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Why settle for less than the uncompromising quality and craftmanship of ŠR maker of the most programmable radio in existence!

HERE ARE SOME OF THE FEATURES: • Dual Rate Elevator • Dual Rate Rudder • Triple Rate Aileron • Three Snap Roll Buttons • Preset Throttle Button • Elevator/Flap Mixing • Rudder/Throttle Mixing • Flap/Spoiler Mixing • Flaperon Mixing • Elevon Mixing • Servo Reverse Switches • Servo Travel Adjustment • Direct Servo Controller • Plug-in Frequency Modules

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XL SERIES Radio Control No. 9160 Channel System The same quality and reliability necessary for world record setting is found in all Airtronics XL R/C Systems. While record setting may not be of interest to you. the factors of quality and reliability should. For increased enjoyment of R/C you owe it to yourself to experience an Airtronics R/C System. See your local hobby dealer for more information on all of Airtronics and K&B products.

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1 2160 W oodruff Ave., Downey, CA 90241 A DIVISION OF LEISURE DYNAMICS HOBBIES. INC 1000 FUEL Telephone: (213) 862-6583

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World records are not new to K&B! K&B MANUFACTURING Of course we're proud to be part of the new record established by the Magnum 1 2152 Woodruff Avenue, Downey, CA 90241 Racing Team. The very accomplishment itself proves that the K&B 7.5cc A DIVISION OF LEISURE DYNAMICS HOBBIES INC Telephone: i213) 923-5493 Inboard Marine Racing Engine and K&B 1000 Fuel are products of quality and reliability. So that you, too, may enjoy the pleasure of reliable boating, we suggest you try this winning combination — an Airtronics R/C System and a K&B Engine using K&B Fuel. M O D E L S JANUARY 1982

BUILDER volume 12, number 120 621 West Nineteenth St., Box 335, Costa Mesa, CA 92627-0132 Phone: (714) 645-8830

STAFF CONTENTS EDITOR/PUBLISHER Wm. C. Northrop, Jr. FEATURES W ORKBENCH, Bill Northrop...... 6 GENERAL MANAGER Anita Northrop O VER THE C O U N T E R , lohn Elliot ...... 7 R /C W O R L D , John Elliot...... 10 ASSISTANT EDITOR John Elliot BYRON P-51 REVIEW, Skip Ruff...... 14 ASSISTANT GENERAL MANAGER C H O PPER C H A T T E R , Ray Hostetler...... 22 Dawn Holcomb JR R A D IO R EVIEW , Chip Conklin...... 24 “ 1 TO 1” R/C SCALE, Bob Underwood...... 26 ART DEPARTMENT FUEL LINES, Joe Klause...... 28 Al Patterson ELECTRONICS CORNER, EloyMarez...... 32 OFFICE STAFF R /C S O A R IN G , Dr. Larry Fogel...... 34 Edie Downs PLUG SPARKS, lohn Pond ...... 37 Debbee Holobaugh R /C P Y LO N , Jim Gager...... 42 A. Valcarsel R/C POWER BOATS, Jerry Dunlap...... 44 CONTRIBUTING EDITORS R/C AUTO NEWS, Dan Rutherford...... 46 Dave Brown Joe Klause ELECTRIC PO W ER , Mitch Poling...... 48 Jerry Dunlap Walt Mooney SPORT SCENE, Larry Renger ...... 50 Larry Fogel Mitch Poling T H O R N B U R G A T LARGE, Dave Thornburg 51 Jim Gager John Pond H A N N A N ’S H A N G A R , Bill Hannan...... 52 Bill Hannan Fernando Ramos Dick Hanson Larry Renger CONTROL LINE, Dan Rutherford...... 58 Ray Hostetler Dan Rutherford FREE FLIG H T SCALE, Fernando Ramos...... 60 Tom Hutchinson Dave Thornburg IN D O O R FAI TEAM TRIALS, Jose Tellez . 62 Ken Johnson Bob Underwood FREE FLIG H T, Tom Hutchinson ...... 64 ADVERTISING John Elliot Wm. C. Northrop, Jr. SCALE VIEWS MODEL BUILDER (ISSN 0194 7079) is published monthly by RCMB INC., 621 DOUGLAS A02D-1, Nick Karstens West Nineteenth Street, Costa Mesa, Cali­ fornia 92627. Phone (714) 645-8830.

Subscriptions: $25.00 per year, $47.00 for two years. Single copies $2.50. Add $3.50 per CONSTRUCTION year for postage outside the U.S. (except MODEL BUILDER RAVEN, Dave Jones...... 18 APO and FPO). U.S. funds only, please. SUPER G SHARK COLLECTOR PLAN, vkstanzel ...... 36 Copyright 1982 by RCMB INC. All rights reserved. Reproduction without permis­ Ed Lidgard...... HI-HO, O.T., 41 sion prohibited. PEANUT LAIRD LC-DC, Wall Mooney...... 53 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 not forward copies unless you pay extra Cover: Skip Ruff, Taft, California, with his Quadra powered Byron P-51, using Futaba postage. Duplicate issues cannot be sent. FP-6FN radio. He modeled it after the "Mangia Pane" (loosely translated to mean "Free Loader"), owned by Bill Destefani, of Bakersfield, California. Flown by Ron Hevle, the Second class postage paid at Costa Mesa, big one placed First in the 1980 Silver series and Third in the 1981 Gold series at the California, and additional offices. Reno A ir Races. Skip reviews the Byron P-51 beginning on page 14. Photo by Alan Davis.

2 MODEL BUILDER

WE PUT THE THRILL BACK INTO R/C*

. . . been flying your Revolution I for five years. I know For a beginner in R/C Flying I feel you have come up the quality of your products and have been delighted to with a real big winner - both construction and flying . . . recommend your machines to my flying friends. Thanks keep up the good work. for another fine product that we can all afford! STANLEY A. LEWIS. Age 27 Florida RUSS RHUE. Age 46 California This kit is the most complete and comprehensive I 1 was surprised at how easy it is to assemble! have ever had. Assembly is a breeze with your fine PAUL MASTERS. Age 15 ■ Ohio instruction booklet and photographs. WELDON I. HALTOM, Age 32 · Texas . . . wanted one for years. I am truly amazed by the stability of flight I get from my Mantis. Prior to buying my I’m quite pleased with the way the kit was packed and Mantis I had flown only gliders, yet within 3 days I was packaged · it appears to be the best kit I’ve ever purchased. making coordinated turns, safe landings and nice long THOM AS C. HENRY, Age 35 Canada flights. I think the Mantis is truly a great helicopter kit! GUY ROY. Age 17 C alifornia It flys great, hovers very well.. .1 love it very much. Can’t wait until I get the new Super Mantis. I am sending you a The Mantis has a major acceptance here in Rio, picture of my new Mantis. I hope you like it. P.S. - Keep up because of the high quality materials employed associated the good work. Happy to fly the “ American R/C Way” . with an exceptional low price. That’s Great! FRANK R. CASPER. Age 28 New Jersey ANTONIO CLAUDIO JAMEL, Age 19 Brazil 'OUTSTANDING!!! Exceeds all expectations, we use I have long been desiring an R/C helicopter. At this O/S Max .40 . . . plenty of power! (after) 4 years flying full cost, yours is a dream come true!!! size aircraft, fixed wing, this model put the thrill back into CECIL R. PARRISH. Age 33 Illinois R/C. Look for more orders . . . my friends want one too! All claims of ruggedness gladly confirmed! Instructions are very clear. I’m glad to own a Mantis! CARL P. DEAL Jr.. Age 39 - Florida DAVID GUERRA, Age 16 Texas This is the finest kit I have ever purchased. I have been a modeler for 50 years — I am a tool maker and I know quality. This is the best! You may use this recommen­ MANTIS dation for advertising. FIXED PITCH H.H. MOORE. Age 62 Texas

Still $169 Price subject to change without notice.

American For Further Information Call or Write: (714)744-7533 R/C Helicopters, Inc. 635-11 North Twin Oaks Valley Road · San Marcos, CA 92069 ■ 4 MODEL BUILDER UTEST ADDITION TO THE M m * SERIES

ENGINE SIZE: 60 WING SPAN 64 " SQ. IN.: 648 LENGTH: 48" RADIO: 4 TO 6 CHANNEL WEIGHT: 8 - 9 LBS. ^ S IG s f $89.95

MUS I ANG Designed by HANK POHLMANN

K m * 8ftr~ IDEAL FOR RC SPORT SCALE OR SPORT FLYING An all new SIG kit of an old favorite. Designed for Sport Scale and Sport h e r e a r e t h e o t h e r k it s in t h e k w ik b il t l in e Flying. The Mustang has exact scale outline and the wing features tip camber and washout. Building instructions include photos showing op­ tional flaps and retracts installation. Molded plastic fuselage.

RC super c hipm un k KIT KBRC 1 S84 95 SEE YOUR DEALER FIRST! TO ORDER DIRECT, ADD S1.00 POSTAGE FOR ORDERS UNDER $10.00. POSTAGE FREE OVER $10.00. NO C O D. ORDERS. SEND S2.00 FOR THE LATEST CATALOG OF KITS, ACCESSORIES AND SUPPLIES BY SIG AND OTHER MAJOR COMPANIES. SIG MANUFACTURING CO., INC... Montezuma, Iowa 50171 JANUARY 1982 5 When you come up with a good design, stick with it. There was a 7/8 Big John called the "Duster” (Plan No. 3791) and this K&B .15 powered "Galloping John" (used Galloping Ghost w o r k b e n c h system) which was published in August '65 M.A.N. If anyone has a set of full-size plans, we'd like to borrow them for copying. Our originals were lost some time ago. Four-channel should be easy, these days.

LEROY COX issue of Air Trails, because in our opin­ With sadness we must announce the ion, it was a better looking model than death of Leroy ("Roy” ) Cox, 75, of most of the R/C jobs that were pub­ Corona del Mar, California. Roy was one lished under his name in M.A.N. some of the true pioneers of model aviation. years later. Although Model Aviation He was probably responsible for intro­ knew that we were going to present the ducing the fun of engine powered plans, apparently there wasn’t enough control line flying to more young mod­ time to clue us about the true designer elers than anyone else in the industry. of O.S.S. in time for us to give proper Roy founded his company right after credit. World War II. Starting out with wooden We did an article under the name of pop guns, he switched to die-cast model "Bill Crocker” (my mother’s maiden race cars when metal became available. name) in M.A.N. during our stint as that The miniature race cars were so authen­ mag’s R/C Editor. In that case, it was tic, modelers were soon fitting them Leroy Cox, in 1967 done because we already had quite a with small model airplane engines for few bylines in that issue in our own power. It did not take Roy long to tool Roy was an enthusiastic pilot of full size name. up his own engine and put out the aircraft. He was licensed to fly gliders, PARACHUTE NYLON complete car, engine and all. In 7952, the single and twin engine aircraft. Roy’s red Back in the late ’50s and early ’60s, the interest in model race cars slackened and white checkerboard "TD-3” N avion Delaware R/C Club, through this writer, and Roy decided to diversify into the was a familiar sight at airports where used to purchase bulk quantities of model airplane field. Having developed model contests were held during the parachute nylon from a parachute expertise in producing small car en­ 7 950s and ’60s. manufacturer. We’ve long since forgot­ gines, he naturally concentrated on Having sold his company in 1969, Roy ten the name of the supplier and can 1/2A size airplane engines. The .049 retired, but he retained a keen interest only recall that the company was located Space Bug was the first of a long line of in model flying and in the hobby indus­ in a northeastern state. The material was Cox model airplane engines, but the try. He continued (o attend the annual extremely light in weight, and of course, engine with which Roy brought model HIAA trade show until last year, when buying a large roll made the price airplane flying to literally millions of health precluded his attendance. extremely right. It had onlyone possible youngsters was the .049 Babe Bee. This Pioneers like Roy Cox are few and far fault. The nylon had what was called a engine, which originally retailed for between, and modelers the world over “ rip stop” weave, in which thicker $3.95, has been in production continu­ are fortunate to have had a quiet, and/or multiple strands ran through the ously for 27 years, with tens of millions unassuming gentleman like Roy Cox material in parallel and perpendicular being produced. dedicate his career to their hobby. directions, forming a criss-cross pattern Cox competition engines have been By Bill Selzer of about 1/4-inch squares. With a clear consistent contest winners because of SPRAGUE VS. WINTER dope finish, which most of us used, this Roy’s insistence on perfection in per­ Yes, Ernest Harbin, of Flushing, M ichi­ pattern was not objectionable; but formance and quality. Roy was first in gan, we were suckered into believing where colored dope was used, such as the industry to use highly sophisticated there was a John Sprague, and published on a scale-type model, the pattern measuring equipment, such as air plans for “ Old Square Sides” as Old would show through in the surface gauges, to hold tolerances as close as 25 Timer Model of the Month in our texture . . . unless numerous coats, with millionths of an inch in manufacturing October ’81 issue. Don’t know why Bill sanding in between, were used to pistons and cylinders. Winter chose to use a pseudonym when Although not an active model flier, "O.S.S." was presented in the July 1940 Continued on page 106 6 MODEL BUILDER OVER THE COUNTER

A ll material published m "Over the Counter" is quoted or paraphrased from press releases lurnished 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

• Sterling Models, Inc. proudly an­ nounces that its Balsa Model Kit of the World’s Record Winner "Real Sporty” , has been published in the September 1981 issue of Commercial News USA, a trade publication, published by the U.S. Department of Commerce, Interna­ tional Trade Administration, Washing­ ton, D.C. The "Real Sporty” Kit, #K6, is the third balsa model to be recognized by this publication. This Worldwide Commercial Newsletter reaches over “ Real Sporty" by Sterling Models 200,000 prospective buyers around the world and contains information on new American products and technology developments at home and abroad. Chuck Andrews, of Ashley Heights, Virginia, the pilot of the real "Real Sporty” was invited to receive an inter­ national award in Tokyo for breaking three world flight speed records in 1980. Andrews traveled to Japan in October 1981 to accept the Louis Blériot Medal, awarded annually for achievements in light aircraft flying. "Real Sporty” , owned by Paul Musso, posted a 235.77 mph average for the three kilometer speed record. Well-known designer, George Owl, developed this new For­ mula I aircraft. For the rest of the story, write to Sterling Models, Inc., 3620 "G ” Swivel-neck pilots by Williams Brothers.

JANUARY 1982 7 Three H.L. gliders by Campbell's Custom Kits (I to r): Tiny Piglet, Thermal Piglet, Merlin 2.

Airborne pack solar charger, by Departure Co. Automobile charger for McDaniel IMi-Starter.

St., Philadelphia, PA 19134. tuning slugs, while the other end has a ★ ★ ★ ★ ★ ★ recessed tip for slotted, threaded shafts. The Williams Bros., purveyors of fine Now available from Ace R/C is the Complete with clip so you can carry it in scale items, has released the latest in Ace tuning wand, especially designed your pocket. R/C’able items! At the moment, avail­ for (he small coils, IF's, and trim pots Ace R/C, the electronics kit people, able only in two-inch scale, Standard being used in receivers and transmitters. have solved a big problem for the glider helmet and goggles, or Sportsman pilot One end has a small metal tip (doesn't guider, or pattern person who has form, this pilo t’ may be assembled with effect tuningl for slotted, powdered iron special battery pack configuration prob­ the head tilted, turned to one side, or lems. If a slender sailplane fuselage, or pattern bird with critical tank/nose gear area is bugging you. check out Ace’s'in­ line' battery pack kits. Available in four sizes: 250, 450. 550. and 1200 mah. The kits contain four cells of the required capacity, solder, wire, proper size of heat shrink tubing, and instructions to make either an in-line pack, or a two, two-cell configuration. You provide the connector to match your system. For more information on these items and other goodies, including the Silver Seven Series, send $2 for the Ace catalog. Ace R/C, Box 511, Higginsville, M O Insulated tuning wand from Ace R/C. 64037. Catalog of Dynamic Models products.

Don't light 'em. they're not dynamite! Battery kits from Ace R/C. New automatic fast/trickle charger by Delta.

8 MODEL BUILDER quick and easy engine starting. The “ BUZZ-BOX” also maintains a constant plug temperature, clearing floods in­ stantly, and is adjustable to drive both Wings o f Man, by Jack L. King. normal and R/C plugs. The unit features its own rechargeable looking straight ahead. However, in­ battery, is compact and draws power structions included indicate how to very only on demand. It is short-circuit proof simply modify the head so that it may be and cannot destroy itself from overload. turned or activated by the rudder or an Suggested retail is $49.95, ready to use, aux channel servo! At better hobby or $29.95 in kit form. See your dealer, or shops, everywhere. Williams Bros., 181 order direct from: Wings Engineering, New 16:1 ratio winder by R.M.S. Tooling. Pawnee St., San Marcos, CA 92069. P.O. Box 3352, Stamford, CT 06905. * ★ ★ ★ ★ ★ adjusted. Other features are a cool Hobbypoxy Products, a division of McDaniel R/C Service, manufacturer running switching constant current Pettit Paint Company, has announced of the ‘Ni-Starter’ featured in Over the regulator. Three expanded voltage the introduction of colorful new labels Counter September, 1981, now offers a scales are included, with one scale for its entire line of paints and finishing fast charge adapter for the forgetful or sensitive to two millivolts for use in materials. The various paints and related active modeler. Should you need a top- monitoring small battery voltage products now carry a full four-color off charge (from starting all your bud­ changes if you want to watch the opera­ rainbow logo, while the resins and fillers dies' engines) at the field, or because tion of the peak detector circuit. The carry the same logo in solid orange. you simply forgot to charge it overnight charger will automatically peak detect Write for the free brochure on build­ with the regular charger, simply plug the on 4 to 6 cells of 250 to 1200 mah ing and finishing the Hobbypoxy way. ‘Fast Charge' adapter into the cigarette capacity. It w ill also quick charge 8-cell Hobbypoxy Products, 36 Pine St., Rock- lighter of your car or van, and in 30 to 45 transmitter batteries but must be manu­ away, NJ 07866. minutes, depending on the charge ally terminated. The power supply ★ ★ ★ remaining in the Ni-Starter, you are required can be either a 12-volt battery Dynam ic M odels has released its ready to go. At your dealers or contact: or a 12-volt battery charger. Available at 4th edition, 52-page catalog for the R/C McDaniel R/C Service, 1202 Bryan Ave., hobby shops now, or get in touch with: scale model boater. This new catalog not Bellevue, WA 68055, or call Bob at (402) Delta Mfg. Inc., 27 Racecar Court, only shows Dynamic’s line of scale 291-4287. Lorimor, IA 50149, or call (515) 763-2220. fiberglass hulls and kits (1/4 scale, 24 ★ ★ ★ ★ ★ ★ inches to 86 inches in length), but also Delta Mfg., Inc. has just released its Campbells Custom Kits has released a fully illustrates over 250 fittings and new Peak Detector Charger, Model line of high quality, hand launched accessories for the scale model boater. #BC804PD. This new charger offers an glider kits. Ranging in size from 14 to 18 Cost of the catalog is $3, and sent via first automatic shut off at peak battery inches in span, the kits feature pre-cut class mail. The $3 is refundable against voltage during 2-4C quick charging fuselages of spruce, wing material with your first order, too. Send to: Dynamic rates. This accomplishes a safe means of tapered trailing edges and tail feathers Models, Drawer C, Port Jefferson Sta­ packing as much energy into the bat­ cut from select quarter grain balsa. tion, NY 11776. teries as possible in 15 to 30 minutes. The Materials for a swing weight dether- ★ ★ ★ charger requires no further attention malizer, along with full size plans, are Wings Engineering has introduced a once the quick charging current is Continued on page 105 new plug driver and combustion analy­ zer that takes the guesswork out of starting model engines and gives quick starts every time. Simply connect the "BUZZ-BOX” to your glow plug, flip the prop and listen! The change in pitch emitted by the "BUZZ-BOX” will let you know exactly what is happening inside the combustion chamber; whether you have a shorted, open, defective, or fouled plug, or even a lack of fuel or an incorrect fuel/air mixture. You will Prather Products' Prather 46 Deep Vee for .60 to .90 engines. know exactly what to correct to insure JANUARY 1982 9 The saga of the Meyer brothers' Hughes flying boat, flown by John Elliot, continues. This is flight number seven, at Lake Mead, near Las Vegas, Nevada, in connection with the 1981 Quarter Scale Aircraft Association Las Vegas Fly-In. S'WORLD Text and Photos by JOHN ELLIOT

• Let’s start off this month with a little have your attention, for a one-year quiz and see if we can get your attention. subscription to Model Builder, name the The earliest postmarked letter (nophone pilot who originated this maneuver, calls, please!) will be the recipient of a literally translated to mean “ headache.” one-year subscription to Model Builder. Address your answer to my attention, MB Assist. Editor and Merle Meyer confer A lot of Sunday sport fliers, grand­ c/o MB. with Max Stanley. Northrop test pilot for the standers, hot-doggers, and would-be We have a translation (loosely de­ B-35 flying wing, the next Meyers brothers Smilin' Jacks like to attempt this maneu­ fined, that is), now an explanation (also large model project. ver,someget lucky and get it right, while loose) of sorts . . . an inverted snap-roll thods of entry was described many years others come close and are content with from which the aircraft tumbles more or ago in an aviation magazine by a noted it, thinking they have pulled it off. Most less end-over-end, depending on the aerobatic jock. Remember that altitude fliers don’t understand this neat ‘hap­ presence of yaw. Ya’II understand, so is insurance, so stay reasonably high pening’ and the basic mechanics of what far??? We will endeavor to explain how until you have it sorted out, for obvious makes it work! to do it, entry technique, and tweaking reasons. .. What are we talking about? Why, the of the bird to insure proper entry into Let’s assume you entered the box area "LOMCEVAK,” what else? Now that we said flip-flop. One of my favorite me­ from right to left. Pull up into a 45-

Hercules struggles onto step on wind-swept waters on Lake Mead. Bill "Satellite" Hunter fits damaged float pylon together. Can't On previous attempt, one float dug in, with results shown at right. imagine what he used for adhesive. Goose photos by Holly Hunter.

10 MODEL BUILDER Oave N ew 's tw in Quadra powered Cessna Bob Gillespie's Best Finish Award Fairchild The F-27 flies past. Quite heavy, its airspeed, Skymaster taking off at Las Vegas. Piloted F-27 starts to rotate on take-off run. with two K&B 61 ’s was on the hot side. by Joe "hands" Aguilaria.

Carolyn Harlan steadies Frank Comyns' Great Lakes against the Northrop P-61 "Black Widow" by Harry Darrah and Bob Reinish, wind (note flags). Construction article coming very soon! span 11 feet. Kawasaki 3.5engines. Riverside to Vegas flight planned. degree climb, perform a 1/4-roll to the left (so you can see the top of your bird), add some top rudder (right) to hold the attitude and bleed off some speed. Now, apply, all at once, full down elevator, full left aileron and full right rudder. Presto ... a textbook Lomcevak! If you con­ tinue holding these control imputs, an inverted spin will result. What? You say your super-trick Acro- Whiffle won’t do it? OK, let's try a few things, but before we do, you might want to try a less spectacular method of entry, and that is to start from an in­ verted, outside loop. Wait until you are at about one-third the way around before you apply full right rudder, full down elevator and full left aileron. Some Jorg Vogelsang powered his 1/3-scale Sopwith Pup with his own 7-cylinder radial made from birds respond better from this method. O.S. 60 four-cycle parts. Had delicious sound! Quite a few models have semi-symme­ trical sections that stall quicker inverted. of fuel (almost empty), go easy on this rotation to move aft through the fuse­ Here again, some birds will respond tweak, move the balance point aft about lage to get the ‘tumble’ underway. better to full left rudder and full right 5 percent . . . carefully, now, a flat, Sometimes, removing some power as aileron, depending on the tweak or inverted spin could result. Now the you enter the maneuver will help to possible out-of-trim in a given model. If prime reason most sport models won't accelerate the rotational forces working you have picked up your tranny by now oblige our efforts . . . too much hori­ on your 'Whiffle. and have gone through the motions of zontal tail area. Usually, some extra To those who have persevered this far executing the maneuver, you should rudder and elevator throw will help and to those brave souls who have tried have noted ‘where’ the sticks wind up encourage getting the pivot or center of and mastered this show stopper, cheers, . . . And, it makes no difference if you fly a Mode 2 or that other mode (propor­ tional reeds, er, Mode 1). No need to rekindle that old argument again, is there? And you overlooked 'salad bowl- drivers (single stick to the Charlie come latelies who have not had the pleasure of flying 'Single Stick'), simply push the stick for down and left, while twisting right. Why won’t your super-trick Acro- Whiffle do the 'headache' for you? Balance point, plus a full tank of fuel spells nose heavy. Try it on a partial tank JANUARY 1982 11 Glenn "Ode" Odekirk, former Howard Hughes associate, told entertaining anecdotes about Mel Santmyers' clipped wing Rearwin making smoke pass. Thumbs and altitude caused it to "the man" at QSAA banquet. "purchase the farm " a little later on. California television personality, had put together a one-half hour special, including interviews with John K. Nor- trop, just before his untimely death. The man, his accomplishments, and beliefs were presented in such a manner that, after John Northrop died, Clete Roberts, himself an aviation enthusiast, re­ searched further, and a one-hour spe­ cial was presented, the original half- hour program, plus live interviews with ranking Air Force people involved with the original project, including test pilots, Former World Scale Champ, Canadian Bob such as Max Stanley. Now, do you need Nelitz, with incredibly detailed. Quadra powered, 1/3-scale J-3 Cub. Towed banner. to ask? Try the XB-35 Flying W in g ... Should this program ever be presented Goose.’ They had, indeed, built a .60 in your area on the tube, by all means, trainer type, since fitted with floats, and catch it. It aired in Southern California both have acquired some dual time on on Channel 28, a PBS station. A suntanned, fully recouperated Carl Gold­ it. The following dissertation is about As mentioned previously, the project berg, talking models, large and small, as usual, their latest project. is underway. Much help, drawings, and at QSAA fly-in. In the early spring of 1981, the scale interviews were graciously provided by plans lists became quite dog-eared in Northrop Aviation, including a special and now goaddsmoketoyour 'Whiffle... casting about for another exciting pro­ interview and rap session with Max Once again to those who took notes, ject. Over a libation or two, after a Stanley, the prime test pilot of the B-35 who invented it??? particularly good session with the Her­ and B-49 series of flying wings. In a word, ★ ★ ★ cules, the die was cast. Most modelers, fabulous!!! Many myths and old wives A quick update on the two gentlemen Darrell and Merle being no exception, tales about the ‘Wings’ were dispelled brothers who were not told by anyone strive for, and want to do something by Stanley. (Note: at this time, a project that an eight-engined, R/C flying boat original, i.e., not yet built and/or flown is underway to restore to flying condi­ should not be one’s first scale project... successfully. Research was initiated, tion, the remains of the N9M, one-third I’m speaking, of course, of Darrell and credibility was established, and the scale version of the real B-35s, pictured Merle Meyer, co-designers, builders, project was underway. in R/C World, page 15, August 1981 and owners of the HK-1 Hercules, better What was the catalyst? Simple. . . Model Builder.) Wingspan of the Mey­ and affectionally known as the ‘Spruce Clete Roberts, well-known Southern er's ‘Wing’ is about 14 feet, power to be

Builder/pilot Bob Florenze, Brooklyn, IM.Y. PARC's Club, polishes Steve Strickler, Baltimore, MD, took First in Masters at R/C Club of his Violett Skyhawk. Photo by Bud Gay. Conn, meet, 8/30/81. EU1A, YS engine, Futaba. Bud Gay photo.

12 MODEL BUILDER Linda Lukacheck, with husband Wayne's "Brushf ire" (MB plan No. What tail is this? It's quarter scale, and the whole airplane w ill be 4801), Allentown, Pa. Photo by Bud Gay, Bristol, Conn. presented in MB sometime in the future.

four K&B pumper 61s, and construction is well underway.. . Progress reports will be issued in a timely manner... ★ ★ ★ As many of you may have noticed, Lee Taylor’s column, ‘Giant Scale Flight Line’ has been conspicuous by its absence. The pressures of work, time, etc., has caused Lee to request relief from his chores, with a promise of an occasional article now and then. We have ‘searched the world over’ (twisted his arm is a better word!) and have appealed to one Rex Perkins, a lover of big, scale air­ Hank lltsch's 1936 semi-scale Buhl Pup (MB plan No. 91074-0.T.l exudes all kinds of character planes to throw his typewriter into the as it p u tty -p u tts b y on a low pass. Span is eigh t feet. arena. Hopefully, Rex will be starting with the February issue, with coverage evening was Glenn Odekirk, better Hughes. A most interesting speaker, too on Las Vegas. We will touch lightly on known as "O de.” Odekirk had been bad the evening was so short. . . 'Vegas in a general way. associated with Howard Hughes for over The new flying site was met with For example, if the number of people 30 years, was instrumental in forming the mixed emotions, mostly good. The at the Saturday evening banquet is any Hughes Aircraft Company, built the general feeling was the RV parking indication of the growth of ‘quarter Dick Palmer-designed H-1 Racer (now (some, when asked, refused to move), scale’ (over 500 rep orte d), then the in the Smithsonian), and was General the pit area, and spectators were a "m ite movement, or this portion of the hobby, Manager of Hughes Aircraft during the close” to the active runway, as a few is alive and well, indeed. . . Along with inception and construction of the 12- airplanes in distress were to prove o u t... happy hour, good fellowship, and beau­ inch-to-the-foot Hercules. Ode related Dust (as in years past) was zilch; Friday, tiful trophies, the guest speaker for the many an interesting story about Howard Continued on page 105

George "L ittle Toot" Meyer and his scratch-built two-cylinder engine turns 18x6 prop at 7000 rpm. A ll machined from bar stock. Runs on spark or glow .. . best on glow. His next project is a 9-cylinder Gnome rotary! JANUARY 1982 13 BYRON P-51

By SKIP RUFF .. . Special PRODUCTS IN USE report on the 1/5-scale with approximately 3 degrees of side Byron Originals P-51 kit, which includes a Quadra engine and reduction thrust, which saves a tremendous drive system. The retract gear option and fiberglass finishing kit are also amount of work for the builder. The basic kit consists of all material included in this review. needed to build the non-retractable version of the model, except for radio, covering material, paint, adhesives, and • When Bill Northrop first asked if I fiberglass, none with retracts, and had normal shop tools. I elected to get the would be interested in doing a "Products never flown a model this weight and optional retracts (what would a Mustang in Use” article, I thought for a moment size. I questioned Bill about the wisdom be without them?) and also the glass kit. of the neatest, most expensive, most of his choice of builder, but he just said, As inspection of the four-piece fiber­ desirable model I could imagine. I said "A h, you can handle it,” and hung up. glass fuselage revealed factory installed jokingly, "Sure, and I'll be expecting my I figured he must have known some­ bulkheads, and the glass was remarkably Byron Original P-51 in the mail shortly!" thing I didn’t, and so I spent the next light for its size, although it did seem to Like many other modelers I had been couple of weeks in eager anticipation. me to have an abnormally large number watching with drooling interest the The U.P.S. man fin a lly arrived and of bubbles and pinholes on the surface, progress and changes this 1/5-scale dropped off two huge boxes and one especially around the panel lines. As aircraft had been undergoing since the small one, containing the kit, with re­ mentioned, the power plant/drive sys­ .60 powered, fixed-gear version had tracts, and the glass kit. When I opened tem comes factory installed in the main been introduced (but never sold) almost them I was awestruck. Never, have I seen fuselage section. four years ago. Well, Bill called a couple so much model airplane. I must have Really, Byron Originals is to be com­ of weeks later and said, "Hey, your taken packages and pieces out of the mended for its efforts to reproduce a Mustang is on its way.” This immediately boxes for two hours. Everything was very realistic drive system. Anyone who has induced a severe case of euphoria, but well packed and no damage was in­ ever seen a full size World War II fighter eventually I began to calm down. Then I curred. I immediately noticed that the fly, immediately notices the impressively got to remembering that I was primarily Quadra engine and reduction drive large and slow-turning propeller. Im­ a sport flyer, had little experience with system were already factory installed pressive because one realizes that it takes a “ brute” of an engine to turn a fan that large. Sadly, up until now, this had been one aspect of modeling not covered by kit manufacturers of both large and small fighters. It is disappoint­ ing to see a beautiful scale model with a direct-drive engine and tooth-pick two- bladed prop which completely disap­ pears in flight. Of course, the disadvan­ tages of mechanical complexity, weight, and thedifficulty of selecting a propellor which will allow both a decent climb without lugging the engine and a fair turn of speed without over-revving (solved by the variable pitch prop on full size aircraft), all have to be considered. All in all, I believe the factory made the right choice, and that goes for the Dead-stick landing after premature engine cut. Size of almost-scale prop is really in evidence Quadra engine also. The same level of here. Futaba FP-6FN six-channel radio system used. performance could probably be had 14 MODEL BUILDER with a hot .60 or .90 (due to lighter weight), but engine cost, fuel cost, and in-flight sound make the Quadra the logical choice. Although the Quadra may not sound much like the V-12 Merlin in the full-size craft, it is certainly closer to it than a .60 or .90 turning 16,000 and drinking expensive fuel at an astro­ nomical rate. The sight of the Quadra sticking out of the right side of the fuse­ lage is really quite unobtrusive. A special exhaust pipe for use in the Mustang, along with the pieces needed to adapt the engine to direct drive for use in another model, are also included, along with complete engine instructions. The drive system itself is well made and utilizes twin GatesV-beltsturningthe24" X 15" four-blade prop with a 2.5 to 1 Taft's famed K itty Litter plant, so well known to free flighters, marks the location of the test reduction. The prop is about three flights. Shadows indicate the time as early morning. inches shy of being scale diameter, but this cannot be seen without a ruler, and treat is the reprint of the P-51 training the effect is still there. The prop blades manual issued to pilots during World appear to be made of nylon and are War II, which provides for some very nearly unbreakable, however, blades interesting reading. can be purchased separately if damaged. Allen wrenches, ball-joints, clevises, The wings, control surfaces, and nyrods, threaded rod, and many other stabilizer are all molded of expandable small items too numerous to mention polystyrene known as Byro-Foam. Here, are also included. The kit is as complete as in the glass fuselage and installed as it can be. drive system, much of the work has As I mentioned, mine also came with already been done for you, compared to the optional glass kit, which includes an all-balsa kit. The control surfaces enough two-ounce cloth and epoxy to follow full size practice in having the gap cover the entire wing and flying sur­ covered by 1/32 plywood, and are faces. The epoxy is quite similar to the hinged accordingly behind their leading type used in full-size composite aircraft edge. The ailerons are also static bal­ construction, and is excellent, with anced to prevent flutter. about a forty-five minute pot life, de­ Most of the optional retract gear com­ pending upon temperature. A squeegee The moment of truth! After two engine cuts ponents are of molded glass-filled because of fuel and ignition, flight number is provided for application, as are special three was a total success! nylon, which I am told, has nearly the instructions for working with the glass. strength of aluminum. The system is air Before we talk about the construction, edge of building kits of this caliber." operated and has a sequential valve I must bring up a point about the Well,you had best believe what they say, mechanism which operates the gear and instructions as provided. At the begin­ because the instructions are remarkable clam doors in the right order as per full ning of the instruction manual the only in their brevity. Many, many small scale. There is an extra valve outlet for a manufacturer states that, "The building items are either briefly covered or not retractable tailwheel, but the one sup­ of this model follows the procedures covered at all, and some of the building plied in the kit is fixed. Many of the used in most fiberglass/foam kits, and sequences are, I feel, in the wrong fittings are the same as those used by assumes that the modeler has the knowl- order. Excellent sketches and isometric Sonic Systems. The gear legs incorporate dual rate springs with working scissors, and the tires appear to be foam-filled neoprene. Wheels are two-piece affairs of glass/nylon, as are the gear legs. The plastic air tank (which looks for all the world like an empty quart bottle of "Old Ripple") must be mounted in the fuse­ lage along with the valve mechanism and retract servo. Disconnect fittings are used to hook up lines from sequence valve block to the clam door cylinder and gear cylinders on the wing. The gear incorporates a pinch bolt to secure it to the pivot axle so that in case of a severe side load the gear will collapse without damage to the wing. When retracted, the gear is held up entirely by air pres­ sure (no up-lock) and lowered by releas­ ing it. Gravity and a return spring insure the gear w ill fall, even when all pressure is lost. An eight-page construction manual, along with six pages of drawings (in two sizes), outline the building sequence. Two huge decal sheets provide the markings for four different versions of It took two hours just to unload the kit boxes! Don’t expect to knock out a finished aircraft the Mustang (more on these later). A in a few weeks, but the results w ill be worth the effort.

JANUARY 1982 15 The complete drive system, including engine; reduction shafts, belts, The Quadra cylinder head is really not that obtrusive. Certainly not and wheels; and the prop. Not light, but proper for the model. as bad as seeing a little toothpick prop, often seen on scale models. drawings are provided, but they can only help so much. This is a big, expen­ sive, sophisticated aircraft, and should have the instructions it deserves. Byron Originals is aware of the problem and has (at the time of this writing) already released some updated instruction supplements regarding such items as retract valve mounting and operation, glassing of the center section of the wing, and tips to prevent gear collapse. However. I feel more work is needed on the instructions, and some photographs showing the retract and radio installa­ tion would definitely be an asset to the low-time builder. It is not the intent of this article to take you on a step-by-step building se­ quence. since that is really the job of the manufacturer, who can do it the best. I would, however, like to go through and cover important items that I liked,didn’t like, or had trouble with, and especially touch on areas where an inexperienced The complete drive system comes installed in the fuselage, as seen here, with the required thrust builder might blindly follow the instruc­ offset. Make sure your radio is compatible with ignition. tions and possibly get himself into trouble. However, on mine,there were two lines, wing is finished and has been bolted to Construction starts with the wing, and one solid, and one a series of dots, which the fuselage, since there are too many modifications must be made to accept was almost, but not quite, superimposed variables in the construction which the retracts. In Step One in the instruc­ on top of one another. The series of dots could affect their length. Although the tion manual, the hollow core foam is the one to follow to insure correct flaps, along with the ailerons, elevators, wings must have the retract openings gear alignment. and rudder are molded to the correct cut into them. This is done following the Regarding Step Five, the cutting of the shape, they still require some sanding to outline on the bottom of each panel. flaps to length should be left until the fit into their recesses properly.

Very realistic pilot is Dave Platt product. Includes thorough instruc* Fiberglass fuselage parts. Front and rear joined over foam collar. tions for painting. Not all of full figure used in this model. Skip has special construction hints for doing this. See text. 16 MODEL BUILDER Landing gear looks and functions realistically. Skip favored steel It's the little details that add to the realism. Doors and gear operate bolts rather than break-away nylon bolts for mounting. See text. in proper sequence. Wing/fuselage joint is good.

Skip did a nice job of fitting landing gear cover panels. We knew he The Byron P-51 looks realistic from any angle, here touching down could do it! He designed MB's popular F-A 61 twin-rotor autogyro. with the big prop idling. Has good control at low speeds.

Step Eighteen refers to the gear doors, adding only about a pound to the recommended. It requires too much but does not tell you that they are weight. In addition, the bottom center heat and will melt the foam! actually an aluminum and 1/32 ply section must be double-glassed out to The instructions suggested applying a laminate. I cut the aluminum portion of the retract openings, since the cut-out second coat of epoxy over the wing after the doors so that they would fit com­ portions remove the glass from where it lightly sanding it, but I felt this was un­ pletely down inside the wheel wells, is most needed for strength. I applied necessary in terms of weight and work, leaving the 1/32 ply to overlap and tit plenty of epoxy to this area to prevent and used K&B primer to fill any low spots into the recess molded into the wheel sanding through the glass when prepar­ left after sanding. Primer was also ap­ well liners. If this is not done, the overall ing for paint. Also, I found applying plied to the Econokote, after scuffing it thickness of the doors will be too great, masking tape along the gear door recess with steel wool, to fill in some of the causing them to stick above the surface on the wheel well liners will permit you bumpiness which always shows through of the wing when retracted. The instruc­ to run a razor blade along the outside on beaded foam covered with any of the tions also say to epoxy the inner gear edge before the epoxy has completely heat films. After the first application of doors in place. O f course this should be set, then lift up the tape and overlapping primer, several large bubbles raised up done after the wing is finished and glass, producing a clean line for the under the Econokote. These were ironed painted. wheel weel doors to fit against. To save back out with a cotton sock over the iron Regarding finish, I elected to glass the weight and time, the flaps, ailerons, and and no problems occurred in further entire wing. This greatly improves the tail surfaces were covered with Econo- applications of paint. strength and ding resistance, while kote. NOTE: Do not use Fabrikote as Continued on page 102

Close fit of molded foam tail surfaces shown here. Skip used Byron Skip in the middle, w ith his helpers on the project, Thurman Bruce glass kit to cover all flying surfaces. Balanced hinging. (left), and Alan Davis, who took the fine cover photo. JANUARY 1982 17 MODEL BUILDmĚ RAVEN By DAVE JONES .. . The latest in a long series of tailless designs by the author, this one features a higher aspect ratio, a different wing section, and 'D' tube costruction in the center section for additional rigidity.

• The M.B. Raven is a competition has a tendency to change during the hovering into the wind. Directional soarerof tailless configuration. It will not heat of battle, causing inconsistent control is accomplished by a vertical tail make you fly better or worse. But, results. The total pitch stability is pro­ similar to a tailled sailplane. The pod, perhaps you can utilize the different vided by the wing section in conjunction center wing including elevator, and the capabilities it provides. The ‘Plank’ con­ with the correct center of gravity. Pitch fin/rudder are one unit, allowing a figuration relies on simplicity to provide inertia is very low because of the lack of permanent hook-up of the controls. a reliable soaring machine. Sweep and an aft body and a tail some distance This type of sailplane can be built light twist are not necessary for stability. Twist behind. Inertia values are determined without extra effort. Your local flying by the weight of an item times its conditions can be matched by building distance to the center of gravity squared the model light or heavy. A satisfactory (wd2). This means that a 10% decrease in range of wing loadings is from 4 to 8 arm results in a 19% decrease in inertia ounces per square foot. The only notice­ for an item. Consequently, a small able difference is in flight, stall and control surface provides sufficient landing speed. As you might expect, the power for maneuvering in pitch. The heavier loadings provide better pene­ prototype has a throw of 17.5 degrees of tration. Consistent with a tailled airplane, up elevator. This is more than adequate down elevator is not as effective as for thermal flying. A full 40 degrees of up ballast. As shown, this model should can be used for special stunts such as come in with weights of 6 ounces for GEOMETRIC DATA Item Wing Tail Area-square feet 9.51 0.75 Aspect Ratio 8.84 1.33 Taper Ratio 0.61 0.39 Leading edge sweep-degrees 10.06 33.69 Wing Section CJ-3309 Flat Plate Thickness 9.4% 0.5 in. Span-inches 110.0 12.0 Root chord-inches 14.0 13.0 Tip chord-inches 8.6 5.0 Mean Aerodynamic Chord-inches 12.71 9.59 Designer Dave Jones holds his prototype in Weight-ounces (Prototype) 41.0 right hand and Phil Burton's in his left. Length-inches 34.5 18 MODEL BUILDER each outer panel and 29 ounces for the center and equipment (2 channels). A completely sheeted wing (1/16) should put the loading in the 5-6 ounce range. BACKGROUND This type of model has a long history with me. I built my first ‘Plank’ style fly­ ing wing 32 yeas ago. Later, when I returned from a stint in the Air Force and completed my schooling, I built another small free flight plank. This plane showed some promise, so I doubled its size and later added a radio for slope flying. Since then I have built upwards of twenty different radio control plank designs. The biggest improvement in perfor­ mance came with the development of higher performance wing sections. This led to tne well known Raven design. Since then, several different configu­ rations have been tried. None have shown an overall improvement to the forgiving characteristics of the Raven. M ore than 400 contest flights have been flown by members of the Soaring Union of Los Angeles (SULA) with plank type includes a sheeted ‘D’ tube leading edge successful approach in our club has flying wings. This has been invaluable in to improve the torsional stiffness. The tip been to keep the speed up during land­ improving this type of sailplane. panels are of the turbulator spar type, ing. The wings must be level and not M.B. RAVEN which help to keep the inertia low. This turning when the nose is forced down. It The Model Builder version draws improves the roll/yaw response. can be floated in during no-wind condi­ heavily on the original Raven for its basic The prototype is a little lighter than I tions. configuration and control arrangement. expected, coming in with a loading of Continued on page 100 Known improvements from other 4.3 ounces per square foot. Thermal models have been included. These in­ flights should be satisfactory up to a clude the most obvious higher aspect loading of at least 8 ounces per square ratio, as well as a different wing section. foot. So a lot of room is available for This employs 3.3% camber and 9.4% experimentation as far as structure and thickness combined with essentially a weight carrying is concerned. One thing flat bottom. The wing center section also hasbeen obvious, a lot of dihedral is not needed for these plank configurations. More dihedral than shown will cause the turn to tighten. As little as 4 degrees have been tested with adequate turn control. However, the turn will automatically open unless held. Also, the type of dihedral is not critical. Straight, Raven type, and multiple dihedral have all been tried with no apparent ‘best’ type. The flat center section allows a simple control hook-up. Nothing has to be un­ hooked for disassembly, possibly chang­ ing a trim to your flying detriment. Straight dihedral does give more ground clearance for landing. Flight character­ istics will be essentially equal. DIFFERENT VERSIONS This model has been designed for local conditions, as you might expect. These consist of low winds and light to strong lift. Contest tasks that it must fly include time in excess of its unaided glide time. This requires a model that can go some distance looking for lift or utilize very light lift. This model has both of these characteristics; hopefully in the right ratio. Don't give up at low altitude. This model is very much at home in light, low-level lift. M.B. Raven is stable enough to fly ‘hands-off’ as well as come back from downwind in winds up to 12 mph. This is with the prototype wing loading, but don’t get below 30 degrees above the horizon before starting back. The other requirement for this model is to get those landing points. This requires Toni Lynne Figler gives usa full view of the Wing structure of the prototype Model Buil­ practice with the plane to become famil­ Model Builder Raven in this vertical photo by der Rave. Note slight airfoil upsweep. iar with its characteristics. The most author/designer Dave Jones. JANUARY 1982 19

AUR 1982 JANUARY

KEEP GAP SMALL v f V CU T A F T E R ASSEMBLY - FACE W ITH μ16 PLY ULSZ LN VIAL - E PG 108SEE PAGE - AVAILABLE PLANS SIZE FULL 21 Basic tools needed for the task of straightening rotor shafts as des- Screwdriver points to location where main rotor shafts usually bend, cribed in this month's column. Effective but not fancy. just above last supporting bearing.

