[R/C ELECTRIC FLIGHT SYSTEMS*__ ) from A L L B A L S A

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$38.00 FIELD CHARGER

NEW MARINE SYSTEMS (Astro Pup) ASTRO - 020 ASTRO -10 This is the answer to your battery problems. Two ASTRO-23 *19.95 F.F. ASTRO 15 $22.95 R.C. years of development by the company that k tows batteries best — Astro Flight — has resulted in a great little unit that will: • Charge your receiver in 15 minutes. • Charge your transmitter batteries in 15 min. • Test for a high resistance cell in two min. • Test for a shorted cell. • Indicate the capacity remaining after a day’s fly­ ing in 10 minutes. MOTORS SYSTEMS • Measure the capacity of a fully charged battery in ASTRO $10.95 $27.95 10 minutes. SPECIAL TWIN PACKS This unit tells you what you have and allows ASTRO-02 $ 30.00 ASTRO 10 $32.95 $59.95 you to do something about it at the field, not ASTRO- 5 $ 50.00 ASTRO 15 $32.95 $84.95 after you get home. This unit obviates the ASTRO-15 $115.00 need for battery discharge units, expanded ASTRO 25 $44.95 $99.95 scale voltmeter and quick chargers. ASTRO-25 $150.00 Shown Above In Dumas SK20 . $38.00 retail . R /C SAILPLANES AND ACCESSORIES A S -W 1 5 High Performance — Std. Class

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MONTEREY Noldt Closed Course World Record of 189 M Perfect Thermal Trainer and Thermal and Slope Soarer Good Competition Plane DLL BALSA SPRUCE $34.95 CONSTRUCTION ? CHANNELR C Stake, line. reel, parachute, all hardware SPAN — iw r included. Std. Hi-start, 100 ft. Surgical $25.95 2 Channel R'C AREA — (00 Sq In. Tubing — $29.95. Astro Start — for big FLYING WT. — 30 Ot. planes — 100 ft. Bungee — $34.95 % FLYING MODELS for those who insist on the VER Y B E S T

CONTROL LINE CONTEST AND SPORT MODELS

P-40 TIGER SHARK S13.95 Span: 42" Eng: .19 to .35 Kit S-50

HAWKER HURRICANE S13.95 Span: 42" Eng: .19 to .35 Kit S-51

NOBLER S24.95 ” Span: 50" Eng: .19 to .40 Kit N-1 PEACEMAKER SI 5.95 Span: 46" Eng: .15 to .29 Kit N-7 World’s most famous stunt model; winner of hundreds JUNIOR NOBLER $13.95 of contests including many Nationals and World meets. Span: 40" Eng: .19 to .25 Kit N B

SCALE & BEGINNER KITS SCALE & BEGINNER KITS All models feature large stunt wing PRO-FLITES JUNIOR ACES U-Control profiles for Vi A Gas engines. MUSTANG $3.95 ' Span: 18" Kit PO-3 γ*·ν LANCER $3.95 " '1 ^ ^ - « Span: 18" Kit PO-1 ^ SPITFIRE $3.95 W jL Span: 18" Kit P0-2 O COSMIC WIND S5.95 Span: 24" Eng: .049 Kit N-12 FORM-FLITES < Scale models for Vi A Gas engines. Superform fuselages. J f l u ZERO S-20 ^ HELLCAT $4.50 | B Span: 18" Kit S-21 THUNDERBOLT $4.50 \ Span: 18" Kit S-22 4 M

JIGTIMES (Rubber Powered) Build ’em and fly ’em in an hour. PIPER VAGABOND $2.95 , 3 * Span: 18" Kit TF-2 RASCAL 18 $2.95 Span: 18" Kit TF-1 STINSON SENTINEL $2.95 MUSTANG P-51B S5.95 Span: 18" Kit TF-3 Span: 24" Eng: .049 Kit N-11

SEND 250 FOR 8 PAGE CATALOG PLUS MONOKOTE SAMPLE 2635 S. WABASH AVE. TOP FLITE MODELS, INC. CHICAGO. ILLINOIS 60616

APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 1 M ACS ANNUAL 1976

SATURDAY MAY 1st

A NON SELLING SHOW

THE W ORLD’S LARGEST HOBBY SHOW! Hundreds of exhibitors, demonstrating thou­ sands of brand new products and ideas for your leisuretime pleasure.

Continuous Indoor and Outdoor demonstrations by world renown experts.

EXCITEMENT EVERY MINUTE!

* Radio controlled airplanes, boats, cars and helicopters in action plus u-controls and free flights!

* Gigantic working model railroad layouts in all popular gauges!

* Plastic models—Rockets flying!

* CRAFTS of all descriptions . . . Jewelry Macramé - Decoupage - Paper tole - Eggury Stitchery Candlecraft · Ceramics and more HOBBY CONTEST OPEN TO THE PUBLIC NO ENTRY FEE! Hundreds of Awards! Stop by your local Hobby Shop i for complete Details._____

ANAHEIM CONVENTION CENTER ______(A cross From D isneyland) Although introduced less than a year ago, the Kraft .61 has already es­ tablished itself as the leading .61 cu. in. contest engine. It was used by 5 out of the top 10 finalists in Class D Expert at the U S. Nationals. In the highly competitive Las Vegas Tournament of Cham­ pions, it was selected by 11 out of 23 contestants (over twice as many as any other engine). At the large Tucson Winter Nationals, it took first and second place, and 5 out of the top 10 At the Tan­ gerine International R /C Cham­ pionships, again first place; most recently at the first major contest of the year, the South­ western R/C Championships, it placed first and second. Contest winning is, of course, an important indicator of engine perform­ ance. Perhaps more important to the day to day sport flyer, is long life, de­ pendability, and ready availability of parts and service. These are assured with the Kraft .61 because it is produced in the U S A by a dedicated group of R/C enthusiasts We believe it to be the world's best .61 cu. in. R/C engine.

WRITE FOR FREE CATALOG

K r a f t Worlds Largest Manufacturer of Proportional R/C Equipment J L SYSTEMS. INC. 450 WEST CALIFORNIA AVENUE, P.O. BOX 1268, VISTA, CALIFORNIA 92083 MODELS BUILDER presents the MASTER MODEL BUILDER

Send all entries to: of the month MODEL BUILDER/PANA-VISE CONTEST 1105 Spurgeon St., Box 4336, CONTEST Santa Ana, California 92702 COLBERT INDUSTRIES, manufacturers of PANA-VISE, the unique hobby vise which turns and tilts to any position, in conjunction with MODEL BUILDER magazine, is sponsor­ ing a design com petition for MODEL BUILDER readers. This monthly contest will be judged for originality and/or craftsmanship for all types of models (excluding plastic static scale). Entries will be judged purely on the basis of photo­ graphs and drawings supplied by the builder of the model. Emphasis in judging w ill be on originality, technical achievement, and craftsmanship, as found in the submitted material.

A MODEL 301 PANA-VISE WILL BE AWARDED EACH MONTH TO THE WINNING ENTRY 3. If photos cannot offer sufficient information about the model, the construction drawings may also be submitted. Drawings should be dean, pencil draw­ ings with all pertinent dimensions indicated. A print of the drawing is acceptable. 4. A written description should be included with photos and drawings, explaining in fair detail any unusual features of the design, and explaining any unique technical difficulties that the model may have achieved. 5. Please do not submit any designs that have been accepted for use in another publication. MOD­ EL BUILDER requests first option on publishing any submitted design. Payment for published designs will be at our regular rates. Any prizes awarded do not represent an agreement to publish any design. 6. Entries will be judged by the modelers on Requirements for entries: MODEL BUILDER'S editorial and art staff, and all 1. Any type model may be entered (aircraft, cars, decisions of the judges will be final. boats, etc.). Kits may be entered if significant modi­ 7. Postage must be furnished if return of sub­ fications have been made to the stock kit. mitted entries is desired. 2. Do not send the actual model. Send only black 8. Deadline for entries in the first contest of the and white photos, showing at least three views of series is July 1, 1975, and winners will be announced the model. Include some familiar object in at least in the September 1975 issue. Subsequent entries will one photo to indicate the size of the model. Try to be due the first of each month and winners will be include photos of any significant details. announced the second month following each dosing.

April’s winner is JOHNNIE SMITH, Massillon, Ohio. His entry is a Curtiss HS-2-L flying boat, the first operational aircraft used by the U. S. Navy. The 56 inch span model is built of bass wood, with fittings and engine built from brass. Wings have fabric sag sanded into surfaces, with rib tape over rib lo­ cations. Struts are spruce, while cannon/ machine gun and radiator are brass. Fin­ ish is fiberglass undercoat with enamel and lacquers for the finish colors. Model was built for the Smithsonian Institution to commemorate the 50th anniversary o f Naval Aviation. 4 MODEL BUILDER M O D E L 0 APRIL 1976

BUILDER volume 6, number 52

1105 SPURGEON. BOX 4336, SANTA ANA. CALIFORNIA 92702 (714) 547-3963

STAFF CONTENTS

EDITOR FEATURES Wm. C. Northrop, Jr.

