phone: (714) 645-8830

STAFF PUBLISHER CONTENTS Walter L. Schroder EDITOR FEATURES Wm. C. Northrop, Jr. W O R K B E N C H , Bill Northrop...... 6 GENERAL MANAGER Walter L. Schroder " , . .THREE IF BY A IR ,” Letters to the Editor...... 7 ASSISTANT EDITOR O VER THE C O U N T E R , Phil Bernhardt ...... 8 Phil Bernhardt “ 1 TO 1’ R/C SCALE, Bob Underwood...... 11 ASSISTANT GENERAL MANAGER R /C W O R L D , Bill Northrop ...... 12 Anita Northrop G IANT SCALE FLIGHT LINE, Lee Taylor ...... 14 ART DEPARTMENT R /C P Y LO N , Jim Gager...... 16 Chuck Blackburn Al Patterson R /C S O A R IN G , Dr. Larry Eogel...... 24 OFFICE STAFF A RADICAL SOARING CONTEST PROPOSAL, Dave Thornburg...... 28 Mary Ann Bell H O W T O FLY PATTER N, Dick Hanson...... 29 Edie Downs THE B Y R O N M IG -1 5 , Larry Jolly...... 32 Debbee Holobaugh Pat Patton FUEL LINES, Joe Klause...... 34 A. Valcarsel C HO PPER C H A T T E R , Ray Hostetler...... 35 R/C AUTO NEWS, Dan Rutherford...... 36 CONTRIBUTING EDITORS Dave Brown Mitch Poling PLUG SPARKS, John Pond ...... 38 Otto Bernhardt John Pond Jerry Dunlap Fernando Ramos ELECTRIC POWER, Mitch Poling...... 44 Larry Fogel Larry Renger H A L F -A & SPORT SCENE, Larry Renger ...... 46 Chuck Hallum Dan Rutherford Bill Hannan Tom Hutchinson STEVE MUCK PITCH GAUGE, a i Berry ...... 48 Dick Hanson Dave Thornburg H A N N A N 'S H A N G A R , Bill Hannan...... 50 Joe Klause John Tucker FREE F LIG H T SCALE, Fernando Ramos...... 54 Walt Mooney Bob Underwood C O N T R O L LINE, Dan Rutherford...... 60 SIG "T W IS T E R ,” Jean Andrews...... 62 ADVERTISING MANAGER Walter L. Schroder FREE FLIG H T, Tom Hutchinson ...... 63

SCALE VIEWS R/C MODEL BUILDER (ISSN 0194 7079) is published monthly by RCMB INC., 621 BOEING P-12E, PeteWestburg ...... 30 West Nineteenth Street, Costa Mesa, Cali­ fornia 92627. Phone (714) 645-8830.

CONSTRUCTION Subscriptions $25.00 per year, $47.00for two years. Single copies $2.50. Add $3.50 per KIMBREL DORMOY “ BATHTUB,” Hank iltzsch ...... 18 year for postage outside the U.S. (except SUPER BUCCANEER O.T., Bill Effinger...... 41 APO and EPO).

PEANUT VIRI “ O H-IIK,” Walt Mooney ...... 51 Copyright 1981 by RCMB INC. All rights SKYM ASTERS W A C O Y Q C - 6 ...... 55 reserved. Reproduction without permission prohibited. HANDLEY-PAGE 0/400, Bill Dennis...... 56 Change of address notices must be received six weeks before date of issue that new address takes effect. Send old address with new; old label preferred. Post Office will Cover: Elaine Williams, Fashion Merchandising and Modeling major at Bauder Fashion not forward copies unless you pay extra College, Arlington, Texas, is the subject of this cover shot by fashion photographer Steve postage. Duplicate issues cannot be sent. Petit. Elaine is 20 years old, weighs 110 pounds, and is 5'-5". The what? The model airplane? Oh . . . well, it's a 1/2A "W itch Hawk", designed by Jim Clem. This one was built by Keith Williams, Bartlesville, Okla. Yes, he's Elaine’s Dad. Second class postage paid at Costa Mesa, California, and additional offices.

2 R/C MODEL BUILDER CANDY 20 $79.95

TWISTER-60 $179.95 EXCITING NEW KITS AND 80% COMPLETED A.R.F. R/C MODELS . . . FROM THE BEST IN JAPAN!! CANDY, TWISTER, and YAMATO are 80% completed, factory- built models in traditional balsa and plywood materials, as shown in photo at right SKY MATE is a complete kit. with all parts pre- cut to exact size.

Add $2.00 to each kit for postage and handling. Arizona residents add 4% Sales Tax. COLOR CATALOG OF ALL ITEMS: St.00 [P L A Y T R O N l 344 London Bridge Plaza, Suite D ■ill IIS 1 ^ ------' Lake Havasu City, AZ 86403

FOR YOUR FIELD BOX FUEL PUMP WITH PUSH-BUTTON PRIMING BATTERY TESTER AND CHARGER (FROM AUTO CIGAR LIGHTER)

Power Panel Super Deluxe ...... $2 4 .9 5 E lectric Fuel P u m p ...... $ 1 6 .9 5 Testertron "II in I " ...... $4 9 .9 5

MINI-STARTER FOR SPECIAL MOUNTS. ALSO FOR NEW, HIGH QUALITY ELECT­ ON-BOARD PLAYTRON .049 to .45 ENGINES RONIC AND MECHANICAL ELECTRIC STARTERS. ACCESSORIES FROM THE BEST IN JAPAN.

Minimum order. $10.00. Add $2.00 for postage and handling. Arizona residents add 4% Sales Tax.

344 London Bridge Plaza, Suite D .40 engines...... $2 .95 Lake Havasu City, Arizona 86403 Super-Torque Mini-Starter $2 7 .9 5 .60 engines ...... $3 .95

HIGH QUALITY SPINNERS S.P.N. SPINNERS

3 0 m m ...... $ 3 .2 5 4 5 m m ...... $3 .75 5 2 m m ...... $4 .25 6 2 m m ...... $4 .7 5

40 or 50mm .... $1 .49

MARCH 1981 3 Z t e y Π COMPOSITE KIT

2 METER CLASS COMPETITION SAILPLANE y t y YET A TRAINER EXTRAORDINAIRE

Designed by c o ^ ' y Tom Williams c C ° \

SAILPLANE KIT, MONOKOTE, LAUNCHER etc all FORONLY WingSpan...... 6 feet $54.95 ^ Wing Area...... 573 sq. in.

2 c h a n Sne° lNr I d io I T Typical ™Flying , h o u Weight * R a d ‘ ° ...... 18.. 9 oz. '° z - Wing Loading...... 4.5 oz./ft.2 A irfoil...... FB1151 ABSOLUTELY NOTHING ELSE NEEDED EXCEPT A 2 CHANNEL RADIO Craft-Air is now offering two composite kits, i.e., kits which EVERYTHING INCLUDED... EVEN THE GLUE! are complete except for the radio. • No longer does the new­ comer have to shop again and COMPOSITE KIT again to collect the proper accessories. MAY VERY WELL BE • No longer are potential R/C THE EASIEST TO FLY RADIO CONTROL TRAINER EVER DESIGNED hobbyists lost to the sport be­ cause of the wrong covering, ,1° .oc y y„«■ essary to make repeated trips to the hobby shop to pick up items you forgot, or didn’t Designed by know you needed. Tom Williams • And last, and probably most important, the chances of success of the beginner are CAT. 802 greatly enhanced. Your dealer should recom­ Wing Span...... 6 ft. Wing Area...... 573 in.2 mend his choice of a 2 or 3 Flying Weight...... 24 oz. channel radio and you should Landing Speed...... 16 m.p.h. be able to pick up the com­ (most trainers ...25-35 m.p.h.) Wing Loading...... 6 oz./ft.2 plete ensemble at a very at­ Engine...... 049 reed valve tractive price. Airfoil...... FB1151

20115 NORDHOFF STREET» CHATSWORTH, CALIFORNIA 91311 · (213)998-3700 AN IMPROVED VERSION OF THE NO. 1 1 RC TRAINER___ BETTER THAN EVER!

f t 1981

Designed by CLAUDE McCULLOUGH

WINGSPAN 57-1/4" WING AREA: 635 SQ IN LENGTH: 44-1/4" WEIGHT: 5 LBS (AVERAGE) KIT RC-49 ENGINES: .25 TO 40 CU. IN.

FOR AILERON CONTROL WITH 4 CHANNEL RADIO EQUIP­ MENT OR RUDDER CONTROL WITH UP TO 3 CHANNELS. HERE ARE JUST SOME OF THE IMPROVEMENTS: All new full-size plan. Sturdy aluminum main gear with greater ground clearance Fewer parts, but stronger than ever. Room for larger fuel tank. Quicker assembly Built-in down thrust. More wing area Easier access to nose. Larger ailerons with differential movement horns — Big 36 page building book with more than 150 step- more up, less down for smoother turns. by-step pictures and illustrations.

Plus all the usual value-packed Sig kit items: Separate booklet on flying techniques, die cut balsa and plywood parts, a uminum motor mounts, nylon horns, molded hinges, injection-molded cowling, Tuf-Steel RC links and rods, formed coil spring nose gear, nylon nose gear bearing and steering arm, blind nuts, etc.

g c o t # * * * ! K A D E T m a r n i ! ForCnr RudderDnHHor PnntrnlControl WithW ith IUp In 7 U* To 3 Channel Equipment

KIT FEATURES: Strong Injection Molded Cowl Flying Check lis t and Piloting Tips Handy Printed Fuselage Sides; Build Internal Structure Directly on the Wood Instructions lor Installing Radio Equipment Complete Illustrated Instructions Nylon Nose Gear Bearing Nylon Control Horns Molded Surface Hinges Heavy Duty Steering Arm Die-Cut Balsa and Plywood Parts LENGTH: 42" WEIGHT: 4 Lbs. Top Quality Balsa and Hardwood WINGSPAN: 57" ENGINES: .19- 40 Full-Size Plans Formed Nose Gear with Shock-Absorbing Coil Ailerons are not supplied in Kadet Mark I, but a conversion Torsion Bar Main Gear kit RP-AK-331 for addition of ailerons is available for $3.85.

See your dealer first! To order direct, add $1 postage under $10. Postage free over $10. No C.O.D. Send $2 for the latest catalog of kits, accessories and supplies by SIG and other major companies. Sig Manufacturing Co. . . Montezuma, la 50171 5 /rom When USPJA judge John Targosand his fam ily went to Europeon vacation last summer, they a ; / / visited the office of MODELAR magazine in Czechoslovakia, and met its Editor, Vladimir Hadac (center). Assistant Editor Tomas Sládek Irt), and the Editor of the Czech full-scale maga­ N o r t h r o p ' * zine LETECTVÍ + KOSMONAUTICA, Otakar Saffek (far left). We have corresponded with Vladimir in the past, and w ill soon be presenting a construction article from MODELAR for a w o r k b e n c h beautiful 1/5-scale Blanik sailplane with alternate power pod. Hello from the USA!!

• For the first time in its history, the the so-called misguided efforts of a few mid-December 1980, Astro Flight has AMA is faced with a toss-up in its people. moved to a new facility at 13311 Beach presidential election, primarily brought We wish the 1981-82 president a Ave., Venice, CA 90291. The phone on by a strong write-in vote. Without successful term in office, and a rapport number remains the same, (213) having the proper statistics in front of us, with his other Executive Council mem­ 821-6242. we can’t state positively, but this could bers that will be fruitful and beneficial to ★ ★ ★ also be the first election in which the all AMA members. Rosie’s R/C Products has also made an existing president’s namedid not appear TRADE SHOW UPDATE address change, to 972 Begonia Ave., on the ballot, the first time that a 51% Word has just come to us by co­ Costa Mesa, CA 92626, while maintain­ majority was not acquired by any one director Chuck Holden, that the tenta­ ing the same business phone, (714) candidate on the first round of voting, tive date for the Dallas-based Southwest 557-1453. and the first time that a write-in candi­ Modeler Show we published last month, ★ ★ ★ date ever accumulated more than a has been changed. Instead of March 14 John Gorham, of Gorham Model token quantity of votes. and 15, it will be May 16 and 17. This Products, observes that between heli­ Of course, we’re talking about the show, which has been plagued with bad copter kit production and replacement singular accomplishments of Earl Witt, weather, last-minute schedule foul-ups service, his company consumes an AMA's no-nonsense president for the beyond its control, and last year, a hot average of one mile of rotor blade stock past two years. In like manner, but with weekend in june with a crapped-out air per month! even a higher ratio of write-in votes, conditioning system, deserves better ★ ★ ★ Horrace Cain, of District VI, came out on luck. With a change of location to This news will help the Quarter top of his two official com petitors, facilities at the Inn of the America’s Midget Pylon engine situation. Current­ Bryant Thompson and Rick Gerling, Holiday Inn-North, instead of the fair­ ly, there is much discussion concerning forcing a runoff vote for vice president grounds used for the past three years, the serious shortage of competitive .15 in that district. erhaps that luck will improve. We sure R/C engines, with many in favor of By the time this appears, the runoff ope so. incorporating the more abundant 3.5cc elections for president and District VI Anyone interested can obtain further (.21 cu. in.) units (turned down by R/C vice president will have been com­ information from Chuck Holden at (214) Contest Board). pleted. The actual announcement may 742-2001, Ext. 230, or Mike Clark, (214) Now comes news that Henry Nelson, be in a dead heat with the publishing of 948-2108. Nelson Competition Engines, will soon this issue, but the results will put either ★ ★ ★ be marketing a .15/.15 R/C that is John Crigg or Earl Witt in as president of The Westerville (Ohio) Model Aero­ claimed to be able to blow the fins off AMA for the next two years, and Horrace nautics Association, Inc. is sponsoring its any .15 engine made to date. To be Cain or Bryant Thompson will represent 11th annual R/C Show on March 21, distributed by Kustom Kraftsmanship District VI on the Executive Council, as a 1981, from 0900 to 1600 hours. The (Joe Klause), P.O. Box 2699, Laguna Hills, vice president. No matter what the location is an 11,000 sq. ft. facility at 3850 CA 92653, and available by June 1,1981 outcome in either race, this election Stelzer Rd., Columbus, Ohio, near the (availability of quantities suitable to proves beyond any doubt that the voting Morse Rd. Exit of the I-270 Columbus meet AMA requirements for legality, membership can no longer be hood­ outerbelt. Displays will include most will not occur until too late for them to winked into buying whatever is placed everything in the hobby field, and a be used at the 1981 Nats), the prices will in front of them, disguised in fancy giant-size swap shop is featured. For be $159.95 standard, and $169.95 R/C. wrapping. The controversies of recent more information, contact Rich Ritchi- Some general information follows. years have brought out the largest vote son, 1834 E. Beaumont Rd., Columbus, Any further info concerning specs, ever tallied (28.7% of the eligible voters, OH 43224. delivery, dealer inquiries, etc., can be or 19,163 in number), tangible evidence INDUSTRY NOTES that the unrest has not been caused by Bob Boucher announces that as of Continued on page 103

6 R/C MODEL BUILDER John Townstey. San Francisco. California v Boeing 247D Alastair Johnstone. Portland. Oregon « ι · · THčee*byAte Kmner Envoy Elbert Weathers. San Diego. California (Letters to the Editor) Northrop Gamma Kenneth Hamilton. Los Angeles. California Dear Bill yellow and blue were also available The Grand Prize Winners. Class B: The two pan article. "The Jimmie Allen Richfield yellow in particular would have been Curliss-Wrighl "Baby Bunting Story, appearing in your November and very difficult tor most modelers lo mix from Lens Murakami Los Angeles. California December issues ol RCMB brought back standard colors Class C: some memories as well as having mlormed me I bought my kit ot wood and dopes trom Peg There was no Grand Prize m this class ol aspects ol the Jimmie Alien activities new to and Barney Snyder who at that time had their Trophies were awarded at division contests me I en/oyed the article, as I do every issue ol small Modelcrall" shop on 54th Street in Los only your entire magazine A ngeles. at approximately 4th A venue I worked Bill, this got rather long, but I thought it might In 1935 I was attending an aircrall design constantly on the model Northrop Gamma of be ol some interest to you I still have the class, and was active in building scale model 24 span, to meet the July 15 deadline Jimmie Allen contest tolder containing the very aircrall The long school summer vacation Alter carving and sanding the external lines good quality 3-views sections, and a photo ot stretched betore me ol the model. I hollowed the fuselage mounted the prototype airplane ol each contest type The Richtield Oil Company ot California, the right-hand hall on the wing installed a Also a copy ol Richfield’s magazine tor their through their Jimmie Allen Flying Club, an­ cockpit intenoi and lull working controls (Haps dealers. "The Firing Line " lor Autumn 1935. in nounced a Non-Flying Scale Model Airplane ailerons, rudder, elevator, trailing antenna reel), which the contest is covered and a couple ol Building Contest" open to all members ol the then added the tuselage tell side and a sliding very yellowed L A Times clippings with photos Club except professional model makers, the canopy which permitted access to the controls I have my own size 116 black-and-white snap­ contest to start June 1 and end July 15. the when open The model was hmshed in the shots ot my completed model from various completed models having to be turned m tor yellow (actually closer to a cream colori with angles, and somewhere ti have seen ii recently) ludgmg by the latter dale blue striping set oft with the Richtield Eagle I have the studio shot given me bv Richfield, but Models had to be ot types specified, to the emblem, and the Northrop Corporation circle turning the place upside down has been to no exact size shown on plans provided, and were logo on the lin Oh yes. there were extendable avail11 also still have the check vouchers trom required to be hmshed in the special Richfield landing lights on the underside ol the wing, loo the Northrop Corporation tor the local and blue and yellow colors I had attached a small note to my model Grand Prizes There were three classes ol competition calling attention to the tael that the controls While on this nostalgia kick. I will mention Class A Open to all ages. Transport and were movable from the cockpit At the May Co having a number ol mementos ol the '33 commercial models Douglas DC-2. Boeing fudging. Dudley Steele. Richfield's Chiel ol Stall National A u Races at Mines Field, the program, 247D. Northrop Gamma 2-D Mailplane. Stinson and a pilot, discovered the note, tried the my Gold Pass tor a box seat the lour days, Reliant. Kmner Envoy Any materials desired controls (poking in through the open canopy various Air Race and LA Times falters, the could be used with the eraser tip of a pencil, his finger was too model contest folder with plans ol Laird Class B 13 years and under. Sport plane large), tell in love with iheir positive response, Solution. Howard and Gee Bee No 11 racers, model: Curhss-Wnght "Baby Bunting." to be played with them, insisted on every other fudge also the required pylon to which the model was made ot wood coming over and watching There is hille doubt to be mounted My Gee Bee won Senior 1st. Class C 8 years and under, a model ot any in my mind that these controls and Steele's and il still hangs on my den wall The pylon material and any size not exceeding 12" span, enthusiasm tor them were the deciding factors disappeared somewhere years ago of any ot the above, or of any American airplane m my model winning the Grand Prize in the Very best regards. in production as of January 1. 1935 Northrop category The controls were all push- Ken Hamilton At my Dad's urging. I entered the contest, pull rod and bellcrank. with torque tubes out Rancho Palos Verdes. California electing to build the Northrop Gamma 2-D through the wing to the ailerons. Free play was Thanks for your very interesting letter. Mailplane thus minimized One other Northrop entered Ken. After reading Walter House's article The contest involved the entire West Coast, also had cockpit controls, but these worked and your letter, one begins to wonder models first being fudged in local communities, through threads over pulleys The threads had whatever happened to all of that mass then being forwarded to semi-final /udgmgs stretched, and tittle action resulted at the enthusiasm for sponsoring youth activities held in Seattle. Portland. San Francisco and Los surfaces when the controls were moved in modeling, that existed during those pre- Angeles Winners here went to a single final Paul Buckner of Norlhrop s Inspection Dept World War II years Are the potential spon­ fudging held in Los Angeles, where the final (if I recall correctly) was the fudge repre­ sors turned off? Are the modelers turned Grand Prize winners in each Class and lor each senting Northrop off? Where are the spark plugs who put the type were determined I still have a letter signed by John Northrop whole act together? One sign of the times The contest was a ma/or event Local congratulating me. and inviting me lo attend the . . . back then. Plymouth (Chrysler) spon­ merchants supported it, giving merchandise Nortarop factory for a tour and to meet him The sored huge national model competitions. awards to local winners. Cash prizes were factory was then at approximately Imperial Now we. through government loans, are given at the four semi-final /udgings. and at the Highway and Lapham Street in El Segundo. sponsoring Chrysler! hnal Grand Prize fudging Richtield reserved the Somehow I never got there Many years later I In a future article, we'll present one of right to purchase the final Grand Prize winners, finally met Mr Northrop at an aircrall historical Ken's fine models from an early issue of and in la d exercised that option, paying tor the meeting, told him ot this, and that I had ended Flying Aces, as the Old Timer Model of the models. A professional photo ol each model up working for North American Aviation across Month. was sent to its builder along with the check. The the street from him, under Dutch Kmdelberger models were displayed in the elevator lobby of He smiled and said I had picked a pretty good Dear Sirs. the Black and Gold Richtield Building in outfit there too. Incidentally, one ot your columnists recently downtown Los Angeles (the building is now Stories on the contest appeared in the L A. wrote on the subject ot covering silk on tissue gone, replaced by the Arco Towers) Times, with pictures ot the winners and their and the problems created I can fall him the The cash prizes lor each of the aircraft types models. easy way noted were donated by the manufacturers ot Winners in this contest, which received such 1. Cover with tissue in the usual way. and the real aircraft. In Los Angeles, fudging was enthusiastic sponsorship and such a great give two coats ol thinned dope (50/50/ conducted at the May Company, and the Grand turnout of models, are listed below. I wonder 2 Cut silk to shape (I used lightweight Esaki Prize winners were announced at the Los how many went on to become involved with ironed to remove crease marks), lay in place Angeles Times building in their auditorium. aircraft as I did. and how many continued with and apply cellulose ihmners (nol dope) liberally Model airplane hobby shops supported the their model interest, and are today perhaps working from the center outwards to avoid contest by providing kits for each type. These readers ot RCMB? bubbles. were no "shake the box" prefab type kits, but 3. When dry. dope in the usual way. but were simply an assist to the modeler by Grand Prize Winners, Class A: remember, at stage 2. use LOTS ol thinner providing him with blocks and planks of fine Douglas DC-2: I have successfully and easily covered an Air quality balsa cut to proper overall dimensions. John McGinnis. Los Angeles. California Nitrate dopes in the proper shades ol Richfield Stinson Reliant: Continued on page 98

MARCH 1981 7 OVER THE COUNTER

A ll material published in "Over the Counter" is quoted or paraphrased from press releases furnished by the manufacturers and/or their advertising agencies, unless otherwise speci­ fied. The review and/or description of any product by R/CMB does not constitute an endorsement of that product, nor any assur­ ance as to its safety or performance by R/CMB.______• One of the best R/C trainers around. Sig’s "Kadet." has just been updated into a Mark II version for quicker building and even better flying qualities . . . if such a thing is possible. Looking at pics of the old and new Kadets, the only external changes we can detect are a larger vertical stab (looks the same as the Sig's latest is the Kadet Mark It, an improved version of the popular Sig trainer. one on the smaller Kadet jr.) and a bent aluminum main gear in place of the original wire gear. It does go deeper mended engine size is .25 to .40. Al­ charger, switch harness, servo trays, and than that, however. The new airplane is though designed primarily for four- all other related hardware. slightly larger all around and has about channel flying (i.e.. with ailerons), the Some of the features are: 30 square inches more wing area than new Kadet will perform very well on just • Transmitter: the Mark I version, most of it coming three channels (rudder/elevator/throt- Metal construction with plastic mid­ from the wider ailerons, which, inci­ tle), for novices who presently own section; 10.8-volt ni-cd battery pack; dentally. are fitted with differential three-channel systems. Suggested retail closed-face open gimbal sticks; con­ control horns for more up travel than price is $49.95, same as the old Mark I venient carrying handle. down .. . makes for smoother turns. Kadet. • Receiver: Construction has been altered some­ From Sig Mfg. Co., Montezuma, IA Measures 2.5 x 1.6 x .8 inches: weighs what to reduce the overall number of 50171. just two ounces; has a strong glass-filled parts, but the finished model is claimed ★ ★ ★ nylon case. to be stronger than ever. Beginners In the market for a new R/C system, • Servos: should have no trouble getting this one one that is moderately priced and built Measures 1.5 x .75 x 1.6 inches; weighs put together, as the kit includes a big 36- by a reputable firm? If so. Tower Flob- 1.8 ounces; produces 30 ounce-inches page instruction manual with over 150 bies may have what you’re looking for in of torque; has 23 splines on the output photos and illustrations. Full hardware is its new "System 4” four and six-channel supplied, including machined alumi­ rigs, made in Japan by . . . but on second num motor mounts, and an injection- thought, we’ll let you figure it out for molded plastic cowling. yourself. (Flint: the servos, especially the Specs on the Mark II Kadet are: wing servo wheels, are a dead giveaway.) At span, 57-1/4 inches; wing area, 635 any rate, both systems include transmit­ square inches; length, 44-1/4 inches; ter, receiver, four servos (three normal and average weight 5 pounds. Recom­ and one reverse), ni-cds all around,

New radio systems from Tower Hobbies, the "System 4.” Four and Six-channel versions Goldberg's expanded hinge slotting kit and available. new large size (2 oz.) Super Jet.

8 R/C MODEL BUILDER Ο ο ο ο ο ο

The six-bolt prop adaptor, new from Roush Manufacturing. Roush Manufacturing is also handing the mighty Kioritz 2.42 cu. in. engine for Giant Scale models. shaft for accurate positioning of the six­ different types of miniature lighting explains all of these systems in much armed servo wheels. systems (flashing aircraft nav lights, a greater detail than we have room for • Airborne ni-cd: rotating beacon, landing lights, a strobe, here. If interested, send an S.A.S.E. and Weighs four ounces; has 500 MAh and marine navigation lights), all pow­ ask for the fact sheet on "The Red Line” capacity; measures 1.25 x 1.25 x 2.25 ered by common nine-volt transistor electronic products. Write to RAM, 3631 inches. radio type batteries. Running time varies N. Kedvale Ave., Chicago, IL 60641. Introductory prices on the "System 4” with the number and type of bulbs. All ★ ★ ★ radios are a very reasonable $149.95 for systems are completely assembled and Active builders who lean toward the the four-channel and $169.95 for the six. ready to go; the only extra item you’ll use of the thick gap-filling cyanoacry­ Both are covered by a full one-year need is a battery. RAM suggests using lates will be happy to learn that Carl warranty, and all repairs and service alkaline cells for best performance. Goldberg Models has just introduced a work will be done at Tower’s Cham­ Also included in this product line area larger size of its very popular Super Jet paign, Illinois office. Mini and Maxi Electronic Throttle, for adhesive . . . a big two-ounce bottle, Looks and sounds good to us. If you controlling motor speed in all types of which at $12.95 represents better than a feel the same, you can order or get more electric-powered models, and an Elec­ 1/3 saving for you the consumer. information from Tower Hobbies, P.O. tronic Switcher, which is used to control Goldberg also has an expanded ver­ Box 778, Champaign, IL 61820, or call various circuits such as lights, auxiliary sion of its one-of-a-kind hinge slotting (800) 637-6050, (800) 637-8700, or (800) glow plug battery, or auxiliary electric kit; now included are two centering 252-1113. Illinois residents call (217) motors. These three units work off of guides, which provide for perfectly 398-3636. your airborne receiver batteries and aligned hinges in your flying surfaces. It ★ ★ ★ plug directly into your receiver, bypass­ works with both sizes of Klett regular RAM (RAdio Controlled Models) has ing the need for an extra servo. Like the hinges and also with the newer flex added "The Red Line" of electronic lighting systems just described, these points. The seven-piece set goes for only marvels to its popular series of sport R/C come fully assembled, but without $2.95. boats and related accessories. The “ red” connectors for the receiver; you’ll have Both from Carl Goldberg Models, in "Red Line” stands for RAM Electronic to supply and wire them up yourself. 4734 W. Chicago Ave., Chicago, IL 60651. Devices, which presently includes five RAM has a poop sheet available that ★ ★ ★

The familiar Fox .45 B.B., fitted with the new Davis Diesel conver- Big 67-inch steam trawler, offered in fiberglass hull form by Dynamic sion head. Models.

MARCH 1981 9 involved in the Giant Scale movement to be about the most powerful ready-to- use model engine presently available (3.2 horsepower at 8,000 rpm), and therefore the engine of choice for the biggest of the biggies or heaviest of the heavies, or on large aerobatic types when no other motor gives the desired performance. Here are some of the engine's more noteworthy features, as quoted from the press release: The engine uses a three-ring piston running in a chrome bore for outstand­ ing compression and long life. The crank and rod are of chrome-moly steel, with caged roller bearings on the rod ends Leisure Electronics' improved epoxyglass chassis and new electric motor for 1/12-scale R/C cars. and massive ball bearings on both ends o f the crank. The carburetor is the Walbro type and is set up so it can be Leisure Electronics’ Roland Boucher PanaVise clamps should be available by turned 180° from its original position for favored us with samples of his com­ the time this issue hits the stands. If not, ease of throttle hookup. The weight of pany’s new Team Leisure electric R/C you can order direct from PanaVise the Kioritz is 6.5 lbs. Points are sealed in car motor and improved epoxyglass Products, 2850 E. 29th St., Long Beach, the rear casting, free from oil and dirt. chassis. The motor (No. 1002-D) is the CA 90806. Probably the Kioritz’s best feature is same as Leisure’s No. 1002 05 stock ★ ★ ★ the full one-year warranty against de­ motor, but is dynomometer tested and The chainsaw-type engine occupying fects in material and workmanship. broken in at the factory, assuring you of the entire nose of the Byron Pitts in one Warranty or service work can be done top performance right out of the pack­ of the photos is the Kioritz 2.42 cubic by Roush Mfg. or by your nearest Echo- age. The new motor is certified ROAR- inch powerplant, converted to aircraft Kioritz dealer (take the engine into his legal for Stock racing events and sells for use and marketed by Tom and Dick shop with the fuselage still attached and $15. Roush, who together are the driving watch his jaw drop!). Price is $189.95. The epoxyglass chassis has been im­ forces behind Roush Manufacturing, Also being offered by Roush Mfg. is a proved by the addition of two elongated located out in Sandyville, Ohio. The six-bolt prop adaptor for the popular holes down the middle (see photo). The Kioritz is generally considered by those Quadra engine, or any other motor with holes are there to provide more flexi­ a 5/16-24 threaded shaft. Both the bility and “ give” without sacrificing adaptor and front bolt plate are ma­ strength, plus they make the piece a bit chined with alignment studs in the lighter, too. Part number (2001) and center, and the bolt plate also doubles as price ($13) remain the same. a drill jig for the prop. The bolt plate is From Leisure Electronics, 11 Deer­ tapped for a spinner screw (didn’t say spring, Irvine, CA 92714. what thread size), so special adaptors are ★ ★ ★ unnecessary. Included in the $19.95 Latest item in PanaVise’s line of high- price tag are the prop adaptor, bolt quality tools for craftsmen and hobbyists plate, and six socket-head bolts and is the unique Dual 90° Corner Clamps, washers. designed to hold workpieces at exact From Roush Manufacturing, P.O. Box 90° angles for gluing or machining. The 251, Sandyville, OH 44671. clamp body itself is of cast aluminum, ★ ★ ★ while the actual clamping is done by two Head honcho of Davis Diesel Devel­ socket-head machine screws, which are opment, Bob Davis, is expanding his line fitted with removable vinyl plastic caps of diesel conversions by offering a diesel to protect your work from dings and head for the Fox .45 B.B. Bob sez the scratches. With the plastic caps removed converted Fox will swing a 12x6 prop at the clamps will hold pieces up to 3/4 of better than 12,000 rpm and a 14x4 at over an inch thick. Handy Dual 90° Corner Clamps from 9,000 rpm, with a reliable idle at 2,000 PanaVise. Packaged two to a card, the new Con tinued on page 99

High-performance racing venturi for the K&B 3.5 and 7.5, by R/C Unusual but effective muffler for the K&B 3.5, by Bill Evans R/C B. Products. A irc ra ft.

10 R/C MODEL BUILDER Wotta project! Certainly one of the most ambitious undertakings we've ever seen, is Don Allen's Lockheed SR-71, shown here ready for balsa planking. Total length is eight feet, power w ill be two K&B 7.5 ducted fans . . . more details in text. Photo by Frank Broach.

Lastly, Santa, I hinted that I needed a new radio outfit because the one I have now keeps glitching and causes me a lot of trouble. I can’t see that your gift will be of any value at all. Three pounds of medicated powder, according to the manufacturer, may solve an ” itch" but it won’t do a darn thing for a "glitch." By BOB UNDERWOOD Well, I guess that's about all, Santa. I really hate to send you a letter like this 1 TO 1 SCALE leak through. but I feel you really have to know about • Christmas is over, and while every­ One whale of a problem developed these problems. Maybe you should thing went just fine last year, some when the owner of my apartment build­ computerize to help with accuracy and modelers seem to have experienced ing discovered I was keeping a horse in speed. I understand they can be very some delivery problems concerning our my bedroom. I guess you didn't remem­ helpful when working with model activ­ red-suited friend from the North Pole. I ber back to World War II times, or ities, especially contests. received a letter, from our old friend maybe I should have put a "P-51" in Sincerely, Herman Schlunk, that was directed to front of the word “ Mustang" on the list. Herman Schlunk Mr. Claus. We felt that your knowing of I was wondering, if I can’t get rid of the STUFF AND THINGS these problems might help you plan horse is there any chance that you could We’ve included a couple of photos more carefully for next year. get a few bales of hay to me? I’m going this month concerning a project being December 26, 1980 broke trying to feed the horse shredded developed by Don Allen, of St. Louis. Dear Santa, wheat. While Don has not consistently hit the Cosh, it looks like we hada communi­ In regard to the third item, I really contest trail, he has created some excel­ cation problem again this year. While have to hand it to you for originality and lently done projects over the last several the gifts that you brought were really ingenuity. The micro-balloons you sent years. His German ME-163 Komet (rocket very nice, I think I might have a little are fantastic! Under the microscope I plane) is a fine flying model and is trouble using someof them. For instance, could see each one of those little jobbies beautifully built. He is working hard to the one item listed as a tuned pipe had a and how you ever got your picture on sharpen his flying skills and is continuing specific use. I don’t think what you left each one I’ll never know. But what was to seek out challenging subjects. Don’s me will work too well, since a flute has really marvelous was the little 1/8-inch- latest is an SR-71 twin ducted fan model. just too many holes for the exhaust to high elf you sent along to blow them up. Continued on page 86

A t left is Canada's Jim Crawford, with what appears to be (and this is only a guess) a 1/3-scale Baby Ace. Fellow on the right is Bill Hunt, Naples, Florida, with scratch-built Miles Sparrowhawk. Both photos by Don Prentice, at the 1980 Flying Dutchmen Scale Rally, Ontario, Canada.

MARCH 1981 11 Yes, it do fly! The monstrous (yet only 1/20 scale) Hughes flying boat "Spruce Goose", built by Darrell and Merle Meyer, Orange, California, piloted by John Elliot (flight controls) and Darrell Meyer (engine controls), completed a takeoff, one gentle 'S' turn, and a landing at Prado Park, south of Chino, California, on Nov.29, 1980. Flight was highly satisfactory. Takeoff weight was 83 pounds for the 16-ft. span model.

by BILL NORTHROP EWORLD SPRUCE GOOSE PHOTOS BY GRETA ELLIOT • The initial voting on R/C rules pro­ competitive .15 cu. in. engines for this posals for the 1982-83 com petition event, the Rossi and Cox Conquest, have period has been tabulated, with some become endangered species. On the interesting results (at least for those who other hand, R/C auto and boat racing care something about competition). has hatched quite a number of potent, In R/C Pylon, Formula 1 goes into still and very available engines in the .21 cu. another two years without any changes. in. class. Strangely enough, one board On the one hand, this would indicate member voted ‘yes’ on one of the that the rules are quite satisfactory to all proposals, and ‘no’ on the other, but concerned. On the other hand, it could both proposals went down the tubes. mean that dying interest in the event Personally, we think the idea should results in a "who cares" attitude toward have been kept open for further con­ making any improvements or changes. sideration. Quarter Midget Pylon had two similar Incidentally, the new Nelson .15, to proposals to allow engines up to 3.5cc come out in mid-1981, could still solve (.21 cu. in.) displacement. Reasoning the problem. See "Workbench” for was quite logical . .. the only two really more information.

Bolt-on reduction gear base for .61 or .90 engines, by Leo O'Reilly, Keswick, Australia. Reduction is 1 to 1.7. We have his fu ll address.

"Big John" Elliot, holding the left wingtip, does very little to shrink the size of the huge flying New 4-stroke .35 coming from Enya. We boat during assembly. Darrell Meyer guides the wing into place. Eight K&B .61 pumpers. don’t know when it is to be available in US.

12 R/C MODEL BUILDER Merle Meyer watches as John Elliot signals "throttle down" to Darrell Meyer at the engine con­ Rear view of O'Reilly reduction gear base, sole. Dave New holds the tac. Special transmitter splits throttles into four individual pairs. also shows new Enya .60X pump.

Two more new Enya R/C engines are on the way. At left, the .21X, At left, the YS 120, as used by I. Matsui in his T.O.C. Laser. At and right, the .11CX. Both shown to us by Leo O'Reilly. right, another view of the new Enya 60X.

A proposal to allow fiberglass props in Two more pylon categories were passed the initial vote unanimously. Q.M. Pylon was also defeated in the proposed. One, to revise the dead Sport We're kinda sorry to see 500 racing initial vote. Pylon by including Formula 500, was (Quickie 500, Formula 500, or whatever) Half-A Pylon, which has had many passed by the board. The second, a heading toward nationalization. Al­ roposals in the last two voting periods, category for Reno Warbirds (hopped up though standardizing rules is good in ad only one proposal this time . . . to WW-II prop-driven fighters) racing, was most respects, it seems that in racing, it allow pressurized fuel systems. It passed diverted to the Scale Board. Word from Continued on page 91 9-2. Chairman Claude McCullough is that it

These photos arrived too late to use with our construction article in last month's issue on Roger Stern's 3-1/4" scale Liberty Sport. Photos show Roger (in appropriate T-shirt!) holding the ship, for size reference, and then two shots of it in the air. Even at 5,000 feet, it's very spry!

MARCH 1981 13 PHOTOS BY AUTHOR

Ain't that just the purtiest thing you ever saw? It's Paul Sims' nine-foot Champ, just starting to climb up on the step for takeoff. Normally "Herman," Paul's pilot, would be on board, but on these first flights on water, he chickened out! (Said he couldn't swim.I

GΛ I Λ A Ä NA ^ T A s c a FLIGHT l e LINE By LEE TAYLOR

GIANT SCALE FLIGHT-LINE Paul Sims got a set of Sid Morgan float wheel and float "hardpoints” built into • On Tuesday, October 28, 1980, two plans from me and proceeded to build the fuselage, and removing/installing a friends and I had an absolute BLAST! two sets of floats, one for his Nosen few pins converts his plane back and Two years ago, several giant modelers Champ and one for mine. Ken forth between the two. His water in my area became interested in the Runestrand got a Balsa USA 45-inch float rudder is steered by a servo mounted in possibility of flying our big birds on kit and built himself a set for his original a waterproof box in the float, and is floats. The impetus for this ridiculous L-4 Cub. Both of these guys are expert, interconnected to the air rudder servo thought, at a time when most guys had highly innovative modelers with exten­ via a "T” harness. The servo lead plugs yet to even fly a giant successfully on sive float-flying experience, so it was not into a mating plug mounted flush to the wheels, came from the "Lakeport Rene­ so much "will it work?” but rather. fuselage belly. gades," three men who fly seaplanes "What’s a super-neat solution to this Ken got busy about two weeks before extensively because they live right on problem?” Things such as absolutely the due-date, and in his characteristic the shore of Clear Lake, California. rigid float mounts,sub-finsforadditional manner whipped out his very nice effort What's worse, they were doing it with a yaw stability, and water-rudder steering almost overnight. His floats use a heavy Quadra-powered Cub, and having a were tackled. All of the requirements wire mount cage that slips into cross­ total blast doing so! The idea of joining were well known from our previous fuselage slots, and are held in with metal in on that kind of fun had us absolutely experience, but adapting them to the straps ala pattern ship fixed wire landing drooling. bigger models took some thinking. gears. Ken opted initially to just put fixed As usual, other projects kept inter­ Anyway, true to form and history. Paul stabilizing fins on his floats and depend fering, and the idea just simmered on a took all summer to build two absolutely on the air rudder for steering. back burner, too durned intriguing to immaculate pairs of floats, then engi­ Both Ken and Paul used a sub-fin allow ourselves to think about it too neered a mounting system with mounted to a plate that easily screws much. This summer, though, the itch machined metal struts that duplicates onto the belly under the tail. Remove was just too much to avoid scratching. full-scale practice. His plane has both three screws to take off the sub-fin, and you're back to a landplane configura­ tion. As I said, history repeated itself. Paul worked slowly but steadily all summer, Ken blasted through in two weeks, and how’d I do? Mine are still unmounted. Typical. Disgusting! Anyway, to make a long story short (forget it, Taylor, it’s already too late!), Tuesday, October 28 arrived with both Ken and Paul ready to go, and me the poor orphan tagging along with only a camera. We loaded up and headed out to nearby Folsom Lake. The day was absolutely perfect, no wind, a highly unusual glass-smooth lake, a hard sand beach on an Indian-Summer day after the summer’s crowds had left. It seemed there were only the three of us on the After the flight, Herman did at least agree to pose on the plane. Floats were built from Sid whole lake. Morgan plans, uses a steerable water rudder on the right float only. Paul was the first to get ready to go,

14 R/C MODEL BUILDER Ken Runestranďs Piper L-4 and Paul Sims' Aeronca Champ, resting peacefully after a fun-filled day of flying. Note the auxiliary sub-fins, added to compensate for the lateral area of the floats. You guys who live near a lake and haven't tried seaplanes are really missing the fun.

but soon discovered an engine that needed a little tweaking. Back to shore and off with the cowl. Ken set his bird in the water, grabbed his transmitter and pullcord starter (he uses a pulley machined onto the prop driver made by Dynathrust . . . very effective), then tried to figure out how to hold the transmitter, hold the plane, and pull on the starter. "Hmm, put the transmitter on top of the plane, then hold and pull." “ KEN, YOU #$%«&#, that plane's sitting in the WATER!!" I could envision the transmitter going glug- glug-gurgle! Paul ran over and helped out. With the engine started and controls TAKEOFF RUN! Note full up elevator, used during the first part of the run and during all checked out, the L-4 was released taxiing maneuvers. Text lists sources of float plans and kits. roughly parallel to shore, Ken intending to turn outward using the air rudder the Cub leaped off the water like a cat. is just more positive. Glide is still un­ (remember no water rudder on his yet). Certainly no doubt about the flyability believably flat, and penetration is better “ Hmm, them sub-fins sure do their job, of this bird, the takeoff run from with the additional weight. they keep the plane going straight NO throttle-forward to leap-off was only After feeling out the bird and making MATTER W HAT!" A hundred yards about 20 yards. several low passes for the camera. Ken further and the plane gently beached In the air, the L-4 proved to handle started to wring the bird out. Now. you itself. even better than it did without floats. have to understand that the Quadra is With the plane retrieved and aimed in The additional weight makes it a more not exactly scale power for what is the proper direction, Ken advanced the solid-feeling plane, with a slightly higher supposed to be a 65-hp Piper Cub. It is throttle. The plane jumped up on step approach speed and more positive rate much more like how the 150-hp Super just as pretty as a picture, then started to of descent to a landing. On wheels, this Cub, lightly loaded, with an expert pilot go over slightly too far onto the front of 17-lb. plane is somewhat light and on board would perform. Ken has never the floats. A quick little jerk of up and "floaty.” On floats at 21 lbs., everything Continued on page 89

Ken Runestrand built his L-4 from a Balsa USA J-3 kit, making several structural mods in the process. He opted to do away w ith a steerable water rudder, a decision he regretted later when he found the model totally unresponsive to the air rudder while on the water.