• Last month I reviewed crashes and Full size practice dictates jigs for nearly shafts. If the helicopter is ever going to possible causes; this month I’ll give a few everthing, but they can more easily be smooth again after repair, these two tips about how to get that crashed bird justify the cost and necessity of such jigs. shafts had better be straight, not, "it'll be back in the air. The point I'm trying to make is to close enough, I won’t bother to check First, a little philosophy on how to do assume nothing is left straight after a it.” The shafts are not a subtle point. If the job. I said before that when an rollover or crash, and check as much as you are a rich man, the easiest way to airplane tipped over, a new prop and possible before flying again. Once solve this problem would be to just buy a some scuff tape would probably get a crashed, it becomes more difficult to set new shaft. But even new shafts have fixed-wing pilot back in the air. Unfortu­ up a ship so it will run smoothly, and this been known to come bent, so it would nately, it’s not so easy for rotary wing applies mostly to the aluminum side be a good idea to check the new ones, jockeys. When a helicopter tips over, framed, aluminum tail-boomed heli­ too. most everything either bends or breaks, copters. Of course, what I offer here is an and you see the obvious damage . . . but Unfortunately, most of us catch only alternative to buying new shafts every I think a lot remains unseen. You’ve the major pieces bent in a crash, and time you crash. With a little time and probably read in the car columns about some of you probably don’t even check patience you can do a remarkably good "tweak boards”, and if I understand the major parts the way you should. I job of straightening shafts with a mini­ correctly, they are perfectly flat, used to feel that checking those major pieces is mum of tools and machinery. adjust car chassis, either perfectly level, part of your responsibility as a helicopter First, you’ll need bearings to support or “ tweaked” one way or another. The pilot. It is more excusable to miss the the shaft. Since the main shaft must be same idea would not hurt in the realign­ subtle points, because most of us don’t removed from the helicopter, the same ment of helicopter side frames; for have the means, time, or equipment bearings used in the chopper can easily instance, particularly if you have a necessary to really get it “ right” again. be pulled (in most cases) and utilized. If 'copter with an aluminum framework. The first things that are obviously the bearings are in an awkward spot, The same ideas could be applied to going to be bent (aside from the rotor simply order two extras to have on hand other sub-assemblies of the helicopter. head itself) are the main and tail rotor should the need arise. The bearings are

Tail rotor shafts will bend at this point, where they exit the tail Main shaft bearings clamped in place on sturdy railing. Clamp with rotor transmission. shaft in place, as it makes for easier alignment 22 MODEL BUILDER Initial check of a main rotor shaft. As shaft becomes straighter Close-up of gap between shaft and screwdriver. This was taken near during adjustment, the visible gap gets smaller. the end of the straightening process. It'll get even closer!

held in place with "C ” clamps, as shown square will do for tail rotor shafts. shafts, although it could be done as well. in the photos. It is imperative that the With the main shaft I would advise a As you "play" the shaft, position a bearings be positioned at the same piece of basswood with a “ grip” ce­ screwdriver at one end to observe the points on the shaft during thestraighten- mented to one side along the stick’s run out. The screwdriver should be set ing process as they were mounted in the length. The grip is taken from an old so the shaft touches it for a split second. helicopter. The reason for this is that the bicycle inner tube, where a piece is cut The rest of the time there will be a gap shaft will bend at a spot that depends on 3/8 inch wide by 12 inches long. This is between the screwdriver and shaft. At where it was last supported. In my Jet epoxied or contact cemented to your this instant point of contact between the Ranger, the shaft bends just above the stick. This can then be used to "play” the two, mark a line on the top of the shaft top bearing, but below the swash plate. main shaft back and forth with perfect with a magic marker or other indelible The same goes for the Heli-Boy and most tension kept in the bearings. I have not felt tip pen. This precisely locates the other designs. Likewise, the tail rotor found this grip necessary for tail rotor Continued on page 91 shaft will bend just as it leaves the gearbox (see photos). If the shaft is not held in the exact location as it is in the ship, it will bind in the bearings and give faulty indications of where the shaft is actually bent. All of this ultimately leads to frustration, so be careful to get it right at the start. Now that the bearings are properly in place with C clamps, insert the shaft and rotate it with your fingers positioned between the two bearings. As you rotate the shaft, try to keep a constant pressure on it since the bearings themselves will have some degree of play. You can take some play from the bearings by carefully putting a little extra pressure on them with the C clamps. With small shafts such as the tail rotor, it is necessary to use a piece of basswood (or similar) to roll the shaft. With the main shaft, use a piece at Correct block and hammer placement for straightening a main rotor shaft. Black mark on shaft least 1/4 inch square, and 1/8 inch to left of hammer indicates "back" of shaft. Text explains it all.

Tail rotor shaft is checked in transmission, less bevel gears. Shaft Block and hammer placement for straightening a tail rotor shaft, rotated for bend checking by rubber-covered stick. Big shaft, big hammer. Small shaft, small hammer. Fairly logical!

JANUARY 1982 23 m 7C-4SF

By CHIP CONKLIN . . . A review of the JR 7C-4SF "SPECTRA SERIES" radio control system, as marketed in the U.S.A. by CIRCUS HOBBIES.

• Since their introduction to the United supplied with the 7C-4SF system. The meter is a relative RF power States by Circus Hobbies a little over two THE TRANSMITTER indicating type, and as a final touch, a years ago, JR Radios have met with rapid The transmitter is housed in an attrac­ sturdy metal boss is provided for the and widespread acceptance by Ameri­ tive 5-1/2 X 6-3/4 X 2-1/2 inch case which attachment of a neck strap. can modelers. This is evidenced by the is fabricated from molded plastic sides The gimbals are mostly plastic with fact that out of 42 Masters fliers at the and very thick (.075") extruded and metal sticks. The length of the sticks may U.S. Team selection contest this year, stamped aluminum for the top, bottom, be adjusted by loosening a set screw in nine were using JR radios and four of front and back. The transmitter weighs the end. This requires the use of a metric these were in the top 10 finishers. 2-1/4 lbs., which is about the same as alien wrench which is not included with The subject of this review is the most conventional metal cased designs. the radio. An interesting feature of the Spectra Series 7C-4SF system. This con­ It is well endowed with bells and whis­ gimbals is that they may be rotated so sists of the Model 127F transmitter which tles, which include dual rate elevator the stick travel follows the natural has the elevator/flap mixing and spoiler and aileron switches, an "Elevator/Flap” movement of your thumb. This is the features, the NER 227 receiver, four NES switch, a “ Spoiler 2-1” switch, retracts, sort of thing that most of us would never 101 servos, and a 500 mah battery pack. and an "Aux I” position knob. I’ll get think about. It turns out that if you move The accessory and hardware package into the operation of the special func­ your thumbs as if operating the sticks includes the switch harness, a charger, tion controls later. but without touching them, you will find three different servo trays with com­ The power switch is a locking toggle the natural travel is actually about 15° plete hardware kits, and a frequency switch which must be pulled up before out of the horizontal. After adjusting the flag. switching on or off, thus preventing stick travel, I found at first that, out of In addition we'll take a look at the accidental operation. In addition, there habit, I would tend to move the sticks NEA-500 Reverse Amplifier. This is not is a red LED power indicator light. horizontally (leading me to believe that

J R transmitter features rotatable stick gimbals, blending to normal The J R transmitter, looking through the back door. A ll metal case human thumb movement. On-Off switch toggle self-locking. parts are hardwired to ground. Knobs and switches explained in text. 24 MODEL BUILDER Receiver is 7-channel plus direct servo controller, allows system opera­ Inside receiver. Connector pins soldered to circuit board. All RF tion without xmitter. Double-tuned input and tuned RF amplifier. coils and transformers on board shielded by metal cans. this would be a great feature for be­ Typical servo travel in high rate was error was 2 usee (micro-seconds), which ginners only) but actually it took very about 35° in each direction, with a is equivalent to 0.2° of servotravel. All of little time before I was following the new maximum difference between right this error was hysteresis, i.e., as long as stick movement without thinking about and left travel of 2°. On low rate, a the stick was moved in the same direc­ it. screwdriver adjustment on the back of tion, it returned to the same center, but All of the trims are electronic and are the transmitter provides for setting the if the travel direction was alternated, it rovided with a detent action which travel anywhere between 9 and 32 didn’t return to exactly the same center. elps to prevent accidental movement. I degrees. Neither switching between It should be noted that this is all aca­ found each detent to provide about 0.5° high and low rate nor adjusting the demic, as this amount of error is less than of servo travel. It is interesting to note travel had any effect on centering. The the servo can resolve. The transmitter that although there are reference marks only objections I had to the gimbals draws about 150 mA from its 500 mAH on the transmitter case, there is no mark were that the tab adjustments required a battery pack at full charge, which should to line up with them on the trim levers. fair amount of force to pull out, which provide for a little over three hours of Another interesting innovation on may make it difficult (without some continuous operation. this transmitter is the provision of practice) to adjust them without dis­ I measured the output power of this adjustable trim tabs. This allows you to turbing the trims. I also noted that the transmitter at 360 mW which,althougha set your trims as needed and then, by force required to operate the rudder bit on the low side for my taste, is pulling out on the tab, you can center it stick was perceptibly greater than the entirely adequate. I checked the system mechanically without affecting the elevator or aileron sticks. operation vs. battery voltage, and found electrical setting. The resolution of the The inside of the transmitter is neatly that the transmitter functioned normally tab centering detents is equivalent to constructed with the electronics con­ with no perceptible servo centering about 0.75° of servo travel. One of the tained on two circuit boards. A good change, with a battery voltage variation reasons for this trim system is that the example of the attention to detail in this from 6.5 volts to over 12 volts (I d id n ’t go servos have no means for electrical transmitter is that all of the metal case higher than 12 volts for fear of damaging centering. The tab adjustment lets you parts are hardwired to ground instead of the electronics). The transmitter worked get exact centering on the servos using relying on the contact of the parts with all the way down to 4 volts . . . which the transmitter trim, and then allows you each other to provide the connection. means you could lose half the cells in to recenter the tabs to preserve the Attention to things like this go a long your transmitter pack and still have normal full trim range. I found the way towards enhancing the long-term enough control to get your plane down normal trim function will provide 10 to reliability of the system. safely if it was still within range. 11 degrees of servo travel, with an Electrically, the transmitter operates In addition to the retract and dual rate additional three degrees right and five around a 1.5 msec (milli-second) pulse switches on the transmitter top, there degrees left travel available by operating width with a ±0.5 msec variation with full are two other switches and a knob. The the tab adjustments to the extremes. stick and trim travel. Stick centering Continued on page 73

Reversing amplifier, available separately. Plugs in between receiver NES 101 servo has ball-bearing supported output shaft, sealed carbon and any servo that must have its operation direction reversed. pot, carbon button pot wipers. O-rings to seal out w eather.

JANUARY 1982 25 "Hello, Tower: We have this slight problem with our right aileron." Bob Deadmond's C-47. being flown by Randy Lyman, makes a successful emergency landing during the Greater St. Louis Modeling Association Air Show.

were approached in a more relaxed acorns beneath our oak in the front yard fashion. While I still worked to be com­ signal another season change. It always petitive, my super pit crew, Cathy, seems like it will be such a long time noticed a less intense Dad. I so very from April to October, but it never is. much enjoyed the fantastic atmosphere The leaping days become scrambling that seemed to be present. This was weeks and fleeting months and the long beautifully capped by the excellent Nats hours spent the winter before, ponder­ experience and finally the Scale Masters Dave Bunch and his O.S. Max 60 four-cycle powered Smith Miniplane at McDonnell ing the glories of the contest season, at Louisville. Maybe it’s old age and Douglas St. Louis contest. seem to be almost in vain some years. senility creeping in, but my oh my. what Not so for 1981. I suspect that the a super modeling year. I hope yours was cerning the pop rivets and screws on the contentment for this season was due at as well. H ipe rb ipe . The same question was least in part to a reasonable degree of RIVETS AND SCREWS posed at our Modeling Association air success, but more realistically I think At the Scale Masters, I had a number show. Basically, they wanted to know that it was because the "contest wars” of persons ask the same question con­ how they were made. In a past column, this subject was covered, but we’ll shoot at it one more time to catch newcomers, former non-readers, and other sundry souls. There are some 5-600 of the little beggars on the Hiperbipe. The pop rivets are the common type that you’ve seen many times, looking like half a doughnut resting on the metal skins. Since there seems to be little if anything made to fill the need, I cast about trying to find something to use. I even tried some very small sequins, but strangely enough, when I got finished, they looked like very small sequins rather than rivets. My next door neighbor (not a mod­ eler) suggested that I punch them out of thin aluminum, punching a small hole in them with a centerpunch and gluing them on. That didn’t work very well "Say aah!" Don Allen pumps up the retract system on his A-4, during the GSLMA Air Show. either. We then brainstormed some All Air Show photos by T. Walker. other materials that might work, so I 26 MODEL BUILDER PHOTO BY FRANK TIANO

Bob Deadmond cranks on his Fleet Trainer prop as Bob Erxleben Scalemasters winners. Sport Scale (I to r): Bob Frye 4th, Bob Under­ stands by with transmitter. GSLMA Air Show. wood 2nd, Tom Cook 1st, Kent Walters 3rd, and Cliff Tacie 5th. tried a great variety, which ultimately smaller in diameter than the average T- a small X from the screwdriver. You will included the plastic sold by Sig as Aero- pins which are sold for modeling pur­ probably have to practice to achieve the plastic. I used the very thinnest sheet, poses. With all of the holes drilled I now proper pressure as well as playing a bit to which is listed as .010. don my extra eyes (magnifying lenses) achieve the correct head quality. If the Now armed with the material to use, I and, using a pin, pick up the little guys by screws on the full scale were not painted set about getting the right size tool and a stabbing them ever so lightly exactly in and were natural metal, you can rough means of making them that didn’t take the center. A very small dot of RC 56 glue up the plastic and spray it silver (or what­ an hour a shot. When the proper size was placed in the concave back portion. ever) before you punch them out. There was arrived at, I selected a drill to match The plastic disc is centered over the hole is no need to drill any holes for these. the size and drilled a hole all the way and the pin is pushed through the plastic Unfortunately, you can only make one through a small metal block. At right into the hole, collapsing the center in a of these at a time. angles to the drilled hole, a slot was cut very realistic fashion for a pop rivet. I’m certain that all of this seems into the block. The end of the drill was Using your fingernail or a small screw­ terribly time consuming. It is. The results rounded slightly to create a domed driver, hold the plastic in place while are really quite good and they add effect. you remove the pin. Eureka, now you virtually no weight to speak of. The plastic was inserted into the slot have a pop rivet! Repeat four or five SOME OBSERVATIONS and the drill into the hole. A light tap will hundred times. I would suggest that this The greater St. Louis M odeling Associ­ punch out a small domed circle of process be done after most or all of the ation has held an annual Air Show for plastic. About 8-10 of these little babies p ainting has been done to prevent the last nine years. This is not a highly can be stacked in the hole and pushed buildup of paint that will spoil the effect. polished, professional type of presenta­ out at once. Naturally, when they hit the The Phillips head screws are made in tion, but is designed to let thepublicsee work surface they act just like a dropped the same fashion, with one or two addi­ flying models and allow the guys a slice of bread with peanut butter and tional steps. Select a small Phillips head chance to show off a bit. This year we jelly on it, they land upside down. Using screwdriver and grind or turn it down to had a large number of the modelers, a straight pin, they can be flipped over, fit the hole in the metal block. You will lovingly referred to as Sunday flyers, as domed side up. Be careful not to sneeze probably have to rework the end since part of the four-hour show. Everyone or you'll have a whole workshop full of most of the blades tend to be too sharply did a very nice job, and the resulting little white dots. pointed. Run the screwdriver up through monies collected brought our contribu­ All of the holes for the location of the the hole from the bottom. Be certain tions to the Missouri Park Board Scholar­ rivets were predrilled. You'll have to that it does not reach the slot. Place the ship Fund to over $6000. These monies experiment some, since a rather small plastic in the slot and punch out the discs are used for scholarships to persons numbered drill is required. The hole was as before. You will imprint the disc with Continued on page 94

Paul Trendley, S«. Charles, with his 19 pound Byron Pitts. Super Don Allen's A-4 making a smooth approach during the GSLMA Poxy finish. Not flown at time of photo by T. Walker. Air Show, with John Britt at the controls.

JANUARY 1982 27 doesn't have a hot glow element for ignition. Instead, a contra-piston is used to increase compression and fuel/air temperature for spontaneous ignition, and then the compression ratio is de­ creased as the engine temperature in­ creases. Naturally, there are other vari­ ables and devices,but thisverysimplified r . v . συκ explanation should improve our under­ Lieu η. Hill*, CA 92653 standing. Enough of that. What can we do to improve cold weather starting? Here are THE NEW YEAR 3. Will a few suggestions. Hooray! The January 1982 edition! A. Turn off transmitter. 1. Begin in the warmth of your home. There’s just something great about a B. Light D/T. If your engine hasn’t been run recently, new year! Wait a minute. As you read, C. Pull Test. the lubricant has probably congealed, it’s not yet '82. It's still early December of 4. Will not kibitz buddy (or club and turning the prop will give you the ’81. This is part of the mystery of maga­ klutz). feel of molasses. Use some WD-40, and zine publishing . . . at least monthly 5. Will practice. juice down the engine until it’s free and ones. They're always nominally a month 6. Will not crash. easy. early. Not only model magazines, but all If you have some of your own about 2. Check the condition of the glow monthly publications that come to the foibles of modeling that readers plug, and be sure it’s not a cold type. If mind. I don’t know why, and no one has might enjoy, send them to me. For there’s any doubt at all, install a new ever been able to satisfactorily explain it everyone’s list that’s published I’ll send a one. You might want to refer to this to me. I have a deep suspicion it’s a small merchandise gift. column in the June 1980 issue for more nefarious plot to convey a sense of effi­ ENGINE POTPOURRI information on glow plug selection. ciency. Unfortunately, that doesn’t hold The winter months are here, and even 3. If you have a nylon prop installed, much water. Especially when you see a in Southern California it sometimes gets replace it with a wooden one. Nylon new edition on the newsstand a week a little chilly. As many of you so well becomes brittle and will crack or shatter before you receive your prepaid sub­ know, there are other parts of the easily in cold weather. scription. To buttress the argument, just country where it’s damned cold. Despite 4. Check your starting battery. Re­ consider that you usually receive your the adversities of cold and snow, intrepid member, cold weather is rough on all weekly subscription to Time, Newsweek modelers still persist in flying. Those battery performance. How about a glow etc. a day before, or simultaneously who do are unquestionably dedicated to driver for the Christmas wish list? with, appearance at newsstands. What their hobby. Either that or they’re not 5. Flush and check your fuel tank and can we do about it? As a practical matter, dealing from a full deck. Seriously, cold filter. It might also be a good time to probably nothing. We’re victims of the weather engine operation does present replace aged fuel lines. inertia of a system that’s been en­ some problems, but they can be over­ 6. Clean the carburetor. trenched for many years. So, I’ll get off come by using a few simple techniques 7. Carefully check the completeness the soap box, and get back to regaling and adequate preparation. of your flight box. the holiday season. (You can’t fight city First, a bit of background so that we all OK, you're well prepared, and headed hall! When MB first came out, we dated can understand why there are problems for the flying site. It’s comfortable it the same month it was published, and in starting automobiles as well as model driving in a warm car in winter. Isn’t it? were accused of being a month late! engines. There are two basic reasons; It’s also comfortable for your model wen) relatively poor fuel vaporization in the engine. When you arrive at the site; Guys, Christmas is a fine occasion to carburetor, and a compressed fuel/air 1. Keepthedoorsandwindowsclosed increase your inventory of model mer­ mixture temperature that is not quite when you get out to greet the other nuts chandise ... if you go about it the right hot enough for smooth burning. Both of who came to fly. Your model engine will way. Don’t get me wrong. There’s abso­ these, of course, are due to the low stay warm for quite a while inside the lutely nothing underhanded about that temperature of the air before it enters car. (It's not in the trunk, right? wen) inference. Just be practical. For most of the engine. Consider an outside air 2. When you decide to fly, prepare us, Christmas is just not an ideal time to temperature of 70 degrees Fahrenheit. everything you can in the warmth of the ask Santa for a new eight-channel-with- With a compression ratio of seven-to- car. Station wagons are great for this. everything. R/C set. Too expensive at a one, when the piston has fully com­ Tailgate parties too. Put one on your very expensive time of year. Think of pressed the fuel/air mixture, theoreti­ wife's Christmas list. something that won’t bust the budget cally the temperature would be 490 3. Take your flight box and other . . . like a new engine. Sooner or later degrees. Remember, temperature and paraphernalia to the flight line. you knew we’d get to the theme of this pressure are proportional. Thus, if the 4. When you’re ready to start, then column! With very little thought, a new outside air were 40 degrees, the com­ bring out the plane ... with an old, but engine makes good sense. A sound pressed temperature would only be 280 warm towel wrappedaround theengine. investment. Nobody ever has too many degrees. That’s not really ideal for ready 5. Start your engine, let it warm of them. Besides, it opens up a whole ignition and smooth burning. thoroughly, tweek the carburetor as new world for stocking stuffers such as A quick solution might seem to be to necessary, and have a good flight. glow plugs, props, filters and what have increase the compression ratio. Theo­ But, suppose the engine won’t start. If you. Just use your im agination, and retically, yes. Practically, no. Consider an it's really cold, starting can be a real bear. some subtle hints. automobile engine in cold weather. It’s If you use an electric starter, it’s also easy RESOLUTIONS balky to start, but once it's running and to flood an engine. In that case, remove Consciously or not, most people make warms up, everything’s fine. That's the glow plug, disconnect the fuel line at them at the beginning of each year. simply because the heat of the engine the carburetor, and crank theenginefor Here are some for your consideration. warms the fuel and air in the carburetor about ten seconds with the starter. That They were developed at a recent mod­ and manifolds before compression. will clear the flooded condition. Install a eler's tailgate party. The same thing happens in our model new plug, reconnect the fuel line and 1. Will read instructions. engines. And so, if we increase the com­ prime the engine throughout the ex­ 2. Will not cuss when pression ratio for an easier start, it will be haust with a special cold weather primer. A. Building. too much once the engine has reached What’s that? Just a mixtureof equal parts B. Starting engines. operating temperature. The exception C. Crashing. to all this is the model diesel engine. It Continued on page 78 28 MODEL BUILDER One glance at the tail section of this aircraft and the manufacturer is identified. The X02D-1, the last Douglas biplane, reflects the DC-2 design in its construction and shape of the aft monocoque fuselage and tail surfaces. (Photo from McDonnell Douglas via Harry Gann.) DOUGLAS X02D-1 • Looking back at the early thirties, it’s By NICK KARSTENS its sea legs were checked out on the hard to believe that a scout-observation SOC-1 Seagull. In the late thirties the ocean off of Santa Monica. A 550 HP biplane designed in 1933 would even­ Curtiss S02C Seamews were built as Pratt & Whitney R-1340-12 Wasp engine tually be used through World War II. replacements for the SOC’s, but even turned the 9-foot diameter all-metal The U.S. Navy issued contracts in 1932 though they were monoplanes, they had round-adjustable pitch propeller. The for single-float amphibian scout-obser­ a somewhat unsatisfactory operational asic fuselage was the tried and true vation biplanes to three aircraft com­ career and were withdrawn from service welded steel tube frame with fairbows panies: Douglas for the X02D-1, Vought in 1944. The rem aining SOC’s were to round out the shape and stringers for the X05U-1, and Curtiss for the restored to operational condition and running fore and aft over which was X03C-1. Although this article empha­ were used until the end of World W arll. stretched the fabric covering. A semi- sizes the Douglas X02D-1, it was the The Douglas X02D-1 was completed monocoque all aluminum structure Curtiss X03C-1 that won the competi­ and first flew in April 1934 from Santa made up the last 91 inches, carrying the tion and went into production as the Monica airport. On subsequent flights Continued on page 110

Rectangular directional loop is formed by sets of five wires built spanwise in right wing structures and connected at inner and outer ends by five vertical wires. Final elevator trim tabs were half the span shown here. (Photo from McDonnell Douglas via Harry Gann.) JANUARY 1982 29 30 MODEL BUILDER JANUARY 1982 31 the Electronics Comer By ELOY MAREZ

• Since this is only the second month for MB’s new electronics column, as the first one is only now being typeset or at some other stage of the production process, we have not yet started to receive any written input from the multitude out there in R/C land. So, we are going to have to run for a couple of months on subjects which have recently come up in conversations at the local flying fields. One way to stir up some interest would be to start an argum ent. . . wanna talk about the downwind turn? How about scale speed? Well, not quite as controversial, but still open to opinion, and more in keeping with the intent of this column is: “ Which is better. Mode One, or Mode Two” ? For those of you who are still contem­ plating the purchase of your first system, modes in this case refers to the control If you're going to tinker w ith electrons, you should have a place to do so. The author's elec­ stick versusflight control relationshipon tronics workbench, that generally looks more worked on. Neater than MB editor's! four, or more, channel, two-stick trans­ mitters. By far the most common is Mode Two, felt I was really flying, and that there was given to the right hand. I can'tseethat as on which the left stick controls the hope that I might yet master a take-off, being an important point either, as throttle in the vertical and rudder in the flight, and landing, all at one time, and everywhere you look, you see right horizontal plane; and the right hand still have a flyable airplane. handed people doing two handed stick controls the elevator in vertical, Now. in all of these years of flying, I chores with a great amount of accuracy. and aileron on horizontal motions. have never heard what I considerto bea Right this moment, I am flying this type­ In the Mode One configuration, the valid reason to fly Mode Two (that ought writer at 120 WPM (would you believe left stick is used for elevator and rudder; to get some letters.. .). (and M D ’s Editor 15?), my left hand shares at least fifty the right one for throttle and aileron is really biting his lip! wenj The oft heard percent of the work; we also drive, run movements. Note carefully that the point that it is more like flying a real air­ lathes and mills, eat, and do countless control of the rudder and ailerons plane does not seem too valid to me, as I other things with two hands . . . what remain the same, the only difference is a see little similarity between flying a high hand do you adjust the needle valve transposition of the elevator and throttle performance R/C airplane, and flying a with? And don’t tell me that that is not a controls. machine in which you are sitting; which critical adjustment! At this point. I was going to state that I always moves in the direction in which This business of putting the two most have been flying since pre-proportional you are facing; which faces the horizon; used controls on the same stick even days, but that is not completely true. and which lets you know in a very aware appears to me to be a decided disadvan­ However, it is true to say that I tried, part of your anatomy how you sit in tage. Quite often, during flight, you though I never actually mastered or felt relation to the world. Another reason need to simultaneously apply pitch and that I was in charge of things with either usually given by Mode Two’ers is that roll, such as when you do your climbing a single-channel or reed system. It was most people are right handed, and that turn out after take-off, requiring both a not until the first time that I flew a the task of controlling the two most bit of up elevator, and some aileron. Pick friend's plane with an Orbit 7-14 that I critical axes, pitch and roll, should be up your transmitter, and using only the side of your finger against the side of the stick, push the stick into a corner. Didn’t get there smoothly, did it? No .. . most gimbals are not that good, they don’t corner well at all, but go there in aseries of mixed steps somewhat resembling a staircase. Well, those are exactly the signals that your airplane received, and ELEV. reacted to. With Mode One, any simul­ taneous combination of aileron and elevator can be done smoothly, and with no interaction at all. Even if you have a super set of gimbals, capable of cornering well, this method of flying still offers another disadvantage, that of having to maintain the degree of one control input, and not to upset it while moving the stick in the opposite plane. To put it another way, to do a turn, you Basic Mode 1 and Mode 2 transmitter stick arrangements. Rudder servo is normally plugged have to hold a certain amount of aileron, into aileron output when Mode 2 is used w ith rudder/elevator type models. and then feed in some elevator without 32 MODEL BUILDER changing the amount of aileron input. Try it on the ground, and see how often you can do it without also making the aileron move. You will probably say that you don’t feed in zig-zag controls, or that they cancel each other out, or something . . . just look at it, you d o n 't see your ORIGINAL BATTERY TO SERVO WIRING airplane weaving through the sky! Well, that is the point, you don’t see it, in the same manner that we don’t see them skidding through an uncoordinated aileron turn sans rudder. These things happen too fast, the planes are too small, and there is no solid stable horizon or background for you to see these zig-zigs and skids against. If you were in it, you would sure be aware of the movements. It wasn’t until the Wuarter Scale move­ ment got going that a real need for co­ ordinated turns was felt, with a touch of rudder as you apply the ailerons. The phenomena was always there, it is just that when the planes get larger, you can see them skid. not simply that I learned to fly first with many Europeans who fly with a throttle Another point for Mode One. Take a reeds, quite the contrary, as stated hook-up backwards to ours, with high close look around next time you are out earlier. It just seems so much more throttle being a full back position of the at the field and watch your Mode Two practical, and though we are definitely stick. And now and then we run into flier friends. Except for the very expert, in the minority here is the U.S., if you will someone who holds the transmitter you will find that most of them are not check the modes in use at such events as perfectly vertical, and insists that it is flying true proportional, that is, they are the Pattern Internals, and the Tourna­ very natural to push the elevator stick up not mixing the two inputs when a certain ment of Champions, you will find that to make the airplane go up. Seems maneuver requires it. Instead of a simul­ the highest percentage of that caliber of logical, doesn't it? taneous left and up for that climbing flier flies Mode One. In racing, which is If you are a safe competent flyer, and turn we talked about, they are often one of the most demanding types of fly automatically, without having to pulsing thestick left to bank theairplane, flying, both the current and the past fast think out each movement, whichever and then pulsing it up for climb. They time record holders are Mode One’ers. mode you fly is the best one for you. If are not really using the precise control In fact, I know a number of racers who you are new to the game, or if you have available from their R/C system, nor the have changed with the results being been at it for some time without having capability of their model. consistently faster times, (for the record: reached the point of smooth (to the eye) Now, the Mode One flyer has com­ On the U.S. R/C Aerobatic team, Dave and consistent automatic flight, think plete and independent control of the Brown flies Mode Two, Mark Radcliff about it, maybe you need to try my two primary flight controls, without flies single stick, and Steve Helms flies favorite Mode. either the mechanical limitations of the Mode One. wen) SEPARATE SERVO BATTERY PACK gimbal, or his own inability to hold the What’s best is really somewhat per­ Heard from a fellow flyer in the near­ stick perfectly stable in one plane and to sonal, depending on your particular by town of Chino, one Robert Braun. move it in the opposite one. motor skills. As stated earlier, Mode Two Bob is scratch building a couple of inter­ There is one reason, and one reason is by far the most popular mode in this esting projects, a couple of Vari-Eze’s; only that I could ever see for a new­ country, but that doesn’t necessarily one in twelve inches to the foot, and the comer to fly Mode Two, and that is make it best, if you consider the world other one in one quarter inch to the because that is the predominant way in this country, and the chances are that your instructor will fly that way. You really shouldn’t ask someone to train you in a manner in which he is not profi­ cient, besides, he may not always be able to save your model when you get in trouble, so you should go along with his method. Well, you never get something for nothing, and in this case, the point that might be a disadvantage to Mode One is that since the throttle is on the same stick, the aileron stick is usually off center vertically, i.e., when you are at full throttle, it is all the way forward, while the reverse is true at low throttle. It doesn’t seem to matter much to Mode One fliers . . . the adjustment is easily made and one never thinks about it. Quite possibly though, if you hold the sticks with the finger tips, instead of con­ trolling them with the thumb on top, this might be a little awkward. To get back to the basic question, which is best? Obviously, from the com­ ments, I am a Mode One flier, and it is JANUARY 1982 33 Terry Allen and his Toad. There's something to be learned from sailboat keels when it comes to Our intrepid soarer/sailer/author with Terry glider wing design. Believe it or not! Allen's 10-rater.

r/ c SOARING SAILING by Dr. LARRY FOGEL PHOTOS BY AUTHOR

• Last May I focused on R/C sailing . . . of the story. tacking into the wind or running with and I still believe it’s worthwhile to Some designers simply know what the wind.” compare sailboats to sailplanes in terms "good performance" looks like. Others And. so it goes. He has a rationale for of design, construction and operating produce more radical designs by follow ­ each aspect. The Toad emerged from his technique. For example, a new keel ing a basic premise to its logical conclu­ understanding of how the many factors construction laminate may have impor­ sion. Terry Allen, of the San Diego interact to produce the proper hull tant implications for the structure of R/C Argonauts, is of the former school. This shape . .. and, of course, the sails that sailplane wings, but that's getting ahead quiet, unassuming 22-year-old has de­ drive it. It’s now twoyearssincetheToad signed a number of prize-winning R/C left the drawing board, and there are sailboats . . . and his design career is only about 110 of these afloat. I’d say it's beginning. His Toad won the National about time for Terry to come up with a Championship last year. His 10-Rater new and even better design. came in second in the Canadian Na­ In contrast, Karl Kirkman of Laurel, tional Championship. In general, you Maryland, came up with more radical can expect to find Terry's boat in a lead designs for obtaining ultra performance. position. As a matter of fact, I very much Continued on page 70 enjoy my own Toad and Terry’s 10-Rater design. These boats are beauties. They look right, and they perform accord­ ingly. How does Terry come up with such fine designs? "H ull design is an evolu­ tionary process. There’s no perfect shape. I merely trade-off individual features to come closer and closer to best performance under the expected sailing conditions. “ The Toad has a long geneology. In the 1920’s, the Marblehead 50/800 open class was vane-guided. Radio control replaced the vane in about 1968. Each year the design changes to achieve greater performance. In particular, the Toad grew out of Doug Peterson’s P-50, with less freeboard and beam in the stern. The lower the deck, the less the weight and drag. What if some water spills over the deck in a sharp turn? The The Toad under sail at Mission Bay Model beam primarily affects cross wind per­ The 10-rater at Mission Bay. We'd be tempted Yacht Basin, San Diego. formance, but most of the time you're to soften up on the sails, for less heel. 34 MODEL BUILDER Then there's a mighty SNAP, and one large tension buckle forms as a diagonal.

nH* of constn ic tin * *or measuring the distortion of keel samples built with different meth-

Then there's a ripping noise, and the shear web fails in tension!

Desired grain direction from corners '2' and '2'. For inverted flight, grain should be from Laying fibers on keel in diagonal pattern adds twist resistance to the final product. Same meth­ corners Ί ' to "Γ. od can be applied to the construction of foam/'glass cloth glider wings.

JANUARY 1982 35 SUPER "G"SHARK ftaturinc directional control Patadtad VICTOR STANZEL a CO.

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The Super "G " Shark was one of many similar designs to come from the Victor Stanzel & Co. headquarters in Schulenburg, Texas, starting with the single-line Tiger Shark. The smooth streamlining and fin faired into the cockpit headrest are a trademark of this famous line.

36 FULL SIZE PLANS AVAILABLE - SEE PAGE 108 MODEL BUILDER 1. "Pierre Flabon" nee Tom Brennan, the ori­ 2. High Time man of the day. Gene Gordon, 5. Ron Keil, SAM 27 Proxy, holds the "Merd ginator of the SAM 27/Marin A.C. Pacific Ace of the Marin Aero Club. Hopper" Award. Note proper reverence by challenge. doffed hat.

turns did he say he was using?” ‘‘Are we going to use the long motor on the first flight?” “ Do you want the plastic prop or the balsa prop?” “ I wish I had time for one test flight,” and not least but last, “ I forgot the Pirelli!" m e spam s A pilots' meeting was held by Pierre Flapbon, C.I.C. of the Marin Aero Club By JOHN POND F.A.F., to explain the rules for the ' \ competition and to take team photo­ graphs. Following the meeting at 10 a.m., • As promised an issue or two back, we Air Force). Lined up on the busy tarmac competition started at 10:15 a.m. are pleased to present a report on the were two rows o f Pacific Ace 30 models, ROUND 1: Weather during this time SAM 27/MAC Challenge meet as re­ seven from the M.A.C. and five from the was windy and overcast, with little ported by Tom Brennan, 588 Cedar- visiting SAM 27 Squadron. All 12 of the thermal activity. Amidst the whirring of berry Lane, San Rafael, CA 94903. aircraft were being carefully prepared busy winders, Paul Stober (MAC) was As can be seen in Photo No. 1, Tom for competition in the MAC/SAM 27 first o ff with a flight of 51 seconds. Eric Brennan, who goes by the psuedonym Pacific Ace Challenge to determine who Halberstadl (MAC) also registered the of “ Pierre Flapbon” , is displaying one of would be the recipient of the famed same time. Using his "lightweight" the Pacific Ace models that competed in "Merd Hopper Award”. (Actually, the version o f the “ Pac-Ace” , Ron Keil (SAM this most amusing event. As a matter of losers get the award as merd is French 27) posted a time of 37 seconds. Gene fact, we are quoting practically verbatim for B.S.) Gordon (MAC)and Tom Brennan (MAC) from his hilarious contest report. Feverish activity and soft nervous launched at the same time and came in On August 23, 1981, the dawn broke conversations between the participants with times of 1:34 and 1:11. Ed Solen- cool, grey, and windy over the Black and their crews emphasized the impor­ berger, late in arriving, finally launched lohn Slough Aerodrome, home of the tance of this competition. Comments before the first round deadline fora 1:21 famous Marin Aero Club F.A.F. (Funny that could be heard were: " How many flight. Scoring showed the MAC

a Ron Keil cranks up his Pacific Ace. Larry Gomez holding. 4. Winnahs and losahs! (I to r) Solenberger (SAM 27), Stober (MAC), Gordon (MAC), Makinson (MAC), and Keil (SAM 27).

JANUARY 1982 37 7. This photo of Joe Ott's compressed air powered biplane model 8. Remember Bud Warren of Tom Thumb engines? Here's his latest was actually taken in 1931! creation, a Bunch S corpion. See te x t.

Squadron ahead of SAM 27 by 3:03 to 2:47. ROUND 2: Alas, the vicissitudes of competition eliminated three of the Aces for this round: Halberstadt (MAC), Drier (MAC) and Buchanan (SAM 27). This round featured wind varying from calm to strong gusts with abundant thermal activity; hence, only nine air­ worthy Aces reported for this round. Noted at this time was the SAM 27 team efforts to reconsider meteorologi­ cal conditions by using Nick Sanford's huge compressed air bomber to pin­ point thermal activity and wind drift. 6. Wayne County, the 1937 Nationals. Another Black and white beauty by Elbert However, this availed them little as (Joe) Weathers, for the Berryloid Finish Event. Cordon (MAC) started off this round with a resounding 6:47 OOS flight. This model so that the other competitors, session, inform ed Solenberger of the was quickly followed by Makinson notably SAM 27, can take note of what a secret of trim. With only 10 minutes left (MAC) with a 6:49 OOS flight, last seen good (lying Pac-Ace looks like. in the round, Solenberger put up the disappearing into the clouds. Fortunate­ Sanford (SAM 27) recorded the first best SAM time at that time of 1:33. ly, Photo No. 2 was taken of G. Cordon’s SAM flight with a 1:24. To show how it Second round totals found the MAC was done, Brennan immediately team with 19:47 and SAM 27 at 7:05. launched into a gale and went OOS at ROUND 3: The wind was nearly at 3:32. St ober (MAC), not to be outdone, gale strength now. The 12 Aces who had turned in a fine time of 3:18. started were reduced to six, four of Observing the SAM 27 activities, whom belonged to SAM 27and only two Solenberger (SAM 27) spent most of remaining to MAC. Round Two changing incidence settings. It was quite apparent that SAM 27 was (Rumor has it that most of the SAM 27 in deep merd and only a miracle (called Aces were trimmed like their R/C Trashmovers in Taft) would prevent a models; nose heavy and left turn only.) humiliating defeat at the hands of the Ron Keil, who had been engaged in extremely capable and well prepared some spy work at the MAC practice MAC team. (Columnist's note: Nothing

10. "S o that's how you do it!" Maryann Pond gives hubby some pointers on flying R/C O.T. 9. George Armstead, SAM 27, is a prolific builder. See if you can identify all of them. Complete as she maneuvers his Dallaire Sportster. list is in text. Oh no, George! It's starting to rain! 38 MODEL BUILDER 11. Everybody wins at the Planesmen (SAM 29) Labor Day meet. 12. Gorgeous 1/2A Texaco version of Michael Roll's Berryloid model, C.D. Dave Benepe in a hurry to make awards before table folds! by Marion Knight. This and photo at left by James Buice. like rubbing it in!) commandeered Nick Sanford's huge Photo No. 3 shows Ron Keil (SAM 27) compressed air bomber, and were last packing the turns in the motor until the observed flying in an easterly direction poor Ace airframe groaned with the towards their Paris FAF headquarters stress. High winds prevented Ron from and to a well deserved victory cele­ posting a higher flight than 2:24. Then bration. the debacle with Larry Gomez getting The latest information to emanate only 62 and Sanford also of SAM 27, from MAC headquarters is that another recording a 48 second flight. rubber meet will be held on November Reduced to two competitors, the 15 to acquaint one and all with the MAC team nevertheless flew to prove mysteries of rubber power flying. this squadron needed no more than two Pierre Flapbon has gone one step Aces to win. Stober and Hurley both further and announced a Wakefield posted flights o f 1:70 and :45, the last a type competition will be held in the very heroic flight. early spring of 1982. This column will be SAM 27 was down to their last man. Ed Solenberger carefully wound the hand 13. Shereshaw Cumulus scaled down to Class stripped motor and launched with the A size by SAM 29 member Ken Millet. realization that he needed a 12:43 flight Buice photo. to prevent an overwhelming MAC vic­ tory. Ed had to settle (or a 1:20 flight. At 1:15 p.m., the close of the compe­ tition, the final scores showed MAC with 20:57 and SAM 27 with 12:00. At this time, Pierre Flapbon awarded MAC members, Gordon (8:21), Makinson (7:17) and Stober (5:19) individual prizes for their sterling performances in post­ ing the highest individual scores as well as the highest team score. This crushing defeat of SAM 27 had been accomplished with only seven of the allowed nine official flights. (MAC pilots later disclosed that they had not used their backup aircraft, as permitted, as a gesture of goodwill and also to prevent a complete rout.) Photo No. 4 shows the survivors of this meet. No question about this site, it truly is a diary farm! Noting the Brennan (MAC) took four places, the next five positions were held by SAM 27. Pierre Flapbon then awarded the famous (infamous?) "M erd Hopper” Award to Ron Keil. As can be seen in Photo No. 5, Keil must prominently display the trophy until such time as the SAM 27 squadron has challenged and defeated MAC in a rubber powered flying event. At the conclusion of the award cere­ monies, the MAC pilots and crews

JANUARY 1982 39 14. Bob "Bucky" Walter, SAM 41, shows off his successful Lanzo 15. Flyoff for the Annual Burnham-Sheelds Twin Pusher Award at R/C Stick. Saito 60 ignition engine. Old Warden Aerodrome. sure to spread the word! motor. Dyer, in those days, was one of ENGINE OF THE MONTH the few modelers who preferred the This month's engine is one of those smaller size motor. Dyer was able to start local engines that never attained na­ and run the engine with some modicum tional prominence although used rather of success, as the motor exhibited hard extensively on the West Coast. In this starting tendencies. (We didn’t have any case, we are referring to the Micro 19 starters in those days.) engine as produced by the Hovsepian When the Ohlsson 23 flooded the Brothers, of Berkeley, California. market with its excellent performance, Strangely enough, the company still the Micro engine, along with many exists under the name of the “ Model other engine manufacturers (Hal Atkins, Airplane Co.” but the title is completely Jack Keener, etc.) were promptly by­ misleading, as they have nothing to do passed by the modelers desiring reli­ with model airplanes now. ability and power. The Micro engine first made its debut Information was rather scarce on the in 1938, w ith Al Hovsepian flyin g a 16. A Ken Willard "C AVU " by Alex Imrie. Micro, so this writer had to lean rather of England. Frog 1.75cc power. Built from model designed by Dick Schumacher April 1938 M.A.N. heavily upon Bruce Chandler’s analysis called the "Microbe” (tricky name!). of the Micro engine. From a technical This writer, who first saw the Micro this reason most everyone flew the large standpoint the engine appears to be a engine run, was not overly impressed models. .20 cu. in. displacement based on a bore with this small engine. The big engines, With the advent of Class A, Al Hovse­ of .64 and stroke of .65. No power figures such as the Brown, Ohlsson, Dennymite, pian kept plugging his engine and etc., were the reliable motors and for eventually induced Jack Dyer to use his Continued on page 82

OLD TIMER Model of the Month Designed by: Ed Lidgard Drawn by: Al Patterson Text by: Bill Northrop

• “ Hi-Ho Everybody” . This was the plopping the wing on top (hmmm ... hours later the pod was ready for cover­ familiar greeting used by Rudy Vallee.a wonder, if it was supposed to be “ Hi- ing and the landing gear installed. When famous singing entertainer/actor who Lo” ). finally covered and doped the model has survived through many generations. To quote Ed from his construction struck me as looking silly. . . but it really We’re sure Ed Lidgard can still remem­ article in the February 1941 issue of Air isn't! For its length, strength and large ber him singing “ My Time is Your Time” , Trails, the reasons for the combo job cross section, the stick and pod are but we’re not sure if the name of Ed’s went this way: remarkably light. Total skin area is less, combination Wakefield/Stick model For some time I had been toying with consequently there are less drag and less came from that greeting. The conver­ the idea of a rubber model with a high weight through smaller area of covered sion from stick to Wakefield was simply wing a la Zipper. Then the idea of and doped surface. When the motor was accomplished by installing a cabin/ making my stick model into a conver­ pylon unit on top of the fuselage and sion began to have possibilities. Two Continued on page 82 40 MODEL BUILDER JANUARY 1982 FULL SIZE PLANS AVAILABLE - SEE PAGE 108 41 Rough River Champs, Doolittle Trophy Dash finalists (I to r): Gale Jacobson and caller Lew Hipkins, caller Jack Clark and Roger Schlenker, caller Jimmy Moorehead and Jimmy Bartels, caller Harvey Oxenreider and Bobby Block. PYLON * GO FAST and By JIM GAGER T u r n L

From when the first deluge of contes­ Midwest, makes the site centrally lo­ tants started to pour into Rough River, it cated for the hot-bed of Q M racing that had become apparent that with so many prevails in the eastern half of the U.S. participants, future events would have The fact that Bill Marshall and his staff to be broken off into their own separate at the park go out of the way of their weekends. Pylon lucked out with the required duties to make everyone feel first weekend after Labor Day being comfortable and welcome, serves to selected as its traditional weekend. • So. you're sitting there with your QM So, for the ninth year in a row, a group all ready to be painted, patiently await­ of die-hard, go-fast enthusiastic, wild ing the column on painting we promised and crazy guys ... 39 this year . . . in our last column. Well, you’ll have to returned to Rough River to find out wait another month, as the necessity of who’s best. Coming from as far as New building a couple of new racers for York, Georgia, and Oklahoma, it could Rough Rivers took precedence. Sorry truly be called a National Contest. Why 'bout that! travel so far? You ask.. . ROUGH RIVER, KENTUCKY! Well, it’s not just to race, although this If you’re a Quarter Midget racer, race represents the pinnacle of QM those words should bring to mind the racing. Few other races attract as many biggest race of the year . . . a fitting good racers as this one, where with a climax to the 1981 racing season. Billed little good lu ck. . . or at least no bad luck as the Quarter Midget Nationals/Jimmy ... virtually any entrant can win. Every Doolittle Trophy Dash, this race has heat is a tough race, and to place first, evolved out of the massive undertaking you need to win every heat you're in. nine years ago by an Association of It could also be the flying site that Indiana and Kentucky model clubs. attracts so many repeat contestants. Their first contest consisted of QM Being held at Rough River State Park Pylon. Pattern, and Scale contests, plus (located approx. 100 miles south and helicopter and seaplane demonstra­ slightly west of Louisville, KY), in some of Wayne Yeager, NMPRA V.P. passing out acco­ tions. all rolled into a 2-day weekend. the most scenic territory in the southern lades, money, and silverware. Rough River. 42 MODEL BUILDER Shorty Holsdaw, C.D. at Rough River. Thanks Top five at Rough River (I to r): Doug Brueshaber 1st, Bobby Blouch 2nd. Rex Knepper 4th, from all the contestants. Shorty! Forrest Whitson 3rd, Rich Steine 5th.