GENERAL MANAGER WORKBENCH, B ill N o r t h r o p ...... 6 Anita Northrop EDITORIAL ASSISTANT OVER THE COUNTER,T a y lo r C o llin s ...... 7 Lc Gray “ IS SOARING FOR THE BIRDS?” (Part 3), J im G r a y ...... I0 ASST. GEN. MANAGER Dawn Garrott REMOTELY SPEAKING, B ill N o r t h r o p ...... 14

ART DIRECTOR PRODUCT $ IN U$E, B ill N o r t h r o p ...... 17 Paul Plecan PLUG SPARKS, J o h n P o n d ...... 18 SECRETARY L. Gordon CHOPPE R CHATTER, J o h n T u c k e r ...... 24

SUBSCRIPTION MANAGER R/C SOARING, Le G r a y ...... 26 A. Valcarsel MODEL ROCKETRY, D o u g la s P r a t t ...... 32 CONTRIBUTORS CONTROL LINE, D an R u t h e r f o r d ...... 36 Rod Carr Fernando Ramos F/F SCALE, F e rn a n d o R a m o s ...... 42 Chuck Hallum Char Rohring Bill Hannan Dan Rutherford HANNAN’S HANGAR, B ill H a n n a n ...... 44

Walt Mooney Bob Stalick FREE FLIGHT, B o b S t a l i c k ...... 50 John Pond John Tucker STRICTLY SAIL, R o d C a r r ...... 56

ADVERTISING REPRESENTATIVES R/C AUTO NEWS, C h u c k H a llu m ...... 58 WEST Bob Upton, 20626 Clarendon Ave. Woodland Hills, California 91364 SCALE VIEWS 12131 884 2294

EAST: Walt Moucha. 38 Coppersmith Rd.. CURTISS A-8 “ SHRIKE”, Peter W estburg ...... 29 Levittown, New York 11 756 KALININ K-4, Dave S t o t t ...... 46 (516) 796-4898 JAPAN: World Media, Inc., Eiji Noguchi, CONSTRUCTION Director, Chinatown Bldg. 202, Yamashita-cho Naka-ku, Yokoha­ ma (231), Japan. Tel (045) WEST'NER, D r . D . B . M a t h e w s ...... 11 662-8128. Cable WOMEDIAC. CABRULER O.T., H e n ry S t r u c k ...... 23

PROFILE GUARDIAN, Bill M e lt o n ...... 33 Subscriptions $15.00 per year, $27.50 for two years. Single copies $1.50. Add S2.00 VACUUM MOLDING TABLE, Ron W illiam s ...... 38 for postage per year outside of U.S. (Except APO) Add 75 cents for Canada and Mexico. PEANUT SAAB MFI-17 SAFARI, C h a rle s R o t h ...... 47 Copyright 1976 by MODEL BUILDER Magazine. All rights reserved. Reproduc­ FLYING DIAMOND, K e n W i ll a r d ...... 54 tion without permission prohibited. Published monthly by MODEL BUILDER Magazine, 1105 Spurgeon, Box 4336, Santa Ana. Calif. 92702. Phone (714) 547-3963. Cover: This Travelair 2000 was built by Bob Stoddart, Gardena, California, from your Change of address notices must be received MB Editor’s plans; first published in Nov. 1965 M.A.N., and then in July 1972 MODEL one month before date of issue that new BUILDER (Plan No. 7724, $4.00). Powered by a Supertigre .71 R/C turning a Top Flite address takes effect Send old address with 16x6 prop, the ship weighs 9 pounds. Top wing span is 69 inches, paint is Aerogloss, new: old label preferred Post Office w ill not D/J striping, turnbuckles and fittings by Proctor, Williams Bros, wheels. S & O 6-channel forward copies unless you pay extra postage. radio. Kodachrome 35mm transparency by Stoddart. D uplica te issues cannot be sent. Second Class postage paid at Santa Ana. Ca. APRIL 1976 5 ■front

It is again (crunch) that time of (grunt) year when the hobby trade ("Q uit shovin!") shows take Bill place. New products, model ("You're stepping on my toe!") displays, and meetings w ill bring modelers from ("S'cuse ME. lady!") all parts of the country. They're a great way to break up the Northrop* long ("You say that %&*@tS hot dog cost 75 cents!?") winter months. ing these consumer-attended shows to shop in his 12th story apartment on 5th w o r k b e n c h be more productive for sales as com­ Avenue. • · · pared to the giant Hobby Industry As­ On Monday, we spent most of the sociation Trade Show in Chicago (for day around Times Square, window dealers and distributors only) where toy shopping and souvenier hunting, until IT ’S SHOW TIME! manufacturers write their whole year's time to head for JFK Airport and the • That time o f year is upon us when, business. Whether you realize it or not, flight back to California. because the weather in most parts of the you’re lucky . . . The nation’s dealers NEW AT MB country is detrimental to active, outside and distributors decide what toys your Beginning this month and continuing participation, the modeling fraternity kids will have, but you decide what MODEL BUILDER’S policy of looking gathers together indoors to renew old items your hobby dealer will do best to into all phases of modeling, we are in­ acquaintances and to see what the man­ keep in stock. If you don't create the troducing a series of articles on model ufacturers have to offer for the coming ultimate destination for the manufac­ rocketry. Model rocketry has been with season. turer’s product, there ain't no use in us for some time, but except for some Tsvo o f the four more or less primary him making it! material that was published in the now- gatherings have already taken place; the defunct AAM a few years ago, it has had sound-alike RAMS o f Seattle, Washing­ MODEL BUILDER’S Editor/Pub- little recognition in the model press. ton, and the WRAMS of White Plains, lisher and General Manager attended the Actually, we should say American New York, on February 7 and 8, and on WRAM Trade Show in White Plains, an model press, because in our magazine February 28 and 29, respectively. old stomping ground o f the editor’s exchanges with model publications from The largest show/gathering o f them back in 1949 and 50. Not to take any­ other countries, particularly in Europe, all, and the one which started the whole thing away from this excellent show, we find consistent coverage on model idea some 22 years ago, is the Toledo one reason we like to go to White Plains rocketry. In fact, if it weren’t for that, Weak Signals R/C Club Exposition, is to make the “ Lobster Run.” Both of we’d hardly be aware of the fact that it which will probably have taken place by us being former Easterners, we look for­ has reached International and World the time you read th is . . . on April 2, 3 ward, on Saturday evening, to driving Championship status, and the advanced and 4. Following that, comes the up to "Skipper's,” a seafood restaurant stages of the hobby are extremely exo­ MACS, on May i and 2, in Anaheim, right on the water in Norwalk, Connect­ tic, with radio control, multiple-stage California. icut, and gorging ourselves on steamed firing, live cargo, and the like. Although these shows have been orig­ Maine lobsters (we each ate 2-1/2!). inated by and for radio control mod­ And while we’re on the personal Model rocketry had its growth prob­ elers, we, as an all around model maga­ s tu ff. . . Anita, being a former New lems, just like gas modeling (both went zine, are glad to see free flight and con­ York City “Cliff Dweller,” who would through early stages of being banned in trol line entering the scene. It started go back to live there at the drop o f a some states), but is now enjoying a great with model exhibitors, then organiza­ hat, couldn’t pass up taking another deal o f popularity, especially among the tions, such as SAM (Society of Antique look, since we were so close. As fortune younger modelers. It is our hope, that Modelers), and finally, non-R/C manu­ would have it, Nicky Wyeth, son of the by publishing material on model rocke­ facturers have been appearing. As an ex­ world-famous American painter, try, we will attract still more readers, ample, but not to single out any one Andrew Wyeth, both of whom, if you’ll who will then see what other interests manufacturer, Tern Aero had a well- excuse the name-dropping, are on our list there are in the field of modeling. We all attended booth at Toledo two years o f special friends we are most proud to need each other! ago, and Phil Koopman’s Vintage Aero, claim, invited us out to dinner, with his Doug Pratt, of Raytown, Missouri, with new and replica rubber powered wife )anie, at Trader Vies in the Plaza w ill spearhead our model rocketry kits, was continually swamped at this Hotel. Nicky is an ardent modeler and series. He has lots o f material ready for year’s WRAM show. engine collector, flies free flight old publication, but we’d like our readers to Hobby manufacturers are also find­ timers and R/C, and has a model work­ Continued on page 92

6 MODEL BUILDER OVER THE COUNTER

^ — ~ 7

/ j / V i • t - Ί " c ” ·. 1 ' Ύ — ------, - · - - · - — / / A/ l / 1[ f c j ] Ί } , A ' 1 i . . ' /

R/C Sport Scale P-47D Thunderbolt, by Top Flite Models.