MARCH 1981 15 PHOTOS BY DAVE LATSHA

Oave Latsha (left) and Tom Christopher with Dave's No. 1 best finish Overall 3rd placer, Dave Shadel (left), just about to set the new award Polecat at the 1980 NMPRA Form 1 Champs. Tom was official F-1 fast time record of 1:09.00. Samurai Racing Team numero uno in the Championship Race. member, Jim Shinohara, doing the holding. PYLON * GO FAST and By JIM GAGER Turn Left/ the Tico Airport. Pylon placement was 4:00 p.m. Sunday afternoon, after excellent in either direction, depending Mother Nature had pulled her bag of upon the setup for the wind. Pit condi­ tricks and the gods of dumb thumbs and tions were equally as fine, located on an other usual wondrous problems were adjacent concrete taxi strip, with a grass pulled on the Form I pilots and their pit pit area just off to one side. Arriving at crews, leaving the victorious and others Titusville and seeing this for the first time with the Floridian warm feeling of was enough to turn any pylon racer on having had another super Champion­ 1980 NMPRA FORMULA 1 and want to get out the equipment and ship race. Tom Christopher came out CHAMPIONSHIPS "get it on," which is exactly what top dog, No. 1 with a perfect score for Due to a fire at my place of employ­ happened. Test flights were made until ten rounds. Greg Doe was 2nd, Dave ment just a week prior to the champion­ darkness set in. Shadel 3rd, John McDermott 4th, and ships, I was unable to attend. A last- Friday, most everyone from the north, Brian Richmond 5th. Dave Shadel also minute call to my good buddy Dave south, east and west . . . 45 fliers, to be shared Tom Christopher's "high as a Latsha, to request he take some pictures exact . . . showed up very early at the kite” feelings, because during the con­ and some notes so we could have some flying site and proceeded to hone their test he turned in the new official results for this column, resulted in an beautiful screaming banshees in hopes Formula I fast time record of 1:09 flat. extensive and excellent report by Dave. of becoming the Number One man for Dave Latsha was still soaring in the With that .. . here's Dave! the year. With all their wishful thinking, clouds because he copped the Form I How good a Formula I Championship this was not to be known until about static best finish award. (Ask Dave how race will be somewhat depends on Mother Nature and the gods that travel around with the Form I racers. Regard­ less of that, 1980’s Formula I Champion­ ship pylon race was held at Titusville, Florida, hosted by the Moonport Modelers of Titusville. The C.D., Roy Joehanson, and his crew were all well prepared for whatever was to take place during the two days of racing. Rod and Sali Gier were the contest coordinators. Rod was also the official starter for two days. From theForml pilotsandallother people interested in Form I, many thanks to these people, for a job well done. The flying site location and field Jim Shinohara doing a leap-frog number after Dave Shadel’s fast-time winner. In contrast, note conditions were the finest, located on Bruce Richmond's form . .. the perfect launch!

16 R/C MODEL BUILDER Bruce Richmond holding for Greg Doe. When the dust cleared after Behind Jim Shinohara is the wagon tram, provided by the contest tw o days of all-out racing. Greg was in 2nd place overall. management. Saved many an aching muscle for everyone.

for the Championship race. Rod and Sali tram had visions of being at Indianapolis, Gier registered the fliers and at this leaving no room for you to not be point deserve a vote of thanks; they prepared. When his pit boss said, “ Go,” stayed up until the wee hours of the he went. Many a pit crew man was seen morning, like 4:00 a.m., to prepare the playing airplane, screaming like a Form I matrix, and were back out on the flight engine, trying to catch up to the wagon line at 7:00 a.m. for the race to start at tram, if he was not on it when it left. 8:30 a.m. Rod was the official starter, and Most of them caught it, due to the Sali the scorekeeper. Early Saturday driver’s erratic brakes and the flier’s morning, as the rooster crowed, he was high-pitched screams, shouting soon to be drowned out by the throaty "STOP!". Seriously, the tram was a fine roar of the first Form I engine started. feature and saved considerable energy. Then another, and another, until the pits Being a Championship race, the first came alive with screaming engines. And heat started in a fury, and all heats stayed then it happened: the first three heats that way for the following two days of were called and placed in the pit box racing. Many of the pilots constantly grid. turned times in the mid and low teens The starting line area was connected throughout the contest. No room for to the pit grid by a taxiway across an errors, just all-out go. As mentioned in open grass field, with some 600+ feet the beginning, Mother Nature was to Number One high-point man for the past between them, which raised all safety take her part in this event. She decided Form 1 season was Dave Shadel. limits above the normal standards. to leave the temperature and humidity Spectator viewing was excellent, and the conditions ideal, but couldn’t resist to break cranks in both QM and Form I distance was no problem, due to a seeing how the pilots would handle engines.) flatbed wagon tram that picked up the some windy conditions. Now, everyone Friday evening, after the practice pilots and callers at the pit box and knows that Mother Nature has a good session, all of the Form I pilots and their quickly whisked them away to the side and a bad side. The good side was crews (needed for moral support and a starting line, then picked up the last heat nice, warm Florida air, and no rain. And bending of the elbows) checked in at the contestants, picked up the stray planes then the other side that pilots heard Ramada Inn for registration, technical that landed beyond pylon No. 1, then above all the other excitement: inspection, static judging for race take­ returned planes and everyone back to "Gotcha/"Granted, she didn’t do this to off positions, and the best finish award the pit boxes. The driver of this wagon Continued on page 83

Top six finishers, from left: Dave Shadel, 3rd; John McDermott, 4th; Bruce Richmond held and called for his brother Brian. They made a Brian Richmond, 5th; Dave Pearce, 6th;and Greg Doe, 2nd. No. 1 good team, Brian ended up in a creditable 5th place. man, Tom Christopher, in center.

MARCH 1981 17 ktto&eei DORMOY bathtub By HANK ILTZSCH . . . Giant Scale at its very best! This 1/3 exact scale replica of Mike Kimbrel's VW- powered homebuilt captures all of the flavor of the original 1924 machine, and doesn't need a monster chainsaw engine up front to fly in a realistic manner. p h o t o s b y a u t h o r

• At the outset, let it be clear that this is a Like many modelers, those with a bent competition, but then a vast number of model of a replica. The plane that I toward scale in particular. I cannot look scalers don’t enter competition anyway, present here is a model of Mike Kim- at an aircraft or picture thereof without but work for their own inner satisfaction. brel’s replica of the 1924 Dormoy Bath­ envisioning it as a model. There is almost Recognize it? It’s called "scale mad­ tub. Although it may seem strange to an inate sequence of assessments and ness.” and is cured only by frantic model a replica, rather than the original, calculations that run through my mind gathering of information, drawing many there are a number of practical reasons as I look through various books and lines on a piece of paper, then feverishly for this. First, there is the problem of publications. Wing shape and number, slaving over the workbench until the documentation in the event the plane general configuration relative to ease of subject is fait accompli. Unfortunately, it were to be entered into competition. duplication, and moments and propor­ is like the flu. You can get it many times Second, and related to thefirst reason, is tions are considered along with numer­ in your lifetime, or maybe only once, the unavailability and lack of structural ous other trivia. In the event most of the depending on your mental resistance information on the subject to be mod­ above comes out favorably, the subject and stability. eled. The information available on the is mentally filed as a possible. Now that the reasons for building the original 1924 Dormoy Bathtub is a bit Then there are the times, such as model are clear, let’s look into some of sketchy, sufficiently so that most compe­ when I first saw the pictures of Mike’s the background on the original 1924 tition oriented scale builders would shy Tub in the September 1978 issue of Sport Dormoy Bathtub, which obviously gave away from it because of the difficulty in Aviation, when all reason leaves. You are Mike Kimbrel a case of “ full scale” documentation. Oh. there are three- smitten and the plane has to be built, no madness, a closely related affliction. views and a few black-and-white photos question. The subject may or may not be The original aircraft was designed and around, but certainly not the abundance a good subject from the standpoint of built by Etienne Dormoy. This illustrious of material needed (and in most cases required) in today’s competition in Precision or Sport Scale. But since Mike took this sketchy information and converted it into sub­ stance, complete with many available photos and complete sets of construc­ tion drawings, we now have a subject which can be authenticated to the nth degree, while still capturing all of the flavor and character of the original. Make sense? It would seem that with today’s great push into the building of full-scale replicas, we are opening many new vistas for the scale modeler. Of course, it does depend somewhat on how close to authentic-looking the replica is built, as some subjects I have seen lose some­ thing in the translation, but these appear The basically complete fuselage and tail surfaces, ready for covering. Construction is more or to be in the minority. less scale throughout, except for the nose section (for obvious reasons).

18 R/C MODEL BUILDER Frenchman was one of those whose thread of works and genius was woven continuously through aviation history, from before WW-I, on through and beyond WW-II. In chronological order, the following is a listing of his accom­ plishments in, and contributions to, aviation. He began in 1911 as a draftsman for Aeroplanes Deperdussin. He immi­ grated to America in 1913 and worked as a designer for Schmitt Aeroplanes in Paterson, New lersey. After the out­ break of WW-I, he returned to France and enlisted in the flying corps, where he flew Caudron bombers. He returned to the U.S. in 1917 as liaison engineerfor S.P.A.D. He contributed to the design of the Packard-LePere pursuit, went to work for the Air Service Engineering If there's a full-size homebuilt around that has the charm and appeal of Mike Kimbrel's Tub. we Division at McCook field. During the haven't seen it. A 100% fun flying machine. ensuing period he numbered among his colleagues, gifted men such as Ivan . . . quite a feat for what was described at interest in ultralights stimulated by an Driggs. producer of the famous Dart and the time as little more than a broomstick association with the Sorrell boys (of instrumental in the organization of body with a pair of closet doors for Hiperbipe fame), fabricated the second, McDonnell Aircraft; John Dohse and wings, powered by a 20-hp Henderson living, flying. 1924 Dormoy Bathtub. Jean Roche, builders of the original engine. ★ ★ ★ Aeronca: Orville Snyder, designer of the If we stopped here, we would have Be aware from the start, that although Curtiss-Wright Jr.; and Harold More­ what we need for the origins of the this looks like a rather simple craft, it is house. lightplane engine specialist who plane we are modeling, but I would like not. In its own way. it is one of the most was instrumental in perfecting the to take you on a bit. to see what else Mr. complex subjects that I have ever built. current Lycoming engine line. Dormoy begat. A redeeming fact is that we are working Dormoy was an early advocate of Briefly, our French genius went to in such a large scale, that 90".. of the ultralight aircraft, having envisioned a work for the Buhl Aircraft Co. and plane is simply a reduced size duplica­ strap-on, propeller-driven craft similar numbered the Buhl "Bull Pup" among tion of the full-scale. The remaining to some of the earlier Lilienthal gliders, his several accomplishments from 1925 10%, which is predominately the front but equipped with controls and a motor. to 1930. This plane embodied, for the section containing the powerplant. are At this point in history, no ultralight first time in a lightplane. an all-metal minor concessions to the fact that this is engines were available, so the idea monocoque fuselage. During the ’30s he a model. remained just that. spent several years with Boeing, where Many construction articles can incor­ After designing a simplistic biplane in he was the dominant influence in what porate the phrase. "Construction is 1923, which flew utilizing an 18-hp was then the Boeing Model 299. known rather straightforward, embodying only Henderson engine, he culminated his by all today as the B-17 Flying Fortress. basic model fabrication techniques." In minimum plane ideas in 1924, with the He had a later association with Reuben this instance, we have anything but the building of what was to become known Fleet and Consolidated, where he usual, and as such, I recommend the as “ Dorm oy’s Flying Bath Tub.’’ He helped engineer the PBY Catalina, as plane only to those who are either well entered the plane in the 1924 National well as most of the later Convair models. skilled in scale model construction, or Air Races at Dayton, Ohio, in the first So we see it was a rather extraordinary who want a strong challenge to their cross-country race for lightplanes to be man who produced our rather unortho­ developing skills. held in the U.S. He won the raceand the dox subject aircraft. The following text will only attempt to Rickenbacker Trophy with an average Some 50-odd years after the original explain some of the major construction speed of 70 mph over a 140-mile course Bathtub design, Mike Kimbrel, with his sequences and unusual details, and is certainly not a step-by-step type of chronicle. There are many areas where an alternate method or approach is possible, and I am sure some builders may favor their own methodology over my selections. It is my experience that no two scale builders will use all the same techniques for solving the various facets of construction. So do your own thing in areas where you disagree with my thinking. If you are going to build this model, begin as I did. by acquiring the following items, sources for which are listed at the end of this article. Get a copy (or two) of the September 1978 issue of Sport Aviation. Then procure a set of Mike Kimbrel’s drawings for the full-scale airplane. They are inexpensive, com­ plete, and will answer many perplexing small questions which may not be im­ mediately clear from my plans or text. Purchase a set of 6-5/8 inch wire wheels. Hank litzsch and his replica of a replica. Even at a big 1/3 scale, span is only eight feet. Flying Once having these, you will not be characteristics of the model are "different," sez Hank. satisfied with just fondling them, but will MARCH 1981 19 want to viewthem affixed to the finished work. You could perhaps use a set of Williams Bros, vintage wheels in this size, but a lot of the flavor of the subject would be lost. In retrospect, these would be a good investment for use in initial flight testing to prevent damage to the spoked jewels. I did not, and really Kimbrel have no regrets. Dormoy Bathtub The sequence of construction is of somewhat lesser importance when you Th f Kimbrel Dormoy Bathtub are building from completed plans, than Specification« it is when starting from zip and working Length...... UT Height ...... 6‘β* upward. I will narrate the following in Wing Chord 42" (45* at aileron«! Wing Area 84 sq. ft. the sequence in which I built the original Span ...... 24' Empty Weight . 302 Ibv plane, the reasons for which were Gro»t W eight. 540 Ibv Airfoil Clark Y merely my own logic. Construction — Wood »«rut and wire braced. Begin construction with the fabrica­ steel tube fuselage and taif. all fabric covered Performance — So far. top speed. 65 mph. cruise. 5S tion of the main landing gear struts. This mph; stall. 35 mph; rate of climb, 300 to 400 fpm; climb speed. 45 mph; takeoff run, 500 feet will require much study of the plans, and Engine — 40 hp 11200ccl Volkswagen Propeller - 53*30 Hegy the Kimbrel drawings will be a big help fuet —- CornuConsumption. 2 gallons per hour; □ Capacity. 5.7 gallons here as you go along, but once the Landing Gear — Heavy duty 20* bicycle rims and spokes, homemade steel hubs, Oilite bronze eneral principle is grasped, you should bearings ave no problems. Brass tubing, steel, Handling Characteristics — Normal, easy to fly. stable in pitch and yaw. normal stall, lightly built and not and silver solder are the instruments of acrobat k Improvements Planned — Cover wheels with fabric, construction. Once fabricated, keep put mag under cowl, find a more suitable prop them and the wheels around to look at, Cost — About 5600 and they will provide a stimulus for completion of the rest of the project. Using the appropriate plan section, construct two fuselage side structures. These are constructed mostly of 5/16- inch fiberglass pushrod material, into which 1/4-inch dowel has been inserted. Put a few drops of the gap filling type Hot Stuff inside the fiberglass rod, then insert a previously fitted section of 1/4- inch dowel. Leave room for insertion of Drawing courtesy of Ultra-Lite Aircraft Journal fittings as shown on the plan. Fabricate the 1/4-inch steel rod pieces for the top joint sections, and in some cases, attach of the fuselage struts, and Hot Stuff and points for further pieces or rigging pin as indicated. connections. All points of bonding to the fiberglass Next we form a tent type structure should be lightly sanded. Here again, we with the two sides, over the top view, use the gap filling Hot Stuff at joints, with the wing connector fittings over the both the main peripheral tube parts and appropriate spot. This alignment is the 5/16-inch balsa inner bracing. When rather critical to future construction, so each side is completed, drill about one measure and align carefully. Lock in inch or so through each joint with a place with pins, etc., then apply Hot 1/16-inch drill, then screw in a piece of Stuff down the middle junction point. A 2-56 threaded rod. Hot Stuff in place, couple of temporary inner braces, side and cut off to the required length. We to side, should be added to help keep Dummy fuel tank on top of the wing is re­ then haveadhesive-bonded-and-bolted the structure somewhat rigid. movable, giving access to the aileron servo.

Fuselage pod aft of the firewall is covered w ith Super Coverite; nose Tail surfaces are a combination of birch dowels, spruce sticks, and section is thin sheet aluminum, held on w ith screws. aluminum tube outlines, actuated by cables.

MARCH 1981 21

Mark's Models is now offering two sizes of the popular Bird of Time: the original 118-inch-span machine as designed by RCMB's contributing editor Dave Thornburg, and a new two-meter version. Weighs 26 ounces, w ith just under 600 square inches of wing area.

• How many times have you wondered which sailplane to design, build, or buy? Each plane has some neat features, and some that are not so neat. The trick is to */c SOARING weigh these features against one an­ other in order to measure the overall by Dr. LARRY FOGEL PHOTOS BY AUTHOR worth of each plane. Let me suggest a way to contrast scale ships against one 10 Performance S ca le sh ip F loater another, to compare scale to high- 7 Quality performance sailplanes, aerobatic to 10 Appearance thermal machines, those you have with 10 Style (aesthetic value) those you would like to have . . . and 10 Streamlining 10 5 even apples to oranges, if that’s what 7 Color 10 6 turns you on. 5 Decorations 10 7 The overall worth of any sailplane is a 4 Scale (replication fidelity) composite of its performance, the feasi­ 10 Configuration 10 0 bility of attaining that performance, and 2 Materials 4 0 6 Flight performance the longevity of the performance, once 8 0 1 Handling quality 9 0 realized. Each of these properties can be 5 Uniqueness expressed in terms of subsidiary proper­ 9 In-house (in own collection) 10 8 ties. For example, performance is qual­ 1 Out-house (in others’ hands) 9 1 ity, quantity, and timeliness. In turn, 2 Usefulness as a trainer 1 10 quality concerns appearance and 8 Quantity uniqueness. Appearance can be ex­ 6 Efficiency pressed in terms of style (aesthetic value) 10 Duration (minimum sink) 5 10 and fidelity of scale duplication. Style 3 Distance (maximum L/D) 7 7 consists of streamlining, color, and 10 Control Response decorations. Scale concerns the con­ 5 Immediacy (lack of lag) 2 8 figuration, materials. flight performance, 8 Crispness (response near neutral) 8 10 and even handling quality. 10 Accuracy (repeatability) 10 10 The table on this and the next page 9 Precision (lack of double neutral) 10 10 indicates a rather comprehensive view 10 Sensitivity (maneuver-to-stick movement ratio) 9 10 of what R/C soaring is all about. Each 4 Lack of cross-coupling (between roll and pilch, etc.) 10 8 aspect is expressed in terms of sub­ 7 Insensitive to temperature 2 2 aspects, down to the level that makes 5 Gust response 10 Stability 10 these directly measurable. For example, 10 5 Pilch 10 10 it’s easier to rate the appearance of the 2 Roll stability, yaw stability 10 10 model if you note that appearance is 2 Speed partly due to style, which, in turn, has 1 Maximum 2 1 separate identifiable factors. Of course, 10 Range 3 2 you can choose to judge at the higher 10 Stall speed 8 10 level, but it is probably more instructive 5 Ballastability 0 9 to first ask. "What does that mean?,” 3 Launch Requirement then judge each model in terms of the 5 Equipment not required 2 9 more specific considerations. 1 Extra people not required 0 10 Note that there are two aspects of 7 Range uniqueness: models within your own 9 Visual 8 9 collection and/or the chance you might 10 Radio control 10 10 see a similar one at the soaring site. 10 Landing Requirement (in view of the plane) Quantity refers to the different aspects 10 Open area 2 7 of flight performance as well as the 9 Terrain texture 2 5 requirements for launch and landing. 5 Turbulence ("roller" or other terrain effects) 3 2 Then. too. there’s the timeliness of 2 Timeliness performance. 6 Set-up lime 5 6 3 flight duration permitted (battery limit) 8 Feasibility concerns the problem of 9

24 R/C MODEL BUILDER acquiring the model. Here, the first two the beholder. Let's indicate the im­ change in my situation. Note that all of aspects are not applicable if you already portance of each feature (property, the features must be treated in a positive own the model. In that case, simply aspect, dimension, parameter, and so sense. For example, a very inexpensive disregard them. Transportability, flying forth) and use thisasa multiplying factor model is rated an 8,9, or 10 on a 10-scale, site availability, weather, and family . . . a coefficient, if you will. Let’s also while an expensive one may be a 2,1, or tolerance of the model may impact on indicate the degree of achievement on even zero, if it’s way beyond your the feasibility of acquiring an R/C each of these features for each of the budget. sailplane. Longevity concerns surviva­ models under consideration. The im­ To illustrate, the two columns to the bility, reliability, maintainability, repair- portance weights in the table charac­ right of the properties describe the ability, and replaceability. terize my present point of view. They are degree of achievement of a fine quarter- Now, all these features are probably probably very different from yours, and I scale sailplane and an excellent floater. not of equal importance to you. After all, reserve the right to change my view as The former is fully streamlined, so it to some extent, beauty is in the eye of time passes, and/or when there is a rates a 10. The latter is only moderately so, therefore it gets a 5. The floater 7 Feasibility makes no attempt at scale, thus the four 6 Acquisition time zeros. Clearly, the scaleship is almost 4 Building time required 1 3 completely unsuitable as a trainer, while 1 Purchase time (wait for delivery) 7 10 the floater is ideal. The remainder of the 8 Acquisition funding numbers speak for themselves. 6 Purchase price 1 8 Now for the arithmetic. The overall 1 Cost of other components 10 10 worth of each sailplane can be found by 1 Cost of required tools 8 10 taking the weighted arithmetic mean 4 Resale value 10 6 across this hierarchy. For example, on 10 Transportability our scaleship, take the product of the 8 To flying sites 5 9 importance of streamlining (10) and the 2 From manufacturer 8 10 achievement of that aspect (10); add to 10 Flying site availability this the importance of color (7) times the 10 Slope sites achievement of color (10) and in a 5 Height 10 10 similar manner 5 times 10 for decoration. 6 Uniformity 10 10 Divide this sum by the sum of the 10 Orientation with respect to the prevailing wind 9 9 importance weights across these three 9 Required landing area availability 9 10 8 Distance to site features (22). The result is 10. Now weigh 10 Driving time required 9 9 this sum by the importance of style alone 4 Gasoline cost 1 1 as contrasted with the sum of all features 8 Flat land sites at that level in the hierarchy (style and 10 Open area 6 6 scale); that is, multiply the sum by 10/14. 2 Orientation with respect to prevailing wind 8 8 The contribution to appearance of style 9 Terrain texture 2 2 is therefore 7.14 (on a 10-scale). 10 Weather at sites Now, multiply this value by the impor­ 9 Predictability 9 9 tance of appearance (10) in contrast with 5 Typical temperature 10 10 the other properties at that level [here 9 Suitable wind prevalence 8 8 uniqueness (5) and usefulness as a 10 Adequate visibility expected 9 9 trainer (2)]. That is, multiply 7.14 by 8 Lack of precipitation expected 9 9 10/17. The result, 4.20, is the contribu­ 9 Family tolerance tion of style to quality of the scaleship. 8 Home space belonging to plane 5 8 Now, find the contribution of style to 2 Cost of the plane 2 5 performance by multiplying 4.20 by 7/17 3 Longevity [taking into account the importance of 10 Survivability (environmental compatibility) quality (7), quantity (8), and timeliness 10 Airborne (max G limit) (2)]. The result is 1.73. Lastly, the con­ 10 Stress 3 9 7 Flutter resistance 8 10 tribution of these three style features 3 Mid-air avoidance visibility 7 8 (streamlining, color, and decoration) to 9 On-ground overall worth is found by multiplying 5 Stress of launch 6 9 1.73 by 10/20 [reflecting the importance 5 Impact of landing 4 10 of performance (10), feasibility (7), and 1 Tolerance to mishandling 2 8 longevity (3)), the result being 0.865. 9 Reliability Note that the composite weight of 10 Airborne equipment (radio, controls not binding, etc.) 10 10 each operational feature is the product 7 Ground-based equipment of the normalized weights of that fea­ 10 Transmitted 10 10 ture and all higher levels. For example, 1 Testing equipment 10 10 the overall relative importance of 8 Launching equipment (when used for this plane) 8 8 streamlining is: 3 Maintainability 7 Airborne equipment 9 9 5 Ground-based equipment 7 Transmitter 10 10 On a scale of one, this translates to 1 Test equipment 10 10 3.9%. In other words, an increase of one 2 Launch equipment 3 3 unit in streamlining contributes .39 to 7 Repairability overall worth. 10 Time required (convenience) 1 2 The arithmetic is really straightfor­ 1 Material required 5 7 ward. Within a few minutes, you can 3 Skill required 2 5 measure the contribution of any feature 2 Replaceability to any higher level and to the overall 5 Sailplane 1 5 worth of the model. For this example, 1 Components of sailplane 4 2 the overall final figure forthescaleshipis 1 Radio control system 10 10 6.3, while that of the floater is 7.3. It’s an 1 Component of radio control system 10 10 interesting exercise to rate the ships you

MARCH 1981 25 with an aspect ratio of 21 to 1. The 7-1/4 inch wing root tapers to 4-1/4 inches at the tip. The result is a computed elliptic lift distribution. The wing tip of bass­ wood avoids offering any more vertical surface than necessary, this to prevent disturbing the yaw as the plane slices through the wind shear. The airfoil is Scott's own design, almost symmetrical with a dip in the upper surface toward the trailing edge, which israzorsharp. He argues that you want to keep the boun­ dary layer on the verge of separation. At that point there is minimum shear at the surface and therefore minimum skin friction. He computes the maximum lift coefficient to be 1.3. The wing is structured of foam, with a carbon fiber full-depth single spar 5/16 of an inch wide. The surface is covered with 1/64-inch plywood, then glassed and sanded to be ripple-free. The aile­ rons are split and driven by a single servo. The split is necessary to allow flexing of the wings without binding of the ailerons. The fuselage is made of PVC foam core, covered with a hexel weave, own against one another at different version, and once launched, it is difficult twelve ounces per square foot, multi­ levels and overall. Here is a way to clarify to tell them apart. Here is a neat package directional glass cloth in two layers. The what value means to you. There is a lot for those who appreciate condensed blue foam used for forming the forward more to say about the method, but this is beauty and thermal performance. section is then eaten out by a solvent. A all you need for a first cut. Now you can Sean Walbank, currently of the Lindis- bellcrank is installed within the fin to really compare different models, differ­ farne College, Pakowhai Road, Hastings, ensure tight control of the full-flying ent combinations of planes, and even New Zealand, is also interested in the stabilizer. Scott commented that the the worth of a new soaring site. two-meter class. He offers an update on fourteen percent surface area is more If you prefer other features than the his Gryphon that took part in the 1980 than you might expect, but the greater ones I have chosen, fine and dandy. If Two-Meter World Championship. Ac­ surface area allows full control with you think I’ve missed something of cording to Sean, four of these planes are smaller angular change and therefore general interest, please let me know. I now under construction in New Zea­ less trim drag. The wing is set at +1°. The have purposely omitted reference to land. Looks like a clean design. You stabilizer is at -2°, thus there is a 3° contest winning in that this means so might like to try your hand at building decalage. The vertical fin projects below many different things to so many differ­ this craft. the fuselage to provide improved yaw ent people. What do you think? Let me introduce the Hyper/Locus, damping at high speed. A steel tail skid A case in point: you can now evaluate designed by Scott Jenkins of San Diego. projects from the caudal fin. A 3/8-inch a suggested redesign offered by Bob This new configuration is intended for stainless steel tube with an .065-inch wall Barrett. He devised a T-tail for the Mark’s high-speed and large-scale aerobatic supports the wings. A retractable 3-1/2 Models "Wanderer 99” and claims that performance. Scott calculates that a dive inch wheel will be operated byaseparate this modification has a number of bene­ from 2,000 feet will produce a 200 mph servo. Other doors can be opened fits: 1) the beauty of a T-tail; 2) the dash through the timing trap. The 130- under the fuselage in order to drop the aerodynamic advantage of having the inch wingspan covers 806 square inches lead ballast before landing. (You should stabilizer far from the wing turbulence; 3) the advantage of a full-flying stab; and 4) the ability to transport the sailplane in a carton measuring 6 by 10 by 50 inches. Bob admitted that his T-tail is a little harder to build than the conventional stock tail. To prove that he has made a contribution, Bob won first place in the very first contest he entered with this plane. More power to him. By the way, if you want plans for this mod, send $1 and a self-addressed envelope to Bob Bar­ rett, Messiah College, Grantham, PA 17027. Did you know that Mark’s Models offers a two-meter version of the Bird of Time? It looks like a little sister and flies in exactly the same way as the larger ship. The all-up weight is 26 ounces, and the wing covers almost 600 square inches. The kit offers an Eppler 205 airfoil at either eight or eleven percent thick­ ness. At eight, it’s fast and furious; at eleven, it’s a floater. I have flown both For those who like to have something a little different, Bob Barrett is selling plans for his T-tail the big Bird of Time and the two-meter modification to the Wanderer 99. Details in text.

26 R/C MODEL BUILDER attach a parachute to ease the impact, Scott!) The Hyper/Locus weighs seven pounds empty, and you can add up to seven additional pounds in ballast. The radio receiver is installed behind the wing spars, since these are conductive and might otherwise interfere with radio reception. I asked Scott how he plans to flight test this monster. "First, you’ve got to hold it aloft while driving in an open car; that allows you to set up the trim. Then, you wait for the first forty-knot gale at Torrey Pines and heave it off the edge.’’ I look forward to hearing the "swish” of what promises to be a very interesting new speed soaring challenge.

Ian Turner’s comments on the per­ formance of undercambered, flat- bottom, and semi-symmetrical airfoils, included as part of this column in the September 1980 issue, elicited a couple of opposing views from two very highly regarded soaring ethusiasts, Blaine Rawdon and Woody Blanchard Jr. Here are their letters along with a follow-up letter from Ian. “ Dear Larry, "I read with interest your September column with the information produced by Ian Turner. It is unfortunate that his interesting analysis is based on such poor assumptions, especially when real data is available in the modeling press. The effect of this information is to perpetuate the myths regarding airfoils. "The assumed values for maximum lift coefficient and maximum L/D ratio slight all of the sections, but slight semi- symmetrical sections the most. Also, his analysis appears to disregard the Scott Jenkins likes 'em fast! His latest speed/aerobatic sailplane is the "Hyper/Locus," shown issue of speed range, which is central to here ready for paint. Theoretically capable of 200 mph from a 2,000 foot dive. any discussion of airfoil sections for thermal soaring. L/D correlates much better with Rey­ case, for best L/D, it all seems to balance “ From the first batch of measure­ nolds number than with camber. out. ments that the San Fernando Valley "In fact, it was the Goose, with only 2% “ Now, let’s get to the real meat of the Silent Flyers made, one can draw some camber, that performed the best, with a issue: speed range. The reason we are quantitative conclusions regarding air­ glide ratio in the low twenties. The three using low camber sections is not for foil sections. The report of these mea­ planes in the 80,000 Reynolds number better peak performance (since it's not surements was published in the August range all had glide ratios within 5 or 10% better), but rather for better off-peak 1979 Model Aviation. We tested a series of each other. performance. The essence of soaring of models with wings all approximately "If I may offer an explanation for this is varying the speed. Full-sized pilots use 12% thick, but with camber ranging unexpected result, I would have to say greater than a two-to-one speed range from 2 to 6%. Unfortunately, we also that it is a result of Reynolds number when flying cross-country. I suspect that varied Reynolds number (Rn), but that effects and induced drag. Everyone the better R/C pilots with modern did not tend to obscure the conclusions. always talks about aspect ratio and planes are approaching this figure. Keep "With regard to maximum lift coeffi­ induced drag, but they always seem to in mind that this requires a four-to-one cient, we measured these values for forget that there is a lift coefficient ratio of the wing Cl. airplanes in steady, controlled flight: SQUARED in the numerator! If you are “ Wing sections of a given thickness Plane % camber max Cl Rn trying to make planes with equal in­ seem to have approximately equal Eagle 128 6 1.31 83,000 duced drag, the one with the least bandwidth of low drag on an arithmetic Paragon 4 1.24 85,000 camber will have the largest chord. scale, say over a range of maybe 0.7 Cl Sailaire 4 1.34 105,000 Thus, for equal speed airplanes, the one for 12 % sections. When you are starting Mirage 3 0.88 76.000 with the low camber wing will fly at the at 1.35, 0.7 down doesn’t give you much Goose 2 0.86 111,000 higher Reynolds numbers. To reiterate of a ratio. When you start at 0.86, it sure "You can see that max Cl falls with in reverse, if you have equal weight does. This is the reason that good pilots reduced camber, but not nearly to the airplanes that fly at equal speeds, they enjoy low camber sections. degree that Turner indicates. will have equal induced drag, but the "Another tidbit from our tests is the "Turner’s biggest error is in assuming low cambersection will havethegreatest linear relationship between camber and that low camber sections have worse chord, and thus the greatest Reynolds optimum (best L/D) Cl. We found 2% glide ratios than high camber sections. number, other things equal. best at 0.55, 3%at 0.64,4%at 0.73, and 6% He has forgotten that along with lower "Offsetting this effect is the lower at 0.91. Now, this is going to vary with lift, the low camber sections also cause profile drag force of the smaller chord, less drag. We found in our tests that best high Cl wing, Rn effects ignored. In any Continued on page 78

MARCH 1981 27 A RADICAL PROPOSAL FOR SOARING CONTESTS even at most contests. We need to make That golden age is gone forever. The DAVE THORNBURG. . . a clear distinction between the small, contests that were consistently well- local, five-to-fifty-man contests that are organized and expertly run, such as the • I just finished reading Charlie Speer’s still the backbone of competitive soar­ SOAR Nats, grew bigger and more coverage of the Soaring events at the ing, and the 100 to 200+ biggies such as demanding every year, until they ulti­ 1980 Nationals in Dayton. It was a well- the LSF Regionals and the AMA Nats. mately burned out the sponsoring club. balanced article: he began by describing The small contests . .. the friendly, low- How many times can you ask the same the camaraderie of a national event, the key, one-day events, the contests where five to ten people to donate, absolutely evening bull-sessions with "old friends" every flier knows the CD personally and free, a long weekend of damned hard you meet only once or twice a year, the is glad to pitch in and help set up the work for the entertainment of an ever­ excitement of rubbing elbows with winches, and doesn’t much care whether growing group of relative strangers? some of the big names in soaring, the the first flight group gets off at 9:00 sharp Under these conditions, the "age-old trading of ideas, the swapping of lies. as scheduled .. . these contests we need problem of workers" that Charlie Speer He ended with the handwriting on the to leave jolly well alone. talks about in his Nats coverage is only wall: the event drew over 200 entries. Label them AM for "amateur.” Not going to get worse and worse. and was plagued every day by a shortage because the pilots who enter them are The solution is simple: pay the help, of manpower. Contestants, some of amateurs, but because the officials who and pay them well. whom had traveled 2,500 miles to com­ run them are unpaid volunteers. Be­ Consider a two-day, 100-man contest. pete, had to "pitch in and set up the cause the CD and winchmaster and To run it well, to run it professionally, to officials area, PA system, impound scorekeeper are also competitors, sand­ run it in a manner that will build its stations, and winches." wiching their flights in between their reputation and make people want to As I read Charlie’s article I couldn't official duties. Label these contests AM come back next year, you need at least help thinking of the old SOAR Nationals for amateur, and expect to pay the twelve experienced, dependable that Dan Pruss and his accomplices in customary $2-$10 entry fees. workers: four winchmasters, four timers, the Chicago area S.O.A.R. club ran for so But when one of the biggies comes an impound official, two scorekeepers, many years, back in the early seventies. I along, a regional or national event, an and a CD. These twelve people are going attended the 1974 event, and it was event that’s expected to draw 100 or to put in two man-days each, at $75 per grand .. . a true gathering of eagles. more fliers, then label it PRO and tack day. Total cost: $1800. Collect $20 from People came to SOAR from every corner on an additional $20-$30 to the entry fee each entrant as "manpower fee” and of the country, the cream of America’s for the manpower fund. you have your $1800, plus $200 to pay the competitive sailplaners, all the hotshots What! ? A $40 entry fee? Who’s going to kids who retrieve the lines. from the hinterlands, all the Grand pay that kind of money to fly in a glider This system is to everyone’s advan­ Dragons of the soaring clan. contest? tage. Let’s look at it first from the point of But when I went back in 75. it was Answer: we are. view of the CD: clear that the end was at hand: there It's time we talked seriously about the • Paid help can be expected to show were the same eight or ten contest cost of our entertainment, gentlemen. up on time. If a winchmaster shows up officials doing the same thankless tasks Forty dollars for a two-day contest works late, he may find someone else sitting for three long hot summer days. And out to around $2 per on-the-field hour. on his winch, someone who needs the doing it for almost 200 contestants. The Have you priced a two-day workshop money more than he does. following year, 1976. the SOAR Nats lately? A two-day rock concert? Twenty • Paid help can be expected to work died from overweight. . . and overwork. hours on a handball court? "Experi­ harder. If they don't, they can find some Overwork . . . and underpay. ential” entertainment, in which you other way to pay for their new radio The manpower problem (overwork actively participate, rather than just system. and underpay) plagues small contests as watch, costs money. The people who • Paid help can be bossed more well. At this year’s FAI Finals, out in L.A., organize and orchestrate such enter­ effectively. If they’re "on salary,” there a grand total of five people showed up tainment may or may not get rich from it, should be no shyness about asking them consistently, all three days, to help run but thet are not such fools as to do it for to do anything and everything necessary the contest that was to select America’s nothing. Ask any sociologist; volun- to the smooth running of the contest. world-class soaring team. Beyond doubt, teerism only works in small and relatively • Paid help can be expected to be the manpower shortage at this contest personal group situations. more professional. They weren’t made a significant difference in the We've been living in the past long suckered into this job, they’re getting a outcome of the meet. I can assure you. / enough, regarding the actual costs in professional wage for doing a profes­ will never be a part of another team time and human energy of sponsoring a sional job, and they have every right to selection process that is run with volun­ major soaring event. When the sport was take pride in their work. teer labor. We had no help to police line young, and everyone knew everyone • Paid help can be organized in lengths, keep the field clear of unused else and was honored to be part of the advance. The reason most contests are winches, or process the official models. small and elite and growing group of so badly run is because the few people As CD. I was on the PA system constant­ sailplaners. manning a contest was less who do volunteer have no idea before­ ly, begging for timers. Twoof them were difficult. Enthusiasm ran high among the hand what their jobs are going to entail volunteers off the street, who had never newly-formed clubs, and each group ("Sure, I’ll be a tim e r. . . anybody got a seen a model airplane contest before! took pride in how many entrants their stopwatch I can borrow? How do you The moral of all these stories seems contest drew. If you traveled a long read this thing?"). plain: there are some soaring contests distance to fly in a contest, you flattered • Paid help can be expected to put in too big, or too important, to be run by the sponsors, and they thanked you a full day. No more, "Yeah, I can help, volunteers In short, the time has come sincerely for coming. Just the satisfac­ but only till 10:00. I’m getting married at to start paying our contest officials for tion of running a well-attended event eleven." their work. was reward enough for the folk who Not at every contest, mind vou. Not put it on. Continued on page 97

28 R/C MODEL BUILDER cRs f ø % » g

By DICK HANSON . . . Part 11: The Square Horizontal Eight.

• For openers this month, we have a few tions, Vertical Roll, Aileron Turn, Figure Recognize that you are working with­ things to say concerning the flight M, Inverted Spin, Square Horizontal in aset of rules that allow a total of 11 lbs. programs now being used. Eight, Triangle Rolling Loop, Reverse gross, powered by an engine of .61 cu. AMA Pattern competition is broken Knife Edge, Reverse Point Roll, Reverse inch displacement. The 11 lb. rule is into classes intended to offer competi­ Top Hat, Square Loop with four 1/2-rolls, presently being pushed hard by tion in various skill levels among parti­ Two Snap Rolls in opposite directions, some competitors, if not flagrantly vio­ cipants who use equipment that is for and Figure M with 1/4-rolls. So, we have lated by them. I expect to see it raised to the most part the same. I know that some 20 new maneuvers and 16 others which 11 lbs. dry weight to conform with F.A.I. people feel there is a tremendous we already know. Now take your rule- rules. difference in engines, airframes, radios, book and read through the descriptions Don’t look to see the .61 engine rule and accessories; however, if you of the twenty new maneuvers, then ask raised. If we give the present breed of .60 examine the winning setups in any class yourself this question: "What’s so spe­ size engines a little thought we will see you will see that they are quite similar. cial about Masters class maneuvers?" that they are capable of delivering Some competitors want to restrict The answer is that aside from the tremendous power. . . but they must rev equipment in order to "keeep things Avalanche, Two Rolls in opposite direc­ up to do it. The limiting factor is appar­ affordable," or "bring in new blood," or tions, Inverted Spin. Square Eight, Tri­ ently the propeller lengths now being "make Novice for novices," etc. I say, angle Rolling Loop, Reverse Knife Edge, used. Our 11-inch props will not run "Bullfeathers.” Anytime you introduce Reverse Point Roll, Square Loop with above 20,000 rpm (for all practical restraints or require retrogressive rules four 1/2-rolls and Two Snaps in opposite purposes) but the engines will produce you defy a basic rule of modeling. What directions (a total of nine), most are the more power at these rpm’s. The life span rule is that? I'm glad you asked. That same or slight variations of known of our engines will drop a little at these rule is "Modelers are basically inquisi­ maneuvers used in all lower classes. speeds, however. The current strong tive people who like to try new things." Now here comes the zinger. It is engines run at approximately 15.000rpm We all know that a few rules are neces­ possible in the Masters class to put on the ground using average 11x7 props. sary, but a very disconcerting thing together a pattern under the 450-point, Depending on the airframe used, these happens when certain people have to 14-maneuver rule that is not really any will run about 18.000 rpm in level flight. work within rules and other people more difficult than the Expert pattern Now, here’s the problem. The props work within a less restrictive atmos­ now being used. I don't think I’m the necessary to extract maximum engine phere. When these groups get together, the latter group usually enjoys a compe­ titive edge because they can do what­ ever is necessary to improve perfor­ mance. Now. what's the point of this rambling? I believe that the rules for Masters class should basically be the rules used for all classes. The progression would then be through a classification based on a K factor of maneuversperformed. It would take some sorting out to arrive at a class breakdown, but something on the order of, say a 450-point class, a 300-point class, etc. might work. The MANEUVER. {SEE TEXT FOR CLARIFICATION). advantages would be several. First, you would eliminate the "Novice" or "Mas­ only one who has noticed this situation. power are too short to produce high ter" titles which are a little bit of a sore I would love to hear from anybody who thrust at low airspeed: the best I’ve seen spot with some fliers. Secondly, it could has strong feelings on changing the is approximately eight to nine lbs. thrust lead to a more rapid exposure of com­ classification system. Methinks it's (static). The answer appears to lie in plex maneuvers for newer fliers who overdue. several directions: geared engines (belt want the challenge and are capable of On to the flying portion of this drives also), vari-pitch props, twin rapid learning. Also, I have noticed that month’s writing. .. propeller engines, multi-cylinder ar­ the skill level between the top three Most folks who are presently flying in rangements, etc. Remember, you won’t fliers in a typical class (Novice, Ad­ Masters class competition already have increase engine power with the geared vanced, etc.), is sometimes undetect­ preconceived notions as to what con­ setups, but you will increase efficiency able, and that style alone separates the stitutes a winning setup which will at lower speeds. scores. This can be maddening to the perform the maneuvers required. If you Airframe size can now be increased competitor. Why not let him change a read through the maneuvers previously BUT the weight cannot be increased, loop for a roll, as Masters fliers do to described you will see a growing need because even though the bigger air­ improve their possible positions? for a lightly loaded (low wing loading) frame will carry more, the engine is still Notice that the Masters class includes airframe with the ability to accelerate the same size (power) regardless of prop many (16) of the maneuvers used in the from low speed without any wobble or size. You simply have better low-speed lower classes. It also offers special torque reaction. There are different performance. patterns not used in those classes. The ways of approaching the problem: The twin engine (twin propeller) special ones are as follows: Reverse 1) Build the model lighter. design could be a real performer with Cuban Eight, Horizontal Eight, Vertical 2) Get more power from the existing enough research, because the propellers Eight, Reverse Double Immelmann, .60 size engine. could be placed for maximum efficiency. Cobra Roll, Three Reverse Inside Loops, 3) Build a larger model. Avalanche, Two Rolls in opposite direc­ 4) Build a smaller model. Continued on page 84

MARCH 1981 29 A flyable P-12E is on exhibit at the Planes of Fame Museum, Chino Airport, California. It has worn many different colors, including that of an F48-3with razorback headrest. BOEING By PETER WESTBURG © © P-12E • P-12E's with the razorback headrests, japan. called "Panama Conversion Kits," are The lone Model 100A was a special often mistakenly identified as P-12F's. two-seater built for Howard Hughes, Possibly, some were. The 24th Pursuit who further modified it before selling it Squadron flew from France Field in the to race pilot Art Goebel, who changed it Canal Zone, and the 1st Pursuit Group back to a single-seater. Two Model was stationed in the Philippine Islands, 100E’s like the P-12E were delivered to Because these squadrons flew over Siam (Thailand) and one supposedly water, the Army Air Corps decided they remains in the museum in Bangkok. ought to have life rafts; the rafts were One 100F was purchased by Pratt & incorporated in the headrests, resulting Whitney to test the 700 hp Wasp Jr. After A 500-hp P&W Wasp powered the P-I2E; prop was a Hamilton Standard adjustable pitch. in the long razorback shape. Curiously, a demonstration of a quick engine Scoop aft of engine was for oil tank cooling, some of these razorbacks flew from change and during a subsequent test exit on opposite side. Selfridge Field in Michigan and were flight, the pilot lost consciousness due to fitted with skis for winter maneuvers in an oxygen system failure and the air­ the Dakotas and sported a standing plane fell into a spin. An adjustable polar bear on the anti-drag ring. weight in the aft fuselage, used to An interesting footnote to the story of balance the various test engines, broke the P-12E is what happened to the loose and jammed the flight controls. original prototype, Model 218. After its Plane and pilot were lost. test program, Boeingsold it to Nationalist A flyable P-12E, AC 32-17, is hangared China where it was flown by an Ameri­ at the Planes of Fame Museum, Chino can volunteer. Bob Short. On his first Airport, California, where anyone may flight, he intercepted three Japanese see it. It has an uprated Wasp of 600 hp fighters, shooting down two before he and a controllable pitch prop. Missing was downed by the third. The year was are the wing and cabane strut and axle 1932, long before the Flying Tigers came fairings, and it has a razorback headrest. into being. Any model maker with experience in Four Model 100’s, similar to the P-12 fiberglass is invited to make fairings and and F4B-1, were sold to civilians. NS-21 a curved headrest for the airplane. went to the Bureau of Air Commerce No better subject than that P-12E is (FAA); NX-872H was bought by Pratt & available for modeling if coloring and Whitney as a test airplane for improved marking is your thing. The variety is too Wasp and Hornet engines; the 3rd, great to be covered here. Two of the 873H, was used by Boeing for testing best sources for color and markings are before being sold to Paul Mantz; and Profile No. 2 and Dana Bell’s Air Force "A jug of wine, a loaf of bread, and a flight of NX-874H was sold to the Mitsui Co. in Colors, Vo I. I; 1926-7942. · P-12E’s ."