Jim Moorehead not only calls 'em well, he also gives his pilot a good Bob Hisey, the "m outh" of the Toledo Weak Signals Trade Show, head start for the race. looks back at the cameraman.

make this event more than just a race cool compared to what we’d grown One of the contestants who had two weekend. Proof of this is in the number used to having at this race. In the early of those zeroes was . .. TA-DA! Dave of racers who bring their wives and/or morning prior to the start of racing, Latsha. Seems he had another mid-air in loved ones along to vacation in the everyone was anticipating very low his 2nd heat. Stay tuned. I also noticed Park’s clean and comfortable lodgings heat times due to the cool temperatures. that the times weren’t very great . . . like and avail themselves of the many park A slight tailwind didn’t appear to create 1:36 was fast time up to that point. amenities. Many contestants fly in to the any take-off problems. Maybe changing the pylon direction full scale airport prior to its being shut The first three heats were a portent of into the wind did the trick, or maybe it down on Saturday and Sunday for the things to come, as in the 1st heat there was the warmer temperature (now up race. was a mid-air and two planes were to about 60), that made the difference, And, not in the least, it could be due to totally wiped out; the other two planes but times started to drop almost as fast as the host club, the Louisville R/C Club, in that heat flamed out for zeroes. In the Continued on page 80 which has sponsored the event since its 2nd heat, another mid-air totally elim in­ inception. Many of the same club mem­ ated two planes, a third flamed out and bers have returned year after year to the 4th limped around for 10 laps and work the race. .. some of them traveling four big points. In the 3rd heat, another hundreds of miles to stay at their own mid-air as yours truly and Dave Latsha expense so that others may enjoy their met before reaching #1 pylon. Dave’s hobby. Our thanks to everyone at plane, a brand new Rivers (which he kits) Rough River for a super weekend of had just been built and finished a week racing. prior to RR, was a basket case. Mine, also While passing out thanks and acco­ brand new, fared a bit better. Stay tuned lades I musn’t forget our friends at for more about Dave “ Bad luck or no World Engines. The only outside help luck at all” Latsha. By the end of the the Louisville R/C Club solicits is in the second round, the wind had picked up area of fuel. For the last nine years World to the extent that it was necessary to Engines has provided them with the best move the pylons, which gave me a available. So, racers, when you’re in that chance to take a break from fixing my hobby shop to pick up a gallon of fuel aircraft to look at the scoreboard. My . . . remember who our friends are and sharp eye caught the fact that there were buy W.E. products. a lot of zeroes on that board for so early THE RACE in the race . . . I counted a total of 39 This year, the race was moved back a goose-eggs. That meant that half the week due to a scheduling conflict at the number of flights in the first two rounds Rough River trophies, plusa "Thank You" park, and the weather was unusually had received zeroes. diploma for work crew from contestants. JANUARY 1982 43 The prototype of a new Dumas kit, Jerry Dunlap's tunnel, designed around the K&B 7.5 out­ board, the prototype of which you see stuck on the aft end!

Denise Dunlap, age 9, holding her dad’s R/C POWER latest tunnel design. BOATS By JERRY DUNLAP

PRODUCTS THAT HOPEFULLY submitted for publication, the kit was WILL BE IN USE still being prepared. So, what I’m going Writing this column is usually a chal­ to do is tell you a story about how it lenge. and this m onth’s offering is even came to pass that a boat I designed more of a challenge than usual. Since ended up being offered as a kit. Let’s 1966. I have been doing kit reviews of begin this story like all really good various types of model boats. I have no stories begin. idea how many different kits I’ve built Once upon a time a well-known and reviewed in the last 15 years; but it’s manufacturer of model engines for been a bunch. I’ve built, photographed, boats, cars, and planes decided to offer a run. and reviewed hydroplanes, sail­ larger version of its very popular .21 c.i. boats. deep vees. tunnels, and even a outboard. This engine manufacturer, jetboat. This month's column is unique K&B Manufacturing for those who have in that the boat under consideration is been off hiding in the woods some­ one that I designed and is being offered where. took some existing parts, created as a kit by Dumas Boats. The question a batch of new parts, and created a .45 could well be asked, "H ow can Dunlap c.i. outboard. Said engine manufacturer throw a kit review at us when he's very spent over two years in developing and involved in the product?" That certainly refining this new offering. Occasionally, is a valid question and presents some photos and information appeared in The prototype K&B .45 Outboard on a challenges in answering. model publications telling about the 7.5 Teague Model Marine motor mount, attached In actuality, this is not going to be a outboard. Model outboard enthusiasts to transom of tunnel. true kit review. At the tim e it was throughout the land began salivating at

Steps in hull assembly, starting w ith cut-out main frame parts. Assembly went rapidly. Jerry using Hot Stuff Super T for the first time. W ith no severe bends, the planking goes on w ithout much difficulty.

44 MODEL BUILDER Seal interior of hull with paint or epoxy Clamps, tacks, and masking tape hold deck Front cowl clamped in position. Rear cowl before attaching the deck sheeting. sheeting to framework while gluing. framing also shown.

Completed rear cowl with balsawood top portion. A 12-ounce Pylon Brand oval tank is mounted inside the rear cowl.

could be changed. Although I did they were racing only a half mile from design the "Excaliber II,” much of the where we conducted a model boat race. concept of the model was from ideas I spent more time researching this developed by David Knowlen. David model than any boat I've ever designed. designed the 1979 versions of the Circus It was time to start laying lines on paper. Circus and SquireShopunlimited hydro­ A half-dozen erasers on the tops of my planes. I decided to use an eclectic drawing pencils disappeared as I at­ approach in the design of a tunnel tempted to get my thoughts down on suitable for the 7.5 outboard. Having the drawing paper. One might think that built and run a whole bunch of .21 size drawing up a model boat about three tunnels, some fairly definite ideas were feet long shouldn't be all that demand­ generated. My primary design concern ing of a task. Such was not the case with Rear cowl being fitted to hull prior to was to have a model that had scalelike this boat. Believe me, there was an sheeting. appearance. Besides eyeballing numer­ abundance of labor expended in the ous photos of full size tunnels in Power­ process of getting this boat on the the thought of having a larger size boat magazine, I did some serious drawing board. With the completion of outboard available. looking at the real tunnel boats while Continued on page 80 Having actually seen the 7.5 outboard while touring the K&B Manufacturing facility back in December of 1980, this model boater was drooling over the possibilities the 7.5 outboard would offer in the way of boat designs. Espe­ cially appetizing was the thought of designing a tunnel hull for this new powerplant. Besides reviewing kits that others are offering, your monthly model boating columnist has designed quite a few model boats. Back in December of 1979, MB carried the construction article I submitted on the "Excaliber II” tunnel hull for the .21 outboard. One might think the thing to do would simply be to scale up the “ Excali­ ber II” to accommodate a 7.5 outboard. And for awhile that was a possibility I was considering. There were a few things Boat hull completed and ready for painting. about that design, however, that I felt

Lots of room for radio. Prather Radio Box Seals and K&B Throttle The boat in action, on Lake Waughop. Tacoma, Washington. Rides Linkage Kit used for rudder and throttle control. very smooth and clean.

JANUARY 1982 45 R/C AUTO NEWS By DAN RUTHERFORD

PHOTOS 8 V AUT HOR New BoLink body, complete w ith decals to duplicate PLN's own racing Turbo XZ.

• Anybody who writes for a magazine Bill smacked a barricade real hard, re­ "O f course, had to find all of the really shouldn’t be trusted. You know moving a big chunk of the Kydex bump­ tricks, you know.” that, don’t you? If in doubt lissen up. .. er. Between rounds I asked him to fix it, "W hat’d ya find?” Remember back a couple of columns pointed to Daughter’s Car as a source for "U h, nothing, really. Bunch of holes when I had a serious look at Arturo’s a new bumper and left to corner drilled in the hangers and some extra Delta Super |? Right, the car used to win marshall. By the time I got around to machining on the cross-bar.” the World Champs. Pretty special piece making sure it was right. Bill was up for "I told you about that stuff, but I don’t of racing equipment, especially in the the third heat in just a couple of minutes know if I should tell Art that you tore the eyes of the Campbell’s and Arturo and had taken the bumper from Art’s car apart.” Carbonell. lust spare parts to the Dirty car. No time to change it, of course, so "N o sweat, I’ll tell him, besides I can Racing Team, though. he got to drive a full heat, the car being get it all back together just as good as Here’s what happened . . . Bill Camp­ led by a bumper of World Champ class. new .. . trust me. Might want to take a bell was asked to send the car out to me Didn’t help his driving, by the way. good look at that motor when you get it and I doubt very seriously that he But I can now say that the DRT uses back, though. A little piece of something checked with Arturo before agreeing to World Champion RC cars for spare parts went through it, you can see scuff marks the scheme. The car got here on a Thurs­ at club races and you better believe that on the piston and cylinder.” day or Friday, and as we were getting nobody else can make a similar claim. (A soft, how-did-l-get-into-this sigh is ready for a race that weekend, I decided As these things generally go, actual heard from the end of the phone con­ to dissect the car later and just hung it picture taking got put off a couple of nection clear back in Iowa.) . . . "You up. Race day came, Clean Cheri had weeks, and the car was left disassembled, have the motor apart?” company over. Dear Daughter was just easier to write about it that way. " 'Course, had to see if it was really going somewhere, so we had two spare, About a month after first receiving the stock.” ready-to-race Super J’s doing nothing. A car, Bill Campbell calls and it just happens "A nd it was, wasn’t it?” call to Bill Clark, longtime friend and that I am halfway through the article (A hesitation cough and stammer 1/12 scale racer, found him fairly willing when the phone rings. Conversation comes from the Washington end of the to try 1/8 racing with one of the spare goes kinda like th is.. . line.). . . "Yeh, it was stock, looks exactly cars. Packing the van, I tossed in all three "Dan, you done with Art’s car?” like my own Picco inside. You know, the of the DRT's Super J’s, then remember­ "N ot quite, pics are done but I’m article would have been a lot more inter­ ing we were expecting some racers up looking at half a stack of blank pages, so esting if the car and motor had a few from Portland and that they would it’ll be a day or so.” exotic tricks to them. From this end it probably like to see A rt’s car, we threw it "W ell, we’re going to a race this week­ would have been better if the car were in, too. end and Art wants to take that car with hand-built from titanium and magne­ At the track, sure enough most every­ him .” sium. Why can’t you guys do things like body wanted a look at the W/C’s car "Can't do it, have to finish the article the other factory racing teams?” and, also sure enough, a few asked if I first, so it would be pretty hard to get it We will leave the phone conversation was going to race the car that day. And clear back there in time. Don’t worry at that point, as the last remark brought each time I answered that I didn’t plan about the car, though. It’s sitting right the salesman out in Bill, starting off with on racing it, only brought it along for here on my desk. In a million pieces, but the "w e race what we sell” part of the spare parts... it’s all here.” program. The conversation ended up About the second round of qualifying, "You took it apart.«’" with me promising to put the car back

Parma Panther 1/12 scale car; Lexan chassis pan, "glass radio tray. Latest GT body in 1/12 scale from MRP. Miller Mustang, or light wheels, and more. Zakspeed Mustang. 46 MODEL BUILDER together, new gaskets in the motor and all, sending it off to Delta just as soon as possible. Several weeks later, I happened to call Delta and Ken answered this time. Seemed that he, Georgia, and Art were going to Spain. And still needed the car. Cost me ten bucks to send it UPS Blue Label. And the car got there the day after they had left for Spain. No, you can’t trust writers, at least not this one. THE VERY LATEST IN CHARGERS... Finally, there is available a truly auto­ matic charger for the 1/12 electrics. There will no doubt be others coming out, but the first production unit comes from Delta Mfg. with the Peak Detector Charger. And it really is automatic, as you just set the thing and walk away. The tricky internals do the rest, bringing the pack up to peak capacity on whatever Latest in trick chargers, from Delta. Fully automatic, set it and forget it. A real breakthrough amperage rate you dial in, and when this in charge technology. full charge condition is sensed by the slow-charge. that, however. You should probably charger, it terminates the fast-charge Figuring that such a charger had to be realize that this charger, like all the other cycle, going to a trickle charge. too good to be true, the first few times I stuff Delta makes, is designed for the Operation is pretty simple. You hook used it I would watch things very closely, racers out there, racers who have a good the input leads up to a 12-volt source, at the end of a charge would even understanding of how to handle NiCd either a 12-volt battery or a 12-volt double-check the pack on a couple of batteries. If you don’t know much about charger, plug the output into the car chargers that have proven to be very NiCd’s, only havean electricfor squirrel­ pack, push the "start" button and set the reliable and accurate. Each time, these ing around in the street, you may be amperage with the knob just to the right separate chargers verified the pack was better off just using a $40 timer-equipped of the “ start" button, and the range is indeed charged to capacity, yet not charger, putting in a 15 minute charge from 0 to 4 amps. This charge rate is over-charged. Now I just take the usual when the batteries are discharged. It shown on the meter when the "select” precaution of not charging packs that generally takes these chargers 18 to 20 knob is in the 0-4 AMPS position. De­ are still warm from discharge, am careful minutes to fully charge a pack, so 15 pending upon whether it is a 4 or 6-cell to select a conservative amperage setting minutes is pretty safe, plus you don't pack, the "select” knob is switched to (always a good idea unless you’re in a big need a 100% charge unless you’re racing. the 4-8 VOLTS or 8-12 VOLTS position, hurry), plug it all in, and leave it to do its Besides, the present ultimateinchargers, providing an approximate reading of thing. this Delta Peak Detector number, sells voltage. For a super accurate look at how And it’s beautiful. No more blown for $125 and you have to be a fairly fast the voltage is rising, the S-ESV (Super packs from forgetting they are being serious racer to invest that kind of Expanded Scale Voltmeter) position is charged. I’m just as prone as you to money in support equipment. selected, the meter needle centered distractions, yet when I need a fully- But if you’re into electric racing in a with the adjustment knob at the upper charged pack, there it is, all ready to go. big way, and would like to be able to do right. Each division on the meter then In fact, at this very moment there is a car something besides watch a charger or equals 20 millivolts, so even the smallest on fast-charge back in theshop. Not that voltmeter between heats, you have to rise or drop in pack voltage is clearly unusual, as I tend to take lots of little take a good look at this new charger. visible. As the charger terminates fast- breaks when writing, often sneaking out Start saving your pennies and nickels! charge automatically, this is more of a to the cul-de-sac for a few hot laps, but PARMA’S NEW 1/12 C AR.. . convenience feature than anything else, now I can do it without constantly jum p­ Been hearing about a Parma 1/12 car but you can use it to watch the voltage ing up to check on a charger... or toss coming for a long time, with the pro­ peak, and then drop off 20 millivolts, ruined batteries in the garbage. posed name being the Tiger, and now it triggering the charger into switching to Wouldn’t be fully honest if I left it at Continued on page 76

The new K&B .21, mounted in the PB suspension car. Hasn't been Modified Associated diff for Parma Panther, permits removal of fired up yet, but looks real good throughout. rear wheels without changing diff setting. JANUARY 1982 47 An 050 sportplane, by Frank Stokes, Courtenay. B.C.. Canada. Four 020 motors push this model by Frank Stokes. Makes impressive Cannon Super Micro 3-channel on elevator, aileron, and motor speed. sound. Flies well. Cannon radio on rudder, elev., on-off motors. - ELECTRIC POWER By MITCH POLING

• Naturally, when things happen, they wins. Besides the high dollar first prize, have seen it dead calm there, and I’ve all happen at once, and electric meets second prize will be a Futaba 4-channel seen it blowing 20 mph! So it calls for a are no exception. Last year I had to radio, third prize a Leisure Electronics design with fast climb, good penetration, decide between the IMS Show and the digital charger, and there will be a raffle and low sink rate . . . a design challenge! Astro Flight contests; now there are two for Sanyo products (consumer electron­ The next contest after this one is the coming up again within one week of ics — not decided at this time). If that is 8th annual electric championships, on each other! The first one, on the 9th and not enough, there will be $100 prizes for Sunday, January 17, 8 a.m. to 2 p.m. at 10th of January, will be sponsored by the most original direct drive entry, most M ile Square Park, Fountain Valley, Cali­ Leisure Electronics, Sanyo, and Futaba, original gear drive entry, and the old fornia. There will be nine events ... a and the stakes are high! The first prize is timer with the most appeal. The entry real smorgasbord! These will be: Jr. free $1000, the most, I’m sure, ever offered in fee is $10, the meet will be in Anaheim, flight (under 16 years old), free flight an electric contest. The rules are simple, near Disneyland, and if you write Leisure scale, Old Timer replica free flight (Astro the power unit must bean Astro Flight or Electronics, 11 Deerspring, Irvine, Cali­ 020), R/C powered sailplane, sport a Leisure Electronics 05 motor, it can be fornia 92714, you can get the official pattern, sport scale, R/C electric old geared or direct drive, and the battery rules and directions for finding the timers, and electric scale control line. I pack must be an 05 battery pack sold by contest site. The fee goes up to $15 after am very pleased to see the control line Astro Flight or Leisure Electronics. This Dec 10, so hopefully this will get to you event in there. The first two electric means the battery pack can be either in time! (Not likely — wen) championships (1974-75) had thecontrol eight .550 Ah cells or six sub-C cells, It is fun to try to guess what type of line, which I thought was a lot of fun. either GE or Sanyo. The flyoffs will be plane will win. My own feeling is that a Then somehow, it disappeared. The man-on-man, for a 1-1/2 minute power lightweight glider with gear drive stands Guillows or similar type kits make run, and a total 7-minute max (including the best chance. You need about 1000 excellent control line with the Astro 020, the motor run). There will be no landing feet of altitude to get a 7-minute max in as the Black Sheep Squadron, headed by points on Saturday; landing points may still air. Gearing allows a very steep Tony and Addie Naccarato, have proven be used on Sunday to break ties. The last climb, and this with a folding prop so well. There will be 10 points for flyoff on Sunday for the grand prize will should do the trick. The only variable in realistic takeoff, 1 point per lap up to 10 be pure duration, the last man down this is wind; and at that time of year I laps, 10 points for realistic landing, 10

JoMac 803 Digital charger. Described in text. JoMac 801 charger. Has advantages of digital charger, but for less cost.

48 MODEL BUILDER points max for static scale, and 10 points and MRP, and this is a good time to which is to charge up to a voltage peak. for a loop, wing over, or touch-and-go. follow up on that, especially since I have The NiCd pack will display a characteris­ For us types that live where there is some photos of some of the JoMac tic peak at its full charge, somewhere in winter, these electric control liners are chargers. Before I go into that, though, I the vicinity of 10 volts, if a six-cell sub-C perfect for indoor gym flying. Anyhow, would like to clear up a possible mis­ pack is charged from 12 volts. The 10- this annual championship has always understanding about the CE GC-9 bat­ volt (roughly) reading is not the actual been a lot of fun for me, a lot of it tery. I mentioned in a recent column voltage of the NiCd pack, however. because of the fantastic variety in designs that the cells in this battery make an NiCds can charge up to about 1.5 volts and aircraft you see there. The entry fee excellent super-lightweight receiver each just at the start of overcharge, so a for each event is $4, or $10 for all events. pack, but I forgot to say that you only use six-cell pack should be reading about For information and fees, write to Bob four cells. There are six cells in the GC-9, nine volts at full charge. This peak fades Boucher, 2301 Cheryl Place, Los Angeles, so take two out before you use it! I don’t very rapidly (within seconds) when the California 90049. know if the higher voltage of six cells charger is disconnected, so it is a lot In the last column I ran some photos would burn out a radio or not; I think more reliable to keep the charger on so from readers, and this time let’s look at most likely it would not, but the servos the peak will hold a steady reading. So, some that Frank Stokes, of Courtenay, would sure move faster! It would also be what happens is that 12 volts are going B.C. (Canada) sent. Again, these have jittery, I think, because of increased into the charger (from the charge bat­ been held up much too long, almost a sensitivity. Anyhow, on to charging. Six tery) and nine volts are going out, so the year. I’ll make a New Year's resolution to cells is the big change in the 05 scene for meter averages them, 9 plus 12 divided get reader’s material out faster after this! planes, and I think six cells will pretty by 2, to get 10.5 volts on the display. I’ll let Frank make his own comments on much take over from eight cells, for a Flere is where the rub comes in; the planes. "I have experimented with couple of reasons. The first is that it is because most charge batteries do not foam wings a lot and I'm coming close to easier to put a complete charge into six hold a good 12 volts when under load, built-up weights. I’m using the foam asa cells (from a 12 volt source), and the they ” sag” , down to about 11 volts, so 'platform' fortheshape of the wing, with second is that you get a longer run time, the average comes out to about 10 volts. balsa strip over that. With this I can get since sub-C cells are used. I have found This would be all right if the battery is in intricate airfoils and wing shapes much that routine charging, with no special good shape (that is, fairly new, fully easier than with ribs. I am quite happy care, will give six-minute flight times charged, and at least six Ah capacity).

Pusher with 050 power, 37" span; elev., aileron, two-speed motor, JoMac 804 charger. Good standard unit. See text for more details. Cannon Radio, Charlies Goodies kit servos. By Frank Stokes, Canada. with the slim semi-symmetrical airfoil with the sub-C cells. Digital charging will But. most of us, including me. take tapering to Clark Y at the tips. It is quite give more time, about eight minutes, on shortcuts, and use below-par charging fast, and does not require washout a sport type 05 plane. Most fliers will do batteries. In this case, my full scale car (which does rob lift). I have not tried this routine charging, and six minutes is a battery, three years old! I noticed that I airfoil in high winds, we just don’t have satisfactory flight time. could not charge consistently to the any, but there does seem to be less I have been doing the digital charging same peak after the first charge. This led zooming after a dive. In the future, I will with the Leisure Electronics digital to frustration, as I could not really tell probably be going into multi-motor charger, which I have found to be when the pack was fully charged. Then, I models as this is so easy with electrics. excellent. However, I have found that happened to look at the meter when a Another project I want to follow up on is the LCD display can absorb enough heat NiCd pack was not on charge. There was an extended shaft drive on the motors. in direct sunlight on a hot day to cause only 11.5 volts on the car battery! So. the My present planes are rather blunt damage. The sign that there is a problem voltage from my car battery kept sliding nosed because of the large frontal area is a display "blankout", which goes away "dow n hill” , carrying the voltage peak I of the motors. An extension could also once the charger is put in the shade. If was looking for with it! No wonder I save a lot of bent motor shafts!’’ this happens a couple of times, the seals never got the same value twice! If you Thanks, Frank, for the report. Frank’s inside the display start to leak, with have a similar problem, just disconnect 05 sport plane looks really slick, and the streaking of the display. I didn't put two- the NiCd pack that is under charge, and four-m otor sport plane looks good, too, plus-two together until I let it happen, so see if the charge voltage on the meter is It looks easy to build, since m ulti-motor now I have a slightly flawed display. It the same as when you started. If it isn’t, is such a natural with electrics. It's a pity still works well, however, but, a word to that’s your culprit. Just to cap it all. that that there are very few plans for super the wise, keep LCD displays in the shade car battery, despite the fact it loses simple multi-motors for fun flying. (If for long and unmarred life. The JoMac voltage, functions just fine in my car; it nobody submits ’em. we can’t publish digital charger uses an LED display which starts it, runs everything, and does its ’em. wen) does not have this problem, but it is job. It goes to show that digital charging Lately, I've talked about charging, harder to read in the sunlight. can tell you more than you want to particularly with the digital chargers, Another problem I have encountered such as produced by Leisure Electronics is at the heart of the digitial technique. Continued on page 78 JANUARY 1982 49 Piper L-4 by Jim Newman, from Midwest foam ARF kit. See Jim's letter in this column, for all info. sport scene By LARRY RENGER Balsa strip per by Master A irscrew . Save money on strip wood!

• Some lime ago I wrote up a "what the them or get their source. Anyone who you’ve probably guessed, this is used to world needs" list which included "extra knows what the material is likely to be, hold it on. lightweight plastic film covering mate­ please let me know so I can pass the info You’ll also need some clear dope to rial". Happily,several readers responded on. paint the balsa frame to be covered. This with their suggestions. By far the most Next, Bob Strought reminded me of isn’t essential, and can be eliminated comprehensive reply and source of the existence of 1/4-mil mylar both in (perhaps Balsarite could be used to good information was Ron St. )ean, long time clear and "chrom ed” versions. Bob dis­ advantage here? L.R.) when weight is to nationally competitive free-flighter. I covered the material while making be kept to a minimum (i.e. a Peanut) but will describe Ron's input in depth, but radiation detectors for the Air Force in it, too, will reduce a lump appearance of first let me cite some of the other 1964. He has covered most of his models the adhesive. contributions. with it since then, everything from Then you'll also need the usual stuff Jerry Simon, of West Hollywood, Cali­ Peanut Scale to 8 foot R/C gliders. He is you use with Monokote: hotshoe, air- fornia, has used the material used to really turned on to the thin mylar for gun, sharp knife, etc. And, of course, shrink-wrap LP records. He bonds it to general use. Bob offers the following you'll need something to cover: a wing, the structure with a mix of white glue instructions on the care and feeding of open frame body, or tail, or what have and water, then he has found that it may thin mylar film: you. But don't make it too flimsy on your be painted with AeroGloss or similar Okay — let 's suppose you want to try it first try because, like Monokote, this paints. Jerry says that it shrinks nicely out yourself. First thing you'll need is covering can, with continued heating, with his Monokote iron at the lowest come contact cement. . . not the water- shrink like the devil and warp lightweight setting. Weight comes in lower than base kind that dries slowly, it won’t stick. open frame balsa structures. If you don't Sig's lightweight silk span. I have heard Only the rapidly drying solvent base have anything, or are in a hurry just to try that most large record ships have this kind will do and the brand really doesn’t it, let me suggest using the top of a can, material in the back room to re-wrap matter. I prefer to get it in pint cans and such as a coffee can. records which have had the film dam­ thin it out slightly with lacquer thinner Okay, here’s the procedure: aged or otherwise need protection. You so it spreads thinner and doesn’t make 1) Like any other covering, cut an may be able to obtain the stuff from unsightly lumps under the covering. As Continued on page 97

Harry Stewart's cute little 1/2A biplane held by a cute little girl. How about some identifi­ Top Flite's updating of its famous line of R/C kits now includes the Headmaster Sport 40. cation, Larry? 50 MODEL BUILDER Trøeft/B

• You’ve all seen it happen a dozen or was it free to tumble aft during the plane out for its first flight . . . wish times, do I gotta draw you a pitcher? It’s launch? Were the batteries fresh? Was Daddy luck.” one of those gentle midsummer morn­ the receiver antenna extended, or lying If old Stanley had any sense of the ings at the flying field, the kind of like a wad of spaghetti inside the fuse­ time/money/ego involvement in that weather that brings out all the once-a- lage. first-ever R/C job, he might not have year modelers, those guys with dust on Stanley Stiktime didn’t check any of tossed it up in the air without so much as their wings and no flags on their trans­ these things before launching poor a pre-flight. Hell, he didn’t even check mitters. Here comes old Whitey Paleskin Sheepdip’s model. And yet Stanley is the balance point before that first test with his silk-n-dope Craupner “ Cirrus," considered to be the club expert . . . glide! But Stanley’s radio is long since flown exactly seven times since 1969. which he is. But that’s just the problem. paid for. His tools, his building board, his And that guy with the Orbit radio . . . He's so damned expert. . . at designing, supply of Kwik-links and Super jet are all isn’t that Rodney Rarebird? Why, I at building, at flying . .. that he’s forgot­ amortized over dozens of airplanes, haven’t seen him since. .. ten completely what it's like to be a over years of modeling. But look . . . here comes a brand new beginner. But poor Shelby Sheepdip is in another face with a brand new model. It's young He’s forgotten the thousand little place entirely. He’s just bought a radio, a Shelby Sheepdip with his very first R/C traps a beginner can fall into: the clevis sealing iron, a set of knives, three kinds job. a Skygobbler 72. That Skygobbler’s that pops off the servo wheel at full of glue, a metal straightedge, etc., etc. no turkey . . . he should learn to fly in no deflection, the punkwood main spar To him, and to his family, this new air­ time. And he’s asking the field expert, that slips into every kit now and then, plane represents not just a month of Stanley Stiktime, to help him . . . now the chordwise slice you make through hard labor, but $150-400 in cash outlay. there’s a smart lad. the balsa wing skin while trimming your And now it’s reduced to rubble. Stan gives Shelby’s model a quick test Monokote, the drop of Super Glue that He deserves more than just zip-crash- glide, pronounces it flyable. Oh joy! Up gets inside the plastic pushrod, the tough break. the hi-start she goes, straight as an a rr. . . hinge that works fine on test glides but So let’s take a minute to compile a oh, oh! Something's wrong! She’s curl­ fails under high-speed air loads. checklist of trouble spots on beginners' ing over at the top of the launch, picking And, maybe most important of all, models. A check list for experts. Use it up speed, whistling like a bomb now, Stanley forgot the importance of a next time a beginner asks you to play test headed straight down! Stan is shouting beginner’s first model. Because Stanley pilot. It won’t take five minutes of your “ Red & white! Red & w hite!” But it’s no can knock out a complete kit. covered time, and it may well save a lot of grief. good . . . the model goes in at warp-two, and ready to fly, in a week of evenings, Start at the nose of the model and scattering balsa schrapnel all over the he’s forgotten the time and energy that work aft. Open the radio hatch, take off tri-county area. goes into a beginner’s first plane. He’s the wing. Is the noseweight secured? Is it Mark de Sade, always the first guy at lost touch with the weeks of agony, of placed so it can’t short out the batteries? every crash site, is standing over the painstaking building and rebuilding, of How are the servos mounted? Nothing rubble shaking his head. “ Looks like you cutting and sanding and recutting that wrong with usingservotapeinsailplanes, got hit," Mark says. “ Red and white’s go into the first plane a person builds. but be sure it bonds securely to the fuse­ been getting a lot of interference lately.” The uncertainty, the hesitation, the lage wood. Epoxy, glue, or dope on the "Yeah,” Stan agrees, handing poor painfully slow decision-making of some­ wood before bonding makes for a better shell-shocked Shelby his transmittter, one working in an alien medium. And seal. "guess we got shot down. That’s the way the total family involvement: "Daddy’s Operate the controls and check servos it goes sometimes. We all lose a plane building a remote-controlled airplane.” and pushrods for binding. Listen to now and then. Welcome to soaring, "Now Daddy’s putting the plastic skin servo speed . . . it’s the best indicator of kid.” on his airplane." “ Daddy’s taking his Continued on page 92 And Stanley walks away. ★ ★ ★ Now I'm not saying that Shelby’s model wasn’t a victim of interference. It does happen sometimes. But it seems m ore like ly that he was a victim of expert-itis, pure and simple. Expert-itis is a disease that attacks almost everyone who’s been flying for two years or more. Carelessness and overconfidence are its chief symptoms. Old Stanley Stiktime had a terminal case of it. He took one look at Shelby’s model and decided it would fly. Because it was a popular kit, because it wasn’t badly built, because the Monokote looked tight, because the elevator wasn't hooked up backwards, Stanley automat­ ically assumed that young Sheepdip’s model was airworthy. HE COMPLETELY FORGOTTHATTHE PLANE WAS BUILT AND RIGGED BY A RANK BEGINNER. Were the servos fastened down se­ curely? What were the pushrods made of? Was the nose ballast glued in place. ’ WELL, YOU TOLD ME TO .START AT THE BEGINNING, DIDN'T YOU?' JANUARY 1982 51 "Don't select your next project by the span of the model; rather, select it by the span of your attention."

HOW TRUE! boss!). Granger Williams, best known for his R/C scale models (and Williams Bros, products) has ex­ From the intriguing Washington- NON-SCALE NAMES tensive background in C/L and F/F as well. based model newsletter MAX-FAX: The scramble to generate appropriate Chris Clemens caught him in this photo while "One of the best ways to measure (and usually humorous) titles for Bos­ winding his "M r. Smoothie" free flight speed people is to watch the way they behave tonian models has caused a reexamina­ m odel. when handed their scale evaluation.'' tion of aircraft names in general. Cer­ BOSTONIAN DIALOG tainly the British full-scale aviation philosophical item has attracted a great Comments continue to arrive from industry established some kind of record deal of feedback, both regarding the "Bean Pilots" relative to the Bostonian for diligence in this regard. Over the prime subject, the lack of women in model event. So far it would appear that years, they consistently brought forth aeromodelling, and an implied correla­ interest is gaining in several parts of the aircraft appellations as varigated as the tion concerning the motives of males in country as an indoor class, but only on machines themselves. Witness examples the hobby. We think it may just be the the West Coast as both an indoor and such as the BEARDMORE INFLEXIBLE, most thought-provoking article ever to outdoor category. And C02 conver­ the HANDLEY PACE GUCNUNC and appear in a modeling magazine. sions appear also to be confined to the the REID AND SIGRIST SNARGASHER. LAKE LITERALLY LOADED San Diego area. Flying Aces Club members Frank Scott With the escalating interest in restor­ Terry Mrakava. of Illinois, reports an and Jerry Bockius have recently been ing WW-II aircraft, the search for scarce attempt there to include Bostonians in creating ficticious names for their parts has spread world-wide. According an outdoor meet, but only three were models so convincingly, that some to Ray Bolt, of Evanston, Illinois, Lake flown and none were new. Some of the fellow builders have assumed them to Michigan may be a fertile hunting fellows who build Bostonians fly only be legitimate. For instance: The VICK­ ground. It seems that during the war, indoor contests; others who have the ERS VENDETTA; the DE HAVILLAND Glenview Naval Air Station had hun­ 7-gram East Coast rules models simply DISCARD; the BRISTOL BULLHORN: dreds of N3Ns, SNJs, Wildcats, Hellcats, do not want to risk them to possible the HAWKER HARDLY; the AVRO AVA- Corsairs, SBDs, TBFs and even a stagger­ windy conditions. Terry concludes; LANCH: and our favorite, the BLACK­ wing Beachcraft. They alsooperated two “ Just don’t think Bostonian will replace BURN BLAND (an incredibly non­ aircraft carriers on the lake in training Embryo Endurance around here as an descript aeroplane). missions. During these exercises, per­ outdoor event.” MUST READING haps 50 or so planes crashed into the Dave Linstrum. way down in Florida, If you haven't already done so, be water, and some have recently been says he has invented the ultimate name: certain to read THORNBURGATLARGE, located by divers. They are said to be in “ BOSS TON I AN.” (Don't argue with the in the October Model Builder! This Continued on page 96

Ron Limbrick, Canada, built this rubber-powered Polish RWD-2. R/C autogiros with intermeshing twin-rotors, built and flown in Simple profile cut-out pilot adds charm to photograph. France by M. Cousin (plane on left) and Georges Chaulet.

52 MODEL BUILDER f \

Walt's son Curtiss Mooney's completed Laird. Long nose moment The Laird LC-DC doing its thing . . . flying up a storm! With stretch eliminates need for nose weight. Williams Bros, molded nylon prop. winding of the rubber as described in text, long flights are guaranteed! PEANUT SCALE LAIRD LC-DC

By WALT MOONEY . . . A repeat from our December 1971 issue, the long nose moment of this little-known biplane makes it an easy plane to balance. You'll also get a nice, long motor run.

• This is an extremely pretty little bi­ the side stringers in the interest of sheet balsa surface tip outlines, only a plane racer. Its configuration is particu­ simplifying the model will hurt the over­ few specific comments will be made. larly suitable for a rubber powered scale all appearance very little unless you First, the wheel diameter is rather model. The long nose and the long tail worry about the last scale point in a large for a Peanut Scale so it is important length make for an easily balanced and contest. Flight wires can also be omitted to keep them lightweight. Make them stable flyer. Three models of the Laird in the interest of simplicity and less flight out of balsa, or better yet mold them on LC-DC were built and they have all drag if desired. a Vacu-form over a balsa or hardwood proven to be nice flyers. All three For those who are interested in scale form. models are capable of flights of more details and the utmost in judging points, Second, the struts for the wing and than 30 seconds. good three-views of this airplane and landing gear will take quite a beating so The model construction is strictly other interesting racers are available they must be strong and light. Make conventional. As drawn it will not result from R.S. Hirsh. 8439 Dale St.. Buena them from very hard one thirty-second in a particularly lightweight Peanut Scale Park. CA 90620. sheet, or if its available at your hobb> model. However, careful attention to The model should balance about an shop, cut them out of one sixty-fourth wood weights and the use of slightly eighth of an inch aft of the lower wing plywood. (This very thin ply is available smaller wood sizes will result in an leading edge. No downthrust was re­ from “ Sig".) indoor type model capable of even quired on the models built and the Third, the plastic propellers work well, better flight durations. maximum up elevator adjustment was but for even better flight times, a carved The real airplane had a lot of stringers used. wooden propeller with wider blades will fairing out the fuselage. These are Since the model structure is strictly give longer durations. indicated as dash-dot-dash lines on the conventional; a box fuselage with form ­ Fourth, all cowling details shown, and drawings. Omission of one or more of ers and stringers, single spar wings, and Continued on page 89

A three-quarter front view of Curtiss' Laird. Peanut scales are so small The "bones" of Walt's Laird. He's using larger, balsa prop in attempt and light that they survive many "crashes." Great for beginners too!! to increase duration. Wing and landing gear struts 1/64 ply.

JANUARY 1982 53

α Kraft Christmas

Let your neighborhood Kraft Dealer play Santa Claus

What better Christmas present for that novice or dedicated R/C modeler in your family than a beautiful Kraft Radio Control System. There's a complete line of standard systems to choose from - 2 thru 7-channel-and you’ll find,, Santa Claus just around the cornrler at your neighborhood Kraft Dealer.Deale The new K-Line Series KP-2K, -3KW and -4K systems offer premium performance in 2, 3 and 4-channels, at a budget price. These are not stripped down systems, but come complete for flyaway and raceway operation.

© Kraft Systems, Inc., 450 W. California Ave., P.O. Box 1268, Vista. CA 92083 «(714) 724-7146. TWX: 910-322-1471 Our 5 and 6-channel KP-5X Spectrum and KP-6C Gold Spectrum systems are acknowledged R/C standards-just the things for the dedicated modeler and competition flyer-and include many electronic advances which optimize both field performance and convenience.

Finally, there’s the Kraft 7-channel KP-7C system in both dual and single stick versions, the ultimate in state-of-the-art performance for the expert tournament flyer. Kraft's K-LineSerSeries systems are the’budget way to Let your neighborhood Kraft Dealer play go flying, boating or car r.äcin Santa Claus. You’ll be pleasantly surprised at just how much Kraft quality and performance you can put under your tree this Christmas. Í0

spectrum and Gold Spectrum systems are favorites * of dedicated modelers.

l&fT

rátion nS For the R/C expert, an advanced KP-7C system tan make this Christmas a day to rememBer V- € ^ ^ « Event Director Marlin McGee discovered a way to keep Buckstaff Gary Wallace (left) and Don Jehlik during pitting action for Albritton in line. Could that be an oak stake? during FAI at Nats.

By "DIRTY DAN" RUTHERFORD ontrol line PHOTOS BY CHARLIE JOHNSON

• Although it doesn’t appear that much fuel bag (as opposed to a fuel bladder) fuse-mounted container and the other will come of it, there is a bit of letter­ and this container was strapped to the end, obviously, goes to the engine. writing going on now within the CLCB fuselage by, of all things, masking tape. And it seems to work very well. So and it concerns the trick fuel tank The container resembles quite closely well, that it caught lots of SCF’s off cooked up (evidently) by the ΟΓ Master any number of wedge tanks commonly guard, resulting in a few real close looks Wooten and used to good effect on Pete seen on Sport and Slow Combat models. at the legality of the tank. Don’t blame Jaden's Slow Combat models at the Stuffed into this piece was a bag, literally them. Word is that the model was real most recent NATS. The letters are meant swiped from one of those burp-less fast, I’ve heard claims of close to 100 to decide whather or not the CLCB baby bottles. What is it that makes us mph, someplace I heard that the model should do anything about this type of Combat fliers look to suckling babies for was clocked at 98 ... While towing a tank, as in making it illegal, or simply fuel systems? Long ago it was pacifiers, streamer! Well, maybe. FHaving a pretty agree that it is OK, doing nothing at all. still in wide use, now it is liners for good idea of what it would take to move First you should know that at the NATS bottles. There are some real interesting what looks like a fairly large Slow the tank was allowed as legal ... A very suggestions there someplace, but you Combat model (Jaden’s) through the air big hint that while it was a new appli­ will have to think them out for yourself, at anything approaching 100, pulling a cation of an old technique, it also met due to the family nature of this magazine. draggy streamer or not, I am not con­ the rules. And in this case, the rule being Anyway, it appears that the fuel bag is vinced that anything much over 90 is looked at is a requirement that the assembled much like a pacifier or possible, flying the model down low engine run on a suction feed arrange­ bladder fuel system, with the fuel feed where the speed charts mean something ment. line having a short chunk of metal and refraining from putting a lot of arm If you haven't seen pictures or heard tubing inserted and then the bag in it. about it, what Wooten/Jaden came up wrapped to the resulting hard-cored Still, there is a speed advantage from with is a simple plastic container for a fuel line. The bag end gets stuck in the the tank, no doubt. Just as a few of us found out when experimenting with the now illegal inboard-mounted Sullivan plastic tanks, once you get the tank to working real well, a relatively easy thing to do with the inboard tank, you get more speed by screwing the needle in leaner and going heavier on the nitro. Surely it didn't take long for Wooten and Jaden to see this, so of course, the model was faster than most everybody else’s. And the Fox Combat Special obviously wasn’t a dog, no doubt was a real runner, no matter the fuel feed system. Oh, yes, I mentioned that this was an old technique with new application. My very first CL model, actually my Dad’s but I adopted it, was a Jim Walker FireBaby and that thing had a balloon tank mounted in the canopy. Not a balloon that was force-fed fuel by means A true eccentric. Rich Porter, demonstrates unique system for determining turn radius. Eugene of a syringe; just a bag kinda thing that Regionals. Memorial Day. looked like a balloon and that could not 58 MODEL BUILDER Lenard Ascher checks out Mike Greb as he sews on elevator before J.E. Albritton and Northwest Bill Varner during FAI at the Nats. Rat. Mike didn't place in Rat, was 2nd in Slow Rat. feed fuel under pressure, as before the bladder with, say, 1/2 ounce of fuel. The lem should be minimal if care is taken to bag could stretch it would fill the line could lead to a simple shut-off that not pump any air into the bag. just be canopy. There really isn’t anything new, normally holds the line pinched against aware of the fact that any air bubbles you know. .. the fuse but activated to "on” with a going into the engine, especially on a But is this type of fuel system legal in simple push of a finger. From the shut­ WFO run, will probably kill the motor. Slow Contest? Why, of course it is. The off, the line could go to a simple tap in Notice how I use the words motor and engine has to suck the fuel out of the the upper part of the venturi, a regular engine interchangeably? Yes, I know the bag, so that makes it a suction fuel old pressure tap would work, although it difference between the two. just don’t system. There is a theory, by the way, might need to be soldered up and care. that says something about the fuel-filled redrilled smaller. With the fuel system (BFS) working bag being jammed, by centrifugal force, In operation, once the motor fired for reliably, the next step is to more nitro into the outside wedge of the container a match, if for any reason it was neces­ and needle settings that are right on and so giving pressure at the venturi. sary to hold the model, the shut-off maximum power setting. Might even Hardly seems likely, as the fuel also has could be opened, letting in controlled want to play with props that have less to come inboard, fighting that same amounts of fuel, preferably just enough pitch and/or diameter, just to get the centrifugal force, in order to arrive at the to keep the motor from sagging. The rpm’s up high. Don’t be fooled into venturi. yelling and arm-waving and finger­ going by ear, however. No matter how And now, just to show you that I am pointing and questioning of your Mum good it sounds, a stop-watch won’t lie willing to write about something I have and Dad’s relationship at the time of about speed orthe m otor’s ability to pull never tried, a couple of thoughts about your conception, once it was discovered through the turns. You have heard of Baggie Fuel Systems, or BFS’s in Dirtese. that your model had an Honest-to-God timing a model through a series of First, when making the bag, tie it up just pacified fuel system installed, would maneuvers, haven’t you? By all means, like a pacifier or bladder, being real probably make the work in putting it all do it. You may be a little surprised by the careful to not get any leaks, especially at together very worthwhile. results. the juncture between bag and fuel feed Another thought is that when filling The only real problem I see with BFS’s line. The bag should be large enough to the bag for the first time, you should try is the container for the bag. There might completely fill the container without first to get as much air out of the bag as be a few commercially available cano- stretching the bag, as any "accidental” possible, fill it with fuel and then draw ies that will work or a male mold could pressure at the first of the engine run will off any air still trapped in the bag before Ce carved from pine and heated plastic only ruin the needle setting when the hooking up the fuel line and starting the pulled over it. Local Hobby ought to bag goes slack. Or, if using a real big engine. On subsequent refills the prob- have K&S plastic that will work. But the container, just be sure, when filling the Hot Tip would be for some enterprising bag, that you don't put in so much fuel as soul to do up some male molds in epoxy to stretch the bag. Ditto for the reason. and then to contact Model Racing For the first few flights, I suspect that Products, as they have their own vacuum as soon as the model is launched, the molding machine, generally used to do engine will have a bad tendency to go up bodies for the 1/12 and 1/8 scale RC rich. We had the same problem with cars, but also capable of molding many inboard-mounted tanks. The only solu­ other things as well and from a wide tion is to get the motor dead-lean, prime range of plastics, even though their it a touch heavy for the start, and dump standard material for bodies, GE Lexan, the thing just as soon as possible. With would probably by the best, just call the plastic tanks, it was often possible to (206) 823-0800, ask for Bob Welch or close off the vent with one finger while Gary Kyes, tell ’em MB and Dirt sent ya squeezing the tank a little to force some and ask for a quote. extra fuel to the motor. This won’t be SUPER O IL ...? quite as easy with BFS's, although you Was several months ago that I men­ could cut a 3/4 inch diameter hole tioned the new oil available from Delta through the fuselage, right in the area of Mfg. (they are in the RC car business and the BFS compartment, just poking a so just slightly off-center, shy one brick finger through to put pressure on the of a full load, one look in their eyes and bag. you know somebody else is driving, Or you could really drive the compe­ Only Bob Kerr himself could possibly ex­ etc.), an oil that I have used for a couple tition insane by building a small bladder plain this unique stance tor a racing pilot! compartment in the wing, installing a Continued on page 90 JANUARY 1982 59 BoultorvPaul Defiant, by Golden Age Reproductions, span is 25 inches.