• The “ Jug” is here! After two years o f keeping WW II stand-off R/C Scale buffs on pins and needles, Top Flite Models, Inc., 2635 South Wabash Ave., Chicago, Illinois 60616, has finally released its P-47D Thunderbolt kit. Designed, built, and flown to several maior contest wins by Top Flite’s Dan Santich, the P-47D spans 60 inches, has 720 sq. in. area, and will fly with .50 to .60 displ. en­ gines, using 4 to 6 channel (retracts and flaps) radios. Price is $79.95. The kit features several unique struc­ tural techniques, including the formed balsa fuselage shells and the tough, two-piece injection molded cowl. One- piece balsa ailerons, flaps and stabilizer are also employed. Fuel-proof, matte mylar pressure sensitive decals, hard­ ware package, full size plans, and an illustrated, step-by-step instruction book­ let round out the complete package. We bet the air will be full of Jugs this summer! * * * In a recent issue, we mentioned that Flat DeBolt was making a limited run (100) of kits for his stand-off scale model o f the famous Caudron racer. De­ signed prim arily for Quarter Midget Plastic props for rubber powered models, from Peck-Polymers. pylon, the model could also be used in Sport Scale, Pattern, and high-speed APRIL 1976 7 * * * The entire Kirn-Kraft line of 1/2A engines, parts, and racing accessories has been taken over by Kustom Kraftsman- ship, P.O. Box 2699, Laguna Hills, Calif., 92653. Half-A racers will be glad to know that the 128 threads/per inch needle valve and spray bar assemblies will be in full production. These fine ad­ justment needle valves are secured in a nylon sleeve which prevents any air leakage around the threads. The fine threads make precise mixture adjust­ ment easy, even with pressurized fuel systems. Kustom Kraftsmanship will also be producing the customized backplates for Tee-Dee .049 and .051 engines. Half-Pint Cruiser for .049 engines, by Dumas. These backplates, which are anodized in distinctive red color, are fitted with a pressure fitting which has a .010 inch orifice. This extremely small hole pro­ vides an ideal amount o f pressure to provide even fuel flow. In addition to the 1/2A accessories, Kustom Kraftsmanship offers a line of engine accessories for larger engines. Two Rossi .15 accessories include a snorkel-type venturi which eliminates the fuel surging associated with stock Rossis run on pressure. Another item is a head insert, which allows conventional glow plugs to be used in place of the head insert type plug that is standard on the Rossi. For more information on the complete Kustom Kraftsmanship line, see your dealer or write directly to Joe Klause. * * * Carl Goldberg's traveling goodwill ambassadors, Bob and Doris Rich, have been asking modelers all over the coun­ Skevee 10, 18 inch long V-bo»tom ski boat by Dumas, for .049 engines. try what accessories they would like to see produced. Among the items asked buzzing around. The immediate popu­ formers, formed wire landing gears, strip for and produced, are steerable nose larity of the kit made it impossible for hinges, all hardware, full size plans, and gear assemblies in two sizes. The Hal to lim it the kit production . . . a instructions. medium size unit uses 1/8 inch music nice predicament to be in! Ship is one-piece construction, al­ wire, and a companion nosegear bearing The kit is a modeler’s dream . . . though a removable power pod gives im­ and steering arm. The larger size now parts are machine-finished to size, fin­ mediate access to the engine, fuel tank, features an adjustable axle, allowing the ished maple engine and fuselage and R/C installation. Span is 41-1/2 5/32 inch wire strut to be cut to any crutches, finished pressure cowl and pod inches, area is 340 sq. in., weight 2-1/2 length. Also offered are 1/16 inch aile­ parts, machined wing ribs and jigs, pounds, 3 to 5 channels, and .15 power ron pushrods with 2-56 threads which shaped fuselage sides, bulkheads, and . . . natch. Price of the deluxe kit is $42.95. allow direct connection to servo output

New control line handle by Fox Mfg. Ross· and Cox accessory parts by Kustom Kraftsmanship.

8 MODEL BUILDER Compete-Tote field box by Custom Craft Products. Replica kit for the Modelcraft Soaring Glider of the 1930's is being produced by CPM Products. arms without having to enlarge the ding resistance. A total of eleven new producing two new power boats de­ holes. Another clever item is their push- items have been added to the line, in­ signed for .049 power. The Skevee 10 is rod connectors, which attach to a servo cluding frequency flags, landing gear an 18 inch long, Vee-bottom ski boat. output with a nylon snap nut. A simple straps, strip aileron horns, wheel retain­ The Vee bottom can even handle rough lock screw arrangement locks down on ing springs, and solderable clevises. For water for competitive racing. The Half- the wire pushrod, allowing easy length more information see your dealer, or Pint Cabin Cruiser also has an 18 inch adjustment. Since the wire rod does not contact Carl Goldberg Models, 4736 hull. With an .049 engine, two channel have to be cut to exact length, the in­ West Chicago Ave., Chicago, Illinois, radio, prop and ‘cool clamp’ water cool­ stallation time is very short. Goldberg is 60651. And tell ’em MODEL BUILDER ing for the engine, the Half-Pint is a also offering molded skids for use on sent ya! good choice for a beginners R/C boat. wing tips, or as extra protection for the * * * Both kits are o f all wood construction, tail on tricycle gear installation. For re­ The economy of Half-A engines is and retail for $14.00. inforcing wing center sections, they are not only catching on for R/C airplane * * * offering nylon tape in 4 and 6 inch flie rs. . . it has also h it the boating The Compet-Tote, from Custom widths. When applied with epoxy, the world. Dumas Products, 790 South Park Craft Products, is now available in kit tape provides incredible strength and Ave., Tucson, Arizona, 85719, is now form. This compact field box includes model support saddles that will safely support any size model. Special fuel re­ sistant foam rubber cushions are pro­ vided to protect the model from ’dings’. The plywood and particle board parts are precut for easy assembly. Space is provided for a one gallon fuel can, and two equipment sections for tools, star­ ter, batteries, and similar paraphenalis. If your hobby dealer doesn't have the Compet-Tote, it can be ordered direct from Custom Craft Products, 19 Flor- gate Rd., Farmingdale, N.Y., 11735. Price is $14.95, with a $1.50 postage and handling charge. * * * Hal deBolt’s Quarter Midget Caudron racer, now in full kit production. Fox Manufacturing is now offering the first significant change in a control­ line handle in many years. The handle offers adjustable line centering, two position line spacing (to allow for in­ creased or decreased control sensitivity), and a virtually indestructible design. The formed steel strap handle is fitted with what appears to be mahoghany grips. A wing-nut clamp holds the stranded steel lead lines firm ly in posi­ tion, yet allows easy adjustment. The Fox No.8000 Control Handle will be available from dealers everywhere for $3.95. For further information contact Fox Manufacturing, 5305Towson Ave., Fort Smith, Arkansas, 72901. * * * Sku .. er, Pole Cat R/C trainer, by Prather products, for .10 to .19 power. Continued on page 89

APRIL 1976 9 IS SOARING FOR THE BIRDS?” By JIM GRAY . . (Part 3): Continuation of a series on birds that soar, and what we can learn from them. Required reading for R/C sailplaners.

not? The Wrights proceeded cautiously near the tips. In a vulture, for example, and carefully, making exacting observa­ the metacarpal bone consists o f a tri­ tions, taking their lessons from natural angular, trussed structure; very much soaring, and trusting nothing that man like a triangular television antenna tower had earlier held to be true. If one of the type having criss-cross or spiral wishes to fly, then nature may be his bracing holding the three legs together • I’ve often wondered what advantage best model or pattern. formed by the wings: similar to a pair a gull-shaped wing has over a straight Looking at the gull-shaped wing from of parachutes, with the body suspended wing, other than esthetic value, that is. the front or rear view, we see the body between them. This would appear to We’ve already speculated about lift dis­ as if it were suspended between two give excellent roll stability, together tribution, soaring ability and the like, inverted “ U” -shaped arcs. It occurs to with somewhat of a parasol effect, while but I’m convinced that there is still me that the naturally downwardly curv­ retaining substantially full projected another “plus" for this shape. It is ing shape o f a gull’s wing (inverted area. The anhedral tips incline rear- inherently stable, particularly gust-stable. U-shape) may also serve another useful wardly in side view and slightly down­ In their early experiments at Kill Devil purpose o f a structural nature. Consider wardly, below the bird's centerline; Hill, the Wright brothers employed un­ a cantilever beam; that is, a beam while the top portion o f the "U ” -shaped manned tethered gliders designed to lift attached at one end to a support. This arc projects above the bird’s centerline, and stabilize overhead in the lift flowing is analogous to a birds wing. The slightly ahead o f the c.g. The areas up the hill face. Tethers or ropes were compression lines approach the bottom appear quite well balanced about the fastened to each wing to prevent the surface perpendicularly, smoothly curv­ c.g., permitting neutral yaw stability; glider from rising further or from getting ing from the “ roo t” where they are yet rotation of the tail to provide fin away; and, when conditions were right, parallel to the surfaces. Likewise, the and rudder area aft of the c.g. provides the glider would rise and hover motion­ tension lines meet the top surface per­ immediate “ weathercocking” for the less directly overhead. pendicularly out toward the tip, while bird. The initial act of tail rotation The Wrights often experienced side- lying parallel with the surfaces at the tends to overcome the parachute stability gusts and destabilizing turbulence. Their root. If we now carve away all of the in roll, permitting some change o f direc­ first attempts to correct and overcome beam structure, leaving only the com­ tion and steering. I think that it would this difficulty was . . . as you might pression lines, the resulting shape is that be very interesting to find out from Rod expect . . . to add dihedral. However, of a gull wing as seen from the front and Mark Smith if any of these effects that proved totally unworkable. The view. It appears then, that the gull were discovered during their efforts to problem was corrected finally by making wing is shaped in this fashion to take build and fly "Jonathan Livingston the wings anhedral, that is, negative bending stresses in the upward direction, Seagull.” dihedral; approximately six inches in a meeting them everywhere equally, yet STRUCTURE thirty-foot span. Modern designers have in the lightest possible manner. If the Bird bones are tubular; that is, they eschewed anhedral, perhaps for well- time arises when the gull needs to fly are round in cross-sections and hollow. founded reasons. However, for slope or inverted, he probably folds his wings They are also flexible, tapered and even dynamic soaring, anhedral may be “ the entirely, otherwise they would likely porous! They are capable o f withstanding way to go” . We won’t find out unless fail under the reversed loads that were loads in virtually all directions, with we try it. Interestingly, the Wrights not designed to be met! How about it substantially uniform deflection. The chose the slope o f the hill so that the J.L.S.? tension and compression stresses pro­ direction o f airflow coming up the slope Bamboo is a light, fibrous, tapering, duced by the bending loads are absorbed would strike the wings at precisely the tubular structure which is also some­ in the walls o f the tubes and by the tubes proper angle of attack, so that the what porous. Very similar to the long yielding elastically, without failure. Lines glider could rise while trimmed perfectly bones of a bird’s wing! The major o f zero stress are found along the center- horizontal to the ground on the “ pla­ difference is that every few feet along line o f the tube where the bones are teau” at the hilltop. As I recall, this the length o f the bamboo, there is a hollow. Nature economizes. angle was reported to be on the order of circumferential “ ring.” This ring tends Tapered tubular spars are almost ideal­ seventeen degrees. It occurs to me that to hold the fibers o f the tube in place ly suited to meet stiffness requirements sea birds are "designed" to soar under under bending forces and acts as a for a wing with minimum weight. The conditions o f laminar air flow and slope stiffener against buckling failure. From principle is illustrated by rolling a sheet lift; can it be that anhedral provides the these examples, I would like to see of paper or thin balsa into a tube, and necessary stability under these condi­ someone build a tapered, tubular fiber­ testing stiffness; that is, resistance to tions? Why not research the matter glass spar with ring stiffeners spaced bending. Failure o f such a structure is by with an R/C sailplane? Dihedral is not along its length, in the manner of buckling under extreme bending loads. needed for soaring birds to make turns, bamboo. If the spar passed through Prior to failure, a pronounced lobe ap­ inasmuch as they possess “ full-span holes drilled in each rib, of course, then pears on the compression surface. The ailerons” in the form o f wing-warping the rib itself acts as the ring stiffener. long, tapering tubular “ spars” o f a bird’s ability. Speaking of that, why don’t Such spars in a sheeted foam wing wing are nearly ideal for resisting the sailplaners try wing-warping for con­ would produce an exceptionally strong loads of ordinary soaring flig h t.. .and trol? (Astro Flight is about to market structure. even the loads imposed by flapping. . .at pivoting wing panel devices for aileron­ In a bird, especially a soaring bird, the very minimum weight possible. The like control, wen) The Wrights used it the small bones of the “ hand” must quill o f a feather is another illustration of very successfully with their thin take the stresses of the pinions and of bending flexibility, in which the deflec­ “ cambered plate” airfoils. It seems to flapping. Simple tubes of the type tion is also coupled to a torsion mode, so me that modelers could use thin airfoils found further inboard are no longer that in tip pinions for example, the and aero-elastic structures, too. Why adequate to resist the forces applied Continued on page 77