30 R/C MODEL BUILDER

symmetrical airfoil, it doesn’t know the difference between upright and inverted flight. I had read that jets have a lag time PRODUCTS IN USE on throttle response; I didn’t find this THE BYRON ORIGINALS MIG-15, by LARRY JOLLY aspect of jet flight uncomfortable with regard to the MiG. I pointed the ship PHOTOS BY AUTHOR downwind, brought the throttle back, coasted through the base and floated • I think every modeler has a pet peeve. the 150-foot marker. Having never flown her down the final to a smooth touch­ Mine is to see a scale model of a jet- a jet before, I wasn't sure about the down and rollout. The Byron MiG-15 powered aircraft with a prop stuck on throttle response or what to expect. I really had me hooked. the nose. I realize that when the motor is remember how neat the MiG looked, Back in the pits, I checked the ship running you can’t see the prop; what waiting for my command. I pushed the over. I found the aileron trim problem to bothers me is the fact that most modelers throttle forward and she started to roll. be in the elevators. The MiG has split tend to be ingenious and take on a The acceleration was slower than with a elevators, with the pushrod tied in with a challenge with enthusiasm. Putting a propeller-driven craft, but when the air­ Y-fitting. I found that one pushrod hada propeller on a jet is just an easy way out. plane passed me it seemed ready to take slight bind and, as a result one elevator Then came the ducted fans. I remem­ off. Slight back pressure on the elevator got more throw than the other. This ber the first scratch-built fan I saw fly; it brought the nose up and in the next differential throw was sufficient to roll took a racing .40 with a makeshift carbu­ second my MiG-15 was airborne. I put the plane. I decided to fly the MiG again, retor. hot racing fuel, consumed a glow the jet into a gentle climbing right-hand but first I readjusted the needle valve to plug per run. and it flew like a pig. That circuit; by the time I hadcompleted that lean the engine out. This time the MiG was almost the end for ducted fans as far first 180 degree turn, the airplane was screamed down the runway; after a 100- as I was concerned. Then by chance, I about 200 feet up. The MiG seemed to foot roll she was ready to fly. This time saw the advertisement for the Byron need a bit of left aileron trim, but the the MiG left the ground with authority, MiG-15. It takes a .60 size motor, sport amount of trim varied with the airspeed. maintaining a 30-degree climb easily. I fuel, and weighs only 8-1/2 pounds. The Once trimmed. I decided to see what made several high-speed passes and MiG-15 seemed to make more sense all the MiG would do. Aileron response figured the MiG was speeding along at the time. I reasoned that since most .40 proved to be quick; rolls were great; 80 mph. Later a radar gun confirmed the size models weigh around four to six four-points were no sweat; loops were model was in the 90mph range. With the pounds, nine or ten pounds seemed a large and round. Since the MiG-15 has a leaner setting the MiG’s good perfor- lot for a .40 to haul around, but a .60 would be loafing at 8-1/2 pounds, especially with600square inchesof wing area. After completing the Byron MiG-15 I have nothing but enthusiasm for this product. Byron did it right. Their jet flies great . . . in fact, it flies very scale-like. Let me share the first two flights with you. We finished the MiG late Saturday afternoon and, after a short picture session we drove to nearby Mile Square Park for the test flights. We had the MiG fueled up and the radio range checked in short order. The starting procedure for the MiG is very simple; on the second hit with the starter, the O.S. .61 V.F. came to life. Here's what you get . .. well, almost. The engine and fiberglassing kit (on the right) don't come I taxied the MiG down the runway to in the box, but everything else does. A pretty impressive package for $136.55.

32 R/C MODEL BUILDER mance changed to fantastic. The air­ plane can be a real hot-dog, but watch over-the-top snaps, close to the ground; if coaxed, the MiG will spin. Now let's talk about the construction phase. The MiG-15 comes in a large, well-packaged shipping box. The first time I looked in the box I was impressed by both the quality and quantity of materials in the kit. The fuselage caught my eye; it is high quality fiberglass and extremely light. All the pushrods are installed,asis the main bulkheadand fan unit. The rest of the construction con­ sists of balsa or plywood reinforced Byro-foam. All the necessary hardware is enclosed in the kit. It’s been said that the MiG-15 instruc­ tion manual leaves a little to be desired. I disagree: Byron’s booklet is very infor­ mative, and I had no trouble following the construction format. The aircraft is built very logically; if you have prob­ lems, reread the booklet and try fitting the pieces, I think you’ll find that the MiG goes together very easily. Actual construction time for the MiG is very low. I spent most of my time finishing the model. The fuselage is From left: Jim Jolly (who helped with construction), Dennis Brandt, reviewer and ace flier painted, but the foam parts must be Larry Jolly, and Jim Nikitopoulos. covered with Econokote or fiberglass, before painting. Depending on which of the four versions you choose to model, you wouldn’t necessarily have to paint the Econokote. I chose the Russian aero­ batic version, which is basically red on top and white on the bottom. Because I wanted a smooth, long-lasting finish, I glassed my model. Bear in mind, if you want to get in the airquickly, Econokote your model. If you want a contest type finish you just can’t beat epoxy and fiberglass. I used Byron’s optional glass kit; it consists of generous amounts of epoxy and fiberglass, and an excellent instruction booklet. The parts were covered with relative ease, and before long I was ready for primer. I used the K&B Superpoxy finishing system on the MiG. I’m very proud of the results, and I’ve received many compliments on its finish. I chose the O.S. Max .61 V.F. to power my model. The O.S., while not the most powerful motor tested by Byron, provides excel­ lent power and reliability. The radio used was the new Airtronics XL series; it Byron's optional fiberglassing kit sells for $22.50. Adds weight, but makes the foam flying sur also was a good choice for the MiG, faces much less susceptible to "hangar rash," plus provides a good base for the paint. proving to be very reliable. I find putting the servo and pushrod in the best location and then adjusting the servo direction with the reversing switches very useful. If you’re thinking of getting into ducted fans, you just can’t go wrong with the Byron MiG-15. The combina­ tion of this airplane, the O.S. Max .61 V.F., and the Airtronics XL system has proven to me that ducted fans need not be complicated or critical. In fact, the one word describing the MiG-15would be "non-critical.” This is an aircraft that the average radio control enthusiast can build, fly, and enjoy. Byron, my hat’s off to you. I enjoyed the MiG so much, I am Another option is the Byro-Jet tuned pipe system for $48.95. Ten different models are available now constructing the Byron F-16. · to fit various engines; see Byron's ad on p. 68 and 69 of this issue.

MARCH 1981 33 elsewhere in this issue. Photo No. 2 shows a series of tools you can make quite inexpensively. Yes, regardless of what you may think at first, these are indeed quite useful tools. Believe me, I use them every day in working on engines. Across the top are various diameter hardwood dowels, a couple of pieces of maple engine beam Laguna Hills, CA 92653 mounts, and a flat square of 1/8-inch • As promised last month, this is the first made of a no-mar material, something plywood. of an extended series of articles on that will not dent or damage metal. On the lower left are short lengths of engine maintenance. The objective is to Let’s pause here for a moment to music wire. Both the dowels and music show how to properly care for, clean, outline how the recommendations for wire must have square, flat ends. Surely apd repair ANY engine without the use tools will be presented. There will be a you’ll be able to find some friend who of an elaborate and expensive array of comment, as each tool or set is dis­ will let you use his power sander and special tools and machines. It’s relatively cussed, as to whether you’ll need it, or if bench grinder to square off the ends. easy to do if you have a well-equipped it’s an optional, nice-to-have item. While you’re at it, bend and grind up shop; however, the overwhelming There’ll also be a general price and some pieces of music wire as shown in majority of modelers do not. Hopefully, source of supply listed. Finally, at the the lower right area of the picture. Look the series will show a person of average end of this article, there will be a list of carefully at the shape of the ends of mechanical ability how to adapt, make, sources for tools and catalogs. these. Each has its own particular use, as and use simple tools to get the job done. On the right in our “ hammer” pic­ we’ll see in later articles. That brings us to the first subject; ture, you’ll see a small ball-peen ham­ The dimensions of all of these home­ tools. Some of them you’ll have to buy, mer. You probably won’t findthisone in made tools can be closely approximated and some of them you’ll make, but a typical hardware store, since it only from the ruler in the picture. You don’t they’re all qu’te ordinary. Take a look at weighs five ounces. Some good sources necessarily have to make all of these the three accompanying photographs. are suppliers for jewelry or hobby shops immediately. The point is that some You’ll recognize most of the tools, for lapidary and gem craft. Check the most useful tools can be made very especially Photo No. 1., which may Yellow Pages. The price should be in the inexpensively, and you’ll probably find appear at first glance to be a picture of a $4.00 range. If you fly 1/2A, you’ll yourself inventing other forms of tools. bunch of hammers! Now, please don’t especially need this weight hammer for The only limit is your imagination. Think think that I’m some kind of a nut who resetting the ball socket joint of the of all of these as push-and-pull tools, delights in pounding on engines with piston and connecting rod. Continued on page 81 hammers. These are not common ham­ Next to the ball-peen is a steel bench mers (which usually weigh about 25 block. It's nothing more than about a ounces). three-inch-square, 5/8 or 3/4-inch-thick On the left is a rawhide mallet that piece of steel. . . with one exception: it weighs between two and three ounces. must have a flat, smooth surface. Some The neck of the handle is a scant 5/16- people refer to it as a hammering block, inch in diameter. The twelve-inch ruler and that’s about what it is. It’s also ideal in the photograph will provide you with for resetting ball-socket joints. Again, a good idea of the other dimensions. for $5.00 or so you can get one from a Next is another mallet; this one has jeweler’s supplier. Better still, hunt plastic faces and weighs six ounces. Each around a scrap yard or steel supplier. mallet costs about $7.00. However, these You’ll probably get one free. Just be sure are premium quality. Certainly, quite it’s smooth and flat. adequate and less expensive ones are The last item in the photo, just under available. Check your local hardware the steel block, is a 1/2A piston/rod store or Sears and Roebuck. You don’t reset tool, an absolute must for Cox Photo No. 1. "D on’t force it, get a bigger ham­ have to buy both of these mallets, but engines. They’re also available for .020 mer." Not to worry, these are very light­ you will need at least one mallet. It and .09 engines, $2.95 from Kustom weight tools designed for precision work. should be light in weight and have faces Kraftsmanship. See an advertisement Text tells where to get ’em.

Photo No. 2. Here are a bunch of quite useful tools you can make Photo No. 3. Just some of the various store-bought tools needed to yourself. Make them up as the need arises. do your own engine work. All high-quality stuff.

34 R/C MODEL BUILDER By RAY HOSTETLER

• The last two months have been the correlation of throttle with pitch, to trim. The proper way to set your idle is: busiest (and most exciting) period of our achieve a constant rotor speed in all At low throttle, low trim, engine idle just lives. During that time we’ve experi­ areas of flight. a shade below clutch engagement; at enced a move across the country to Long Since a true constant rotor speed is low throttle, half trim, clutch engaged Beach, California, a new job, and a lot of not possible without a governor or and blades turning; at low throttle, high new friends. quasi-governor (which may be added trim, blades rotating faster yet. We must admit the real excitement is with some increase in the complexity of If you can shut off the engine in your the new job, and that is flying full-size the system), we have to accept some collective pitch helicopter at low helicopters! Right now we’re still in variance in rotor rpm, especially toward throttle, low trim, you are not bringing flight school at Pacific Wing and Rotor, idle, where we have to disengage the in the throttle fast enough. You should so it'll be a while before we're actually clutch. To minimize the foregoing have to stoop over and physically shut flying for a living. But we love every problem, the first rule of collective pitch off the engine at low throttle, low trim! minute of it, and in the months to come setup is to open the throttle as soon as In fact, some of the best flying ships we’d like to report some of the similari­ possible to get rotor rpm up to operating we've had were set up so the clutch ties we find between the model and the speed. You have probably read in the would not disengage at low throttle, low full-size ship. But before we get into the manuals; Engine shut-off at low throttle, trim. This is going a little too far, because subject material for this month, we will low trim; engine idle at lowthrottle, half it is necessary to crawl on your belly say that while there are differences from trim; clutch engage at low throttle, high Continued on page 80 model to full-size, the similarities far outweigh the differences. This month, we’re going to examine collective pitch, and explain how to set it up properly in your helicopter. Collective pitch is the raising and lowering of the angle of attack of both rotor blades at the same time, serving to increase or decrease the production of lift, respectively. This contrasts to cyclic pitch, where one blade increases and the other decreases angle of attack, essentially giving a lift imbalance and allowing right-left, fore-aft motion without increasing total lift itself. Of course, fixed pitch helicopters increase or decrease total lift by speed­ ing up or slowing down the rotor rpm, with no pitch change involved. If set up properly, collective pitch is the "only way to fly.” However, a properly set up fixed pitch machine will outfly a poorly set up collective bird. But with fixed and collective helicopters set up equally well, the collective chopper will easily outfly the fixed pitch chopper. As an example, we talked with one fellow who had problems with his collective pitch helicopter. It would get light on the skids, bounce around, but would not fly. Upon initial examination the problem appeared. Collective pitch had been set up backwards; as throttle increased, collective pitch decreased. The chopper would get light, but as soon as he gave a little more throttle to lift to a hover, what pitch was remaining was taken out, and the helicopter settled back to earth. While this example is not intended to make light of the mistake made, it serves to show that you must understand why and how your heli­ copter flies, then take the correct steps and sufficient care to set it up right. From the last example it is clear that as we increase pitch we must also increase throttle to overcome the increased drag that comes along with the increase in lift. The key to the perfect collective pitch setup is to provide the best possible

MARCH 1981 35 normal fast-charge operation the digital readout voltmeter will be reading a combination of the pack voltage and charger voltage. During charge this reading will climb higher and higher, although fairly slowly during the last couple of minutes of charge. Don’t ask that I explain it, but it has been found that our ni-cd batteries will be fully charged when this voltage peaks and that as soon as the voltage reading starts dropping, we are putting the batteries into an overcharge condition. Using a digital readout voltmeter, this rise and fall in voltage can easily be monitored. You just stand there watch­ ing the meter, and as soon as the display shows a drop of .01 volt, you unhook everything and go race. However, spending a lot of time watching a charger silently go about its work is not a whole lot of fun. So, with this charger you can dial in a cut-off voltage using the previously mentioned adjust and press buttons. Let’s say that The latest in ni-cd chargers from JoMac. Obviously designed for electric R/C cars, but ought to the pack being charged has consistently find uses in all types of R/C modeling. peaked at 10.34 volts. Remember, this is a combined reading of charger and pack voltage, which explains why it is so much higher than the expected 7.2 volts of the six-cell pack. And also remember that every pack is different, we are only using R/C AUTO NEWS 10.34 volts as an example, this value can vary quite a bit. * By DAN RUTHERFORD puntntPHOTOS » BY v il AUTHOR itunn But this pack does peak at 10.34 volts, so the cut-off voltage I would dial in THE LATEST IN CHARGERS but that is getting too obvious to men­ would be 10.10, assuming that every­ Admittedly, it is a bit difficult to get tion, I would suppose. At any rate, as thing is normal as far as the pack is very excited about an item as mundane soon as the pack is plugged in, the concerned. Actually, if I had some spare and common as a charger for the electric voltmeter in the JoMac charger reads time I would probably dial in a cut-off of cars, but JoMac has now released its and constantly displays the voltage of 9.8 volts, doing the last bit of charge at model number 803 constant current the pack and (remember this) displays it the two-amp rate, or if in a rush, I might charger, and it is a special bit of trickery. down to 1/100 volt. even punch in a higher cut-off voltage, If your first reaction is that JoMac At this point, I usually press the button knowing that if called to the line in a already has a constant current charger, marked “ press” (isn’t it remarkable how hurry the pack would contain very close as well as the resistance type, you’re all of this stuff just falls into place?) to a maximum charge. right, but this new number features a which brings a cut-off voltage into the In operation, as soon as the actual digital readout. You’ve seen racers hook display. This reading can be adjusted pack/charger voltage is equal to the up a whatever charger to the batteries with the "adjust" knob, and here is preset cut-off voltage, the charger auto­ and then also clip on the leads of a digital where you will have to be careful. In matically terminates fast charge and output voltmeter? Well. JoMac just added this extra piece right into the charger, along with a couple of other convenience items. Just so you will know what the charger does without having to buy one sight unseen, I will describe the charging process, but I want to first caution you to read and totally understand all instruc­ tions contained with any charger used to fast-charge ni-cd batteries, and this is especially important in the case of the new JoMac charger. This charger has been designed to meet the demands of active racers, and so a couple of com­ promises have been made that lean toward getting 100% charges with maxi­ mum convenience. Most of the time, this charger will be used to fast-charge six-cell ni-cd packs (sub-C cells) in the 1/12 cars. So, dead little pack in your hands, it is plugged into the output lead of the charger. The leads from the other side of the charger are of course hooked up to a 12-volt Delta's latest is this 1/18 scale electric car, photographed here next to a 1/12 BoLink car. More source, such as an automobile battery, poop in text. If you think it looks small here, you should see it next to a 1/8 gas car. . . 36 R/C MODEL BUILDER switches to slow charge. The important thing to note here is that the charger only switches off when preset voltage is equalled. If this is set too high (in our example any voltage over 10.34 would be too high), the charger will never turn off; instead it will just keep pumping in the charge. Or, just as damaging, if for some reason the pack being charged cannot reach the usual voltage, again the charger won't kick itself off. What I have been doing with this charger is to simply give any completely discharged packs a full 15-minute fast charge, the cut-off voltage set .20 volts below the expected peak, and in this case this cut-off is merely insurance against the 15-minute charge being too long. Unless something is seriously wrong, the 15-minute charge will never do any damage to the pack, but then it won’t give it a full charge either. When the built-in timer shuts the charger down I will run the timer back up to at least five minutes and set the cut-off voltage very close to what the actual peak is. As insurance, the timer is then set to the number of minutes it should take to get full charge. The idea is to constantly monitor the voltmeter, always ready to terminate fast-charge, yet to also have some assurance that distractions won’t result in a cooked pack. Experience in using the charger is valuable, as you soon get a feel for what is going on and how long it takes to peak each battery pack. Also note that what we have been talking about is using the charger to get MRP (Model Racing Products) is molding replacement Lexan body shells for the popular MRC maximum charge. This is only necessary Rough Rider and Sand Scorcher off-road cars. Lighter than stock bodies, they are also stronger for racing, and depending upon your in most impacts and can be purchased either clear or painted. area’s length of heats and main events, may or may not be absolutely required. For just squirrelling around, absolute Delta, previously known for being into local indoor track. Race Car World, and maximum charges are not needed, the 1/8 gas cars exclusively. There should be the car worked quite well right off the odd chance of overcharging simply not a picture someplace close. The car has bat. Not as fast as the average 1/12- being worth the extra few seconds of running gear only assembled, all I had scale six-cell car, but plenty quick none­ run time. time for before taking pictures. At least theless and handling like you would As you have probably figured out, the that was how it seemed at the time. It expect from any good race car. By the JoMac charger can also be used as a turned out that finishing the car was just time you read this. Delta will no doubt voltmeter; just solder test leads onto the a matter of sticking the radio stuff (Rx, have production pieces available. The appropriate connectors and you're in electronic speed control and one servo) on? pictured is just like production cars business. Equally obvious is the fact that in place with servo tape, likewise with even though actually a hand-made the charger can fast-charge many battery the six-cell battery pack, and it was ready prototype. Anyway, contact Delta Man­ packs used in other types of R/C model­ to race. ufacturing, 27 Race Car Court, Lorimor, ing. In fact, it appears that R/C car racers Race/ Yes. ready to race; this thing is IA 50149, or call (515) 763-2220 for have discovered a little trick in charging hardly a toy. I took the car over to our further information. By the next column ni-cds (the peak voltage thing) that the I willhavea bunch more to say about this other branchesof R/C modeldom either scale in general, the Delta 1/18 car in could not discover or failed to utilize. particular. Whatever the case, for the past couple of REQUIRED READING years I have been using other models of Once involved in R/C car racing, most JoMac chargers, in conjunction with a racers want to know as much about it as whole slug of home-brew patch cords they can, yet it could take forever to and a separate, hand-held digital readout learn even the basics from reading voltmeter to fast-charge battery packs in columns such as this. What is needed is a all manner of flying R/C models and a book that covers it all, giving you a good number of different R/C systems. Now head start on things. Just such a book is that JoMac has put the whole package available .. . actually has been for a year into one box, they offer the only fast- or so, but has now been released in an charger I am aware of that accurately updated form, assuring you of the latest monitors pack voltage, and so is the only in information. More specifically, one that will give full charges. Robert Schleicher, author of Model Car R a cin g , had to do something DELTA 1/18 SCALE ELECTRIC CAR concerning the differential units thal Yes, that’s right, a 7/78 scale R/C car. The best book available for the R/C car racer, Possibly even more surprising, it’s from a super writing job by Bob Schleicher. Continued on page 84 MARCH 1981 37 • Credit for this month’s lead item should go to John W. Tidey, President of NACA, for an excellent report on the first NACA Australian Vintage and Old Timer Competition. Held at the Salt Ash Drop Zone on October 12, the meet turned out to be an enthusiastic affair, albeit a little low in the number of entries for a meet of this size. Tidey says this was to be expected for the first meet when considering the distances in­ volved, particularly in South Australia. Those who did attend the meet had a great time both from the standpoint of good competition and just plain out- and-out fun. Picture No. 1 shows a Miss America Photo No. 1. John Tidey scaled down the Miss America to suit an O.S. .25 motor, flew at the scaled down to suit the power of an O.S. NACA Australian Vintage and Old Timer Competition. Good-flying combination. .25. Builder John Tidey, who residesat 36 Claremont Ave., Adamstown Heights, N.S.W. 2289, Australia, reports the combination is darn near perfect for R/C. The first event on the R/C program p t t / e m m (run to SAM rules) was the Texaco event. This was the very first time this event had ever been run in Australia, so everyone was pretty even when it came to being By JOHN POND better than his rival. John states several magnificent models were present. as he had only finished the model the the afternoon, making it difficult for the . Photo No. 2 bears this out amply, as night before. You couldn’t blame Les for lightly loaded models to maintain head­ the Shereshaw Cloud Cruiser by Bruce being reluctant to put in too much flying way. Les Gilbert did pluck up enough Knight is an extremely well-built model. until he had the model fully trimmed courage for this event to pick up third Bruce went on to prove that he not only out. It remained for Geoff Brown, flying place. builds gorgeous models but flies them to a Plecan Simplex, to finally take third On the free flight side of things, three win! It wasn’t until the last round of place. events were held: Vintage Wakefield, flights that the Miss America of Tidey The Old Timer R/C Limited Engine Vintage Power, and Old Timer Com­ finally caught up. Run event, also run to SAM rules, was bined Gas. For the benefit of the Ameri­ Les Gilbert was less fortunate with his pretty much a carbon copy for the first can readers, the English and the Austra­ big Lanzo Record Breaker (Photo No. 3), two places, as the wind came up late in lians classify Vintage models as those prior to December 1952. Old Timer classifications are the same as SAM rules; i.e., prior to December 1942. However, there appears to be some variation on the cutoff dates, as the Wakefield event was run on pre-1945 rules. Korda Wakefield models ruled the roost for spectacular flights and winning places, Art Butler and Barry Lee taking first and second respectively, with Neil Malloy using a Keilkraft Gypsy to win third. In that line, although he didn’t win. Photo No. 4 shows Angus Orchard with a rubber design known as “ Old Standby” (looks suspiciously like a Korda design). Photo No. 2. Beautiful building job on Bruce Knight’s Shereshaw Cloud Cruiser. Really motates This is a rather modern-looking design with O.S. .60. Australian O.T. Champs. as compared to Photo No. 5. which features the Australian model "Sky Rover Sr.,'' rebuilt by Max Starick. Max, incidentally, found this model in basket case shape and has done an absolutely impeccable job of restoring the model. Best part is that preliminary flights indicate the Rover is actually compe­ titive. Results of the Vintage Power event reveal that quite a few models were brought out of the cupboard, so to speak. These models, flown to lllawara Rules (as promulgated by Dave Owens), had to conform to the age limit of December 1952. This allowed quite a few postwar models to be entered, such as Slicker, Tomboy, Sugarfoot, etc. M ulti­ Photo No. 3. The ubiquitous Lanzo Record Breaker, this two-channel version built by Les ple entries were allowed, with the Gilbert. Flown in the Aussie O.T. Champs, Les finished it the night before the meet. unique ending in standings that gave

38 R/C MODEL BUILDER Photo No. 4. Korda-ish "Old Standby" was flown at the Aussie Nats by Angus Orchard.

able on ignition, but the engine was rather large and bulky. Worst of all, its Photo No. 5. An Australian design, the "Sky Rover Sr.," carefully restored by Max Starich, overall performance did not compen­ O.T. columnist for A irb o rn e , the model mag from Down Under. sate for the weight. Although a good engine in its day, it was simply out­ Dave Owens first with his Buzzard Model Craftsman magazine ran a classed by the Hornet and later the Bombshell and third with a Tomboy. The series of tests on all engines and found McCoy, in the speed circles. only one to prevent a complete shutout the Ken turned, on ignition, 5,650 rpm The Ken engine featured an “ over­ by Owens was Bruce Holmes, who took with a 14x8 propeller, 7,900 on a 14x6 square" ratio of bore/stroke, with the second place using an English design, a prop, 7,000 on a 13x8, and 9,700 on a 9x10 bore of .937 and stroke of .875. Model Slicker 42. prop. When compared to the contem­ Airplane News rated the motor at .60 The O.T. Power event suffered from porary speed king of the day, Ray Snow’s horsepower at 14,000 rpm (using a lack of official entries, as there were only “ Hornet,” the Ken motor suffered by flywheel). The Model Craftsman people four. Winners here were: 1st, Al Butter comparison, as the Hornet turned 13,650 reported 13,700 rpm utilizing a seven- (Simplex); 2nd, )ohn Tidey (Playboy); rpm on a 9x10 prop. ounce flywheel. Compare this with the 3rd, Bruce Holmes (Sugarfoot); and 4th, All tests, of course, were run on Hornet at 14,750 rpm . . . better than a Les Gilbert (Alpha Corsair). Photo No. 6 standard 3:1 mixes; hence, like in the 1,000 rpm difference! shows 4th placer Les with his Ed Beshar case of the Forster .29, the Ken probably Although the Ken engine did lend design. This tw in-rudder design is ran better on methanol. Actually, the itself to “ hopping up,” the competition gradually finding more and more accep­ performance obtained was quite credit­ for the motor market was just too rough tance in the free flight circles. )ohn Tidey completes his report by stating that all contestants thought the meet was nothing short of terrific. The field used for flying is simply out of this world, being two square kilometers of mowed grass. John says without a doubt it is the best field in the state. With such a field available and a definite competi­ tion set for next year employing the same events, there is no question that Old Timers are in Australia to stay. Great stuff! ENGINE OF THE MONTH In the August 1945 issue of Model Airplane News, a new engine appeared in the advertisements. This engine, the Ken .61, was aimed directly at the tremendous popularity of control line modeling. The Kencraft Co., located at 225 N. Seventh St., Garden Grove, California, featured this new racing engine at $32.50 less coil and condenser. Weight was given at 17.5 ounces but later charts indicate the motor weighed 15.5 ounces. Ken engines, when they first appeared in Southern California, were first tried in control line speed models. Even with their boasted “ turbo valve,” the per­ formance was somewhat disappointing. The factory brochure indicated the turbo valve, although rarely needing adjustment, should be looked at if performance was not up to par.

MARCH 1981 39 by eliminating the stall so prevalent in tractor models. Joe Culver won the Pacific Coast Indoor Eliminations easily and then went back to the A.M.L.A. National Championships to set a record of better than nine minutes, an unheard- of time! Once the ice was broken on tractors, records continued to be set every year. Later on, the wing was moved to a parasol position to gain more stability, as the low-wing versions did have the problem of spinning in under full- power winds. In the '40s, Joe Culver moved back East to take a job with Colt Mfg. Co. Seems like only yesterday that his son, Gene Culver, was out in California to go to the same college as Dad, Stanford University. The son was also interested in model airplanes and actually com­ peted at the Northern California Free P hoto No. 6. Les Gilbert also flew F/F with Flight Council meets. this Beshar design, the Alpha Corsair. If by chance Joe or some of his friends happen to read this column, we would and another engine passed into oblivion. be pleased to hear from you again. A.M.L.A. DAZE HO T STUFF AGAIN Photo No. 7 is one of those priceless This columnist is constantly amazed at pictures this columnist runs into every so the ideas that Bob Hunter ("Hot Stuff” often. In rummaging through the effects originator) keeps coming up with. In a of Earl Vivell (model engines, planes, recent note to this reporter, Bob says and equipment, first purchased by John you can get rid of that cloudy appear­ Grade, then sold off and the balance ance on canopies, windows, or wind­ acquired by Karl Carlson), looking for shields. Actually, the discoloration is old plans and information on antique caused by the curing fumes of the engines, this photo turned up. Recog­ cyanoacrylate glue. Up to now the nizing it immediately (Boy! Is this writer removal has been an unsolvable prob­ an old goat!), the photo was scheduled lem. for publication. However, Bob sez simply to put a drop The photo shows Joe Culver being of light oil (3-in-1 will do fine) on a piece congratulated by Junior Indoor winner of cotton or cloth, then pass lightly over Boyd Richardson. As can be seen, Boyd the area. Voila! The fog effect disappears Builder Plan No. 34781, $6) is not only a is holding the standard (for that time) immediately! Best part of the whole good-looking model but flies quite well. single stick indoor pusher that flew so process is that the discoloration does not Bruce sez he is going to take another well. Joe is holding a tractor, but note reappear. hard look at some of the old negatives that the rubber does not run the full Another neat idea is to coat the inside he has and perhaps, with a little mis­ length of the stick, as was common of a canopy, where you will never be sionary work, he can produce some practice on all indoor sticks whether able to get inside. Wipe the oil all over creditable pictures of thoseold Nationals they were pusher or tractor. The idea of the inside, then clean the bottom edge competitors. He often visits Ray Hunter, a tail boom revolutionized indoor flying with alcohol where the bonding occurs. the designer and manufacturer of the and made indoor tractors very practical After setting, you won't find any cloudi­ Hurricane motor, to reminisce about the ness inside the canopy! good old days. Photo No. 8 reveals that Bruce Lester, For those who are interested in what of 254 Glen Park Ave., Toronto, Ontario, Ray is doing these days, he is a ham radio Canada M6B 2E3, really is a first-class Continued on page 42 modeler. His "Tore” model (Model

Photo No. 7. Here's a real rare shot from the Earl Vivell collection. Joe Culver (right) con­ gratulates Pacific Coast Junior Indoor Champ, Boyd Richardson. Culver was the 1929 re­ gional A.M.L.A. winner and went on to set a Photo No. 8. Besides writing and photographing, Bruce Lester builds, too! He turned out this new indoor record. neat Old Timerish looking "Tore Trainer," from MB plans (No. 3478I, $6.00).

40 R/C MODEL BUILDER

Plug Sparks . . Continued from page 40 own back room, so to speak, where he offered Buccaneer plans for 50

Photo No. II. In response to our KGS plan in the Dec. '80 issue, dyed- in-the-wool free f lighter Ed Heyn submitted this photo of his KGS, Photo No. 12. Bill Hale, COFFC honcho, presents C.I.A. "Inform er" built in 1966 and still flying well. Only mod was for the stab DT. A editor Harry Murphy with a well-deserved birthday cake. good c o m p e titio n ship sez Ed. 42 R/C MODEL BUILDER SUPER BUCCANEER

FULL SIZE PLANS AVAILABLE - SEE PAGE 100 the same thing), far be it for me to say "Whoa” to the expansion of the SAM Not many fellows know it, but the Ken's latest editorial takes some of us movement. In fact, it has been the policy SCIFS (Southern California Ignition to task for developing larger member­ of this columnist to feel there is room for Fliers) club is actually SAM 3. This club is ships in O.T. activities. This writerwould all. More plainly put. "the more, the one of the pioneers in the Old Timer be the first to agree that this activity merrier." movement, flying strictly free flight wasn’t started with the idea of compet­ The latest contest report on the SCIF (with Taft as a site, what else?). ing with AMA, WAM, et al for members. Texaco Annual (first one I've missed in a Ken Sýkora, the editor of The Flight No question about it, the O.T. move­ long time!) indicates the weather was a Plug newsletter, is known nationally for ment began as an idea to get away from sticky 115° in October! No wonder the his sharp wit and penetrating observa­ highly formalized modeling and to again Easterners hate these contest reports. tions of the Old Timer movement. enjoy the building and flying of models, The most encouraging aspect of this Whether you agree with him or not, the particularly the oldies which seem to meet was the back-to-back win in Texa­ SCIF newsletter is well worth receiving. offer what everyone is looking for . . . co by the SCIF Junior, Jay Humelbaugh. You can get on the mailing list by plain out-and-out relaxed FUN!! He also won last year with the same sending $3.50 for a year to Ken Sýkora, However, with more and more people Trenton Terror, powered with (get this) 6716 Noble Ave.. Van Nuys, CA 91405. coming into the game (all in search of Continued on page 92

Photo No. 13. Chet Lanzo flew this R/C version of his old "Bom ber" Photo No. 14. Sten Persson holding a 1938 Swedish Wakefield model design at the 1980 Sam Champs in Ohio. Plans in the offing. called "Prim ." Designed by Sune Stark, 1952 World Wakefield Champ.

MARCH 1981 43 ELECTRIC POWER By MITCH POLING PHOTOS BY BOB KOPSKI

• There are very few contests for elec­ tric planes in the USA, and for the most part these have been all in California. Bob Kopski is not a person to be dis­ couraged by that, and he organized the first annual electricfun-flysponsoredby the Keystone R/C club in Hatfield, Pennsylvania. The fun-fly was held Sept. 28,1980, and even had an alternative rain date (Oct. 5). Such foresight is rare, and was rewarded with beautiful weather! This is a good illustration of Murphy's Law No. 100, which says to plan for things to go wrong, and sometimes they will go right. All electric R/C planes were welcome: scale, sport, aerobatic, old timer, motorglider.you name it! The event was intended to promote electric flying, with awards for the best-looking All of the 24 electrics that participated in the recent electric fun-fly thrown by the Keystone plane, the longest flight time, most R/C Club in Hatfield, PA. Quite a turnout for a first-tim e meet! aerobatic, and a surprise award. Bob sent me an excellent account, so I’ll among them, and several other mem­ the interesting things about them. quote his report: bers who are building. Electric is con­ John Henderson’s motorglider design There were 24 electrics flown, and the tagious! Three years ago there was only is quite attractive, and I like the take- weather was beautiful. While most ME! We are planning an Electric Fun-Fly apart features: it fits in the suitcase in the planes shown belonged to KRC mem­ for next year and III fill you in as plans photo! I agree with John that this is the bers, there was great interest among the develop. way to go, as I do a lot of traveling, many RC'ers who showed up as spec­ Thanks, Bob, for such a good report. including to Alaska. California, and tators. There is no question that they will There is no question that someone with Europe, and I always take along an return as fliers next year. Interestingly enthusiasm and drive like Bob can make electric. I always fly on commercial enough, a number of spectators said a success of an event. I think that the airlines, and my planes go in with the they had electrics but felt reluctant to KRC meet was a first in the USA. in that it conventional luggage or in a bag that fits bring them! What regrets! The event was the first sponsored by a club. Up till under the airline seat. This would be was basically a fun-fly with casual com­ now all meets have been sponsored by impossible without the take-apart fea­ petition no pressure and nice prizes, the model magazines, Astro Flight, and ture. and the convenience is fantastic, the latter courtesy of many folks in the IMS. So,the KRC meet has made history! with no hassle about odd and oversize hobby industry. Let’s take a look at some of the planes in boxes, luggage.etc. The planes areevery The KRC members (lew for fun but the photos that John sent, and some of bit as strong as the conventional con- not for prizes. Guest flier winners are as follows: BEST-LOOKING MODEL 1) lohn Henderson (Original design motorglider) 2) Austin Gutman (Yellow Jacket) 3) Aurthur Garzon (Sweet Stik) MOST AEROBATIC 1) Aurthur Garzon (Sweet Stik) 2) Austin Gutman (Yellow Jacket) 3) John Henderson (Motorglider) LONGEST FLIGHT TIME 1) John Henderson (Motorglider) 2) Aurthur Garzon (Sweet Stik) 3) Austin Gutman (Yellow Jacket) Obviously these three cleaned up. but there should be plenty of competition next year. I believe electric is only in its "seed" stage and that the next decade will see electric dominate. Interestingly enough, many KRC members who have no interest in electric worked all day as judges, etc It was an absolute success in the FUN DEPT.!! These guys who are specialists in pattern, helicopters, etc. pitched right in and helped hard all day. Of course, there is a high percentage of Very clever and good-looking electric sailplane by John Henderson. Plane folds, bends, breaks KRC members who are electric fliers. . . down, unplugs and fits in the carrying case shown, along with Tx and field gear. From left about 14, who have at least 22 planes are Heinz Koerner, Gene Hall, John Henderson, and Ed Milburn.

44 R/C MODEL BUILDER Bill Jones of KRC looking out over Bob Kopski's fleet. On the left is Only crash of the day was Heinz Koerner's powerful aerobatic model, the 075-powered "Euphoria" aerobatic ship, a semi-scale J-3 w ith powered by an Astro 075 on ten cells. 7X6 prop. Wing folded on a Astro 15, an original design powered glider called "Whisper V ," and snap roll. Behind Heinz is a four engine 020 ship, an Astro 25 Silent Bob's PR model, the "Friendly One." on the right. Squire (rear), and twin 05 W indrifter.

struction. and repairs are easy . . . just but I would guesstimate a six-ft. span flight. I have had many people ask if it take off the damaged piece and replace and four lbs. flying weight. Heinz also was, since it is a good design, easy to it or repair it separately. That is a whole has a twin Astro 05 Windrifter, and an build, and is nicely priced. I just haven’t lot simpler than wrestling with the Astro 25 powered Silent Squire (in the had time to try it. Bob says that the Soar whole plane to make a repair! Come to photo background). Ihaveoftenthought Birdi and the Astro 075 is an excellent think of it. a column on how to make of the Silent Squire as an electric, as it is a combination, and that there are several airplanes come apart (deliberately) very sleek and capable slope soaring in the KRC club, both with conventional might be a good idea. design for aerobatics, but haven’t got and "V ” tails. Bob Kopski’s "Friendly One” looks ” aroundtuit.” It must be plenty hot with The next contest I will report on is the really good, using an Astro 10and 1.2 Ah an Astro 25; I would guess about five IMS Show, on January 10 and 11. in cells for long flights (eight minutes lbs. all-up on the four-square-foot area Pasadena. California. This show w ill motor run). Bob lets spectators fly it for wing. I have been doing a lot of flying feature indoor electric scale, with cate­ fun and good public relations. It looks lately with the Astro 25andam impressed gories for monoplanes, multiwings, and a little bit like a senior version of the 05 with its power and long flight times blimps. I have been building an entry, a Astro Sport kitted by Astro Flight. If the (eight to ten minutes, depending on the Sopwith Tabloid, which will meet the looks are any indication, it must be an aerobatics). rules of 24 ounces max and three ounces excellent flier. The "Euphoria” Astro 075 Some of the photos show the clever per square foot max. This has turned out aerobatic plane looks good too. I don’t cooling fans the KRC fliers use to keep to be a challenge, but quite possible and know if Bob has drawn up plans for the battery packs cool during charging. fun, too. I decided to build it the same these. These are neat, and a sure way to get way as the real one. with light structure I don’t usually show crash pictures . . . spectator attention. I’m sure! Since I live and wire bracing (thread). The result is after all, electrics never crash (I wish!), in the cool and wet Pacific Northwest, I nearly scale, and a structure weight but Heinz Koerner’s planes are so haven’t needed any cooling fans, but I including landing gear of six ounces interesting that I just have to. The remember a Boy Scout Jamboree I before covering, for a 50-inch span and crashed plane is (was) his aerobatic Astro attended in Valley Forge, Pennsylvania, 7-1/2 square feet wing area. The all-up 075 model, using 10 cells and a 7x6 nylon way back when, and it was scorching in flying weight will be between 20 to 22 prop. It is his design, and is a powerful July. I can see why the KRC fellows ounces with an Astro 020 and Cannon flier, but the wing folded on a snap roll. would use them. Super-Mini radio. A few years ago I I’m sure Heinz will have a new one in the One of the photos shows John wouldn’t have thought this possible. The air by now! Just behind Heinz is his Hickey’s Bridi Soar Birdi flying over the neat thing about electrics is that there is original four-motor Astro 020 plane, field. At last, I can tell people that the always something new, and always a which flies well. No specs were given. Soar Birdi is a good plane for electric challenge. See you at the IMS Show! ·

Neat cooling system on Bob Kopski's Astro 15 model. Worn-out 075 Cooling system on Kopski's J-3 Cub. This one uses a Chrysler window motor blows cooling air into battery air scoop (not visible) following washer motor w ith Cox 3X1-1/4 (.010) prop. Clever idea, especially a flight and/or during charge. in warmer climes.