FREE FLIGHT SCALE By FERNANDO RAMOS

• I would like to start this month by figured that I should be able to modify it ennial cry that we are not attracting recounting an incident that took place enough to make a reasonably good youngsters into the hobby anymore, it's this past summer. My older son and I had flying scale model out of it. Plus, with a no wonder. Where do they start? gone to the local model shop to buy vacuum formed canopy and cowl, what I've mentioned this before and I think some model railroad supplies for a 4-H a deal! it’s worth repeating. There really isn’t a project he was involved in. While brows­ When I got home and opened the box true starting place for youngsters to ing around, my eye caught a fancy I was disappointed. There were no experience reasonable success with painting on a model box of a WW II vacuum formed parts (there was noth­ building any flying models. I believe airplane. This box cover depicted a ing on the box that indicated or sug­ some changes should be considered. I Focke Wulf 190 with a super paint gested there was . .. h in t. . . READ) the can appreciate the fact that many young scheme. It was really neat. I’ve never structural design wasn’t anything like I modelers are probably attracted to R/C been a sucker for any kind of box cover, had expected. I know, I suckered into first rather than the other modeling but for some reason, this one really the old label game. What’s the point of areas, but I feel that they should have the appealed to me. I immediately had all this? I’m not out to pick on the manu­ opportunity to learn to build light, vision of the model decked out with a facturer (although it would be great if strong rubber models and master the similar paint scheme flying overhead. they issued their old timer scale model basics before "stepping up" to R/C. Naturally, the box was cello-wrapped, kits again, they were great!) or any of the (Some may think of it as stepping up!) and I didn’t want to ask the shop owner other kit manufacturers, but what are However, the way I see it, the chances if I could open it up and take a look. (The the chances that a youngster, who also aren’t that good. next customer might suspect there will falls for the label or cover on a box, can I would like to see one of the ole timer be parts missing.) Since I nad never paid build and haveasuccessfulflyingmodel? kit manufacturers kit a model such as the attention to this line of kits before, I I would say slim to none. With the per­ Pacific Ace as cheaply as possible, in order to introduce both the youngsters and the older novice into the world of modeling. I have another ten kids this fall in 4-H who w ill each be building this particular model. In time, with success, the transition into scale is only natural! In the past four years, or going back to the first Flying Aces Nationals, multi- engine rubber scale models have be­ come a competitive reality. The follow­ ing was extracted from the Flying Aces newsletter and written by Mick Midkiff, who is one of the premier rubber scale modeler and flyers in the country. I just got back from the contest at Dallas and saw that the FAC news had arrived during my absence. I read with interest the blurb on twin engine stuff. As my 6-25 shows lots of promise, I'll cough up some interesting notes about it. I decided on 8-inch contra-rotating props and backed into the aircraft’s Heinkel HE-112 by Golden Age, reproduction of 21" span Comet model. size. Lo and behold, a 36-inch span, 60 MODEL BUILDER practically half-inch scale! It weighs in at approximately 4 to 5 ounces, which seems reasonable, based on the results. For me, contra-rotating props, three bladed, solved two basic problems; (1) the mechanics of holding the two props with one hand just before launch became very simple, (2) I wanted to retain a lot of the B-25’s characteristic outer wing panel droop. Therefore I decided the contra-rotating props would help with roll stability, which might have been poor with my dihedral set up. Ap­ parently the contra-rotating props have helped, for it seems very stable in this attitude. Also another design criteria which may have helped is a lifting stab. Under the power burst condition with Cessna C-34. Golden Age version of 24” span Megow kit. contra-rotating props, I could picture this thing trying to climb straight up, even with a lot of down thrust. Appar­ ently this seems to help, (or she will climb at a 30° angle for about 5 seconds before starting into a wide right hand turn, rudder warps produced this! I can really vouch for Pres Bruning's differ­ ential down thrust, that is the outboard turning wing forward 2-3 degrees more than the inside wing. I was really surprised at the amount of down thrust required, but as you look at your force arrangements it became ap­ parent: the position of the props with respect to the wing is just like a mono­ Another Golden Age reproduction, the Comet Seversky Fighter, at 22" span. plane with a short nose moment and a shoulder wing. Something like a Mono- coupe or Mr. Mulligan. this flops around very close to the So it looks like twin engines have a lot models CC. Something to be said for not of nose moment, but be careful, this having a twin with tail booms. moment reacts from where the thrust is, One interesting feature came out not the front end of the fuselage. One during trimm ing; I used the scale size obvious bonus though is that the CC trim tabs cut into the trailing edge of the usually comes out quite close to the 30% wing to get the pattern grooved into a range. This helps your overall weight right hand climbing turn and a transition problem, since a very small amount into a right hand glide. seems to be all that is necessary on a B- This has been by far my greatest thrill 25ish type. and challenge in trimming, but as you Also, as you should have guessed, can imagine, it has all been worth the long nacelles are a must, but make sure time and effort. that you do everything to make the most Three loops of 1/8 rubber approxi­ out of the length you have. Mount the mately 20 in. long in each nacelle rear peg as far back as you can get it, and provide more than adequate power keep the removable nose block thin and when cranked to 600/700 turns. the prop shaft short thus maximizing the Believe it or not, she has thermaled internal length of rubber. and really looks neat 100 ft. in the air. lust Incidentally, you can use 2 to 2-1/2 for the Hell of it, guess what my next Mike M idkiff, w ith his B-25 at Ft. Worth times the nacelle length in rubber motor entry w ill be in WW II Combat? Bombs Planesmen Southwestern Champs. More by and you don’t have to braid it, since all Continued on page 78 Mike about B-25 in text. Steve Fauble photo.

SAGE Type II. a Peanut by Maj. Ed Heyn of Norwood MA. Fuselage Ed Heyn is retiring this 24" span 1926 Albatros L-66a from indoor is 13 inches long. competition. Very stable flier.

JANUARY 1982 61 Ceazar Banks releases for flight that assured Ray Harlan, Massachusetts, placed second on Team Trials Contest Director, and 1980 World him first spot on FAI Indoor Team. FAI Indoor Team. Champion, Erv Rodemsky, California. INDOOR TEAM TRIALS By JOSE TELLEZ . , . Under the able direction of Erv Redemsky, a meet was held in September, at Santa Ana, California, to select U.S. representatives to the next world F1D Indoor contest.

• From throughout the U.S., the best public was unfortunate, since rarely is basketball court in action, the place indoor modelers gathered in Santa Ana, there the opportunity to witness such looked quite deserted with the 19 California, on September 5-7, at the outstanding modelers performing in contestants and their associated assis­ large dirigible hangars now part of the El such a unique environment. tants installed in the center of the floor. Toro Marine Corps facility. The hangar used for flying is approxi­ The contestants, totaling 19, were the Because of security and insurance mately 160 feet in height and a couple of cream of competition skimmed out over restrictions on base, little publicity was football fields in length. Although there the last several FAI eliminations held given to the meet, largely curtailing the were a dozen or more large military throughout the country at both local attendance of spectators. This lack of choppers stowed in the hangar, and a and regional meets.

\ » b i Β ΛΙ’Λ Kéi S5ll «Willin' ■litr KS

Dick Richmond, Georgia, boots his model into the air. Placed third Col. Bob Randolph, Ret., California, experienced unusually bad in the FAI Team. luck. Placed 8th.

62 MODEL BUILDER Well, whadya know! It's well known old time modeler Frank Cummings, who came out from Kamiah, Idaho to assist at Team Trials. Larry Parsons at right.

Erv Rodemsky, current world cham­ pion by virtue of taking first place at the 1980 World Championships (held at Just barely enough room! The blimp hangar at the Santa Ana Marine helicopter base. Shot taken Westbaden, Indiana), has an assured slot from m id-point. . . just as much space in the other direction! Height is 160 feet. for the coming 1982 world event and may compete as an individual rather pistons and it ran beautifully when than as part of the U.S. team. With his demonstrated, swinging a wide blade, participation guaranteed, Erv gracefully 14-inch prop. took on the task of managing this Santa When all was said and done, the top Ana meet and produced a fine, smooth place came to a Southern Californian running event. who has been methodically working his One lonely foreigner, Yasutoshi way up the ladder over the past four or Bamba, from Japan, was allowed to fly five years. Ceazar Banks from San Diego during practice sessions. Bamba wanted is thus the No. 1 Draft choice. some high ceiling experience in ad­ Ray Harlan came all the way from vance of next year's World Meet. Massachusetts to become the second A small handful of red blooded old- choice for membership in the USA team. time enthusiasts maneuvered their way Indoor would not be indoor if we did through the admittance arrangements not see the name of Dick Richmond, to witness the event, and we had the who became third draftee for the team. pleasure of meeting Frank Cummings, a Dick is holder of numerous records and true free flight legend now retired and winner of more competitions than we living in Kamiah, Idaho. Lyn Christien- care to enumerate, including 1978 World sen, a top modeler, who has built many Championship; he had traveled all the models for Northrop over the years, way from Georgia to participate in the showed up and let us take a look at his event. latest compressed air engine. The en­ The fourth place winner came from gine has three cylinders made from New Jersey, in the form of jovial and Dan Domina. New Jersey, placed fourth m lipstick tubes! Uses leather seals on the Continued on page 106 the team trials.

Expression on Earl Hoffman's face seems to say his wing wouldn't The complete indoor competitor, represented by Michigan's Ai Doig; fit inside the 63 centimeter limit gauge. model box/winding stand, torque meter. Helium balloon for retrieving. JANUARY 1982 63 Shhh! Master at work. Bob White winds his Mulvihill winner at the Clarence Haught gets advice from Charlie Martin at FAI Semi-Finals. 1981 Nats.

by TOM HUTCHINSON PHOTOS BY AUTHOR Tom Huichnson's now address 20618 S W Loads Cl • It’s hard to believe that I'm starting my personal space to build and store models Aloha. OR 97006 4th year with this column, that this is the nearly brought modelingto a standstill. I 37th month that I’ve sat here looking at a got back into models just before the blank sheet of paper wondering what I 7 979 Nats in Lincoln. The Nats was a great the experts having their doubts that have to say that will keep your interest impetus, even though all I got toseewas a boonie dweller can make it without a until you reach Dirty Dan's column. two hours of Indoor and one Wakefield personal tutor. However, Clarence and I Well, fortunately, this mailbag has come flight late one evening. I’m helping are examples that it can be done. through with a few choice tidbits. Clarence Jelínek, o f Lincoln, catch up After trying my hand at a beginner’s “ EACH ONE TEACH ONE” : Feedback with what I’ve learned. On our second club last year, I found that very few kids I read your "Each One Teach O ne" trip to Mead last Saturday we got his have the desire and dedication to ever article with great interest. It confirms P-30 trimmed. We had a 5:37 flight get past the AM A Cub level. And sure that my ideas/theories about the begin­ which convinced us to start using the enough, you can only handle one, ner problem (or free flighters is pretty DT. A little later, the DT brought her out maybe two kids effectively. close. of another thermal after a minute and a At first, I thought that the passion I I started building balsa models in the half. Talk about elation!!! have for free flight could be easily 4th grade (I’m 27 now) with a Guillow The point I’d like to make is that we transferred to another branch of the Spad. I loved building it, but was very have learned nearly all we know from hobby. I call this the romanticizing of disappointed when it wouldn’t fly. I books, magazines, NFFS Symposiums free flight. What I have learned is that we lived in a little town of 300. My dad knew and correspondence. We haven’t had a free (lighters are a very peculiar breed. nothing about models and didn’t help tutor with us, either at the workbench or There aren’t any great hordes o f kids me. A neighbor had built a Guillow the flying site. We dearly wish we had a who can be converted to free flight Thomas Morse Scout covered with silk resident expert, but we are getting a because of the hard work and dedica­ for display only. I built over a dozen handle on it, if not mastering free flight tion it takes to build the models, gather Guillow kits during the ensuing years, out here in the boonies through written the information about, and accumulate but I had already been convinced that information. the experience required. All this hard rubber scale models couldn’t fly. In the It seems to me that the value o f books work is necessary to get the often- 6th grade, I took up control line. During is drastically underestimated. As compli­ delayed rewards that are garnered at far the six years I was in the Navy, the lack of cated as free flight is, I can understand greater risk than CL or R/C models. The

Tomy timer from Rascal Robot is slowed down to run 2-1/2 minutes Norm Beattie's Wakefield uses Tomy timer mechanism for light DT by press-fitting glass headed pin into ratchet arm. timer. See text. Black scroll is nylon screw. 64 MODEL BUILDER more I learn, the longer the time grows to be that I should consider myself a beginner. The silence of the glide, the graceful flight, the wonder of a thermal, all make it more than worthwhile to me. But that’s awfully rare, isn’t it? My own beginning experiences were very similar to Joe's. I grew up in a small town, too, and began with a 25c Comet Spad. The whole process of constructing a built-up fuselage had me confused until a neighbor showed me to pin the pieces down while letting the glue dry. My first efforts resisted flying, also, so I built plastics until I tried control line. In the meantime, I read everything on models that the school library had, and as many model magazines as I could lay my hands on. A local Optimist club contest introduced me to free flight, and after I was hooked, I managed to join a club of avid enthusiasts with the same experience level. I did have a helpful hobby shop owner who flew with the group every weekend, but most of my free flight experience was gained by reading, reinforced by much trial and error. I certainly didn’t mean to give the impression that I underestimated the worth of the printed word. On the contrary, I have been attempting to call attention to worthy books on the subject of model aviation. But I do feel that some sort of master/apprentice system the illustrations are well-done and would be the most efficient way of detailed. teaching free flight to those beginners This would be a fine Christmas addi­ who want to learn its mysteries. tion to any modeler s bookshelf, if you ONE MORE FOR YOUR BOOKSHELF can find it in your local bookstore. Or Since early spring, I have been search­ you could order it direct from the ing at local bookstores for a copy of Ron publishers ($12.95 for paperback; about Williams’ book, Building and Flying $6 more for hardbound). Indoor Model Airplanes. Not even the DARNED GOOD AIRFOIL Sokolov shops that were part of large chains, Last month, I showed you the Eppler such as Walden's or B. Dalton’s, had it in 61 airfoil, which rates as the best- their list of books carried, and special performing airfoil tested at low Rey­ orders take about 6 to 8 weeks to reach nolds numbers, according to Car­ the far Northwest. I had just about given michael’s paper in the latest NFFS Sym­ up hope of seeing a copy this year when posium. This m onth’s DCA was a close a package arrived from Simon & Schus­ runner-up to the E-61, and might prove ter, the publishers. Thanks to whoever to be even a more practical section for out there sent it to m e. . . I appreciate it. all-around use. This is the kind of book someone out The Sokolov airfoil was the standard in the boonies could use as a textbook Russian A/2 section until they settled on for starting out in indoor models. The the Benedek 6356. The extra thickness content is encyclopedic, beginning with concentrated on the forward portion of a simple rubber model, progressing to the section should make it possible to EZB, Pennyplanes, and the mysteries of make a stout D-box to withstand zoom microfilm. There are also sections on HL launching, while the high camber should glider and scale, as well as details on the give a nice calm-air glide. This airfoil Tom Cashman searches for lift at Harts Lake many pieces of ground support equip­ flunks the "Eppler test” for rear upper semi's. Didn't qualify here, but maxed out at ment necessary for the complete indoor surface dropoff, but the wind tunnel Albany following weekend to earn place in flier. The prose is pedantic at times, but tests show it to be almost as good a finals.

JANUARY 1982 65

1 /2 T.E. X X 3 /1 6 20 LEFT INNER & OUTER PANELS STRAIGHT STAB AREA: 144 sq. in. A/R ; 4:1 (33.5%) FLIGHT PATTERN:RIGHT RIGHT-RIGHT STAB TILT POWER: COX MEDALLION 15 WING AREA: 429 sq. in. A/R : 7.6:1 WASHIN RT. INNERWASHIN PANEL: RT. 5/16OUTER PANEL: 1/8 PROP: REV-UP 8 x 3 COVERING: TISSUE WEIGHT: 15 oz. σ ι σ> MODEL BUILDER they may be over-sensitive to warps, adjustments, etc. Not many can build someone else’s hot design and duplicate the original’s performance. I would not classify the WG 7 as a " hot design", but it is consistent, super stable and reliable. Like its real life counter­ part, it's an all-weather bird . . . as is indicated with a 4-sec. engine run max at 5 p.m. in the rain at the King Orange. The Wild Gooser has been a real "gasser” for me. (Taken from the CIA Informer.) MYSTERY MODEL This month’s M M should be familiar to older Wakefield aficionados, but I’ll run it anyway. For its time, it was a real trend setter, and undoubtedly influ­ enced a later Wakefield winner from the Mike Mayer launches his Twiggy as part of same country. Identification points are class project at Hillsboro High. the built-up, streamlined fuselage, with the twin fins and parasol wing mount. performer, so maybe this “ test” isn't so Would you believe the motor used 13 significant (the great majority of DCA’s strands of 1/4 inch Pirelli? used today successfully do pass the test, If you think you have the identifica­ however). tion of this ‘golden oldie’, send in your MODEL OF THE MONTH guess to the Model Builder office (621 Jim Walston’s “ Wild Gooser” A Gas W. 19th, Costa Mesa, CA) to see if you’ve Darrityn Faugn with her pink Twiggy. Did seven minutes outdoors, holds class record. A few years back I did some musing won the free subscription. about the possibility of using cheap, Time for another Mystery Model lightweight engines rather than the winner update. Here's that name again! Steve Landy, snarly Schneurles, in order to achieve a Among those who correctly guessed who won June’s M /M contest, was also better power-to-weight ratio. This "Fatso" as the May '87 Mystery Model, firstest with the mostest on September's month’s 3-view is by somebody who was a fellow by the name of Lloyd Hunt, M/M, the "Upstart", by Art Phillips. As tried this approach. of San Diego. Actually, he didn’t guess, he’s pretty well fixed with a subscription, The WG 7 is sort of off-the-beaten- because he designed Fatso, however, his we’re sending Steve an Uber Skiver path as far as current FF designs go. The answer didn't get in as soon as the one knife set this time. proportions and moments are rather from Phil Oestricher, of Fort Worth, October's Mystery Model, the "Sky­ conventional and the construction is Texas. As Phil is up to his neck in Model lark", was first identified by Earl Purkey, simple and straightforward. The big Builder subscriptions, his prize is an of Maryville, Tennessee. Designer was difference is that it looks different. The Uber Skiver knife set. Peter Franklin. fuselage is underslung to increase the Steve Landy, Newton Centre, Massa­ Talk about good timing! Rudy Klui- lateral area and the 3-fin configuration chusetts, was one of only two who sent ber’s subscription to MB is due to run increases the rudder area above the in answers to the June '87 M ystery out in January ’82, so his first correct norm. These items seem to give the WG Model, Walt Schroder’s "Super Stuff", answer to the November ‘81 M /M will 7 great stability in the wind and a superb thus winning a subscription. keep the mag coming to his address in transition from power to glide without Non-subscriber Louis joyner, of Bir­ Lakewood, Ohio for another year. Oh auto surfaces. Most importantly, a rela­ mingham, Alabama, is now a subscriber, yes, it was Phil Kraft's Hi-Fli, originally tively inexpensive .75 powerplant can as his was the first correct answer (by published in April '56 M.A.N. give surprising performance. postmark) to the July '87 M /M , Gary Just for the heck of it, and because it The current trend seems to be to use Christiansen’s "Royono”. will be too late to help, we’ll point out the most powerful "throbber” and Bill Winter’s “ W OG" brought lots of that the December Mystery Model is design a super-screamer around it. response, as the August Mystery Model. Paul Palanek's “DriftwoodWonder Sometimes, the results are, o f course, And another new subscriber now joins who'll tell us about it first. . .? phenomenal. However, sometimes the the ranks. . . Frank Lee, of Flushing, New A TALE OF TWIGGYS reliability o f such designs is low because York. When school began this fall, the new

"Vou wont height?* Make airplane smaller. Ron Rodgers and Chris Oljzencezak wind up a Twiggy for class Vou want glide p Make airplane pigger.... science experiment. They had a four-minute flight! JANUARY 1982 67 best-flying models for a mass launch to see who was top dog. The result was as thrilling a flyoff as you’d want to see. A model with 2mm rubber chugged up slowly, while the feminine entry zoomed ^Bes^ W ishes ··· up with 3mm rubber, finally being passed by the slower climber on the way down. When the 2mm powered model landed, with a new record of 1:35, I 3 oy anďneace> thought it was all over, but the "Pink Lady’’ built by Darrilyn Faughn had managed to snag and hold an honest-to- Tl\is I (pliday §easor\J goodness thermal and was going up again. It drifted over to the cafeteria area, closely pursued by half the class, and landed in 3:37. Naturally, this grated on the collective male ego of the rest of the class, and there was much cheering the next day when the record was pushed up with a — < £ · / 4:01 flight by Ron and Chris' model. Undaunted, Darrilyn wound up again and found another nice thermal. After a couple of minutes, it was obvious that we had another record flight, and it drifted off the field and landed in a nearby nursery after a spectacular 7:00 flight! So, some of you are probably wonder­ ing if there was any educational value in all this. I did too, until I realized that the class had learned to do something that they’d never done before, and per- servered with it until they achieved some success (and some of them had HB-ENGINES never had much success at school, either). And I suspect that most of the BAVARIAN PRECISION PRODUCTS CO. · P O Box 6. New Canaan Connecticut 06840 class will remember the 7-minute flight of Darrilyn’s “ Pink Lady” a lot longer than anything else taught in the class. All set about building Clarence Mather's in all, it was a glorious way to start the Twiggy design . . . the experiment was to school year. see whether we got the best duration on P.S.: Bill N .. . . does this win Hillsboro HB 2mm or 3mm rubber. High a Model Builder subscription? Let About four class sessions were neces­ me know, and I’ll alert our librarian. The sary to make sure that each lab team of class is really anxious to see their pic­ two builder/fliers had the work com­ tures in a real NATIONAL magazine! Hot lin e pleted. First trimming flights showed (You bet it wins a subscription! Andto that all of the models were flyable, but any other school-connected reader, this (203) 74a 7320 some were more flyable than others (the is the kind of extracurricular activity we Twiggy is much more suited for a be­ referred to in our August '81 Work­ ginner than the AMA Cub, since it has a bench offer regarding teaching of avia­ Hours: 4PM to 10PM (EST) natural power pattern as built, requiring tion and/or modeling, wen) only thrust and CC adjustments for ideal TOMY TIMERS FOR FREE FLIGHT flights). I’ve received several inquiries for DRAPER'S R/C SERVICE I let the class struggle with hand­ more information on the modified toy 10 Castle Hill Drive winding for about 20 minutes before timers used for DT by several filers in the introducing stretch-winding with a Seattle area, so I thought I’d oblige this Bethel. CT. 06801 rubber winder. For my first example, I month with some pictures and further chose the model being flown by a descriptions. textbook I'd ordered for my Physical couple of girls in the class. About 500 The timers used mostly are made by Science class hadn’t arrived,so I decided winds with a bit of good air produced a Tomy toys to power their "Rascal Robot” to start out the year by having the class 57 second flight, roughly double the (#2517) and Acrobot (#2521) walking building and flying models (I did this at best previous flights. It didn’t take the figures. Inside the figures is a cheap, the end of the last school year, but our kids very long to realize that when you reliable, light mechanism that can be Oregon weather was too wet and windy flew was as significant as how well the easily adapted for either DT or engine to do much flying in June). The idea was model flew. By the end of the first period tim er use. to introduce my class of 11th and 12th you could see them winding up and First step is to break the figure apart graders to a scientific method of experi­ waiting for “ good” air like experienced (you’re allowed to wind it up a few times mentation, and I couldn’t think of a Wakefield fliers (even though a half and play with it for a while first) and better vehicle than a model airplane (the hour before, they had to be reminded to extract the mechanism. In its stock form, fact that the flying weather was ab­ launch into the wind). the timer will run for about 20 to 25 solutely perfect this fall wastheclincher). By the end of the 2nd flying session, seconds, and can be used as an engine We started out by building and flying there were several well-trimmed timer (Gil Morris used one of these on paper gliders and comparing the per­ models, on different rubber combina­ his Nats-winning 1/2A Matchsticks this formance of two different designs. tions, with times pushing near the year). Such a timer will be very light­ Then, once the mood had been set, we minute barrier. Finally, I got the three weight . . . about 3 grams for tne me- 68 MODEL BUILDER Authentic 1/5 Scale BYRON v \ ORIGINALS r f

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An extremely handy device when attempt to improve on the performance Catalog - S1.00 installing your system in a new airplane. of its predecessor. I wish I could take you Master Charge and VISA through the entire history of this syn­ JIM CROCKET REPLICAS Dealer Inquiries Invited P.O. BOX 12600 ELECTRONIC MODEL SYSTEMS thesis, but simply to illustrate, let Karl 6175 Palo Alto Dr., Anaheim, CA 92807 speak for himself. FRESNO. CA 93778 The Bone design aims at greater chanism and the same amount for the a choice of two shafts in each me­ stability by means of a low center of faceplate and mount (if made from chanism. You can cut off the one you're gravity (a long moment arm to the ballast brass). not using, or you can let it protrude out at the end of the keel). A keel of much For DT use, the mechanism must be the other side of the fuselage for a greater span than conventional designs slowed down, by weighting the ratchet winding handle). To ease the strain on can have the same area by using a escapement arm. (The Acrobot and the mechanism, you might want to relatively short chord and, incidentally, Rascal Robot mechanism have a thicker install a leverarmsothatthereismoreof a corresponding reduction in thickness. arm, which makes this step easier.) I a mechanical advantage to the DT For example, the keel of a conventional have found that inserting a glass-headed action, as shown in the photo of Norm hull compares with a recent Bone keel as map pin into this arm will result in an Beattie’s Wakefield. follows: extended run of about 2-1/2 minutes. TERMS EVERY COMPETITIVE MODELER This is long enough for Coupe and HLG SHOULD BE FAMILIAR WITH Conventional Bone ... for slower running, substitute an (From the November newsletter, Span 9 Inch 18 Inch L-shaped weight bent from a straight pin Ted Rogers, editor) Chord 6 Inch 3 Inch and trimmed until you get about three PRESSURE SYSTEM: A m ethod used Thickness 0.5 Inch 0.25 Inch minutes of run (I managed to get about by many modelers, whereas construc­ four minutes this way, but it didn’t seem tion of a model is started as close as The smaller Bone keel cross section is to run fast enough to be reliable). The possible to a contest date so as to finish nice hydrodynamically, but suffers in its escapement weight can be press-fitted the model at 3 a.m. in the morning of the ability to resist bending. The "section into the nylon arm, with a drop of Hot contest. modulus" indication of strength in­ Stuff added. The hole can be drilled with TIMER: A mental clock that allows the volves thickness to the third power, thus a small drill/pin vise or a heated pin. modeler to determine the length of the a foil with 1/2 the thickness has 1/8 the The faceplate can be made from 1/32 PRESSURE SYSTEM. stiffness o f a thicker fo il (1/2 raised to the plywood, Hot Stuffed to the flanges on PACIFIER: A large glass o f Scotch third power). the side of the mechanism. On/off consumed after a contest to help forget The problem becomes even more switch can be a pin fitted to interrupt the three crashed and two lost models. difficult with a significant mass mounted ratchet, or something more elegant. The LANDING SKID: What the modeler at the tip of the keel foil. The natural scroll that the DT loop runs in can be does, after falling down a flight of stairs, frequencies in both bending and twist­ made by winding a piece of soft wire in a from too many Pacifiers. ing are quite low, lying within the range helix around a piece of brass tube and SCHNEURLE PORT: PACIFIER pre­ where the keel can resonate when Hot Stuffing it in place. An even better ferred by Max Schneurle, modeler and excited by the forces encountered in solution is to press-fit a nylon screw to wino. normal sailing. In fact, the early Bone the shaft (say 1/4-20, available at your COUPE: Size of car driven by modeler thin keels suffered from such flutter local hobby shop), making sure that you who only builds 1/2A's. problems at high speed. On a reach or choose a shaft that is rotating clockwise, WAKEFIELD: An outdoor place, where run, the boats having these keels under­ so the DT loop screws out as the timer services are held for departed models. went violent oscillations as the keel runs, rather than the opposite (you have NORDIC: Olga Swenson . . . 5 '9 ". . . whipped back and forth. The result was a 70 MODEL BUILDER 70GPLS180—PLS-180 Servo $46.75 If you have been wondering where 70GPLS15III—PLS-15-III Servo 46.75 70GPLSI—PLS-1 Servo 46.75 you could get Pro Line replacement 70GPLS21—PLS-21 Servo 46.75 70GPLS14II—PLS-14II Servo 46.75 batteries, servos, and receivers, won­ 70GPL550—550 MAH Battery 24.96 der no more. Production is rolling 70GPL500—500 MAH Battery 21.96 70GPL225—225 MAH Battery 21.96 on these as well as many other ac­ 70GPLCR—5 Ch. Challenger Rx 84.00 70GPLR5—5 Ch. Competition Rx 111.00 cessories and spare parts. Send a 70GPLR7—7 Ch. 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large increase in drag and less speed. reinforcement should be aligned with tension. Just after c rip p lin g , several This flutter problem put the entire these forces, that is, the strands of fiber diagonal buckles appear. Then there is a development of long keels in jeopardy; should run spanwise for bending and mighty snap and one large tension therefore a special effort went into diagonally to counteract the torsion. buckle forms on the main diagonal. making the stiffest possible keels. The fibers intended to resist the more With still force applied, there is a ripping To ensure accurate shape, special severe of these loads is placed farthest noise, and the shear web fails in tension matched metal molds were machined outboard, that is, nearest to the skin (in along the opposing diagonal. from solid aluminum. These were cut to that this provides greatest leverage). In O.K. So you don’t want a balsa web the exact foil section. This allowed the practice, the layers may be alternated or even to cripple. The thing that brings on layup of keels with the reinforcement doubled before alternation. Obviously, crippling is an elastic compression close to the outer skin, since virtually various materials can be used. An out­ yielding across two of the corners. Thus no allowance is needed for sanding and side skin of very light cloth allows a nice the ideal arrangement is to align the fairing. Placing the reinforcement mate­ finish. grain of the shear web so that it offers rial as far outboard as possible greatly Measurements clearly show the effect the maximum compressive stiff ness, that improves the stiffness. If the reinforce­ of different arrangements of the keel is, from the lower left to the upper right, ment is a mere 0.0Ί inches further laminates. The best layup actually cuts if the tip is toward the left. Of course, if outboard (by virtue of an adequate mold the bending from five to about two you expect your aircraft to spend out of and no gel-coat being used), the contri­ inches, and the twist from seven to one its useful life inverted, then the grain bution to stiffness of a thin keel w ill degree. Note that the double drag with should run along the opposite diagonal. increase by almost 40 percent. shear strips produced a negative twist, (Ben Shereshaw seems to have been The original Bone keels were so that is, effectively moved the center of aware of this many years ago. Most of his flexible that a twist of seven degrees and gravity outside of the foil." This is a big, beautiful free flight designsfeatured lateral deflection of five inches would rather remarkable result, one having wings with top and bottom flat spars result if the boat was held horizontal. important implications for R/C sailplane using diagonal bracing criss-crossing We built a special test rig to evaluate the wing design. between the spars in all rib bays, wen) more complex layups required (o cut In a recent issue I asked whether the If you have closely spaced ribs so that down these deflections. Here the keel grain in the shear web should be vertical the "aspect ratio” of each shear web is section is mounted in a horizontal or horizontal. This brought forth an near unity, then the angle between the attitude while a special loading device 18-page dissertion from Jack Fletcher, diagonals of the panels and the stiffest applies bending and twisting force to of Lexington, Massachusetts. I wish I grain direction is the same (about 45 simulate the load that would be imposed could present all of his reasoning in degrees). In other words, (or square by the ballast. Various lamination detail, but instead, let me summarize panels, it doesn’t matter whether the schemes were evaluated, each being his view. A steel cantilever beam having grain is vertical or horizontal. If, how­ measured under a range of applied an upward force at the tip end will ever, you use wider spacingbetween the bending and twisting loads. buckle along diagonal lines that descend ribs (a wider aspect ratio for the shear The forces experienced by a keel are from the tip to the lower portions of the web), horizontal grain is more nearly of two distinct types, lateral bendingand supporting structure. If you really keep aligned with the longer diagonals along torsion (twist). To counteract these, the on piling up the load, the web fails in which the compression forces operate. JANUARY 1982 71 THE FIFTH ANNUAL CONSUMER TRADE SHOW JANUARY 9 & 10,1982 Pasadena Center, Pasadena, California SPECIALIZING IN RADIO CONTROL SEE THE LATEST PRODUCTS AND VISIT WITH MAJOR MANUFACTURERS AND DISTRIBUTORS t=i FOOTHILL FWY. 210 MODEL AIRCRAFT · MODEL ENGINES MODEL BOATS · RADIO CONTROL SYSTEMS MODEL CARS · MODELING ACCESSORIES ΦΖΖ77ΖΖΖ77ΖΖ7. FULLY ASSEMBLED ULTRALIGHTS H Ž ss 2 H 'a (POWERED HANG GLIDERS) ON DISPLAY

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Jack goes on to point out the im por­ CA 95129. What fine organization! But. what’s tance of strongly connecting the shear Jim indicates the desirability or using wrong with the rules! web to the surrounding members. "To wide spars in the wing (called flanges). For my money, the great unsung make these shear web inserts work there Further, the upper flange should be heroes of the whole meet were the has to be good shear connections to the thicker than the lower one because it is Peruvians. Their valiant attempt to beam caps and through the rib material mostly in compression rather than compete by using manual powered to the shear web on the other side of the tension. "This is especially true with the launches when all the opposition were rib. In most light rubber models the usual covered framework construction, using electric winches is to be com­ beams are not connected with the shear because the bottom covering will share mended. This points up a major flaw in web. But, this leaves a lot of lost oppor­ some of the tension forces while the the rules. Apparently the rules even tunity since the strength and stiffness of upper covering is useless in compres­ penalize human powered launches, a beam varies as the square o f its depth. sion." something about shorter length lines. You want to take advantage of the Jim then discusses shear webbing. It seems to me that one of the beau­ vertical distance between the beams." "W ood is considerably stronger in shear ties o f R/C soaring is the attempt to fly He suggests using doped tissue, silk, or perpendicular to the grain and . . . without motorized assistance. So. I vote nylon fabric to make torsional shear modelers often put the grain of shear for a rule change that would at least webs even in a lightweight wing. "These webbing vertical in the belief that this is allow manual launch to compete favor­ have no compressive strengths. What stronger. But since the shear load in a ably. if not at an advantage. I’ll wager you want to use is the great diagonal beam is equal in both horizontal and that most of those who object to a tension strength. Build the wing section vertical directions, vertical grain shear change like this are those too fat to run with two individual beams, then flex it to webbing is little better than horizontal 50 meters. get an impression of the overall wing grain shear webbing except for dif­ Another argument in favor of a change stiffness. Then glue in tissue webs, dope ferences in the shear taken up by the in rules can be seen when you look at them, then try flexing the wings. You w ill flanges. Perhaps the grain might be put the times in the speed runs. By 7983, the be astounded!" at an angle to equalize the shear strength Canadians will have perfected their Jim Thornbery, of Rochester, Min­ in both directions. .. He goes on to launch directly onto the course with nesota, also comments on my shear stress the importance of the glue joints their 36-volt winch and will be at least web question and sends a copy of his and other aspects of wing construction two seconds faster than anybody else. paper entitled. Higher Strength/ and joining. At this point all I can say is, Contests will become " Hardware Wars" Weight Wing Spars that appears in the designing a light, tough wing is indeed . . . who has the strongest winch? What Proceedings of the thirteenth annual a complex task. do you thinkf symposium of the National Free Flight And let me share a letter from Ed See you next month. · Society, 1980. You can obtain a copy of Karns of Cotati, California. these Proceedings and other worth­ The International FAI AMA R/C Soar­ while publications of the National Free ing Meet in Sacramento was a thrill! JR Radio.... Continued from page 25 Flight Society, by writing to Fred Ter- What fantastic airplanes! What in­ switches are labeled "ELE/FLAP” , and zian, 4858 Moorpark Avenue, San Jose, credible piloting! What great weather! "SPOILER 2-1” ; the knob is labeled JANUARY 1982 73 Circus Hobbies, I found that this is a CANNON FDIRST OBT) special lubricant which, in addition to R/C SYSTEMS making things work smoother, acts as a I 7 moisture barrier. It turns out that nylon is hygroscopic and swells when it ab­ WORLD’S SUPER-MICRO! sorbs moisture, and this must be pre­ SMALLEST SERVO, Rx & COMPLETE R/C SYSTEM vented in this servo because of the tight gear tolerances. A W -f SUPER-MICRO Servo, .47 oz., 29/64 x 31/32 The bottom line is . . . Don’t clean or P g X 1-3/32", 15oz.-in. thrust. Works with most lubricate the gears! This, together with _ oil positive pulse decoders. MICRO Rx (4 CH. the difficulty of removing the motor and max.), 19/32 X 7/8 x 1-9/16“ , weight .54 oz. electronics, suggests that it would be (2 CH .) (5 CH . uses larger MINI Rx). Flite best to leave the maintenance and repair packs compatible with Tx of most other makes. of this servo to the factory or an author­ ITEM SYSTEMS FLITE PACKS ized repair facility. I guess this is the price we pay for protection. . . the more 2 CH. $234.95 $169.95 (2.9 oz.) sophisticated our equipment becomes, 3 CH. 292.95 2 0 7.50 (3.39 oz.) the less of its maintenance and repair we are going to be able to do ourselves. The 4 CH. 349.95 244.95 (3.88oz.) electronics is contained on a two-sided 5 CH. 359.95 247.95 (4.16oz.) epoxy-glass circuit board, and the heart of the servo is a proprietary J.R. inte­ ‘ SERVO$47.50 micro rx$89.95(4CH.) grated circuit. I found the dead band of ‘Micro or Dean's plug; others $2.50 extra. all four servos to be less than 3 usee, SHIPPING: Systems - $6.50; Flite Packs - $4.50; Servos or which is less than half of the 7 usee Rx-S3.00. 20% deposit required on C .O .D. orders. Colif. typical of most servos. Even with this residents add sales tax. Brochure - .50U.S., $1.50 Foreign . tight deadband, only one channel ex­ hibited an occasional glitching which 13400-26 Soticoy S ire·! North H olly wood, Colif. 91605 Phon· (213) 764-1488 could be heard if I held the servo to my ear, but could not be detected by any "AUX 1" With the “ ELE/FLAP” switch in screws and the assembly is designed so movement of the output shaft.. The the elevator position, the elevator the antenna is provided a good strain servo idle current is low-ranging, from 4 control is mixed into the auxiliary I relief by being trapped between the to 5 mA, for the four servos. Operating channel, with the auxiliary I servo travel case top and bottom. current ran about 200 mA if the control adjustable from 0% to 100% of the The receiver, which requires only was rapidly and continuously moved elevator servo travel depending on the 7-1/2 mA to operate, has a double- back and forth. Servo centering was setting of the "AUX I” knob. In low rate tuned input and a tuned RF amplifier. All excellent, with mechanical slop ranging elevator the low rate adjustment also of the RF coils and transformers on the from 0° (that’s right — ZERO) to less than adjusts the auxiliary channel, but the board are contained in metal cans for 1/4°. In all cases, with both slow and fast elevator trim only affects the elevator shielding. Otherwise, the receiver ap­ operation, and from either direction, channel. pears to be of conventional design, with centering error was less than 1/4°. Regardless of the position of the three IF’sand a singledecoder. Icouldn’t One interesting feature of this servo is "ELE/FLAP" switch, the spoiler 2.1 tell what kind of IC is being used that the sealed pot cannot be rotated for control moves the auxiliary II servo to because an enormous 470 uF capacitor is centering adjustment. The only means one of three set positions of 45° ccw, 17° mounted directly on top of it. I think JR of centering the output is by moving the ccw or 36° cw. When the “ ELE/FLAP” Radio is trying for the world record for output arm on the splined output shaft. switch is in the flap position, the auxiliary the largest capacitor ever to be used in This provides for adjustment only in 15° I servo is decoupled from the elevator an RC receiver. increments. There is a fairly wide varia­ and coupled to the "SPOILER 2-1" THE SERVOS tion in electronic centering from servo switch and is switched to one of th ree set This system is supplied with NES 101 to servo, and I found that on a given positions of 38° ccw, 25° ccw or center. servos, which feature a ball-bearing channel, with all trims centered, the best The bells and whistles seemed con­ supported output shaft, sealed carbon center attainable using the output shaft, fusing at first, but really didn’t take too pots and carbon button pot wipers. In ranged from 1° to 4-1/2°. This could be a long to figure out. The one thing I think addition, the servo is protected from the problem for competition fliers, should it is missing, however, is a continuously elements by O-ring seals on the case top Decome necessary to change a servo variable auxiliary channel to be used for and bottom and on the output shelf, and between flights, as it would be impos­ a carburetor mixture control. Also, the a molded rubber strain relief on the sible to get everything set exactly the close proximity of the retract switch to cable exit. The system is supplied with same unless the transmitter was avail­ the aileron dual rate is such that it is multi-directional servos with the direc­ able, since that is where the only fine likely that we’ll be seeing some people tion of rotation indicated by the color of adjustment is. putting their gear down at strange times. the label. The servo weighs 1-5/8 oz. and BATTERY PACK CHARGER THE RECEIVER measures 2-1/8 x 3/4 and 1-3/4 inches AND SWITCH HARNESS The NER 227 is a seven-channel re­ high, including the bearing housing and The airborne battery pack is com­ ceiver which also includes an input for a output shaft. posed of four 500 MAH cells arranged direct servo controller (D-S-C), which On disassembly, I found that nothing side-by-side. An interesting point is that allows you to operate the system w ith­ was left to chance on the inside of the the pack is not enclosed in a case, but is out the transmitter. The receiver is servo. The board and wires were care­ only held together by heat-shrink plastic housed in a molded plastic case which fully placed, and everything was held in wrap in order to save on size and weight. measures approximately 1-5/8 x 2-3/4 x place with glue, including the motor, I’ve heard of masters fliers removing the 1-3/4 inches. which I was unable to remove for fear of cases from their batteries to meet strict The connector housings are molded breaking something. The output gears FAI weight requirements, but for most into the case and are keyed to prevent are of very heavy construction, and I was competition I can’t see where a 1/4 oz. the plugs from being inserted back­ surprised to find that they appeared to of plastic can make much difference in wards. The connector pins are soldered be well lubricated, as I had just read the the performance of a seven to ten- directly to the circuit board and each instruction manual which had clearly pound airplane. On the other hand, the channel is clearly labeled on the case. stated that the gears were not to be absence of a case leaves the least reliable The case bottom is held on by four lubricated. In my conversations with component of the airborne system 74 MODEL BUILDER This is a great scale model of the new 150' a husky steam engine, if desired. ocean going tug built by Harter Marine, Inc., Dumas hasa running hardware kit (#2340) and used to tow big offshore oil drilling rigs. which includes two 4 " diameter, four-bladed Thisnew 'Mr. Darby' model(#1217)is47" bronze propellers, stuffing boxes, shafts and long and has a beam of 12". The finely detailed miscellaneous other needed parts. hull is fiberglass and the decks and super­ Remember, if you're into electric powered structure are cleanly die cut plywood. There is models, Dumas also has motors, gears, speed plentyofroominthehugehull.spaciouscabins controls and even 6 volt, 5 Amp. hr. sealed lead and wheelhouse. They can accommodate vir­ acid battery packs. tually any type of detailing, radio equipment, Seeyourlocal hobby dealer, today! If you'd batteries,sound units, etc. thatyoucan imagine. like a complete Dumas catalog, please send A new, complete Dumas deck hardware kit $1.00 to cover postage and handling. is included, and has been created to make your "Mr. Darby" a top ranking scale model with its finely detailed parts. Although primarily designed for twin elec­ tric motor power, "Mr. Darby" can easily handle d u m a s The Model Boat People * n m Dumas Products. Inc., 909- J East 17th Street, Tucson, Arizona 85719

A Big RC Scale Model by DUMAS BOATS

JANUARY 1982 75 advantage if you had 5 usee of jitter in for HEA VY or LIGHT JOBS the pulse from your transmitter.) The Cuts most anything — metal, wood, plastic, etc. 7C-4SF system is distributed by Circus Comfortable Hobbies Inc., 3132 S. Highland Dr., Las grip • Recessed nose— Vegas, NV 89513. On the bench, this for use in normally appears to be an excellent system which hard-to-reach places should give years of reliable service. Watch for a report on flight performance testing in a near future issue of M odel Builder. ·

R/C Auto . . . Continued from page 47 is finally here, but carrying the Panther label. If the car looks familiar to you, it • Compact—easy to store in tool box or drawer. should, as the proven JoMac Lightning 2000 chassis is used as the basis for this APPLIED DESIGN CORP. · 738 Penn Street · El Segundo, CA 90245 car. Front end, pan, rear pod, servo saver, and wing tubes are all JoMac vulnerable to damage especially during SERVO REVERSER pieces, dyed black instead of blue. radio installation. I would much prefer The NEA 500 Reverse Amplifier, which Wheels and rubber are from Parma, are to see the pack supplied in a case, measures approximately 1-1/4 x 3/4 x quite light and dyed yellow. leaving it to the discretion of the flier to 1/2 inch, can be plugged in the line At the back end a slightly modified remove it if he really needs to. A slow between any receiver channel and its Associated ball diff is used, definitely a rate charger is supplied which has LED servo to reverse the direction of rotation good move, as their piece is still the charge indicators for both the receiver of that servo. The unit by itself requires smoothest, most effective diff available and transmitter. I felt that the cords were about 6 mA to operate, and in use I for 1/12 cars. The diff is modified by use a bit on the short side, with 27 inches found that the evaluation unit changed of a spool on the right side of the car, this provided for the receiver and 34 inches the servo centering by 5°, reduced the spool replacing the usual spacer. An for the transmitter. ccw travel by 2° and increased the cw advantage here is that the wheels can be The switch harness consists of the travel by 4°. Centering accuracy and removed without disturbing the setting switch with a plastic protective housing, stability of the servo were not affected. on the diff, and it is also a little easier to battery and receiver connectors, and a SYSTEM PERFORMANCE swap rear tires from side to side. charge connector with a removable The airborne system current drain The radio tray is cleanly cut from glass fuselage adapter. All of the wiring for averages about 250 mA under flight and fits right on without a bunch of whit­ the system is made up of three-conduc­ conditions and functions normally with tling, but I have to wonder why Parma tor flat cable. This was used even for the no servo centering change or jitter, with elected to mount 3-stick batteries Asso­ battery and switch harness even though battery voltages variations from 3.2 volts ciated-style, instead of 3 cells to a side, only two wires are required here. This to over 6 volts, which provides a good like the Lightning car. Actually that is was done mainly to save on system cost margin for one-cell-out capability. I also probably the reason right there, this since its cheaper to buy large quantities found it to have excellent immunity to arrangement selected to keep the of one type of wire than it is to buy abrupt voltage transients, as might be Panther from looking too much like the smaller quantities of several types of encountered with a failing servo motor Lightning. But this also means mounting wire. This provides another good bene­ or a binding control surface. the Rx up high, picking up Associated’s fit, however, since having the extra wire I feel that the overall performance of old problem of trying to find a body that will provide some additional strain relief this system is excellent. The individual will mount low and not interfere with for the other wires, thus prolonging the components perform well and on a the Rx. Fortunately, there are a couple of life and improving the reliability of the system level they play well together. (A 3 alternatives. You can cut a different tray, harness. usee deadband in a servo would be of no packing all the stuff underneath itsome-