10 MODEL BUILDER

12 FULL SIZE PLANS AVAILABLE - SEE PAGE 94 MODEL BUILDER to ply filler. The landing gear is formed using a good vice-grip plier, and wrap­ ped onto the ply cross pieces in front and rear. This assembly should be epo­ xied in place, and the thread wrapping smeared with the epoxy at the same time. Allow glue and epoxy to set, then remove fuselage frame from surface. I prefer to leave the masking tape in place as long as possible to avoid loosening the cross pieces accidentally. Add deck formers, E, F, G, and H, stringers, stabilizer saddle, actuator mount, fire­ wall, nose blocks; and sand fuselage to contour. The actuator and radio gear should be installed temporarily, following Ace’s (allow slot for C). Add vertical 1/8 x everything at 90° angles, holding posi­ instruction book. The torque rod is 1/8 balsa and diagonal l/1 6 x 1/8 balsa, tions with masking tape, clothespins, made up of 1/8 x 1/8 spruce, with wire allow to set up, then repeat, building and T-pins. When glue is set, mark the bound on each end, then threaded from second side directly over the first. Allow mid-line on the bottom (surface up) of front to back before bending rear loop. the two sides to set at least 8 hours A, C, and D. Place a straight edge on Leave a considerable length on the rear before removing from plans. this mark and pull tail together at wire, which will allow you to thread Separate the two halves by popping mid-line. D-4 is glued and held together, much more easily. Use torque rod bear­ apart gently with a table knife. Trial fit at rear, with clothespins, then cross ing tubing (Ace) on cross piece and at B, C, and D into appropriate slots, then members are fitted top and bottom. the tail post. Position actuator on its glue permanently. Invert and position Diagonals are added to bottom, as are mount and insert into loop on the wing rail on building surface, use a the cross sheet fillers. torque rod. Check for free motion and triangle and carpenters square to align The tail skid is formed and epoxied position rear torque tube (I use Hot Stuff). Do not bend rear wire until final assembly. Front hatch is made o f two layers o f 1/4 inch sheet, and 1/2 inch triangle balsa. The windshield frame and hatch are best made up directly on the fuse­ lage. The undercarriage fairings are best made by drawing the outline from the wire onto 1/16 ply. The fairings are Hot Stuffed in place then covered with two layers of silk during covering. Drill holes for 1/8 dowel wing hold downs, but do not glue until the fuselage has been covered. Windows are installed after doping. WING Trace wing rib pattern onto thin typing paper, spray with Spray-ment, stick onto 3/32 or 1 /8 ply, cut out, and Continued from page 62

The handiest and most inexpensive modeling clamps in the world; clothespins and masking tape! At this point, alignment is of major importance.

In spite of the small size of the airplane, there's buckets of room for Ace pulser installation. Rear view of actuator mounting shows crank Battery pack is up front with the foam wrapping. linkage. Loose fit is important . . no binding. APRIL 1976 13 Entrance to the Westchester County Center, site of the WRAM trade show, 10 minutes before Digital radio control pioneers, Don Mathis (It) opening time on Saturday morning! and Doug Spreng receive Howard McEntee Memorial Award from Howard's widow, Elinor McEntee. Medals awarded for signifi­ cant contribution in the R/C hobby/sport. allowing more freedom of design. “ For those interested, a copy of the above rules can be obtained from Pylon M M SPEAKING Racers o f Puget Sound (PROPS), c/o Nelson Eddy, 3003 9th St. N.E., Puyall­ R/C News, by BILL NORTHROP up, WA. 98371. “ I’ve been following 1/2A Pylon ever TRADE SHOW NEWS posium, conducted by Vince Caluori, since these guys started doing it, and • As discussed in our “ Workbench” who had a great presentation on the have helped them with engines, blad­ column, il is trade show season, and two aerodynamics of 1/2A pylon planes. ders, props and fuels. A t first, they had o f the four biggies have already taken "All very scientific, yet easy to under­ a lot to learn and it was really funny to place . . . the RAMS o f Seattle, Washing­ stand, and Vince opened a few people’s listen to their doggy engines and pick up ton, and the WRAMS of White Plains, eyes with his presentation,” Dan says. their 30 oz. planes. But they learned New York. "A t the end of the 1/2A Pylon Sym­ fast, and I am willing to bet that no­ In recent years, all of these shows posium, they had a rules-making session body goes faster in 1/2A Pylon, I don’t have become so huge that it is impos­ and have dropped their previous set of care where they’re from. And you can sible to cover everything and everyone rules, which was basically those pre­ quote me on that! (We did. wen). when describing them, particularly in sented in RCM awhile back. Basically "They are now in the process of one issue . . . and it could get a little re­ the Northwest I/2 A Pylon rules, to go planning the International 1/2A Pylon petitious. So, we’ll shoot you some pic­ into effect this June 1st, require 20 oz. Championship Races for Memorial Day tures and mention various ideas and minimum weight, 200 square inch mini­ weekend (May 29th & 30th) and asked products, as they come to mind, in sub­ mum wing area with 7/8 inch minimum me to tell you about it so you could sequent issues. wing thickness at the fuselage (taper to drop a line in about the Champs. (Con­ We couldn’t make it to the RAMS nothing at tips is OK). Any planform sider it dropped, wen) Further info can 11th Annual in Seattle this year, how­ for wing is allowed, which should lead be had by writing to Nelson Eddy at the ever, the "Bothell Bumpkin,” our Con­ to some interesting designs as opposed above address. They have a lot of ex­ trol Line columnist, Dan Rutherford, to the ugly, rectangular planforms pre­ perience at putting on good 1/2A races, untangled himself, from his wires long viously required. ROG not required and are working to make this Champs enough to go take a look. After check­ (flying starts have always been used here their best contest ever.” ing out the manufacturer’s displays, Dan anyway), and landing gear is an option. MODEL BUILDER had a booth at sat in on the 1/2A Pylon Racing Sym­ No scale conformance is required now, the WRAM show in White Plains. This