MARCH 1981 45 One-half of the "Powers That Be" at Flyline Models, Hurst Bowers (the other half is Herb Clukey), turned out this unusual Polikarpov PO-2 Russian/I2 m ilitary biplane. It'sA R/C, w ith& three channels sporr operating rudder, elevators, and throttle. scene By LARRY RENGER p h o t o s b y a u t h o r

• I received a long letter from Larry Mile tionedthe Jetco “ Shark .15,” the"Junior tion of factors he used to design and of Mission, Kansas. He is an enthusiastic Flite Streak” by Top Flite, and the build successful racing planes: advocate of the .19 size engine, and the "Akromaster" by Sig. To Larry’s way of Didn’t know you were going to print Fox .19 in particular. I can only quote thinking, the .19 size sport U/C is an my letter. My first 1/2A reed-valve racers from a few pertinent sections due to the ideal entry point for new modelers to a few years ago were about the most overall length of his letter: get started. They needn’t deal with the unstable, hard-to-fly planes around, and Modelers do every trick they are comparatively delicate 1/2A models, I didn’t know what was wrong. I thought capable of to keep their planes as light as nor handle the behemoths that a .35 all 1/2A’s were that way, and there was possible, then frequently stick a power- requires. Sadly, there are not enough nothing that could be done. Then in plant up front that is heavier than need kits available to make this convenient. 1978 I accidentally found a combination be. In addition to the fact of low initial A few months ago I had a letter from that really works. Since then my pilot, cash, long life, reliability, and avail­ George Lieb, in which he mentioned Mike Doran, and myself have built a ability of parts, Fox engines as a whole that he had lots of trouble with 1/2A bunch of 1/2A’s that all have certain are oftentimes ounces less weight than U/C models until he learned a few tricks features in common and fly great. Even competitive brands, a big plus for Mr. of the trade. Happily, George recently though we didn’t win (took 2nd and 3rd Fox’s engines. wrote again to pass along the combina­ in Open), our planes flew as well as The only feature I have not liked about my Fox .79 C/L engines has been the rather spindly needle valve that is subject to vibration and is easily broken in the event of a crash. I have solved that problem by using the Fox needle valve assy. No. 74070 that is used on the.40 size engines and larger. Since the spray bar on this needle valve is longer than the one the .79 is supplied with, I use a couple of thick fiber washers or alu­ minum spacers to secure the spray bar. I also cut off the top half of the needle valve to produce a compact needle similar to the one used by the last World Champs Russian Combat Team. Larry goes on to suggest that the engine would be a good choice for sport racing events. He also talks about the possibility for starting up an R/C Carrier event. The remainder of the letter deals with the fact that although there are a fair number of radio kits for the .19 size engine, there are really none in C/L. You can fly a few .15 size models very well with a .19 ... Larry particularly men- 46 R/C MODEL BUILDER anything at the '79 Lincoln Nats. Lots of planes crashed there because of wind. We really didn't think it was too bad. Mike even did wheel touches and taxied for laps at full speed when his race was over. Our planes have lots of line tension on takeoff and in flight. They fly very level, and are barely affected by wind. We have flown in winds greater than 30 mph, and he can always whip them back to the pits. We’ve had no crashes since 1978. The Klause " Lil Rodent"also flies very well. Here's the setup we use on all our 1/2A’s: symmetrical wing airfoil (gives very little climbing in wind); wing as close to center-line as possible (high-wing planes tend to have Here's one we would have liked to see fly . ·. and it reportedly flew very well. It's a 1913 Etrich less line tension); leadouts are swept Taube, constructed by Greg Davis of Canada. Flew at Flightmasters Annual. forward to exit just behind the leading edge and the plane balanced so that is about 20% of the stab area. Judging engine problems that I would guess when suspended by the leadouts, it from the short nose moments and the were due to overheating. I saw at least hangs with the fuselage level. If the CG location George specified, the one good flight with the model, but later leading edge is swept back, leadouts are models must be very lightly built. in the day I noticed that it had been either right on the leading edge or On to the models for the month! First crashed, though it looked repairable. slightly in front. up is the "Red Tailed Duck,” a canard Ralph builds very clean models, and if I We use the Si g 1/2A bellcrank and free flight by Jim McDermoth. I have remember correctly, he said this one control horn, 2-1/8 inches between watched this model fly and it is a very only weighed seven ounces. leadouts, 1/2-inch elevator horn. The nice, docile sport model. Jim has used Last airplane for the month was not at pushrod is in the inner bellcrank hole Jedelsky construction on the wing and the contest. It is a Russian PO-2, built by and outer horn hole. The horn is stab for an all-wood model. Power is Hurst Bowers. Span is 48 inches and the mounted on top of the elevator. No provided by a Tee Dee .020, and the high model flies on three channels with a .15 braces are used on the pushrod, so the engine position keeps the engine clean, in the engine compartment. In case you controls are extra free; as racers don’t fly allows reasonable control of CG posi­ can’t spot it, the engine is mounted inverted, this causes no problems. We tion, and controls any tendency to zoom inverted and looks to me as if it might be always fly with a handle with about two- under power. Continued on page 83 inch line spacing. The Sullivan handle At the Flightmaster’s Annual a few (looks like a letter "D.” LHR) with the months ago I got pictures of some top cable in the center holes works great. drawer scale models. Greg Davis came This gives very insensitive controls and all the way down from Canada to fly his makes them fly very smoothly. Our 3/32- beautiful Taube. The model was scratch inch landing gear wire does not bend built from factory plans and powered by easily, and allows fast landings without the Mills .75 (cc) diesel replica which is the plane springing back up again. We currently being imported from India. always use reverse pitch props, which The model weighs about 15 ounces and gives excellent line tension on takeoff. It spans 56 inches. Covering was silkspan, does limit the choice of props, but we carefully stained to resemble fabric. The like the security during the heat of a wheels were shock mounted in the race. identical manner as the real aircraft. Oh Now, that is what I would call a meaty yes, the model flew very well. letter. George is right-on about getting Ralph Cooke is holding his version of those control sensitivities reduced. just about everybody’s favorite warbird, Most people put much more control the Corsair. He built this one from the action in a small model (C/L or R/C) Guillows kit and put a Tee Dee .020 in it. than they would dream of in a large Since he was swinging a large prop, and House of Balsa's "Tuf-G rind" wheels w ill take one, and then they complain that small the engine was cowled, he had some a reel beating without coming apart. models are "squirrely." The trick is to look at the angles of control surface throw, not the measured deflection in inches. For example, 1/8-inch of throw on a Pattern .60 model aileron reduces to about 3/64 of an inch on an .049 model with ailerons of about 1/3 the chord of those on the big model. On C/L ships you have to compensate for the smaller bellcrank linespacing by moving the spacing in on your handle the same amount. Quite frankly, I usually have a problem getting the sensitivities low enough on most models! George also sent a photograph of two of his models. I’d love to print them but they are Polaroid color and won’t reproduce. He uses a very long tail moment, about three wing chords, and the stab looks to Sport F/F is alive and well in Los Angeles; Jim McDermoth's "Red Tailed Duck" is just one be about 30% of the wing. Elevator area example. All-wood model uses Jedelsky construction on the wing and stab.

MARCH 1981 47 As for the pitch, you can use the Muck Pitch Gauge to determine the pitch of any prop. Here’s how it works. The difference in length between pin A and pin B on the back side of the gauge block is measured with the accompanying preset scale; you just hold the scale up to the pin and it tells you the pitch in inches. You need no conversion charts, nor do you have to do any type of figuring. The gauge is so easy to use that no one should have any problems at all. Once you have checked one blade of your prop, you can rotate the prop and check the other blade (or blades) to insure that each blade has the same pitch. This will let you adjust each blade to the same pitch for perfect alignment. The gauge will work on props with two or more blades, large or small. It also lets PRODUCTS IN USE you check the leading and trailing edges to insure that one blade isn’t forward or STEVE MUCK'S PROP PITCH GAUGE, by AL BERRY backward a little in relation to the other one. You can even check the individual PHOTOS BY AUTHOR blade length. This will show you if the prop has one blade longer or shorter • What’s your prop's pitch? Are you water is not a completely solid sub­ than the other. sure? If not, check it out with the simple stance, and we do have a lot of slippage. All in all, the Steve Muck Pitch Gauge and easy-to-use new prop pitch gauge You can obtain a theoretical speed in will do everything that any boater from Steve Muck’s R/C Boats. miles per hour with the following should ever want . . . that is, as far as To start, let’s define the word "pitch.” formula: checking the prop goes. If you would Pitch is the theoretical distance that a like one and your local hobby shop is prop would travel in a solid substance _ rpm X prop pitch in inches out, drop Steve a line at 6003 Daven (with no slippage) after making one Oaks Dr., Dallas, TX 75248, or phone complete revolution. As you know. 1056 (214) 661-1572. ·

The Muck Pitch Gauge features steel pins in an aluminum block; the pins can be adjusted to the prop blade, and once set (left), you simply hold the attached preset scale up to the pin and take a direct reading of the prop's pitch (right). Quick and easy to do.

You can also check the runout of each blade Checking the front and back prop edges for The gauge works on any and all props, regard­ to assure they are the same diameter. true alignment. less o f size, shape, o r nu m ber o f blades.

48 R/C MODEL BUILDER AND f£EE_FUfiHr ^ Q W T R O L 55 50 54 63 56 This nostalgic photo, suppliod by Pete Westburg, shows a Pan American Airways Sikorsky S-42B, flying in a westerly direction over the unfinished toGolden survey Gate its in Bridge. Pacificlate As 1934routes the orbridge tw early o wasyears not1935. prior finished Anyone to opening care and to passengeropened narrow service until init 1937,down?May, it's1937, pretty and Pan safeAm to was estimate using operational this photo equipment as having been taken ......

-6 HANDLEY PAGE 0/400 HANNAN'S HANGARFREE FLIGHT SC ALE FREE FLIG HT P E A N U T " V I R I " ...... 51 C O N T R O L SIG L " I T N W E I ...... 60 S T E R " ...... 62 W A C O Y Q C

MARCH 1981 (Ο Our columnist hasn't been the same since his balloon ride w ith lady aeronaut extraordinaire, • The above quotation, by W. James, this time as a television movie. We must Linda Price. must have been taken seriously by conclude, after seeing both, that time Howard Hughes, who managed to do has been far kinder totheaircraftthanto grace and cleanliness. Except for the •just that: the film! massive flap hinge fairings, it would be COMING OUT PARTY We were in Long Beach a few days difficult to fault a single feature from an The fabled Hughes flying boat, hidden after the flying boat was exposed and "eyeball engineering" standpoint. in a drydock hangar since 1947, has at last managed to see it, even if only from a Wash-out is clearly evident in the wing emerged, having successfully escaped distance. A large bridge with a pedes­ panels, and all-in-all the craft has a "just the totally ludicrous idea of beingcutup trian walkway offers a good vantage right” look about it. We eagerly look into fragments. Television coverage of point if one is willing to do a bit of forward to viewing it at closer range. the event was lavish, and depicted hiking, and we felt it well worth the Meanwhile, we’re told that TWO R/C invited guests sipping champagne while effort. Judging from the crowds, so did models of it are ready for flight testing! listening to the lyrics of a song “ The many others! Apparently most were not PROGRESS IN PEANUTS Spruce Goose is Alive and Well," as aviation enthusiasts, but merely curiosity At the opposite end of the scale, Hans some hundred workers and an equal seekers. Justus M eier, distinguished German number of public relations people The aircraft appears rather cream- model builder/author, offers his reac­ attended to their respective functions. colored overall, rather than the antici­ tion to Peanut Scale: "It is in this field The enormous bird was towed by tug­ pated silver, but perhaps the late after­ that progress in model aviation is shown boats about 300 yards, then hoisted noon sun contributed to the illusion. in true perspective: the same old rubber onto a cradle where it is expected to The propellers have been removed and strands, the same materials, the same remain for some months while a suitable the engine cowlings are wrapped in subjects as thirty years ago, yet what display facility near the Queen Mary is shrouds. Most impressive is the vertical wonderful performances are achieved prepared. tail jutting some 80 feet into the a ir.. . with them, where earlier types were By coincidence perhaps, another certainly there could be no directional almost unable to fly." Howard Hughes project, "The Outlaw,” stability problems with this one! Continued on page 72 starri ng Ja ne Russell, has also reappeared, The total effect is one of remarkable

At last, the Spruce Goose comes out! Compere its size to that of the docked ship. Props have been removed and the engines covered. The craft was form erly located in the structure behind it in the background. Photo taken by Bruce Carmichael.

50 R/C MODEL BUILDER

Waco and and ro duction s, o n ly 1 0 0 to 150 o f these k its w ere made, and a fte r tw o years o f research, Ms. M o rris believes hers, w h ic h was bo u g h t b y her fa th e r r e th fa her y b t h g u bo was h ic h w hers, believes rris o M Ms. research, f o years o tw r fte a and made, ere w its k these f o 150 to 0 0 1 ly n o s, duction ro Our Our

ee k, a b he y oe iski n xsec. h pasaes l eald n r oacrt i outi a imed by . y b d e firm n o c (as e tlin u o in accurate so are and detailed, ll e w so are plans The existence. in d in k its f o one ly n o e th be may , lk u b never FULL SIZE PLANS AVAILABLE - SEE PAGE 100 ist let Pa ort ye oe o u wa vaton etuis Caoln ri,Whro. e esy Te dl sa 4" /4 3 a is odel m The Jersey. New harton. W orris, M lyn aro C enthusiast n tio avia f o ay w y b us to comes yeer e th r fo Plan r ollecto C t firs QC- YQ nn fit I t ■ « · · |j Ij I1 < 0 i || \r ! · L j i 1 1 N| e f 6 V m C , produced b y th e Skym asters C orp. o f C in c in n a ti, O h io , between 1936 and 1940. A c c o rd in g to Joe F itz g ib b o n , o f G olden Age Rep Rep Age olden G f o , n o b ib g itz F Joe to g in rd o c c A 1940. and 1936 between , io h O ti, a n in c in C f o orp. C asters Skym e th y b produced , fc TT \i i Í i ° h ^ LJ o .371 ------PPPPP PPPPP \ i! i , f i IV a 111 a i 1! ■*\ *: _ = ! r - ! ! ii-|- S ll L—t# M lil 1 j— 1 : 1 \dH.U m fV s' . cJ^n =i iij iij t f il ή \j| *..i Ä Ic k r 13 pryr) =£ r= I i VI — ΪΙ U~v_ Pi 1LPi \ 7 Ί " Ί 5- ) . V „ S J/ / p Ϊ Ξ Ι - L L b t * ft Is f * W, o··;· , r* !W Ifå |! in l|i! ft ^Tj Rf-t. 1ÍS.I , It? f I £ i - B l d 531 77 — N ; . i ill!.fi, i M il! i [ D 3iB ij t í í í t !Α « *ί ι ίφ !* i!i l iu iii! C3T /S f I PHOTOS BY AUTHOR

By Bl LL DENNIS . . . Multi-engine gas scale models are a rare sight these days; here's one that really per­ forms, and consistently. Won the '78 and '79 British Nats, was 2nd at the '78 World Scale Championships.

• In 1972-73, one of England's foremost When I decided to have a go at a twin been made, mostly over rough terrain, scale experts, Terry Manley, was experi­ I discussed these problems with Terry, and the model has won three out of the menting with twin-engined F/F scale the main result being that on my model I four contests in which it has been models. The first was a Vickers Vimy of fixed the two outer rudders, which are in entered, including the 1978 and 1979 55-inch span, which I did not see fly, and the slipstream and hence have a great British National Championships. then an ΗP 0/400. Terry entered this effect if moved, and used the central fin Construction should present few model at the 1973 British National to adjust turn. This seems to have done problems to the reasonably experienced Championships and it greatly impressed the trick as the aircraft flew straight away modeler. Flying performance makes the all who saw it. It was, however, a bit of a with no trimming necessary, and is effort worthwhile and is extremely handful, being very sensitive to turn extremely stable. Large size and light satisfying, especially when the model trim, and would not take off reliably, wing loading also help in this direction. circles overhead with the engines run­ usually necessitating a hand launch. Approximately 50 successful flights have ning in unison. It goes without saying, of course, that the engine cut-out system must work every time, because if just one engine stops a crash is inevitable. For this reason I would not recommend the model to that breed of scale modeler who suffers great anxiety when his masterpiece is anywhere but in its box. However, once the systems are working properly, it is as easy to handle as any single-engined aircraft. In the following construction notes I intend to highlight only those areas which may differ from standard tech­ niques. The main structural members are from spruce, and the wings are located on wire dowels in brass tubes, giving a very strong and flexible struc­ ture. It is most important to keep a constant eye on the weight; the original weighs 38 oz. A low wing loading results in a low flying speed and hence low inertia when landing. The main areas to watch in wood selection are wing ribs, tail 56 R/C MODEL BUILDER Here you can get an idea of the type of construction involved; not overly difficult, there just happens to be a lot of it. Wing center sections are permanently affixed to the fuselage, outer panels are removable for transport. surfaces, and fuselage cross members. The wing can now be lifted, the gluing members and diagonals. The sides are The first essential step is to obtain two of the ribs completed and tips, hooks, then easily assembled inverted over the diesel engines (preferably Mills .75's) tubes, etc. added. The rigging wires will plan, due to the straight top edge. The which can be relied on to maintain eventually be looped over the outer nose is constructed from 1/8 sheet and constant revolutions for minutes on end strut hook, pass through the tube on the the two formers, but do not add the and run at the same speed. inboard hook, and be attached to the timer platform until later, as the engine WINGS center section by small rubber bands. nacelle jigs pass through at this point. Prepare the trailing edges from the Thus, each wire acts as a lift wire in one Add some internal reinforcement where best, stiffest 1/8 sheet you can find and bay and a landing wire in the other. the nose section joins the main fuselage slot them 1/16 deep for the ribs. Pin the Make the holes for the wing joining at F3. trailing edge and appropriate spar tubes slightly oversize and glue them in TAIL SURFACES packing onto the plan. The ribs are place with the wing panels jigged up to The outline shape is cut from stiff but threaded onto the two main spars, the required 4° dihedral against the light 1/32 sheet, and the rib positions which should already have small holes center section, using the wire rods to marked on each side. This is then pinned drilled to accept the strut hooks. The join them. down and the 1/16 x 3/32 ribs and 1/16 whole assembly is pinned down over the FUSELAGE sq. outlines added to each side in turn. It spar packing, glued only at the trailing The covering of the fuselage is sup­ is a good idea to file a 1/32-inch notch in edge. When tne ribs have been posi­ ported away from the cross members by the tailplane/elevator spars to accept tioned in their correct stations, spot glue 1/32 X 1/8 balsa strips glued onto the the aluminum hinges. them to the spars with white glue from a longerons, and by 1/32 sheet at the The whole structure is then sanded to syringe. Add the leading edge and the extreme nose and tail. Window frames, an airfoil section, and it is possible to get 1/8 X 1/16 spruce top spar; the function etc. also have to be built up 1/32 of an quite a sharp edge on the spruce strips of the latter is to resist unwanted curved inch to maintain this depth. used. The lower tailplane passes through dihedral after covering. It lies 1/16 of an Side frames are constructed up to the fuselage, then elevators are added. inch below the surface. former F3, using light wood for all cross The tail is assembled after covering, ensuring correct alignment of the outer rudders (parallel to fuselage axis) and tailplane incidence (both 0°). CENTER SECTION This is probably the most difficult part of the model; correct alignment is essential. A recent bad landing on rough ground necessitated a complete rebuild of this area, during the course of which I managed to rig the upper starboard wing with more incidence than the port. As a result, the model is now more difficult to trim for correct turn, needing large quantities (like 45°!) of rudder offset. Assembly begins with the attachment of the lower center section to the fuselage, in which two slots of appro­ priate depth must be sawn for the main spars (the leading and trailing edges are removed in this area). Note that the front main spar is doubled up to with­ stand landing loads. The basic engine nacelle structure is Plans on next two pages. Article continued on page 76

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53 R/C MODEL BUILDER

PHOTOS BY CHARLIE JOHNSON

Myles Lawrence about to launch for Steve Hills at W hittier Narrows, The insides of Gator Perkins' FAI Team Racer, flown at the 1980 a popular Combat site in So. Cal. Nats.

ontrol line By "DIRTY DAN" RUTHERFORD

BLADDER GRABBER ’80 well. The motor was humming, but that win match after match. However, if For regula r readers of the C/L column, isn't really a big factor as it isn’t that hard something really serious happens, such even those who aren't so regular but for experienced fliers to come up with a as having to use a borrowed model, or if have been reading this column through runner in the way of motors. things all go so well that there is nothing the years anyway, the words "Bladder But it was more than that . . . “ that” to do but stand around and worry, then Grabber” have come to be associated being a working motor/model com­ Howard can, and will, get so nervous with a yearly Combat meet that is very bination. Howard is one of those people that he giggles and actually shakes! competitive and features big-bucks who function best in a situation where That didn’t happen at this year's BG. stereo equipment for prizes. What the the really important things, model and The model lasted through the day, uninitiated think of when first coming motor, are there and ready to go, no finally getting severely bent in a mid-air across the words "Bladder Grabber,” worries as to their performance. Yet he with Neal White’s model almost im­ especially when they realize it has some­ seems to need a bit of disarray around mediately after Howard had won the thing to do with a toy airplane contest, is him . . . plugs still in packages, fuel final match with a clean kill on Neal. By one of those things that makes writing "someplace,” chicken stick lost half the the time this match was over Howard did about C/L a bit of monthly fun, even time and, most importantly, being just a finally go a little crazy, but I think he said after all these years.. . little behind the schedule most of the something about that model having Anyway, the Bladder Grabber is in­ time. In this atmosphere he can hold at gone through ten or eleven tough deed a biggie in the world of C/L a certain level of excitement, nervous­ matches, against very good competition, Combat flying, and for BG ’80, Bob ness, whatever you want to call it, and all with the only damage being a broken Carver, now with the Carver Corpora­ Y&O prop plus a bunch of string cuts in tion, donated over $2700 worth of high- the leading edge of the foam model. The zoot stereo stuff for the top three places. string cuts came from getting kills, of For those who don’t already know. Bob course, and only require a bit of tape to started the Phase Linear company, used repair, so really can’t be regarded as to donate theirstuff, and now hasstarted damage. In addition to the matches the Carver Corporation. The tradition flown with this model, Howard no doubt continues, just different sponsorship. turned in quite a few flights just show- At BG ’80. from the first few rounds bizzing, so he was dialed into it like you on, it was obvious that Howard Rush had can’t believe. everything going his way. Combat meets Neal White came through with his are always difficult, if not impossible, to best-ever showing at a BG, having been predict accurately, especially when at most, maybe even all of the previous there are a goodly number of top-notch meets. Neal is one of the most consis­ fliers at a meet. But by the fourth round tently laid-back Combat fliers around, or so, which is about halfway through a just takes things as they come along. typical BG, nobody was betting against Even a bit of bad luck or a suspect call Howard. Personally, I was hedging my only gets at most a shrug from Neal. This bet, feeling that if Howard could man­ year he didn’t do much shrugging. He age to keep his one really good model in lost only to Howard in early rounds, one piece, he just simply could not be losing again in the final match. Only beaten on that particular day. The model thing that bothers me at all about Neal is was working really well. It wasn’t the Gil Reedy Points out the kill that ace flier and that he still flies them funny airplanes type of machine that I like to fly, but it photographer Charlie Johnson scored w ith Phil that don’t have a straight line in any did suit Howard and his style extremely Cartier's plane. direction. For those with faulty memory

60 R/C MODEL BUILDER banks, Neal designed and had published motors, a couple of Fox Combat Spe­ in American Modeler the "Bosta," one cials mixed in with the odd Tigre or of the most difficult to build and trim three. Some go so far as to even have Combat designs known to man. Even different fuel systems, pacifiers here, covers them in silk, if you can imagine bladders there; in the worst cases, that... bladders of different materials are used. Mike Petri, who had come in first in If the goal is to lose early, having a varied the 79 version of the BG, ended up in assemblage of equipment is certainly third on a gift flight. Actually it wasn’t a the way to go. flight at all; Mike and Bob Carver were Yes, I can think of a couple of times to fly for third, but Bob conceded the where contests were won using a grab- match . .. something about not needing bag approach, right down to borrowing to prove he could beat Mike and what models, but these are only the odd was he going to do with a piece of stereo cases. The chances of doing it contest equipment that he had already donated after contest are very, very slim. to the cause? As I recall, Mike's version The most recent example of using of the story was just slightly different, consistent equipment to win with is the still he toted off his prize, grinning all the contest just mentioned, the '80 Bladder way. And, in case you wonder, Mike and Grabber. Rush had just the one really I are friends. super model (at least as far as I know; it is Still, just to put the friendship into a always hard to tell what he might have strained relationship, I can't resist men­ stashed away in his car), but it didn’t tioning that as Mike went to the circle, get bent until the contest was over. That already down with one loss and due up lone model was enough. Now that it is against Neal White, the last thing he gone, or at least damaged enough that said to me was, “ No problem. I’ve never Jed Kusik piloting .. . wait a minute, no won­ even if fixed will probably never be 100% lost to Neal." True then, yes, but no der they lost in Poland, the pit man's supposed like it was, it will be interesting to see if more, right, Mike? to wear th e fu e le r! the basic design and construction tech­ During the meet there were some niques are good enough that every really super matches, which is common Howard Rush second, Myles Lawrence model off the board flies as well. My at Bladder Grabbers. One of the best was third, and Neal White fourth. In Ad- guess is that it w ill be d ifficu lt for Mike Petri against Bill Varner; five full vanced/Expert Stunt, Paul Walker was Howard, or anybody else for that matter, minutes of Combat, only one cut each first, Bob Emmett second. Max Thue to build tapered planform Combat and Mike took it on airtime. Best mid-air third. Beginner/lntermediate was won models that are super-consistent. was between Stanley Youngblood and by Tom Webb, Mike Bogan was second, Brasher’s Rotation Stations in foam have Bob Carver. Both models blew up in a Jim Fuller third. been outstanding in performance and of huge way . .. nothing really unusual as WINNING WITH CONSISTENCY course they use tapered panels, but far as Combat meets go, but you should That lead-in is misleading, I am afraid, even Rich has had good and not-so- know that Bob’s model was a Rotation as it isn’t meant to refer to winning good models, with an odd one or two Station in balsa, built by Gene Pape to consistently, although that is the goal. coming out poorly for some reason or very high standards of workmanship and Instead, it refers to using consistency as a another. The trick here was that Brasher costing Bob $100 per model. A hunnert tool in trying to win. would build more than enough models, bucks to you and I, just another model First, think back to contests you have using the best in contests and grudge­ out of a stack of them to Bob. I have a attended, and to make the point easier, matching with the others. little trouble relating to that, but then it we will deal specifically with Combat I have never tried the tapered models, is all relative, I suppose... meets. If you will recall, the winners at mainly because they are more trouble to In the past few years, the BG has been most meets have a fleet of identical build, when all efforts are being made to preceeded, on Saturday, with rather models. Many of the losers cart out a make my models as easy to build as casually flown events. This year there mixed bag . . . some wooden models a possible. Another big aspect is this was FAI Combat and Stunt. In FAI foamie or two . . . some are so out of it sneaky suspicion that tapered models Combat, Stanley Youngblood was first. that they may even have different are simply not as consistent in flying characteristics as rectangular, constant- chord models. So, even though my own Combat models, the Plastic Nasty design at least, may be very large and in some cases ugly to boot, they do combine good performance with ease of con­ struction, but most important of all, the models fly identically. And so as you are now seriously thinking about building new equipment for the coming Combat season, keep the consistency thing in mind, build a bunch of models, all of the same design, fly the tar out of them and you’ll be ready to win more matches then ever before. ENGINE REWORK Every so often a note or card comes floating across my desk, and that wafting piece of paper will likely as not be touting the sender as an engine rework artist. Send money and I’ll make you a winner. Let me know how fast you want to go and I’ll tell you what it’ll cost. Eighty zillion rpm and 15-plus hp from Deadly-looking Slow Combat ship w ith l-o-o-o-ng tail moment, seen at the '80 Nats. Note the interesting glow plug primer installed . . . the very latest in trick equipment. Continued on page 76

MARCH 1981 61 • For the modeler who is new to the field, or the old-time hobbyist who has gotten too short of wind and long of tooth to chase his free flights or carry an eight-pound, super-zoot, fourteen- channel R/C pattern ship around, may we make a modest suggestion? Instead of making your next project the same as the last ship, why not take a break and put together an airplane which is simple to build and maintain, flies slowly and smoothly enough for the beginner, and yet is responsive enough to satisfy all but the most discriminating of fliers? Of course, we are referring to Sig's "Twister," a control line stunt ship, designed by Mike Stott to have just exactly these characteristics. This well-engineered and packaged kit is one of the best values on the PHOTOS BY CRAIG FOXGARD market, and will require only a small dip into the extra cash reserve you keep in the back of your wallet that the wife doesn’t know about. The outside label lists all the extra goodies you’ll need to complete the airplane, and the whole purchase price of these items won't add up to the cost of the balsa alone in the PRODUCTS IN USE kit! If your experience with models con­ SIG'S "TWISTER” C/L STUNTER, by JEAN ANDREWS sists of a few small U/C models and one or more of the plastic ready-to-fly’s. the motor in fairly good shape, go ahead a friend who felt sorry for us in our size of this ship may be intimidating. If and spring for a new Enya, Fox. O.S., venture. you’ve been building F/F or R/C types Super Tigre, or whatever other brand of The Twister builds very quickly and and are just looking for a change of .35 sleeve-bearing engine you wish. Pop easily from the full-sized plans and pace, the size may not be as much of a for a set of lines, 60 feet by .018. and an careful step-by-step instructions. On the consideration. In either case, you will EZ-)ust or equivalent handle. This hard­ good side, we can laud Sig for the find the 48-inch wing just about right for ware will last you for a long time and excellent die-cutting, accurate band­ an engine around the .35 size category. through many hours of flying enjoy­ sawing of the heavier balsa and plywood The model is large enough to give a ment. so pick the good stuff. parts, the complete plans, and the good ''feel" on the lines and seems to be We chose the Sig Twister because hardware pack . . . everything necessary happiest with this size motor. of its larger size, as compared to the for the completion of the kit is in there Most modeling acquaintances will Ringmasters and Flite Streaks and so except those hardware items specifically havean engine of thissize layingaround forth, because of our more mature and listed on the outside of the box. On the in a box somewhere, which you can gentlemanly (read "slower” ) reflexes. bad side, we found the wood selection, probably grab for the price of a couple An old but friendly Enya .35 was dusted even for a mass-produced kit, to be of six-packs. If you can’t find a used off, and we acquired a uni-flo tank from somewhat less than satisfactory in some areas. For instance, one of the flap pieces was of rock-hard balsa, while the other was so pith y and soft it was unusable and had to be scrapped. While the wing ribs were easy to separate from the sheets, they were cut on a bias angle, requiring that they have their grain direction staggered during assembly. Since the assembly instructions are extremely well-done, we won’t go into a whole song-and-dance about how the airplane goes together. Instead, just a few points should be mentioned: 1) The mount for the bellcrank, in the center of the wing, is shown concen­ trating all the centrifugal loads of flight onto the bottom 1/4-inch balsa spar. This looked a little flimsy to us, so we beefed it up with the addition of a few scraps of 1/4-inch wood to spread the load over the center section sheeting. It’s probably strong enough as shown on the plans, but the small amount of added wood made it much stronger. 2) A three-inch nylon bellcrank is supplied in the kit. We were a little worried about the lack of free move- Jean powers his Twister with an old model Enya .35, fitted with an O.S. muffler. Note the use of muffler pressure to provide a constant flow of fuel to the engine. Continued on page 74 R/C MODEL BUILDER Schoolyard models are great fun, nice for attracting newcomers to F/F (see text). Columnist yard model, easily built by beginners. Marc Hutch winds while eldest son Marc holds; younger son Michael looks dubious. Hutchinson shows what it looks like. ATTRACTING NEW FREE FLIGHTERS by TOM HUTCHINSON Free flight has more of a problem attracting newcomers than does radio PHOTOS BY AUTHOR control or control line, because fewer people are exposed to our brand of activity. We tend to operate out in the boondocks, far away from the general Tom Hutchinson's new address. populace, for nearly all of our contests 20518 S.W. Leeds Ct. and test flying. It’s no wonder, then, that Aloha. OR 97005 the newcomers to our branch of the hobby tend mainly to be relatives of established fliers, or those who have MODEL OF THE MONTH: except the eventual winners, of course, been previously exposed through earlier Sal Taibi’s 1/2A Spacer but then the fun was in the trying, wasn't modeling experience. If we are truly One of the most enjoyable parts of my it?) interested in attracting new blood to recent recuperative period was joining Towards the end of the Nostalgia era, free flight, those who practice the art the Nostalgia movement which I’ve the Spacer design probably racked up must make more of an effort to make been publicizing for the past two years. more Nats wins than any other design, our activity more visible. The vehicle for this accomplishment was although its supremacy was severely I’m NOT talking about giving more a 1/2A version of Sal’s ’’Spacer" design. challenged by the Ramrod in the late publicity to our contest activity! The I’d handsawed a few sets of ribs just ’50s. Looking at the results from recent high performance and complexity of before I moved, and Dave Linstrum had Nostalgia contests, the Spacer is doing our sophisticated competition machine­ sent a set of full-sized plans, so I began just as well 25 years later. I drew up the ry is more likely to scare off prospects construction as soon as I had the strengt h three-view from an original kit gra­ than attract them. No, what we must do to crawl around the garage and locate ciously loaned out by Don Dodd; it was is show the general public that our them. Actually, this was the hardest part intended to be included in my Nostalgia activity exists, that it is enjoyable, and of the entire construction stage. Bob article in the June 1980 issue, but we ran that it is not beyond their ability and Stalick claimed a total of about five or six out of space. You shouldn't have any pocketbook to pursue. This is not going hours to get the model up to the cover­ trouble scaling up the Spacer’s straight to be achieved by having all of our ing stage, and he was being conservative! lines to full-size, and, as mentioned activity take place 50 or more miles With modern adhesives like Hot Stuff earlier, building it is a snap. (Full-size outside the city limits. and Super Jet, and the old-style simple plans for the Class AB Spacer are avail­ Our flying sites are isolated because construction of the ’50s, building the able from John Pond, if you want some­ the performance of our contest models Spacer was a pleasant throwback to the thing larger.) You shouldn’t have any is too great to allow them to be flown on days when everybody started their trouble having one ready for testing this smaller, more accessible fields. But the model for the next contest on the pre- spring. (Next month, we’ll reprint Sal’s essence of free flight is not in the high ceeding Monday night. (Everybody flying instructions for the 1/2A Spacer!) performance possible with modern

MARCH 1981 63 T J. ί—3/4"

2 R/C MODEL BUILDER Tony Italiano about to launch his somewhat modified No-Non-Cents Pennyplane. Sez it is about 1-1/24 heavy, flies nice, but not a win­ ner. Photo by Erie Anderson. attracting newcomers to free flight, one talk about the following steps in later way to start would be to do more flying months, but none of them will happen technology! I enjoy just watching them of sport models in these local locations. unless the first step is taken to expose fly . . . the length of time in the air is I have a box of schoolyard type models the uninitiated to the joys of free flight. irrelevant, unless it’s a contest flight. readily available every time I have the Notice that all of my schoolyard Watching something you created (orat urge to go flying and don’t feel like models are of very simple construction. least adjusted and launched) climb up, packing the car and driving to the The idea is to show the crowd that then glide down smoothly, completely nearest contest-type testing site. The simple models DO fly well, and make it on its own, but depending on the flight box contains HLGs of various sizes and look possible for them to build one, too. instructions you gave it before launch states of trim, a few simple rubber stick Scale models would have great appeal, . . . to me, this is the essence of free models like the Mather’s Twiggy, plus a but are too complex to be built quickly flight. Top-notch contest models go up few ready-to-fly types like a Sleek by the complete neophyte. No gas higher and climb better, but small sport Streek, Skeeter, or Super Glider. The models are included, because I haven’t models of lesser performance can still only other equipment needed is a found any with the right kind of perfor­ display this feeling to the uninitiated. winder, extra rubber motors, clay, and a mance qualities that would allow them And such models don't need a large bottle of Super Jet. By the time I’ve made to be flown in the limited area of a flying field. The neighborhood school- a few flights, a gang of neighborhood schoolyard. A true schoolyard gas model yard is plenty big enough for hand- kids and/or parents has gathered. They would need a slow climb, or enough launch gliders and simple rubber stick are quickly put to use as winding assis­ stability to fly in tight circles for a minute models. So, if we're really serious about tants and retrievers, and given one of the or so without spiraling in, and a poor extra models to fly afterwards. One such glide to prevent thermaling and let the flying session exposes free flight to more flight stay on the field. Another reason Λ people for the first time than a series of for not using engine powered models is contests with hundreds of contestants. that somebody might complain, and The next step, then, would be to offer you’d lose your convenient flying field. the more interested types (adults or CO2 and/or electric models might do kids) some help in building similar OK, but I don’t have any, and they’re still models for the next flying session. We’ll a bit too complex to start with.

Tom Heppler snapped this pic of John Blair holding George Perryman's "Gossamer Spec­ kled Bird" at 1980 Heart of Dixie Champs. It's a Coupe, covered w ith condenser paper Here's George Batiuk at the '78 Heart of Dixie Champs, getting ready to lose his Class B job (uIp!), hasa 90-second motor run w ith K 81B .29 Series 64. MARCH 1981 65 DARNED GOOD AIRFOIL: Bombshell with a Civy Boy rudder! But it allows the timer to reset when you AH 6-40-7 is a Nats winning design by a famous return to straight tow. When you go into This airfoil was used on Per Grunnet’s American designer of the early ’50s. He’s circle tow, the timer starts, which means “ Cirkeling" (1979 World Champ A/2, more famous for other designs, but this only one circle (or less!) on a 10-second proxy flown by Tom Koster), but I was ship retained at least part of the more setting. But the timer starts when the unable to find ordinates for it until the famous name. Some of my former San model goes into circle tow mode, and Bat Sheet reprinted those presented in Valeers clubmates were flying buddies the neat thing about this is that if you Voo Livre (a Braxilian newsletter edited of the designer, so perhaps they’ll be drop the towline or if the line breaks, the by Andre Gomide). The section was among the first to send in a correct timer starts, and the model comes down. designed by Arne Hansen in 1950, and identification to the RCMB office and If the battery goes dead, the model DT’s, has been popular as an A/2 section in win the free subscription. too! There is less chance of setting the some parts of Europe. Hansen used an ELECTRONIC DT TIMERS DT too short, because there are no airfoil designation system similar to that (from the Bat Sheet, by Steve Helmick) grooves to count, as with a Seelig, and used by the NACA four-digit airfoil Ken Bauer (627 E. Monroe, Orange, the timer will not speed up as the series: the first digit represents the CA 92667) is producing electronic Nordic weather gets hotter. Ken recommends a maximum camber (6%), the next two timers. They look to me like they are THE nine-volt transistor radio battery for digits represent the location of the way to go (or the "all-weather" A/2, if power, and weight is about 1.25 oz. with maximum camber (40% of chord), with not (or a calm-air (with zoom delay that battery. The timer itself is quite the final digit representing the maximum desirable) glider. How does it work 7 small and light, but the nose pod will thickness as the Benedek 6356 favo red by Basically, there's a steel plate fastened to probably have to be specially tailored the Russians, but with extra thickness to the DT line, which is stuck onto an for the Bauer timer. resist towing stresses better, as seems to electromagnet made from the coil of a Price is $25. I saw a sample that Jim be the current trend among A/2 fliers. relay. Some electronic wizardry (an 1C Thornberry had, and my check is in the Another interesting feature is that the chip) times the current flow to the coil mail. I’ll have pictures in a later column. top camber decreases by only 4% be­ and shuts it down when DT time comes. CUTTING TISSUE LETTERS tween the 40% and 80% stations, which A row of tiny rocker switches sets the DT AND NUMBERS Eric Lister says is the key to the top per­ time . . . they are assigned (various) AIL competition models require your formance and low drag displayed by the times.. . and they automatically add to­ AMA number on the wings; FA I models Eppler sections used on R/C sailplanes. gether. In other words, punch 40 and 160 need them on the stab and fuselage, too. (Lister claims this dropoff should not for 200 seconds, or if it is pretty windy, 10 You can take the easy way out and put exceed 5% for top performance. We’ll and 160 for 170seconds,etc. The rockers on decals, but the traditional F/F treat­ be featuring some of his airfoils later.) Its have a hole in them so you can slip a ment for tissue-covered surfaces is to cut proven performance at Taft should heavy monofilament pin through and out the numbers from black tissue. make it an airfoil to consider for serious lock in what you want, and lock out what Here’s how Louis Joyner suggests to do A/2 flying. Gomide says it would make a you don't want. The first rocker switch in it, in the FFFliar newsletter (edited by Bill nice Wakefield section, also. the row is just on/off. Mathews. 2172 S.W. 34th St., Apt. B, MYSTERY MODEL OF THE MONTH Also, there is a micro-switch that you Gainesville, FL 32608): This issue's MM is NOT a Buzzard put in front of the towhook, and this At an art supply store, buy some press-

R/C MODEL BUILDER . ^ W wa« 1 R/C MODEL BUILDER R/C MODEL BUILDER I 111 R/C MODEL BUILDER R/C MODEL BUILDER 'f JL·^ JLJ T R/C MODEL BUILDER + (BUT STILL GOODIES!) -j-

MOST BACK ISSUES OF "MODEL BUILDER" ARE STILL AVAILABLE, THOUGH SOME ARE IN SHORT SUPPLY. ORDER NOW, WHILE THEY LAST! PRICES VARY ACCORDING TO QUANTITY REMAINING IN STOCK. NOTE SPECIAL ANNIVERSARY PRICES LISTED BELOW! Apr. 76 2.004 I SPECIAL ! ! ! j May 75 3.004 I Jun. 75 1.254 ) Put a check mark ( ) by the back issues you MODEL BUILDER MAGAZINE'S Jul. 75 · 1.254 I wish to order. Magazines will be mailed by Sec­ BACK-ISSUE SALE ! ! j Am. 7502.004 ) ond Class, postpaid. Foreign orders (except Sap. 75 01.254 ) Canada, Mexico, FPO, APO) add 3Oi per copy. • ANY ISSUE MARKED WITH "o " IS Cents! \ Oct. 75 01.254 ) Allow about four weeks for delivery. If United Nov. 7501.254 I Parcel Service (UPS) is desired, add$i.25mini- • ANY ISSUE MARKED WITH " · " 50 Cents! J 0ac.75O1.2S4 ) mum for up to two magazines.or add$i.25plus Jan. 76 01.504 ) 354 for each additional magazine on orders for • ...... Λ Fab. 76 0 1 504 ) three or more. Send check or Money Order (no Nov. 71 S3.001 I May 7301.001 I Apr. 7401.004 ) Mar. 76 0 1 504 ) cash, please, and no COD’s). A facsimile of this Dm . 71 2.001 ) Jut. 73 #1.004 I May 74 1.004 ) Apr. 76 01.504 ) order form may be used. An·. 73# 1.004 I Jun. 74# 1.004 ) Jun. 7601.504 I Jan. 72 01004 I Sap. 73 #1.004 ) Jul. 74 01.004 t Jul. 76 01.504 ) Nvna:______Oct. 73 #1.004 ) Aug. 74# 1.004 ) Aug. 76 through M/A 72 #1.001 I Nov. 7301.004 I S/O 74 #1.004 ) Juna 78.1.504 ) Addraat: 72 2.004 I Dac. 73 #1.004 I Nov. 74 01.004 ) Dec. 77 and Jun. 72 3.001 I Dac. 74 01.004 ) July 78 Sold Out City:______State: 4.601 I Jan. 74 01.004 ) Jan. 75 02.004 I *Aug. 78 to date F/M73 2.004 I Fab. 74# 1.004 I Fab. 75 2.004 I aach 2.00 4- ) Mar. 7401.004 I Mar. 75 2.004 I •Nov 78 Sold out PLEASE PRINT^ zip : . R/C MODEL BUILDER, Box 335, 621 West 19th St., Costa Mesa, CA 92627

66 R/C MODEL BUILDER on vinyl leters in the approximate size you want, then mount on a contrasting color of cardboard. These numbers can then be copied on an office copy ma­ chine. Stack four or five sheets of tissue together, lay one of the copies on top The ultimate, in-line luel filter with twice as much tuel filtering capacity as most filters and cut out with an Uber Skiver knife. now available The extremely fine 130 micron The vinyl letters are available in a m polyester screen filters out even the smallest range of sizes, from about 7/2 inch to 3 particles, yet because of the large filtering area, it does not restrict fuel flow Proven 20% inches, and come in white, black, and ONLY 1 % · LONG red. The number of typefaces is, how­ FILTERS IN EITHER DIRECTION better than wire screen equivalents this ever. limited. Since you have to buy five classy looking aluminum filter shouid be used between engine and tank or on your fuel can of each letter or number, some possible ,ine ACTUAL SIZI uses for the extras are on model boxes, CAT. NO. 162 ------tool boxes, or mail boxes. If you want a different typeface, buy ONLY ťí= ~ some black rub-on letters. Use the CLEAN BY BACK FLUSHING $1.75 P largest size you can find. Rub the appro­ priate letters and numbers onto a piece NOTHING GETS PAST THE FINAL FILTER ! of white paper, have it photocopied and enlarged or reduced to the correct size, and then make copies on a copymachine m o t o r and cut out as described above. To save time in the long run, cut out a FLEXdC c o n t r o l big supply of numbers at one time and CAT. NO. save them. (I usually do about 10-15 at a 165 time, saving each letter in a waxed paper sleeve inside a ziploc sandwich bag. TH) Cutting is easier if you use a small cutting board and turn it after each cut, so you can work in the most comfortable NO SHRINK NO STRETCH FREE RUNNING MICRO ADJUSTABLE position. GREAT STRENGTH QUICK. EFFICIENT Apply the numbers using thinner after INSTALLATION PROCEDURE HOT HUMID OR the wing (or whatever) has been given COLD DAYS DO NOT AFFECT THROTTLE SETTING one coat of dope. This way the numbers THE FINEST R/C ENGINE CONTROL CABLE ASSEMBLY AVAILABLE will receive about as many coats of dope as the rest of the surface. On sheeted wings, you can apply the numbers first, n y l o n then the tissue covering. There will be a HINGES slight difference in color this way. How­ THE FINEST HIGH PERFORMANCE RC AIRCRAFT HINGE AVAILABLE ever, the surface will be smoother. PRECISION MOLDED TABS ARE EMBOSSED TO lapanese tissue is available now in ASSURE A ' FAIL SAFE" BOND IN THE RECEIVING every color EXCEPT black. However, I've SLOTS 031 TAB THICKNESS FOR GREATER found that black art tissue is acceptable for numbers and trim. When cutting out STIFFNESS AND LONGER LIFE STEEL the letters, use a brand new No. 11 Uber HINGE PIN FIRMLY LOCKED IN PLACE Skiver blade. It’s considered good form INSTALL DU-BRO HINGES AND YOU to cut out the inside portions of all KNOW YOU WILL HAVE THE VERY numbers and letters first. Toshi Matsuda BEST No. 116 ( 6 e ach ! SI 10 / MINI \ N o .118 $1 00 used to use a layer of waxed paper No. 117 (15 each) $2 49 V SIZE )/I No. 119 $1 95 between the pattern and the tissue, to prevent slipping. Others have recom­ mended a sheet of newspaper above KWIK-HINGE and/or below the tissue stack, for the same reason. Tissue pinstripes can becut in the same manner. I go by eye, cutting SLOTTER enough extra strips so I’ll find enough FOR LARGE AND SMALL HINGES. that match width to complete the striping THE ONLY UNIVERSAL SLOTTING TOOL THAT NOT ONLY CENTERS. job. I’ve found that a black contrast strip BUT GUIDES YOUR BLADE FOR between areas of contrasting colors PERFECTLY ALIGNEO HINGE really snaps up the appearance of the SLOTS EVERY TIME! finished model. While you’ve got the The black oxided. hardened steel knife out, you might also cut out a blades III neatly in a no 2 x-acto kmle handle and work in conjunction supply of black tissue stars, for place­ with our handy alignment jig that ment over the inevitable punctures the features 3 interchangeable snap-on model will receive. guides Two lor large and small leal THANKS! hinges, and one tor d rillin g 3 Stan- dard size holes to match any type ot To all who sent their get-well wishes! hinge you choose to use To George Batiuk, Tom Heppler, Will Nakashima and Tony Italiano, who only $1.95 Cal.No.2l6 heeded my plea for photos! Some are printed this month, some are being saved for later. I could still use some more (especially of younger fliers, for DU-BRO PRODUCTS' my Jr./Sr. of the month feature), so send INCORPORATED in any good black-and-white photos 480 Bonner Road Wauconda. Illinois 60084 U.S A you’d like to see published. ·