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76 MODEL BUILDER place, pick up on a standard Lightning 2000 tray or, for Can-Am bodies that work and still fit, use the TOJ's, one each available from Associated and MRP, or use the )oMac Schkee body, a number NEW RELEASE! that is real clean, works on the track, and fits most any chassis around. Dynamic New Flying Machine BoLINK HUFFS ’N PUFFS... You may have already heard, but We at Orange Coast Hobbies have had have been offered in the past only on high BoLink has been doing some wind- hands-on experience with almost every brand performance, contest type models which tunnel testing of its bodies, currently of model helicopter on the market. We have carry a heavy price tag and require hours of furnishing a copy of the test results with been providing technical assistance to heli­ building and hours of maintenance with ex­ each body on which tests have been copter modelers in southern California for pensive replacement parts. completed. Must admit that I was plenty the last five years and have built a reputation The HUGHES 300 retails for only skeptical about this, having a fair under­ of giving sound advice and offering techni­ $295.00 and requires only that you assem­ standing of what is involved in designing cal know-how on every major model brand ble the tail boom to the main frames and in­ the wind-tunnel to give accurate and that has come onto the U.S. market. stall the main and tail rotor blades and repeatable results. However, I have seen Over the last four years we have seen the flybar. All of the linkage on the collective several of the new bodies and the wind- state of the art of model helicopter engineer­ Bell/Hiller head is done for you at the fac­ tunnel report for each recently and ing advance to the point that the average tory and our easy to follow instructions will while there were no real surprises, I modeler can now buy a model helicopter off help you install your engine and radio and guess that sorta confirms that the tests the shelf and know that it will fly once proper­ be ready to fly in one evening. There are no relate well to real-world experiences, ly set up. This is as it should be, and advances wood parts to cut out and paint, the canopy although I would still like to see pictures are still being made to further improve the is molded in colored plastic and requires of a typical set-up for testing. For performance of these rotary winged aircraft. only a little pinstriping. New rotor blade instance, are they testing just the body, it Orange Coast Hobbies has exciting news. design and a revolutionary new blade cover­ being supported by posts in the floor of We have found in Japan a helicopter ing eliminate the need for glassing the blade the wind-tunnel, or is there a complete manufacturer that has something new to of­ hub which is required on all other collective car under the shell? Would seem to me fer the helicopter modeler. We have done pitch models — a messy and tedious task. to make a huge difference in test results, extensive testing of this new product and The features and advantages of this new and as Bob Rule is reading this, maybe have decided to import it to the U.S. This HUGHES 300 go on and on. If you have he will snap some pics (black and white decision was not hard to make after flying a been looking for something new in a model only, Bob) for us. model that looks like a real helicopter in the helicopter, if you want a model that looks Still, as mentioned, many of the results air, flies as smooth as anything we have and flies like the real thing, if you want to be ever flown, comes assembled from the fac­ able to get good technical assistance when do sound familiar, matchingexperiences tory (with engine if you want it) and is the you need it, if you want replacement parts gained from years of cut-and-try experi­ easiest model to set up and fly that we have at a reasonable price, if you want “sudden mentation. And there is the value for seen to date. This model comes to us in the service.” then you want the new HUGHES you guys who aren’t so experienced. form of a HUGHES 300, with features that 300 from Orange Coast Hobbies. Next time you need a body, take a look at what BoLink has to offer, go over the wind-tunnel test very carefully, set your car up to match a combination listed, drive it a couple of times and then go back and set it up to match another combination. Do this a couple of times, being very critical of results, and you can pick up a ton of experience quite quickly. NEW K&B .21 FOR CARS... $2 9 5 00 It is tempting to say that K&B finally $40500 with OS50 took the car folk seriously, giving its FSR engine installed already-popular .21 an up-date in design, an up-date that it was very much in need SPECIFICATIONS Rotor Span: 54" of as the old engine was suffering in Length: 45” comparison to .21 s from OPS, Picco and Tail Rotor Span: 12” others. It is tempting to say that, as it has Height: 21" certainly looked, from the car racer’s Weight: 9 lbs. 4 oz. point of view, as if our needs in a car Engine: 4 5 /5 0 FSR motor were simply not being met by our or equivalent only U.S.-based manufacturer, even Trainer/Sport Scale though the guys at K&B might disagree with that. FEATURES: But that is history, K&B finally has a • Semi Knock Down Kit • Unique New Blade Covering motor designed just for RC cars, com­ • Collective-Bell/Hiller Head (assembled) • Shaft Driven Tail Rotor plete with machined heat-sink head, • No Wood Parts • Easy Radio Installation thicker cylinder liner, beefed-up main • Canopy & Fins Molded in Color • Stable Tail Rotor (no mixing or gyro needed) block, cross-drilled screws (for safety • Shaft Starting • Rugged Construction wire) holding the front and rear plates to • New Flybar Paddle Design, • Smooth, Scale-like Performance the main block and, most importantly, Patent Pending • Comprehensive, Easy-to-Follow Instruc its own main bearing that looks to be • New Blade Construction tion Manual bullet-proof. This bearing has been a ’ Auto rotation clutch assembly available separately. Full line of replacement parts available. constant source of trouble in the past, at least until a couple years ago, when ORANGE COAST HOBBIES MAIL ORDER somebody figured out how to make full- 14536 Brookhurst Street (at Hazard) Dept. Μ. P.O. Box 1931 compliment bearings. Now K&B has its Westminster, CA 92683 Garden Grove, CA 92642-1931 own solution to the problem, a bearing (714) 531-8403 Add $5.00 shipping/handling that has a molded retainer and it looks V JANUARY 1982 77 channel radio for basic controls, but a 5 or 6 is better so that you can also control water ballast and helium release. T h e LAUGHING WHALE The Pony sells for $249, or for those of you who want to design yourown blimp, introduces the the helium envelope is available by itself for $129. Peck-Polymers, Box 2498, La Fantail Launch complete with Mesa, CA 92041. Golden Age Reproductions has just the Saito OE1/OB1 steam engine released two scale models that ought to knock your socks off. One is a 25 inch span Boulton Paul Defiant that has a canopv-turret vacuum formed along with the wheels. The other is a 22-1/2 inch span P-35 Seversky Pusuit from an old MEGOW plan, which has been modified for more scale detail. The Heinkel HE 112 and Cessna C-34 are former releases. All these beautiful models were built and photographed by Bob (?) Schlosberg, of Weston, MA. No prices were given for any of the men­ tioned kits. (See ad in November issue for address and catalog information, wen) I have received numerous letters and I thank you for that. Many of you request information on how to do certain things a n d th e best news is that the retail price is on/y $99.95 in modeling. I’m making the effort to answer every one of them. However, you can expedite things a bit by enclos­ The Laughing Whale ing a stamped self-addressed envelope. Box 191 Fernando Ramos, 19361 Mesa Dr., Villa Park, CA 91667. Wiscasset, ME 04578 (207) 882-6870 Fuel Lines . . . .Continued from page 28 of methanol and propylene oxide with super. a problem. the usual percentage of lubricant. Propy­ For now, the new K&B is just sitting in I have a rather simple solution for lene oxide is a great ignitor. Most an almost-done PB independent sus­ cutting out and flush mounting the standard commercial fuel contains one pension car, so I haven’t run it yet. More windows. As I cover the fuselage sides, or two percent. If you intend to use it, on this motor as soon as we make noise the window areas are covered over as use a lot of caution. It’s quite volatile in with it... · well. After water shrinking and doping its pure state, and as the second part of completely, each window opening is the name implies it’s a great oxidizer. carefully cut using a sharp Uber knife. F/F Scale . . . . Continued from page 61 That's why it's such a good ignitor and This provides me with a near perfect why it helps cold weather starting. Away, Mike Midkiff. template for each window. By wetting Now, if all that doesn't work, pack it For those of you who would like to the back of these templates with water, up for the day, and have a tailgate party subscribe to their outstanding news­ they will adhere to the acetate until with your wife’s new wagon. letter, send ten bucks to FLYING ACES trimmed. Guys, have a blessed Christmas and CLUB G.H.Q., 3301 Cindy Lane, Erie, PA If you have to glue the acetate on the joyous New Year. · 16506. By the way G.H.Q., where is next outside of the window frame, obviously, year’s Flying Aces Nats going to be? the least amount of edge you have the For the most part, cabin monoplanes neater the job. Any more than 1/32 is too Electric...... Continued from page 49 are the easiest airplanes to model. How­ much. With the window template stuck know! ever, the biggest pain for me with these on the acetate, just trim it about 1/32 Anyhow, the first JoMac charger is not types of aircraft, are the windshields, oversize all around, and you quickly a digital one, the #804, but a resistance and side glass panels. I’ve talked about have a window. type, which will charge a fully dis­ windshields before, but not the side I prefer to use Wilhold’s R/C 56 glue charged four or six-cell pack to full panels. Many of you are probably saying for attachment. It bonds quickly, dries charge in 15 minutes. There isnopeakto to yourselves, “ Side panels, there’s clear, and if you goof, you can clean the see at the full charge, but as long as the nothing hard about these since they are acetate with water and start over. Not so pack does not start to heat up, it is not generally flat!” One of the reasons side with Jet or others. These kinds of adhe­ overcharged. A good rule of thumb is to window panels bother me, is that it is sives will permanently mar the acetate. put in 60 ampere minutes. To get this, difficult to conceal the edge of the Peck-Polymers has a new release just average the starting charge current acetate. Some modelers just lay on one called the Pony Blimp. This helium filled with the present meter reading, and long strip of acetate and cover all panels model is capable of lifting 28ounces,yet multiply by the time on the meter. with this strip. I much prefer to cut and small enough that the cost to fill it is Usually you use the starting current that trim so that the acetate is flush with the reasonable. It is designed to be flown shows after about 30 seconds, because fuselage sides. In order to do this, the indoors and is powered with a couple of the very start of the charge shows too big acetate has to be thick enough to be self- small electric motors. It is a completely a jump for the math to work out right. supporting, so to speak. On light rubber fabricated kit, using only the best ma­ Let’s say the current at 30 seconds is five models, of course, this isn’t practical be­ terial available. amperes, and after 10 minutes it is three cause the thicker acetate means more Here are some of the specifications. It amperes. The average is four amperes, weight. However, on larger rubber is 11 ft. long, 4 ft. in diameter, with a and this times time gives 40 ampere models and gas powered ones, this is not volume of 80 cubic ft. It requires a 3- minutes, so you still have a way to go. 78 MODEL BUILDER > i \ ΪΪΙΪϊΛ ι ~ Sand a dollar bill for postage ' I > r* 7 μ I I r ir i ri I and handling w ith your name % I i m fc * i \ I Ψ k Ψ b W* I and address lo r our 12*paga catalog of R/C sailplanes, sport planes, sport scale and SCALE-R/C accessories. 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A j e m c o "MASTER SCALE SERIES" R/C KIT SPECIFI CATIONS LIMITED Span...... PRODUCTION KIT Designed to satisfy the most demanding scale buff! Wing Area__ ...... 780 • Five piece canopy Length...... S1 Each section moulded SBD-5 “ DAUNTLESS” DIVE BOMBER for A-24) Engine...... 60-90 separate for exact scale Channels...... 4-8 Weight...... • Flaps and dive brakes have ell 318 hole· made OPTIONAL FUNCTIONS lor you Send a $5 bill lor ^ ^Information pack: Includes , * Retracts • Scale cowl w/dummy lour 4x6" color photos, 12-page * Flaps engine [ catalogue, “Flight Training J * Dive Brakes * Retracting Tall Hook • Molded 1000 lb. , Manual", and 4-page into __ sheet about the kit. "v-. * 1000 lb. bomb drop bomb w/die cut line TOO lb. bomb drop • Ole cut dash w/gauget I canopy i forage • Pilot chair Smpartment L· • Machine gunners chair Operating bomb yoke * All of the above ere fully • Complete plans lor Illustrated on the plane making the twin .30 CAL M.G.’s • Scale Wmt. Bros. M.G. belle • Four color, three view· • Black line three view! • Four 3β"χ48" blueprint* show how to do It all • Indepth Instruction· AVAILABLE DIRECT ONLY PRICE: • Foam core with sheet Send Check or Money Order. *16500 let PLACE • AM balsa conetructlon (WE PAY SHIPPING 6th ANNUAL WESTERN M a r k 's IN THE CONTINEN­ • Built up aileron· and tall SCALE NATIONALS TAL U.S.) leathers. Parte ere all CREDIT CARO m 1578 Osage St., MASTERCARD-VISA die cut CUSTOMERS... ■£ San Marcos, CA 92069 ORDER BY f — S 8ANKAMERICARD WELCOME • JEM LOC construction PHONE \ * We pay postage Calif, reeldent· add 6% • Beautilul decal sheet (714) 744-9605 (Mon.-Thurs.) Sale· Tax

JANUARY 1982 79 for the Doolittle Dash, he mightn’t be JT REPLICA OLD TIMERS partial kits Ί able to fly. FREE FLICHT OR RUDDER ONLY R/C The Dash consists of an elimination ^ . 0 2 0 CAS OR ELECTRIC POWERED FULL KITS ^ round of heats among the 12 fastest ™ E QUAKER,., contestants as determined by times. The From 1936: C Λ / -----Λ frequency breakdown allowed 4 three- The FLYING QUAKER ------/ ------\ plane heats to be run. The first heat From'm?: Fj-y- ~~ ____ ^ pitted the two fastest guys, Brueshaber 6:13 Scale. 36" Span O The QUAKER FLASH 67" Span--$17.50 J* and Block, with Whitson. Block blew $19.95 Additional .020s: 30" Buzzard Bombshell. $11.9$; Both are Rib. Tip. and Former Partial Kits. They their doors off. The 2nd heat was be­ 38" Playboy S r.. $12.95; 31" New Ruler. .$13.9$; feature Machine Cut and Sanded Parts. Full Size tween Steine, Schlenker, and Latsha. 36" Miss America. $12.9$; 36" Clipper MK II. $19.9$; Construction Plans (♦ Megow's Plan), and Extens­ 36" Mercury. $13.9$; 30.5" Ranger. $13.9$; 36" ive Building Notes. For Free Flight or R/C. they Reuther very bravely lent Latsha his Super Buccaneer. $19.95; 30" Request. $12.95; both meet all SAM FF and R/C requirements. plane so Dave could participate in the 35" Twin Cyclone. $12.9$. 36" Cavalier. $13.9$. flyoffs. Schlenker easily won his heat. In “ SERIES S0“ OLD TIMER 50“ WINGSPAN The LONG CABIN’ A·!« T.fl*li£_SPQFlTST,fcB. $39.95 • Q Q 7 78" Span. Classic Cabin. Plan Included. the 3rd heat, Bartels won over DeYoung POWERHOUSE. $39.9$ $20.00 and Hoffman. The 4th heat was won by .09 TO .15 3 CHANNEL R/C Jacobson, over Gager and Lasher. At your Dealer or add $2.00 per order^order That set the stage for the final barn­ m m rn s w m m > for UPS. Ca. Rest 8044 Uglon Ptač·. Na6, Midway City. Ca 92665 add 61 for Tax. burner. Everyone's attention was riveted Ík - M on the "big 4” in anticipation of a good The Model 801 does have a volt meter, 1:22 and tied in points with two other race. When it was all over, Bobby Black and you can see enough of a peak to tell fliers; Dave "B.L.O.N.L.A.A.” Latsha, had done it again for the 2nd year in a when you are close to a complete who had managed to make one com­ row. charge. This charger will charge six or posite airplane out of his mid-airs, had In amongst all the repairing, racing four-cell AA or sub-C packs from com­ managed to bump with another plane and chasing around, I found little time to pletely discharged to fully charged in 15 again, but this time neither of the planes do much photographing, and for the minutes, so it is quite versatile. The were lost. 2nd year in a row, I imposed on Paul Model 803 is digital, and so it is much Saturday had really been a day of Bartels to help out. Thanks, Paul! easier to see the peak. It also has a really carnage, with many airplanes going in. In closing, I’d like to acknowledge the unique feature; you can set the meter so Radio failure didn’t seem to play as big a passing of a good friend, Sid Axelrod, of it will shut itself off when a certain part as did the fact that the planes were Top Flite. His dedication w ill be missed voltage is reached, so you don’t have to pretty evenly matched speedwise and by all of us in the hobby he loved. · start with a fully discharged pack. All the everybody wanted that inside groove chargers run from a 12-volt battery. around the pylons. Saturday evening Boats...... Continued from page 45 These chargers are very well made, I am was fairly quiet, as many racers were impressed with the quality that goes into repairing airplanes or re-working props the design, it was time to give birth to the the JoMac chargers, and I recommend . . . including Bob Reuther! (That's a model. them. I also recommend the instructions reference to an inside story ... you had Gathering the necessary material to that go with them, they are excellent! At to be there!) build the boat, it occurred to me that I last, instructions that really tell you how Sunday dawned slightly warmer, and hadn’t built an original design since the to charge, and w hy, and what to expect. in the two rounds flown that day, the spring of 1978. That three year drought Most manufacturers just tell you to turn cut-off time to get in the Doolittle ended when the pieces were traced on the switch! Thanks, JoMac, for taking Trophy Dash dropped from the 1:30’s plywood and piles of sawdust began the time to do the instructions right! My down to 1:29. accumulating around my Dremel saw. It price list is a bit dated. I think the prices Doug Brueshaber continued to win was like I was a born again model boat are about $33 for the 804, $44 for the 801, his heats, to wind up the only contestant maker. I was really on a high. While and $100 for the 803. Write JoMac, 12704 with 28 points for first place; Bobby assembling the basic framework, I tried NE 124th St., Kirkland, WA 98033 for Black was in 2nd with 27 points; Forest Hot Stuff Super T for the first time, and I more information. Whitson was all alone in 3rd, and a fly-off have to say it is fabulous. The other super Well, I've run on longer than I in­ for 4th between Rex Knepper and Roger glue I’d used worked great; but it was so tended, so see you at the contest! · Steine was won by Rex. Brueshaber’s thick it was difficult to apply in some best time of 1:22 was good enough for situations. Using Super T, I assembled the fast time prize. the framework in a couple of hours. I Pylon...... Continued from page 43 A mid-air in the 7th round between intended to make the boat easy to build the airplanes had been. By the time five Dave Latsha (yep!) and Bob Reuther and the framework certainly met that rounds had been flown off, Doug Brue- eliminated Dave’s composite airplane goal. With the completion of the frame­ shaber was owner of the fastest time of and it looked like although he qualified work, the process of sheeting the hull began. Here again, it was my intention to make this facet of construction as easy as TREAT YOURSELF TO A possible. The sheeting goes on quite easily because there are no severe bends CUSTOM BUILT to place stress on the framework. TIPOBARE Hopefully, some of the photos I took by DICK HANSON showing the construction of the boat Our custom built airframes ara used will appear in this article. (Just possibly, by many of the country's top pattern wen) They should give a good indication fliers. For example, we furnished basic components for 1/6 of the mod­ of what is involved while the boat is els flown In the 1979 Masters Tourn­ under construction. I’m confident ament. Some were TIPORARES, Dumas Boats will do a more than ade­ some were not. Building pattern birds Is a business quate job in developing a construction with us, not a sideline. We can save guideline for the model. Being the you considerable building time by largest source of model boats in the land providing you with good, basic NEW. 825 tq.in. TIPO construction. ought to have given Dumas some in­ A V A IL A B L E NOW II Write or call us concerning your sights into developing building instruc­ requirements. We will be happy to tion booklets. I’m pretty sure those 5269 Lucky Clover La. review them with you and quote Murray. Utah 94107 prices and delivery. selecting this kit will find it an easy hull to build. 80 MODEL BUILDER The completed hull was painted and rigged for running prior to ever receiv­ ing the engine. In the off chance that someone might be interested in know­ ing, K&B Super Poxy undercoat and aints were used on the original. The oat really came out looking quite nice and black and whitephotosjust don't do justice to the paint scheme. For rudder control, I used the push/pull cable system and a K&B Throttle Linkage kit provided throttle control. Everything was ready except the engine. I was able to persuade John Brodbeck of K&B to send me the prototype .45 outboard for a short period to see how the boat would actually run. No matter how good it might look on the beach, until tne boat finally hits the water, you don’t know what’s going to happen. Along with the engine, I also received a .45 outboard motor mount from Teague Model Marine, 8027 Genesta Ave., Van Nuys, CA 91406. This piece of hardware is well worth the $25 for the unit and shipping costs. I feel that an adjustable transom mount like this is a must for the model boater seeking optimum performance from his tunnel boat. What actually happened when the boat got to tne water with the .45 would be the boat was running in the don’t have anything specific on some of outboard running on the transom? It low 40s. There's no doubt in my mind the other offerings; but I can provide worked super! It ran smoothly, turned that the boat is certainly capable of some information about the Hotshot 45 exceptionally well, and looked really going faster when more time is available from Dumas Boats. sharp on the water. Of course, I have to to work with the engine and further The Hotshot 45 is 35-1/2 inches in admit that these are my perceptions. prop development. In the short time I overall length and 15 inches wide. The However, others who saw the boat run was allowed to have the .45 outboard, tunnel width is 8 inches. The total were impressed with its handling char­ the boat proved itself as a suitable running weight is right around seven acteristics. During the two times I was design. pounds. The kit will feature 1/16 birch able to run the boat before I had to send With the successful running of the plywood for sheeting and the frame­ the engine back, we tested a variety of tunnel, arrangements were finalized work is from 1/8 plywood. Although the props. Among the J.G. Products props with Dumas Boats, and by the time this exact price of the kit had not been set we tested were the G-25,1-25, H-27, and article appears the kit should be avail­ when this article was submitted, it will I-27X, and it ran with all of them. The able. It is only fair to inform you that probably be in the $60 range. best seemed to be the H-27. The Octura there are going to be other tunnels The in tro d u c tio n o f the K&B .45 1455 prop also worked very well. The .45 available for the new K&B .45 Outboard. Outboard is almost certain to create lots outboard didn't seem to develop the Those interested in this class will have of interest in a .45 tunnel class. NAMBA rpms that the .21 version has been epoxyglass, fiberglass, and wooden already has made provisions for this generating. Although we didn’t have boats available. Prices will probably class, and it will be offered at the 1982 any means of timing the speed, my guess range from around $60 to possibly $140.1 NAMBA Nationals, to be conducted at SPECIAL MODEL BUILDER SUBSCRIPT ION OF F E R FREE W ITH YOUR MONEYSAVING SUBSCRIPTION OR RENEWAL TO MODEL BUILDER MAGAZINE. THE BOOK CONTAINS ARTICLES ABOUT BUILDING. COVERING. FINISHING. AND THIS $6.95 BOOK FLIGHT ADJUSTMENT . . . PLUS FULL SIZE PLANS FOR 12 1/2-INCH SCALE. FREE FLIGHT. WWII FIGHTER PLANES. PROTECT YOUR SUBSCRIPTION IN Name AN ENVELOPE.. (please print clearly) SEE BELOW Address IMPORTANT!! IsthisaNEWI ) or RENEWED! ) tub? SEND ME: Expiration data:------C ity ____ . 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NO NEED TO CUT YOUR MAGAZINE. DUPLICATE THE FORM. OR JUST SEND US JANUARY 1982 THE INFORMA TION REQUESTED ON A SEPA RA TE PIECE OF PAPER. 81 GLEN SIG MEMORIAL H y iN G PAnERN MEET _ AT β:0° Α . Μ . MARCH 20TH & 21 ST, 1982 Pre-Novice 103rd Street Sports Complex PLAQUES Novice Jacksonville, Florida THROUGH Advanced 3RD PLACE Expert Pre-registration Required AMA sanctioned Masters ENTRY FEE: $29.00 (Includes Pilot Packet & Banquet) #s Extra Banquet Tickets: $14.00

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Legg Lake in July. If the .45 outboard Outlines are shown full sized. The ribs the right amount of "too little’’ rudder- catches on like the .21 version, this new are cut 5/64" deep from 7/76" sheet. area. The equivalent o f 36 strands of 1/8" year ought to be a real barnburner for Notice the spars are not butt-joined, but rubber o f about 42" length is used. Safe outboard enthusiasts. · instead overlap, which is less work and turns with good rubber are 7.750. Aver­ better engineering. The main spar is age time in dead air at eight o'clock in tapered in the top view from 3/32" to the evening is 2.45 minutes. · HI-HO ...... Continued from page 40 7/76". Use hard balsa for all spars. Some installed in the model, the stick weight of the ribs are faced with 1/32" sheet for Plug Sparks.. Continued from page 40 was 7.6 ounces and the Wakefield weight compression strength. The original wing was 8 ounces. To say the least, I was was very strong yet weighed only 7.7 are available, but a 1/10 h.p. estimate immensely satisfied. ounces. appears to be about right. At the Nationals (must have been The same construction is used in the The Micro engine, as drawn from 1940), the Wakefield version flew away elevator as in the wing, except no engine #107 presently in the Dave on a test hop at seven in the morning, compression members are used. All Broadsky collection, appears to be quite clocking about 5-1/2 minutes, and was sheet wood planking is 1/20". well built, with good workmanship and recovered at noon. Apparently the See Ed’s article on prop carving in our finish. The lone drawback to the overall official flights didn’t go that well. As a July '81 issue to guide you in this all- appearance is the timer, which seems stick model, later in the day, following a important part of the construction. rather "Mickey Mouse” , with stamped couple of out-of-trim flights, the Hi-Ho You might know it, the balance point sheet steel housing, stamped aluminum jumped a thermal at 200 feet and flew off was not given in the plans or text. We'll timer arm, and stamped aluminum back again, in 6:29 minutes. finish off this article by giving you Ed’s plate cam, also serving as a prop drive Fuselage construction isconventional. trimming instructions .. . minus balance washer. Use hard stuff for the "longernons”, point. Weight of the Micro was approxi­ verticals, and cross-pieces, and soft The model has a very flat glide and low mately 3-1/2 ounces. The basic compo­ wood for the stringers. sinking speed. Since glides of 17-1 to nents of the engine were primarily The aft fuselage adapts itself easily to 20-1 are impossible, we won't rave about aluminum: a permanent aluminum DTing the stab, and for heaven’s sake be this model having such phenomenal mold crankcase, fitted with a bronze sure to do it! performance. bushing, was threaded top and rear for The add-on pod is built up starting No offset thrust is used and no turn in cylinder and back plate attachment. The with the 1/8 square base, to which the the rudders. All the adjustments are with cylinder, comprised of a thin wall seam­ bulkheads are added. Ed held it on with the wing, namely, askew and incidence. less steel tu b in g , was fitte d w ith a 4-inch lengths of Scotch tape after estab­ The elevator has 3/4" positive incidence machined 10 fin aluminum cooling lishing the proper position. built in. The wing is blocked up 3/16" at jacket. The by-pass was a stamped The wing and stab are built up with the leading edge. The right wing is operation; in this case, quite similar to sliced-rib type construction. The wing advanced 1/2" to give a left circle in the Atwood’s P-30 late model. has undercamber, but the stab is flat- glide. The model has a right circle under Probably the most attractive part of bottom. power which I attribute to having just the engine was the 1/4 inch dia. brass 82 MODEL BUILDER Hobbypoxy.. .quality Hobbypoxy • The largest selection of epoxy controlled from pigment to enamel paint colors on the market, package. As a division of including metallics and primers. the Pettit Paint Company Choose from high (which has been making finishing gloss or flat, flat paints for full-size pleasure finishes. All can be boats for half a century), brushed or spray­ we start by using only the products ed. No other hobby best raw materials and paint comes close then carefully formulate Whether your model is wood, metal, to their fuel- them to our own rigid and fiberglass, plastic or a combina­ proof charac­ successfully proven tion; whether it flies, sails or teristics. specifications. Hobbypoxy.. we take care rolls, Hobbypoxy is formulated to let of the "little things". you paint, build, repair and pamper it to perfection.

• Four different epoxy glues. • "Stuff", fillers and poly­ Select the formulation right for ester resin. A complete your materials, your working series of products for sur­ time, your technique. face filling, fiberglass laminating, leveling FORMULA £ HOBBY and finishing EPOXYGLUip^f preparation. A big "FREE" offer. Send for complete literature and how- '-^■1 to-guide, and we'll tell you how to qualify for a one time, get Ψ& å P " , acquainted offer of $4.75 worth of Hobbypoxy products abso­ lutely FREE. | ^ : l HOBBYPOXY PRODUCTS A Division of Pettit Paint Company, Inc.,25 Pine Street, Rockaway, N.J. 07866 tubes that served as the exhaust pipes. These were only pressed into the cylin­ i ] : m ' \ m \ i i \ der exhaust block with no apparent welding. It was a shame to break one of r© 32nd ANNUAL these exhaust stacks off. The piston design was a little ahead of the times, being flat, ala the much later [SOUTHWESTERN! Super Tigre engines that proved so REGIONALS MODEL AIRPLANE CHAMPIONSHIPS successful in FAI Competition. W ithout a baffle plate, starting the Micro engine PHOENIX, ARIZONA by hand was no easy chore. AAA CONTEST In closing off, it should be noted that the crankcase design shows the influ­ January 30,31,1982 ence of Jim Brown, a later manufacturer Join us (or lop notch midwinter contest (lying of the Little Dynamite and Thermite in sunny Phoenix. Arizona engines. Actually, not many modelers Control Lin· F r·· Flight Speed V i A Gas are aware of the fact that the San Group 1 Francisco Bay Area was also a hotbed of Formula 40 A Gas Group 2 engine manufacturers. However, be­ A Speed B Speed cause of advertising and larger produc­ Group 3 tion, most all modelers assume all of the Vi A Speed A 1 & A-2(FAI) California engines were made in the D Speed Vi A Profile Proto P 30 Rubber (Jr.) south. FAI Speed P 30 Rubber (Sr Op ) Racing Mulvehill We will continue to bring all engines AMA Rat Race Wakefield to the readers attention, particularly AMA Scale Race Coup D Hiver ACLA Slow Rat Race those little known engines of Northern 020 Replica Precision Aerobatics (Pampa) ABC Gas OFT Cabin & F>ylon California. Combat H/L Glider Jr Slow Combat (Double Elim) H/L Glider Sr (Op THIRTY YEARS AGO, I WAS... AMA Combat (Double Elim) Radio SWCLA Big Goodyear Old Timer R C This month, we are indebted to Don AMA Slow Rat Race Jenkins, 2915 E. 65th St., Indianapolis, IN Sport Scale 46220 for a most interesting yarn about Navy Carrier Protile the old Zipper. As Don sez: CONTEST SITE. BUCKEYE AIRPORT For further information call or write In the summer of 1946, I entered my Skip Jackson. Contest Director first season o f F/F Competition with a 1 (827 N 31st Ave · Phoen.x AZ 85010 · (602)866 7653 1939 Zipper. This model had been started by a fellow who joined the RAF in 1940. At this same time, I began con-

JANUARY 1982 83 THE BEST IN GIANT SCALE Make the Right Choice the First Time

2 .4 C u .ln . Suggested List: $219 .9 5 NEW! Dealers and Direct R.M.TITAN 4.3 Cu.ln.,6 1/2 H P. MARINE KIORITZ complete with recoil start­ er, mount, water-cooled head: reccommended $289.95 48” to 72" hulls $1 8 9 .9 5 SoldI Direct Only I 1 h r , '4 Kroot/. «ιη:«·ιΙι anil m innp .ihtu* am High- $ tin* R M Tihtti i* .1 litpli qudlitylitowi*/ lypr rngt»· qiMlity btowiirtvpv engines rn«M by Kmmik in Zinger Props(20 to 24 diameter to to 16 pitched) miullf by Sob* Hi W Gt'triiiitiy Tit,in .* Ii t '2 MPut I I 1.1(140 I»'·· 4ifCf.ltt vristotl h4* prnvrit It) bo E x h a u s t M a n ifo ld KitllltsKiorit2. Kawasaki & others) S1 0 .0 0 to 3 0 lb* U»«· KiOnU f«·· Velocity Stack Kit (Kioritz. Quadra) 3 .0 0 tin.iiiiig* on Ihn i r.ittk tnlliri Im jiin yi on tht· fotí I I optimum pwrlormarsce anil «olietxbty $|«mtari1 •mhI m m * Mitnbon tof «·.»*<· nt intl.ill.ibot» Tht» f I ·· i' .··· ‘in .... . * ■ -"il ■>...... 3 2 H P Six-Bolt Prop Hub (Quadral 1 9 .9 5 rnøin« ιη ρ ι ί Ί Ί piops trom .i minimum of ? 2 · 1 2 all I Thrust Ball Bo jnr< /\o n Cf.H’h Rol/ur Bttjnm json Special Length Prop Hubs (for Kioritz b other engines) 1 9 .9 5 lin· iv.ii u(i fi> 7 4 e t 6 I bi· R M Tit.in n hU.^ii v I thø Rod And Wmghtt 6 1/2 Ibt ϋιιΙκιΙ lo* Ih«· Nosen .»nit lu n * · MiHtiinl« .nul othn» | Kioritz Digital Tach (Spark impulse triggered) 5 9 .9 5 Ingb pi'Hoim^nce ιίολιψιν Mowrvnr thi* R M Bennet Muffler ib & b Specialties) 1 7 .9 5 Tit,in i tintes iiim plntr νν·ι*ι 6 - Bolt μι op hub <;,»\t Champion Plugs (Rc j -8 resistor) 2 .5 0 mot.nmn.int mutll«*· .»ml rrkiMor pluij KIORITZ Belray MC-1 Synthetic Oil (12 02 - 501 mm) 2 .9 5

Call or Write for Full Details Box 251 · SANDWILLE. OHIO 44671 ECHO ROUSH MFG. Phone (216) 866-9462 or 484-4374 struction of a wartime kit of the Ameri­ On arriving, what a perfect day to test engine was in that Zipper. With such a can Ace. Wood was terrible, with soft a model! After lest gliding, the model promising start, Dick Foxworthy helped wood where hard wood was needed, was put up for a TO second engine run. me pick up the pieces and assured me it and vice versa. Perfect! I was ecstatic! At that time, I could be repaired in time for the contest Eventually, I struggled through the didn't think much about the left turn on next Sunday. American Ace. When the war was over, I climb the Zipper was in, as it did glide Painted chrome yellow-orange, the received a call from the younger brother nicely in a right turn. completed Zipper looked like a chicken (Fred) of the boy who had gone to war Thoroughly enthused now, I made an that had come out second best with a and as I learned, had been killed in official flight with a cautious engine giant Chicken Hawk. After testing, I action. I was offered the remains of this setting of about 75% power. Real good found that any more than 70% power quarter-built Zipper as the family had flight! The next flight with the same and the darn thing would come whip­ decided to move to California. setting was equally as good, but, as ping in on the left wing. I had to be I could hardly pedal my bike fast usual, landed in the only tree around. satisfied with this setting for the rest of enough. Naturally there was more than I The repairs seemed to be intermin­ the season. could carry on a bike, so back to home to able. Glue and dope never seemed to Next year in T947, the hot shots borrow dear old dad’s M odel A Ford. I dry. Finally, after two hours, the model decided to help me out by getting the figure it took more time to clean the was ready to fly. Now we’ll show ’em! Orange Monster (as it was dubbed) accumulated dust of seven years than it Being firmly in second place and need­ straightened o u t for proper power did to acquire the model. ing better than two minutes to win, pattern. I really think the boys were tired Well, this time I got a little smart and might as well shoot the works. of dodging the model, just about all the called Gene Foxworthy for advice. He The new Delong 30 (one of the new older fellows took a crack at trying to was quite cooperative and we spent hot die casting types) was q uite an adjust the model, but none could ever about six hours each night, Just in time to engine. This time I advanced the timer. seem to cure the left hand spin prob­ beat the deadline of a contest two weeks Oh boy, what power, let ’er go! All went lem. To this day, I cannot figure what before H/S graduation. well for the first TOO feet, then the left ailed that Zipper. Inasmuch as my friend was unable to wing dropped too far and the model Late in T948, I quit flying the Zipper attend the meet at Flwood, Indiana, Dick came screaming in, all this in TO seconds. and went for a few ideas of my own. Foxworthy, the older brother, took me Naturally, with such a spectacular Later on, during the Korean War, the on the hour-and-a-half trip northeast of smash (wing in three pieces, etc.), every­ Zipper and all my Air Trails magazines Indianapolis. one wanted to know what kind of were destroyed in a garage fire. I have

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AVAILABLE ONLY FROM ELECTROLINE MODELS P Ο BOX 2503. BEVERLY HILLS. CA 90213

seen only one Zipper (flies right, right) A Big, Beautiful 43 " that didn't have those earth jarring crashes. R/C TfJG BOAT . . ] I still have the old Delong 30 engine, I but somehow it doesn’t seem to have the power it had in those days when it powered the Orange Zipper. (Memories can be great, huh?) BARON 58 (As featured in June 79 Scale R/C Modeler) BRUCE LESTER AGAIN! PLANS Where this Canadian, Bruce Lester, BEECHCRAFT BARON MODEL 58: 2Vi" Scale-85 wingspan-1000 sq in (3) 3'x6‘ sheets SI 5.00. keeps coming up with these old Na­ Beechcraft Fin Insignia 52 00 tionals photos beats the columnist. BEECHCRAFT BONANZA A36: 2H Scale-86 Bruce certainly was a busy boy with his wingspan-1300 sq in (3) S'xe1^' sheets $17.50. All plans have easy to read isometric details and come little Kodak Brownie camera. rolled m a deluxe mailing lube. Add $1.50 for postage. This m onth’s picture. Photo No. 6, Overseas postage $8.00 Ala res. add 6% sales tax Complete with a Futaba 2 Channel Radio System Electronic shows what this columnist believes is the Speed Control Heavy Duty Electric Drive Motor & Battery BUD CADDELL Price $695.00 I o o M l Sinai. N Y very first time this Joe Weathers model 1525 Badham Dr.. Dept. M. Birmingham. AL 35216 has ever been published. As one can 205 822-4312 RON S HOBBY STUDIO Can lot ncians -5l6i 331 3265 Route» 347 & 25A, Mount Sinai. New York 11766 readily see, this model was designed DEALER INQUIRIES INVITED primarily for the very popular Los Angeles Precision type contests. a throwback to the earlier days, as the successful in selling Tom Thumb engines, Plans? Well, none that this columnist is monoplane cabin C.A. design was mak­ but eventually the advent of World War aware of, as he inherited all of Joe’s ing itself felt in the record books (Hughes II put an end to that paying proposition. drawings beginning way back in 1932. Hobart, for example). The columnist recently received a Joe was a meticulous draftsman, even We will continue to run shots of Joe letter from Lyle M. “ Bud” Warren, 207 then, and all drawings (even though with his old stuff and possibly of his latest Plum Dr., Exeter, CA 93221, enclosing they are on butcher paper) are neatly ideas, like his Simple Simon. several photos among which we are numbered and dated. STILL MORE OLD TIMERS! featuring Photo No. 8 showing Bud’s Unfortunately, the plans are all his We are indebted to Harold Lanser for version of the Bunch Scorpion. He rubber powered and towline glider being able to run down the where­ stated he had lent Howard Broughton models. Joe couldn’t resist the blandish­ abouts of Bud Warren. If that name (formerly of Bunch) the use of the ments of his friends, and lent out most all doesn't ring a bell, then you are truly not Scorpion (converted to a seaplane) at a of his gas powered model plans. Looks an old timer! Lake Elsinore fly-in. Unfortunately, Bud like this is another one lost to limbo. For the benefit of the uninitiated, Bud was unable to attend as he says these old Those people interested in what Warren was responsible for selling the bones at 80 really start to slow down. Elbert ). Weathers is doing these days Tom Thumb engines. A little background (He’s telling me!) would be surprised to find that Joe has is in order here. Bud goes on to enclose a photo (not been Chief Draftsman for National Cash Cleveland Model Co. had gotten into printed) of him and his everloving Register for years. Originally located in the gas kit business quite heavily with spouse, with Bud holding one of the first Manhattan Beach, NCR moved and set the Playboy Series, Cloudster, Fleetser, Bunch Speedway engines. Warren up headquarters in Rancho Bernardo, a Stinson Reliant, et al, and figured to do claims this motor was the forerunner for suburb of San Diego. At last reports, Joe like Comet did; i.e., come out with its the porting of the Bunch (later Aero) was still with the firm. He may have own engine to complement its kits. Tiger. retired by now. The Bunch Mfg. Co. was contacted For the benefit of the engine collec­ MORE OLD TIMERS and arrangements made to sell one of its tors, Bud ruefully admits he doesn’t have Received a flock of old shots from engine designs under the name of “ Tom one Tom Thumb engine left. Isn’t that Joseph S. O tt, 8323 Oriole Ave., Niles, IL Thumb” . After a short period of adver­ always the way!! 60648, and, of course, we had to feature tising, Cleveland abruptly dropped the SAM CHAPTER CHATTER one this month. line of engines. It has been quite some time since this Photo No. 7 shows an early 1931 It was then that Bud Warren took over column has devoted a full column to the compressed air powered biplane that the stock of Tom Thumb engines that doings of the various SAM Chapters, but was featured in Popular Aviation at that has accumulated at the Bunch Factory. it seems we are always running out of time. Compressed air models were quite Bud, who was quite a competitor in space! Let’s take a quick peek, anyway. popular at that time, with Bert Pond Southern California circles, immediate­ SAM 7 (Peru Model Shop), Joe Ott (Miniature ly started using this engine in modified George Armstead, 89 Harvest Ln., Motors), and others producing engines. versions of the Modelcraft Scorpion. For Glastonbury, CT 06033, Contest Man­ The biplane configuration wasactually quite some time, Warren was quite ager for the 1982 SAM Champs to be JANUARY 1982 85 2. Lee Kullman 10:25 3. Devera Wilson 8:56 4. Maryann Pond 6:56 A QUICK START 5. Sandy Alten 3:08 You get fast starts every time with the new 6. Janet Roselle 1:58 Buzz-Box,M. Simply connect it to your glow 7. Barbara Walton 1:26 plug and flip the prop. You can hear the differ­ Also in the SAM 21 newsletter were ence when there is a . . . the results of the “ Fly-for-Bucks” Annual

Ι/ ' SHORTED OR OPEN PLUG LACK OF FUEL put on by Editor and Publisher Johnson ι/ ' DAMAGED OR DEFECTIVE PLUG \* FOULED PLUG of the Colusa Sun-Herald. WRONG FUEL/AIR MIXTURE ✓ FLOODED ENGINE Of course, Frank Swaney got roped in Ask your dealer for this unique plug driver or for the C.D. work, but who else was send $49.95. Kits also available directly from there? Swaney ran an excellent contest Wings. Add $2.00 for postage and handling. in weather that allowed tremendous Connecticut residents add sales tax. long flights. Thank goodness he kept a close eye on the frequency control to DEALER INQUIRIES INVITED keep things rolling! engineering An interesting gimmick was tried at P.O. Box 3352, Stamford, CT 06905 this meet, with the approval of the flyers. The Texaco Event was limited to 30 minute flights with a landing circle wherein the contestant measured the distance from the center of the circle to TN£ GENE SLATE the center of his model. It was a great NAMBA 2260 way to break in the idea as no less than FANTASTIC four competitors had 30 minute flights!! FCC KBSF 7771 Four events were held on a one-day HU SON .IS ! contest and don’t think this didn’t keep Classic oMamepØates/ the boys busy!! Somehow, $125.00 was For dotallod brochure, 3 " X 1" self-adhesive brass plate with divided up by three for each event. First black acrylic finish place winners were: Antique, Charlie sond 25 cents to: 1 line: name only ...... $3.00 Critch with a perfect 30:00; Limited Kustom Kraftsmanshlp 2 lines: name & organization .... $4.00 Engine Run, Don Bekins with a perfect P.O. Box 2 6 9 9 3 lines: name, org. & FCC No...... $5.00 21:00; Texaco with Ed Solenberger Laguna Hills, CA 92653 (Postage & handling included) winning by landing w ithin 15 feet after a Ph: (7 14) 8 30-5 162 φβίςοηοΡιίΐ) φ(?ι« 30 minute flight; and finally, Jim Kyncy Box 3308, Kent, WA 98031 with two 15 minute flights in 1/2A Texaco landing only nine feet from the Dealer Inquiries Invited (WA Stat· r*skJ*nU add 5.4% sales tax) p in ! A very interestin g m eet. Just a shame we don't have the column space B, and R/C Electric. for more details. held at Westover AFB over the Fourth of Now get busy and get those models SAM 27 July holidays, sent us Photo No. 9 to ready! See you all there in 1982! Based Just a quickie note here as the lead he is no slouch when it comes to on reports of the super meets SAM 7 has article dealt primarily with the Challenge K ng and flying old timer models. been holding, this SAM Champs should meet. SAM 27 held its annual one day By now you probably have given up be the largest of all! meet with 44 entries in three events. The trying to identity all the models, so here SAM 21 meet was unusual in one respect: Don goes for the benefit of all (left to right): Trust Jack Alten, Prexy of SAM 21, to Bekins failed to place in any event. Is Buzzard Bombshell (Ohlsson 60), come up with the darndest fun meet you this a sign the boys are starting to catch Apache (Ohlsson 60), Arrow (K&B 19), ever participated in. Held in conjunc­ up with Don?? Long Cabin (Wahl Brown Jr.), Red tion with the SAM 21 Annual Picnic and SAM 29 Zephyr (Ohlsson 60), Valkyrie (Forster Fun-Fly, this meet was strictly for the We are indebted to Dr. James W. “ Bo” 99), Winged Yankee (Bantam 19), Fla­ wives. Buice, 600 Eighth Ave., Suite 106, Ft. mingo (Ohlsson 60), Saddler Pacemaker The idea here was to have his wife take Worth, TX 76104 for an excellent report (Super Cyclone), So Long (O&R 23), control of the model and fly it as long as and many photos of the Planesmen 6th Playboy Senior (Ohlsson 60), and Brook­ hubby has confidence in his spouse. To Annual Labor Day Regional Champion­ lyn Dodger (Forster 29). prevent wives from simply allowing the ships. This meet included all standard As George sez, he also likes rubber. model to fly in a circle a figure eight AM A Free Flight events (1/2A Gas, Class One of these days he will have 12 people course was prescribed. In other words, A, B, CD, Payload Junior Power, A1/A2 to launch them all at once. Also, for the model had to turn left 180 degrees Glider, FHand Launched Glider Junior those who are interested in the events to and then right 180 degrees. Don't think and O pen; Nostalgia 1/2A Gas and be offered at the 1982 Champs here is this didn’t add to the fun. ABCD Gas, Coupe, Mulvilhill Rubber the very ambitious program initiated by Photo No. 10 shows exactly what is both Junior and Open, F/F Scale Gas, F/F SAM 7: meant as Maryann Pond flies the Dallaire Scale Rubber, Electric F/F, and Peanut July 3: Class A Cabin, Class C Pylon, 30 belonging to hubby, John. Note how the Scale . . . whew!). Sec. Antique, Hand Launched Glider, writer is supporting his wife. Actually it Not content with that, the following Rubber Scale, R/C Class A, R/C 1/2A was the other way around! On the O/T Events were offered: O/T Rubber Texaco, R/C Class C Ignition, and F/F second flight, Maryann got the model so F/F, Cabin Gas, Pylon Gas, 020 Replica, Pylon Gas Glow. high and far away, all the experts had a R/C Texaco, R/C 1/2A Texaco, R/C AB July 4: Class B Cabin, Class A Pylon, tough time getting that bird back. Gas, R/C C Gas, R/C Antique, R/C .020 Replica, 020 Replica Cabin, Rubber The winners were given bottles of Ignition only, and R/C Electric. Wotta Cabin R.O.G., R/C Class C, R/C Antique, champagne to properly celebrate the meet!! R/C Class AB Ignition, F/F Cabin Gas occasion. There is no question in this For all of this, we simply had to run a Glow, and Twin Pusher. columnist’s mind that old timers are the photo of the Contest Director, Dave July 5: Class B Pylon, Class C Cabin, ideal way to learn how to fly radio Benepe, as seen in Photo No. 11, for all Rubber Stick, Scale Gas, Towline Glider, control. Just look at these results! the untiring work on behalf of the Compressed Air, R/C Texaco, R/C Class 1. Betsy Samuelson 10:58 modelers. Dave also wishes to acknowl- 86 MODEL BUILDER FOX MFG. SLASHES YOUR FUEL COSTS;

At Your Favorite Model Shop: P in t. . 2.75 For the past 30 years, nitromethane has been a relatively cheap Q u a rt. 4.50 power additive and ignition accelerator. While it is a necessary ingredient in engines designed for it, most Imported engines and G allon 13.95 many of our newer engines operate well on a basic alcohol fuel. J J FOX "Gold Star" Fuel contains a detergent and an igniter which G O L D S T A R makes it run a bit cleaner and start and idle a bit better than the basic 22% castor oil. 78% methanol mix. Try it, your engine and your wallet will both like it. F O X .4 0

Bor·: .800 Strok·: .790 Displ: .40 R.P.M.: 14.250 with 10-6 Prop Weight: 12 oz. Fuel Consumption: .8 oz. m inut·

The FOX 40-BB is the most rugged .40 on the market and possibly the most power­ ful In eight years of refinement it has developed Into a highly desirable R/C powerplant It starts easily by hand, idles 55 Gallon Drum . . . $160.00 beautifully and flies all models designed for 40 s and many designed for a 60. Ideal for Clubs & Active Flyers (Available only Direct from Fox Mfg. Co.) Construction features Fox patent crank case design, button head, nitrided cyl­ inder, cast aluminum piston, bar stock conn rod bushed, two ball bearings, a 590 These American-Made Fox Engines shaft size and Mark X carburetor. This en­ gine runs beautifully on our "Gold Star" Fuel. Fuel cost for 10 minutes flying time is are now set up approximately 18c based on drum prices

#24100 FOX 40 BB-RC $94.95 to Run on "No-Nitro" Fuel: #90252 FOX 40 Muffler 12.95 #50404 Engine Mount 9 00