Best-of-Show at the Seattle RAM show was this Jenny, by Ron Adler, Bruce Christensen, who headed up the RAM show, with his DO-335. of Mt. Rainier R/C Society. Also took first in WW I Scale. HP 61 front, OS 40P back, flaps,retracts, 8' span 16 lbs., EK radio. 14 MODEL BUILDER "Come on, folks, for S125 it's worth it for the retracts alone!" Swap MODEL BUILDER’S General Manager, photographed from the bal- Shop in full swing at all times during the WRAM show. cony, was busy taking subscription and Uber Skiver orders. was our third New York show in a row, line of .15 and .40 engines. Bill Cannon and though we haven't seen the figures, was walking around with a working ser­ it had to be the largest yet, in atten­ vo so small you could hide it under a dance. Last year’s affair was hindered postage stamp. The “ Bingo” R/C sailing by gas rationing and heavy rains, but yacht by Dumas is a beauty. KG L’s new this year the weather was sunny and “ wire” wheels are very neat and rugged. mild, and the modelers really came out They’ll also be available with canvas o f the woodwork! covers. That Lenco Staggerwing Beech is It appeared to us that there were a a real eyecatcher and a new sport bipe few less manufacturers present. It was has been added to the line. Polk’s was felt that the economy pinch dictated showing a new C02 engine, mostly plas­ that some companies could only afford tic, which will sell for $19.95. A test to attend one show, and that one would sample is coming. Also Polk’s was show­ be the huge Toledo affair. ing . . . Are you ready? Four-stroke ra­ People always ask “ What was new?” dial engines in 5 and 7 cylinder configu­ rations! Price? The 5 is $1000.00, the 7 Mr. and Mrs Dave Wallick, of Wallick Indust­ This is a bit difficult to sort out, be­ ries, showing many special engine accessories. cause many new items were really varia­ is $1400.00. Displacement 13.86 and tions on a previous product. Anyway, 19.40 cc, rpm 4,000 and 4,500, weight will be a complete kit with fiberglass our own booth kept us so busy that we 18 oz. and 24 oz. Ralvin was showing a and foam, plus a transmission kit for the can only give a sketchy run-down of positive-action wheel brake, and low contra-rotating 21 inch props. We un­ what was seen. battery warning devices for transmitter derstand the prototype model was A t Ace, we saw a new single-stick and airborne packs. scheduled for first flight tests the week­ transmitter, a Half-A engine mount, and Perhaps the most interesting new end following the WRAM show. a glow driver based on Brian Ellis’ Jan. item was an operating scale model of Craft-Air’s newest is the SD-100 sail­ '76 MB articles. Cox Hobbies, combin­ the Convair “ Tail Sitter” VTOL “ PO- plane, a plastic bodied version of the ing Cox and Airtronics, showed the new GO” , by Steve Snyder Enterprises. This popular Windrifter. Goldberg showed

MODEL a SUrTjO INC

Ben Shereshaw, of Bantam Model Products, C liff Weirick models a pair of wire spoke Control line's engine man, Duke Fox, showing makers of Head Start glow plug. wheels marketed by KGL. Fox R/C .45 with "candy cane" muffler. APRIL 1976 15 Say 'Hello' to Jerry Bonzo, Pro Line’s marketing man, enjoys some- "... and if you don't want to build a wing, they make dandy small thing for a .. er, sore throat at the WRAM show. parts trays." Matty Sullivan explains his molded wing cores.

Tom Runge (left) and Paul Holsten in the Ace R/C booth. Ace is the Hear (Keith Finkenbiner), See (Gil Rifkin), and Speak (Dan Pruss) mainstay of single channel radio control. no evil, manning the LSF and NSS booth at the WRAM show. non-finger sticking cyanoacrylate glue, a ceiver for $99 postpaid. Airborne As­ WHITE ORANGE/WHITE hinge slotting tool, hardened steel wheel sociates now has Don Lowe's Phoenix RS 6612 RS 6461 collars, and the new control line stunt VII, a much improved version of the VI. Kraft 15415 6552 P-40 which may also be flown R/C. 15760 6621 That's just a taste of all the stuff 15807 Kraft 15493 Nothing new about Nitrotane fuel, ex­ that's coming up this year. Following ORANGE 15850 cept that the list of testimonials for its 15944 the Toledo show, we’ll have lo t’s more RS 6851 excellence keeps growing, including 23 to add. 6866 RED/WHITE first place winners at the ’75 Nats. 6876 RS 65 30 Rhom Products electric fuel pump STOP THIEF! 6877 6613 screws on in place o f the fuel can cap. Recently, a substantial number of 6881 6773 6882 6782 Can’t be much simpler than that! Mid­ Hobie Hawk Gliders, completely fin­ west Model Supply (Gerry Nelson) has ished and with radios installed, were YELLOW/WHITE BLUE/WHITE the new HP61FS which puts out 1.6 stolen from the company’s facility in Ir­ RS 6320 RS 6 319 vine, California. The following list is di­ 6790 6405 horsepower, while the HP40F is a mini- Kraft 15706 6504 60 in power at .90FIP. K&S has now vided into glider colors, and under each 15720 6524 added 3/4 inch streamline tubing (35 is a list o f the serial numbers of the ra­ 15731 Kraft 15331 inch length) to its stock o f sizes. Nice dios installed therein. If you spot any of 15733 15532 15827 for those big struts. Walt Good, Don these systems, whether in a Hobie Gli­ 15791 15973 15792 15976 15843 Clark, and Ben Givens, as Soaring Prod­ der or something else, contact MODEL 15857 15989 15853 ucts, Box 117, Kensington, MD. 20795 BUILDER, or Dave Rouse, care of 15937 15996 15854 are now offering their Thermic Sniffler Coast Catamaran, 2026 McGaw, Irvine, 15939 15997 15978 900 series, complete with monitor re­ California 92714. Continued on page 88

Jerry Krause and Jim Simpson of EK discuss sales strategy with Bruce Paton, Chief Engineer at Cox, explains the new .15 and .40, KGL's Jack Yarger. Bob "Skinny" Elliot was getting a diet Coke. and the affiliation with Sanwa Radio and Airtronics. 16 MODEL BUILDER quired comes with the installation of the wiper arm for the speed control. The arm length needed for different ser­ vos may vary, so a long one is provided. Putting a “ Z” bend in the arm provides adjustment for both length and contact pressure. The tricky thing is to combine the arc-shaped path of the wiper contact point with the straight line o f the wire- wound resistor (rheostat) and still have contact along the full length. Further­ more, the drive batteries should be fully discharged d urin g this adjustment period or you’re going to have a jolly time holding onto the critter with its rear wheels spinning like mad! It is also of utmost importance that the wiper contact travels well into the dead, or " o ff" portion of the resistor when the throttle control is completely retarded. This is not only the “ off” position, it is also the brake. The electric motor re­ fuses to budge when you try to turn it The Cox .049 Jerobee chassis and the Leisure Electronics conversion chassis, awaiting the trans­ through the 4 to 1 gear train! fer of parts for electric operation. Radio, axles, wheels and Lexan bumper get switched. Operation o f the Leisure Electronics converted Jerobee is a piece of cake. You turn on the transmitter first (If you PRODUCTS IN USE turn the receiver on first, the wiper may jump onto the speed control rheostat, Leisure Electronics' JEROBEE ELECTRIC CONVERSION CHASSIS either because of interference or just the normal turn-on “ tw itch” , and the car By Bill Northrop could take o ff unexpectedly!), then the • Leisure Electronics, 11 Deerspring, removes the “ C” clips holding the rear receiver, and you're ready to go. Irvine, California, 92714, produces an wheels in place, pulls out the rear axle, Accelerate slowly! With the gearing electric powered version of the well- and transfers the parts to the electric and power o f the electric motor, you’ll known Jerobee 1/12 scale radio con­ chassis. It is important to note that the get "instant spin-out” if you jab on full trolled, Cox .049 powered "Greenwood spur gear supplied with the motor is de­ throttle. The Greenwood Vette, like its Vette.” The car is available with the signed to fit the standard Jerobee 56- prototype, is a racing machine. It is en­ Jerobee radio for $179.95, with the Fu- tooth drive gear. Other gears can cause tir e ly c o m p e titiv e with the .049 taba radio for $219.95, or without binding that might result in overheating powered cars, and on short courses with radio, for $99.95. In addition, for those and possible burn-out o f the motor. many turns, its instant acceleration and who already own a gas-powered Jero­ The front axle arms can be unsnap­ late braking capability gives it almost bee, Leisure Electronics offers a com­ ped from the king pins, and transferred unfair advantage. On longer courses, the plete electric conversion chassis, with to the king pins o f the conversion chas­ gas powered cars may have higher power train, for $57.95. sis without bothering to remove the speeds on the long straights, but the The electric conversion chassis in­ front wheels. The track rod and steering electric will eat 'em alive on the turns! cludes the standard Jerobee chassis bed, arm go along too, without modification. Charging of the electric power drive with the electric drive motor, speed con­ Finally (at least with the Jerobee batteries is easy, once you get the hang trolling wire-wound rheostat, wiper, and radio), the R/C system is switched, by of it and establish a certain routine. A rechargeable power batteries... all undoing a couple of screws, lifting out charging cord is supplied with the unit, wired up and ready-to-run. the receiver/servo block, and relocating having an automobile cigarette lighter Actual conversion takes only around it in the conversion chassis. plug on one end and a plug to fit the 20 minutes to a half-hour. One merely The only bit o f creative thinking re­ Continued on page 90

Speed control wiper arm must be adjusted for full sweep. Best that Auto Charger works off car battery, provides controlled discharge power batteries are discharged or disconnected for this operation! and charging of drive batteries. APRIL 1976 17 Oh for the life of a CD! Jim Clark wistfully twists the prop on his carefully staked down Sailplane . that he won't have time to fly.

the beer, of course!) is carefully remove the crimped tops on all three or any number you have decided on. Now bump the bottom of two o f three cans. p m m m Use a sponge or a conical tool (lubed with grease) to partly reverse the con­ cave ends. A small baseball bat would By JOHN POND also be handy to use. The concave effect should be enough to take valves. (See Figure 1) • Beer can compressed air motor tanks. you guys who have been ribbing the The other end o f the can should be Yep! It’s a fact and here’s the way to writer unmercifully for his penchant for rolled to expand about .006 inch so it make them, as promised in the last is­ beer, sit up and listen carefully. will slip over the next can. That second sue. Best part about it all is that the All credit for the beer can tanks can, by the way, can be left with a por­ tanks are made from the columnist’s should go to Bert Pond, who has pro­ tion of the curved bottom to allow an favorite beer, Coors, sometimes called moted compressed air flying since 1930 easy slideovcr fit. (Figure 2) “ Colorado Kool-Ade”. The impact ex­ (and is still doing it!). The first thing to Using a V-block, or some form of trusion aluminum cans are light! So, all do, according to Bertram (after drinking V-bar for alignment, all cans are now