MARCH 1981 67 FOREIGN DISTRIBUTORS BYRON & DEALERS AUSTRALIA HOLLAND ___ '.ORIGINALS Kraft Systems Australia Hobby-In W m »« h * Gent. loti. H U S Belmont, Victoria 3216 Waalwijk Tel (052)43 4800 Tel 04160-34573

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Wing Span 85" Retail Value Factory Mail Length 7 6 " $699.95 Order Price Ready to-fly weight 2 3 lbs $559.96 plus $13.00 shipping

Exclusive Quick-start Capabilities! IMPORTANT You must check an engine below (B) to receive proper Byro-Jet Pipe and or Fan Unit Send me: Byro-Jet's exclusive quick-start capabilities ______Pitts Special Kit(s) $29.65 (includes shipping and handling) the fan...and hit the starter. Byro-Jet Fan Unit (S) $49 95 ea plus $2.00 Shipping & Handling Sullivan Starter Extension (S> $ 12.65 ea (includes Shipping & Handling) 'Ö n i Custom Byro-Jet Pipe System (S) $53 85 ea plus $ 1 75 Shipping & Handling Byro-Jet Tuned Pipe System Complete Epoxy/fiberglass Kit @ $24.75 plus $ 1 65 Shipping (MiG 15& F-16I A. Check one MiG 15 Decal Kit; Retail Value 1 Chinese 2 Russian Aero Team 3. Russian Czech Aero. Team i ^ ·· $ 6 7 .3 1 Determine engine to be used and check accordingly Webra 61 Speed « 1030 Front Valve, rear exhaust. Webra .61 Speed «1030 Front valve, side exhaust YSFR 60 Frt. V.R Exh Factory Mail Order Price ^ O S Max 60 & .61 FSR, Front Valve. S Exh H P .61 Gold Cup Rear Valve. S Exh Rossi .61 & .65 ABC Rear Valve. Rear Exh O S. Max 61 VF Front Valve. R Exh $53.85 ^ Webra 61 Speed * 1024 F &R Valve. S Exh O S Max 65 RSR Rear Valve. S. Exh. O P S 60 & .65 Speed. R Valve. R Exh Undrilled Mount Also Available Plus $ 1 75 Shipp N am e ______Phone Exclusive Street or RFD Tuned Pipe C ity ______System! ______I have enclosed check or money order for $ ______Please charge to MC# ______.______E x p ------In addition to increasing power output by 15%. this unique Byro Jet Tuned Pipe V I S A # ______E xp------System provides the necessary noise suppression plus a means to completely conceal No C.O.D. Accepted. muffler within fuselage Available for both rear and Iowa Residents Add 3% Sales Tax. Prices Subject to Change W ithout Notice side exhaust 60 engines Send to BYRON ORIGINALS. P O Box 279. Ida Grove. Iowa 51445 Ph 712 364 3165 Ida Grove, Iowa 51 4 4 5 Several other frames can be made to F/F Scale . . . .Continued from page 54 accommodate different size structures. w U i C il “ f Mmm These, of course, can be used repeated­ and handling. ly; just remember to make them only a Dave has future plans on the board. bit larger than the structure, otherwise It Makes Us His policy is to build and fly an example you will be wasting tissue. of each before putting them up for sale. ★ ★ ★ While on the subject of plans, well- Next, I want to tell you about some Look Better known "plan man” and modeler, Paul metalized paper, and some of its uses in Plecan, has come out with an innovative modeling. Somewhere out there is a Than Us method of selling plans. He is selling source for this material, but I don't know plan packets at $4.00 each; or if you where. Maybe someone out there can subscribe to his service for $15.00, you help. What this neat stuff is, is a lamina­ Modelers who compared the specs will receive five plan packets, bringing tion of paper and what appears to be of the famous Sullivan Starter (shown the cost down to only $3.00. The first aluminum. The overall thickness is in gray box below) with the specs of packet contains the Pilatus Porter (30- about ten thousandths and the weight is the new Sullivan SUPER-12 (shown inch span) and a sport F/F model called fairly light. in white box) have beaten a path to the "Tornado.” Both are very high I use this metalized paper on landing their favorite dealers to see for them­ quality. gear leg fairings. It’s quicker than balsa, selves. Imagine, a 12-volt starter with As a subscriber, you will automatically cleaner and looks great after painting. 25% more power. And it can even be receive each packet when completed. If On my AVRO 504. it was used for all of used with 24-volts to start just about you desire more information, the ad­ the simulated metal panels, but I later anything. That’s why it makes us look dress is Paul Plecan, 3023 Saratoga St., found one drawback in this particular better than us. Ask your dealer to Riverside, CA 92503. use. The fuel residue from the diesel ★ ★ ★ engine seeped in between the paper show you the fact sheet. I want to talk a bit more about cover­ and metal layers and caused the surface ing. Seems as though regardless of how to wrinkle. Needless to say, I was slightly careful I am covering a rudder or stab, perturbed. Had I known this, I would FAMOUS SULLIVAN HI-TORK STARTER wrinkles always manage to crop up. I have coated the backside with several USED WITH 12-VOLT BATTERY have talked before about reinforcing coats of dope; I’m sure that would take different areas of the structure so that care of this problem. Before applying they do not “ give” during the shrinking the metalized paper onto the fuselage, I stage. Even with all this care, too often took a Scotch-Brite pad and rubbed wrinkles still appear, ruining an other­ across the surface in one direction only. wise acceptable covering job. This This really gives thesurfacea metal look. seems to occur regularly with perfectly Since these panels were painted, the flat flying surfaces. rubbing provided an excellent ” tooth" Well, I have a remedy that I’ve known for the paint. I used R/C-56 glue for about for years, but have been too lazy attachment to the fuselage. Torque...... 230 in oz. to try. When it came time to cover the One other item I made from this H orsepow er...... 2/5 HP large, flat stab on my Peanut model of material was theexternal gas tank, which C a p a b ility...... Starts almost any engine the 1911 Cessna, the first attempt looked sets above the center of the wing on the Free-Turning RPM ...... 4400 like an indoor prop! The stab was made 504. My first thought was to make the M odels...... HT and HTD with 1/32 square basswood and balsa, tank from balsa, but there is too much HTD has aluminum cone and pulley in­ which doesn’t leave much room for wood filling necessary to give the metal stead of nylon error. I made another stab and covered look. I decided that the best solution 2/5 Horsepower this one as follows. I made a wooden would be to make it out of the metalized frame using 1/8 x 1/2-inch balsa mate­ paper. The first step was to find a rial. The length and width was a bit hardwood dowel the same diameter as SUPER HI-TORK SULLIVAN STARTER longer and wider than the size of the the tank. From this dowel, I cut three USED WITH 12-VOLT BATTERY stab and rudder. A couple of cross discs 1/16 inch thick. These were set members were added to keep the two aside until later. A portion of the dowel sides from pulling in, but were placed was waxed, then a piece for the main below the edge of the side members. tank body was cut from the paper, just Tissue was glued upside down on the the right length and only a bit w ider than frame (shiny side down) and left to dry. necessary to wrap around the dowel. I Since I wanted a natural linen look I burnished the sheet with the Scotch- sprayed the tissue with a mixture of Brite pad, then placed it metal side water and Dr. Martin Dye, using an down on a magazine. With a ball-point airbrush. When the tissue dried, it was pen, I made several impressions on the T orqu e...... 288 in oz. nice and taut, and colored the way I backside so that theend resultsappeared H orsepow er...... 1/2 HP wanted it. The stab and rudder were like rows of rivets on the metal side. This C a pa bility___ Starts almost any engine, then white-glued onto the frame. When piece was then tightly wrapped around including most 1/4-scale engines. dry, the stab and rudder were trimmed, the waxed dowels and glued with Super Free-Turning RPM ...... 3500 leaving a perfectly taut and flat surface. Jet. (Obviously, not glued to the dowel, M odel...... HTD-24 The other side was done the same. The but on the seam as the paper is wrapped flimsy structures remained perfectly upon itself.) When this dried the paper 1/2 Horsepower straight! In fact, even after a trip to and tube was slid off of the dowel. The three from Dayton, with all the heat and discs previously cut were inserted into humidity, they are still flat and true. the tube, having one disc in the middle WARNING! I believe that wrinkles and warping and one at either end. These also were Do not fly near overhead power lines. take place after water shrinking; there­ glued into place. fore doping (especially with plasticized The ends of the tank are cone-shaped. dope) has little adverse affect. After I My first attempt was to turn them from CUV covered the Cessna’s stab and rudder the dowel in the lathe. I wasn’t happy ^PRODUCTS. INC P O Bo· C 535 D i-'W .il, Wo *v,now G,o.* P« Ι9 ΐ using the frame, they were doped and with the results, and when these were pinned down flat to dry. held next to the tank, the difference 70 R/C MODEL BUILDER between the two dissimilar materials * * ************************ * convinced me not to use them. By using * a circle cutter, I cut out a couple of * circles from the metalized paper, then * * cut a pie-shaped wedge from these * * circles. A cone shape was formed. A few * -* trials and errors were made until the YOUR BATTKltlKS’ right combination gave me the correct * * size and shaped cones. These cones * * were also burnished and glued with -* BODYGUARD * Super Jet onto the main tank. The seams * of these cones were placed downward * so that they would not show. *■ * Where the cones attached to the main * Don’t Lot Thom D io! * tank body, a neat little bead of R/C-56 * * glue was made, giving the appearance of * a weld. I have to assume that this was the * way the real tank was made. The final * * tank, when painted, looked pretty good. * * I had planned to photograph it for this * * column, but it was lost in one of the test * flights in the barley field used for testing * . . . something about Murphy! * * ★ ★ ★ *■ * Well, gang, there are more rule pro­ * * posals for F/F rubber scale. These pro­ posals are real beauties, and if passed, * * they will hinder the development of -* * rubber scale. There’s no point in spelling * * them out here, because only AMA * members will be affected, and they have * access to them in Model Aviation. * ■* Whether you agree and disagree with * * them, at least let your scale represen­ * * tative know your feelings. With most of * BlGlPdCE L -* these reps being R/C oriented, they A sophisticated piece of lab quality equip­ -Four digit LED readout no mechanical * could give an automatic yes vote, since -* ment for cycling m-cd battenes Accu'ate, de­ clock motors most of them do not know of our needs * pendable. and attractive * •Modern design and tight tolerance compo­ unless you let them know otherwise. -Autom atic discharging and recharging of * nents insure total accuracy down to 1% and * In closing this month's column, I want both receiver and transmitter battenes, simul­ 1/10 of a minute to give you the following dates for a few * taneously or independently * -Available in kit form or assembled and contests this new year. For those * -Switch for three different transmitter * of you in and around Apollo, Penn­ voltages. (6V. 9 6V or 12V) tested * 34G15 Ac· D igip·« I. •nembled $94.96 * sylvania, there is a 3rd Annual Indoor -S w itc h for tw o different receiver charge Peanut Fun-Fly. Strictly a fun-fly with no * rates. (2 0 m a or 50 ma) 34G16 Ace Dig·ρ·ο· I. kit 79.95 * fon Tne cxef mcNcto kit »uuoír entry fees or prizes or trophies .. . just * * loads of fun. This will take place Feb. 8, BATTERIES: From 100 MA to 1200 MA * 1981,at 12p.m. to4:00p.m. atthe Apollo ♦ Civic Center. * CHARGERS: From 1.2volt to 12 volt ·* The Flightmasters schedule for ’81 is as -* EXPANDED SCALE VOLTMETERS * follows: On May 3rd will be the Semi- For more info. send$2 for our 80^81 Catalog. * Annual at Mile Square; on June 14 there * will be an R.O.W., hopefully back at * * Lake Elsinore. The big event, the Annual, * * is on Sept. 20th at Mile Square. Then -* probably another R.O.W. at Lake Elsi­ * ACE R/C, In c. nore, Oct. 14. The year ends with the * BOX 511 D HIGGINSVILLE. MO. 64037 * Jumbo/Peanut, multi-engine contest on * ************************ * Dec. 6. The Flying Aces newsletter has a new laced no more than 1/8 inch apart to formers 1 and 2, 2 and 3, 3 and 6, and 6 editor, and if any of you want to sub­ eep from breaking the thin basswood and 8 respectively. These pieces are a scribe to this outstanding publication, strips as they are bent. Tail surface cut-and-fit proposition. After cement­ send $9.00 to Editor Lynn Reichel, 3301 outlines are made in a similar fashion. ing one piece in place, carefully bevel it Cindy Lane, Erie, PA 16506. · Let the outlines dry thoroughly on the where the next piece will be attached. forms before using them on an assembly. Then the edge of the next piece must be The wing spar is cut out as a single carefully beveled to fit the first. Note Peanut...... Continued from page 51 piece from 1/16 sheet balsa, but could that all the top covering butts against the 1/16X.020 basswood to make the wing be spliced with dihedral braces to save top surface of the fuselage longerons tips and trailing edge as a single lamina­ wood. The tail spars are full depth and and does not overlap them. The formers tion. Wet the strips and shake off the can be made to match the front view. are all just a little narrower than the excess water, then use white glue as a Thick tail surfaces are a rarity on Pea­ fuselage frame at their station to allow bonding agent between the strips. These nuts, but they are scale for VIRI. for this. can be bent around a cardboard or balsa The top of the fuselage is covered with Use a soft, light piece of balsa for the form cut to the inside shape and size, or sheet balsa; 1/32 is called out but it is a pylon. you can put a series of pins around the good idea to sand it somewhat thinner. The struts on the model were cut out inside of theoutlineand use thepinsasa Four pieces were required to cope with of 1/64 plywood, after which 1/32 sheet form. At sharp bends the pi ns need to be the fuselage shape. These run between was added top and bottom and then

MARCH 1981 71 PLANS: ALL CONSTRUCTION PARTS PLOTTED ON efficient design. Cutting your own strips THESE PLANS OF ESTABLISHED SCALE ACCURACY & DETAIL. ADD YOUR OWN SYSTEM FOR FORM OF from sheet balsa offers two advantages: FLIGHT DESIRED; R/C. CL. F/F GAS. RUBBER. ETC First, one can exercise better quality 1932 GEE BEE R 1. 2” - V. 8 sheen 1932 GEE BEE R 1. Z "-1 \ 8 »heel* $16.00 control of wood density, so vital when 1931 GEE BEE "Z ". 2 "«V 11.00 trying for matched components, such as Altové plans used by Granger Williams lor R/C 1932 GEE BEE R-1. 1-1/2"-V. 60* CL win* 7.00 longerons or spars. Second, the cost of 1932 GEE BEE R 2. V '-V . NEW" S/town below 1000 the strips is considerably less than MONOCOUPE 110 CLIP WING. 2 * -V 10 00 1940 CULVER C A D ET. V ‘« V . beautiful· 7.00 commercially available stock. For more 1932 HA LL RACER. 1/2”- V -1 3 " »pan Peanut 3.50 information, contact Gene Dubois and Postpaid VERN CLEMENTS. AMA 70711 P.0 Box 608. Caldwell. Idaho 83605 ask about his other products too. END PLAY Richard Miller, former Editor of Soar­ ing magazine and originator of the VTO

GEE BEE R 2 free flight column in Model Airplane NEWH News, has recently published a paper dealing with the inefficiencies of aircraft wing tips. Although only five pages in RARE GOLDEN AGE BEAUTIES length, the dissertation is brimming with YEARS OF HISTORICAL RESEARCH INVOLVED thought-provoking commentary about aerodynamic characteristics which carved and sanded to the streamlined valve pushrods and rocker arms are strongly affect every aircraft type, from shape. Note the very short stub strut at simulated with bent pins. Inlet and microfilm models to jet airliners. Written each side of the fuselage where the main exhaust pipes are approximately 5/64- with rare insight and a sense of humor, struts attach. inch diameter insulation taken from this paper raises questions that demand Balsa balloon type wheels for this some electrical wire. This tubing was slit answers . . . and points the way to model, 3/4-inch diameter at $.30 per and used for the cockpit edging also. possible solutions. As Miller puts it: pair, were obtained from Mike M ulli­ AND OF COURSE, our illustrious "The wi ng tip has not received the care it gan's Old Timer Models, P.O. Box 913, editor says all models must have a pilot deserves. Quite to the contrary, in fact: Westminster, CA 92683. His 3/4-inch figure* (probably because he was raised While areas inconsequential by com­ wheels are slightly oversize a nd, happily, before the days of Women’s Lib and has parison have been worked over time just match our scale diameter. always been frustrated because he and again, the end of the wing has Williams Bros, plastic cylinders were couldn't play with dolls as a boy), so we simply been left, so to speak, hanging in used as a basis for the dummy engine. carved a pilot figure out of styrofoam, the wind." The crankcase is block balsa w ith a painted it with plastic paintsand installed A copy of this paper is available for plastic thrust button from Peck-Poly­ it in the cockpit. $2.00 cash or postage stamps and a large mers. A plywood front face is built up The model in the photos weighs 16 pre-addressed envelope: Richard from several lavers of 1/64 plywood. The grams with a 14-inch loop of 3/32 rubber Miller, 1368 Rock Springs Road, Escon­ installed. It balances at a point about dido. CA 92025. c ~ ------3/16 of an inch in front of the spar and TURBOTANK CO2 The OCTURA CONNECTIONI-the flies like it is somewhat nose heavy. Some months ago we featured a Recommended balance position would photograph of the new Telco "Turbo­ be directly under the wing spar, but the tank” CO2 engine. Thanks to Ed Toner, one in the photos has not been flown U.S. distributor, we have now examined ΐ I HEX with the balance point in that position one first-hand. Immediately apparent yet. Have fun with your Finnish VIRI. is the fuel tank, which is mounted FLEXIBLE SHAFT COUPLER (*l was never told I couldn't play with directly to the back of the engine dollies until after I got married. Never crankcase, reducing the usual long and knew what I was missing until it was too delicate fuel pipe to about an inch in late.) · length. The tank itself is of special design, incorporating a unique core Hannan...... Continued from page 50 material which it is claimed enables it to hold over twice as much CO2 as the AND ON THE SAME SUBJECT usual Telco tank. Additionally, the tank French builder Georges Chaulet, is equipped with a "vortex chamber" reflecting upon his recent visit to a which is said to spin-dry the fuel to Southern California indoor flying ses­ ensure only gaseous CO2 reaching the sion: "I did appreciate very much the engine. The tank is mounted in such a sympathetic ambiance in the gymna­ manner that it may be easily rotated to sium. Peanutistsare peaceful and gentle permit the engine to be oriented with only people, and it is a pleasure to meet with the cylinder upright, inverted, or them." horizontal. (including one collet) THOUGHT FOR THE DAY Comparison with an earlier Telco Additional Collets: $1.25 ea. “ You know as well as I do . . . if we engine reveals numerous detail changes The Octura Flex-Hex Coupling lor flexible were not always looking forward to in addition to the more obvious ones. shafts uses an interchangeable collet, completion of a project we would start Whereas the early Telco featured a black (available for .250. .187, .150 or .135 one just so we would have to look cylinder, the new example is brightly diameter cable) to hold the cable securely forward to that! Keeps one flexible and polished and incorporates a greater without (raying the end as with set screw connectors. Available to fit V 2 4 . V<-28. in good operation.” Herb Kelley. number of fins. Telco engines employ a 7mm or 6mm threaded crankshafts. When STRIPPERS, ANYONE? cam-type crankshaft bearing which ordering specify thread and collet sizes Nope, not that kind . . . just for balsa controls engine speed, rather than the Ordef directly only it not available at your local hobby wood. Gene Dubois, 14 Budano Drive, more common variable cylinder. That is dealer — add 10% lor postage Illinois residents add additional 5% tor sales tax Acushnet, MA 02743, manufactures two to say, the crankshaft is raised or lowered Send 50« tor catalog and price list to: types. One is suitable for wood up to in relation to the cylinder head, rather OCTURA MODELS, INC. 1/16 inch in thickness, while the other than vice-versa. Early Telcos were ham­ can handle sizes as large as 1/4 inch. Our pered by an inefficient adjusting wrench ^ 7351 N. Hamlin Ave · Skokie, IL 60076 preliminary tests indicate a sturdy and and operating disc, but the new example

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is much improved with a more positive Square Park, marking its 14th year. This next year! hex-shaped part and a thicker wrench. series of meets has been particularly FLYING IS FLYING Power outputs two to three times satisfying to participants because of Several mentions of ballooning in the higher than standard Telcos are claimed their low-key, non-pressure spirit. Fun “ Hangar," including Tom Nallen’s lyrical for the Turbotank, as well as duration and good fellowship is the first order of account of his first ride, brought a extensions sufficient to permit indoor business, but in the bargain one has the surprising amount of favorable mail. free flight, control line and ultralight rare opportunity of seeing truly unique And while we usually try to avoid "ad­ R/C model flying. Apparently the only flying machines in action. Many of the ventures of the author” items, we felt negative factor is a slight increase in contestants have been present for nearly this experience deserved sharing: w eight. . . about 20 grams as compared all of the wing events, and it is suspected BAPTISM UNDER FIRE with 14 grams of the standard engine, a that some of their models have also! Why would anyone in their right mind small price to pay for such remarkable However, new faces (and new designs) want to arise at 3:30 a.m. on a Sunday gains. are making inroads against the Old morning and drive for hours in fog and Price and ordering information may Guard (and elderly models). Variety darkness through unfamiliar territory to be obtained from Buzzer Models, P.O. adds to the pleasure with classes for free an obscure location near Perris, Cali­ Box 124, Howell, NJ 07731. flight gas, towline, rubber, and electric, fornia? How about an invitation from a 14 YEARS OF WINGS plus R/C. Our congratulations to the lovely blonde aeronaut to join her for a The Northrop Flying Wing model management of this most refreshing flight in a hot-air balloon! At least that contest was recently conducted at Mile contest, and we hope to see you again was the plan.

What do you know about Modelling in Germany? Not enough. I guess! Come on get in touch with it. Order a subscription of the well-known and outstanding Special-Magazine ..auto-modell + technik". This monthly publication infomisyou about the whole field of models, motors and rc-sets. It shows working out. luning und repairing of car and engine. You don't speak German? Who cares, all the pictures, formulas and plans are speaking to you with their own language. That's why this magazine is known in more than 15 foreign countries. Come on. just try it. Send us your cheque with US-$ 30- and monthly you’ll lind your issue in your mailbox. As a special gift we will send you our special magazine from the last famous Toy-Fair in Niirnberg with all the new models and developments, free of charge! Make use of this chance, and you will be 100-pagc-informaiion from 12 issues per year free mail­ more informed than all your friends! the famous show ..Niirn­ box delivery berg Toy-Fair” Only 3 0 - US-$ for one Please send your order to: Verlag flir Technik und Handwerk GmbH. P.O. Box year-subscription 1128.7570 Baden-Baden. West-Germany

MARCH 1981 73 After finally locating the specified fit” of the fuel tanks, instruments, pilot, intersection, absolutely nothing could and passenger within its confines. be seen in any direction. But then, a With a blast of throttle and "all hands pickup truck hove into dim view, and let go," we were off and accelerating with a wicker basket in the back . . . a upward with deceptive smoothness . . . sure sign of a balloonist. We followed it rapidly gaining altitude with an almost into a field just as the first glimmer of im perceptible sense of m otion. It daybreak appeared, revealing several seemed not so much that we were rising, other balloon crews all awaiting im­ but rather that the ground was falling proved visibility. away beneath us. One of the most Our crew, meeting as a group for the impressive aspects of balloon flight is the K .61 R /C first time, consisted of balloon owner/ remarkable acoustical sensations. In ilot Linda; Diane, semi-experienced between the authoritative audio blasts elper; a bright-eyed and alert young­ of the burner, all is stillness. Dogs ENGINE ster of about twelve; and two rank barking and conversations from earth- novices, including yours truly. Six a.m. bound mortals carry up with startling was the scheduled time of launch and clarity, the result of moving at exactly we were all raring to go. Alas, Mother the same speed as the air. Nature wasn’t and we began to wonder We gently wafted over the fascinating if the fog would ever lift. The object of Orange Empire Railway Museum,enjoy- such an early start, of course, is to avoid ing a wonderful and unique top view of wind gusts, which are even more dis­ the rolling stock below. Gradually we tressing to balloonists than to modelers. drifted over a larger empty field and, Seven a.m. and still fog .·.. calm, suspended at about 350 feet altitude, though (moreso than our nerves). Eight had the opportunity to realize a long- a.m. and the veil began to lift, along with held whim . .. that of tossing out some our spirits. Another crew, eager to go, tiny balsa gliders! The first, not quite began preparing their balloon for flight, correctly adjusted, entered a tight-to- while we watched with more than casual the-right spiral and descended to the interest, since we "first-timers” were ground in about 45 seconds. Glider expected to learn the routine immedi­ number two boomeranged back to the ately. Soon a second crew sprang into launcher like a movie running back­ This schnuerle ported .61 provides action, and with that our "Commander” wards! The next try resulted in a perfect easy starting, high performance and gave the order to start unloading our flight of approximately 90 seconds longevity. Produced with the finest balloon equipment. Although relatively duration. Not bad, considering the materials, workmanship and quality new to the sport, Linda radiated enthu­ damp air. The junior member of our assurance, you'll be proud to have siasm and confidence, contageous even ground crew adroitly recovered both to those of us who were still wondering models, which were later given to him your aircraft powered by the K.61. what we were trying to do. My own for his efforts at anti-litterbugging. background included a fair amount of I suggested to Linda that had we been Suggested Retail: aircraft ground-handling experience, near a thermal, the gliders might have S139.95 Muffler Included but my knowledge of lighter-than-air performed better. She shook her head craft was almost nil . . . which became and explained that unlike model aero- quite obvious when trying to carry out planists, balloonists prefer NOT to assigned tasks. Another of our crew, encounter thermals. It seems they can T.61 R /C however, was equally inept, so we could drag balloons spinning upwards in an at least share embarrassment! Filling a alarming manner to excessive altitudes, hot-air balloon is not an easy task. The and are difficult to escape! Live and ENGINE envelope must be removed from its learn. canvas bag and arrayed on the ground At last our idyllic aerial adventure was properly, shroud lines must be attached drawing to a close ... rather like having to the basket, and the propane burner to wake up from a dream about flying installed. without the need of an aircraft. A The initial filling of the envelope suitable landing site was beneath us, and involves the use of an engine-driven fan, with great precision, Linda brought her which swells the balloon to a fair per­ marvelous balloon to a gentle landing. centage of its volume, but still leaves it Our total time aloft was about 44 min­ reposing rather helplessly on its side. utes, yet it seemed only moments. The next, much more exciting step, Certainly I felt much younger than when requires someone to enter the balloon we left the earth! Truly a fantasy ful­ with a propane-fueled weed-burner, filled. which heats the trapped air, causing the Bill Hannan, Box A, Escondido, CA envelope to rise to a more nearly vertical 92025.______· position. Then the basket-mounted main burner is lit, belching forth a huge Twister...... Continued from page 62 Fuel efficient and easy handling! tongue of flame, sounding much like a Dyna-Jet engine when the "blast valve” ment of the bellcrank once installed on AVAILABLE SOON is opened. The heated air swells the its mounting plate, so substituted a balloon to a ripe fullness, and it is ready three-inch metal Hi Johnson bellcrank RJL INDUSTRIES for flight. for it. Personal prejudice again, prob­ By now everyone was holding on to ably. 1831 BUSINESS CENTER DR . the basket to keep it down. Linda 3) Although the plans and instruc­ DUARTE. CA 91010 conducted her final checks, then mo­ tions call for the flaps to be installed after PO BOX 5654. PASADENA. CA 91107 tioned me aboard. The tiny traditional the wing has been mounted to the wicker basket is sturdy and nicely fuselage, it is virtually impossible to line (213)359-0016 padded around its periphery, which is up the flaps properly if these instruc­ somehow reassuring, as is the "friendly tions are followed. Instead, we suggest

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ROAR CHAMPION EFRA CHAMPION WORLD CHAM PION ASSOCIATED f 928 East Edinger · Santa Ana, CA 92705 USA that the wing cut-out be enlarged so that of it was a little more soldering practice. enough pull to let you know there's a the completed wing, with flaps installed So far, we’ve had a ball flying the real flying machine out there, and goes and hinged, can be slid into place. This airplane. Control line gives the pilot pretty much where we ask it to go. It leads to a little more work, but will more "feel" as to what the machine is does seem to stagger a little on square eliminate the possibility of an aileron doing than any other form of model turns, but whether this is because of the effect creeping in. guidance. With the balance point where weight of the airplane or because we The ship shown was given a rather shown on the plans, the first flight haven't really gotten it completely spartan finish, by todayvs control line showed the ability of the model to fly dialed in yet is a good question. stunt standards. The fuselage and em­ slowly enough to allow us to correct In summation, then, we can heartily pennage were filled with Aero-Gloss most of our control mistakes before recommend the Sig Twister to anyone sanding sealer, covered with the silk- getting close to the ground. We hadn't who is getting a little jaded and tired of span supplied in the kit, and finished flown control line for about four years the same old stuff. At its price it is a fine with Aero-Gloss Swift White and Stear- before the first flight of our Twister. On value and an excellent airplane which man Red. The wing was covered with the first flight we were doing consecu­ will return many enjoyableflightsforthe white Monokote, then trimmed with tive inside and outside loops, horizontal investment of time and money it re­ transparent red. and vertical eights, inverted wingovers, quires. One thing, though; Leave the The landing gear was mounted exactly and just generally horsing around. The "Figure Nine" maneuver to me . .. as shown on the plans, but the cotton- airplane feels good on the lines, with someday I’m going to master it! · pickin’ 4-40 screws supplied with the kit weren’t quite long enough to reach completely through the wood sides of MOVING TO SOUTHERN CALIFO RN IA? the fuselage. Do yourself a favor and get some longer screws to mount the gear MAKE SURE YOU GET A HOME with the nylon bracket supplied, then WITH A MODEL WORKSHOP ! ! cut off the excess. It will be well worth the money, and you can probably use FOR ALL YOUR REAL ESTATE NEEDS, the screws someplace else later anyway. CONTACT: Lastly, the ship does not come with an ANITA NORTHROP adjustable lead-out guide. We went ahead and built one, under the philo­ sophy of nothing ventured, nothing MLS gained. We had never even seen one of NORTHROP these critters before, so ours probably weighs about five pounds more than it ca should. Anyway, we ultimately ended Real Estate up with the lead-outs positioned where 621 West 19th St., Costa Mesa, California 92627 (714) 642-5062 shown on the plans, so all we gained out

MARCH 1981 75 and products Gene has. Since then I have not heard a bad word about P&G’s work. And yes, I checked with some people who are using engines that Hempel worked on. Most enthusiastic reports come from those in Mouse Racing; they say the TD .049 with a chromed crankshaft and the case honed to fit the chromey crank lasts real well and runs fast besides. Owning The If you are interested in chrome work of most any kind, honing to fit the newly RADIO CONTROL chromed parts, or TD .049 trick stuff along with a few other little things BUYERS GUIDE having to do with going faster, I would suggest that you either write to Gene at Is Like Having The the above address or call him at (214) Information in 260 272-5210.______· 0/400...... Continued from page 57 Manufacturers’ prepared, comprising the two formers, engine bearers, and 1/8 sq. top rails. The Catalogs bearers are temporarily glued to two 1/4 square strips which are passed right The Guide has illustrations, descrip­ through the fuselage. Thus, the engine tions and prices for more than 2.400 mounts are held in the correct position radio control items. The information in while everything else is assembled this industry master catalog is organized, around them. Attach all the supports which pass to the lower center section. indexed and cross-indexed for easy Incidentally, I use a couple of spots of 5- reference. minute epoxy at this stage for each part, Included are the latest model cars, which can be ground away if a mistake is sailboats, power boats, aircraft, radio made, later gluing properly with slow- systems, tools, books, building materials, setting epoxy. engines, and accessories. The upper center section is positioned The New th Edition has 280 V ” x on the center struts and the two rear 6 8 2 outer struts, with temporary wooden 11" pages of information. It is a must for jury struts at the leading and trailing every serious modeler. edges to maintain incidence. When completely satisfied that all is correct, Suggested Retail $9.95 I Yes, rush me my copy of the new 6th edition glue it in place, then add the upper i of The Radio Control Buyers Guide. nacelle stays. The engine nacelle jigs can I Please check one: now be removed and their structure I O Enclosed is $11.00 ($9.95 retail plus $1.05 postage) completed. The rear nacelle cones are of (U.S. and Canada Only — Canadians send U.S. Funds) 1/32 sheet formed around a balsa mold. At Better ■ D Charge my G Mastercharge DVisa Radiator rims are simply a strip of I aluminum wrapped around the front Hobby I C h a rg e n o ------E xp. D a te ______former, and radiator shutters are from f 1/64 ply. The detachable cowling lids are Shops or I N a m e :______aluminum, held in place by large press ■ studs. Direct. I J S tre e t:______ENGINE CUTOUTS The system used is verysimple (crude?) but is reliable once properly set up . . . it I C ity . S ta te , Z ip :______V takes a little time to get the various wire ' j Return to: R/C Buyers Guide, 6 Clifton House, Clifton, VA 22024 and fuel line lengths correct. When the timer trips, the wires pull, via bellcranks, on the fuel lines, causing them to kink at working over some dork’s engine just so the engine intake, stopping the motors C/L Continued from page 61 he can set it too lean and burn it down instantly. The wire loops are located on and then bad-mouth the reworker the fuel lines by inserting short lengths your TD.049, just $49.95 in check, money sounds like one of the least pleasant. of brass tube midway. order or food stamps.. . Still, these rework people persist, and a COVERING You see, when George Aldrich closed very great percentage of the time I The airframe is covered with light­ up shop to stir the mixing vat full time, a either ignore the notes or wait to see weight tissue and given one coat of void was left in the engine rework what happens in the next few months. dope. It is best to rub a candle over the business. A rather large void, evidently, If the guy is ripping people or service is fuselage cross members to prevent the not from the physical size of George but crummy, I generally hear about it. covering from adhering. The model is from the fact that he did a lot of engine However, there is a good side to the then double covered with silk. Each work, in fact did it full time and as his story, and that is where Gene Hempel, panel is cut to size and rinsed in waterto only source of income . . . at least that is P&G Metal Shop, 301 North Yale Dr., remove the hard finish. After carefully how the story goes as told to me. So, in Garland, TX 75042, comes in. Just over a ironing the silk, it is laid dry over the the past couple of years or so there have year ago I heard from Gene, two simple tissue and dope is brushed through, been several people try to jump into the mimeographed price sheets, one for taking care to avoid air bubbles. These rework business. I am not sure why, as of chrome and honing work on any size have a habit of appearing at the last all the ways there are to make money, motor, the other for the .049 services minute, so keep an eye on the job until it

76 R/C MODEL BUILDER is completely dry. The fabric lacing on the fuselage is NOW, TOERE S A PRIMER reproduced by using a sewing machine RECOMMENDED FOR COVERITE. to sew a zig-zag line on heavy-weight tissue. This is cut into a narrow strip and New Primex solves a nagging problem. Now you doped in place. I finish my models in matt cellulose can be sure, for the first time, of getting great dope, which does not need proofing adhesion. Now, when you remove the masking against mineral oil based diesel fuel, or tape, the paint job, will stay down! Primex is even castor oil based fuel if it is cleaned off occasionally with ether. ------[ ultra-light, smooth, and TRIMMING É å I very quick to dry. Easy to Check for warps and get the balance apply with a brush, point in the right place . . . it may seem a little far forward, but it does remove all —---- -—^extremely sandable. Primex is stalling and ground looping problems. now the only primer to use on Coverite Find a gentle, well-grassed slope and get (Super, Permagloss & Silkspun). the glide right. You will probably find it is OK, with no elevator adjustment It is equally great on wood, necessary. The central fin is temporarily tissue, silk, nylon or dacron. shimmed in place with thin ply and eventually fixed with spots of silicone Look for the bright yellow rubber. can at your The engine starting procedure is as R/C dealer. follows: 1) Start the port engine, allow it to thoroughly warm up, and stop it. 2) Start the starboard engine, adjust, and restart the port. Tune the engines until they are "beating" at intervals of 1/2 second or less. 3) Top up the tanks and replace the cowling lids. 4) Start the timer, replace the lid, and release the model. On the first power flight I was natural­ ly apprehensive, so I put the propellers C O V E R T E JL on backwards to reduce thrust. Anti­ 420 BABY1 ON ROAD. HORSHAM. PF.NNSYl VANIA 19044, U S A cipating a powered glide into the grass, I was surprised when the model climbed to 30 feet on a straight flight path before TREAT YOURSELF TO A the engines cut for a perfect transition and glide. No trimming was required at CUSTOM BUILT all. When a few more rigging wires and Telephone: TIPORARE details had been added I was able to turn the props the right way around. by DICK HANSON Finally, a word about documentation Our custom built airframes are used by many of the country's top pattern for the contest minded. The model was fliers. For example, we furnished designed primarily for competition basic components for 1/6 of the mod­ work and so is, as far as I know, dimen­ els flown In the 1979 Masters Tourn­ ament. Some were TIPORARES. sionally accurate. The scale is 1/18, some were not. which gives a wingspan of approximate­ Building pattern birds Is a business ly 67 inches. The main scale drawing w ith us, not a sideline. We can save you considerable building time by used was from Bomber and Reconnais­ providing you with good, basic NEW. 825 sq m. TIPO sance Aircraft of the 7974-78 War. pub­ construction. AVAILABLE NOW !! lished by Harleyford Books of England. Write or call us concerning your requirements. We w ill be happy to Unfortunately, this book is now out of 5269 Lucky C lovar La. review them with you and quote print, so you may have to hunt around Murray, Utah 84107 prices and delivery. for a copy, or contact your library. Another drawing, from Model Air­ plane News, shows excellent construc­ tional detail, but is not very accurate in outline. Photographs are fairly common, show­ ing 0/400’s in a variety of schemes, including postwar transport roles. Good luck with your model. Any particular problems may be forwarded to me via R C M B . ·

MARCH 1981 77 RC Accessories

SUPER POWER STARTING BAT­ TERY. Super high power light weight POWER PANEL. This starting battery uses new G.E. Gates Cells. This 12 volt 2.5 amp hr battery nifty power panel is spe­ weighs only 2 lbs but has more starling cially designed to provide power than most batteries three times proper power forms to its size. (4014A) your starter, glow plug and THE NEW MINI STARTER fuel pump. It features high STARTS THE SMALL ONES and low glow plug outputs FAST. Specially designed for and a center off reversing quick sure starts for ViA glow en­ switch for your fuel pump. gines, the mini starter features a 12 12 VOLT BATTERY volt high speed permanent magnet CHARGER. Designs to (4015) motor with ball bearing front end. charge all 12 volt gel The drive cup is designed to fit the cells and motorcycle COX T.D. prop nut or a small spin­ batteries overnight from DRILL CHUCK. This nifty drill ner, a grove for a marine o ring is a 110 volt wall outlet. chuck plugs directly into your mini provided, and a rubber boot for Carry this mini charger starter converting it into a high starting jerobee cars. Replace­ in your flight box and speed drill or grinder. High quality RSTRD f l ig h t inc. ment rubber cups and boots avail­ don't be caught with a Jacobs chuck accepts up to % inch PIONEERS IN SILENT FLIGHT able. (4013) dead battery. (4006) urills. (4022) 13377 Beach Avenue Venice, California 90291

first convert these polar data to a wing of false impression that will be created by Soaring...... Continued from page 27 finite aspect ratio. We do this by adding your September, 1980 article. Regards, aspect ratio and Rn, but it may be useful induced drag, Cdi, to the polar value of Woody Blanchard, )r.” for a first cut. If I had to make a guess Cd. Cdi = (CH)/( (AR)]. Now let's hear what Ian has to say how thickness would affect these figures, "Doing this, we find that for a wing of about all this. I would say that thinner sections would AR = 10, at Cl max = 0.95, L/D = 95/ “ Dear Larry. be at slightly lower values and thicker (.021 + .029) = 19; at Cl = 0.8, L/D = .8/ “ I’ve read the comments of Blaine ones at higher values. Regards, Blaine (.016 + .020) = 22.2. Rawdon and Woody Blanchard Jr. con­ Rawdon." “ Mr. Turner says that Cl max =0.5, and cerning my article which you published “ Dear Larry: Cl/Cd max = 10, for a wing having only in the September RCMB, and I’d like to "With reference to your column in an AR of 10:1. respond to both letters and perhaps the September, 1980 R/C Model Builder: “ You'll note that by correcting Mr. enjoy a continued dialogue with knowl­ "As a semi-retired aerodynamicist Turner's number, the Eppler 374 will edgeable fliers. who (a) loves R/C sailplanes and (b) is look better than the other compared “ First, the intent of my article was to very impressed by the polars and the sections in all his tables, instead of illustrate some of the fundamental and actual performance of the Eppler 374 at a worse. Within the past month, based on first order characteristics of some of the Reynolds number of 700,000, I must these findings, along with a bunch of three generic wing section types used in point out some gross errors in the Eppler actual (lying at Rn = 100,000, I’ve recom­ today’s sailplanes to enable a sailplane 374 study performed by an Ian Turner. mended this section to a number of designer or flier to better understand “ Refer to the enclosed Eppler 374 people, including Stan Watson, Paul the resulting behavior of his design. polars and note that at a Reynolds Wedeking, Dwight Holly, Herb Stokely, "Second, since I could not find specific number of 100,000, Cl max=0.95; also be Bob Champaine and Austin Leftwich. experimental results for all three wing advised that to calculate L/D, we must Please consider correcting the very gross section types (at Reynolds numbers of

K.P.SERVO ARMS. Longerand K.P. SHOCK ABSORBING SERVO stronger than stock units. For 1/8- ARM. SASA-7 (Fits S6, S7, S23. or scale cars, also 1/1 2-scale off-road any servo with 4.5mm(.177") square cars. Fits S24, S7, or servos w ith drive. SASA-B (For Bantam Midget 4.5mm(.177") square drive. or any servo with 4.5mm [.177” ) S 1.00 each square drive. SASA-20 (Fits S-20 K.P. TIRE HORNS. Tool K.P. BALL FLAGS. Fuel- or any servo with 4mm (.1575") is just like factories use to proof plastic, 1-3/4" dia. square drive. mount tire doughnuts on Snaps on top section of KIMBROUGH $2 .00 each wheels. Complete with transmitter antenna. High­ gluing and truing instruct­ PRODUCTS ly visible. All colors for 27, ions. 53, and 72mHz. 1.4" dia. (1/121- $1.75 $ 1 .0 0 each ZOT dia. (1 /8) - S2.50 1430 E. St. Andrews Place, Unit E, Dealer and distributor i quiries invited. Santa Ana, California 92705 Phone (714) 557-4530