FOX. 78 BB-RC FOX “EAGLE .60 This big willing brute has the torque to handle a 12-6. 12-7, 13-5 or 14-4 prop Im­ Bor·: 1.00 Strok·: 1.00 Displ: .785 provements for 1982 include a sturdier R.P.M.: 12.500 on 12-6 Prop The FOX EAGLE III has many improve­ piston, new head with offset plug, new Fuel Consumption: Ι'Λ oz. m inut· ments over the EAGLE II. resulting in con­ Mark X carburetor, improved taperlock BB-RC siderably more power, longer life, and a and thrust washer It runs great on FOX less cranky nature. Also, the EAGLE III "Gold Star" No-Nitro Fuel. Muffler is runs best on our lowest cost fuel Physical Bore: .907 Strok·: .937 Displ .61 available with Tilt-Up or Tilt-Down flange #27800 FOX 78 RC $125.00 improvements are a re designed piston, R.P.M.: 13.000 plus with 11-7 Prop Select the one best suited to your instal­ #90264 Tilt-Down Muffler 19.95 shorter conn rod. improved cylinder port­ Weight: 17 oz. lation. Fuel cost for 10 minutes flying ap­ #90265 Tilt-Up Muffler 19.95 ing. new head contour, heavier duty rear Fuol Consumption: Ι'Λ oz. m inut· proximately 25« based on drum prices. #50603 Engine Mount . 10.00 main ball bearing, improved taper lock and thrust washer Muffler is available with Tilt-Up or Tilt-Down flange. Select #26500 FOX .60 EAGLE III Side Exh $125.00 the one best suited to your installation. #90262 Tilt-Down Muffler 19.95 Fuel cost for 10 minutes flying approxi­ #90263 Tilt-Up Muffler 19 95 FOX .45 BB-RC mately 25« based on drum prices #50604 Engine Mount .. 10.00 Bore: .850 Strok·: .790 Displ: .45 R.P.M.: 15.000 with 10-6 Prop You'll Like . _ __ __ Weight: 12 oz. Fuel Consumption: .9 oz. minute Our Service: THE FOX .19 BB-RC The FOX .45 BB-RC has been further re­ We really try to take care of our customers. fined and modified to meet today's flying If you crash and need parts that are not in * We think you'll find some unusual features. needs and to operate on economy fuels. stock at your Dealer, call us at (501) Now features improved head button, ni­ 646-1656 and we will try to get parts on the »22000 FOX 19 BB-RC S89.95 trided steel cylinder, conn rod bushed way. usually within 24 hours. We offer a to r.: 650 Strok.: .600 Dlipl: .IV» »90266 Till-Down M ulllot 19 95 both ends, crankshaft has larger throw complete re build with the assurance your R.P.M.: I I . $00 with >-4 Prop »90267 Till-Up Muldet 19 95 and more counterweight. Cast aluminum repair costs will never exceed 60% of new Fuol Comumptton: .4 ox. minuto »50203 Engine Mount 8.00 piston is fitted with a freely rotating high motor price. tension ring. The carburetor is the highly Our new FOX ,19-BB about to oe released is a brand new engine acclaimed Mark X B size The beefier than from FOX incorporating the latest in technology. Schnuerle port­ average crankcase resists minor crashes Our Hot Line: (501) 646-1656 ing ot course, and rugged parts. Lots of power, a good idle. The extremely well. Fuel cost for 10 minutes flying approximately 20« based on drum special design feature is that the upper cylinder casting can be prices. turned with exhaust to either side, back, or even facing forward for marine boat use. A Muffler is being made available too with #24600 FOX .45 BB-RC.. $94 95 tilt-up or tilt-down flange. It runs great on our FOX "Gold Star" #90252 FOX 45 Muffler 12.95 Fuel. The fuel cost for 10 minutes flying time is approximately #50404 Engine Mount . , 9.00 5305 TOWSON AVE FORT SMITH. ARK 72901 10« based on our fuel drum prices. JANUARY 1982 IF YO U CAN FLY A FALCON 56 . . . A Gas, B Gas, C Gas, M ulvihill, Hand Launched Glider, Coupe, R/C Texaco, and Class C R/C. The rubber powered events were very popular. JL. jfíésň SAM 34 This columnist is happy to see another SAM Chapter formed out in the West; this one being the Sierra Antique Free Flight Society (SAFFS) out of the Reno- Carson City area. SAM 34, as SAFFS is now called, can be contacted through ... YOU'RE READY Phil McCary, 3282 Old U.S. 395 No., Carson City, NV 89701. This is a going TO LEARN HOW TO concern and w ill accept any and all FLY SCALE WITH OUR DYNAMIC fellows interested in modeling regard­ less of their field. SAM 41 TAIL DRAGGED TRAINER® How about that? Ran out of space again and we didn’t even cover the The GEE BEE Sportster is more than just another activities of SAM 3, 8,13, 30, 39, 40, and “pretty airplane” . It is the perfect model to get you 49, although we did receive newsletters from tricycle landing gears to tail draggers. And nothing and announcements. We’ll try to do better next issue. in true sport scale builds any easier than A letter from Chet Lanzo, 1485 Lester our Sportster. Average time to build Rd., Valley City, OH 44280, reminds us the airframe is 8-10 hours. Plans & this SAM Chapter is still fairly active. illustrated instructions are quite Chet sez he was sorry to miss the recent SAM Champs but couldn’t find anyone simple to follow. Ask your dealer to go with him. He did send some photos to show you the TAIL DRAGQER of the SAM 35 Bash at Sandusky, where TRAINER . . . better known as the wind was real bad that day. Photo No. 14 shows Bob (Bucky) Walter with a the GEE BEE Sportster. Lanzo R/C Stick (the original by Lanzo ®The Tail Dragger Trainer is copyrighted by won the Roberts R/C Trophy in 1937) that not only won the Antique Event but placed second in Texaco. Bob uses a Kraft radio with a Saito 60 ignition CØVERITE engine, front rotor type, at almost 8 420 BABYLON ROAD. HORSHAM. PENNSYLVANIA 19044. U S A pounds. Interestingly enough, the fuse­ lage was built up of yardsticks for the edge all the help he received from Frank outstanding success, most of the Planes- body sides as secured from J.C. Penney. and June Huffman and to all the Event men have since duplicated his model Good idea! Now you don’t have to give Managers and Timers. Things did run with the same encouraging results. an arm and a leg for clear wood at your smooth! However, as can be seen in Photo No. 13, local lumberyard and then you still have We can’t help but run pictures of Ken M illett scaled his Cumulus c/own for to saw it to size! Marion Knight as he builds such neat Class A competition. Ken is one of the SAM 35 (SAME) models. Photo No. 12 is no exception, as better flyers of SAM 27, so this model is SAM 35, according to Ben Buckle, the Marion is shown with a scaled down just another threat to win first place at n e w s le tte r e d ito r, is now o ver 200 version of the Michael Roll Berryloid the 1982 SAM Champs. members. Wow! The old timer activity is model. This beautiful design has been We won’t publish results as so many spreading like wildfire. Ken Hinton, who faithfully reproduced for the 1/2A R/C events would warrant doubling the size regularly attends the US SAM Champs, Texaco Event. For a brand new model he of this column. (Whew! wen) Dr. James sends us a few photos of the old timer didn’t do bad by taking fourth and Bruice ("Bo” to his friends) reports that activities taken at Old Warden Aero- nosing out Bruce Norman! the meet drew 229 entries with a lot of dome. Ken, who can be reached at A year or so ago, Bruce Norman stood new Juniors entering. Saxon Lodge, Little Saxham, Bury St. everyone on their ears with his 10% Most popular events where there Edmonds, Suffolk in Merrie Olde Eng­ scaled up Shereshaw Cumulus. Since his were 10 entries or more were 1/2A Gas, land, sent us Photo No. 15 of his son, Ken Hinton in the center of the mass launch that determines the winner of the Final Call!...the OHLSSON COMMEMORATIVE engine Burnham-Sheelds Perpetual Trophy. (Limited Production—Orders CLOSE Dec. 31, 1981) Guess who won again this year? Ken, of course, as he is a real solid twin pusher • Made by Herb Wahl (who created the Anniversary flyer! Brown Jr. Engine) Also from England comes Photo No. • Authorized by Mr. Irwin Ohlsson 16 showing one of Alex Imrie’s excel­ lently built old timers, free flight, of Herb's re-creation of the course! The CAVU shown in the picture Engine of the 1930’s. Ohlsson Gold Seal as designed by Ken W illard has an PRICED AS FOLLOWS: $50 deposit per engine to place acronym for a name that translates to order, four engine order limit One engine ordered $225 Ceiling and Visibility Unlimited. A second engine ® $215 Or send large addressed stamped Alex has recently taken on the chore A third engine @ $205 (364) envelope for further A fourth engine <8 $195 information. of writing an old timer column for Delivery will be slow and in accordance with order dale. Aeromodeller. With his background, the column can not help but be a >.5β displacement • Cylinder finished in 24 K gold Herb’s Model Motors success. About four issues have carried • Every engine crafted and test run by Herb Forksville, Pa 18616 his writings and everyone seems to get better. Even the photos are excellent! 88 MODEL BUILDER (See Workbench for more about O.T. activity in Europe, wen) INDOOR MODEL SUPPLY OBIT NOTICE VIRTA6 E B-C PURS /T\ INDOOR ENDURANCE RUBBER MODELS Just received a letter from Bud Perry, THE "EASY B" 2 PARLOR 3 PARLOR PLANES 1 2 'Span *3.85 COPTERS 10‘ Span *5.95 1023 Stoneleigh Ct., Tomball, TX 77375, 1 2 'Span *3 95 informing this columnist that Malcolm N* * T - y ~ y CONSOLIDATED Willis died of an apparent heart attack - PBY-9A "CATALINA” while he was on a trip to Junction. 9 f t . WING SPAN Bud goes on to say Malcolm was an A ll **8S S f U ll FORMCRS SHOWN ON PLANS 11 Pi AST iC ΓΝΟ.COWLS $ 9.90 PP excellent example of the “ Wierd Artist". THE 'TIME MACHINE " PENNY PLANE gun blisters pr cifA R $ 6 .6 0 II Span F u ll S « /· P U m I could sit for hours listening to Mai (or Full S i/· Prop J*g A LARGE Plan sheets — *5 95 "Old Bucks" as we used to call him) Plans $1695 • Picture lllu iltll« ) 6 f t . WING SPAN MOOtL P B Y -5 A • ConcJen*·· Pep·' expound on some of his theories on • Ultra Light Balte universal energy and organic forces. I CMOWC COWLS t 6.so p r . Plans $ 12 95 • Mini Bearing GUN GLISTERS | 4.50 PR a DO 12^)0 POSTAGE • Micro W athert alwavs left his presence with a headache • P ire lli R ubber CATALOG-OVCR 3 0 PLANS $100 DEALERS WRlTE National Record but loved him dearly. .June 1961— 3-min 9-sec Malcolm's craftsmanship was not WORLD 0 WIPE The World's 1st restricted to model airplanes, as he built Omllhopter Kit! SID MORGAN Fascinating! the most fantastic clocks, rifles, and 13137 ORMOND .BELLEVILLE , MICH. 4BIII u.SA 2 Minut# Flights musical instruments. As a matter of fact, WEIGHT 1/8 OZ the late movie actor, Audie Murphy, BROWN PEANUT A-23 CO- wrote a blank check to Willis for a .45 ONLY V« o/.! caliber Kentucky rifle and old Mai Including Prop A Tank turned him down flat. An Engineering Triumph He also built a full size Goodyear Quiet—Clean — Durable Racer, a Lovings' Love, that looked for Engine 39.95 everything like a winner. Finding that he Charger 9.95 Order both A we will couldn't afford to fly the plane, he cut it ship airmail poalpald up into plywood squares. I ended up with a load of plywood for firewalls. INDOOR MODEL AIRPLANES by Ron Wllllama 264 Pga. and Over 200 llluatrationa plus 2 FREE I guess I could talk about Old Bucks in STEARMAN “P T 17” Full Size Plan Sheets lor I.M.S. Easy "B" $12.95 more detail but this would take literally INDOOR MODEL AIRPLANES by Law Gitlow Offered in Two Sizes, for Quadra or .60 46 Pga. A Over 100 llluatrationa (reprint)___ $3.95 hundreds o f pages. Suffice to say, I can PEANUT POWER by Hannen. 80 Pge. $7.95 go into any room in my home and I can Q uartor Scolo: Q uadra typo Enginos. 96 : Spon 15 P-NUT PLANS $6.00— P-NUT BALSA PACK $6.95 2 Scale: For .60 Engines. 64' j Span. 1000 Sq. In. INDOOR BALSA PACK $6.95 see things that Buck made for me, and Q uarter Scale Plan Set: $32.50 2 Scale Plan: $18.50 ROLL OF MICROLITE COVERING______$3.25 also for my wife. I smile as there is a story Pleas*?, add $2 50 to* Postage iíHandiing Otn*** designs am CONDENSER PAPER S2.50-WASHERS $1.50 available too send 00 to* Catalog Partial Kits ate ottered RUBBER LUBE $1.50— CEMENT $1.50 behind each project. I'm going to miss to* all Our designs to Simplify Vout building THRUST BEARING: New Tiny .50 New Duel 1.00 "Old Bucks"/! RICHARD G . BARRON Phone 602ι933·6911 NEW MARK 1 WINDERS— 16:1______$11.95 NEW SMOOTHIE WINDERS—6:1______$3.95 WRAP-UP 10625 West Alice Ave.. Peoria. A rizona 85345 U.S.A. 6.1 Winder only $1.95 with $25 Ordar That’s about it for this issue (whew!). ALL ORDERS å KITS ADD 10% POSTAGE We hope to carry more info about SAM peller with the noseblock in place on the MAXIMUM POSTAGE. $3.00 Chapter doings. After all, they are the front of the fuselage. 1982 18 PG. CATALOG $1.00 backbone of S.A.M. Keep the faith, and Seventh, there should be no warps or N t W DEALER INQUIRIES INVITED support your local Chapter! · twists in any of the flying surfaces. With this type of wing strut, a warp is hard to BOX C. GARBERVILLE, CA 95440 remove after the struts are installed, so Peanut...... Continued from page 53 carefully check the wings before install­ there are many more shown on Mr. ing the struts. so, it is relatively uncomplicated; refer Hirsh’s three views, are made from balsa We’ve had a lot of fun with our Lairds, to the diagram. scraps or whatever else is suitable from happy flying with yours. · This brings up another servo trick for the scrap box. similar uses ... the addition of one more Fifth, cover the model with light­ cell to the battery pack for additional Electronics... Continued from page 33 weight tissue. Shrink it with a fog of power and speed. In other words, water and when dry dope the wings and foot. Talk about am bitious... instead of the usual four-cell pack, use tail with one coat and the fuselage with Anyway, Bob wants to power his one with five cells... it’ll noticeably pep two coats of thin dope. Use tissue for model's nose gear retract system, a up servo operation. The wiring of the color trim and numerals, and felt pen for Goldberg/Futaba combination, from a five-cell pack is exactly the same as coloring the struts and wheels. A light battery pack separate from the one used described for a four-cell one. coat of dope will fix the felt pen colora­ by his radio system. Good idea, and As to whether or not all servo ampli­ tion so it won’t run if your model lands in simple to do. fiers will stand the additional voltage, I the dew. Looking at the three wires coming don’t know. Many electronic compo­ Sixth, a single loop of three-sixteenth from the servo, you'll see a red, a black, nents are rated for the maximum recom­ flat rubber about ten or twelve inches and some other color. In the case of the mended voltage, but I really doubt if any long is the right power for the model as Futaba servo, the other color is white, are being used in the manufacture of shown. Wind it with an indoor winder and in all cases, it is the signal, or control our servos that the addition of 1.25 volts after lubing it with rubber lube. Have a wire. The other two are battery positive is going to cause a breakdown. I do helper hold your model while you and negative, red and black respectively. know that the R/C car boys successfully stretch the motor out at least three feet To run the servo from a separate battery, use Futaba and Novak servos in this at the start of winding. As you put in the you simply cut the red lead and connect manner, with no problems. Ifyou’veany turns gradually let the motor decrease in the end from the servo to the plus lead doubts, ask the maker of your servo, and length until the noseblock is in its of the additional battery. The battery then let us know. proper place as you finish winding. For a black or negative lead is connected in This is what I hope the column will beginner in rubber scale modeling, this parallel to the existing black wire. The develop into, a place to exchange ideas technique of stretching the motor will signal wire is left as is. Of course, you'll and information. So once again, I ask allow many more turns to be wound into have to have a switch in the circuit to that you drop a line and let me know the motor and give much longer flights turn off the additional battery when about the things you have wondered than simple hand winding of the pro- everything else is turned off, but even about, or would like to know more JANUARY 1982 89 posely put all the heavy wood in our kit, INTRODUCING THE NI-STARTER $19.95 Retail instead of spreading it out a little. All of them do it. Nobody produces an entire A new and completely revolutionary concept of power for run of perfect kits, but I’m here to tell glow plugs model cars, boats, airplanes, helicopters, you that Goldberg Models does not use anything using the 1.5 volt standard plug for glow engines. the heaviest wood in the kits. Back when Rechargable, (up to 1000 times). Rugged construction, fits I was building lots of VooDoo kits for in your pocket, works sideways or inverted, fits through Combat, I wouldn’t have said that, cowlings, heavy duty nicad power, many, many starts from probably, but a couple years ago, when just 1 full charge, uses New Head Lock plug adapter, the Falcon 56 was redesigned and being stays on the plug, not in the propeller. Instructions included. given the big push through the media This charger will charge 100ma & 250ma, 4.8 V. fit pks. types, I got one and that sucker arrived Over 50 consecutive starts without recharging. (40 engines in perfect condition... Because strapped & 10°o fuel) 90 day guarantee, after that, with normal - to the kit box, but under the wrapping, usage, we will repair or replace for S5.00 up to one full year. McDaniel R/C Service was a 1/2-inch thick piece of the See your dealer or call us — Bank cards accepted. C.O.D. 1202 Bryan Avenue strongest balsa I have ever seen. It was okay, you pay shipping. Distributor & Dealer inquiries Bellevue, Neb. 68005 about as heavy as a similar sized piece of invited. (402) 291-4287 base would be, just to give you an idea of why it didn’t make it to kit production. Instead of cutting it up and selling it to about. And certainly, if you’ve recently all the glue, resulting in a dry joint. This RCer’s who wouldn’t know the differ­ solved a perplexing problem, tell us all is especially true when laminating the ence, I kept it around. Never know how you did it. We’ve all heard i t . . . he ply to long slabs of balsa, as in making when the hammer might be lost and who flies crashes . . . but there are pre­ blanks for center ribs in Combat models. some nails need pounding. ventable crashes, and if we manage to If your last model fell apart because you Hmmm, did I already tell you that save one airplane a month someplace, missed that part of the article, please story some issues back? Truly hope not, all the effort will be worth it. don’t think I’m at all concerned, OK? understand that loss of memory pre­ You can write to me here at MB, or if THANKS, CARL... cedes senility... you prefer, direct to my home at 231 Name dropping time; Carl just sent WE WERE IN THE AREA... Cottage Place, Costa Mesa, CA 92627.· me one of his latest kits, this time it was This last summer, Wifey, the kids and I the Eaglet 50, a medium sized trainer. were on our way to Penticton, Canada, Make that RC trainer. So why mention it C/L ...... Continued from page 59 for what purpose I’m not going to tell in the CL column? Because I know there you and it doesn’t make any difference of years now in RC car motors, first year are a lot of you guys out there who like anyway, as the (previously) faithful van at a 7% mix, this year up a little to 8%, and to dabble in some RC on the side, it’s vomitted, repeatedly, through the radi­ with really exceptional engine life and usually better than taking a Sunday ator cap and we had to turn back when performance. I won’t go into the whole afternoon nap, even if not as exciting, only 100 miles from the Valley Of Things description of the oil, if you were going and if you are looking for an excellent To Do. But on the way up, just across the to try it, you would already have some. first model, maybe a step-up aircraft border, we had seen a very odd sight; What I would like is to hear from you from that 1/2A piece of foof you started that of a B-25 lumbering along, escorted guys who did try it, as I happen to know out with, the Eaglet is super. Instruction by some P-51’s,T-38’sandacoupleof jet some of you have it in your little hands. manual is without a doubt the best I have fighters that had everything hung out THAT THIN PLY... ever seen, including Heathkit style just to be able to keep the pace. At first A few columns back I went into a instuctions, commonly believed to be sight it was “ Look, kids, omigod can you description of some of the uses for 1/64 the best in the hobby field. Design is dig it, for-real 51 ’s,actually flyingalong!" basic and appears to be strong enough thick ply. When reading that column You have to understand that I have without being a hunk. Takes a .19 over again, and too late to change it, I always liked P-51’s and all the rest of the engine, although mine will find a basty realized that possibly I hadn’t empha­ WW-II fighters, just like you, but unlike sized strongly enough the gluing pro­ K&B .21 stuck in its nose, hard to break a lot of you, I have never seen them fly­ cedure. When using the newer instant that old habit of over-powering every­ ing . .. well, not in person, anyway. glues, like Goldberg’s Super Jet and Hot thing, you know. This took place on a Thursday, and Stuff Super “ T” , you should always put MORE ON GOLDBERG... the second thought through my head the glue on the ply and then join the When going through the kits on the was that there was only one possible parts. Ply-to-ply joints make no differ­ shelf, us picky types get even pickier destination for these creeky-fliers and it ence, naturally, but when gluing ply to when shuffling through the wood within had to be Abbottsford, well known for a balsa, applying the glue to the balsa and the pretty box. And quite often end up really good air-show presented each then joining might see the balsa soak up wondering if the manufacturer pur­ year. As the planes flew away and I once again had time to herd the van down the road, the idea of going to the air-show MOVING TO SOUTHERN CALIFORNIA? never occurred. Hey, I just don’t pur­ posely put myself in a situation where MAKE SURE YOU GET A HOME there are eighty jillion people all around WITH A MODEL WORKSHOP ! ! me, half of them in line for a cold drink, the other half in another line relieving FOR ALL YOUR REAL ESTATE NEEDS, themselves of the previously waited-for CONTACT: drink, and all of them in line ahead of ANITA NORTHROP me. But that was before the van threw up all over itself, serving notice that moun­ MLS tain passes were met to descend, not NORTHROP ascend. So, drawing a deep breath, I suggested that we go back 100 miles or [0 so, stay in a slime-pit motel, paying an Rea/ E s ta te outrageous price for said SPM. 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to salvage at least part of the weekend by we came away (early, just to avoid the light hammers such as the one pictured. going to the airshow on Friday. rush for the gates) very impressed with Strike the shaft with the hammer at the And it was fantastic! No wonder there what air-shows are today. Might even go point just above the last supporting are so many scale modelers around, at back next year and want to urge you to bearing as shown in the photos. If you least in RC. I mean, even I had fleeting, take in an air-show, the bigger the look closely, you can also see my refer­ very fleeting, thoughts about coming better, this next year. Your love affair ence mark to align the back of the shaft home and whacking out my very own P- with flying things is simply not complete “ up” . Give the shaft an appropriate tap, 51. Even using what must be very con­ until consummated by the big bang ... harder for severe bends, easier for slight servative power settings, those old of the after-burners on a low-flying bends. Reposition the shaft in the fighters rumble up and down the flight jet. · bearings and check to see what you did. line in terrific fashion, terrific enough to If the shaft just touches the screwdriver no doubt cause a few to flat pee their Choppers . . . . Continued from page 23 and the black mark is still on top of the pants, handily avoiding the need to shaft, you need to tap it again. If the stand in that ever-present line, or at least “ back” of the bent shaft. Remove the black mark is now at the bottom, you hit one of them. shaft from the bearings and place it it too hard, ease up. Generally you will Mixed in amongst the various show between two pieces of hardwood as find that the mark will vary a little bit routines were some guys flying micro- shown. This must be on concrete. Your from side to side, especially as you get lites, buzzing around like they were toy workshop floor will not do unless you closer to straight. It is much better to go model airplanes and causing the model- are in the basement. Even if you are in with slight taps and get closer and closer airplane-guy part of me to be thankful the basement there msut not he a rug or rather than one swat and too far. If the that there weren’t a bunch of Show carpet on the floor. The reason I stress a mark varies a little, simply position the Team RC types out mucking things up. perfectly hard surface is that the impact shaft on the blocks at the different Huh? Think about it, the Show Teams of the hammer must be directly trans­ place; the mark will not always be profess to be entertaining the air-show ferred to the shaft. If the surrounding directly on top of the shaft. Should the attendee while at the same time educa­ surface is the least bit soft it will give way mark be way off, yes, draw a new line ting this same person that RC models instead and the shaft will not bend as and proceed as before. aren’t toys. So they go out and fly trashy, desired. The examples in the photos As you get closer and closer tostraight, “ toy” stuff like flying barn doors, a flying were taken on a cloth for contrast only. it will be more difficult to get the shaft to Snoopy-Astride-Dog-House, a flying The choice of a hammer that you use touch the screwdriver for an instant. At witch on a broom, and the worst travesty will depend on the diameter of the shaft this point you might want to consider a of all, a flying lawn mower. And then you are straightening. The 10mm shafts "pointier” object, such as a sewing these RC guys wonder why people still in the Jet Ranger and Heli-Boy demand a needle, which will allow the best accu­ look at them as if they are just playing 16 to 20 ounce hammer. (I use the 20 racy, but makes it a little harder to see with toys... ounce for 10mm shafts.) Smaller shafts the gap. However, I did all of my indi­ Anyway, somebody had wisely chosen that are in the .40 size machines will use cating with the screwdriver pictured and not to participate, or more likely some­ 12 to 16 ounce hammers. Tail rotor shafts had no problems with it. body else had chased them away, and need to be straightened with relatively You will also feel the shaft rub the JANUARY 1982 91 indicator to check my model helicopter shafts. He agreed and I asked him how close he thought they’d be. He said I could expect to get within four to five thousandths of an inch (.004-.005). O f WHAT R/C BOOK the three shafts, I knew that one was “ really” straight, and one was out just a touch; but it was so close that I really has complete data about more than 2,100 didn’t want to tap it again for fear of making it worse. The other shaft looked to be somewhere in between these first different R/C products from over 250 two. (I had no idea what they would indicate, I had given it a good effort for a different R/C companies plus reasonable period of time.) The first shaft, which I felt was out just beginners tips by the a touch, dial-indicated a shade more than .003 thousandths out of perfectly R/C experts? straight. The second shaft indicated .0025 thousandths, and the third shaft, which I felt was the best I could do indicated .002 thousandths out. Then we IT ’S THIS checked four tail rotor shafts that I had straightened at an earlier date. One was YEARS EDITION out .003 thousandths, two at .002 thou­ sandths, and the best one dial-indicated OF THE less than one thousandth of an inch. Dave was impressed, and the results were better than I had anticipated. Then he asked me how I had straightened the shafts. I proceeded to tell him about the wood blocks and the 20 ounce hammer. He shook his head, looked skyward and laughed, half surprised and half dis­ gusted that I had used such a crude implement as a hammer to work on a helicopter. Oh well, this technique was never meant to be sophisticated, it was The only devised to get the job done with a minimum of means, and that it does R/C reference quite well. In conclusion, I’d go with this guide­ book you ever line for straightening main and tail rotor shafts. If you can see that the shaft is out really need. ever so slightly; you are probably be­ tween .003 and .004 thousandths out of straight. When you get close enough AVAILABLE THROUGH YOUR LOCAL HOBBY that you can’t see any perceptible movement, you are less than .003 thou­ SHOP OR SEND $9.50 ir.DS |tlu» $1.55 |χ»4ϋ£τ ami hainlliiif;. sandths out. Generally, I've found that when I have a "couldn’t get it better if I VA mmirnl» axM Y k salr* tax) tried” feeling about the shaft in ques­ R/C BUYERS GUIDE tion, it will dial-indicate at or less than .002 thousandths. This is the best we can C lif t·· House expect with the method presented, and it will be more than adequate for our Clift··, VA 22024 needs. I know that my rotor head fits on the main shaft w ith m ore than .002 thousandths play, not to mention the screwdriver or "indicator” for longer tackle the tail rotor shaft. The tail rotor bearing play nolding the shaft in place. periods of time. This “ feel” can be used shaft definitely requires a finer touch, Then when you consider main rotor to find the back of the shaft, even but I’ve straightened many and would balance itself, it will make much more though it is now practically non-existent. encourage you to attempt them too. If difference in vibration than a shaft out With the combination of sight, feel, and you feel yourself getting frustrated, put .003 thousandths ever will. And while it a little patience, the results can be very things away for the evening and pick it is nice to double check your work with a pleasing. (Yes, I’ll tell you in a minute.) up later. You must be evenly paced and dial-indicator, it is really not necessary, How much time you spend will de­ deliberate; one can not “ hurry up” this because the human eye serves as a pretty pend on your dexterity and feel for the type of operation. good dial-indicator by itself. proper tap. Last night I straightened OK, how accurate can you expect to Next month, a little more theory and three shafts in 30 minutes. Some will be? Well, after all was finished I took my then back to practical hints to improve straighten quickly, others become a shafts to my company’s helicopter me­ set up and flying. See you then. · little more demanding. I have straight­ chanic, Dave. Now Dave is an excellent ened main shafts with as little as two mechanic, most of the time very quiet Thornburg ... Continued from page 51 taps, but this is not a common occur­ and reserved. He takes pride in his work rence. I'd say that 10 to 20 minutes per and does things the way they should be receiver battery condition. Be sure the shaft would be an average time for done. I am very grateful for this, as I fly receiver is padded against hard landings, accurate straightening. the ships he maintains. . . Anyway, I had and the antenna is fully extended. Practice with the main shaft first, then asked him earlier if I could use his dial Check the wing hold-down dowels 92 MODEL BUILDER for strength. Give the towhook a tug... beginners have no idea how much tension a towhook sustains during a normal launch, or what a beating it takes Precision Tools in a normal landing. Flex the wing for strength, and check it for warps. Taps, open end Give the fuselage a tweak on your way wrenches, hex nut driv­ back to the tailfeathers . . . nothing so ers, phillips and alien embarrassing as a fuse that snaps in two drivers, and screwdriv­ during the launch. ers. The tools feature Check the empennage for alignment interchangeable or indi­ and rigidity. Are the hinges adequate? vidual handles and Tuff- Do they move freely, without arthritic Tempered tips. Pack­ creaking and groaning? Are the control aged in convenient molded plastic storage horns bolted down, and not merely cases. Send 25 cents epoxied to the surfaces. for complete size listing Somewhere along the line you ought and catalog. K & S En­ to check the controls under simulated gineering, 6917 W. 59th air loads, by holding the surfaces in your St., Chicago, Illinois grubby fingers and tweaking the xmitter 60638. Telephone: 312/ sticks. Soft pushrods, loose hinges, 586-8503. poorly mounted servos, reversed con­ trols, even weak batteries will show up under this test. I consider it the absolute minimum pre-flight that a beginner's plan should get. And you can do it without disassembly. Now’s the time to strap everything back together and check for warps, everyone does it. Remember, he’s very of a power pod. alignment, balance. Then on to the test excited, very impressionable. He may First, is the motor and/or power pod glide. just believe you. He may just acquire the mounted solidly? I saw a lovely big You know what to look for in a test habit of checking the controls before he Pierce “ Paragon" come apart in the air glide. Just keep in mind that a plane can launches. He may just become the only once due to a sloppily mounted plastic hardly be too noseheavy for a beginner. glider flyer in America who’s never power pod (it was just slipped under the Moving the balance point forward (and launched a plane with the receiver off! wing rubbers). raising the wing incidence to compen­ ★ ★ ★ The Paragon had climbed slowly but sate, of course) usually slows a model All these words of wisdom apply noisily (the vibration was awful) to a down nicely, and makes the elevator mainly to sailplaners. Power flyers seem couple of hundred feet, when it sud­ more docile for training purposes. Just to be more aware of the need to pre­ denly exploded. Wing, fuselage and because you’ve read Dr. Eppler’s com­ flight their models. Maybe that’s be­ motor all came down separately, none ments on center of pressure, and you fly cause more of them are full-scale pilots, under very good control. The wing was your own models back in the 39-45% accustomed to doing a pre-flight "walk- unscratched, except for some telltale chord range, doesn’t mean you should around” of their plane before climbing slices in the root, indicating that the pod trim a beginner’s model that way. into the cockpit. Or maybe the roar of had loosened and tipped forward just Now ... what to do about range­ the greasepots and the smell of the enough for the prop to take a few nips at checking the radio? This is a moral crowd tend to make power flyers a little the wing rubbers, and... dilemma of no mean proportions. Do more safety-conscious than glider folk. The second thing to check, if the sail­ you take the time (and energy) to walk Or maybe it’s because their ships are plane has a motor, is the thrust line. Not out a couple of hundred feet with the simply more prone to in-flight failure, that it can get you in too much trouble; transmitter and check the controls, like due to their speed and complexity and even a badly offset thrustline on a the radio instruction booklets say? Does vibration and oil and goo. powered glider will seldom prove fatal. anyone? O f course, you could do it, or In any event, the addition of a motor At worst you may have to hold a bit of have your beginner do it, while retriev­ to a model calls for a couple of additions opposite stick during the motor run .. . ing the hi-start. But who thinks of that? to our checklist, even if the motor is no big deal for an expert. But it w on’t Let’s face it, today’s radios seldom fail. merely strapped onto the plane by way make learning to fly any easier for your (If yours does, get rid of it.) So collapse the antenna, ground it to the box with your hand, and step away a few feet, Authorized- pointing the antenna stub away from the FA CTOR Y A UTHORIZED SER VICE model. If the radio works under these FOR ALL OF THE FOLLOWING BRANDS conditions, it will fly. (Am I being too •Radio blase here? I've flown the same brand of Ace* Kraft* Pro Line RS System»* (Qontrol Aero Sport World Engines Orbit Royal radio since 1973 . . . had 14 of them in Cannon EK Logictrol Mathes* Simprop* that time. . .andtheysimplywork. Every Cirrus Micro Avionics MRC’ Jerobee time. Even in my power planes. So I trust S e r v i c e them completely. If you have any reason •ALSO WARRANTY SERVICE to doubt the radio you're about to fly, then by all means range check it.) QUALITY SERVICE FOR ALL BRANDS VISA At last we’re ready for the hi-start. Now’s the time to start modeling good Don McCarthy Factory trained technicians with over behavior for your beginner. After you 15 years in Radio C ontrol Electronics. hook up, just before you launch, CHECK HOURS: THE CONTROLS. Point out to him ver­ Cloeed Sun & Mon — Tues: 10am-8 pm; Wed—Fri: IOam-6 pm; Sat: 10am-2pm bally that you’re checking the controls. Say, “ See, I’m checking the controls (714) 639-8886 941 N. MAIN ST., ORANGE, CALIFORNIA 92667 before I launch.” Lie to him . . . tell him JANUARY 1982 93 thing like an ice skater’s routine, in PRESENTING THE OCTURA which the movements between the maneuvers tend to enhance rather than detract from it. This is one element which seems to be improving in scale. As more flyable models and dependable equipment become evident, scalers tend to practice more rather than chanc­ Almost as quickly as you can say: “Swift-Switch" ing their competitiveness to the several CHANGE FROM A .60 TO A .45 ENGINE OR VICE VERSA rounds of flying at contests. One last WITHOUT REMOVING THE ENTIRE MOUNT FROM H U L L - thought on this subject would be to MERELY THE INSERT ON WHICH ENGINE IS MOUNTED!!! practice the figure eight. If there is one maneuver that gets blown away (literally and figuratively) it is that one. For those of you who might have or are considering a twin, might I recom­ mend one of the self-contained starter packs? There are several available at present which contain the sub-C size NiCds. I was interested in them at first because of the fact that there is no cord to watch out for. This is a definite advan­ tage for a twin or multi. I was a little concerned that the additional weight Features a minimum of parts. Strong, would be a detrimental factor. In fact, in light, extruded aluminum one-piece base many ways it is helpful, since the extra and one-piece insert. 5" wide. Inter­ weight tends to stabilize the unit. The changes with Octura 5-55 and 5-60 Motor (Engines pack holds a charge quite a while. The not Mounts. Ideally suited fordeep-veehuils. unit I am presently using is a Dave Brown Insert is deep enough to accommodate included) .65 engines. product. If you have access to the sub-C size cells from someof the self-contained Price:$16.00per assembly (incl. one insert). Additional inserts J 6 .00 ea. Inserts sized, drilled and tapped for the more popular marine engines:$8.25 ea. tools like hedge trimmers, etc., you can Order directly only if not available at your local hobby dealer — probably save a few dollars. add 10% tor postage: Illinois residents add additional 6% for sales tax. NATS 1982 The Oct. 3 meeting of the Nats Execu­ ~end $1 for ca ta lo g OCTURA MODELS, INC. tive Committee was held in Newark, and p rice lis t to. New Jersey, and included a trip and 7351 N. Hamlin Ave · Skokie, IL 60076 comprehensive tour of the site at Lake- hurst, some fifty miles south. The use of the site is being heavily promoted by a beginner, so you may want to correct it their flights, and we tried to mix them in very large group of individuals and clubs by trial and error during the first few various combinations, with contrasting on the Eastern seaboard. It has been flights. as well as similar types in the air together. quite an extended period of time since ★ ★ ★ It is pleasing to see this type of model in the Nats has visited the east coast and its That's about it for the Experts’ Check­ greater profusion than ever before. very high concentration of modelers. list, unless you experts can think of any­ For you competitive types, I had some The Lakehurst site, with its very inter­ thing else to add. The important thing to time to watch for a change at the Nats, esting historical background, is like remember is what a Very Big Deal that and a few things come to mind. It is many other possible sites, in that it shabby little first-model is to the begin­ interesting to note how many fellas presents both advantages and disadvan­ ner who built it. And how appearances stand in an awkward place while they are tages. The hope of those promoting the can deceive; a model that looks good on flying for the judges. The most common site is to see a possible return to the the outside may still contain some fatal error seems to be that they stand on the earlier days when everything was at one flaws within, if it was assembled by downwind side of the judges and then site with work areas to gather in to tell someone with little or no R/C experi­ proceed to block their view of both war stories and the like. ence. takeoff and landing. I can imagine that There are many things to consider in Don’t succumb to expert-itis. When a many judges find this especially frustra­ the selection of a site and the Committee beginner flatters you by asking for your ting when they have to lean forward and will have to weigh them carefully. Prime help on his first flights, don’t be too backward to try to catch a glimpse of the consideration, beyond the obvious quick to toss his brand-new model into model in action. I’m not certain that I flying site ones, include things like the air. First give it a good check, mate.· know what the very best place is in housing, available manpower, facilities, which to stand, but I know that blocking support of the site operators, etc. One the judges’ view does not constitute the thing certain is that very few groups or 1 to 1 Scale .. Continued from page 27 optimum. areas have ever expended more time going into Park administration and rec­ Some contestants seem to forget that and energy in developing their pro­ reation work at several of the Missouri the scale judge, unlike the pattern posals. There are other bids to host the universities. judge, is scoring the entire flight. Aside 1982 Nats, in c lu d in g the 1979 site, The interesting thing I noted was that from possibly blocking the judges’ view, Lincoln, Nebraska. there were a very large number of scale they may wind up forgetting the "total POTENTIAL PIONEERS models that I had to work into the pro­ flight” concept. While they may per­ Certainly one of the premier all-scale gram. These were not the “ look like form the individual maneuvers in a most events in the country has taken place at scale from a mile away” variety, but a convincing, scale-like manner, they fly the Falls of Rough (Rough River) Ken­ goodly number that have been or could the remaining portion as if it were a .40 tucky on the last weekend in April. In be competitive. They ranged from an sized hot dogger. Certainly while this 1981, seventy entries at the M int Julep .049 powered P-51 to a quadra powered should affect only the realism score, one flew the friendly skies of this beautiful Fleet Bipe. There were racing planes, can’t help wonder if it might not have an site in two divisions of sport scale and WW-II, twins, aerobatic, etc., etc. The overall detrimental effect on all elements giant scale. John Guenther, the M int audience was especially receptive to of the flight. The flight should be some­ Julep CD for 1982, has informed me that 94 MODEL BUILDER Q Get Your Flying off to a Super S ta rt for th e N ew Year...*»* *.. >****■, R ^ s t tion never to put up with hard starting engines again. Then look into Sullivan's Hi-Tork Starters. Choose from 2/5 hp to 1 hp, 12 to 24 volts to suit your engine’s requirements. And if you're into 1/4 scale monsters, there’s even a Sullivan starter for you. Each one is built to last. So get your aircraft off the flight line faster in '82 with a famous Sullivan Hi- Tork Starter.

Model HT a n d HTD, Hi-Tork 12V-Shown 4 Model HTD-24,SuperHI-Tork 12V % Model HTD-24, SuperHI-Tork24V Torque...230 in. oz. · Horsepower...2/5 hp w, Torque...288 in. oz. · HP ..1/2 hp f Torque. .570 in. oz. · HP...1 hp Free-Turning RPM. .4400 Free-Turning RPM...3500 ’ Free-Turning RPM...7000 Model HTD has aluminum cone and pulley In- ,y Startsalmostanyengineincluding ^ Starts most engines. 1/4 scale stead of nylon. Starts most engines including ^ many 1/4 scale engines. k monstersandotherbalkyengines. boats, helicopters, etc.

Take the JARS out of your SPARS with our LEVER ACTION And Don't Forget... Landing Gears (tail, nose and main). They’re modeled afterthe real Fuel Tank Systems, Push Rods and things for smooth, ground-hugging landings. Adjustable pressure, Accessories; Filtered Fuelers, Motor Mounts, Tubing, etc. by Sullivan. too.

Write for free 1982 catalog

W A R N IN G To All Modelers u l R i r t-*0 Not Near Overhead PRODUCTS, INC. 535DAVISVILLE ROAD · WILLOW GROVE. PA 19090 · USA (215) 659-3900 consideration is being given to offering executed with an exact scale mechanism Where the field has a single runway, FAI Precision and Stand Off to the doing the job. M ulti engines may have often narrow and short (our Gold Coast schedule. If this becomes a reality, help been an exception, as there is no other runway is 20 x 250 feet), the fast military has been offered by NASA to provide way to realistically award points if they models are often penalized. This is judges for the static portion and the run throughout the flight. Can you particularly true under cross-wind con­ computation. imagine talking about differential ditions where the light plane types can A secondary consideration which has throttle on that F-4?Andl never could get get off on the grass into the wind while been pursued with AMA would be to the engines in synch when I was flying the faster types have to use the runway utilize this as a practice session for our the Martin 8-26. regardless of wind direction (their 1982 teams. Such a session would help We stopped the category breakdown wheels will not hack the Florida grass). considerably in not only developing a at local contests several years ago for two For the above reasons, we have con­ cohesive atmosphere, but would allow reasons. First it would have been impos­ centrated on educating the judges presentations to be checked, and flying sible to support the three additional rather than trying to equalize the model critiqued. Hopefully, some of our Cana­ categories within the Sportsman-Expert types. I think that it is the way to go in the dian friends might be able to attend, to breakdown (as you pointed out in the long run although I will admit as you lend a truly international flavor. mag.). But more important, we found pointed out, it "ain’t" easy. AND IN CONCLUSION that the civilian models could and did As for limiting mechanical options, I A letter brings the following com­ compete well on their own. The differ­ have never used more than three me­ ments from top scaler and friend, Art ence was usually in the pilot and to some chanical options in a contest anywhere. Johnson. extent in the field conditions. Civilian With twins, this gives me one in addition Your most interesting comments in lightplane models have won the Tanger­ to the engines. I did have some second the October Model Builder triggered ine numerous times, and a guy with a thoughts about not using retracts as an this letter. I don’t think it w ill take fifty Waco biplane has made the military option out in Texas when I had four re­ years to get a meeting of minds on Sport models take a back seat at many of our tracting wheels with eight doors that Scale rules. It only seems that way. I local contests. Even tailskid equipped worked in the right sequence. I decided know I have made a 180 degree turn on WW-I type biplanes can compete suc­ that it was too complicated to explain all some of the ideas I had a few years back. cessfully with military option types as this to the judges, so I used flaps instead. For example, a number of years ago Don Srull proved when he came in There are rules proposals in to change we set up all the local contests in this second at the East Coast Scalemasters. the number of options allowed. I don’t area with separate categories for civilian, Field conditions can impact on the really care how it goes as long as the total WW-I, and military. The separation was type model that has a chance to win. In is not less than three. I do not think that a based more on the difficulty of flying south central Florida, there are no multi should get any additional mechan­ these models realistically in the wind model fields using full scale airfield ical options as compared with other down here than it was on the scoring of runways as at the Nats and the Mint models. mechanical options. For some reason, Julep. These large concrete areas make it Art has some very good points in his the judges down here never got the idea easier to take o ff and land the more letter, and it is important to note that he that they should give tens for mechanical complex faster models, while they are simply goes out and competes, has a options unless they were perfectly tough for a tailskid type light plane. good time, and doesn’t worry about

JANUARY 1982 95 the best U.S. Nationals contest perfor­ NEW ASTRO XL ELECTRIC SYSTEMS mance by a Junior in the "free flight soaring event” . We applaud this sort of DELIVER MORE POWER practical incentive for young builders, and await announcement of rules with WITH 8-10 MINUTE MOTOR RUNS. interest. System 1: ASTRO 035XL, $49.95 System 2: ASTRO 05XL, $49.95 CURTISS PIONEER AIRCRAFT BOOK This new lightweight system is perfect for New, long-running, six-cell system features Merrill Stickler, Director-Curator of many existing 1/2A kits that have too lit­ a high-performance, ball-bearing, hot-wind the Glenn H. Curtiss Museum, favored tle wing area to carry our Astro 05 system. motor that turns a Cox 6 x 4 prop at over us with a review copy of the recently The 035 system weighs only 9 oz. but can 13,000 rpm. Delivers 8 to 10 minutes of published volume CURTISS, THE HAM- turn a Top Flite 6 x 3 prop at over 14,000! solid power for 300-350 sq. in. sport or Perfect for the Jr. Falcon, Q-Tee, Flyline scale models, or over 1,000 ft. climb on MONDSPORTERA, 1907-1975, authored kits, etc. most two-meter gliders; Malibu, Wanderer, by Louis S. Casey. It is a pleasure to see a Drifter, Gentle Lady, 2 X 2 , etc. book devoted to one of the most fasci­ System 3: ASTRO 075XL, $89.95 nating and controversial eras in Ameri­ New, long-running, eight-cell system fea­ System 4: ASTRO 05 STROK ER, $64.95 tures a high-performance, ball-bearing, hot- New, long-running conversion kit features can aviation history. Apart from the wind 075 motor that turns a Cox 6 x 4 at a ball-bearing, hi-torque, 05 motor design­ remarkable Curtiss story presented in 14,500 rpm, or a 7 x 4 Rev Up at 13,500. ed especially for 1/10-scale off-road vehi­ the text, there should be particular Delivers 8 to 10 minutes of solid power for cles and a special eight-cell battery pack to appeal to modelers in the form of many .10-size sport or scale models, and over fit MRC Sand Scorcher and Baja Bug. De­ large-format, sparkling clear photo­ 1,000 ft. climb on 100-in. span sailplanes livers a bit more speed, lots more getaway graphs and some 36 three-view draw­ that are a bit too large for the 05 System. torque, and almost twice the running time of the original Mabuchi system. Leaves the ings. Some of the subjects almost cry out competition in the dust. to be translated into model form, and include flying boats, float planes, a -* Remember, all Astro Flight flight systems * * come completely wired, ready to run, and * couple of monoplanes, but mostly include motor, batteries, switch harness. biplanes, a fact that should delight Bill * charging jack, and motor mount . . . and * Northrop! (You bet! wen) * are warranted for one year. * If you have any interest at all in the RSTR0 FLIGHT me. 13311 BEACH AVENUE VENICE, CA 90291 strut-and-wire days, this book belongs in your archives. W ell-printed on good- quality stock, and comprising more than O ur New RUBBER STRIP 235 pages, it may be ordered in either FAI RUBBER. Made in U.S.A. soft-cover form at $10 or hardbound at Expanded SIZES: 1/4".3/16".1/8”,3/32", $19.95, plus $2 postage and handling, 1/16". by 1mm (.042") thick. from : Tne Glenn H. Curtiss Museum of MJaJn u nMODI a m LS ic BOXED 16 ounces o f rubber per box. Local History, Hammondsport, NY 14840. As usual, we'd appreciate your men­ C atalog PRICE: $1200 per box, postpaid tioning where you heard about it when in U.SA. R eady! ordering. NEW PIRELLI FREE FLIGHT GOLF? SIZES: 6mm, 3mm only, 1mm thick Golfing would seem to be the very offer the very Best in Scale PRICE: $18.00 per hank antithesis of model building (we have R/C Model Boat Fittings . . . (approx. 1/2 Kg.) heard there are people who sustain both Quality Fiberglass Hulls & Operating Accessories! TIMERS: KSB. Fuel & D T: $11.50 ea. hobbies, but we've yet to knowingly Our new 4ih Edition Dynamic Models' Catalog - plus 10% UPS. meet one). However, there is common 52 pages detailing Fittings. Hulls. Hardware Sol· U.S. Distributor and World Wid· involvement in aerodynamics, whether Now over 52 Pages $3.00 (refundable 1st order) ■ las. Sand 25* fo r 1981 CATALOG. the duffers know it or not. A golf ball is A#n S#u nMODI a mLS ic F. A.I. Model Supply subject to surprisingly complex factors P.O, Drawer C. Port Jefferson Station. New York 11776 U.S.A. O t PO BOX N S' TORRANCE CA90S10 during its passage through the air, just as are aircraft. Ross Atkins, sports writer for what the rules are. Live with them and imported imitations felt as though they the Christian Science M onitor, delved have fun. An excellent case in point had gravel in their gears). By striking into the subject at some length, follow ­ concerning Art’s letter is the success of contrast, the Mark 1 has a precise, ing the introduction of a radically new Cliff Tacie at the Nats and the Scale smooth feel which contributes to confi­ golf ball designed by the British Dunlop Masters. In spite of the lack of any me­ dence in winding. firm (which has also manufactured chanical options, Cliff simply took his An added convenience is the simple rubber for models, incidentally). Ac­ Citabria and flew it in a convincingly conversion chart molded into the rear of cording to Atkins, the seemingly simple realistic manner. The judges recognized the black plastic case, making easier the golf ball is available in some 169 differ­ a job well done and Cliff "Sleeper” Tacie task of converting turns-of-the-handle ent types, yet the search for perfection placed in the top five in both events. · into turns-of-the-rubber-motor (Most continues. of us have difficulty mentally m ulti­ The latest, Dunlop’s DDH "MAXFLI” plying numbers by 16). (also sounds like a modeling term!) was Hannan...... Continued from page 52 Intended for small models, the winder developed in England but is being good condition because of the fresh has an upper size rubber limitation of manufactured in the United States. water, and may be suitable for restora­ one loop of 1/8, making it suitable for Although most golf balls have fairly even tion. Peanuts and most indoor models. Priced "dimples” in their covers, the DDH has The official reaction? "The Navy has at $11.95 postpaid, the unit is available variously-sized indentations arranged in no plans to formally abandon any planes from: R.M.S. Tooling, 11370 El Dorado pentagonal formation. Rather than in Lake Michigan at this time,” accord­ Ave., San Fernando, CA 91340. Dealer concentrating upon sheer distance of ing to a quote in United Press Inter­ inquiries are also invited. Please tell 'em flight, Dunlop’s engineers worked national. that Model Builder sent you! toward achieving greater accuracy and MARK 1 WINDER ANNUAL AWARD FOR flight stability. The resulting dimple A new rubber-driven model winder is GLIDER GUIDERS pattern represents their efforts to create now available in the popular 16:1 ratio. According to the September, 1981 the best compromise in lift, drag and This should be an ideal replacement for Soaring magazine of the Soaring Society spin. The ball was also intended to the long-out-of-production Wilsons of of America, the organization has de­ erform well in the notoriously turbu- Cleveland, and Marlow winders (The cided to post a yearly award of $100 for E;nt air so often encountered in Britain.