Mike Beach won the 1975 Bowden event at England's Old Warden Whyzit little guys fly big airplanes? Five foot Lou Levine with his Aerodrome with Baby Cyke powered Bowden "Mouse." Slow flier. ten foot Valkyrie, Anderson Spitfire powered. 18 MODEL BUILDER epoxied together. We do not re­ commend five-minute epoxy, as the slower stuff is stronger. If you are wor­ ried about your joints, Bert actually used (in his Hrst tanks) fiberglass or car­ bon filament strips over the joints for about 3/4 of an inch, epoxied to the joint. Incidentally, the joints will also hold much better if you remove the paint from the beer cans at the point of attachment. The valves (one for pumping and the other to connect your engine) are instal­ led in the convex portion o f the “ bumped” ends (See Figure 1). A bear­ ing surface should be fitted against the inside o f the can. This should be done before all cans are expoxied together. A later system o f installing valves, used by Bert Pond, consists of installing small pipe fittings in the end o f the tank and then expoxying the valve proper in­ side o f the pipe fitting. Makes a little more safe blowout-proof end. Bert further reports the best cans to use are the long, 16 oz. versions. In tests the tanks have held 100 psi easily. Sur­ and Charlie Pottol, who developed the 1946 issue o f Model Airplane News for prisingly, the Glastonbury boys in the motor. There are unsubstantiated ru­ $18.00 (less coil and condenser), its slo­ area have only had to use 60 to 85 lbs. mors that Al Hovsepian, producer o f the gan was “ The 49 that goes like a sixty.” of air to get good flights. Best part of micro engine, had a few contributions They weren’t kidding! this project is the beer tanks are much to the design. For the technical minded, the Made- lighter (1/3) than the standard brass In any respect, the Madewell 49 was well 49 featured a bore of .891, and ones. Matter of fact, the Massachussetts a real fine running engine. Matter of stroke of .783, to give a displacement of boys have been flying their models in­ fact, its lightness and power attracted a .49. With tank, the motor weighed nine doors with these ultra-light tanks. considerable number of converts to this ounces. The crankcase and carburetor engine. Originally aimed at the control formed one aluminum alloy casting, Of course, the old Professor, Bert with the back plate screwed in and Pond, has a few words o f admonishment line market in the postwar boom years, this engine has turned out to be one of forming part o f the formed steel tank. regarding safety. When first testing your The cylinder and cooling fins were completed tank, and before pumping the top free flight engines in its class any pressure into it, place it inside a size. First advertised in the November machined from alloy steel bar stock, burlap sack and pump wk.i your back to the sack. You might be propelled somewhat, but you won’t suffer any real harm! Recommended tank size is three 16 oz. aluminum beer cans that will give you a length of 19 inches. As you gain experience, you can make them as long or as short as you want! ENGINE OF THE MONTH This month’s engine, the Madewell 49, was a real puzzler for positive infor­ mation regarding its design and source. Worst part about the writer’s dilemna was that he lived in San Francisco while the motor was being produced across the bay in Oakland. When one first sees a Madewell 49, one is immediately impressed with the Drawn by TEX NEWMAN idea that this engine is a scaled up ver­ sion o f the late square-port Vivell 35. Small wonder as Jack Keener, designer of the Comet 35, (the size o f the Vivell 35 series) was one of the team that helped evolve the Madewell motor. As a side note on Jack Keener, al­ though he designed the original small Madewell engine, the Madewell 14 was the brainchild o f Harry Congable, owner of Irrigation Pipe Co., who dabbled with the engine business as sort of a hobby. Mr. Hurd, proprietor of Electro- Spray Co., financed the team of Jim Brown, Jack Keener, Harry Sharman,

APRIL 1976 19 T y p ic a l c o n n e c tio n

from all glue surfaces)

For owners o f Madewell motors, parts are readily available from Karl Carlson, 14600 Ramstead Drive, San Jose, Ca. 95127. In talks with Carl, he L - W | V u v - | regrets that the Super Cyke parts are ■r slow in coming, but in the case of the I A Madewell, no problems. So power up that Playboy senior of yours, it does make a nice flying free flight combina­ tion! FLORIDA SUNSHINE Terry Remert and Gil Cochran report that the KOI meet (King Orange Inter­ national) again featured old timer events. The writer is tickled pink to find Ron Sharpton’s Foo 2-U-2 (Nov. ’75 MB) winning .020 Replica in the cap­ Various compressed air engines by Fred Collings, Pittsburgh, Pa. (I to r): half-size 3 cylinder able hands of Gil Cochran. Guess who .060, production "Aero-W hirl" .14 cu. in., early 1900's Landis, and prototype "Aero-W hirl." was second . . who else, Sharp ton! with the bypass and exhaust stack bra­ turing this size plug. Bryton Barron never seems to wear zed on. Piston was Mehanite with a In reading a test report of the en­ out. Just like old wine, he gets better. tubular steel wrist pin provided with gine’s running ability, the same trap was This time he took all Ignition event with bronze end-pads. As with so many en­ fallen into again, as nothing but .60 size his very reliable Super Cyke powered gines of that era, the crankshaft was 14 and 12 inch dia., 6 inch propellers Playboy. Of course, Sharpton was sec­ ground from one piece of steel, and the were used to check the r.p.m. The ond with his (what, again!) full size co n n e ctin g rod was die-cast from writer favors an eleven inch propeller, F00. Those things go! aluminum alloy with bronze bearings. which turns up excellently. Do not ex­ The rubber event should be re-named V-2 spark plugs were popular then, and ceed six inch pitch, as this motor loves the Perryman event, as old “ Gorgeous the Madewell was no exception in fea­ to turn up. Gawge” did it again, winning handily with his California Champ. Not satisfied with that, he cleaned the boys in Un­ limited Rubber, using his old time Lan- zo Stick (Nov. ’74 MB). The guy is un­ canny! He lost his Lanzo Stick, organ­ ized a search party, and trampled half the woods down to find it. John Walters took second in rubber with a Golly wock, and that irrepressible Ron Sharpton nosed in for third with a Korda “ Dethermalizer”. Terry flew a Scientific Gold Star and managed a fourth, a no mean feat with that small model. Good time was had by all! VAMPS The (Las) Vegas Antique Model Plane Society is really starting to get o ff the ground these days. Received their latest output, VAMPS newsletter, “ Short Circuits” wherein they spell out most o f the 1976 Activity. Great stuff! As noted on their calendar, most o f the contests are scehduled to be held at the El Dorado Dry Lake, roughly 35 miles east of Las Vegas, o ff Hwy 95. Cliff Schaible puts alloted fuel in Jack Van Dusen's Red Zephyr for Texaco event at SPOT Annual . This event is catching on back east. Their biggest O/T meet, held in conjun- 20 MODEL BUILDER etion with the SCAMPS, is scheduled for Sept. 11 and 12. This is always a goodie, so make your reservations early. For more info, contact Editor Larry Vance, at 5066 Cindy Way, Las Vegas, Nevada 89102. You can’t miss this fun! SCIENTIFIC HORNET CONTEST? Hard on the heels o f the report on the Jimmy Allen contest, the writer re­ ceived an order for a flock of Scientific Hornet plans from Stan Fink. Stan re­ ports he hopes to stage a local contest and then challenge the KC Missouri boys to a postal contest featuring this design. If you are interested in participating in this model rubber powered contest, write to Stan Fink, 80 Crest Drive, Eu­ gene, Oregon 97405. Details should be firmed up now. O/T GAS TANK REPRODUCTIONS Been looking for a gas tank to match that old time ignition motor you just dug up? Well, no sweat, as Fred Collins has expanded his “ Custom Repro" gas tanks to 24 different types, varying from Brown Jr., to Denny mite, to James. You’ll be surprised at his latest list! The tanks are furnished with filler cap and full supply tube as required. loops on takeoff. He never did get an­ For further info, write to Fred Collins, went into a deep coma for two months. other flight in! 29 Steward Avenue, Pittsburgh, Pa. Never did regain consciousness. Just re­ Finally conceding, Jim offered his 15227. ceived the information that Ed has now vive bucks to Bud, but McNorgan re­ NO GUTS gone to that free flighter’s paradise fused, saying he never took a forfeit yet. Last month, we reported on the chal­ where you get “ max” flights all the The latest development after this rather lenge contest called "They went thata- time. Gonna miss that stove pipe hat at inauspicous beginning, is that McNorgan way” , a strictly “ guts” contest for let­ the Nationals Old Timer Events, that's is now attempting to create a suitable ting a model go full bore with all the gas for sure! trophy with a compartment for storing you care to put aboard. the five dollar challenge fee. Upon win­ HAGGART-BOWDEN PRECISION The writer had hoped to have a good EVENT ning the trophy, the victor can then report, but according to Jim Dean, Edi­ empty the money compartment and Some columns ago we mentioned tor of the SCAMPS “ Hot Leads" news­ buy a round of beer all around. The last that John Haggart (before his untimely letter only two showed up to put a fin idea, is mine, haw! death) was organizing a contest on the (five dollars) under the rock; Jim, and order of the old Bowden Event that Bud McNorgan. AND THEN THERE WERE NINE LIT­ Hamilton Fish won in 1937 (with Carrol After some preliminary fiddling with TLE INDIANS Krupp’s design) when visiting England his model, Bud put his Torpedo Special Ouch! Lost another one! This time with the USA Wakefield team. powered Long Cabin model (Feb. ’76 it’s that fun fellow, Ed Franklin, of New According to Peter Fisher of Perfor­ MB) up for a flight of six minutes with a Jersey, a stickout member of the Thun- mance Models, this event was actually 2:40 engine run. Jim, employing his derbirds for years. Imagine walking by staged last August at the Shuttleworth faithful Riser Rider, managed an at­ the power room in the telephone build­ Collection Aerodrome. Because of the tempt (less than four minutes). There­ ing and all of a sudden .. BOOM! An small field, the rules as originally pro­ after, Jim attempted to establish a new unaccountable explosion. mulgated, suited the area. Basically, the Guiness record for consecutive ground On taking Ed to the hospital, he Continued on page 76