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100,000), I chose values for Cl from a that I have come across and the dili­ "Woody Blanchard’s remarks refer to variety of publications which seemed gence applied to this experiment must my use of a 0.5 value of the max Cl value typical of the values for such sections at be highly praised. To reduce the vari­ of the Eppler 374 section. He correctly this very sensitive Reynolds number. ables and to really uncover some sub­ points out that Eppler’s calculated value "Finally, my calculations assumed a stantial data, this experimental tech­ is 0.95 at a Reynolds number of 100,000. sailplane of identical shape factor except nique should be applied to a model of "Without trying to defend my guessed for the wing section, and I used drag identical shape factors but using a value, let me point out that although values extracted directly from Sighand variety of wing sections. This would Eppler’s magnificent program has Hoerner's excellent treatise on drag really provide some interesting data. demonstrated good correlation be­ which, although published in 1951, is still "Blaine’s final remarks refer to the tween theory and experiment at Rey­ considered by many to be a relevant and range of usefulness of a section, which I nolds numbers of 200,000 and 400,000, it classic work. Extrapolations for the drag did not address in this particular article. I has not been as successful at Reynolds values as the Reynolds number varied agree entirely with his statements in that numbers of 100,000 and less. His experi­ for each of the considered model flying flat-bottomed and semi-symmetrical ments have not been able to substan­ conditions were also based on Hoerner’s sections offer a wide range of operating tiate his high predicted values of max Cl work. The whole exercise was non­ Cl values without seriously varying the and in addition, the shape of the calcu­ trivial, and using my TI 58C crammed full sink rate of the sailplane. lated drag polar is grossly different from with routines, the calculations took 40 hours! "With this background, let me address W E GET LETTERS Blaine’s comments and excellent experi­ PATENT ments. His results seem to indicate that STARTED USING IT AND USED PENDING! he and I have a serious case of agree­ NOTHING ELSE SINCE - USED IT ment! "Blaine’s measured values for Cl are EXCLUSIVELY AT WORLD CHAMPS $59.95 all higher than those which I used but IN SOUTH AFRICA WITH MANY are roughly in the same proportion. If I NICE COMMENTS. were to inject them into my theoretical model I’m sure my conclusions would MARK RADCLIFF C & D G L O -D R IV E R have been little changed. His experi­ 1979 U.S.A. AEROBATIC TEAM mental results were taken at widely AVAILABLE AT YOUR differing Reynolds numbers which SURE STARTS UNDER ALL CONDITIONS. HOBBY DEALER would seriously change the glide ratio, and his conclusion about the Goose may JOE BRIDI well be that bigger is better to some C&D ENTERPRISES ( 714) 968-6474 degree. 10042 Merrimac D r., Huntington Beach, CA 92646 "Blaine’s technique is one of the best

MARCH 1981 79 club members when it was either the EMS SR-1 only plane aloft or worse still, going up in a soft thermal with everyone else SERVO coming down! "As to the Eppler 374 section. I believe REVERSER $54.50 Jlus frelgnt. that its behavior may well be a little Price - $10.95 better than most other sections of Plug! into your system between the Receiver similar camber and thickness; however, and Servo and reverses the direction of that this difference will certainly be small and servo with relation to the Transmitter Stick could easily be masked by model design, motion. Available for all popular positive or building quality, and flier ability. It must negative pulse systems w ith connectors in­ surely possess similar generic charac­ Each head fully adjustable 360° in every di­ stalled. An extremely handy device when teristics to similar sections. I would urge rection. Ideal for precision assembly, solder­ installing your system in a new airplane. ing, welding, gluing, light machining, etc. the reader not to believe that any one Master Charge and VISA section possesses some magic that makes Dealer Inquiries Invited JIM CROCKET REPLICAS it vastly superior to others under all conditions. It is the section correctly P O BOX 12600 ELECTRONIC MODEL SYSTEMS applied to the correct design, intended P.O. Box 1242, Placentia, CA 92670 FRESMO. CA 93778 for a certain application, that results in an effective sailplane. Sincerely. Ian the experimental. more data for this purpose. Turner.” "With this lack of correlation I felt "In conclusion. I would liketosay that See you next month. · justified in using a value of Cl lower than under very moderate wind conditions, that calculated. However, in my enthu­ undercambered sections, when de­ Choppers . . . . Continued from page 35 siasm to illustrate the behavioral dif­ signed into a purpose-built sailplane, ferences between the sections, I now can provide spectacular thermal perfor­ under the whirling rotor blades to pinch realize that I chose a value which cer­ mance. To this end I have designed and off the fuel line to stop the chopper, and tainly understates the capability of the built what I call my 'Minimum Sink’ it puts added strain on the clutch during 374 to some extent. If I were to raise my sailplane. It is a four ounce per square starting. guess to, say. 0.65, it would make semi- foot. 100-inch design with optimized Once the idle is properly set just symmetrical sections a better com­ aspect ratio, etc., etc., and in calm and below clutch engagement at low promise than I indicated, but before I very light wind conditions this plane has throttle, low trim, we look for liftoff at crank out the calculations again I intend averaged about 20 minutes per launch. half or five-eighths stick (high trim), to search for more concrete values for Cl While this would not be competitive in whatever throttle it takes, and full for all the section types at this Reynolds realistic conditions (the wings could not throttle (high trim) at full stick. By number! I will keep in touch about this take a full strength hi-start launch, for bringing in the throttle as soon as and maybe Blaine will perform more of example), it surely caused a lot of possible we are achieving a nearly his excellent experiments and provide interest and frustration amongst other constant rotor speed,for a longer period of time, thus giving smoother collective pitch changes. We are also getti ng better cyclic control on descents to landing because our blades are still turning near normal rpm, and because of this, we have less mixing (or tail rotor) changes to It’s What’s Up Front! worry about, since torque is staying more constant. We stated earlier that the perfect setup was to provide the best possible correlation of throttle and pitch. We’ve PUT AN H.B. ENGINE UP FRONT! covered half of the subject (throttle positioning throughout the full range of throttle travel). As we discuss pitch, keep in mind that no matter how the collec­ tive pitch is set up, the throttle arrange­ ment we explained always stays the same. We have to speak about pitch in relative terms, because pitch varies with each helicopter’s weight and the alti­ tude at which it is flown above sea level. For our examples, we will hover at +5° pitch, which will be half to five-eighths stick on the transmitter. The greater our collective pitch travel is, the more sensitive the feel will

•Perry Directional Porting become. If we fly from -3° at idle to +5° at hover, and+10° at full throttle, we are TOP PERFORMANCE on F.A.I. FUEL! likely to have a very sensitive helicopter H.B. Engines offer a full line of model engines, a complete when collective pitch is changed (13° choice of accessories and replacement parts. total collective). Going to the other Write tor FREE COLOR CATALOG extreme, if we have +3° at idle, +5° at hover, and +7° at full throttle, the HB-ENGINES helicopter will respond rather gently to Mod· in W Germany collective pitch changes. (Assuming we BAVARIAN PRECISION PRODUCTS CO. · P O Box 6. Dept C. New Canaan. Connecticut 06840 continued this trend, we would even­ tually have a fixed pitch situation where

80 R/C MODEL BUILDER lift is purely dependent on rotor speed.) Now, if we were flying full-size heli­ The “KIDS” Series ” copters, we could let the pilot add or decrease throttle as necessary to main­ tain blade speed in either of the above . for kids of all ages examples. Unfortunately, we have to depend on servo throws and work from arcs of the servo. What we end up with is that the first example (13°) will main­ tain a more constant blade speed than ■Champion the second (4°), the reason being that as we approach idle we want the least drag possible (say 0°) because less drag will allow us to maintain a higher blade speed. Two degrees pitch at idle gives higher drag and a slower rotor rpm. the exact situation we are trying to avoid. What you must do is experiment a bit K-2 Sonic Turtle and determine the most collective throw you can use without getting it too touchy. As another example, we were flying a setup last winter that had a good deal of collective pitch and nearly constant blade speed. It would almost Kit K -3 Luscombo Sedan fall out of the sky on full low throttle 7 . 9 5 ea descents, and we could "jum p" it off the pad to a hover. We flew it this way for a Wingspan 21" few weeks until we tired of the concen­ tration it demanded for precision hover­ ing. So we reduced overall collective throw by a few degrees and com­ promised blade speed and "hot dog" performance for ease of flying. An additional aspect of pitch is the amount of pitch below hover and the Kits contain: Die-cut Balsa Parts. Prof amount above hover. As we said before, Tissue. Clear Celluloid for windows. the number of degrees below hover Teaching Instruction Sheet. (i.e. -1° to +5°) will influence blade ^A/nte^o^com£lete^atalog^^62(UO^tree^^Wj»dijgW2^a^^O^ speed on descents and determine the quickness of the descent. Basically, you can determine what feels best for your largest pitch change you can without Engineering. For heftier grips, try to style and set it up that way. The degrees getting it too touchy. From hover to full locate some electrician's thin-blade above hover will be determined by the throttle, use the degrees of pitch that (cabinet tip) screwdrivers made by strength of your particular engine. If you your engine asks for . . . enough to Hunter Tools. Stock numbers 30320.1/8- have a wheezy engine you won’t want to prevent overspeeding, but not so much inch tip. and 30328. 3/16-inch tip. are run 10° of pitch at full throttle; you’ll that rotor speed decreases upon appli­ shown in the upper left of the picture. have to settle for 7° or 8° at that point. cation of full throttle. Less than $2.00 each. Above all. remem­ Conversely, if you have a strong engine To keep you thinking, we can also vary ber that the blade tip must fit the screw you’ll have to put enough pitch at the this blade speed-pitch sensitivity com­ slot exactly. top end to prevent excessive overspeed­ promise by using different typesof rotor In addition to screwdrivers, you may ing of the rotor disc. blades. Maybe we’ll look at that next want to buy some nut drivers and hex In regard to actual execution of what time. · drivers. The 3/16 and 1/4-inch nut we’ve just explained, the throttle and drivers in the center of the picture are collective pitch adjustments must be Fuel Lines . . . Continued from page 34 commonly used sizes. They're less than located independently of each other. In $2.00 each and they’re optional but nice. a )et Ranger, use two servos, one for and you’ll begin to get an idea of a few Hex drivers arealsooptional. Hunter has collective and one for throttle. In a Heli- of their many possible uses. Yes, but a nice fractional set of five for about Boy, use the linkage that allows the what about that dumb pieceof plywood? $12.00, stock number 12105C (5N-C). throttle rod to be moved separately of Well, pieces like that are great for the collective rod, even though they use cushioning the backplate surface of a the same servo. crankcase when you use a mallet to ftoctor H A R D W A R K Use servo wheels with many holes (a la initially free a crankshaft from a case, • WORKING TURNBUCKLES Kavan). Never use “ T” arms because etc. • RIGGING & CONTROL CABLE they don’t offer any flexibility using The final picture (No. 3) contains • CONTROL HORNS — . different arcs. If you can’t find a wheel practically all store-bought tools. First, · STRUT FITTINGS output arm with lots of holes, drill your let’s talk about the screwdrivers. A good • SHOCK CORD own, it’s not difficult to do. We’ve screwdriver is an absolute must! Unfor­ • COCKPIT TRIM . 3 included some sketches that show how tunately, a really good one is almost PULLEYS to make best use of the various arcs on impossible to find. There are a great »INSTRUMENT HOUSINGS the wheel for desired setups. Study them many screwdrivers on the market, but and you’ll know where to start from on just about all of them are junk. They’re your helicopter. junk because the tips are not hard send Si 00 lo In conclusion, open the throttle barrel enough, and they are not precision R o ilo r ENT. CORP. as soon as possible to get the blades ground. An exception to this is the set of PO BOX 9641 rotating as fast as possible at low throttle six small screwdrivers shown in the SAN DIEGO CA 92103 settings. From idle to hover, use the plastic case, about $5.00 from K&S

MARCH 1981 81 good auto parts stores. One or two to fit your engines are a must to properly grip small nuts such as those on car buretorsor needle valve assemblies. Another very desirable tool is a pair of curved nose forceps. They’re really great for holding wristpin retainer clips. Elec- tronic/radio shops have them. $5.00 to $10.00 depending on quality. Included in the picture is a bearing puller (lower left corner). If you have a rear bearing that’s stuck on a crankshaft you’ll need one of these. I’dsuggest that you hold off buying this tool until the need arises, then take your crank and stuck bearing with you to an auto parts store. They'll sell you the right size tool for about $5.00 or less. HOBBYPOXY FORMULA 2 DEVCON 30 MINUTE price S4.95* price $8.50* Those things that look like very thick- contents 9.7 oz. net weight*' contents 9 oz. net weight walled sleeve bearings in the bottom cost per ounce $0.51 cost per ounce $0.94 center of the picture are machined from aluminum. Tney’re used to drive ball That’s right! Hobbypoxy Formula 2 is almost bearings onto crankshafts. You can half the price of Devcon. So buy the epoxy glue make some from hardwood doweling designed for model building. Hobbypoxy Formula 2. also. I’ll tell you how to use another •Prices a s o l October 1980 "Du-Bro News * 3 1 " and HoObypoxy 1981 price llsi "A c tu a l weigM ol 8 fluid ounces makeshift tool in the future article on ball bearings. HOBBYPOXY PRODUCTS a division ol Pettit Paint C·.. Inc.. 36 Pine Street. Rockaway. NJ 07666 That about covers the tools you'll need to work on your engines, except Assuming you opt to use this amount of While you’re at Sears, look at the small for one which was not included in the money for other “ must” tools, you will combination “ ignition wrench” sets in pictures because of its disproportionate need some Allen wrenches as shown on either standard or metric sizes. Ten- size. This is a “ must” tool: a propane the upper right. They’re in the 504 range wrench sets are about $10.00. A couple torch. You can buy a propane cylinder at Sears and Roebuck. Buy the fractional of these small box and open-end and pencil flame burner for about $8.00 or metric sizes to fit the machine screws wrenches are shown on the right. Some at most any hardware store. of your engines. Sears stores sell them individually, as do There will be other things you'll need such as steel wool, toothbrushes, deter­ gents, WD-40, etc., but they’ll be dis­ cussed as needed in each forthcoming article. By now, you may have concluded that I really goofed by not including a single pair of pliers! You’re right, I didn’t! Intentionally! More engines have been abused by pliers than probably any other tool. After repairing literally thousands of engines, the thought sometimes occurs to me that the first tool many modelers grab is a pair of TH€ ONLY UIIW TO vise-grip pliers. An animated engine would have to say “ Ouch!” at the mere mention of pliers. Now, this is no claim to absolutely refusing to use pliers, such HANDLE CORNEAS! as needle nose, during engine work. Spedolly designed ujith the detail consdentous craftsman In mind, the However, the use is extremely judicious. DUAL 90° CORNER CLAMP handles those all important In fact, tweezers usually work better. corners uiith ease. find, takes the guess uuork away You might want to include a pair in your tool chest. by guaranteeing a 90 degree angle every time. Let’s close this engine tool review with Featuring a full V«* capacity, DUAL 90° some sources of tools and tool catalogs. COANEA CLAMPS can also be combined Sears and Roebuck Power and Hand to provide a variety of configurations. Tool Catalog (Free)

Brookstone Hard-to-find Tools (Free) ONLY $6 . 9 5 ii 127 Vose Farm Road (fi PAIR) Petersborough, NH 03458 Look for the DUAL 90° display at your Hunter Tools (Catalog 95000. Free) local hobby shop or contact PRNRV1SE, 3575 Hempland Road Lancaster, PA 17604

K&S Engineering (254) 6917 59th Street PRNRVISE INC. 2850 €. 29th St. Long Bnadi, Cfl 90806 U.SJI. (213) 595-7621 Chicago, IL 60638

82 R/C MODEL BUILDER Tools, Supplies & Equipment for Craftsman (Catalog 795, $2.00) Ernest Weiss Co. Jewelry Mart 607 South Hill Street Los Angeles, CA 90014 — I suggest writing for each of these catalogs. Don’t cross off the last one because of the $2.00 fee. It’s a superb catalog. Be sure to ask for a current price list with this catalog. Next month, we'll start taking engines apart. · *I

Sport Scene .. Continued from page 47 an O.S. Max .15. Hurst seems to have a HOBBYPOXY FORMULA 4 DEVCON “ 5 MINUTE” limitless supply of these magnificent price $2.75* price $1.98* models tucked away! I suspect that he contents 2 oz. net weight contents 1 oz. net weight could triple the size of Flyline's catalog cost per ounce $1.38 cost per ounce $1.98 (if it were judged financially feasible) without having to design anything new. That’s right! Dollar for dollar, Hobbypoxy gives Our final photograph this month is a you 44% more glue than Devcon. So buy the best— really neat product you should consider. the epoxy glue that never gets brittle. Hobbypoxy. I have, use, and enjoy my Dremel tools, •Prices as ot October 1980 Ου-Bro News # 31 " and Hobbypoxy 1981 price list but one accessory in particular has been a problem. The small, abrasive cutoff HOBBYPOXY PRODUCTS » MI u tl P«tft M l Co.. Inc.. 36 pm· SUM. Rockmy. KJ 67866 wheels they sell are brittle. 1 think they are even dangerous if you fail to use eye protection. To the rescue comes House new Polecat, as he found metal on the of Balsa with its "Tuf-Grind” grinding Pylon...... Continued from page 17 runway just after rounding No. 2 pylon. wheels. These are some sort of carbide Other crashes in between, and last but impregnated fiber laminate which just everyone, but coupled with Murphy’s not least. Bill Hager certainly must have a won’t break. Don Dombrowski demon­ Law and dumb-thumb brain fade, in two feeling now for the number 13, as he strated their capabilities to me by cutting days the lucky (?) number of 13 was ended all of the gods’ tricks on Form I through a 3/8-inch drill shaft. You can taken from the ranks of the 45 models pilots in the last flyo ff heat in the cut with the edge or use it to shape and that started, jim Maki’s beautiful Pole­ contest! All of the goodies (few) were grind on the face. You still better use eye cat, which won the best finish award at extracted from the sweepings of these protection whenever you use any power the Nats, is now sleeping with the gods. overly rekitted planes and will emerge tool, however. Any high-speed tool will Dennis O’Brien’s brand-new gold leaf again to do battle in another brand-new throw grit, and even your workpiece if Polecat with airbrushed murals had an bird. mishandled. The way you find out that it encounter of the other kind with Bob Old racers never quit, they just goon is mishandled is if it is thrown, and then it Violet’s Polecat at pylon No. 1. Two and on and on. On Saturday (Sunday was is too late to put your glasses on. Any­ Polecats coming together don’t make a a gentle day) this writer, on the line way, these wheels look like a genuine Polekitty. No victors! Bill Williamson taking photographs, witnessed three step forward in modeling tools and have with his brand-new super LR-1A is still planes make a beautiful takeoff, when a wide variety of possible uses. scratching his head, trying to overcome suddenly, about three feet off the Larry Renger, c/o RCMB, 621 W. 19th the gravity of pylon racing. Bruce Rich­ ground, two were directly replanted St., Costa Mesa, CA 92627. · mond must have built-in magnets in his back on their landing gear, as abruptly as t***#***#*******'**'****'** **■»»*»**» W K w w ♦ * * NEW MATH? * * 2+24PPP It’s CASS ENGINEERING'S new 2 + 2 * Super Drive that equals one Potent Power Package! * Available for most engines .25 through .91. Twin, horizont­ * ally opposed, alternate firing smooths out power impulses * * for low vibration and long belt life. Reduction of 2:1 for * large, high pitch props. Ball-bearing output shaft, tempered aluminum casting. * DIMENSIONS OF ♦ UNIT SHOWN, USING The CASS 2+2 Super Drive will fit ♦ O.S. MAX .40 FSR ANY power NEED!! * ENGINES: Price: .25 thru .4 5 ...... S99.50 + L = 4 -3 /4 " + W = 6 -3 /4 " .50 thru .9 1 ____ $109.50 * H = 4 -3 /4 " (Engines not included) W t. less engines * 13-1/4 oz. If your dealer cannot supply, order direct * * CASS ENGINEERING, Box 420, Rutherford, N.J. 07070 (201)438-2897 939-7766 * *

MARCH 1981 83 BARRONS SCALE CLASSICS 5) Brian Richmond ATTENTION 1/4-SCALERS! PLANS WITH CONST MANUAL 6) Dave Pearce 7) Bill Grove -♦SPORT SCALE^T ITS FINEST — EPOXY GLASS COWLS for: 8) Laird Owens NOSEN -S ID MORGAN - PICA - CURTISS HAWK P6E $12.50 9) Glen Sicotti CURTISS GOSHAWK FI I f 15.00 BALSA U.S.A. - PLATT - CONCEPT 10) Bob Wallace CURTISS GULFHAWK ΙΑ $ 15.00 11) Bob Reuther FLEET - HOSTETLER - RCM 2 IH S C A L E < 3 IN S P A N 12) Lew Hipkins TAYLOCRAFT - BYRON/SHEBER STINSON RELIANT SR9 $15.00 13) Dave Latsha PITTS - FOKKER D-7 - BOEING 2IN SCALE β«ΙΝ SPAN PLEASE ADD $2.00 FOR P/H 14) Robert Schuster P-26 & F4B-4 - GEE BEE MOD. Ύ - 15) Bill Hager KRAFT SUPER FLI 1/3 & 1/4-Scale ALSO AVAILABLE IN 1/4 SCALE 16) Gary Hover SEND $1.00 FOR COMPLETE; AND OTHERS. INFORMATION TO— - 17) Bill Preis Send S.A.S.E. for complete lift. RICHARD G BARRON 18) Ken Hulik T & D FIBERGLASS SPECIALTIES 1213 HOLLY SPRING LANE" ” 19) Tom Nay 20) Gail Jacobson 30925 Block, Garden City, Ml 48135 GRAND BLANC. MICHIGAN 4B439 Phone (313) 421-6358 R/C Cars . . . . Continued from page 37 Castellano, 4th Gary Hover, and 5th they took off. More zeros-ville. Shortly Dave Keats. have so completely taken over in R/C after this, there was a pilot’s meeting to Much too soon, the following morn­ car racing. While at it, he also revised a decide whether to continue or wait for ing came with the usual grunts in the couple of other sections, as well as the wind to subside. Now I ask you, have motel hallway, "See you at the field." adding a few comments about R/C you ever seen a Form I racer quit? The Once again everything became stone vehicles just recently released. race went on. This is not to say all was sober. .. full race!... go for it! It’s now So, to pick up what I regard as an bad. Contrary to what it sounds like, or never! Another great day of Form I excellent book on R/C cars, ask at your only some (13) had bad luck. Others had racing. The good side of Mother Nature. shop or raceway for Model Car Racing. Lady Luck, skillfully piloting their air­ A perfect day. All day! The pits scream­ If not available, write to Chilton Book craft, heat after heat, landing after ing with the exotic sound of Form I Company, Radnor, PA. The book costs landing, knifing through the wind, all engines and undertones of “ Did you see $5.95, including another $1.00 for post­ day Saturday to race again on Sunday. me pass him?" ... "I knew I could go age and handling. And, yes, that is the After Saturday’s racing, the victors (all fast, if only I didn’t have two zeros." ... complete address for C hilton.. .Radnor pilots are victors, only some planes "If I keep this up, I will be in the top must be a very small tow n... remain at rest) returned to the Ramada five." . . . “ Who cares. I’ll get them NEW DIFF FROM THORP Inn for the yearly evening banquet and next year." .. . "Why didn't I turn the John Thorp now has available a ball- presentation of awards to the top five switch on my glo plug driver?" ... "I type diff designed especially for the point leaders for the year and the best could have won that heat." . . . and the Associated RC300. I have one and it is finished Form I of the Championship soundless prayer of Tom Christopher, installed on our RC300, but we have not race. It began with the usual bending just one more time. And Tom Christo­ yet run the car with the Thorp diff as of of elbows and ears, followed by an pher emerged the number one NMPRA this writing. All I can say for sure is that excellent meal of great variety, leading Formula I racer for the 1980 Champion­ the Thorp diff did go on the car a lot to the awards of the evening. The best ship. It's all over for another year. easier that Associated’s own gear-type static finish award was given to Dave The top 20: diff. In the pure conjecture category, I Latsha for his Polecat, follow ed by 1) Tom Christopher suspect that, compared to the geared awards given to the top year-end point 2) Greg Doe diff, the limited slip adjustment will be leaders. The first five were: 1st Dave 3) Dave Shadel easier, the setting less likely to change, Shadel, 2nd Tom Christopher, 3rd Tom 4) ]ohn McDermott and that overall reliability will go up. Best news is the price: only $85.00, ready to go on the car, including a pair of Tatone Makes it Easy Thorp rear wheels, mounted with ready- to-race, trued rubber. I have had really E s ta b lis h e d in 1956. Tatone h a s in v e n te d or d e ­ excellent results with the Delta ball- signed over 300 specialized model airplane ac­ type diffs, so if you are considering cessories. often imitated, but never equalled. adding a diff to your RC300, John Thorp Watch for more new items. might just have the item you need. John also has a new 1/12-scaleelectric car rolling chassis, fitted with ball bear­ ings all around, his own diff, glass chassis, aluminum power pod, and so on. I'll have more about the car in next month’s column. In the meantime, for more information you can contact Thorp Manufacturing, 380 South East End, Unit H, Pomona, CA 91766, or call (714) 622-6518. · I

Pattern...... Continued from page 29 T'T'-r1 I look to see some strong evolutionary Tatone products are available at all leading hobby shops. work in the next few years, if the trend See your dealer first. If not convenient— ORDER DIRECT. toward more complex maneuvers con­ S e n d 50C for illustrated price information. tinues. For the present, I still feel that COD. VISA. MASTER CHARGE accepted.______light weight and neutral flight charac­ teristics are the most important factors in TATONE PRODUCTS CORP. design. 1209 Geneva Ave San Francisco. Ca 94112 1415)3347189 Enough daydreaming, now let’s take

84 R/C MODEL BUILDER uality, price and performance that can’t be beat! The Mantis from American R/C Helicopters is the innovation of the 80's - a helicopter that has something for everyone. WSmooth and stable, the Mantis is easy to hover and fly for beginners, yet capable of very exciting flight for you experts! Made of readily available materials, that allow quick and inexpensive repair, you'll find that this is one helicopter that "keeps on giving!" .40 powered, the following features are offered:

•LIGHTWEIGHT & 4 i l O . O O • 4 to 6 HOUR ASSEMBLY TIME φ l * V 7 • EASY SET-UP AND TRIMMING • CO M PR EH EN SIVE MASTER PLAN - Complete with photos and easy to follow instructions • USES A CONVENTIONAL .40 ENGINE (Not Included) No Schnurle Engine Required • C O N TA IN S N O M ETRIC PARTS — Spare Parts Are Readily Available! • FLYS W ITH A 4 -C H A N N E L R A D IO SYSTEM (Not Included) For additional product information please send $1.00

Other fine Helicopters from American R/C: (Ail use 4-Channei Radio System - Not included) REVOLUTION I REVOLUTION II COMMANDER .40 powered trainer .60 powered .60 powered, fully aerobatic. with fixed pitch. with fixed pitch. Available with or without Metal construction. Metal construction. Autorotation! $239 $279 «

DEALER & DISTRIBUTOR INQUIRIES INVITED A m e r i c a n For Further Information Call or Write: (714)744-7533 IS. Ill 635-11 North Twin Oaks Valley Road · San Marcos, CA 92069 available. The most prevalent mistake in this ΟΛΝΝΟΝ F 11 IRST m maneuver is a failure to insure that the m e S Y S T E M S 1 wings are exactly level prior to each turn and immediately after each turn. If you WORLD’S SUPER-MICRO! fail to hold the wings level, the headings SMALLEST SERVO, Rx & COMPLETE R/C SYSTEM will definitely wander. Use rudder, not aileron, to hold wind drift if at all . P· SUPER-MICRO Servo, .47 oz., 29/64 x 31/32 possible. An exception to this is that you ^ - X 1 -3 / 3 2 ", 15 oz . - i n . thrust. Works with most can slightlytilt the wings on the climbing all positive pulse decoders. MICRO Rx (4CH . portions to counteract side drift from a max.), 19/32 X 7/8 x 1-9/16", weight .54 oz. crosswind. This will point the plane into (2 CH .) (5 CH . uses larger MINI Rx). FIite the wind when you pull to horizontal if packs compatible with Tx of most other mokes. you tilted the wings the correct way. ITEM SYSTEMS FLITE PACKS Correct immediately to level the wings. This may sound tricky, but if you try it a 2 C H . $234.95 $169.95 ( 2 .9 o z .) few times you’ll like it. 3 C H . 292.95 2 0 7.50 ( 3 .3 9 o z .) Next month we will try to hold our discussion to flying. Thanks for being a 4 C H . 349.95 244.95 ( 3 . 8 8 o z .) good listener. 5 C H . 359.95 247.95 ( 4 . 1 6 o z .) ’ Dick Hansen, 5269 Lucky Clover Lane, Murray. UT 84107. · 1 *SERVO $ 4 7 .5 0 MICRO RX $ 8 9 .9 5 (4 CH.) *Micro or Dean's plug; others $2.50 éxtro. 1 to 1 Scale .. Continued from page 11 SHIPPING: Systems - S6.50; FI ite Pocks - $4.50; Servos or Rx - S3.00. 20% deposit required on C .O .D . orders. Calif, Certainly this has got to be one of the residents odd sales tox. Brochure - .5 0 U .S ., $1 .50 Foreign. most exotic aircraft ever built. Don’s 13400-26 Saficoy Sir*·! North Hollywood. Calif. 91605 Phon· (213)764-1488 version is 1"=1’ scale. This results in a model some eight feet long, with a 55.5- a new maneuver and look at it closely. Don’t wait for the count of twelve inch wingspan. THE SQUARE HORIZONTAL EIGHT before this last corner! Start counting The other particulars of this effort Look at the sketch and read the rules again and push to a vertical climb on the include two K&B 7.5 engines turning in the book. We start this maneuver low count of three and again to level flight Midwest fans. The estimated weight (50 feet) and look for a reference point on the count of six. If all goes well, at the upon completion is 16 pounds, to be for the center. Try to hold perfectly still count of nine you will be back at the carried by some 1800 square inches of and move only your head when follow­ center and ready for the quick power area. The structure that you see in the ing the flight path. This will help keep cut and a vertical dive. Recovery is again photos will be covered with a balsa skin, the loops oriented and equally sized. at the starting altitude. The reason for then two-oz. and 3/4-oz. cloth. Rhom Try counting to yourself slowly (one- the counting is to give you a comparison retracts have been installed and Don thousand-one etc.) as you pass the of size vs. time on each leg of the expects to use eleven servos to make center of the judges’ view. On the count maneuver. If your plane has bad ac­ everything work. of three, pull up and climb vertically till celeration you had best keep thecorners Don has completed some excellent the count of six, then pull to inverted and wide and try for a smooth look . . . also documentation for the project, and cut power quickly to low throttle. At the keep the speed up. If possible,always go without a doubt, one quotation from the count of nine pull into a vertical dive and for the largest size maneuver you can fit material fits the SR-71 beautifully. It is when you reach the starting altitude, into the frame. The limiting factor is referred to as "menace personified." push to inverted and apply full power. usually (you guessed it) low speed thrust We’ll look forward to filling you in on later chapters of this story. MORE STUFF AND THINGS lust a profound “ thank you” to the number of people who have written over the past year, letting me know that these monthly excursions into whatever it is that we do have been enjoyed or useful. I was especially interested in the several who took time to write about the manner in which we covered the Ottawa experience. Another thought of interest was the volume of mail that came concerning Skip Mast’s C-130. There must be a bunch of people out there with a lot of spare engines and a balsa wood jungle in their backyard. At any rate, thank you for your concern and support. η Γ Λ I I C \ l i f SCALE ACCESSORIES A POINT TO PONDER Every now and then a thought surfaces l\L/ALIOIVI· BY WILLIAMS BROTHERS in the scale community concerning RADIO CONTROL SCALE PILOTS · SCALE WHEELS some of us who continue to campaign CONTROL-LINE CYLINDERS · ENGINE KITS · MACHINE GUN KITS the same old precision scale models year after year. Generally, when this thought FREE-FLIGHT PLASTIC DISPLAY MODELS is expressed it is followed by the state­ ment that "there ought to be a rule . . . " SEND 50f FOR COMPLETE ILLUSTRATED CATALOG You know, one win and out, no more J ^ ÍR U A M I) DEPT MB than two years, etc., etc., etc. ^ 8 8 0 5 , in c > - . 181 PAWNEE STREET, SAN MARCOS. CA. · 92069 I suspect that it’s natural that I tend not

86 R/C MODEL BUILDER to subscribe to the idea. I'm confused what do we do with the rule then? because the reason that is often given is Well, so much for emotion. The name that new models need to be infused into of the game is competition, and that is the system. Why this might be true is a building a better mousetrap and using it : * Join us in**: mystery to me. Surely it can’t be that better than your competition. All you do someone has created the ultimate model is build a better model than the one that and nobody can possibly win against it. If the other guy is currently winning with. a model is competitive, the time element When one looks at the continual and BEAUTIFUL RENO ever-escalating evolution in the scale should be of no consequence. When the • AWAY FROM THE SMOG · better model comes along it will win, field, you’ll never convince me that period. I suspect there might be one phasing out models will not happen • AND BIG CITY PROBLEMS!! # somewhere, but I can’t think of any naturally when they are no longer competitive sports or hobbies that rule competitive. The argument that limiting CIRCUS HOBBIES, INC., the top competitor out because he or the competitive life of a model would she is still winning. Let's see; Pittsburgh bring new models into the system at a • importers o f the famous JR · won the Super Bowl last year, therefore faster rate, is suspect to me. How many • radio control systems, IM Pro- · they are required to start over with a persons are there who are willing to put • ducts, Graupner Products, and · new team this year. The golfer and his several years of research and a couple • other prestigious hobby items, _ clubs, the bowler and his bail, the dog more building a model, knowing that if owner and his pet pooch, or the car it wins a contest or so it must be shelved, is seeking the services o f a owner and his 1920 Whatchamacallit. never to compete again? That’s a whale knowledgeable and technically Aside from the fact that it takes a year of an investment in time, energy, and • oriented modeler who must be · or more to creat a new model for money. • fluent in Japanese and English, · competition, there are some other Lastly, it seems to me that when I hear ironies in the suggestion. Frequently, this comment concerning limiting the • both lay and technical terms. m scale modelers are accused of not competitive life of a model, it most often No preference as to sex, but knowing their models and that they are comes from either (A) persons who have applicant must also be willing unable to fly them well because they never built one for competition, or (B) • to w ork in our sales dept. · don't know them. Perhaps we should persons who like to watch them or take say to our pattern brethren that they pictures of them. • If you fit these require- · must change models each year because Then again, I might be (A) all wet, or • ments, please send us your · they are getting too good with the (B) too prejudiced. Anybody want to _ resume at once. _ model or style they have been using. sound off on that? A second irony that occurs stems from HAVE YOU TRIED? the fact that whenever I read about this Your local hardware store will likely concern, it is applied to Precision models have an assortment of flexible sanding only. If you look around you'll find a siz­ pads that help knock off those high spots able number of models that have been that creep into your building. They mold • Box 5215, Reno, Nevada 89513 campaigned for quite a few years. nicely to the contour of an airfoil and ··········· Perhaps those who would like to limit curved fuselage side. Some are rather Buy a package of spring type wooden the competitive life of a scale model thick and not as flexible as I'd like, so I clothespins for your wife and then would wish to include all scale models? slit them in half and thin them down a borrow some for your workbench! They Also, you’ll discover many modelers bit. make dandy clamps, but remember to who specialize in building a specific Looking for a long, straight sanding put a scrap of wood over the parts to be model subject more than one time. This block? Try the bottom surface of a piece clamped to not only help distribute the occurs not only in the kit field but of cabinet door track. You can buy a roll pressure, but to make sure you don’t scratch-built area as well. Come to think of sandpaper and contact cement it to dent the important surfaces. And don't of it, when a modeler shows up with his the aluminum. It’s great for truing forget that they can be trimmed into Widget 10 and relates that it is not the leading edges that have wandered too custom shapes very easily with your same one he campaigned last year. far out of plumb. handy model knife. Your best Defense is to Own One! It's actually somewhere near demoralizing to your opponent to have the hot snarl of a Fox “Combat Special" closing the gap. That's good, a worried flyer flys worse. Fox "Combat Special" MK-IV's are in business to chew sluggish crepe streamers.

Ball Bearing FOX Schnuerle “COMBAT SPECIAL” MK-IV #13799 $59.95 An optional “Slow Combat" type needle valve assembly and intake restrictor may be installed to fly in that event.

5305 T0WS0N AVE Close as your phone: FØX FORT SMITH. ARK 72901 I501' 646-1656

MARCH 1981 87 GLEN SIG MEMORIAL PATTERN MEET MARCH 14TH & 15TH, 1981 103rd Street Sports Complex Jacksonville, Florida FLYING STARTS AT 8:00 A.M. Pre-Novice — Novice — Advanced — Expert — Masters Plaques Through 3rd Place Presented by GATEWAY R.C. CLUB Sponsored by NORTHEAST FLORIDA FLYING MODEL COUNCIL

For more information call C.D. Burnis Fields (904) 388-8662 or (904) 389-3572 602 South Edgewood Avenue Jacksonville, Florida 32205 AMA SANCTION N0.6

You say that your building table is over inch-thick piece is fine, maybe two or As we look at subjects like Tom Cook’s the hill? Check that local lumber yard for three feet square. When you get down beautiful F-4 twin ducted fan project an interior hollow-core door. Don’t buy to the final sanding period, place it on and consider Don Allen's SR-71, we a first rate, brand spanking new one your workbench to prevent building in realize that the parameters once set for because almost always the yard will have creases, dents, and the like. An old the hobby/sport havedissolved and that a second or two hanging around that throw rug can help too! the horizons beckon from a distance. they will sell for a buck or so. Check to AND ON TO ’81 The longing look at some types of air­ make certain that they are true, straight, As we begin a new year we can look craft that at one time might only reach and flat. Also make certain that they are forward to a continued expansion of the the dreaming stage can now be brought true wood and not one of the wood sub­ wonderful world of R/C scale. New to fruition. stitutes of a masonitetype,since you just trends and challenging subjects help to Events, both formal contests and the can’t push pins into some of them make it so. Kit offerings are reaching less complicated but most satisfying fly- (unless you are King Kong). The "table” very highly sophisticated levels, making ins, continue to multiply. They have be- will last for several years, and remember, it possible for modelers of even moder­ come well-thought-out and well- there are two sides to use. ate experience to produce a super attended programs that serve to whet While you are in the same store, pick model that will fly well and satisfy every not only the appetite of the modeler but up a nice big piece of soft foam. A three- need. the general public as well. The Southern

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88 R/C MODEL BUILDER NEW! THE M.E.N.“BIG JOHN 55 of squaring, straightening, and holding parts in BY BILL NORTHRUP relation to one another revolutionizes construc­ Big Joftn," a big easy building biplane from the tion in lite plywood workbench of Bill Northrup Designed back in BIG JO H N is designed for four channel radio 1963 Big John is a proven design and proven control operation with 60 to 90 model engines performer with over 2 thousand sets of plans The 76%'· wing span combined with 8% lbs flying having been sold since its introduction M E.N.'s weight gives a wing loading of 13 ounces per kit simply updates this classic, with modern square foot building and construction techniques, designed The kit features T H R U -C U T die cutting, quality to create a stronger, lighter, easier to build model materials, rolled plans, building instruclions. wing Weighing in at only 8% to 9 lbs. complete this is |ig building fixtures, complete hardware package, one big mode» that really can perform on only a pre-bent landing gear and cabane strut wires 60! Quoting Bill Northrup. "This biplane will do Building time for the BIG JO H N is 25 to 45 hours |ust about any maneuver if you don't mind wait­ The following items are needed to finish the ing a little while for them to get completed'!!! model 2 -4 % " wheels. 1-1 % wheel. % , wheel col­ A great exhibition airplane " lars, Y„ wheel collars, a 12-16 oz fuel tank, fuel M E N 'S kit engineering was specifically line, throttle cable, elevator and rudder pushrods. planned for fast, easy building Our "T H R U -C U T " glue and covering material die cutting combined with "T R I-S Q U A R E -L O C ‘ construction of lite plywood and balsa makes construction fast and simple The Inherent *129“ strength of lite plywood construction provides durability and lasting performance M.É.Ň. Available from you TR I-SQ U A R E-LO C enables us to bring to you Model Engineering of Norwalk local dealer the best in lite plywood construction, this method 54 Chestnut Hill · Norwalk Connecticut 06851

REVOLUTIONARY NEW CHARGER C-50/4 M.E.N. Now after I Vi years of development and charge or how long lo charge Just plug testing. M.E.N. Inc confidently intro­ the system in and leave it on till you're AUTOMATIC R/C duces its revolutionary C-50/4 Auto­ ready to fly again matic Pulse R/C System Charged It Is Second, many battery tests can be SYSTEM CHARGER unlike any other charger you have ever done with the charger For example, you • Extends the lite ol any nicad! used. II is not a DC charger but a can test for open battery cells, shorted • Extends the capacity of any p ulsed charger and therefore operates battery cells, hi-leakage cells, low ca­ nicad! differently giving different results By pacity cells and hi-impedance cells. AH suitable control of pulse height and conditions that can, if not detected early, • Adds reliability to nicads never pulse rate, charging of your batteries is lead to disaster before achieved by any charger! accomplished In addilion to the out­ The new M E N. C-50/4 charger is • Restores marginal batteries to full standing battery reliability produced by available in 3 models to cover all R/C power potential! the charger, several side benefits occur needs. 4 8 votts/9.6 volts. 4.8 volls/6.0 $3995 • Batteries can be left on charge First, batteries can be left on the volts, and 4.8 volts/12 volts. All are ca­ indefinitely without damaging charger indefinitely. That simply means pable of charging systems ol 240 cells. that after a flight session you can put M A H through 4 amps hour capacity your R/C system on charge and leave it The new M E N. C-50/4 Charger rep­ • Fast charges—automatically! there until you're ready lo fly again, next resents the latest state of the art in MEN. • Renders all other chargers day. next week or even next year—no battery chargers No serious R/C en­ Model Engineering of Norwalk obsolete! need to ever wonder about when to thusiast should be without one!