96 MODEL BUILDER U.S. Golf Association regulations insist that all balls must conform to certain standards, including a minimum diam­ eter of 1.68 inches, maximum velocity of DELTA R/C Ruce Cats 255 feet per second, and maximum weight of 1.62 ounces. So again we see ♦ 1:8 World Champion Gas Super-J certain parallels to model aircraft rules, ♦World Champion Picco 21 Racing Engine which appear so arbitrary to outside ♦ 1:12 Electric Phaser 120 observers. ♦ 1:18 Electric "Pocket Rocket" The price for the new Dunlops? Try $22 per dozen. Wanna change hobbies? We manufacture the most complete line of gas R/C race car accessories. BAMBOO IS BACK Bamboo is an ancient and respected We manufacture competition oriented modeling material, but is seldom found 1:12 electric race cars and accessories. in hobby shops anymore. However, try Send $1.00 for catalog package your neighborhood food market! DELTA Mfg., Inc. "Skewer Sticks” will yield fairly large sizes at low cost, and we’ve just dis­ 27 Racecar Court, Lorimor, Iowa 50149 covered "Bamboo Sandwich Picks” , USA______Phone: (515) 763-2220^ priced locally at only 59 cents for a package of 100. Each pick is about 4 inches long and approximately 1/16 in FAD-1 “ SKYRAY" diameter. Just the ticket for rear rubber Ducted Fan CURACAO M0D6LB0UW motor pegs and other highly-stressed DOUGLAS "SKYRAY" NAVY MO-1 components. Designed by: Bill Effinger A Γ Scale Ducted Fan R/C design lor the Plan Set RRCDF-1 AND SPEAKING OF MATERIALS RK-20 Ducted Fan unit. 44" length overall at $19.95 Ever notice how many products these (Add S2 00 for Rolled Plan in Mailing Tube) days are being advertised as being made W.E. TECHNICAL SERVICES. Boa 74W4B AHonlo. GA 3032· of "Spage-Age Materials” ? After due SIGN-OFF consideration and examination of some Recently the UP WITH PEOPLE show of them, we have reached the conclu­ featuring young entertainers from vari­ sion that their only relation to space is ous parts of the world, performed having been manufactured at some time locally, and we had the pleasure of since Sputnik was launched! attending. During one of the production WHATEVER HAPPENED? numbers, we caught this line: “ If God We’ve noted that some fascinating had meant for us to fly, he would have items appear in the modeling press from given us ... credit cards!" · time to time, never to be heard of again. Some of these "breakthroughs” must have resulted in some progress or useful Sport Scene .. Continued from page 50 results, yet additional information has not been forthcoming. Three examples oversized piece to fit the item to be spring to mind: Really tiny R/C systems. covered. This is not too easy with scissors. Every so often one readsof small rubber- It’s better to lay the mylár on a rug and powered indoor models with electronic the item on top, and mark the mylar with guidance units. But, production ver­ a felt tip or grease pencil. Then cut on sions, or even practical construction the line with a sharp razor blade, (Jim articles about them are conspicuous by lones to the rescue! L.R.) their scarcity. Why? 2) Now coat the edges of the item to * Authentic Sails and Fittings Round rubber. Some years ago, one of be covered with contact cement. If it is a Complete catalog showing modeltypes of· the international Wakefield teams (Hun­ wing, also coat the tops or bottoms of handmade oldtimers and pricelist will be gary, possibly?) powered their models the ribs. Let the cement dry completely sent to you on receipt of USS 4. - to cover with highly-touted rubber strands of (use airgun to help if you want). airmail charges (refundable with order). round cross-section. The claim was that 3) Now get your hotshoe ready and inter-strand fric tio n was greatly re­ position the covering over the frame to CURACAO MODELBOUW duced. Sounds logical enough. So what be covered. You’ll find that touch pres­ c/o Fred A. Engelage became of it? In France, there is a sure w ill usually cause a little adhesion 2613 Golf Drive, Palatka. FL 32077 popular paddle-ball game called Jokari where the cement is, but don't worry if it Phone: (904) 325-5005 which utilizes round-section rubber, doesn't. By touching your hotshoe to and a few enterprising model builders the covering, the contact cement below have tried it for power. Results please? it is immediately softened and sticks. lower heat and shrink as little as possible. Terraced wings. Turbulated wings 4) In fact, as you may have guessed, Several finishes work well. For non­ come and go on the aeromodeling you can now treat it Just like Monokote. gas small models where fuel proofing scene more or less regularly. But how Seal around the edges and shrink the isn't required, Floquil model railroad about the much more radical terraced middle . . . preferably with an airgun. paint is outstanding in low weight, wing. They have been tried on full-scale The result should be a taut, mirror coloring, drying, etc. As a fuelproof aircraft, and long ago, Larry Conover covering that reflects your image. paint, at present, my favorite is a latex- worked in conjunction with Dr. Lippisch I haven’t mentioned the hotshoe heat epoxy paint sold in paint stores called "4 on deeply "stepped” airfoils. Was it a setting, but it isn’t critical. About the in Τ ’. I’ve also found that Alkyd-Epoxy dead-end idea? Parallel thought: Dr. same as M onokote for most models, if and Polyurethane colored paints work Julian Wolkovitch points out that certain not a little bit more. I use an iron set on pretty well, though they dry slower. I insects are anything but smooth, and in ’cotton’. But you’ll know it when it’s too haven’t yet tried it, but I’m pretty sure some species a re down right hairy. Surely hot as the aluminum tends to turn dull that auto lacquers would work well. Also M other Nature must have had a reason. with pearl-shell like color bands and if it is likely that some sort of primer would How about trying a felt-flocked hand- hotter yet, w ill develop holes. For cover­ allow the use of dopes. launched glider? ing fragile items that might warp, use Bob certainly has done his homework.

JANUARY 1982 97 LEISURE FLIGHT SYSTEMS MORE POWERFUL THAN AN ASTRO 5 WITH TWICE THE FLIGHT TIMEI • Flight time of up to 13 minutes in a Kraft Cardinal. • Fantastic climb performance in powered Sail Planes · Goldberg Gentle Lady Midnight Models' Electrolite Craft Air Drifter Marks Models' Wanderer • Excellent performance in Sportscale Shoestring · flies 7 minutes and does the full AMA “ A” pattern. • Full AMA “ D” pattern including inverted flight, outside loops & vertical rolls with Midway Models Fast Eddie Racer. LEISURE ELECTRONICS Send SASE for information. 11 Deerspring, Irvine, CA 92714 Sportscale Shoestring, 4 channel, weight 34 oz. Ph. (714) 552-4540 His address is 56 Cathrine St., German­ Stewart took my none-too-subtle hint town, Ohio 45327. The one thing he and sent some black and white photos of didn’t mention is a source for the thin his high performance .049 powered bi­ COVERUP! mylar. I have called around to plastic plane. As you see, this magazine just supply houses in the Los Angeles area can’t resist publishing those cutie girlie Sturdy, high quality, rich dark with no success so far! DuPont, of pictures! For those of you who joined us green vinyl-covered binders for course, wants to sell it in huge amounts late, Harry built this model to fly in his your valued copies of MODEL only, so you need to find a commercial yard on calm evenings. It has aileron, BUILDER Magazine. Gold let­ user who will let you buy a portion of his elevator and throttle control. Great tering on spine and front cover. order. The NFFS supply used to sell the performer. stuff, and so did Satellite City. Just as an Next you see a balsa stripper doing its aside, mylar is made in thicknesses down thing. Master Airscrew has grown to be to .00006. one of the larger producers of propellers Moving on to the response by Ron St. for our hobby. In addition, it is branch­ Jean, we got not just a new covering ing out into accessories which fit in with material, but a complete new construc­ its available production machines. The tion technique. Ron has started a side­ stripper you see here is incredibly better line business called “ Structureless Foam than the old X-Acto devices which were Composites Co.” The address is 3744 East supposed to guide your knife. The e t f Nye Lane, Carson City, Nevada 89701. Master Airscrew device holds an X-Acto Ron has spent the last three or four years #11 blade directly and solidly in proper developing techniques for building alignment. It features thumbwheel wings, fuselages, and complete models screw adjustment to control the width of with bead foam, cut or carved to shape, the strip to be cut. Oh boy,does itw ork! then covered with white glue impreg­ Unless you are into building FAI indoor nated silkspan, and covered with Saran microfilm models for international Wrap. Ron has spent considerable time, competition, this is the stripper to have. money and effort in perfecting his If you are building FAI microfilm models, methods and has written an excellent you can get a dual micrometer con­ small book on the subject. You can trolled stripper from Ray Harlan for One Binder...... $5.95 order the book from Ron for $10 plus $3 about ten times the price of the Master Three Binders . .. $15.95 for shipping and handling for each Airscrew unit (that is still cheaper than a Five Binders .... $25.95 order. He also has the covering material, large R/C engine). kits, discounts on engines, and does (For more than 5, include Next item is by professional artist and custom foam cutting. Send a SASE to $5.00 for each additional modeler extraordinaire, Jim Newman. Ron for his price and catalog sheets. Hello Larry! binder.) Ron sent me his book. It is very com­ Since you seem to be somewhat Shipping: Binders shipped in U.S. plete. He has the basic "How-To” nomadic in your habits I thought I had by UPS only. For one binder, add followed by "W hat-lf” and trouble better address this c/o MB in case you shooting sections. He also outlines some have switched address on me again. $2 00. For each additional binder, experimental blind alleys to avoid. The Just to show you that in spite of busi­ add 75i For binders shipped out­ book is clear and well written. The ness demands, a prolonged attempt to side U.S., add $3.50 for one bind­ essence of his technique is to cut and build a 'homebuilť, and a garage under er. For each additional binder, add sand a foam core, then start building up construction, I still manage to do a little $1.50. For A ir Mai! rates overseas, a skin of silkspan on it with white glue for building! Notice I said “building" with please inquire. a bonding and filling agent. Several no mention of flying.. . Actually I have layers may be used in critical areas. Ron managed to get in a little stick time with PLEASE . . All payments in US funds only then discusses several techniques for my 100 inch R/C sailplane on contest finishing models, and the relative merits. Sundays, but little else. Good stuff! I would welcome any addi­ Anyw ay. . . in answer to your appeals tional concepts or experiences with (or material, I felt I had better keep faith MODELS* lightweight films that you readers might with the public and show that I do still have. I would very much like to thank wield the sandpaper now and again, and BUILDER Jerry, Bob, and Ron for contributing in case you did not recognize it, the 621 West Nineteenth S t, Box 335 their ideas and taking the time to write. subject is the Piper L -4 .. . the very same Costa Mesa, California 92627-0132 PHOTOGRAPHS L-4 which appears on the label of the I am happy to report that Harry latest Midwest release, since I designed

98 MODEL BUILDER the ship. I have not been in the employ of M id­ west for nearly three years, now (M y! How time flies) and the I-3/L-4 foamARF was one of the last models I designed for them before I quit. However, in keeping with the best Frank Carcher traditions, he only got around to kitting it last RCH December in spite of the vast investment in tooling for foam moulding. When they finally got rolling Ed Rogalla, Pro­ duction Manager, was courteous enough to send over a set of mouldings for my ANNOUNCES perusal. Naturally, as a scale freak, I THEIR COMPLETE LINE OF PERFORMANCE could not possibly do the overdone )-3 and had to convert it to an L-4 by simply ACCESSORIES FOR sanding out the window engraving and TAMIYA OFF-ROAD VEHICLES painting as appropriate. As you can see (I NOW IN STOCK FOR IMMEDIATE DELIVERY hope) from the print, in spite of being a “ foamie”, it is fully detailed and weath­ Aluminum Wheels - Brass Gears - Dual Shock Mounts - Skid Plates ered with the appropriate rain streaks Special Torsion Bars - Aluminum Chassis - H D Steering and Normandy mud splashes. You might also detect my Piece o f Resistance . . . Available From: the opposite side structure normally HOBBY MARKETING visible through the green house is care­ 6S7 West 19th Street fully airbrushed on to each side as also Costa Mesa. CA 92627 are the crew members with the rear man busily calling the artillery falls into his Dealers & Dstnbutcxs inqunes welcome (714) 646-9273 "m ike". You might also be able to detect the scale type fully steerable tailwheel complete with tiny springs and leaf FLYING SCALE MODELS spring attachment. As you can see, I am still struggling [factor H A R l)\V A R E with my photography. Perhaps when I • WORKING TURNBUCKLES get my darkroom I might be able to work • RIGGING & CONTROL CABLE some of that magic the experts seem to s,· CONTROL HORNS r—^ Λ ‘ have available. One thing I hate seeing • STRUT FITTINGS in photos of scale ships are all the • SHOCK CORD control surfaces nicely in alignment! •COCKPIT TRIM How often do you see that at the local • P U L L E Y S airport? Invariably the elevators droop "NEW " SPARROW HAWK F9C-2 (3 stoat*! ...... $ 2 1 .5 0 • INSTRUMENT HOUSINGS and the ailerons are deflected, and, in 1/4 seal· R/C 78-1/2" span GRUMMAN J2F-6 “DUCK" (4 stoats) ...... $ 1 9 .5 0 taildraggers, the tailwheel is often 1*1/2“ tea la R/C 58" span skewed as the pilot executed that last V O U C H T O S 2 U 1 8r 3 K IN G F IS H E R ...... $ 1 9 .5 0 Eojinlarmatipn and catalogue, (4 sheets) 1*3/4" scale. 63” span send 1 1.PQ to snappy turn as he parked. So ... I tried G R U M M A N " G U A R D IA N " A F - 2 S ...... $ 1 7 .5 0 13 sto a ts) 1*1 /4 ” scale, 7 5 " span Doctor ENT. CORP. to do likewise. AOdS2.00htrHtung 8, p o tt*f P.0 BOX 9641 Back to the L-4. Span is 45 inches, with Brochure 5Ot SMITH PLANS SAN 0IEG0.CA.92109 290 square inches. Weight is 36 ounces 9422 N. Fairway Blvd . Sun Lakas. AZ 85224 and power is an elderly Cox .09 which is ideal for it. My version, of course, is side mentioned in a previous column, up­ mounted, but the kit model has an Before closing, Larry, I must make one dated its sport/trainer series of aircraft. upright installation. further comment on the various Cubs The flagship of that fleet is the "Head­ I had an interesting and very human seen in the past. For some reason, master Sport 40". This model is the happening with my L-4. A few weeks modelers seem to lose the character of Cadillac of trainers, with capability to back our club, the Midwest Sundowners the little Piper when it comes to the handle up to a .60 engine and using 4 of Chesterton, Indiana, held a big model landing gear, and even a champion like channels as standard. It has been a suspi­ show at the Southlake Mall in Merrill­ Bob Nelitz, of Canada, seems to have cion of mine for some time, that the only ville. A couple of days into the show I lost it with his superb 12 foot version. In reason to fly rudder rather than aileron received a phone call from a very spite of the ready-made aluminum gear control is the slight extra hassle of carry­ emotional and elderly gent who had which I specified for the kit, I think I ing the control linkages out into the seen the L-4 and recognized its markings have managed to retain that elusive Cub wing and hinging an extra surface. It is as being from the squadron which oper­ stance . . . and I am sure the fat little my opinion that most models fly much ated in Normandy just after D Day, 1944. Trexler airwheels I use have a great deal more smoothly and positively under He was absolutely overcome because he to do with it. aileron control compared to higher is convinced, from snapshots in his Carry on with that excellent and dihedral wings and rudder. Unless you possession, that he had flown that very absorbing column . . . it is just meant for are flying a powered glider, you can’t same Cub on several occasions until fellows like me. hope that an inherently stable model someone Tree’d it. Small world! He con­ Very sincerely, jim Newman. will self stabilize in time to save you, so firmed that my " Battle Stains" were Oh yes, in addition to doing model you fly the model all the time anyway. authentic and thought that the model designs and professional graphic items, Having a model which responds switfly could have been even muddier, since )im draws an excellent “ hints for mod­ and surely to commands is much more they operated from strips which were elers’’ column for MAN. Oh well, at least of a security blanket than having a self­ more often than not, totally devoid of he knows the best place to send his stable model which is fighting you in grass due to the vast amount of vehicular model photos. turns and zooming up out of turns. traffic in the battle area and the constant Final model for the month is rather (Can't agree with this, Larry. You've European rain which did the runway a largish for the usual scopeofthiscolumn, forgotten what it’s like to be a raw great unkindness. but really fits in well. Top Flite has, as I beginner who can use all the steady-as-

JANUARY 1982 99 ATTENTION V4 SCALERS ted. Cut a piece of 1/16 sheet for the lower part. Taper the last 3/4 inch in EPOXY GLASS COWLS FOR: thickness. Glue to the ribs and spar using NOSEN PICA SID MORGAN BALSA USA PLATT CONCEPT f l e e t m o s t e t l e b r c m t c r a f t s h e be r p it t s ·/, a % a piece of trailing edge stock to hold up s c a l e s u p e r c u b f o k k e r d t Bo e in g p 1 2 p -26 F4B2 the rear. Cut 1/16 sheet for the upper F4B4 SPARROW HAWK GEE BEE MOO Y MACBRlENS TURBULENT CHRISTEN EAGLE BRIS/Gh ELLA S STARDu STER part and glue in place. The wing center II '» SCALE J 3 B I BABY FLYBABY AlRCAMPER PILOT JUNGMANN I 3 5 SCALE b OTHERS section should be allowed to dry thor­ oughly on a flat board. Any twist built in WHEEL PANTS FOR: CITABRIA STARDUSTER II PITTS SKYBOLT LIBERTY SPORT at this stage will be very difficult to re­ CHRISTEN EAGLE P 6 E HAWK STEARMAN STINSON SR 9. move. The elevator is built later after the MULLIGAN b OTHERS wing is removed. BRAZED & HEAT TREATED WIRE GEARS ft CABANES The rudder and fin can be built now. It LARGE SCALE PLANS AVAILABLE is a basic flat plate of 1/2-inch thickness. Send SASE tor latest list The trailing edge is tapered and blocked We supply Modelers with fiberglass parts for your up from the building board by the forms plans— Write or call us shown. The structure is aimed primarily T & D FIBERGLASS SPECIALTIES at keeping the wrinkles out of the cover­ 30925 BIOCK GARDEN CUV Ml *8135 ______PHONE (313) 421-6358 ing. The 1/8-square spruce prevents the root rib from bending up in the middle. body can be used if tow launching is not The prototype has a removable vertical going to be used. I have found that tail. This allows the model to fit into a having the two hook close to the bottom box about 38 x 22 x 8 for storage and of the wing improves the launch stability. travel. To make it removable, an alumi­ Ballast tubes can be added to the wing num tube was added to the back of the center section if desired. I intended to leading edge located as shown on the install KDH speed brake/spoilers, but plan. Two 4-40 anchor nuts were added couldn't locate a set before I completed to the 1/4 X 1/8 rear body post. The 4-40 the model. screws were countersunk into the rear CONSTRUCTION fin spar. The spars are slotted and hinges (A complete parts list is included with fitted. They are pinned in place. The the full-size plans.) hinge pins are removed and replaced by Start with the wing center section. I a long 1/32dia. pin through both hinges. prefer cutting all the ribs first. All spar Remove the wing center section and material is of a slightly different size, to build the elevator. It is built upside make sure the notches in the ribs match down on the plan. A small strip of 1/16 is your wood. Choose a hard, straight 1/2- placed down first to give it a curve. The inch triangle for the leading edge. Cut top 1/16 X 3 X 24 is pinned to the board the rear 1/16 off the triangle, so the and the 1/16 x 1/2 spruce or ply added. rheeting will butt against it squarely. The 1/8 leading edge is fitted and glued Then remove the front (15/64) as shown in place. Add the ribs. Place a scrap of a-rock la b ility he can get from his first on the plan. Place it on the plan, making hard 1/8 between the center ribs as R/C aircraft, wen) sure it is straight. Fit and glue a sheet of shown on the plan. Size the lower skin Thought for the month: Anything 1/16 X 4 behind the leading edge. Put the and taper the last 3/4 inch to fit the top worth doing is worth doing to excess 1/16 X 1/2 sheet lower rear spar in place. skin and glue in place. Be sure it is dry (the Renger family motto). · Fill in the lower sheeting in the required before removing from the board. areas. Use the ribs and locate the lower Shape the leading edge of the center main spar cap (1/8 x 1/2 spruce) on the wing using the template as a guide. The Raven...... Continued from page 19 lower sheeting, gluing it in place. Fit the next step is to separate the center wing This model can be customized to your ribs and glue. Assemble the 1/8 vertical from the outer stubs. I used a Dremel jig local conditionsor requirements. I don't grain webs,and glue. All the joinertubes saw with a fine tooth blade. Mark a expect that you will need a lighter should be roughened for better epoxy straight line between the ribs and follow model, but it can be done for special and glue adhesion. Fit wood below the it with care. Take it easy and you can cut uses. A one-piece wing will save around joiner tubes, epoxy the tubes in and add through the brass and aluminum tubes. 5 ounces. The wing spar is oversize for the wood over the tubes. I prefer the This will give you a perfect match winch loads, and the body is strong for square tubes as they glue into the struc­ between the two panels. spot landing loads. A savings of 10 ture easier. Locate the dihedral braces in You are now ready to build the tip ounces should be possible for an electric place and glue. Now the upper main panels. Warning: The stock 1/4-square powered model before the motor and spar cap (1/8 x 1/2 spruce) can be glued leading edge hangs below the level of batteries are added. Most places have in. Add the cap locks of 1/16 ply. These the building board. Place the plan on the more severe conditions than here in keep the caps from separating under building board so that the first 1/2-inch Southern California. A heavy duty ver­ high loads. The upper leading edge skin is off the edge. Fasten down the lower sion, including complete sheeting of the should be assembled on the board to main spar cap (1/8 x 1/4 spruce). Epoxy center section with 3/32 balsa, and the provide a width of about 4-1/2. Fit it to tip parts to the stub. Fit the ribs and glue tip with 1/16 balsa, should be feasible the top of the leading edge triangle as in the parts at each step. Add the two and within reasonable wing loadings. shown on the plan. Use a slow drying 1/8-square spruce auxiliary spars and The prototype turns easily with 20 glue to fasten the upper skin in place the 1/4-square spruce leading edge. degrees of rudder each way. With 20 from the leading edge to the main spar. Assemble the 3/32 vertical grain web. degrees more available, the extra tip Fit the 5/16 x 1/8 rear spar between Fit the upper spruce 1/8 x 1/4 spar cap. inertia should not cause a problem. This ribs number 14. Outboard of rib 14 the Add the trailing edge, using a piece of would be a very sturdy model that will spar is between the ribs. Assemble the trailing edge stock to hold it in place. be at home in strong winds or on the joiner tubes and spruce spacers with Add the corner gussets. Construct the slope. The body size and shape has very epoxy between ribs 13 inner and outer. other panel. Add the tip ply cap ribs. Fit little effect on the stability, so it can be Make sure the top of the spar does not the ply cap ribs at the wing joints. Trim changed for special purposes. A longer stick above the ribs. Glue the upper 1/16 the lower parts of the 1/4 square leading nose would be required to offset the X 1/2 rear spar in place. Now, fill in the edge to the rib shape and round the increased weight behind the center of sheeting between the spars. The trailing front. gravity for the sheeted model. A deeper edge aft of the rear spar is now construc­ Time to construct the body: Cut out

100 MODEL BUILDER the sides. The forward part is three-ply mahogany plywood which can be ob­ tained from a lumber yard in sizes up to 4 X 8 feet. Mahogany plywood has many uses and is relatively inexpensive. The rear is of 1/8 balsa. Clue the forward and rear parts together using the wing cut­ out as a reference line. Cut out the nose MIDWEST block, tapering the sides as shown in the top view. Clue the sides to the nose WARDCRAFT OFFSHORE MODEL SUPPLY block and make sure it is set before 44" - 38" - 33" - 31" bending the sides. Add the 1/8 x 1/4 No finer racers anywhere spruce upper stiffeners and the 1/2 S up p lier, C-X Record Holder 'T o u r triangle lower corners. Cut frame 6, a 1/8 Not Your Competitor" X 1/4 spruce or ply rear post, and a small WARD MARINE CORP. block 1-3/4 inches long. Bend the body P.O. Box 2579 Lynnwood, WA 98036 • Stocking over 150 sides around the block which is placed Frank Ward Dealer Inquiries Invited. lines of merchandise about 6-1/2 inches behind the nose. Days: (206)543-6534 • Fast service to all parts Glue and clamp at frame 6. Cut a notch Eves: (206) 775-3969 of the USA and also on and add the 1/8 ply tow hook mount. foreign orders Then cut out and add stiffener B. Com­ vator horn and epoxy in place. It should • Special cash discounts pression strength is needed here be­ be off center slightly toward the side of cause this is the area that you hold the rudder horn. Add frame 3 ahead of up to 10% during launch. Mount the adjustable the wing. Install upper body sides and • Freight allowances up to 5% tow hook. Add the cross-grain 1/4 body frame 9. Add 1/8 square corners at this • New Golden Dealer program bottom. With a felt tip pen draw a time. • Weekly mailer centerline on the upper and lower wing Cover the outer wing panels. Cover surfaces. Add stiffener 7 to the wing. Fit and install the vertical tail if it is remov­ • Phone orders encouraged the rear post, taking care that it is per­ able. Install the outer wing panels. Place DEALERS ONLY the battery in the nose. Mark 3.8 inches pendicular to the wing. Add the aft CALL US AT 312-759-1955 bottom 1/2 inch balsa. Drill and tap for on the sides of the body behind the wing

the skid. If the wood is soft, it should be leading edge. Put your servos and re­ MW 7791 strengthened with glue on the threads ceiver in the body to balance the model and retapped. The nylon screw makes an at the mark. If the model is tail heavy, MIDWEST MODEL* I excellent skid and can be replaced if add ballast to the nose block or lighten worn down from landing on rough sur­ the tail. If ballasting, put it inside the v^fljpnaaiiaa faces. Fit frame 1 and add the upper aft nose block. Install the servos, making v ν ' ,” 4nui " * Vo n Th· A FVU. LINE MODEL DISTRIBUTOR nose block, shaping it to frame 1. Shape sure the elevator pulls for up. Remove SERFINC DEALERS FOR OVER 30 YEARS the inside nose to take the battery the construction block. Complete the snugly. Carve the outside lower corners radio installation and assure yourself to a rounded section. It can bedone with that the elevator and rudder move within the limits shown. If M.B. Raven is a model knife or belt sander. The next enough. Add the body top from the C.G. nose heavy, the elevator does not have step is to mount the wing. However, I to the rear. Carve the corners to a enough power to keep the nose up. If it think the lower body should be filled rounded shape. is tail heavy, the center of gravity is too and sanded ready for the final color A tricky little area is next: This is be­ close to the neutral stability point, before attaching the wings. It can be tween the C.G. and frame 3. I wrapped causing erratic flight. If the center of fiberglassed at this time, if you desire. flexible 1/16 around a subframe attached gravity is 3.8 inches behind the wing Cut the wing rods of spring steel. All are to frame 3 and 1/16 smaller. This 1/16 leading edge, the elevator should be set just under 6 inches long. Two are 3/16 was copied from a paper pattern that to trail with the rest of the wing. This will diameter and two are 1/8 diameter. was made by the ‘cut and try’ method. produce a fast glide with a very slight Draw lines representing the sides of This area can also be constructed with stall. the body on the top and bottom of the small, soft balsa blocks. Put masking tape Please be careful that the batteries are wing. Cover the wing center section up on the wing surfaces next to the body. fully charged and make sure you do a to the body sides and install the covered Fill and sand the upper body. The range check. No sense destroying a elevator. I use clear Monokote as a canopy cam be made now (I sawed mine model because of an oversight. If any­ continuous hinge on the upper side. from a soft balsa block). Hollow it to thing appears to be wrong, don’t fly until Regardless of the hinge used, this joint clear the equipment. Carve the outside it is fixed. If all is ok, turn your radio on, should be sealed. Iron it on with the to a rounded shape using frames 1 and 3 check the control movement, and elevator in the full down position. This as guides. It can be painted or covered launch into the wind with a strong level will give enough freedom after it shrinks. with Monokote. The body can be throw. Adjust the controls to obtain a Turn it over and add one inch wide strips painted now with its final color. steady glide. It is much easier at this at the ends, midpoints and center. This Use your own method of holding the stage if you can have a friend launch for prevents the elevator from moving canopy on. I prefer to tape mine, for I you. This allows you to have your hand vertically when the horn is loaded. have seen quite a few batteries come out on the controls at the time of launch. Be Attach the wing to the body. Use epoxy during maneuvers, with the expected ready! This type of model responds and make sure stiffener 7 is glued to the results. Check the center of gravity to rapidly in pitch. When a good glide is body. When this is dry insert the fin make sure that it falls in the allowable obtained, observe the position of the leading edge between the body sides. If range. Set the two hook about 1/8 inch surfaces. Adjust the push rods to get this it is to be removable, drill two 4-40 holes ahead of the center of gravity for a start. position with the trim and stick at in the fin rear spar and the rear body Install your favorite skid and you are neutral. You are now ready for your first post. Install anchor nuts inside the body. ready to fly. winch, hi-start, towline, or slope launch. If the tail is to be fixed in place, it should TEST FLYING I don’t recommend your first launch to be covered before fastening. Make sure Before test flying, the model must be be in a strong cross wind. After you are it is perpendicular to the wing. For the in balance both longitudinally and later­ familiar with the model, wind direction removable version, saw through the ally. Although lateral imbalance can be shouldn’t bother you any more than leading edge and tube 1/8 above the trimmed out, it is drag producing. You with a tailled plane. Be sure the winch body sides after it is dry. Cut out the ele­ must have the longitudinal balance line is tight before you launch. Note, I JANUARY 1982 101 over and rotates the plane around to the SlMI SCAll J910 RUMUOUT\ opposite direction. If the up elevator is NeW·' PONY-BLIMP Il- H . * « 0 1 0 COMIROILID MOM-RIGID AIRSHIř released as it rotates, it will accelerate PRACTICAL 51Z £ Can Llh 28 O*.; Use Standard Radio· (3 or 4 Channel); Require· only 80 out in gliding flight. Note, this can’t be Cubic Ft. of Helium (Helium Available done with a tailled plane. at Welding Supply Shop·). Before attempting dives, let me offer a FULL C0KTK0L Modern Thru·!·Aerodynamic Control — Forward. Hover. Backward. Elevation. suggestion. This plane is hard to see Turn. Ballast. Helium Release coming down, especially toward you. COfAPUTi KIT Formed Plastic; Die-Cut Balaa and Position the model a hundred or so feet <940 Art Plywood Parta; Mounting Hardware; ' * Wire. Plug·. Switches. Book Explain­ from directly overhead. Then make a ing Blimp Operation. Detailed Plans diving turn around your position. This and Many Photos. Completely Fabri­ allows you to have a good view of the cated Vinyl Helium Envelope. (Electric Motors. Radio and Battenes altitude and attitude. A tight elevator NOW YOU CAN FLY YOUR OWN Not Included) turn will bleed off the extra speed. ELECTRIC POWERED B LIM P! COMPLETE CATALOG $1.00 Don’t be afraid of breaking the wing as you pull out of a dive. The elevator O. BOX 2498 -MB LA MESA. CALIF. 92041 cannot apply nearly the load that a tail Peck-Polymers PHONE (714) 469-8675 or (714)442-4636 can to the wing of a tailled model. Be warned that this means that you need said launch, don't just let go of the the up elevator and watch the model more room to pull out of a dive if you model. Thrust the plane firmly into the shoot forward. After the glide has stabi­ overcontrol. I have never been able to air at flight speed and up at least 45 lized, apply partial up to obtain a stall. do a spin with this configuration so you degrees. The model should then assume The elevator can be stalled if full up is need to dive to get it down. Spot landings an attitude of about 80 degrees and go to given too quickly. All the elevator are a matter of practice. the top. Leave the line just as with a controls should be given with gentle­ POSTSCRIPT tailled plane. Check and adjust your ness. You will receive better response. I would liketotakethisopportunityto glide if necessary. The two hook can be During the stall, little altitude should be thank the members of the Soaring adjusted aft to get a steeper climb, but I lost. No tip stall should be noticed. Now Union of Los Angeles (SULA) for their don’t recommend it being behind the try a loop. Give a small amount of down support in my flying wing projects. center of gravity. (down is very powerful) to pick up Especially the building and flying of Try these maneuvers as you fly. First, speed. Ease back on the elevator to various designs. This large, harmonious very slowly feed in full up elevator. You about half-throw and hold. You should group under the direction of President should notice that the forward speed get a large, round loop. Try another.and Ron Brown is a pleasure to associate drops off and the nose comes up without this time, apply full up as you start up. with. Members assisting in this project a stall. Now apply full rudder; the model Properly done, you will get what I call a include Phil Burton and Ed Schnaken- should turn very tightly and speed up. comma. As the plane reaches the top burg, who built copies to check out the Release the turn and apply enough and is upside down, the speed drops to flight characteristics for consistency. rudder to straighten out. Now release zero and the weight in the nose takes Other flying wing designs are avail­ able from Western Plan Service, 5621 Michelle Drive, Torrance, CA 90503. Send a first class stamp for a flyer, or $1 for a catalog. These models are for thermal and slope flight under moder­ ate conditions. Good Lift! AUTHOR David L. (Dave) Jones is 49 years old and has been modeling for 40 years. His direction has been sailplane, since 1948. He switched to radio control when it started to become reliable. First, with single-channel tone and then with an early PCS. He is reponsible. with Chuck Clemans, for ‘Little Plank’ RCM, May 1972 and ‘Standard Plank’ RCM, July 1975. He designed ‘AR-25’ MA, August 1978. He is also responsible fo r the Soaring article in MAN, May 1977 deal­ ing with flying wings. Dave is employed as a configuration designer at North American Aircraft Division of Rockwell International. During his five-year Air Force tour (four in Europe) he wasschooled in Electronics and Combat Intelligence. He is a gradu­ ate of Northrop Aeronautical Institute with an associate in Aeronautical Engi­ neering Technology and a BS in Engi­ neering Technology from Northrop University. ·

Byron P-51 .. Continued from page 17 The “ Stab and Elevator Assembly" is listed next on the instructions, and here is where the low-time builder might possibly get himself in trouble. To insure that the wing, stab, rudder, fuselage, and

102 MODEL BUILDER panel lines are all aligned, I recommend the following procedure: 1. Epoxy the foam collar to the rear of JOHN POND the main fuselage section. The collar should be pulled toward the rear until the glass is very tight around it and no air Old Time Plan Service space is visible. Wipe away any epoxy that oozes out onto the bare foam. To The largest selection of plans in the world at the most hold the collar in place while the epoxy reasonable prices. Each list $1.00 sets, dril I several sm alll/16 holes through All 4 for $3.00 the glass and foam and insert short No. 12 OLD TIMER F/F GAS lengths of 1/16 wire to act as pins. They No. 12 OLD TIMER RUBBER/TOW LINE can be twisted and pulled out after the No. 12 OLD TIMER FLYING SCALE A through K glue has set up. 2. Without epoxy, slide the rear por­ No. 12 OLD TIMER FLYING SCALE L through Z tion of the fuselage onto the foam collar New plans prices effective Oct. 1, 1981 while aligning the panel lines and P.O. Box 3215 making sure that the fuselage is straight San Jose, Calif. 95156 when viewed from the top. rear, and sides. Be sure it is pushed fully forward Phone (408) 292 3382 and is tight on the foam. Repeat the 1/16 the canopy material and had caused it to Street, Plantation, Florida 33313. drill-and-pin sequence to hold it tempo­ buckle and curl badly, especially on the Not much needs to be said about the rarily in place. bottom edge. Whether the paint really rest of the construction steps listed in 3. The foam rudder post should be attacked it, or paint shrinkage cause the the manual, as they are pretty much spot epoxied to the rudder and inserted distortion. I’m not sure,since thecanopy straight-forward. The fuel tank included into the rear of the vertical stabilizer material is quite thin. I was, with much with the kit appears to be a Kraft Slim­ until the hinge slots in the rudder are effort (both physical and verbal!), able line, a type I had never used before, but just covered by the glass. Tape this in to get the canopy epoxied on, but there I'm not sure, as no instructions for it place whilealso using clampstosqueeze is still some distortion left. Gluing the were provided. The pushrods supplied the glass down tight onto the rudder canopy on first then painting the black for the elevator and tailwheel were also post, since it is a very loose fit (mark in on the outside with theprim er and color strange to me, being made of aluminum pencil on the glass the post location so coats over the black would prevent this. tubing with nylon end caps, into which that it can be epoxied in the same You should by now have purchased, threaded rods were inserted. A drawing position later on). This will insure that painted, and installed your pilot. My depicts how the parts go together, but the foam post is in the right position and choice was the excellent one supplied again, there were no written instructions that the fin width is correct since this by Dave Platt Models Inc. This 1/5-scale telling how to secure the end caps into affects the stabilizer placement. fighter pilot is very realistic in appear­ the tubing. I elected to use fiberglass 4. The wing should nowbepositioned ance and comes with an excellent man­ arrow-shafts instead. on the fuselage, taking measurements ual describing the proper painting Regarding radio installation, only a from wingtip to tail to insure that the methods for an authentic look. Made of general location of components is shown wing is true fore and aft. Small pieces of a micro-balloon/resin base body filler, in the drawings, but this proves to be no the wing seating foam should be installed the full bodied figure will add about 11 problem, as everyone usually has their temporarily to give the desired spacing. ounces to the weight of a model (only own method of doing this. I constructed The wing and saddle contour on my the bust can be used in the Mustang!). a box between the fuel tank and the model were a perfect fit. With every­ The $25 price tag may seem high, until rudder/elevator throttle servos in which thing aligned, the bolt holes for the wing you try to carve one yourself that looks to house the receiver and one amp mounting can now be drilled through as good. Platt’s address is 6940 N.W. 15th battery pack. On top of this box is the wing pockets into the fuselage. The blind nuts can be installed later. 5. The stabilizer may now be installed. Refer to the manual. Glue the foam and spars to the outside of the fuselage, making sure the stab is aligned with the wing. When set up, remove the rudder and post and remove the rear fuselage The most section from the front. The other internal work on the fuselage may now be com­ distinctive sound pleted. When the rear section is finally in the a ir... epoxied onto the collar, line up the Technopower’s matching 1/16 holes, re-insert the 1/16 pins and let cure. If the fin is not true in 7 cylinder, 4 cycle relation to the stab and wing, it can be Radial Engine bent or twisted slightly when the rudder post is epoxied in and held until the glue has set. Send $2.00 for catalog Since the glass is quite thin, I epoxied of all our products in an extra layer of heavy glass cloth around the area of the tailwheel former for extra strength. The cockpit and canopy are listed TECHNOPOWER Π, INC. 16650 South 104 th AVENUE. next in the manual, and here is where I ORLAND PARK. ILUNOIS 60462 ran into a problem, lo keep the white primer from showing through on the inside of the canopy frame, I painted the inside frame with K&B black and set it aside to dry. The next day I discovered, to my horror, that the paint had attacked