Jack Knapp's first O.T. model is this Berkeley Brigadier with John Targos sent photo showing Bill Seidler's gull wing design plus Ohlsson 23. Excellent way to start . several Standard Bucs at 1939 Long Island meet. Identities anyone? APRIL 1976 21 22 FULL SIZE PLANS AVAILABLE - SEE PAGE 94 MODEL BUILDER monstrated to aero engineers, its steep altitude-grabbing climb was not too im­ pressive., a too-light unrealistic air­ plane! O f course, today, the F-15 reaches 39,000 feet in 59 seconds from a standing start. Now it ’s real! Away from history and humor. The "Cabruler” is along the constructional lines o f most o f my ships o f this period. The fuselage is erected on a basic " c r u tc h ” frame, and finished free­ handed o ff the plan. Wing features the NACA 6409 section, with sheet balsa top leading edge to maintain the airfoil shape to the high point, and to stiffen the wing against bending. The motor mount assembly is re­ movable from the fuselage for inspec­ Henry Struck's chaser for the "Cabruler" was R ikitikitavi, long gone since this July 1940 tion and clean up, and now provides an photo was taken. Other than photo in Jan. 1940 Flying Aces, design was never published. obvious way to add simple R.C. gear for directed free flight. The actuator can be left in the airplane for free flight, or re­ moved through an access panel in the STRUCK’S CABRULER” fuselage. Here's a model that will even make hardened old timers do a double- The original was covered with white silk on the fuselage, and red cross- take. Never previously published, it's a Class A cabin version of the grained double tissue on the wing and famous New Ruler by its equally famous designer, HANK STRUCK. stab. If Monokote is to be used, dia­ • Based upon the proportions of the either. Nor was there any more than 5c gonals should be fitted between the New Ruler, this Class A cabin was built in the engine seeker’s pocket. Now it spars, and between the leading edge and to enjoy the advantages of the sensa­ came down to the feet to get the pilgrim the lower spar, to box in the leading tional new Bantam 19 engine. The Ban­ to where 5c would get him back to his edge and increase torsional rigidity. tam was developed by Ben Shereshaw, far-away work bench. This was accom­ The ship was adjusted for a right creator o f many beautiful aircraft of the plished eight miles later, after crossing climbing pattern, with right glide. This early days o f gas modeling. The Class A the George Washington Bridge back into requires some slight left thrust shims category of up to .20 cu. in. had just Manhattan. Another subway ride and between the motor mount and the fire­ been established, chiefly due to the re­ the end o f a great day, and the inspiring wall. Glide circle was controlled by the markable performance of Ray Arden’s memory of a trek across those empty rudder tab setting. A further develop­ Atom engine. Jersey meadows. ment of this design, the Connecticut To actually get one o f these new One day, however, Serial No. 294 ar­ Yankee, flew well in right climb and left “ Benny’s Beauties” was not easy. In rived by mail! And it was all worth­ glide. Using stabilizer tilt, unknown to fact it took about a year. Ben was build­ while, because it was in a class by itself. me at the time, will no doubt help ob­ ing these first engines at his home in Today, several airplanes and many years tain either flight pattern, if you can Nutley, N.J.. One day, a word-of-mouth later, it still runs, though its magnesium stand crooked airplanes. . but they ad­ message reached me that one was ready. crankcase is darkened, plastic tank dis­ mittedly are better than cracked air­ So early in the morning, onto the sub­ solved, needle valve replaced, and slight planes. way in Jackson Heights, L.I., to the play has developed in its journals.. a For R/C flying, the glide should be Hudson tubes and under the river to treasure. trimmed just a little faster than free Newark, N.J.. There to the Bamberger After emigrating to Connecticut to flight, as much rudder action as possible store, sponsor of the famous Bamberger work in the Ludington/Griswold Smoke should be employed, in order to roll Aero Club, in which Ben was a leading tunnel as a model maker and smoke gen­ rapidly from one circling direction to light.. But he was in Nutley, they said, erator, evenings were put to building a the opposite without stalling in the and so onto a bus.. but he wasn't there model for the new Bantam. When de­ cross over. ·

With a little imagination, the famous New Ruler lines can be discov- Typical of the period, the ignition tray came out with the engine, ered in this cabin version. The cowling just never made it. Timer arm stuck through bottom of fuselage. Looka that Bantam! APRIL 1976 23 Charlie Gilbert's experimental electric powered chopper gets up a head of silent, smokeless "steam." Power-to-weight ratio is still on the weak side. Chopper w ill lift off and "sw im " around, but does not quite fly. Success is not far away now!

long to realize he had been serious about “electric-power” so I hurried over to see what he had come up with. As the pictures will show, he had completed about 80% of the chopper and was getting ready to build the main and tail-rotor blades. We turned it on a few times and played with the controls to see if we could find any glitches in his design philosophy. There being none at the moment, I took my pictures and went home to wonder about its chances for flight. Charlie, CHARLIE'S ELECTRIC CHOPPER his lid, and passed it over with little being an experimenter from way back, • Would you believe an electric more than a shrug of my shoulders. As had become intrigued with electric flight powered helicopter with collective pitch the weeks rolled by I didn’t give it several months ago when he saw an R/C and all that good-stuff? When my another thought, until one night a airplane fly with an Astro Flight, Inc. friend and flyin-buddy, Charlie Gilbert, couple of weeks ago when he called me electric motor. Being a design engineer told me he had one on the drawing and said bring over the camera, he had and machinist by profession, it wasn’t board, I thought maybe he had flipped something to show me. It didn’t take very long before he envisioned an electric chopper and started to get it all together in his head before starting construction. Without a doubt, there are several other modelers working on this idea and someday you’ll see these little birds buzzing around the local flying field. They should have great appeal since they are very quiet and clean . . . no fuel, no messy exhaust, just a battery charger and a radio is all that will be required! We do hope that the data presented in this article w ill prove of value to those experimenters who are also constructing silent-flight choppers. O f necessity, all components would have to be selected carefully for weight considerations. Charlie calculated the performance would be optimized by selecting the Astro Flight 15 motor, 1 /6th horsepower, which is driven by a

Charlie and his "electric flying machine." Note bamboo landing gear struts. Hmmm . .. how 24 volt power-pack weighing 1 pound. about a power converter and a long extension cord!? A simple box fuselage was constructed 24 MODEL BUILDER Method of mounting electric engine. Cooling fan below engine. Another Gilbert experiment. This is an entirely scratch-built four- Battery tray in bottom of fuselage. bladed rotor system. Not yet flown. Just give him time! out of spruce longerons covered with to provide a gear reduction o f 5:1 from thickness. This has proven to be birch (wing skin) plywood. Lightening motor to main rotor. The motor RPM extremely rigid and strong. Not wanting holes were cut out wherever possible, was shown in the specs to be around to take any chances on tail rotor vibra­ and the entire shell was later covered 10.000 RPM with an 8x4 prop . . . the tion, Charlie added braces made from with white monocote for strength. The reduction gears would then drive the lightweight bamboo strips. I think his motor itself was strapped into place in main rotors at something less than wife, Lorraine, had something to do a “ v " block arrangement so it could be 2.000 RPM. Special bevel gears were with the extensive use of bamboo on easily slid up or down to properly also selected to drive the tail rotor at a this model, since she is an ardent mesh the gears. The battery pack, ratio of 4:1 with respect to the main handicrafter herself and has quite a easily the largest and heaviest piece of rotor, somewhere in the vicinity of supply of rods, strips, etc. on her own equipment on the entire model, was 7.000 to 8,000 RPM. workbench (at least she had a good placed on the floor between two rails The tail boom was cut from an supply). The landing gear struts and . . . this permits an easy adjustment of aircraft “ dip-stick” (used to measure fuel skids were also formed from bamboo center of gravity should it be required. in the tanks) made from fiberglass about and steamed into the desired shape. Special plastic gears were ordered 1/2 inch in diameter with .020 wall Continued on page 86