California Scale Squadron through the turn base, final turn, level out in a quickly learn one more thing about a hard work of its membershipand several perfect glide path to touchdown right in Quadra. It WON’T run when it's wet. other clubs around the country, have front of us. Ten feet high, start to gently The ignition system must be totally dry produced a viable, workable plan for flare . . . three feet, flare a little m-o-r-e before it will run, and that means a total national competition. Their expansion . .. one foot, m-o-r-e back . . . six inches, teardown and blowing out. Spark plug, of the idea in 1981 bodes well for all FULL back, and from six inches plop plug lead, coil, and points must be com­ modelers, whether they be viewer or gently on in, as pretty a full-stall splash­ pletely blown dry, and the engine competitor. This year they will end with down as any full-scale pilot ever did. completely blown free of any water in a tournament in Kentucky. (Applause, “ Aw-right's," "Thas purty- the crankcase and cylinder. Not at all As the scale snowball lumbers on, purty’s.’’) Stuck-up pilot, condescend­ difficult, but definitely necessary im­ each of us involved in the scene can only ing smirk on face, chest expanding, mediately. hope that we can maintain the enthusi­ pushes throttle forward and eases off the While Ken and I tended the drying asm and purity required to keep scale up-elevator to “ show the troops how it’s out, Paul fired up and taxied out. It was growing. Whether it be competition or done again." immediately apparent that a water sport that our scale efforts are directed Spray flying, up on the step, (pilot's rudder is an absolute necessity on these toward, let’s resolve to keep it an inter­ sneer widening), high speed, rocking big birds. Even on a calm day like this, esting, challenging portion of the gently forward, full power now, float Ken’s L- 4 was totally unresponsive to the hobby/sport. forward sections touching, really moving air rudder. It went straight, period. Bob Underwood, 4109 Concord Oaks now . . . KERSPLASHU! A terrific geyser Paul's Champ, with a nice big water Dr., St. Louis, MO 63128. · of flying water completely obliterates rudder and no float sub-fins, turned very the plane! WHATTHEH— !! nicely within its own wingspan. When the spray clears there is the After taxiing around a bit, checking Giant...... Continued from page15 ridiculous vision of the plane floating out the water handling characteristics, been one to baby a plane, and a Cub, perfectly straight up on its nose, sup­ Paul turned into the wind and added doing bang-around-the-sky maneuvers ported by the wing and the float tips. power. He added power in several steps, at scale speed is just plain pretty. Loops, Total shock registers on pilot’s face, with the result of one of the prettiest, rolls, stall turns, snap rolls that turn into color drains out, chest deflates explo­ slowly accelerating, spray-flying takeoff spins after about 1-1/2 revolutions (same sively (pride goeth before a fall!), and runs any model has ever made. The as the real thing would do) . . . not the after a few seconds, he whimpers, floats could be heard slapping the slight kind of flying some white-knuckled "What did I hit?” swell, and after about a 75-yard run, a student would do, but definitely within "Nothin’, you turkey, you just forgot little additional up lifted the floats clear the full-sized plane’s capabilities in the to hold up-elevator, and the float tips of the water. The Champ, water stream­ hands of any aerobatic pilot. dug in!” Long silence. “ Oh." ing off the rear of the floats, climbed out Anyway, after this tomfoolery, it was A quickie retrieval and inspection to another picture-perfect test flight. time for the icing on the cake. A touch- reveals no damage whatsoever, and just Neither Ken’s nor Paul’s plane required and, oops, 'scuse me, SPLASH-and-go. a little water in the cabin. Of course, the the slightest change on these flights, Wheel onto downwind, reduce power, engine is totally waterlogged, and we with the exception of a little more up-

MARCH 1981 89 rTALK TO THE EXPERTS

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S.C. MODELER 1 ØM Larkin Avenue. Elgin. Illlnolt 60120 New Jet Ranger elevator trim on Paul’s. Post-flight inspection after that super- shower of sunlit diamonds as the plane After the obligatory feeling-out and hard bounce showed absolutely no slows and slips off the step. The shower camera passes, it was Paul’s turn to show problems at all. This was mute testimony slowly subsiding until the plane is just how it's done. Set up on downwind, to the ruggedness of Paul’s floats, his gliding peacefully through the water at a base, final, onto the approach just right, mounting system, and to his highly tick-over idle with all the grace of a just a little steep and fast, "Gonna be a refined modifying of the basic Nosen kit. white swan on a lily-pad pond. long flare-ou ... "KAWHAMI! “My It was also a dramatic statement of the Then the roar of power, heavy spray God, she’s 20 feet high again!” forgiving nature of seaplane flying. Had flying until the plane climbs up on the "POWER!!” "Hey Paul, you fbrgot to the same kind of impact happened on float steps, delicately balancing there, flare!” "You’re telling ME!” land, the gear would have probably climbing to flying speed. The spray here The next approach is a whole bunch been left on the end of the runway, and becomes a gossamer veil shooting side­ more cautious,and is perfectly executed. other structural damage. With floats, ways, sparkling as the drops shatter the Taxi back to shore and slightly gunning the plane was just catapulted back into surface behind the plane. After the the engine at the last second gently skids the air. floats gently part company with the the floats about halfway up onto the After having both provided me with a water's surface, water streams off the sand. tremendous amount of entertainment rear of them, sparkling diamonds that on their respective first flights (remem­ dimple the lake surface long after the ber, my bird wasn’t finished yet, so I liftoff point. The effect is that of water wasn’t in a position to offer them re­ softly letting go of the plane, then venge), Ken and Paul settled down to tenderly waving "Good-bye . ..” some serious fun. Ken’s model dried out A beautiful day, a beautiful lake,three with no problems, and he resumed good friends, two magnificent planes in flying. Both guys started showing what total isolation without a single political good pilots they really are, and I spent consideration in the entire world. No the rest of the afternoon watching and flying site problems, no hassling neigh­ photographing scenes that would bring bors to worry about, no frequency tears to the eyes of even the most hard- problems, no aircraft trouble, and just to-please modeler. enough hilarious mistakes to add spice All I can say is that you should have to the day. Absolutely spectacular late- been there. A jewel of a lake reflecting afternoon light turning every spray drop miniature aircraft making long, graceful into a sparkling diamond, and the lake takeoffs and touchdowns, one after the surface into a shimmering mirror. The other. The mirror surface of the lake day finishing up in totally successful being gently creased by the float-tails flights, and a tired but thoroughly happy tip-toeing onto the water, followed by a group taking all planes home intact long, graceful slide culminating in a without repairs to be made. Modelling distilled down to its purest, most enjoy­ able form. By far the most totally AuthorizecT FA CTO Ft Y A UTHOFtIZED SER VICE enjoyable, satisfying day’s modeling that FOR ALL OF THE FOLLOWING BRANDS I have had in the last five years. . . Even if IR adio that fellow Runestrand did finally hand Ace* Kraft* Pro Line* RS Systems* me his transm itter only 30 seconds C^ontrol Aero Sport World Engines Orbit Royal before the engine ran out of gas on the Cannon EK Logictrol Mathes* Simprop* last flight of the day! S e r v i c e Cirrus Micro Avionics MRt* Jerobee ★ ★ ★ Flying seaplanes is a refreshing change •ALSO W ARRANTY SERVICE of pace from our normal flying, and with a little thought, most of the planes we 4 A EXPERT SERVICE FOR ALL BRANDS are flying today can be modified so that Factory trained technicians with over they can be flown either way, simply by Don McCarthy switching back and forth from wheels to 15 years in Radio Control Electronics. floats. For most planes, the wheels can HOURS: be removed from their axles and floats Closed Sun & Mon — Tues: IOam-8 pm, Wed—Fri: 10am-6pm; Sat: 10am-2 pm attached on those axles. A rear mount (714) 639-8886 941 N. MAIN ST., ORANGE, CALIFORNIA 92667 then goes from the float rear attach point to a mount on the fuselage. There

90 R/C MODEL BUILDER are literally dozens of different methods of doing this, so I have to leave this up to you. An entire book would be required to detail these. When you mount your floats, regard­ less of method, only three things are really important. First, the float mount must be rigid. "Shock absorbing" float mounts that allow the floats to wobble will cause extremely poor water perfor­ mance. -NEW- Second, the float angle is important. HEAVY DUTY ELECTRIC RETRACTS With your floats sitting on a hard surface, • LIFTS A 4” WHEEL ON AN 8" STRUT (C*ntef-To-C«nter) resting on the steps and tails of the floats, • HEAVY-OUTY SUP CLUTCH. PREVENTS JAMMING the airplane must be at slightly more • LARGE TRANSMISSION GEARS than a normal takeoff angle. This will • 3/16" W IRE S TR U TS •WILL HANDLE WEIGHT OF AN 11 TO 20 lb. AIRPLANE normally mean that with thewing chord­ • SLOW. SCALE TRANSIT TIME. 5 SECONDS line at 0°, the float centerline (water • POSITIVE MECHANICAL UP AND DOWN LOCKS line at rest) will be 2-3° negative, orfront GMP 230 Three-gear t e r ...... Si 1995 tips down. If this angle is too flat (float GMP-231 Tvvo-gear set...... $89.95 tips too high), the plane will not be able GMP 232 Nose gear only...... $4300 to rotate enough on the float steps to get (Above price includes retracts only) to takeoff attitude. If it is too great, then CHA RGfc1 the fronts of the floats hang down, look­ ing bad and causing poor aerodynamic GIEZENDANNER SOUD STATE AMPLIFIER effects. (SWITCH) $ 3 9 .9 5 Third, the float step should be one to • LATEST 1C SOLID STATE CIRCUITRY • ALLOWS USE OF SEPARATE BATTERY SUPPLY two inches ahead of the aircraft C.C. Too • ELIMINATES ADDITIONAL SERVO. SWITCH. OR far forward, and the plane will be skittish HARDWARE and directionally unstablewhenrunning • PLUGS DIRECTLY INTO RECEIVER AUX. CHANNEL • CAN BE ORDERED FOR POSITIVE OR NEGATIVE on the step at high speed. The plane will PULSE INPUT SYSTEMS tend to waterloop. Too far back, and it • CAN BE USEO AS A GENERAL PURPOSE ELECTRONIC SWITCH FOR LIGHTS. ETC. requires excessive up elevator to keep • NO RF INTERFERENCE the front float tips from digging in, as • ONE AMPERE SWITCHING CAPABILITY • SM A LL SIZE (1-9/16 x 1-3/16 x 15/16 in c h «) Ken’s did on his second takeoff attempt. WRITE FOR COMPLETE RETRACT, COMPONENT, • LIGHT WEIGHT (LESS THAN 1 OZ.) This is one spectacular maneuver! AND PRODUCT INFORMA TION. • RADIO SYSTEM PLUG INCLUDED Pennsylvania residents add 6% state sales tax. Float plans are available from Sid YES. WE HA VE GIEZENDANNER WIPERS Morgan Plans, 13157 Ormond Dr., Belle­ Prices subject to change. ville, M l 48111, or Taylorcraft, Ltd., 216 Willow Ave., Roseville, CA 95678, for the process of holding nominations for (8-3) probably just threw up their hands $5.50 per set, postpaid. These are scale its first slate of elected officers. We’d like and said "O K,” as we did. floats for nine-foot Cubs and Champs, to hear from YOU for nomination rec­ Even though it's the oldest R/C event or any similar size plane up to about 27 ommendations. Give me a call,even/ngs in existence. Pattern still manages to lbs. total weight. The Balsa USA Float Kit only, at (916) 786-2725 for this or any invite its share of proposed changes in is a slightly slimmed-down float, good other questions. Also, I’d like to run each rules period. This time, it received for planes up to about 20 lbs. T&D Fiber­ some of YOUR pictures, comments, etc., no less than 46 proposals out of the total glass, 30925 Block, Carden City, Ml and those can be sent to me at 216 of 59! 48135, has a set of fiberglass floats with Willow Ave., Roseville, CA 95678. I can Most of the pattern proposals came extensive molded-in detailing. These use any kind of picture except color from one individual, and though his are a little heavy, but would be OK on a prints, and slides/negatives w ill be background in the event is somewhat lighter, powerful plane like Ken’s. They returned. For a written reply, please limited in time, he has proven that a are the same size as the Morgan floats. include the ol’ S.A.S.E. fresh look at old and "established” rules If you readers show enough interest, IOIN THE I.M.A.A.!______· can often times bring up previously possibly a separate float-flying article hidden areas of dead weight and con­ could be written later, going into good R/C World .. . Continued from pege 13 fusion. In some instances, however, detail of the techniques. With all the immediately turns a former fun event years of experience have long ago flying site problems these days, seaplane enjoyed by the grass roots, "Sunday” proved that some "new" ideas were not flying offers some tremendous advan­ fliers, into a dead serious, win-at-all- tages and some real refreshing changes costs, experts-only dog fight. Once of pace. Try it, you’ll like it! nationalized, the fun-racers will have to ★ ★ ★ go in search of another new category. Fellas, this report is already over the R/C Soaring has been allowed to sit on allotted length, so I have to end this its own laurels for another two-year quick. The emergency battery backup period, with only one "loose-ends” system I mentioned in my January proposal. This one, which passed the column is about finished, about two initial vote by 9-2, would allow the more weeks’ worth of work at this Standard Class glider to use either writing. And, in the next column I will aileron or rudder for directional control, stop dreaming about past glories and but not both, coupled or otherwise. give an update on the current crop of It was unanimously agreed by the landing gear designs. There is some board that Sport Aerobatics needed a pretty impressive designing being done. clear definition of an attempt, and of an I will also talk about some slightly official flight. Not so simple to vote on unusual tools that are completely indis­ were two more proposals for Sport pensable once you use them. Aerobatics. Both were so involved and One last thing. The International contained so many proposals within Miniature Aircraft Association is now in proposals, that most board members MARCH 1981 91 ver. The last point includes the rotation to upright and a moment (same length as DON’T BE FUELISH! the others) of straight flight. . . followed CHECK OUR PRICES! by the straight and level exit! Keep in mind . . . that last portion of straight WE CARRY ONE OF THE FINEST FUELS flight is two things. . . it’s the last point of AVAILABLE, FEATURING - the maneuver and the straight and level finish, as in every maneuver. Remem­ • New high film strength lubricant for ber, the straight and level entry is not a increased power and engine life. part of the actual maneuver, nor is the • Highest quality ingredients straight and level exit. Therefore, the • Detergent action to cut varnish. center of point rolls is not in the middle COMPLETE LINE OF: of the inverted flight, but at the end of • B O A TS C A T A L O G - $ 2 .0 0 the inverted flight, just as the wings •H A R D W A R E (refundable with first order) • E N G IN E S break into the next rolling segment. • ACCESSORIES^ Think about it! I. Box 1868 Another significant proposal elimi­ T h · P ip s lin e X) Fremont,: re CA 94538 N O TE : Above prices are nates flight time limits, agreed to by a · P t a , «Μ Μ . « · « ( R/C k e e l ^ J I ( 4 1 5 I (415) 656-7072 per gallon, plus shipping. bare margin of 6 to 5. This really makes sense, as once the timed engine start is 9 H L GLIDERS Rolls, the Slow Roll, and 3 Horizontal accomplished, and with a maneuver 3 SATELLITE KITS Rolls. Although we agreed that the required on each pass, controlled flight KITS 7 OLD TIME GAS definition was needed, we strongly dis­ time is practically automatic. Would save Send 2 for 5 RUBBER. 3 NORDIC 1980 catalog 9 COMPETITION GAS agreed with the description given, which a lot of extra work at the flight line. FUEL and DT TIMERS 510 25 each more or less put the model in the same Two proposals from long-time pattern Model Supply position for each maneuver. Okay for flier Bob Noll, make sense. One is to t * FPO A80* '»9V rOPPANCl 0 90510 the continuous rolls but not for the eliminate the automatic progression point rolls. In the point rolls, the model from Expert to Master, making it volun­ so practical when put to actual use. partially rolls and stops in an attitude, tary to join the Masters level. Most R/C One proposal with which we heartily then partially rolls again and stops, etc., fliers will never reach the skill level agree (and so did the board, 8-3) calls for the required number of times. Graphi­ required to really compete in the Mas­ equal exposure between judges and cally, it appears as shown in the sketch. ters class. The proposer feels they should contestants. Adoption of this measure Each portion of the complete 4 or 8- be allowed to stay in Expert and remain would all but eliminate the miscon­ Point Roll consists of rotation plus a competitive, without having to devote ceived joys of contestant judging. moment of straight, horizontal flight. At the time and travel required to be

EXIT

FINISH

Another proposal needed splitting the end of the inverted moment of competitive in Masters, into two parts, one which attempts to flight, the model has completed 2 (or 4) |n his other proposal, Bob suggests describe the center of the 4 and 8-Point of the segments of the complete maneu-· deleting Pre-Novice, but at the same time, requiring that the Novice event be flown with fixed (or unretracted) land­ SAIL CONTROL WINCHES ing gear, and no tuned pipe. This one barely made it, but we hope it gets more support. A proposal that earned only three supporting votes, and of course lost, was to eliminate the entire Section 38 deal- Continued on page 102

Plug Sparks . . Continued from page 43 a Genie .29!! W-1 . . . $59.00 W-2 . . . $129.00 With 38 entries, results looked some­ thing like this: • Custom R/C design for all boat sizes «Power - 40 in. lbs. «Travel TEXACO time - 5 seconds «Voltage - 4.8-6 (W-1) «Size -2x2x5 inches. 1) Jay Humelbaugh The Probar W -1 is mechanically operated by a separate, neutralizing (Trenton Terror/Genie) 29:33 servo. The Probar Propo W-2 is designed to plug directly into the receiver, 2) Terry O ’Meara and requires no extra batteries. Specify Kraft, Futaba, or no connector. (Scram/Cannon .35) 26:02 3) Art Watkins Both winches are fully assembled and tested, ready to install. A ll mounting (Buccaneer/Madewell) 23:53 hardware, switch pushrod fW -1 only), and winch arm blank are supplied. PYLON ABC STAINLESS STEEL HARDWARE: MISCELLANEOUS ITEMS: 1) Bruce Chandler (Aero Champ/ Turnbuckles, Chainplates, Goosenecks. Sheet exit guides, Bowsie, Black Knight .10) 12:45 Boom vang pivots. Pad eyes, Tangs, Rudder posts. Mast head 2) Terry O’Meara Deck cleats. Boom cleats. Rigging wire, fitting. Dacron sheet line. (Alert/Torpedo .29) 10:29 ØNfr mqutrm invt&d 3) Wes Weathers PROBAR DESIGN P.O. BOX 639 ESCONDIDO. CA. 92025 (Playboy/Black Knight .15) 6:42

92 R/C MODEL BUILDER CABIN ABC 1) Larry Clark (Miss Delaware/O&R .60) 8:43 2) Andy Faykun Tubing Tools (Dodger/O&R .23) 7:16 Cutter handles round 3) Bruce Chandler (?/Cox) 5:07 brass, copper or alumi­ COMMERCIAL RUBBER num tubing in sizes up 1) Wade Wiley (Gordon Light) 7:30 to 5/8 O.D. A specially 2) Andy Faykun (Orr Chief) 7:17 designed nylon body re­ 3) Ken Sýkora (Sparky) (!) :03 duces grip friction to O.T. RUBBER make cutting easier. 1) L. Dewitt (Jeffries) 14:47 Cuts without crimping, 2) Wade Wiley (Casano) 9:07 too·. Tubing benders 3) M. Mikkelson (Naudzries) 8:20 handles tubes up to The Commercial Rubber results show 3/16 O.D. V-block clamp holds securely for cut­ that Ken Sýkora has found how to make ting, drilling, filing, etc. a Sparky climb vertically at 120 mph. Send 25 cents for our Trick is to make sure it does not contact price list and tubing, the ground. Haw-w! shapes, wire and tool SAM 7 catalog. K & S Engineer­ The Yankee Newsletter reports that ing, 6917 W. 59th St., three SAM 7 contests in a row have Chicago, Illinois 60638. suffered from winds of 30 mph or better. Telephone: 312/586- Is that ever rough on the free flight 8503. models! As a matter of fact, as Tom Lucas sez, if you thought June was breezy, then July 16 it just plain BLEW! With 11 entrants, no official flights were posted in the Cabin Gas or Pylon Gas events. The December 7980 RCMB issue. I have kindly sent by Tom Cope, 23262 S.E. 57th glider and rubber events were fairly been flying a KGS for some time; in fact, St., Issaquah, WA 98027. well entered, but on the average only this particular KGS was built in 7966/ It is One gem of information worth pass­ two per event finished out their flights. presently being recovered, as the finish ing on comes from SAM 8 member Bob Our hero, George Armstead, proved to is deteriorating. The KGS has been one Petro, of Coeur d’Alene, Idaho, who be the real die-hard modeler as he of the most consistent flying machines. It makes the following remarks: busted up his entire stable of models maintains its trim and flies the same Just finished reading the July SAM 8 built during the winter! Ouch! pattern wherever flown. At the moment newsletter and was pleased to see the The East Coast Champs was another it is powered with an O.S. .20 glow as I do Snuffy VI plans. Clarence Haught built contest plagued with heavy winds. not have an ignition motor to fit it, plus one a couple of years ago and powered Those who flew on Sunday enjoyed a SAM 7 does allow glow with properly it with a .75 glow engine. It was a good perfect day. Is there a moral here handicapped motor run. flier but was inconsistent under power, somewhere? Jack Whittles goes on to say The only change I have made in the which was the inherent problem of this the Twin Pusher event was the best of all construction was to incorporate the design. from a spectator standpoint. Danny bottom portion of the rudder below the I remember when the design first Sheelds, with his stentorian voice, could stabilizer into the sub-rudder. This appeared. Seems like everyone in De­ be clearly understood a half-mile away allowed for a flat stab mount and pro­ troit built one and all had the same with his instructions of, “ Gentlemen, vided a hard point for the bottom D-T squirrelly climb because the small cross- wind your motors,” and finally, “ One- peg and snuffer lube. As you say, the section would allow the fuselage to Two-Three-Launch!” Mike Poorman planked fuselage takes a little longer, twist. Some fellows tried internal brac­ outlasted five other twin pushers to win. but mine still looks good after 74 years of ing (Toft used planking) and some used Rather than publish the results of the flying. I recommend the KGS as a good double covering with Japanese tissue. East Coast Champs, we would like to competition ship. The real cure was discovered by an feature some comments by Ed Heyn, 30 SAM 8 unknown genius who cut silk on a bias Marion Ave., Norwood, MA 02062, to As reported, we are so far behind on for each quarter of the cross-section, wit: Chapter reports that this columnist is getting an opposing grain effect. That Have been meaning to write for some culling the best info (in his opinion) did it! After that, the model couldn't be time now, but there always seems to be a from a flock of SAM 8 newsletters so beat in its class. ship to finish for the next contest. I have been reading your column in R/C (ugh) Model Builder for quite some time and COCKPIT except for the emphasis on R/C, I think it’s great. As a 700% free flighter, it does seem as though we get the short end of INSTRUMENTS the publicity stick. 1/4 SCALE FOR POWERED This columnist would like to interject AIRCRAFT & SAILPLANES right here that as he has repeatedly • Full Color Dial Faces noted, his column is no better than his sources. With the majority of the mate­ • Detailed Bezels with Clear Lens rial submitted being R/C oriented, it is • Easy to Assemble and Install no real surprise to find the column this way. There is simply no way to print Avertable at your tavonte dealer news of free flight activities if you don’t MIDWEST MODEL have it! Photo No. 11 shows Major (ret.) Ed M í SUPPLY CO. Heyn with his KGS. He goes on to say: BOX 518R ROMEOVILLE. ILL. 60441 What prompted me to write was the 312-759-1955 presentation of the KCS plans in the MARCH 1981 93 At this time, this columnist has to call a read Swedish, the publication is full of halt to SAM Chapter reports as he is illustrations, drawings, and cartoons that rapidly running out of space. However, leave very little to the imagination. Well be of good cheer, we will continue with worth getting! Ρ I W 5emi-KÍ(s MU Machine Cul P art·) the news next month, as good news is Sven-Olov also sends Photo No. 14, 1941 Playboy S r . . 80” Span (P lan E x tra ) $14.00 1941 Playboy Jr.. 54" Span (Plan Extra) $10.50 never stale. We hope to feature more showing Sten Persson with a 1938 Swed­ 1935 Mina A m erica. 84" Span (N a n E x tra ) $20.00 reports from SAM 8,13,18, 21, 27, 30,32, ish rubber model called “ Prim." The 1939 Mercury (Sclentiflc'a). 72" (Plan Extra) $17.50 1940 Ranger. 46" Span (Plan Included) $13.00 39,40,41, and 49. Whew! Are you getting original Prim was designed by the two (Plans: Playboy Sr.. $3.00; Playboy Jr.. $2.50; Stark brothers, of whom Sune Stark was Mian A m erica. $4.00; M ercu ry . $ 4 .0 0 .) the idea? Midway Model Co.--Full and P artial Kite Before moving on to the next subject, the first World Wakefield Champion in R ib. T ip . A Former Kite--Machine Cut Parta 1952. Sten, himself, is a well-known 1937 Long Cabin. 78" Span (Plan Included) $20.00 we would like to feature a couple of 1936 F lying Q u ak er. 84" S pan (P lan I n c l.) $21.50 photos from the Midwest. Photo No. 12 engine collector with worldwide con­ 1937 Quaker Flash. 67" Span (Plan Incl.) $17.50 Old Timer R/C--Full Kite--. 10-. 15 engines shows Harry Murphy, Editor of the tacts. He is also a very active flier, 1938 P ow erhouse. 50" S p an . 2 o r 3 ch R /C $35.96 Central Indiana Aeromodellers (CIA) competing in most of the Swedish O.T. 1939 Air Trails Sportster. 50" Span. 2-3 Ch. $35.96 REPLICA OLD TIMERS (.020 engines) newsletter, Informer, receiving a birth­ Contests. 1940 Sailplane (G o ld b e rg 's ). 36" Span $14.95 SOUTH AFRICA 1940 Clipper MK II. (Goldberg's). 36" Span $14.95 day cake from Bill Hale of the “ Flying 1940 Playboy Sr.. (Cleveland's). 38" Span $12.95 Frisbee Corps,” more properly known as Received the latest issue of Wings 1940 Bustard Bombshell (Konofes'). 32" Span $11.95 Over Africa, which is an old line aviation 4K'a Models--Full Kile--Cos and R u bb er the Central Ohio Free Flight Club 1940 Buszard Bombshell. 72" Span $49.95 (COFFC). magazine of 39 years vintage. The Octo­ 1937 Denny Plane (Denny Jr.). 73" Span $79.95 “ Dirty Harry” has done more than his ber issue carries a beautiful writeup on 1939 Korda Wakefield. 44" Cabin Rubber $14.95 Tyro Modela--FuII Kit--. 20 to .40 R/C share in writings to help publicize and Old Timer activity, entitled “ The An­ 1941 Playboy Sr.. 80" Span $44.95 restore Old Timer flying to a place of cients are Active." J i R M odelt-020 Replica -Full Kits 1940 So Long. 32" Span. .020 Tee Dee $12.95 prominence in the various Midwest The article is basically the same as was 1942 Brooklyn Dodger. 32" Span. .020 TD $12.95 BOOKS ON OLD TIMERS contests. With Wright-Patterson AFB featured some time back in this column, Aiu7qu

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v* RAVAN MODEL PRODUCTS F/F EINDECKER $ 10.50 35" SPAN 45" LONG 2-CH. ALL BALSA B-70 ALL BALSA R/C $ 9 .5 0 SPORT F/F .020-.049 F/F ALL BALSA 2-CH. R/C $ 5 3 = 5 0 S 86" SPAN $15.50 ALL HARDWARE TAUBE ADD $2.50 SHIPPING * j » LALlr.CALIF. ntoiL/tn/1 RESIDENTS o Auu ADD bTb 6% SALEH SALES TAX TAX » A V A N MODEL PRODUCTS P.O. BOX 59513 NORWALK, CA 90650 cat. Max Starick, who writes for Air­ of stuff I like to publish, as some of the borne magazine in a column, “ For Old modelers stand in absolute awe of the Time Sakes,” indicates that get-to­ real famous designers/fliers, when in VINTAGE E-C PLANS gethers, informat meets, and the real reality, they are just like any other National events are taking on bigger modeler enjoying this hobby. They are attendance every year. always glad to hear and/or talk to you. As we mentioned before, Mervin No fooling! · Buckmaster, Editor and Publisher of Airborne, is an Old Timer enthusiast D orm oy...... Continued from page 22 himself. He freely admits he gets the best REARWIN SKYRANGER response from the readers on the O.T. The front cockpit cowl is a removable I/4 SCALE MODEL I75 column in his magazine. Do we love structure, made up with formers and that! 1/32 ply. Form this in place over the 9 FT. WING SPAN Biggest problem Merv has been hav­ front of the fuselage, tack gluing the 4 LARGE PLAN S H TS .- PLANS $ 20.00 QUADRA OR GL0 ENGINES a0p φ 2.00 POSTAGE ing is getting someone to draw plans for formers in place until the ply skin is him that are suitable for publication and formed and trimmed to shape. This CATALOG-OVER 50 PLANS 50 Φ DEALERS WRITE full-size reproduction for plan distribu­ piece is to be held in place at the front SID MORGAN tion. This columnist promised to help with two short 1/2-inch dowels which I3I57 Ormond .Belleville,Mich.48III us a out and then promptly got himself also align the engine section to the swamped with other duties. However, firewall. At the rear, use a couple of slant. There are 1/4-inch ply plates we still have hopes Buckmaster will small "L” shaped metal pieces attached between the spars at each of these eventually start to feature Old Timer to the underside of the dash and fas­ locations. With the main lower boom plans. tened with a couple of No. 2 x 3/8 sheet level with the building surface, hold the THE WRAP-UP metal screws into the side dowels. wing temporarily with small clamps at We used some of Bill Baker’s com­ Now build the wing. Make it either in each attach point. Center the wing by ments before, so pardon us if we get one piece, or in two sections and join at measuring the wing-tip-to-fin-post repetitious. We simply can’t resist some the center. There is no dihedral, so you distances, and at the same time, set in a of Baker’s observations about SAM and need a good eight-foot flat surface to 3° positive incidence in the wing, mea­ the SAM Championships, to wit: build or join on. When completed, the sured at the bottom of the wing. This The photos of foe Konefes and joe wing must be mated to the fuselage gives an effective net incidence of Konefes' brother, Ed, in your recent booms. Take plenty of time here. Make around 5°, relative to the stab and thrust column on the SAM Champs in R/C up the attach fittings, which goon either line. When you are sure all is right, drill Model Builder reminded me of some­ side of the main wing spars at two through the mounting brackets and the thing I overheard that struck me as locations on each side. The inner two are ply mounting plates with a 9/64-inch funny. Thought I would share it with done first. Bolt the fittings to the top of drill. Then, using 4-40 bolts, secure the you. the fuselage booms. Put the wing on so mounting brackets permanently to the loe Konefes went up to the timing- that the fittings are on either side of the wing. registration desk where Bob Larsh. front and rear wing spars,on an outward Leave the wing in place, and make up Contest Manager, was located. Upon seeing loe, Bob exclaimed. "I know who you are. You're Ed Konefes' brother!” two more classics •SEE YOUR LOCAL HOBBY DEALER· This struck me as funny as people from Flyline send 2 (ot catalog were falling all over themselves most of the day meeting Joe Konefes of Buzzard Bombshell fame. All day long, Ed was IT'S HERE!! Joe’s brother. Turn-about! Anyway, the best part of the fun at the SAM Champs $24.95 single channel r/c was being able to meet the celebrities M5.95 connected with the SAM movement like or Wally Simmers, the Konefes brothers. free I light QUAKER Chet Lanzo, plus others I can't remem­ \ FLASH ber. I got Chet Lanzo to autograph the propeller on my Lanzo Stick. That was a FLYLINE MODELS, INC. mistake because now I am afraid to risk *820 OOHR AVENUE (β -Ιί) Farman Moustique FAIRFAX VIRGINIA 2203: flying it. and that prop is a good one! 17031523-2038 Now how about that? This is the kind MARCH 1981 95 and sprayed it on. A couple of final coats of sprayed-on, slightly flatted clear dope will make the finish more resistant to smears from fuel and cleaning. Numbers mammoth Kits designed for and letters are flat black. Quadra and other 2 cycle engines. After finishing, assemble the partsand Plywood & Softwood construction you are ready for the rigging. This MAMMOTH consists of a number of 1/32-inch stranded steel cables or solid wire, all STINSON VOYAGER indicated on the plans. Several brass ONE QUARTER SCALE f itti ngs wi II have to be procu red or made Wing Span 101.75” - 2 pcs. up for the various attachment points. The lift strut wires run parallel to the lift strut, from the fittings at the fuselage to the outboard ends of the struts. These are the only removable pieces of the wire rigging. These wires are attached BARKLEY » permanently to the fuselage fittings, but TRAINER MAMMOTH SCALE at the outboard ends, a small loop of Wing Span - 56' $37.50 Engine Size · 19 · 35 LOADMASTER about 1/4-inch diameter is made and All Balsa Ply & Hardwood Construction Capable of carrying fitted over the end of No. 2 sheet metal Detailed Plans and Instruction Booklet 10 lbs. of cargo. screws projecting about 1/8 inch out of We pay shipping in U.S. and Canada. the fore and aft ends of the upper spar Dealer Inquiries Welcome. Ontario Residents add 7% P.S.T. attachment piece. Rig these just snug. Removal is accomplished by taking out J - S ENTERPRISES the fuselage-to-strut bolt and dropping P.O. Box 82 Belmont, Ontario NOL 1B0 it out of the bottom of the fitting. This Phone 1-519-644-0375 relaxes the tension on the lift wires, enabling you to lift the loop over the the lift struts from streamlined alumi­ are folded back into the wing center for head of the screw. Remember, on num tubing, dowel, brass, and steel, as storage and transportation. reassembly, to loop theseoverthe screw per plan. Bolt the lower end of each strut After completion of these and all heads first, then put the strut and wires to the fuselage fitting on each side, then remaining obvious small items, you are under slight tension while fitting the repeat the previously used technique to ready to cover and finish. SuperCoverite attach bolt. fix the outboard end of the strut to the was my choice. This is used on ail open The front cowling is sheet aluminum, wing. Watch to see that you do not have structures, as well as wrapped around the kind found in most hardware stores. any difference in wing incidence from the fairings on the fuselage struts and It is rather inexpensive and one sheet center to tip, as well as being certain that the landing gear. Give everything to be will make parts for several planes. Make the entire wing is level. covered a good coat of Balsarite. If you up cardboard templates or patterns for Make up the jury struts. These must used the aluminum tubing around the these pieces and fit before cutting out also be watched for effect on wing tail surfaces, buff the aluminum with No. the finished part from the sheet alumi­ alignment. They attach at the wing with 240 sandpaper before coating with the num. These pieces are held in place with removable clevis ends. With this ar­ Balsarite. Lap inside of the tubing with a number of No. 2x1/2-inch sheet metal rangement, the lift struts will ultimately the first surface covered, then a good screws. stay attached to the wing at their out­ overlap with the second. This has proven The dummy engine is made up and board mounting,thus removal orinstall- to give very good bonding at these fitted at this time. This is a removable ing the wing involves four jury strut points. com ponent and serves as an access clamps, two strut-to-fuselage bolts, and Cover the aileron gap with fabric, at hatch to the engine and the fuel system. four wing-to-fuselage bolts. The struts least on the upper surface. I did not do The control cables run under the seat, this initially, and aileron response was directly from the servo arms, through j WE’VE EXPANDED! } sluggish. After covering the gap, aileron pieces of nylon tube (which serve as SCALE DRAWINGS ^PHOTOS - BOOKLETS response was substantially improved, guide pieces), then on to the various becoming quicker and more positive. control horns. I suggest using extended Prime the fairings and any uncovered length arms at the servos in order to parts such as the front cockpit cowling assure sufficient throw at the control IN TERNATIO NAL with automotive primer, sanding be­ surfaces. The aileron connector wire tween coats till smooth. For the final runs through a simulated fuel line of finish, I used Aerogloss silver with a rubber tubing, up into the aileron servo FLYING SCALE MODELS small amount of flatting agent added, housed in the fuel tank. The fuel tank is removable, giving access to the servo for CUSTOM TUNED ENGINES connection and service. COMPETITION AC CESSO RIES Get yourself a 1/3-scale pilot to fill that cockpit, as the plane looks very lone­ Cox, OS Max, Rossi Λ Super Tigre Engines some in the air without one. Specialists In custom T.D. 049/05 1 and The total weight, balanced, with pilot, reed engines. Throttled T.D.'s available. should come out in the 12-13 lb. range, Complete Inventory of stock Λ custom parts. giving a wing loading of around 20 oz., a SPARROW HAWK F9C-2 (3 #>eet$)...... $11.50 Hard-to-get Items such as custom needle very respectable figure for a plane this 13/4" scale C/L, 44-1/2 " span valves, racing wheels, quick fills, size. A balance point favoring the 25% GRUMMAN J2F-6 "D U C K " (4 sheets)...... $19.50 fuel shut-offs, Λ many others. 1-1/2" scate R/C. 58" span Everything for R/C Λ control line racing. mark seems to be the best, even though VOUGHT OS2U-1 & 3 KING FISHER...... $19.50 the full-scale flies at 29-33%of the chord. (4 sheets) 1-3/4" scale, 83" span 1980-8 1 AM A rules special: Flying the Bathtub is a bit different GRUMMAN "GUARDIAN" AF-2S ...... $17.50 Goodyear .014 X 60’ solid lines 42.95 ppd. (3 sheets) 11/4 " scale. 75" span than I had expected. I have been flying a 1/4-scale Aeronca C-3 with about the Add S1.50 handling & postage For detailed brochure, send 25 cents to: Brochure 50d same overall specs as this model and had SMITH PLANS Kustom Kraftsmanshlp Box 2699 Laguna Hills looked for very similar flying charac­ 9422 N Fairway Blvd., Sun Lakes. AZ 85224 Calif. 92653 Ph: (714) 830-5162 teristics. 96 R/C MODEL BUILDER The plane tracks nicely without much rudder correction. The tail comes up fairly fast (it doesn't have far to move), then it will run all day on the mains until you give a touch of up. It does take a FIT ELI ETRIC good 100-150 feet of run to get flying speed when winds are light. All those wires and struts have a considerable VL-101 Electric propulsion system drag penalty. shown—using Hytork 48 motor and Once airborne, its behavior is unlike planetary gear box, SJ-3 switch & anything I have flown. It is slow, and charging jack, and B-33L fast charge sensitive to all controls except rudder (?). ni-cad flight battery—total weight To execute a good turn requires coordi­ 2«/2 oz.—will power models 25 to nated rudder, elevator, and ailerons. 50” wingspan weighing up to 10 oz. Initial attempts to turn only with rudder Send 50c for latest catalog showing produced only a slow deviation from full line equipment & accessories. V L PRODUCTS Division of Vista Labs course; when full rudder is applied, the Hobby dealers send for information. plane may do a fast spin. It appears that 7871 Alabama Avo., No. 16 the lack of fuselage side area contributes Canoga Park, California 91304 to the somewhat unusual flight charac­ teristics. Because it is draggy, landings And finally, the advantages to the SOAR Nats in status. This requires more are best made with some power on until contestant himself: stability than the AMA Nationals pro­ very close to the ground, then flare and • He can expect, for his money, a vides; before I pop for a round-trip chop the throttle. Rollout is surprisingly more professionally-run contest. plane fare to Ogallala or God-knows- short. • He can legitimately complain about where, I want to know what the contest In any event, in the air the plane is a shortcomings. is going to be worth it. No eighty-mile sight to behold. Just fly it around and • He can kick back and enjoy the round-trips to the pilot’s meeting, no enjoy it. The full-scale, after all, is not too contest without the sense of guilt that helping set up the winches every morn­ swift, and is not considered to be aero­ accompanies any under-manned con­ ing so we can get the flying off to a late batic in any sense. test ("I guess I should go out there and start. No pleading for timers over the If you build the plane, feel free to volunteer to sit on a winch, but...” ). loudspeaker. To hell with that kind of write with any questions regarding the ★ ★ ★ stu ff. . . that’s amateur. model. Let me know how yours came The longterm effects of a PRO-AM So the next question is: who's going to out and how it looks. Let's communi­ division in our contest system should be be the first group to sponsor a PRO cate, you guys out there, it’s how we twofold. First, it should promote, in contest, a contest with a $40 entry fee, scalers progress in the art. Ideas, both every section of the country, relatively paid officials, first-class accommoda­ positive and negative, are what we thrive stable manpower pools: small groups of tions all around? It won’t be an over­ on. people with a reputation for being night success: the first time around you I would like to thank Mike Kimbrel for reliable, professional contest workers, may draw only locals. But if you do it his wonderful cooperation on this pro­ people who don’t particularly care to right . . . and word-of-mouth is still the ject, supplying me with an abundance of compete in the big events, but take best advertising in a sport as small as information with which to design and pride in their ability to run them w ell... ours .. . your reputation will grow. The build this replica of a replica. and who are paid for their skills. hotshots will come out of hiding, know­ My thanks also to my many friends of The second effect of a PRO-AM ing that the high entry fees will keep the the South Shore RCC, for their help and program should be the eventual rise to field from getting too crowded, and encouragement during early flight test­ prominence of another truly national you’ll soon have yourself another ing of the bird. soaring contest, comparable to the old gathering of eagles, another contest Thanks to Fulton Hungerford for his with a national reputation. marvelous wheels, without which the plane would not have come to pass. REFERENCES: New LEISURE D IG ITA L Auto Charger Historical: Air Progress, Spring and Fall 1959, Spring 1960, February 1968. Full-Scale Drawings: Mike Kimbrel, 1333 Garrard Creek Rd„ Oakville, WA 98568. Wheels: F.H. Wheels, 1770LilacCircle, Titusville, FL 32780. Steel Rigging Cable (1/32): Balsa USA, P.O. Box 164, Marinette, Wl 54143. ·

Radical...... Continued from page 28 The advantages to the helper are obvious. If he’s being paid, he can justify ^o himself and his family) the spending of two 8-12 hour days at the flying field. $99.95 The money he brings home is no king's New digital charger designed for the serious modeler who wants to obtain top perform­ ance from NiCd batteries. Features a large (1/2" high) LCD readout, which stands out ransom, but at least it’s a tangible "thank even in strong sunlight. Digital meter is designed to read both current and voltage to bet­ you" for his efforts. Let's face it: paid ter than 1% accuracy. Unit also contains a variable rate charger which allows selection of jobs simply carry more prestige than a constant current charge rate up to 4 amps. Permits charging any size NiCd from 250 ma volunteer jobs do. And if he’s a Junior, up to 1.2 AH. Built-in equalizer circuit tops off battery overnight for top performance at struggling to support an increasingly that big race. As w ith all LEISURE chargers, this digital unit is manufactured w ith orig­ expensive hobby/sport. . . well, just ask inal. quality electronic components, and is warranteed for 60 days from date of purchase. the next fourteen-year-old you meet See your local dealer, or order direct. how he’d like to earn $150 some week­ LEISURE ELECTRONICS, 11 Deerspring, Irvine, CA 92714 end. ______Phone (714) 552-4540______

MARCH 1981 97 only as the model headed into the wind at each turn. JOHN POND There was no ground elfect. since the model was way up. The wmdspeed dilferential at launch (lirst noted. I believe, by Frank Zaic in one ol the yearbooks) was long past and the Old Time Plan Service model was Hying in its very own "still ” air II must have landedat your leet on thataircratt-carner The largest selection of plans in the world at the most Yet why did it stall only into the wind? I write reasonable prices. Each list $1.00 as a primitive Iree-lhghter. but leel that those All 4 for $3.00 observations will be ol interest, even to pattern No. 11 OLD TIMER F/F GAS liters. P S II you want a good sub/ecl lor Old Timer No. 11 OLD TIMER RUBBER/TOWLINE ol the Month, try Hank Cole's "Smoothie." I’ve No. 11 OLD TIMER FLYING SCALE A through K been Hying one all season over here, and I can No. 11 OLD TIMER FLYING SCALE L through 2 tell you that it really is a winner, both in looks and performance I can let you have some •New prices effective June l. I980 words on it il you like P.O.Box 3215 Yours sincerely. San Jose. Calif. 95156 Peter Michel Orpington. Kent. England Phone (408) 292 3382 Here we go again with the downwind turn, You’ll be able to train your help in Any volunteers? only in disguise. Somewhere in here, we advance, and count on them to show up. Dave Thornburg, 236 Pennsylvania have to examine the difference between Everyone involved will know exactly Ave. N.E., Albuquerque, NM 87108. · wind, a moving air mass, and air movement what his or her duties are going to be; within an air mass. everyone will have proven his compe­ Letters...... Continued from page 7 Dear Bill. tence in one or two AM contests well The November Mystery Model surely this before the biggie. You'll know exactly Trails Sportster and Brooklyn Dodger this way is Leon Shulman's Banshee* 11 can agree that how much help you need (and how My 13-year-old son covered his Berkeley this design was popular in England at the endol much you can afford) the minute the last Brigadier the same way (We are both SAM the 40s performed well with an Ellin 1 8cc advance entry fee rolls in. Each winch- members in U K ) diesel, which was one ol the best motors in its master can be in charge of his winch; Douglas Tennant class ai lhal time based on the Arden 091 each tim er his own stopwatch and Macclesfield. Cheshire. England should think landing circle markers; the scoremaster The motor on the Bowden Wasp shown in his calculator and the scorecards . . . no Dear Bill. photo 10 ol Plug Sparks' this is a Frog 100. I was intrigued by the piece on turning in the reason why the CD should have to carry ol 1 cc and a diesel once again Frog, or wind (RCMB. October), and was more than International Model Aircraft, to give them their all the paraphenalia back and forth each three-quarters convinced by the analogy ol the proper name, was one ol the hrst to provide day. You’re all professionals doing a aircralt-carrier sailing down a 30-knot wind at motive power in England alter the war. starting professional job, now ... no more exactly 30 knots with us 175 (1 75cc) petrol, sorry, gas motor, wishy-washy volunteers. No more beg­ Yes. aircraft do circle in their own still an. which was quickly followed by the 100 The 100 ging and pleadingfor help, nomorekid- irrespective ol the wind In theory, lhal is1 was my hrst introduction to powered flight glove techniques with the personnel. At With the Northern Virginia B /C Club s carrier around 1946-47. bolted on the cutolt nose of a last you’ve got the power, the economic m mind. I was tnm-llymg a new Open (Un­ Wakeheld model, which incidentally was also a power, to do the job right, to show the limited) rubber /ob the other day at London’s Frog product One thing that still remains in my soaring fraternity how a contest ought now-disused Croydon Airport mind regarding the Frog 100 is that a smashed to be run. A really PRO contest . . . it’s On about two-thirds maximum turns, a slight motor would be repaired or even replaced lor something we’ve needed for years now, power-stall developed Nothing unusual about the grand sum o l seven shillings and six pence and you and your group can pull it off! that But the stalling tendency showed itsell about $1 in today's currency I have obviously given away both my age and background with the above comments Over the past 35 or more years. I have enjoyed all the various phases ot model aircralt which have O f CURACAO MODELBOUW come along While strictly Ft/C these days. Ihe ^ 0 presents: wide coverage given in your publication to all areas ot Ihe sporl is still ot great interest My the "HEGI" HOVERCRAFT compliments to the chefs' Yours truly. Length: 39" - Width: 20" -‘Heigth: IOV 2" - W eight: 7 lbs., 2 kilogram John Hipwell Calgary. Alberta. Canada

Dear RCMB. You will doubtless receive a minimum ot 43.756. all correct identifications that the November Mystery Model was a Shulman Banshee, but I’ll bet you will only receive one that includes a photocopy trom the original 1948 Aeromodeller Annual; this had the result ol completely changing the then purist'attitude in U K powered-model design S'tunny. that This model HOVERCRAFT is powered yi/ith two electro motors, each driving a now. with SAM. that 'purist' attitude has propellor. One for propulsion and the other for the aircushion. Steering by two eventually returned, along with a lot ot other Airrudders. On calm water able to reach a relatively high speed. Can be used on all kinds nostalgic things like trouser turn-ups and of not to rough surfaces. Easy to build, fully operational kit available for US$ 175,— stocking seams and silent black-and-white (Price includes airparcelpostage). films . or is the TV set on the blink again? The kit will be sent to you on receipt of your cheque or moneyorder. I look forward to my free subscription with conviction, as I have /ust observed two mag­ CURACAO MODELBOUW - P.O. Box 470 - Curacao - Neth. Antilles pies sitting on the same branch on a tree in the Mai! orders ■ Retail' - Wholesale ■ Import and Export ■ Design ■ Custom Built. garden, which is an Irish 'goodie'augury-wise, and in any case, the word Banshee is of pure

98 R/C MODEL BUILDER Ace Radio Control, Inc...... 71 INDEX TO ADVERTISERS Proctor Enterprises...... 81 American R/C Helicopters...... 85 Radio Control Buyer's Guide...... 76 Associated Electronics...... 75 Ravan Model Products...... 95 Astro Flight...... 78 Hobbypoxy, Pettit Paint...... 82-83 Repla-Tech International...... 96 Authorized Radio Control...... 90 J-5 Enterprises...... 96 RJL Industries...... 74 Barron’s Scale Classics...... 84 K & B Mfg. Co...... 1 Satellite C ity...... 88 Bavarian Precision Products...... 80 Kimbrough Products...... 78 S.C. Modeler...... 90 G. Bertella...... 102 Kraft Systems...... Cover 2 Sig Mfg. Co...... 5 Blue Ridge Models...... 72 K & S Engineering...... 93 Smith Plans...... 96 Byron Originals ...... 68-69 Kustom Kraftsmanship...... 96 Sterling Models ...... 81 Cannon Electronics...... 86 Laughing Whale, The...... 79 Sullivan Products...... 70 Cass Engineering...... 83 Leisure Electronics...... 97 Tatone ...... 84 C & D Enterprises...... 79 Midway Model Co...... 77 T & D Fiberglass...... 84 Circus Hobbies...... 87,Cover 3 Midwest Model Supply...... 93 Toledo R/C Exposition...... ·.... 104 Vern Clements ...... 72 Model Engineering of Norwalk...... 89 Tom Thumb Sky Tracings...... 90 Coverite...... 77 Model Rectifier Corp...... Cover 4 Uber Skiver Knives ...... 103 Craft-Air, Inc...... 4 Walt Mooney Peanuts...... 102 Verlag fur Technik und Jim Crocket Replicas...... 80 Sid Morgan Plans...... 95 Handwerk, GmbH...... 73,94 Curacao Modelbouw...... 98 Northrop Real Estate...... 75 VL Products...... 97 DuBro Products...... 67 Octura Models ...... 72 Williams Bros...... 86 Electronic Model Systems...... 80 Pacer Industries...... 73 FAI Model Supply ...... 92 PanaVise ...... 82 Flyline Models...... 95 Peck-Polymers ...... 91 HOUSEADS Fox Mfg. Co...... 87 Pipeline, The...... 92 Classifieds ...... 99 Giezendanner U.S.A...... 91 Playtron U.S.A...... 3 Oldies but G o o d ie s...... 66 Dick Hanson Models...... 77 John Pond O.T. Plans...... 98 P la n s...... 100,101 Hobby Horn...... 94 Probar Design...... 92 Subscription Form ...... 100

EMBROIDERED EMBLEMS AND PATCHES CLASSIFIED ADS made to your design direct from manufac­ turer. No quantity limits. Send sample or Non-commercial (personal items) Rate is 25 cents per word, with a minimum ol $3 00 sketch, tell us how many Prompt free custom Commercial Rate is 40 cents per word, with a minimum ol $5 00 No advertising agency quotation. D.H. & S, Box 711, West New York, discounts allowed NJ 07093. All ads are payable with order, and may be lor any consecutive insertion period specified Name and address free, phone number counts as two words Send aci and payment to MODEL BUILDER Magazine. Classified Ads. 621 West l9 lh S t .Costa Mesa. CA 92627 WANTED — OLD MODEL ignition engines, cars. etc. Paying top dollar. Bill Simpson, 7413 Via Lorado. Rancho Palos Verdes. CA 90274; PLANS: Great golden age flying models built FOR SALE: Large collection of ignition (213) 377-3532 up from world's largest (1300) authentic plans engines, glow engines, kits, plans, maga­ line. 6" to quarter size. Send SASE for free zines. tools and hardware. Send 75Φ in master list. Cleveland Models, 10307M1 stamps for list. Larry Vance. 5066 Cindy Way, FREE SAMPLE COPY . Used equipment Detroit, Cleveland. OH 44102. Las Vegas. NV 89102. bargains! Hundreds of planes, radios, boats, helicopters, engines, e tc . etc Buy or sell, get WANTED: Du-Bro Shark R/C Helicopter GLASS CLOTH: 2 oz., finest woven quality, one free ad with subscription: $10/year (10 using the O&R engine Carl F. DeFilippo, 905 38" wide. 5 yd. length $16.65 ppd. Dan issues). Write Hobby Swap. P.O. Box 834. Main St. Winchester, MA 01890; (1-617) Parsons, 11809 Fulmer Dr. N.E., Albuquer­ Santa Maria. CA 93456. 729-2877 que. NM 87111. PEANUT SCALE PLANS: Boeing P-26. Fairey HAND LAUNCH GLIDER KITS: Thermal Spearfish, Northrop P-61 E, $2.00 ea. ppd, or AIRCRAFT IN PROFILE: Vols. 1,2.3,4.5.6,7, Piglet. Merlin, $4.98 each. Tiny Piglet $3.49. send $1.00 for sample plan and complete list. 9, 14 Mint $150 Joe Locasto. 447 State St., $2 shipping per order. Campbell's Custom David Diels. Box 101. Woodville. OH 43469. San Mateo, CA 94401. Kits, P.O. Box 5996. Lake Worth, FL 33461.