JANUARY 1982 103 mately 18 pounds of thrust. This was with NEW! a brand new tight engine probably a ^TRANSMITTER TRANSMITTER , / little on the rich side. A factory repre­ MUFF sentative stated that this was a bit on the low side and should improve with more CASE running time. Idle speed was an unbe­ lievably low 300RPM! Donotbealarmed PROTECT YOUR by the flexing of the prop blades at low INVESTMENT!! WINTER FLYING? RPM. This is normal and they true out very well at flight speeds. Although the engine is smooth at Beautiful vinyl exterior. Plush pile interior Help keep your hands warm with a space normal speeds, there is considerable with convenient zipper opening and carry- age technology insulated muff. Velcro 'mg strap. Comes in Black - Brown - Red. strip for ease of removal and insertion of vibration at lower RPM so do make sure Your name personalized in gold foil on transmitter. Ribbed cotton cuffs. Folds that anything that could shake loose is request. and stores to pocket size. well secured. Apply Loctite to all nuts $19.95 + $1.50 ea (U.S.) ship/handling. $11.95 + $1.50 ea. (U.S.) ship/handling. and bolts. I would suggest running Please specify color, transmitter name several tanks of fuel through the engine and model number. W ashington res. add 5.3% Sales Tax. on the ground with the plane completely RAM TEC, P.O. Box 3203, Lynnwood, WA 98036 (206) 778-7533 assembled. There is always something that you will have forgotten to tighten or mounted the retract servo and valve retract system has performed flawlessly. glue securely. This will give it a chance to mechanism. My model was finished entirely with show up before the first flight. The radio used in this aircraft must K&B paints. I do wish it was sold in larger (Byron Originals agrees with (his pro­ have six channels and be resistant to quantities, to give a guy a break on cost cedure. but cautions that the cowl electrical noises from the engine. If in and to preclude having to mix a bunch should be removed for this run-in doubt about yours, check with the of small cans of paint together in one period, wen) manufacturer. My choice was my trusty large can for color match. Expect to Well, the model was finished and I was old Futaba FP-6FN six-channel system spend around $100 for paint if you wish becoming increasingly apprehensive. with S-17 servos, which are equivalent to to have an elaborate job. Here was the most complicated and the current S-23s. Between my father As mentioned earlier, two sheets of sophisticated model I had ever built, and myself, we have five Futaba radios, beautiful pressure sensitive decals are with a higher wing loading (40 oz. sq. ft.) and this is the third gasoline engine provided with the kit for four specific than anything I had ever flown. Also, like model we have used them in without so aircraft: "Candy Man” , the "Flying probably many of your readers, I had much as a glitch. Forthe regular controls, Undertaker” , "Snooks 5th", and Bob both heard and read some unfavorable the standard servos provide plenty of Hoover’s "Rockwell International". Un­ comments about the airplane, especially power. For the flaps, I used the S-24 fortunately, no decal or painting instruc­ regarding the retracts and flight charac­ servo, which has 62 oz. in. of torque. The tions are provided, leaving the builder teristics, and that certainly didn’t help retract servo recommended by the in­ to find his own documentation. I was matters. structions should have 180 degrees of fortunate in having a beautifully restored Since the dirt field I fly off of is quite travel with a minimum 3-second transit Mustang based nearby, with an owner rough, I had taken a couple of precau­ time. High torque is not required. I willing to let me get all the photos and tions with the gear. Instead of the 8/32 x chose the S-8 heavy duty retract which is documentation I needed to reproduce 1/2 nylon bolts which hold in the gear non-proportional. Although the transit his paint scheme. The only decals I used units, I used steel bolts. Also, I had time is less than 3 seconds, I still had were the star and bar insignias. The black tightened the upper strut attachment enough leeway to pinch down the air numbers and large letters were made arm pinch bolt as tight as possible. Still, I lines with 1/8 wheel collars and slow from black Monokote, with the rest of didn’t hardly sleep a wink the night down the gear action to a more realistic the lettering and detailing being painted before the first flight, and the next speed. Gear actuation requires a good on. A final overall coat of clear sealed m orning my heart was really in my air pump that will supply a minimum of the whole works. throat! 100 pounds pressure. I tried one of the I was delighted to find that in spite of Well, as you may have guessed, it was small ones made expressly for models the rather heavy finish my model all for naught! The model took off and and it just couldn’t cut it. I ended up weighed in at a hair under 23 pounds flew beautifully! I don’t remember ever buying a good quality bicycle tire pump (less fuel) with the center of gravity right having built a model which required so which works very well. Initially, the clam on the money. This shows either good little trim change on the first flight; one doors did not open and close evenly, but luck on my part or darn good engineer­ notch of up elevator and one of left this was solved by drilling several 1/16 ing at the factory. I tend to believe the aileron. How sweet it was! This is not to holes in one of the bellcrank arms to latter! say the first couple o f fligh ts were provide a range of adjustment for the Engine tests revealed a top propellor without incident, as early flights on a connecting rod. Other than that, the RPM of 2500, static, producing approxi­ new ship usually are. The engine quit after about five minutes (due to a pinched fuel line) on the first flight, and I C7Ae S aifp/ane f a c t o r y was forced to land downhill with a quartering tailwind from the left. I ran YOUR R/C SOARING HEADQUARTERS' out of right rudder while still rolling • Imported and domestic Sailplane kits (over 75 designs to choose pretty good and ended up in a high from). speed groundloop to the left. If the gear • Ultra-Trick soaring hardware including linkages tor (laps, ailerons was ever going to fold this was the and spoilers, mixers, releasable hooks, skids, canopies and canopy opportunity, but it didn’t even flinch. latches, wing joiner (blade) systems. On the next flight, the engine began • Sailplane retracts, 5 types to choose from including air and electric to miss badly and run very rough imme­ • Shempp-Hirth scissor-type spoilers, also a new type of trailing edge diately after lift off. This is where I airbrake/spoiler “Bremsklappen." discovered just how slow this airplane • Complete line of launching equipment and supplies—Winchmaster. could fly, as it staggered around in a half­ Fabtec and T.S.F. products. circuit to land into the wind. This time it The only thing we don't stock is LIFT! was a faulty kill-switch I had installed. P.O. Box 341, Red Lion, PA 17356 With that disconnected the third flight (717) 246-2263 9:00 a m. to 9:00 p.m. EST was perfect! There is one word that best 104 MODEL BUILDER describes the flight performance of this model, MAGNIFICENT! It is absolutely CONTROLLED the most realistic model Mustang I have INSURANCE FROM ever seen in flight. It tracks very well on the ground and lifts off after a roll of YOU'RE IN GOOD HANDS W ITH A... « R a m ODELS INC. approximately 75 feet in dead air. Accel­ eration and climb are breathtaking. 4736 N MILWAUKEE AVE CHICAGO. IL 60630 USA Stalls are quite gentle, and slow flight (in BATTERY BACKER #RED 09. Senses low or intermittent voltage trom the primary RX battery and switches to a 100 milliamp or larger backup battery, then sounds an audio alarm. Eliminates the most common cause spite of the wing loading) is something of radio failure. Backup battery and switch harness are required. I ’/i ’ x '/i ' x V<" plus beeper vr x V x Vť. you have to see to believe. Ailerons are Total weight 1 oz. $39.95. effective right down to the stall with very DUAL SERVO SETTER ftREO 10. Senses loss of radio signal or low battery and moves TWO servos to a pre­ little adverse yaw or reversal. I would selected position. Connectors required. Vk" x1'7»" x Weight 1 oz $39.95 rate its handling characteristics quite AUDIO BATTERY ALARM if RED 11. Can be easily installed in either the RX (4.8 volt) or TX (9.6 volt) system similar to those of the “ Ugly Stick” . Senses low battery voltage and sounds an audio alarm. %" x %” x V>" plus beeper V x V x Total weight 5 oz. $19.95 Loops and rolls are effortless, and the GO BOX #RED 12. Superbright red and green LED s tell you whether your RX (4.8 volt) and TX (9.6 volt) other fellows watching the flightsquess- batteries are ready to "GO'' Connectors required. 3" x 2'/* *" x Vt. 524.95 timated a level flight speed of 75-80 AUDIO FLIGHT TIMER ffRED 13. Dependable, solid state, can be set from 37 seconds to 20 minutes. Flick a MPH, which is right in the ballpark in switch to start and stop 9 volt battery required. 3" x 2'/«" x V . $24 95 terms of scale appearance. Flaps, sur­ IF UNAVAILABLE LOCALLY. ADO SI.00 FOR DIRECT ORDER. NO C.0.0. SENO S.A.S.E. FOR INFO. prisingly, require no pitch trim change when lowered, and cut the landing from aileron flutter. Guys, take atripout be, the first 8-engined, 4-point rolls in speed to a crawl. I guarantee that any to the local pea patch and check out history... My apologies, Mr. Hughes, I little problem a builder may encounter how the ‘big boys' do it. like to think that you ‘might’ have liked during construction will simply fade Highlight of the trip for yours truly, it. We did. A prolonged touch of down from memory when the model takes was our attempts to fly the big Hughes elevator while inverted induced air into wing. from Lake Mead on Saturday morning. the fuel lines, causing a loss of engines 5, In summing up, I would have to say Rough water and strong winds said, 6, 7, and 8 on the next sweep of the that the model itself is of the highest "D o n ’t even try.” But try we did, and on beach, but, years ago, the boys in the quality and well worth the combined the first attempt to get airborne, rough head shed at Hughes did their home­ purchase price of almost $760. The water tore the left float from the wing. work, and with a large application of left instructions are the only place where I We were ready to hang it up after giving rudder, left aileron, and full power on 1, can find a fault of any consequence. it our best shot, but Darrell said, "O ne 2,3, and 4, we completed a 360 to the left What do I think of Byron Originals more try,” much to the delight of close and landed the big bird. ’Nuff said. products? Well, I just ordered two of the to 800 spectators. Leave it to a bunch of Wait'll next year. · F-16s. modelers to jump in to help, Bob Geek, In closing, I wish to sincerely thank of the Anaheim R/C Club, Bob and Bill Counter...... Continued from page 9 Thurman Bruce and Alan Davis for their Hunter of Satellite City, with ‘‘Hot help with this project. · Stuff,” "Super T", glass cloth and baking included in the kits. Check your local soda and with some help from hair hobby shops, if not available, send a dryers to dry out the wood and foam, SASE for information and prices to: R/C World . . . .Continued from page 13 and in about 30 minutes, we were ready Campbells Custom Kits, P.O. Box 5996, the winds behaved; Saturday, the (cross) 'one more time.' Merle waded out with Lake Worth, FL 33461-0181. winds arrived. Several models were the Hughes, and was covered with spray ★ ★ ★ observed on their ‘test flights' when they as he held on to the fin while Darrell ran R.M.S. Tooling has just released its all were ‘supposed’ to have been test flown the engines up to full power. The new 16:1 ratio winder for indoor rubber B.V.D. (before Vegas, Dammit). Ed Hughes plowed through the top of a powered models. Utilizing a special low Morgan, the Bunkers, Rex Perkins, and wave, C&D Glo-Drivers and K&B 61s shrink injection-molded plastic, the the few others who put this magnificent doing their thing, and about then, I close-fitting main gear train coupled happening together are already making think that Hughes must have reached with the16:1 ratioallowswindingtomax plans for ‘next year.' A change of dateto down and tugged gently at both wing turns three times as fast as current low minimize the chances of wind blowing tips . .. 'cause she became airborne. ratio winders. A handy conversion table things out, excellent possibilities of Flight number 7 was now becoming molded on the back face allows the user QSAA chapters three and seven supply­ history. Many flybys to everyone’s to quickly and accurately determine the ing some ‘person’ power to assist in the satisfaction and then to top off our number of winds. Suggested retail is field operations, are just a few of the Barrel Roll with the Goose several $11.95. R.M.S. Tooling, 11370 Eldorado contemplated changes. months ago, we executed, we believe to Ave., San Fernando, CA 91340; (213) It was very interesting to note the number of manufacturers who valued the exposure of this large 'specialty' Wilshire Model Center gathering to have manned booths at the 30U6 Wilshire Blvd Santa Monica. CA 90403 828*9362 static display on Thursday and at the SOAR WITH THESE EXCELLENT SAILPLANES flying site... Regarding these ‘Miniature Aircraft’ AND POWER MODELS FROM WEST GERMANY from a safety and longevity point of OR FLY SILENTLY WITH GEIST & CARRERA view, too many modelers are still per­ ELECTRIC POWER forming control surface hinging as if they were still building .40 and .60 CARRERA GEIST EISMANN powered models. This, coupled with a ROEBERS GRAUPNER WANITSCHEK lack of attention to the aerodynamics of Send $1.00 for folder on Geist Electric Flight Systems (in English) control surfaces, i.e.: air gaps, insuffi­ cient number of hinges, hinges that Send $10.00 for Carrera's 216 page catalog, in color, their whole line either were too sloppy, or too tight, not of Sailplanes. Gas. Electric Models and Accessories (in German) shrouded properly, pushrods that could Price of folder or catalog refunded with purchase: flex, static and dynamic balancing ig­ Visa & Master Charge Accepted nored; all, or some of the above added BUSINESS HOURS: 10-6 MON -FRI 10-5 SAT CLOSED SUNDAY up to several birds going in, especially

JANUARY 1982 105 ★ ★ ★ Prather Products has released its new “ Prather 46 Deep Vee” boat kit designed for .60 to .90 size engines. Featuring a F L Y EL TRIC joined epoxy fiberglass hull for strength and warp resistance, ease of construc­ tion is assured. This contest proven VL-101 Electric propulsion system design (the prototype having won shown—using Hytork 48 motor and X-class, deep vee at the 1981 NAMBA planetary gear box, SJ-3 switch & Nats) should prove to be extremely charging jack, and B-33L fast charge popular. Suggested retail is $169.95,with ni-cad flight battery—total weight optional hatch cover, running hard­ 2VÍ oz.—will power models 25 to ware, and radio box kits available. See 50" wingspan weighing up to 10 oz. Γ your dealer, or send 50

J Indoor...... Continued from page 63 YES-SIR.YES-SIR, THREE SAOS FULL competent Dan Domina, who had an outstanding ninth round flight of 40:40. ή . ™ A v a i l a b l e f f o v J Fifth and sixth places were won by Californians, Bud Romak and Clarence Mather, respectively. (Romak was later selected as Team Manager, wen) From these fliers a team will be as­ sembled to participate in the World A !Une>€R o r fL/tAJS-Stne. P a ./ c£ ! Championship to be held during 1982. WALT MOONEY NOW OFFERS 4 b a GS OF PEANUT SCALE PLANS The site for the Championship is at this a l l w e l l TESTED DESIGNS, AT ONLY fS.OO EACH time still undetermined, with the choices being Rumania or England. · EACH BAG FEATURES FOURTEEN PEANUT PLANS, o n e o t h e r , p l u s p h o t o s a n o information SEND ·|.0 0 FOR COMPLETE LISTING ANO SAMPLE PLAN TO: Workbench . .. Continued from page 6 WALT MOONEY, 2 fl2 CABRlLLO MESA OR smooth it out. Of course, this sorta defeated the lightweight feature of the SAN DIEGO, CALIFORNIA B 2 I2 3 material. Anyway, the coming of Monokote 361 -0456. Co., 339 Myrtle Ave., Cotati, CA 94928; sorta put an end to the majority popu­ ★ ★ ★ (707) 664-1733. larity of the parachute nylon. Only Kimbrough Products has introduced ★ ★ ★ recently, we had a request from some­ its “ Trans-Grip” for R/C car and boat Wings o f Man, recently published by one wanting to know the source of this drivers. Get a 'handle' on your transmit­ The Aviation Book Company and au­ material and it kinda got us curious. Can ter without buying a new one. Easy, 30 thored by Jack King, is a deeply en­ anyone fill us in on the name of that second installation with servo tape, grossing story of the experiences, ac­ company, or one similar? Let us hear which is included. No linkages to hook­ complishments, and escapades of Cap­ from you. up, either. Costs $3.95 at hobby shops, or tain H.T. “ Dick” M errill, a retired LICENSE PLATE MANIA contact: Kimbrough Products, 1430E.St. Eastern Airlines Captain with 50 years You’ve seen the license plate frames Andrews PI., U nit E, Santa Ana, CA and over 45,000 hours of flying time in with messages on them: “ I’d Rather Be 92705; (714) 557-4530. everything from OX-5 Jennies to today’s Flying” , “ My Other Car Is A Porsche” , ★ ★ ★ Jumbos. Dick M errill’s exploits of flying “ Save The Whales” , “ Have You Hugged The Departure Co. hasannounced the the mail at night would make a movie Your Kid Today” , etc. The other day, we introduction of its reliable Airborne plot equal to Baa-Baa Black Sheep pulled up behind a Fiat 120 Spyder. Solar Battery Charger Kits. These simple, anytime, especially considering the lack Above the license plate, it said “ FIAT” . easy-to-install solar chargers are rugged, of blind flying equipment, and the very On the bottom frame, it said “ Fix It crash resistant, and produce enough small number of times that Merrill Again Tony” . power for 3 to 4-servo and receiver couldn't get through. Merrill flew the ACHTUNG SAM! setups, even when installed underneath first round trip of the Atlantic, was Just received an interesting letter from colored transparent Monokote. The personal pilot of Presidential Nominee Gerhard Everwyn, Dachsteinstrasse 12A, standard 5-volt 250 milliamp charger Eisenhower, flew a 6,000 mile rescue D-8000 Munchen 82, West Germany. allows operation in partly cloudly, hazy, flight to the South Pole, and an around- Dear Mr. Northrop, or smoggy conditions from sunrise to the-world flight with radio and TV In view of your detailed coverage of sunset, due to special anti-reflective, personality Arthur Godfrey for openers. the SAM oldtim er scene the following high output cells (just like NASA uses). Still quite active at age 87, Dick M errill is news item might interest you. . . The kits include solar cells, hookup currently Curator of the Shannon Air From America, the movement spread wire, voltage regulation and blocking Museum in Fredericksburg, Virginia. to England, as you will know, and there diodes, quick release plug and jack, and Recommended reading... David Baker urged me to do a piece on complete instructions (see construction This 416 page hardbound volume, SAM-E for the German magazines. I did articles starting in September, 1981 issues with over 260 photos, is available at book so, and found myself heading up a of Model Builder). Airborne and trans­ stores, or by direct mail from the Avia­ whole group in the matter of a few mitter kits should be at your dealers tion Book Co., 1640 Victory Blvd., Glen­ months only. Flug+Modell-Technik has now, or send a SASE for prices and dale, CA 91201; price $18.95, plus 6% just come out with a thirty-year review information to: Ed Karnes, Departure California sales tax. special issue with a four-page feature on

106 MODEL BUILDER Ace R/C, Inc...... 71 INDEX TO ADVERTISERS RCH Hobby Marketing ...... 99 Airtronics ...... 1 RAM Radio Controlled Models, Inc. 105 American R/C Helicopters ...... 4 RAMTEC ...... 104 Applied Design Corp...... 76 Hobby Poxy Products...... 83 Ron’s Hobby Studio ...... 85 Associated Electrics...... 73 Indoor Model Supply ...... 89 Roush Manufacturing ...... 84 Astro Flight...... 96 International Modeler Show ...... 72 Sailplane Factory, The ...... 104 Authorized Radio Control Service... 93 J-5 Enterprises...... 81 Satellite C ity ...... Barron's Scale Classics...... 89 K & B Manufacturing Co...... 1 Sig Mfg. Co.. Inc...... 5 Bavarian Precision Products...... 68 Kraft Systems. Inc...... 56.57 Glen Sig Memorial...... 82 Byron O rig in a ls...... 69 K & S Engineering...... 93 Smith Plans...... 99 Bud Caddell Plans...... 85 Kustom Kraftsmanship...... 86 Sterling Models ...... 102 Cannon Electronics...... 74 Laughing Whale. T h e ...... 78 Sullivan Products...... Circus Hobbies...... Leisure Electronics...... 98 Su-Pr-Line ...... 70 C overite...... 88 Mark's Models...... 79 T & D Fiberglass...... 100 Jim Crocket R eplicas...... 70 McDaniel's R/C Service...... 90 Technopower II ...... 103 Curacao Modelbouw...... 97 Midway Model Company...... 80 Uber Skiver K nives___ ...... 111 Delta Mfg., Inc...... 97 Midwest Model S upply...... 101 VL Products...... 106 Draper's R/C Service...... 68 Model Rectifier Corporation .. Cover 4 Ward Marine Corp...... 101 Dumas Products...... 75 Walt Mooney Peanuts...... 106 W.E. Technical Services ...... 97 Du-Bro Products...... 91 Sid Morgan Plans...... 89 Williams Bros...... 110 Dynamic Model Products ...... 96 Northrop Real Estate...... 90 Wings Engineering___ ...... 86 Electroline Models...... 85 Octura Models ...... 94 Wilshire Model Center ...... 105 Electronic Model Systems ...... 70 Orange Coast Hobbies...... 77 FAI Model S u p p ly ...... 96 Peck-Polymers ...... 102 HOUSE ADS Fox Manufacturing Co...... 87 Personality P lu s...... 86 Binders ...... Futaba Industries...... 3 John Pond O.T. Plans...... 103 Classifieds ...... 107 Dick Hanson Models...... 80 Proctor Enterprises...... 99 Full Size Plans...... 108.109 Herb's Model Motors...... 88 R/C Buyers G uide...... 92 Oldies But Goodies___ ...... 112 Hobby Horn...... 100 R/C Modelle Magazine...... 76 Subscription Form...... 81 CLASSIFIED ADS ROPER 1.9 cubic inch 2 HP engines at super Non-commercial (personal items) rate is 25 cents per word, with a minimum of $3.00. sale prices New factory assembled $45 00 Commercial rate is 40 cents per word, with a minimum of $5.00. No advertising agency Ready to assemble kits $39 00 Prop adap- discounts allowed. tors $13.95 Prices include shipping and All ads are payable with order, and may be for any consecutive insertion period specified. handling. Wtll ship COD Dealers inquiries Name and address free, phone number counts as two words. Send ad and payment to: invited. Everett H Yost. Dept. MB. R.R #1 Box MODEL BUILDER. Classified Ads. Box 335. 621 West 19th St., Costa Mesa, CA 92627. #37. Sauk City, Wl 53583

HIGH PERFORMANCE RUBBER POWER WANTED — OLD MODEL ignition engines PLANS — New list — Grapenut, Sainte cars etc Paying top dollar Bill Simpson 7413 OLD KITS FOR SALE: Large listing includes Formula, more Send SASE: David Aronstein. Via Lorado Rancho Palos Verdes CA 90274 Berkeley, Dumas. Cleveland. Megow. Eagle. 50 Pasture Lane, Poughkeepsie NY 12603. (213) 377-3532 Comet. Scientific, and others Send $1 forlist Ed Hilton, 1801 Father Ryan Ave, Biloxi. MS Build a 1 /3-scale WW-I fighter for your ENGINES — New and used Original Atom 39530. children to play in Fokker Triplane or SE5 castings. Vi veil parts, balsa kits List 300 Biplane plans $9 Russell Patterson. 2955 S T. Crouss, 100 Smyrna St , West Springfield. 3145 W. Granger. UT 84119. MA 01089 EMBLEMS — Direct from manufacturer Swiss embroidered Custom made to your PEANUT SCALE. New plan available. Brew- WANTED Old model airplane engines, gas design. Send sample or sketch and quantity ster Buffalo $1 50 plus 40C postage SAE for model race cars related items 1935 55 needed for free quotation David Haemmerle list or $1 for sample plan and list. David Diels. Arthur Suhr W218 N5866 Maclynn Court & Sons, Inc., Box 711. West New York. NJ Box 101. Woodville, OH 43469 Menomonee Falls Wl 53051 07093-0711.

SAM USA, England, and our activities in November issue . .. not as funny as the This idea is not new to some of the Germany. I estimate the number of “ Multi-Purpose Work Center” on page Torrey Pines glider guiders, but 24 b u ild e rs at abo ut 30 w ith some 40 9, but a mix-up nevertheless. Bill Han­ ounces on 54 inch span...! models under construction. I am trying nan’s column continues on page 71 as WHO WAS FIRST? to bring them together by means of a indicated, but before getting there, it Although our Oba St. Claire article little newsletter and FMT has given us stopped off and visited the third column series was not meant to claim that Oba space. I see little point in forming an of Dirty Dan’s article on page 51. It’s was the first ever to fly U-control, there independent group in Germany, and about the only way you can interrupt is no doubt it will bring about comments envisage European activities centered Dirty once he gets going! in that direction. on London and all within the framework CORRECTION OF A CORRECTION Ron M oulton, well-known modeling commenced by SAM in the USA. We commented in the December personality with Model & Allied Publi­ Advised by David Baker, I took a W o rkbe nch that a WW-II fighter cations Ltd., of England, sent a repro­ subscription on Model Builder and have wouldn’t do too well as a slope soarer duction of page 14 from his Control Line just... as you may know . . . ordered all (regarding transposed captions on page M anual, which describes and shows of your back copies available so that we 8), but then, to counter that we read (on photos of a C/L model flown in 1929 with have at least one complete sef of SAM page 8!) of a recent Model Aviation power transmitted from the center to the related info here in Germany. Sincerely, Canada newsletter that Wendell Hughes, aircraft by speedometer cable. Actually, Gerhard Everwyn. who lives on Prince Edward Island is the same modeler, F.B. Thomas, first It’s obvious that Mr. Everwyn is very indeed slope soaring a P-51 Mustang! flew control line in Great Britain during much at home with the English langu­ Wendell blew up an 18-inch Comet P-51 1925! age, so if any SAMers out there care to (not with dynamite stupo, he used Anyone care to top that? contact him, go to it. pencil, paper, and proportional divid­ THINGS TO DO CORRECTION ers!) to 54 inches and managed an all-up The annual trade show season for 1982 A slip of the paste-up job produced a weight of 24 ounces. The ship flies up a is not all that far away, and here’s a mix-up of copy on pages 50 and 51 of the storm and even goes up well on tow. reminder about the ones we know JANUARY 1982 107 No. 7812 BIG PROP CHARTS $1.50 No. 12802 AUSTER J-5 $2.00 FULL SIZE PLANS SERVICE Cherts for determining best engine and Fine flying, 18" span rubber scale light- Including reprint of construction artieJe prop sizes for the "biggies". John Burns. plane. Double for Jumbo. Steve Gardner. (if any) No. 7813 GREAT EXPECTATIONS $1.50 No. 1280-0.T. STRUCK'S KGS $4.00 West Coest/Mooney Bostonian design for So-called because proportions ere KG-ish, No. 1821 Model Builder RAVEN $5.75 beginner or expert. By Ernie Wrisley. but the looks are Zipper-like. Class B/C. Latest in a long line of tailless R/C sail­ No. 781-0.T. BERRYLOID WINNER $5.00 planes, span 110", 2-ch. By Dave Jones. Winner of the coveted best finish trophy No. 1280-C.P. WEDELL-WILLIAMS $3.00 at the 1938 Nationals. Harold Coovert. Plans from golden era Wanner rubber kit. No. 182-C.P. SUPER G SHARK S3.00 All ribs and bulkheads shown, 30" span. No. 6811 CURTISS P-40 $10.00 An historic two-line controlled model of No. 11801 "MAMA M IA!" $9.50 classic lines; one of many by Vic Stanzel. Exact-outline giant/sport R/C scale for .90 power, 80" span. By Art Johnson. Latest, super-size pattern ship by leading flier/designer/kit manufacturer, Joe Bridi. No. 182-0.T. HI-HO $3.50 No. 6812 LETTERS 8< NUMBERS $1.50 A 1940 convertible stick/Wakef ield; uses No. 1180-O.T. FOKKER D-VIII $4.50 demountable cabin/pod. By Ed Lidgard. Letters/numbers in round/square block, plus proportional guide to make any siza Very stable F/F flying scale ship for .23 No. 12811 XINGU $4.00 ignition engines, 57" span. By Earl Stahl. High performance F38 type sailplane of No. 681-O.T. ROCKETEER $4.50 contemporary construction. Ken Stuhr. High-climbing Class C gassie from Nov. No. 1180-C.P. FAIREY "BATTLE" $100 ‘38 Air Trails. By Maurice Schoenbrun. Fine proportioned 30" span rubber pow­ Να 12812 A.J. INTERCEPTOR $0.50 ered low-wing scale ship from Megow kit. Replica of the famous Jim Walker folding No. 5811 BLANÍK L-13 8t L-13J $9.50 wing catapult glider. By Dave Thornburg. Czech 2-place sailplane in 1/5 R/C scela No. 10801 UDET FLAMINGO $6.75 Optional power. Span 126". L. Houha. Easily built R/C sport scale aerobatic bi­ No. 12813 SUNDAY FLYER $2.50 plane for .30-.40 power. Roland Baltes. Easy beginner's 1/2A sport F/F. One-day No. 5812 C02 BANSHEE $1.50 assembly. Ace foam wings. Ken Willard. A 40% reduction of Leon Shulman's Cl. No. 10802 OHMSICK ANGEL $150 A post-war gassie, for CO2. By Ed Toner. No. 1281-O.T. FOLLY II $4.00 F/F Payload-like design for R/C and 020 Beautiful aerodynamic lines on this 6-ft. No. 581-O.T. MY SPARKY $200 electric power, 43" span. Randy Wrisley. gas job. Pic in July '37 MAN. Rod Doy la Original design of longest running kit by Comet. Many building hints. Ed Lidgard. No. ιοβαο.τ. THE $ 4 $150 Super-small gassie from 1939 M.A.N., for No. 11811 WACO TAPERWING $17.95 No. 4811 NORTH STAR $4.00 .049 or Elf (I) power. Malcolm Abzug. Sensational 1/4-scale R/C model of Bob Military scale-like R/C twin for .15 size Lyjack’s Waco. 2.b-3.5 eng. Larry Scott. engines. All wood. By Kalevi Sundquist. No. 1080-C.P. STINSON RELIANT $4.00 A 3/4" scale model from 1934 Ideal kit. No. 1181-0.T. HALF-PINT $2.50 No. 481-C.P. STINSON 105 $3.00 Excellent plans for F/F rubber. R/C. etc. Tiny (24-3/4" span) pylon free flight gas Competition quality 50-inch rubber scale model tor Atom or .020. Louis Garami. kit plans by Megow. All parts detailed. No. 9801 POOLBOY $4.00 Tiny (20" span) R/C biplane flying boat for .010.020 eng., 2-ch. By Ken Willard. No. 10811 HEATH PARASOL $7.50 No. 481-O.T. POU DU CIEL $3.00 Lightweight quarter-scale for .60 power. Finely detailed 22-inch span rubber scale, No. 9800.T. DOLPHIN $10.00 Span 94", two-piece wing. Bob Kitson. Oct, '36 Flying Aces. By Ken Hamilton. Beautiful planked-fuselage 9' streamliner from 1939 M.A.N. By Thracy Petrides. No. 10812 NAVY PT BOAT $100 Να 3811 DORMOY "BATHTUB" $15.00 Built on Dynamic’s 1/2" scale. 39" fiber­ Unusual 1/3-scale R/C (8' span) early ul­ tra-light homebuilt, .40-.60. Hank lltzsch. No. 8801 FUJAVAK $5.00 glass hull. Gas or electric. By Art Bauer. Sharp looking T-tail R/C powered glider No. 3812 HANDLEY PAGE 0/400 $4.00 for .049-.15 eng., 80" span. Pavel Bosak. No. 1081 3 BUTTERFLY ONE $1.00 F/F scale WW-I bomber, 66" span, for 2 This little rubber powered ornithopter 1/2A's. Major contest winner. B. Dennis. No. 8802 SCHNEIDER CUB $6.50 looks like a big butterfly. Ken Johnson. Famous R/C Aircraft No. 5, 3-time Nats winner, 6' span, .60 eng. Alex Schneider., No. 1081-C.P. N. AMERICAN B-25 $4.00 No. 381-0.T. SUPER BUCCANEER $7.50 Miniature Aircraft Corp. 1/2” -scale kit Most famous Antique gassie from 1937. No. 8803 POTTIER P-70-S $100 plans. All printwood parts duplicated. Great for R/C, 90" span. Bill Effinger. F/F scale French homebuilt, 02 electric, trike gear, 29" span, neat! By E. Filion. No. 1081-O.T. OLD SQUARE SIDES $4.50 No. 381-C.P. WACO YQC-6 $100 Very realistic sport cabin from July '40 Super-detailed plan from Skymasters kit. No. 880-0.T. HAYSEED $4.00 Air Trails. Nice for R/C. John Sprague. All ribs and bulkheads accurately shown. Hot A/B pylon (no-window cabin) never beforepublished, 4-ft. span. Carl Hermes. No. 9811 SCALE EDO FLOATS $3.50. No. 2811 LIBERTY SPORT $17.75 Designed for Sig Cub, these floats f it any Mammoth 3-1/4" scale biplane for belt- No. 7801 APPRENTICE $5.00 two-inch scale model. By George Wilson. drive 60 on up. Four sheets. Roger Stern. Continually popular genuine R/C trainer for .19-.35 eng., 72" span. Bill Northrop. No. 9812 STINSON VOYAGER $150 No. 2812 DYKE DELTA $1.50 One-inch scale rubber model of classic Super-light indoor Peanut Scale model. No. 780-0.T. STRATOSPHERE $150 design. Span 34". A.P. 'Speed' Wilson. Will fly 35-45 seconds. By Ken Johnson. Streamline cabin rubber ship from May 1941 M.A.N., 36" span. By Henry Cola No. 981-O.T. BOOMER BUS $4.00 No. 281-O.T. HERON $3.00 Another Henry Struck classic, from Feb. A 48" span Class A gassie from Dec. '39 1941 Air Trails. For .19 to .29 ignition. Flying Aces. Cabin style. Frank Gagne. Complete list of over 400 plans, 50< No. 8811 MINI BIRD $4.00 NEW ORDERING INSTRUCTIONS No. 1811 WACO YKS-6 $6.75 Price includes 3rd or 4th Class mail. For air­ Two-meter version of Dave Thornburg's Classic cabin biplane in R/C Sport Scale. well known Bird of Time. Mark Smith. mail or First Class (Priority) in U.S., add For .29 - .40 engines. By John Bums. 25% of total order. For Overseas Airmail (in­ No. 881-C.P. SEVERSKY P-35 $4.00 cludes Canada and Mexico), add 50% of to­ No. 181-O.T.'32 WAKE WINNER $2.00 tal order. Remit by International Money Or­ Miniature Aircraft Corp. 3/4"-scale kit Super-light 37" span rubber model uses plans. All printwood parts duplicated. der or U.S. funds on Overseas orders. Post­ motor stick. Designed by Gordon Light. age paid for APO and FPO orders. Master Card or VISA accepted. Include card num­ No. 881-0.T. TAIBI'S HORNET $7.50 No. 1812 PAULHAN-TATIN $1.50 Sal Taibi's 1940 design for Forster 99 en­ Interesting 1911 streamliner with curved ber, expiration date, and signature. gine. Span 88", chord 16", 1300 sq. in. dihedral, in Peanut Scale. By J-F Frugoli. CALIFORNIA RESIDENTS ADD «% TAX. MODEL BUILDER PLANS SERVICE No. 7811 SPINE-TAILED SWIFT $3.50 No. 12801 OMAC-1 $7.50 Contemporary 1/2A pylon racer designed R/C Sport Scale pusher-canard executive Box 336. 621 W «t 19th St. to win. Easy glass fuse. Jim Gilgenbach. aircraft, 60 power. By Col· Bob Thacker. COSTA MESA. CALIFORNIA 92627

108 MODEL BUILDER CLASSIC...... OF OUR OLD M O S TTIMER P O P U L A R PLANS ...... SEE PAGE 100 FOR ORDERING INSTRUCTIONS. Designed by Ben Shereshaw, kitted by COMPLETE R /'C M B PLANS LIST SENT WITH EACH ORDER. Scientific. 72" span. By Phil Bernhardt. No. 1180-0.T. FOKKER D-VIII $4.50 No. 977 O.T. ' GUFF" $4.00 No. 475 O.T. G.H.Q. SPORTSTER $5.00 Very stable F/F flying scale ship for .23 Walt Good’s 1938 Class ‘C- gas winner, 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-O.T. FLYING QUAKER $5.00 Beautiful planked-fuselage 9" streamliner Payload gas model winner from Aug '38 First gas model kit by Megow, 1937. from 1939 M.A.N. By Thracy Petrides. M.A.N. Spans 8 feet. By Thracy Petride». 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 O.T. THERM'L THUMBER $4.00 Hot A/B pylon (no-window cabin) never Frank Zaic's 1938 Stout Trophy winner, Hot Class A or B pylon type gas model before published, 4-ft. span. Carl Hermes. also for Wakefield. Patterson & Northrop. Span 48". Redrawn by Phil Bernhardt. No. 780-0.T. STRATOSPHERE $ i5 0 No. 577-O.T. GLADIATOR $5.00 No. 1174-0.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%'. 1941 M.A.N., 36" span. By Henry Cole. Trails, 68" span. M. Schoenbrun design. Still good in Unlim. By Phil Bernhardt. No. 380-0.T. FLAMINGO $6.00 No. 477-O.T. CLOUD CHASER $1.50 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 $5.00 Sort of a 'squared off' Zipper, from 7/40 The famous 1940 "Eastern 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 $3.00 No. 1276-O.T. RAMBLER $4.00 No. 674 O.T. RED ZEPHYR $5.00 Highly refined version of 1937 Moffet Good 72" span contest gas model trom One of the most famous of early kit 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 for .19-.23 ignition. 46". Barney Snyder. rudders, anhedral stab. Tom Engleman Span 64". Redrawn by Phil Bernhardt. 1179-O.T. MISS PHILADELPHIA $8.00 No. 976-OT WINGED VICTORY $5.00 No. 474 O.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-O.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 OT EHLING'37 GAS JOB $5.00 Easily-built Class B gassie with 50" 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 winning1 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 Cam

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 Most famous of all OT gas models, ended M.A.N., 87" span. By Thracy Petrides. the 1937 era Span 78" Phil Bernhardt c

No. 778-0.T. CURTISS ROBIN $6.00 No. 1175 O.T. FOO 2-U-2 $3.00 No. 773 OT LANZOS'GAS MOOEL $6.00 A 1937 Sport Scale ship1 From Comet A pre-Zipper design by Dick Obaiski, re Chet Lanzo’s famous "Record Breäter " 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 8y Phil Bernhardt Reich Redrawn by Phil Berhardt

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

JANUARY 1982 109 Hosea Rd., Lawrenceville, GA 30245- 4695, attn: Bob Rule. U/C ACTIVITY If Jed Kusik, Dale Kirn, and some other NEW REALISM! leaders of the SCCA (Southern Cali­ NEW PILOTS FOR A MORE fornia Controline Association) have anything to say about it, the somewhat NATURAL APPEARANCE dormant hobby of control line flying will FEATURES: pick up in the southern counties of California. The 1981-82 contest calendar ■ 2" SCALE 13 s/e ” HIGH) is now available, and promises plenty of ■ SEPARATE GOGGLES competition activity. Contact Jed Kusik OR SUN GLASSES at 1029 East Grove, Orange, CA 92665, ■ DEEP TORSO for more information. ■ EASILY ASSEMBLED CTO COWL Larry Scott, designer of the magnifi­ ■ EASILY PAINTED cent quarter-scale Waco CTO Taper­ ■ INSTRUCTIONS wing featured in our November '81 STANDARD SHOW SIMPLE SPORTSMAN issue, is ready to ship fiberglass cowls ACTUATING SYSTEM and wheel pants. Prices are $23.95 for the Separate head permits tilting, turning or actuation with your model air­ cowl, and $17.95 for a pair of wheel craft, boat or car control system. Ask for these pilots at your dealer. If pants. Add $2.50 for packaging and UPS he will not supply, order directly from the factory. charges. Larry’s address is Box 86, Kirk- man, IA 51447. · SCALE WHEELS · ENGINE KITS · DISPLAY MODEL KITS MACHINE GUN KITS · ACCESSORIES SEND $1 FOR COMPLETE CATALOG DEPT. MB Scale Views . . Continued from page 29 181 PAWNEE ST., SAN MARCOS, CALIFORNIA · 92069 all-aluminum horizontal and vertical stabilizers and capped by a metal tail about so far. STATEMENT OF OWNERSHIP cone. The fuselage tail-end and the MANAGEMENT AND CIRCULATION First of the year is the IMS show in control surfaces were similar in con­ (Required by 39 U.S.C. 3685) Pasadena, California, January 9 and 10. 1 Date of Filing: October 25. 1981 struction and planforms to that of the 2. Title of Publication MODEL BUILDER MAGAZINE Featuring many live indoor R/C demon­ DC-2’s which were in early production 3 Frequency of issue Monthly strations and static model competition 4 Location of known office of publication (street, city, at the same time. The forward fuselage county, state, zip code) 621 West 19th Street. Costa Mesa. in 40 categories (no entry fee), the show was aluminum cowled with removable Orange County. CA 92627-9990 is adding a Swap Shop, beginning in sections for internal access. The wings, 5 Location of the headquarters or general business 1982, its fifth year. offices of the publishers (not printers): 621 West 19th ailerons, rudders, and elevators were all- Street. Costa Mesa. CA 92627-9990 Next is a new show, opening for the metal with fabric covering, except for 6 Name and addresses of Publisher. Editor and first time in 1982. Taking over from the the wing flaps and elevator trim tabs, Managing Editor. previous RAM show in Seattle, this one Publisher: W.C Northrop. Jr.. 621 West 19th Street. which were metal covered. Costa Mesa CA 92627-9990 is the Northwest Model Exposition, put The landing gear retracted into wheel Editor W.C. Northrop. Jr.. 621 West 19th Street. Costa on by the Mt. Rainier R/C Society, in Mesa CA 92627-9990 wells on each side of the all aluminum Managing Editor. NONE. Puyallup, Washington, on February 6 main float. Water rudders on each side 7 Owner RCMB Inc.. Wm. C Northrop. Jr.. President and 7. It will feature live R/C aircraft, of the float’s stern section were actuated Anita Northrop. Treasurer. 621 West 19th Street. Costa boat, car, and helicopter demos, as well Mesa. CA 92627-9990 by the same extensions on the rudder 8 Known bondholders, mortgagees and other security as U-control. Swap meet, static compe­ pedals that operated the wheel brakes, holders owning or holding 1 percent or more of total tition, and prize drawings also included. after setting the control valve on the amount of bonds, mortgages or other securities NONE Looks like a good one. 11 Extent and Nature of Circulation: right side of the cockpit to "Water The WRAM Show in White Plains, Rudders” . Setting this valve to “ Brakes” Actual New York follows on the 27 and 28 of would allow brake operation. The land­ Average no. copies February. no copies of single ing gear was retracted and extended each issue issue The “ biggie” , Toledo, is a week earlier hydraulically by means of a pilot- during published than usual, on April 2, 3, and 4. operated hand pump, as were the wing preceding nearest to 12 months filing date The MACS hobby and crafts show is flaps. When the flaps were lowered to A Total No Copies Printed 43.672 39.135 just three weeks later, April 24 and 25, in the full 45° position, an interconnect­ (Net Press Run) Long Beach, California. ing rod from the flap actuated an adjus­ B Paid Circulation We have just learned that the South­ table pulley assembly in the aileron 1 Sales thru Dealers and Camera west Modeler Show, in Dallas, has been control system to rotate, which then Street Vendors and shifted in time to March 13 and 14. Kind changed tensions in the cables, causing Counter Sales 26.500 24.000 2. Mail Subscriptions 13.989 13,104 of a tight squeeze between WRAM and the aileron neutral position to droop 14° Toledo for traveling exhibitors! and act as a partial flap. The aileron was c Totai Paid Circulation 40.489 37.104 ★ ★ ★ then still operable, but to lesser degrees D Free Distribution by Mail. Carner R.O.A.R. (Radio Operated Auto of motion. or other means. Samples. Racers) has announced the first ever Armament consisted of one fixed 30- Complimentary and Other World Championships for 1/12-scale caliber Mod. M-2 Browning machine Free Copies 1.250 229 electric cars, tentatively set for the Los gun firing forward, and another on a E Total Distribution Angeles area in August of 1982. flexible mount in the rear cockpit. A (Sumof Cand D) 41.739 37.333 Drivers must qualify to enter this race, 147513 Bomb Rack, Mk XXXI, under F. Copies not distributed which will be limited to 40 competitors. each lower wing allowed two Mk.l, 1 Office use, leftover, unaccounted. Qualifying started during the 1981 Mod. 2, 116-pound demolition bombs spoiled after printing 698 471 Nationals for 1/12-scale, and additional to be carried. For practice, a single 50975 2. Returns from News Agents 1.235 1.331 qualifying races will be held in Cleve­ Bomb Rack, Mk. XXI, attached to the left G Total (Sum of E and F — should land, Los Angeles, and Orlando. wing only, could carry ten Mk IV prac­ equal net press run shown in A) 43,672 39.135 For further information, contact the tice bombs. A tail hook was installed for 1 certify that the statements made by the above are correct Electric World Championships Com­ carrier landings. and complete Wm C Northrop. Jr . Publisher mittee, Public Relations Dept., 420

110 MODEL BUILDER IN THE BEST CIRCLES, IT’S tille r

A PRECISION INSTRUMENT FOR THE DISCRIMINATING MODELER

Safe, Rear Draw-Bar Clutch Available in seven satin anodized handle colors: Precision, Instrument-Quality Materials silver, blue, red, green, gold, copper, violet. Complete set in fitted hardwood case: includes Strong-Holding Advanced Collet Design uber Skiver, together with two vials containing Non-Rolling Hex Cross-Section four No. 11, and one each of Nos. 10, 12, 15, and 2 0 ...... $14.95 Deeply Knurled, Non-Slip Grip Individual handles (specify color) $5.95 Long-Life, Stainless, Vial of 6 blades (No. 10, 11. or 15) $2.10 Surgical Steel Blades (No. 12 or 20) $3.30 20 £ See your dealer, or order direct. Dealer inquiries are invited. MODEL BUILDER PRODUCTS All direct orders sent postpaid in U.S. California residents add 6% sales tax. 621 West Nineteenth St., Costa Mesa, California 92627 November 1971 December 197 1 Jenuary 1972 Nancy. R/C soarer. Curtiss-Wrigh! Juntor SHOCer F/F by Mel R/C Pattern World R/C 2" scale. Schmidt. Championships. R/C Twin Trainer White Trash, famous IPeanut Fokker D VI. 75" span, lor 40's. R/C soarer. ILSF Tournament story Peanut Laird LC-DC. Peenut Ord-Hume. Bi-Prentice. R/C bipe Volksplane 3V-1 Chet Lanzo's famous trainer. 3 views. rubber Puss Moth. How to build light Curtiss Robin 3-views. "wire” wheels

Vol. 1. No. 2 S3.00 Vol. 1. No. 3 $2.00 Vol. 2. No. 4 $1.00

February 1972 Mer/April 1972 May 1972 Seahorse II, R/C sea Minnow U/C profile Yankee Gull R/C glider plane. For .19-.35. scale rac-. 8' to 12' span D.H Humming Bird, Fokker E-1 ^ iC scale Miss Cosmic Wind. QM A! Vela s O Boy 1/2A R/C Pylon racer F/F or R/C pulse. E-Z Βο· O A, Al Vela. Peanut Scale Bucker Peanut Fokker V-23. Peanu d Fliwer. Jungmann. Whetstone 1/2A U/C Fibe ting over balsa, Siebel 1/4A F/F scale. combat. Ryan ST 3-views. by L e Gray Mr Mulligan 3 views Spoiler. FAt Combat. FAI power "Folder " Tethered Cars. R/C sail.

Vol. 2. No 5 S3.00 Vol. 2. No 6 $100 Vol. 2. No. 7 $2.00

June 1972 July 1972 August 1972 Bob White Wakefield. Fairchild 51, 1" scale, Bonzo stand«- ' R/C Mongster QM biplane R/C or F/F. sport pv^acale. R/C pylon racer SAM 5 A/2 t'rd ic . Counterf« O ailless Calif. Coaster R/C 1912 A v rr^^ ubber. A/1 0 Jic. glider. Sheet wing. Coman-^.Qj stand-off Shoes- s / R/C QM. Three profile Peanuts. P^viale Pearjp aylorcraft on Daperdussin 3-views. Tr «yiir 2000 2" scale **«. also big one. Pasco Special 3-views. H/C. by Editor. Fairey Delta 3-views. Chester Jeep 3-views.

Vol. 2. No. 8 $3.00 Vol. 2. No 9 ' $4.00 Vol. 2. No. 10 $4.00

MODEL BUILDER MODEL BUILDER MODEL BUILDER MODEL BUILDER MODEL BUILDER + OLDIES + MODEL BUILDER \ (BUT STILL GOODIES!)

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 Put a check mark ( ) by the back issues you SPECIAL I I ! ! May 75 3.004 wish to order. Magazines will be mailed by Sec­ 75 1.254 Jun. ond Class, postpaid. Foreign orders (except AP MODEL BUILDER MAGAZINE'S Jul. 75 O 1.254 O and FPO) must add 40tf per copy. Allow a- Aug- 7502.004 BACK-ISSUE SALE ! ! Sap. 75 01.254 bout four weeks for delivery. If United Parcel Oet. 75 01.254 Service (UPS) is desired, add $1.25 minimum • ANY ISSUE MARKED WITH "o" 75 Cents! ; Nov. 7501.254 for up to two magazines, or add $1.25 plus • ANY ISSUE MARKED WITH " ·" 50 Cents! j Dm . 7501-254 35tf for each additional magazine on orders for Jan. 75 01.504 three or more. Send check or Money Order (no Feb. 7501.504 k ...... λ cash or COD’s, please). U.S. funds only. Master Mar. 7501.504 Card or VISA accepted. Include card number, Ne*. 71 $3.OOf I May 7301.001 ) Apr. 7401.004 I 7501.504 Apr. expiration date, and signature. Dm . 71 2.001 ) Jul. 73 · 1.004 ) May 74 1.004 I Jun. 7501.504 Aug. 7301.004 I Jun. 74* 1.004 ) Jen. 72 01-001 I Jul. 75 01.504 Sap. 73 « 1.004 I Jul. 74 01.004 I Aug. 75 through N am ·-. ______Oct. 73· 1.00( I Aug. 740 1.004 I 75 1.504 72 1.001 June , I OVA · I Net. 7301.004 I S/O 74* 1.004 ) May 72 2.004 I Dec. 77 and Addreee: Dm . 73* 1.004 I Nov. 7401.001 ) July 78 sold out Am . 72 3.004 I Dec. 7401.001 I A ug 78 - Dec 80, Jan. 74 01.001 I less O ct. 78 City: Stat«: Jon. 75 02.004 ) each $2.00( J 74 1.004 Feb. * I Feb. 75 2.004 ) Jan 81 to present Mar. 7401.004 I each $2.50( ) Mar. 75 2.001 I PLEASE PRINT/ z i p : . MODEL BUILDER, Box 335, 621 West 19th St., Costa Mesa, CA 92627

112 MODEL BUILDER MODEL AIRPLANE

MAGAZINE c o l u m n is t DON “ GIANT STEPS” GODFREY SAYS: “I’M A TRUE BELIEVER”

I'm a true believer! I will be the first to admit that it took me awhile to get used to this "new tangled" stuff called “ Hot Stuff” and without realizing it, I began using it more and more and more for those menial tasks that used to take so long. Hot Stuff is the kind of glue that creeps up on you and takes over your entire method of building R/C aircraft, whether large or small. Time is my most precious commodity when building giant model aircraft and I owe the completion of my B-25 Mitchell bomber, 12', 4" span, in only four months largely to S u pe r‘T’ Hot Stuff. There are a thousand and one ways that I used Super T on this B-25 and you might consider Hot Stuff as being that “ other hand” that you've always wished you had! Whether running stringers or sheeting, or somply fabricating an important part for your project, I would recommend that you try Super ‘Τ’, the gap-filling, super-strong, RELIABLE space age model helper. You’ll never have a better friend in your workshop, so take it from me, Don Godfrey... your "Giant Stepper" friend. Get Hep, get smart, and enjoy building all over again... with my best shop buddy... SUPER T.

International Miniature Aircraft Association, Inc.

“ YOU’LL NEVER HAVE A BETTER FRIEND IN YOUR WORKSHOP”

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M R C © Model Rectifier Corporation 2500 Woodbridge Ave., Edison, New Jersey 08818