Other diesel conversion heads avail­ Gaelic origin, though the delinition ("a woman Please note: ol the lairies ") may by now be open to misinter­ This renewal is to go in effect ONLY IF able include ones for the Cox .020 and pretation! service begins with the February 1981 issue. ■049/.051; O.S. Max .10, .25, .40, .60/.61, I actually have two copies ol the 1948 II this is not possible, please return my check. and .90; Super Tigre .21X, .35/G-21 .35, Annua! end would trade lor a copy ol ‘The With this price increase, Model Builder is and C .60 Bluehead ABC ring; Fox .15, Lightplane' by Underwood and Collings il the most expensive ol all ol the modeling .45 B.B., and .60 Eagle II; Webra .91; Enya anybody is interested: I also have a complete magazines. It is also my nomination lor the -19X; and K&B 3.5. Davis also sells diesel Aeromodeller lile since 1935 .. not tor sale, but magazine I can most easily do without. fuel in pints, quarts, and gallons, along I could possibly arrange the occasional photo­ R.A.L. with “ Super Flex’’ fuel line, a highly copy lor alicianados ol the early birds! Orange, California flexible and abrasion resistant neoprene Sincerely, All of which proves the old adage that fuel line for use with the larger-than- John Carroll "Genius is never appreciated in its own back 1/2A size diesel conversions. Blackrock, Co. Dublin, Ireland yard." · Best bet would be to send an S.A.S.E. and ask for the literature on all of Your answer, John, was number 43,755, D.D.D.’s products. Write to Davis Diesel and since number 43,756 thought the M/M Counter___ Continued from page 10 Development, P.O. Box 141, Milford, CT was Taibi’s "Hornet," that puts you dead last rpm. Fuel consumption is claimed to be 06460. among those who were correct! One of an ounce every two or three minutes, ★ ★ ★ those two magpies must have been an Dynamic Models is now producing a undernourished pigeon. depending on the prop and throttle If anyone is interested in John's trading setting. The actual conversion is a do-it- 5/8"=1’ scale one-piece fiberglass hulfof offer, send us your stamped, sealed en­ yourself operation, consisting simply of a typical steam trawler used during the velope, and we'll forward it to him. changing the head . . . a three-minute 1910-1940 era. Trawlers of this type were job at best. used for fishing and, in wartime, were

MARCH 1981 99 FULL SIZE PLANS SERVICE No. 1280-C.P. WEDELL-WILLIAMS $3.00 No. 7801 APPRENTICE $5.00 Including reprint of construction article Plans from golden era Wanner rubber kit. Continually popular genuine R/C trainer (if any) A ll ribs and bulkheads shown, 30" span. for .19·.35 eng.. 72" span. Bill Northrop. No. 7800.T. STRATOSPHERE $3.50 No. 11801 "MAMA MIA!" $9.50 Streamline cabin rubber ship from May Να 3811 DORMOY "BATHTUB" $15.00 Latest, super-size pattern ship by leading 1941 M A N.. 36" span By Henry Cole: Unusual 1/3-scale R/C (8' span) early ul­ flier/designer/kit manufacturer. Joe Bridi. tra-light homebuilt, .40-.60. Hank lltzsch. No. 6801 JUNKERS J-10 $6.00 No. 1180-O.T. FOKKER D-VIII $4.50 Squarish low wing WW-I R/C Sport Scale No. 3812 HANDLEY PAGE 0/400 $4.00 Very stable F/F flying scale ship for .23 model for .45- 60 power. By Dick Allen. F/F scale WW-I bomber, 66” span, for 2 ignition engines, 57" span. By Earl Stahl. 1/2A's. Major contest winner. B. Dennis. Να 1180-C.P. FAIREY "BATTLE" $300 No. 381-0.T. SUPER BUCCANEER $7.50 Fine proportioned 30" span rubber pow­ STICK 'EM PATTERNS Most famous Antique gassie from 1937. ered low-wing scale ship from Megow kit. Complete sets of pressure sensitive patterns Great for R/C, 90" span. Bill Effinger. provide "printed wood". . . on your stock . . No. 10801 UDET FLAMINGO $6.75 fo r selected M O D E L B U IL D E R plans. Press No. 381-C.P. WACO YQC-6 $3.00 Easily built R/C sport scale aerobatic bi­ all patterns for ribs, bulkheads, tips, etc., on Super-detailed plan from Skymasters kit. plane for .30-,40 power. Roland 8altes. proper thickness sheet balsa or plywood, A ll ribs and bulkheads accurately shown. and cut 'em out1 No tracing, no transferring, No. 10802 OHMSICK ANGEL $350 no plans tearing, no inaccuracies Just like No. 2811 LIBERTY SPORT $17.75 F/F Payload-like design for R/C and 020 making up your own kit with printed wood. Mammoth 3-1/4" scale biplane for belt- electric power. 43" span. Randy Wrisley. "Stick 'em Pattern" numbers correspond to drive 60 on up. Four sheets. Roger Stern. plan numbers. Order with plans and they'll No. 1080-0.T. THE S-4 $350 be mailed together . . 3rd Class. Add 504 No. 2812 DYKE DELTA $1.50 Super-small gassie from 1939 Μ.A.N., for per set to m a il patterns 1st Class. Super-light indoor Peanut Scale model. .049 or Elf Ο power. Malcolm Abzug. W ill fly 35-45 seconds. By Ken Johnson. CALIFORNIA RESIDENTS ADD 6% TAX. No. 1080-C.P. STINSON RELIANT $4.00 No. 11731SP BIG JOHN the FIRST $5.95 No. 281-O.T. HERON $3.00 A 3/4" scale model from 1934 Ideal kit. No. 574 O.T.SP T-D COUPE $2.95 A 48" span Class A gassie from Dec. '39 Excellent plans for F/F rubber. R/C. etc. No. 674-O.T.SP RED ZEPHYR $3.95 Flying Aces. Cabin style. Frank Gagne. No. 6741SP TRIXTER BEAM $2.95 No. 9801 POOLBOY $400 No. 774-O.T.SP OUT Ό SIGHT $2.45 No. 1811 WACO YKS-6 $6.75 Tmy (20" span) R/C biplane flying boat No. 7741SP CURTISS A/12 SHRIKE $3.95 Classic cabin biplane in R/C Sport Scale. for 010·.020 eng.. 2-ch. By Ken Willard. No. 874-O.T.SP POWERHOUSE $3.95 For .29 - .40 engines. By John Burns. No. 91074-0.T.SP BUHL PUP $4.95 No. 9800.T. DOLPHIN $1000 No. 181-O.T. '32 WAKE WINNER $2.00 No. 11743 SP "C-QUELL" S3.95 Beautiful planked-fuselage 9" streamliner S uper-light 3 7 " span rubber m odel uses No. 575 O.T. SP MERCURY S3.95 from 1939 M.A.N. By Thracy Petrides. motor stick. Designed by Gordon Light. No. 775-0.T. SP BOMBSHE LL S3.25 No. 277-O.T. SP BERLINER JOYCE SS.25 No. 1812 PAULHAN-TATIN $1.50 No. 8801 FUJAVAK $5.00 No. 4771 SP "MISS ARPIEM" S3.2S Interesting 1911 streamliner with curved Sharp looking T-tail R/C powered glider No. 577-O.T. SP GLADIATOR $4.75 dihedral, in Peanut Scale. By J-F Frugoli. for .049-15 eng., 80" span. Pavel Bosak.

No. 12801 OMAC-1 $7.50 No. 8802 SCHNEIDER CUB $6.50 Price includes 3rd Class postage and reprint R/C Sport Scale pusher-canard executive Famous R/C Aircraft No. 5, 3-timeNats of building instructions (if any). Add 65 i aircraft. 60 power. By Col. Bob Thacker. winner. 6' span. .60 eng. Alex Schneider. PER PLAN for 1st Class postage. Add $1.00 PER PLAN for overseas orders (except APO No. 12802 AUSTER J-5 $2.00 No. 8803 POTTIER P 70S $300 Fine flying, 18" span rubber scale light- F/F scale French homebuilt. 02 electric, and FPO). Complete plans list 354. plane. Double for Jumbo. Steve Gardner. trike gear, 29" span, neat1 By E. F ilion. CALIFORNIA RESIDENTS ADO 6% TAX R/C MODEL BUILDER PLANS SERVICE No. 1280-0.T. STRUCK'S KGS $4.00 No. 8800.T. HAYSEED $4.00 Box 335. 621 West 19th St. So-called because proportions are KG-ish, Hot A/B pylon (no-window cabin) never but the looks are Zipper-like. Class B/C. before published, 4-ft. span. Carl Hermes. COSTA MESA, CALIFORNIA 92627 SPECIAL R/C MODEL BUILDER SUBSCRIPTION OFFER . .

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OF OUR MOST POPULAR CLASSIC OLD TIMER FLANS

No. 575-O.T. MERCURY $5.00 SEE PAGE 100 FOR ORDERING INSTRUCTIONS. Designed by Ben Shereshaw. kitted by COMPLETE R/CMB PLANS LIST SENT WITH EACH ORDER. Scientific. 72" span. By Phil Bernhardt.

No. 1180-0.T. FOKKER D-VIM $4.50 No. 977 O.T. "GUFF" S4.00 No. 475 O.T. G.H.Q. SPORTSTER $5.00 Very stable F/F flying scale ship for .23 W alt G ood's 1938 Class 'C ' gas w inner, From July 1936 M A N., also kitted by ignition engines, 57" span. By Earl Stahl. from '40 AT Span 72". Al Patterson. G.H.Q. By Louis Loutrel. Phil Bernhardt.

No. 980-0.T. DOLPHIN $10.00 No. 877-0.T. PB 2 $7.00 No. 175-0.T. FLYING QUAKER $5.00 Beautiful planked-fuselage 9' streamliner Payload gas model winner from Aug. '38 F irst gas m odel k it by M egow , 1937. from 1939 M.A.N. By Thracy Petrides. M.A.N. Spans 8 feet. By Thracy Petrides. Span 7 ft. Redrawn by Phil Bernhardt.

No. 880-0.T. HAYSEED $4.00 No. 777 O.T. NEW YORKER IV $3.00 No. 1274-0.T. THERM’L THUMBER $4.00 Hot A/B pylon (no-window cabin) never Frank Zaic's 1938 Stout Trophy winner, H o t Class A o r B p y lo n ty p e gas m odel. before published, 4-ft. span. Carl Hermes. also for Wakefield. Patterson & Northrop. Span 48". Redrawn by Phil Bernhardt.

No. 780-0.T. STRATOSPHERE $350 No. 577-O.T. GLADIATOR $5.00 No. 1174-O.T. LANZO STICK $3.50 Streamline cabin rubber ship from May Class C free flight from March 1941 Air Rubber stick winner, '40 Nats. Span 4!4'. 1941 M.A.N., 36" span. By Henry Cole. Trails. 68" span. M. Schoenbrun design. Still good in Unlim. By Phil Bernhardt.

No. 380-O.T. FLAMINGO $6.00 No. 477-O.T. CLOUD CHASER $150 No. 91074-0.T. BUHL PUP $6.00 Rare old-timer appeared in 1938 JASCO This 30" span stick job from 1938 MAN Semi-scale 8 ft. span model published in catalog, 89" span. By Roger Hammer. is OT, FF trainer, Unlim. Bruno Marchi. 1936 MAN. Redrawn by Phil Bernhardt.

No. 280-O.T. RED RIPPER $5.00 No. 377-O.T. GAS CHAMP $5.00 No. 874-O.T. POWERHOUSE S5.00 Sort of a 'squared off' Zipper, from 7/40 The famous 1940 "Fastern States Champ" Taibi's famous design for Forster 99 ign Flying Aces. 72" span. By Jerry Peeples. by Russell Simmons, span 76". Al Patterson. Great for R/C O. T. By Phil Bernhardt.

No. 180-O.T. SUPER CLODHOPPER S3.00 No. 1276-O.T. RAMBLER $4.00 No. 674 O.T. RED ZEPHYR $5.00 Highly refined version of 1937 Moffet G ood 7 2 " span contest gas m odel tro m One o f the m ost fam ous o f early k it gas winner, from 1941 A.T. By Jim Cahill. 1939 Flying Aces. By Gilbert Shurman. models. Redrawn by Phil Bernhardt.

No. 1279-0.T. MISS TINY $4.00 No. 1076 OT CALIFORNIA CHAMP $3.00 No. 574 O.T. The T D COUPE $5.00 Well known and sharp little 1938 gassie 1940 Wakefield with retract wheel, twin Classic high wing 1936 ‘C cabin gas job rudders, anhedral stab. Tom Engleman Span 64" Redrawn by Phil Bernhardt for .19.23 ignition. 46". Barney Snyder.

1179 O.T. MISS PHILADELPHIA $8.00 No. 976-OT WINGED VICTORY $5.00 No. 474-0.T. PACEMAKER $5.00 Maxwell Bassett's famed 8-ft. parasol gas Classic and realistic gas model from 1937 J L. Sadler's famous Class C low wing model, kitted by Scientific. By MB staff. MAN. Radial cowl, 5' span. Joe Weathers. gas model Redrawn by Phil Bernhardt.

No. 979-O.T. LANZO '37 STICK $8.50 No. 876-0.T. RECORD HOUND $5.00 No. 274-OT PACER "C" $4.00 First R/C Nats winner, 4th in Famous Shoulder wing mono-wheeler with anhed­ Sal Taibi's famous 1941 Nats gas winner. R/C series. Spans 9 ft. By Chet Lanzo. ral stab. Span 72". Hank Struck design. 60" span. Redrawn by Phil Bernhardt.

No. 879-O.T.-2 CHALLENGER $4.00 No. 576-O.T. SCRAM $5.00 No. 174 0T EHLING'37 GAS JOB $5.00 E a sily-b u ilt Class B gassie w ith 5 0 " span Clean Class C cabin job from July 1938 Frank Ehling's 8 ft. span 1937 gas model. from May "41 Air Trails. H.A. Thomas. Flying Aces. Span 83". Heit/Patterson. Still winning' Drawn by Phil Bernhardt

No. 579-O.T. TAYLORCRAFT $12.00 No. 476 O.T. CABRULER $4.00 No. 1273 OT INTERCEPTER $2 00 Quarter-scale in 1941! Famous 9-foot de­ Never-before-published Class A cabin mo­ An .020 Replica of popular Goldberg de sign kitted by Miniature Aircraft Corp. del New Ruler, by designer Hank Struck sign, kitted by Comet. By Wayne Cain.

No. 379-O.T. PRIVATEER $6.00 No. 276 O.T. "LONG CABIN" $5.00 No. 1073 OT GOLDBERG ZIPPER $4.00 Very clean cabin design from Sept. '38 Good looking, stable cabin gas model of M ost fam ous o f all O T gas m odels, ended M.A.N., 87" span. By Thracy Petrides. the 1937 era Span 78" Phil Bernhardt cabin era. Redrawn by Phil Bernhardt.

No. 878 O.T. .020 RECORD HOUND S2.50 No. 176 O.T. KORDA WAKEFIELD $2.50 No. 973-OT SPOOK 48 $4.00 Classic Henry Struck design. Could dom­ The classic of all rubber powered comp­ Well-known gull wing design qualifies for inate .020 Replica class. Dave Sweeney. etition free flights By Phil Bernhardt, Antique Old Timers. By Snyder & Muir.

No. 778-O.T. CURTISS ROBIN $6.00 No. 1175 O.T. FOO 2 U 2 $3.00 No. 773 OT LANZO 8' GAS MODEL $6.00 A 1937 Sport Scale ship1 From Comet A pre-Zipper design by Dick Obaiski. re Chet Lanzo's famous "Record Breaker " kit. 72" span. Designed by Joe Konefes. duced to .020 Replica, by Ron Sharpton. Two large plan sheets By Phil Bernhardt

No. 678-O.T. MISS DELAWARE $5.00 No. 875 O.T. "38 MOFFETT CHAMP $3.00 No. 673 OT ALBATROSS $4.50 Steve Kowalik's 1937 Junior Motors Con­ Canadian Roy Nelder's beautiful rubber Class C gas ship designed by George sistency winner. Easy to build, 7' span. ship A real classic By Phil Bernhardt Reich Redrawn by Phil Berhardl

No. 1277 O.T. HURRICANE $2.50 No. 775-O.T. BOMBSHELL $4.00 No 573 OT 1 AERBO 020 $3.00 Earl Stahl's 33" span 1940 rubber pow­ Famous winner of Class C gas at the '40 Replica of 1941 Class A Nats winner ered low winger Northrop & Patterson. Nats, by Joe Konefes. Phil Bernhardt. Span 30" Redesigned by Phil Bernhardt

MARCH 1981 101 for the exhaust exit. It’s small, light, and mounts to the engine with plenty of From Italy, The New B&C-61 clearance between it and the firewall. Big pow er - low weight and frontal area. Fit for scale model fighter The compact size makes this muffler an excellent choice for all types of models, aircraft, especially Ducted Fan. especially small R/C helicopters. Available for immediate delivery. Retail price is $12.95, at your dealer or direct. If ordering direct, add $1 for shipping. Bill Evans R/C Aircraft, 20825-Vi Specifications: Roscoe Blvd., Canoga Park, CA 91306.· Total displacement - 9.92cc (.61cu. in.) R/C World . . . Continued from page 92 Stroke - 17.50mm Bore - 19.00mm ing with AMA Pattern, and to use in­ Weight - 510g (18 oz.) stead, the FAI Pattern rules. A novice HP-2.10 at 24,000 rpm flier in this particular proposal, was supposed to pick his own maneuvers that would total a maximum K-factor total of 250. Wow . . . some novice! The twin inline B&C-61 is a shaft-induction, Schnuerle-scavenged, lapped piston motor Every time the rules proposals go with a four ball-bearing crankshaft. It uses a one-piece sand-cast crankcase and the con­ through their cycle of three voting steps, necting rods are machined from high-duty alloy w ith bronze bushed big-ends. Engine is with publication before and between, an alternate firing type with a single R/C Perry carburettor, so it has low level of vibra­ tion and easy starting.The MINI-VOX Super Silent muffler, designed for this engine, and the contest board members hope to all other parts are available. Anyone interested in acquiring or other information, may hear from their constituents, the mem­ write directly to the manufacturer. Shipping to all parts of the world. Dealer inquiries bers in their district, expressing their likes, dislikes, and opinions about the proposals. . . and every time, they hear G. BERTELLA from them AFTER the proposals have Via Matteotti, 248-25063 - Gardone V.T. (Brescia) ITALY been voted in . . . or out. As dues-paying members, most of you receive that (ulp) used for convoy patrol duties and even $2 is refundable on your first order, too. other publication, which produces as minesweepers, due to their wood Write to Dynamic Models, Drawer "C,” complete rundowns of the rules pro­ construction. Port Jefferson Station, NY 11776. posals, along with the way the board The Dynamic hull builds into a big ★ ★ ★ voted on them. Please, help your board boat, measuring just over 67 inches in "Big Al" Berry, who did the review for member. Write to him. The addresses length and 15 inches across the beam, us on the Steve Muck Prop Pitch Gauge are published in M.A. just about every and is molded strong enough so that no on page 48 of this issue, sends word that month. Those of you who actually internal bulkheads are necessary, giving his o u tfit, R/C B. Products, is now compete should, in particular, express the model-type captain the entire space offering a high-performance venturi as a your opinions to your contest board below decks for installation of his retrofit item for the K&B 3.5 inboard and representative. Speak now, or forever fly equipment. Best part of all is that full- outboard and the 7.5 inboard. The according to the rules you had nothing size plans for the above-deck details, as venturi features a 9.5mm bore (.374 to say about! · shown in the photo, are included with inches) that works with or without each hull. Introductory price of the hull pressure, and a special twin-hole spray Super Buc. . . Continued from page 41 and plans is $165. bar. The body is anodized aluminum, Accessories available for the trawler and you even get your choice of colors ber the airplane . . . a real pretty ship, include the large ventilators molded in . . . blue, red, or black. covered in light blue silk and trimmed in fiberglass, a vacuum-formed plastic For price and availability info, contact white. Someone else had started build­ skiff, brass gallows (trawler frames), Big Al at R/C B. Products, 1623 Missouri ing the fuselage, then gave it to the stanchions, searchlights, chocks, cleats, Ave., Chickasha, OK 73018. younger Johnson to finish up when it etc., etc. Your best bet is to send $2 for ★ ★ ★ was found that the structure had a built- Dynamic's new 36-page catalog and Bill Evans R/C Aircraft is producing a in curve that would do a banana proud. manual, sent first class mail, which shows new type of muffler engineered specifi­ Of course, it goes without saying that the the trawler and 19 other fiberglass hulls cally for the popular K&B 3.5. This piece kid entered it in several Texaco events at and kits ranging in length from 26 to 86 is unlike anything we’ve seen before, Taft and garnered more than his share of inches, as well as all the numerous large consisting simply of a tube, closed at trophies with that "crooked" airplane scale accessories available for them. That both ends, with a series of narrow slots ... mute testimony to the airplane’s forgiving, rock-stable flying qualities. Construction of the model is fairly YES-SIR, YES-SIR, THREE BASS FUI conventional . . . there’s just a lot of it. From all the planking and stringers, one A VAIL-ABLE fyo\ would be inclined to believe that maybe Shereshaw did have a hand in the redesign after all. The airfoil is evidently a zip-zip section, moderately thin and highly undercambered. Because of the thin wing, the diagonals between the 3 / i / n e . vun&ER. o r rL/t/js-Søme. Pr./c£ I top and bottom spars are an absolute WALT MOONEY NOW OFFERS 4-BAGS OF PEANUT SCALE PLANS must; or, as an alternate, you could ALL WELL TESTED DESIGNS, AT ONLY fS.OO EACH substitute 1/16 sheet balsa vertical-grain EACH BAG FEATURES FOURTEEN PEANUT PLANS, shear webs. Spruce spars, maybe en­ ONE OTHER, PLUS PHOTOS AND INFORMATION larged to 1/4-inch square, would be a good idea if building the model for R/C. SENO tl.0 0 FOR COMPLETE LISTING AND SAMPLE PLAN TO: The Super Buccaneer spans 90 inches, WALT MOONEY, 2912 CABRILLO MESA DR. has about 1200 square inches of wing SAN DIEGO, CALIFORNIA 92123 s area, is 57 inches long, and will probably weigh at least five pounds as a free flight,

102 R/C MODEL BUILDER more with R/C. . . this airplane is a flying lumberyard. Speaking of R/C, the ISN'T IT ABOUT TIME YOU STOPPED BEING A HACKER? existing tail surface spars would be perfect locations for hinging the control THE UBER SKIVER WAS DESIGNED TO MEET THE PRECISION RE­ surfaces. For SAM R/C events, a .53 is the QUIREMENTS OF PHOTOFABRICATION. MICROCIRCUITRY, GRAPHIC largest legal size glow or converted glow ARTS PRODUCTION. ETC.. AND AS SUCH BECOMES THE PERFECT engine allowable. An R/C version with CUTTING TOOL FOR THE DISCRIMINATING MODELER. something like an O.S. 4-cycle up front would make a terrific sport flier; you could shoot touch-and-goes all day long and it would never get d u ll.. . The photo that accompanies this write-up was sent by John Pond, as part of his March column; a lucky coinci­ dence, as we were just about to start searching for a Super Buc photo from past issues of MB. The photo shows 12 designer Bill Effinger himself.assembling 11 the original prototype Super Buc at the 1937 Nats in Detroit. Bruce Lester, of Ontario, Canada, who has been supply­ ing Pond with those neat old photos that have appeared in recent issues of RCMB, 10 15 20 I also supplied this one. Thanks, Bruce, • Rear Draw-Bar Clutch uber Skiver Precision Cutting Tool you couldn't have sent it at a more • Instrument-Quality Materials Available in seven satin anodized handle colors: opportune time! • Advance Collet Design Best of luck to those who decide to silver, blue, red, green, gold, black, and violet. • Hex Cross-Section Complete set in fitted hardwood case; includes undertake the Super Buccaneer project. • Deeply Knurled Grip uber Skiver, together with two vials containing We hope you enjoy it. · • Long-Life Stainless Steel Blades four No. 11, and one each of Nos. 10, 12, 15, See your dealer, or order direct. and 2 0 ...... $14.95 Dealer inquiries are invited. Individual handles (specify color) $5.95 Workbench . . Continued from page 6 Vial of 6 blades (No. 10, 11. or 15) $2.10 All direct orders sent postpaid. obtained by sending a large stamped, (No. 12 or 20) $3.30 addressed envelope to Joe Klause, California residents add 6% sales tax. address above. Nominal displacement .15 cu. in. Bore and stroke .575 in. M ODEL BUIL DER PRODUCTS Investment cast crankcase. 621 West Nineteenth St., Costa Mesa, California 92627 Front intake. Rear exhaust. 12mm crankshaft. ABC sleeve and piston. ★ ★ ★ designed by Leon Shulman, powered Advanced design Schnuerle porting. Among those of you who are fans of with a Bantam that I had hopped up. Bronze bushing connecting rod. the Johnnie Carson show, we wonder After the day’s flying, Leon Shulman and Weight approximately 6 ounces. how many have noticed what we feel is Ben Shereshaw (Ben made the Bantam at Various head configurations available. an amazing resemblance between music that time) came around to our room and Various R/C carburetors available. arranger and sometimes leader of the took us to dinner. For the two of us, that “ YOU DON’T SAY” DEPT. band, Tommy Newsome, and the photo was the high point of the Nats. In the National Association of Zim­ of Gene Husting that heads up his R/C Bill continued his winning ways at babwe Aeromodelers Newsletter, South car column in RCM. model contests for the next couple of Africa, we read that Chris Sweatman, BILL BURKS MAXES OUT years, before he reenlisted to continue well-known hobby shop owner in Cape The following letter was just received flying full scale aircraft for Uncle Sam. Town, S.A., won an Open Pylon race from Al Strickland, now living in Lake His military career took him all over the with his "Middle Stik." On the last lap Havasu City, Arizona. world, and he continued to fly models his radio conked out, the model hit the On Sunday, December 74, 7980, mod­ whenever possible. ground at a shallow angle, which action, eling lost a staunch supporter, and I lost After he retired from the Air Force in as it shot back into the air, kicked the one of my oldest and closest friends. 1966, Bill settled his family in Dallas, radio back on again, enabling him to Major William E. Burks (USAF retired) Texas. There he used the skills learned in turn the far pylon and cross the finish passed away. the Air Force, and opened a successful line. The wooden prop was not even Bill was born in Gadsden, Alabama, flying school. He taught corporate pilots scratched! july 23, 7925. His childhood was spent in who were flying conventional engined ★ ★ ★ Montgomery, Alabama, and his young aircraft, to fly executive jet aircraft. Our wildest coincidence in 1980... In adulthood in Birmingham. During his About five years ago, Bill had a series the planning stage for this issue, during early years he became a top-notch of heart attacks that ended his full scale early December, we made the decision modeler, flying free flight and control flying. After his recovery Carolyn (Mrs. to feature Bill Effinger's famous "Super line. Before he was out of high school, Burks) started building and flying free Buccaneer” as the "Old Timer of the he formed a habit that continued flight models with Bill. Needless to say, Month." As usual, our next chore was to throughout his life, winning contests. with a teacher of his caliber, Carolyn dig up a suitable photo of a Super Buc I remember an incident that occurred became a real competitor in a short from one of our past issues. Then, only in 7 946, shortly after we were discharged time. The Burks became a familiar pair at days later, we received John Pond’s from the old Army Air Corps. We en­ free flight contests from California to material for his “ Plug Sparks” column in tered the Alabama State Miniature Air Florida. this issue. You guessed it .. . from the Carnival, in Birmingham. Top prizes at Last Sunday, (as this is being written) batch of photos John sent for the col­ this contest were five trips to the Na­ just after the close of a contest in Fort umn, out popped one from the fabulous tionals, held that year in Wichita, Kansas. Worth, Bill and Carolyn were sitting collection of Canadian Bruce Lester, of Bill and I won trips, and he went on to under their portable shelter, taking it Bill Effinger at the 1937 Nats with his win first place in Class "A " Open Free easy for a few minutes before packing latest model, the Super Buccaneer! Flight at the Nats. He flew a " Zombie” for the trip home. A few minutes earlier MARCH 1981 103 they had learned that Bill had won first 4/74 Stinson T rim o to r...... Don Butman place. Carolyn had started to say, "Well 5/74 Miles Sparrowhawk...... M ooney TWENTY-SEVENTH Willie, you did it again." Before she 6/74 Wickner “Wicko” ...... M ooney could finish the sentence, Bill slumped 7/74 Wittman VW Racer...... M ooney ANNUAL forward off his seat with a fatal heart 8/74 Macchi MB 308 Idro ...... M ooney attack. 9-10/74 Renard R-17 ...... Mooney Bill will leave fond memories with 11/74 Curtiss S eagull...... Pres Bruning hundreds of his modeling friends all 12/74 Stinson Reliant...... Megow plans 1/75 AVR0 534C ...... Mooney over the world. 2/75 Avions “ La Cigale” ...... Mooney If there is a brighter side of his passing, 3/75 "Redhead” Racer ...... Ted Vogel it is summed up in a remark that Carolyn 4/75 Robin HR 100 "Tiara” ...... Mooney made when she called to tell me of Bill’s 5/75 1908 Blériot IV ...... Mooney death. “ Well, Strick, he died doing what 6/75 B.A.T. Baboon...... Mooney RADIO CONTROL he enjoyed most, none of us could ask 7/75 P-47D Thunderbolt .... D. Norman for more." To this I say Amen. 8/75 Castaibert IV ...... Mooney EXPOSITION We met Bill and Carolyn for the first 9/75 Jodel D. II ...... Rex Powell time several years ago at Taft, California, 10/75 1912 B lackburn...... John Blair during one of the NFFS Championships, 11/75 OKAY ...... Don Butman when attracted by the sight of a very girl- 12/75 Roland D -V III...... Ed Heyn type modeler who prepped, cranked 1/76 Davis D A -5 A ...... Mooney up, and released a hot 1/2A ship in a very 2/76 Lanier Paraplane...... Don Brown professional manner. The following 3/76 Spad XIII ...... John Walker hour was spent with a very devoted 4/76 Saab “ Safari” ...... Monty Groves couple who were thoroughly immersed 5/76 Lockspeiser LDA-01... John Walker in the serious business of competitive 6/76 Hergt Monoplane ...... Mooney free flight, yet doing it in a relaxed and 7/76 Bell A ira b o n ita...... Mooney humorous manner that disguised their 8/76 ΟΓ Ironsides (homebuilt) . Mooney 9/76 Hirondelle Monoplane . J.F. Frugoli effectiveness. We wish the very best to 10/76 Udet U-12 ...... Mooney Carolyn in adapting to the new lifestyle 11/76 Nakajima Kl-27a...... Mooney she must now assume. 12/76 Spirit of St. Louis...... D. Norman PEANUT LIST 1/77 Lederlin Flying Flea...... Mooney In a recent ". . .Three If By Air” 2/77 Tupolev AN T-2...... Mooney column, we promised to publish a 3/77 Sorrell Hyperbipe .... Pres Bruning complete list of all the Peanut plans 4/77 Aeronca 0-58A/L-3A...... Mooney published in Model Builder. Larry Ren- 5/77 Aviatik-Berg C -1...... Ed Heyn ger, our "Half-A & Sport Scene" col­ 6/77 Western "Meteor” ...... Al Lidberg umnist, put the list together for us, and 7/77 Morane-Saulnier racer.... Mooney we present it herewith. Most of the plans 8/77 Fletcher FL-23...... Charles Schaaf TOLEDO SPORTS ARENA are still available by purchasing the 9/77 Halberstadt D -ll...... John Walker appropriate back issue. Some are also 10/77 Loire 46 ...... Don Butman ONE MAIN STREET available from our most prolific Peanut 11/77 "Rivets” race r...... Mark Drela TOLEDO, OHIO designer, Walt Mooney, by ordering his 12/77 F4U-1 C o rsa ir...... Mark Drela "Bag of Peanuts," as advertised. Peanut 1/78 Folkens SK-3...... Kurt Enkenhus plans not available from Walt Mooney 2/78 Lemberger LD-20b...... Mooney or from issues that are out of stock, may 3-4/78 Found Bros. "Centennial ” . Mooney 5/78 Upton Baby A c e ...... Mooney be ordered through our plans service, at 6/78 Siemens-Schuckert E-1 .... Mooney APRIL 10,11 $1 each, postpaid. We will provide these 7/78 Swedish Thulin-K ...... Mooney from our complete file of all back issues 8/78 1913 Deperdussin...... Al Lidberg of the magazine. 9/78 Sopwith Pup ...... John Blair and 12,1981 9-10/71 Jodel M ascaret...... Wall Mooney 10/78 Vari-Viggen ...... Steve Gardner 11/71 Fokker D-VI ...... Mooney 11/78 Ikarus IK-2...... Mooney FRIDAY 9 am to 6 pm 12/71 Laird LC-DC ...... Mooney 12/78 Vari-Eze...... Hank Nixon 1/72 Ord-Flume O-H 7 ...... Mooney 1/79 Cierva Autogyro...... Don Drury SATURDAY 9 am to 6 pm 2/72 Ford Flivver...... Mooney 2/79 Dornier "Libelle” ...... Mooney SUNDAY 9 am to 4:30 pm 3-4/72 Bucker lungmann ...... Mooney 3/79 Bristol"Red Devil” ...... Mooney 5/72 Fokker V-23...... Mooney 4/79 Republic XP-47H...... Pres Bruning 6/72 3 Profiles: D.F1. Chipmunk, 5/79 Euler D -2 ...... Mooney presented by Yak-18PM, Speed Spitfire.. Mooney 6/79 Pegna P.C. 1 ...... John Walker 7/72 AVRO "G ” Biplane.... Bill Hannan 7/79 Bellanca Aries T-250 ...... Mooney WEAK SIGNALS, „ 8/72 Taylorcraft w/floats ...... Mooney 8/79 M onocoupe 110 p.o. box 5772 R/C CLUB 10/72 Bellanca Light Tractor . Don Butman Special...... Butch Hadland 11/72 Skyraider...... Mooney 9/79 EAA Baby A c e ...... John Blair toledo, Ohio 43613 12/72 Stahlwerk ...... Mooney 10/79 Lublin R-XII...... Mooney 1/73 Ole Tiger racer...... Mooney 11/79 Martin-Baker MB-5 .... Mark Drela 2-3/73 Travelaire 2000 ...... Don Butman 12/79 C hiribiri N. 5 ...... Mooney 4/73 Evans VP-2...... Mooney 1/80 Alco S p o rt...... Bernard Shulman 5/73 M onocoupe 110 2/80 POGO (Owl Racer)...... Mooney :·:·:·χ*κ·χ·:.·...... ·.·.·.· Special...... Mooney/Pardoe 3/80 Quail (homebuilt)...... Mooney 6/73 Huntington H-12 ...... Mooney 4/80 P-40E Warhawk...... Steve Gardner § P ^ 7/73 Micropiano Veloz ...... Mooney 5/80 Stearman4E...... Tom Cadogan 8/73 Blériot Canard ...... W.C. Young 6/80 Cessna Cardinal RG .. Nick DeCarlis 9/73 Mr. Mulligan...... Hank Nixon 7/80 Gourdou-Leseurre Cl .... Mooney 10/73 Piper Vagabond ...... Mooney 8/80 Farman 1000 ...... Mooney 11/73 Waco SRE...... Mooney 9/80 Hanriot H-19...... Mooney 10/80 Marquart Charger .... Don Butman .ν.·.ν.·.ν.·.ν.·.·.·.;.;ν ...... Cv>:\\v;v.*.V.V 12/73 Speed S pitfire...... Mooney 1/74 DeHavilland DH-6 ...... Mooney 11/80 Jodel M ascaret...... Mooney . 2/74 Culver "Dart” GW ...... Mooney 12/80 Embraer"Impanema” ....Mooney 3/74 SE-5 ...... Mooney 1/81 A e ro -T o rp ille ...... J.F. Frugoli

104 R/C MODEL BUILDER ’£ J l i tu

IDUANCED R/C TECHNOI IN 7 ECTRA SERIES Meet the challenger in the R C field. JR's SPECTRA SERIES A composite of advanced electronic R C design and engineering utilizing the latest knowledge and experience from space age electronics Modern in­ tegrated components as well as mechanical engineer­ ing features never before offered to the hobbiest. JR's and CIRCUS HOBBIES' dedication to quality and service ake the SPECTRA SERIES the logical choice for cham­ pions and champions to be.

.STEM 7C-4SH (Transmitter illustrated)

Dual aileron and elevator rates. 2 auxiliary trim func­ tions located on top of transmitter Retract function. NET-127 Transmitter NER-227 Receiver. 3 NES-101 Servos 1 NES-102 Servo [reverse) 500 MAH Receiver Battery Pack Charger Aileron Extension Cord " Y" ' Harness Servo Trays Necessary hardware

SPICTRAWMS- ΛΗ r.ONTHOL rate’s YOUNG STAR GLIDER IT’S CONPLETE SINPLE AND IT PERFORMS BEAUTIFULLY

A “ COMPLETE” DIFFERENCE... This Young Star is the most installation of your radio. complete and versatile glider kit you It couldn’t be simpler. characteristics. can buy...and at a remarkable Whether you’re a novice looking price. Sure it’s maneuverable and EASY PIECES... to get some fun and excitement out easy to fly, but For instance, the Young Star’s what makes it fuselage (a big 31 inches) comes in different is that one impeccably finished piece. This unlike so many not only saves time, but gives your others, this one finished model a crisp, smooth, pro­ is totally com­ fessional look. At the same time, the plete and wing goes together with just two actually easy to precisely molded pieces. The whole assemble. You kit is almost as much fun to build Unlike conventional won’t start as to fly. glider kits, the Young building only to Flies with 2-channel radio tor rudder and Star comes with .049 elevator control. size engine pod find yourself Pod also available running down of a two channel system, or you’re separately. to the hobby already an established glider pilot or shop to buy some missing hard­ Sunday sport looking to test your ware. Ifs all here in the box. Hinges, skills hunting up the thermals, MRC’s control horns, push rods, tire, Almost-Ready-To-Fly Young Star canopy, and decals. And that’s not is just the ticket. all. We also include a power pod as Comes complete with tow hook lor high well as a built-in tow hook. start launch. Take it up and you'll find our low See it at your hobby dealer... A VERSATILITY THAT GETS density foam design makes for long YOU OFF TO A FLYING START... and by the way, check out the soaring sessions and excellent flight economical price, thaťs the Mount an .049 engine to the pod most fun of all. for power launch or ready it for tow All the hardware is here, easy to assemble takeoff. Assembly is a snap. Our and complete Engine nol included

step-by-step instructions Model shown here has will take you through the been finished in color for procedure right through photographic purposes.

Model Rectifier Corporation, 2500 Woodbridge Avenue, Edison, New Jersey 08817