Electric motor is mounted in "V " wedge, driving main rotor bevel Underside shot shows Delrin main rotor hub, rotor blade attach gear. Note tail rotor drive take-off. bracket, and pitch control arm. APRIL 1976 25 wrote a rebuttal, Ralph (still another ficticious name) wrote another protest about Tom’s landing. The Contest Di­ rector wrote home to mother. . .(naw, I ’m only kidding). After the dust had settled, the Contest Director denied the protests and let Tom keep his landing points. When everyone got back home, the phone lines started buzzing, and the typ ew riters started clattering away. Everyone got hot on my boss’s case. (Remember him? W.C. Northrop . . R/C Contest Board Chairman . . ) Jerry and Ralph were appealing the contest direc­ tors denial of their appeal. Mr. Northrop check the rule book and found that there is nothing in either the R/C Sail­ plane rules or the General Sanctioned Competition rules that would permit Tom’s broken-stabilizer-landing points to be taken away from him. Since Photo of canopy latch system sketched on next page and developed by Bob Mickelsen, of Tom ’s airplane did not land in an inver­ Clovis, New Mexico. Neat and positive. ted position, did not shed any non-jetti- sonable parts (by the way, would some­ one care to tell me what parts are jet- tisonable? Is water ballast considered a part?), and since nothing in the pre­ R/c S O A R IN G w contest information indicated that the • When I first inherited this column The soaring portion of the contest standards for spot landing would be any from Le Gray, I stated that it was not was littered with a flurry o f protests, different than indicated in the AMA going to become a battleground for counter protests, appeals, complaints, rule book, Mr. Northrop ruled to sup­ rules changes. That declaration still and general griping from all sides. The port the contest director. holds true, but in light of a situation furor centered around one spot landing OK .. so much for what happened. that I witnessed (at least partially), I made by one contestant (who, to pro­ Now comes my question .. Are landings feel that it is time to make a point or tect the innocent, I ’ll call Tom). Tom in which the airplane is rendered unfly- two about the AMA Soaring rules. made his spot landing, and the nose of able really landings, or are they better The incident in question took place the plane stopped very near the center called arrivals (or crashes)? Somehow I at the 26th annual Southwestern Re­ o f the circle. Unfortunately, during the find it difficult to believe that the intent gional Model Airplane Championships. landing the left stabilizer o f the plane of a spot landing task is to bury the This contest, incidentally, has had an broke (but did not separate from the nose of the glider in a given spot of R/C soaring event for only four years, fuselage). Jerry (another ficticious name earth, regardless o f the outcome to the but the contestant support has grown for a real person) cried, "Foul! He rest of the airframe. from only eleven fliers four years ago, shouldn’t get points for that landing. What are the alternatives? Some say to over seventy this year. The contest is His stab broke .. he couldn't fly the that we should have judges to evaluate held annually at an abandoned World plane again in that condition!” . the landing and determine what is a War II airbase near the Arizona farming A t this point, the Contest Director landing and what is a crash. The pro­ community o f Buckeye, 40 miles west was pulled into the fracas. He agreed blem with judges is that you have to o f Phoenix. It is unique in that free with Jerry that the plane wasn’t flyable, have judges.. .people to make decisions flight, control-line, and R/C soaring but gave the landing points to Tom any­ which are subject to protest. I person­ events are going on simultaneously way. Now the pencils and paper were ally am in favor of maximizing flying along the length of one gravel runway. smoking. Jerry wrote a p ro te st.. Tom and competition enjoyment and mini­ mizing the controversy. (So far, not so good, wen) I've already had a class in debating .. and have no desire for a con­ tinual refresher course. Cast my vote against landings being judged. Another notion that keeps popping up would require the pilot to fly under a string that is set up at a given height, and at a given distance from the landing spot. OK fine .. Now how do we set up the string so that the average guy (like me ’frinstance) can get under it, yet still have it low enough to control the ap­ proach angle o f the glider. And what do you do when the wind direction, and velocity, keeps changing? I can just see the landing circle ringed with sticks and strings. In Viet Nam, I think they called the same thing a Punji trap!

Spoiler mechanism, also by Bob Mickelsen, uses rubber band tension to hold spoiler open, Still another idea calls for a sort of rather than the usual reverse. Servo pulls it down. Spoiler material is counter-top Formica. claiming system for landings. If a con- 26 MODEL BUILDER testant feels that another guy has made a plane that gets it wings misaligned should be, the longer we are going to a crash instead of a landing, he can de­ under the rubber bands, or one that have angry people being denied or given mand that the plane in question be im­ loses rubber bands. (Easy. None of these landing points that they may or may pounded and flown in the next round are repairs.. structural repairs, that is. not deserve. without any repairs. Make no doubt wen) Another problem . . What about Incidentally, "je rry ” , in the case about it.. that will make the pilot in one plane being hit and damaged by an­ cited above, based his protest on an un­ question either put up or shut up (or other in the landing circle? written rule that if the plane is not fly- sweep up the remains in a basket!). The I'm sure that there are probably a able it should not receive spot landing problem with this system is, what do dozen more good solutions to this prob­ points. Well, jerry old buddy, i t ’s high you do about a Cirrus that rolls its lem. My point is th is .. The longer we time that we get that rule, or some sub­ wings forward, or what do you do about put off defining what a spot landing stitute fo r it, in writing. The deadline for rules change proposals is June 1, 1976 (or maybe September, wen) As you read this, that is no more than 60 days away (or maybe . .) and probably less. If your proposal is not in to AMA by that date, you cannot possibly see a rules change in effect before January 1, 1980!! I would like very much to hear from you about this, or any other rule that you would like to see changed. Possibly I can put you in touch with other people who share your ideas, who have tried your ideas on a local level, or who would like to have your suggestions. If nothing else, I’d like to know that you at least read this, and disagree comple­ tely with me. If you’ve taken the time to call me a dirty name, at least you’re thinking about me! I did come back from Buckeye with something besides tears and heartache. I managed to steal two nifty ideas from Bob Mickelsen of Clovis, New Mexico. Bob was flying a Multiplex Alpha (which is a darned good, though not often seen standard class sailplane). One idea was Bob’s spoiler system. Everybody uses rubber bands to hold spoilers closed .. right? Well, Bob uses them to hold them open. The drawing shows how he does it. Light braided fishing line is used to haul the spoilers shut, and a small rubber band, hooked to a simple wire actuating arm, pulls them open. The rubber band has proved to be plenty strong to open the spoilers (remember, there is a vacuum on top of the wing .. that is what keeps der flying machinen in der a ir., so not much force is required to open the spoilers.) The servo pulls them shut very posi­ tively, eliminating the usual problem of having one spoiler not quite shut and the other hanging half open. For the spoiler blades themselves, Bob uses Formica (that’s right, counter- top material). The undecorated side can be sanded smooth and covered with Continued on page 91

ASPECT PLACE NAME COUNTRY SPAN WEIGHT AIRFOIL LOADING DIHEDRAL AILERONS AIRBRAKES BALLAST RATIO 1 Trondle □ 118 3.4 lbs. E-174 7.2 oz. 7° No Yes 400 g. 14:1 3 Schiborr D 100 3.1 E-374 8.8 2° Yes No 650 g. 13:1 5 Noss 0 130 4.2 Eiffel 9.5 2° Yes Yes Yes 7 - 400 (mod.) 6 Dallimer GB 127 3.5 Clark Y 7.6 Poly No No Lots 17:1 9 Bannister GB 127 3.6 Orig. 10% 9.5 2° Yes Flaps Yes 20:1 10 Stunz D 110 3.8 Orig. 6.9 2° No No 500 g. ? 13 Keim N 115 3.3 E-387 7.9 6° No No 280 g. 14:1 14 Scholz D 118 3.3 E-174 7.3 7° No Yes 500 g. 14:1 17 Lohmann D 145 5.3 Orig. 10.1 Yes No 300 g. 18:1 2o 18 Allner D 115 4.4 Go 795 I 12.6 2° Yes Yes Yes 16:1

APRIL 1976 27 CURTISS A-8 SHRIKE

28 Full size prints of the Shrike series are available from Peter Westburg at S7.50 per set. See ad on page 81 MODEL BUILDER While at Barksdale Field, Louisiana, the 13th Attach Squadron A-8 Shrikes were devoid of all markings except aircraft number on fins. Note Curtiss Falcon (Jan. and Feb. 1976 MB) in background. CURTISS A-8 “SHRIKE” M — G ALL PHOTOS COURTESY OF PETE BOWERS • During its long career, the A-8 ap­ peared in many different markings. It began service with the 3rd Attack Group, comprised of the 8th, 13th and 90th Attack Squadrons, the only attack squadrons in the A ir Corps, at Fort Crockett, Texas, which also flew A-3B Falcons. Early in 1935, the group was transferred to Barksdale Field, Louisi­ ana, where it was soon outfitted with the new A-12’s. Nine surviving A-8’s then went to the 37th Attack Squadron at Langley Field, Virginia, and of the five survivors from that squadron, two went to Chanute Field, Illinois, and the remaining three went to the Command and General Staff College at Fort Leav­ enworth, Kansas. The XA-8 prototype also went the route of Fort Crockett, Langley and Chanute where it was fin ­ ally scrapped with 878 hours to its credit. The YA-10 served honorably in the air mail crisis of 1934, went to Fort Leavenworth and was scrapped at Cha­ The geared version of the Conquerer, in this A-8A, had reached its peak at 675 hp. Forty-six nute with 2119 hours in its log. subsequent Shrikes were powered with the 690 hp Wright Cyclone radial.

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The Shrike was the A ir Corps' first all-metal airplane. Fixed rear canopy on this prototype XA-8 was a tight squeeze for the gunner. Looks like you'd have to put on your parachute AFTER you bail out! APRIL 1976 SHEET 3 oi3

30 Full size prints o f the Shrike series are available from Peter Westburg at S7.50 per set. See ad on page 81 MODEL BUILDER The 600 hp Conguerer was famous for running hot, and additional oil cooling was had by making the ten gallon tank flush with the fuselage contour and adding an air scoop. Note how much more advanced the airplane looks compared to the cars.

The Navy was also interested in the rective required that all new and refin­ checkerboard discs on the wheel fair­ Shrike, though not as an operational air­ ished aircraft have the olive drab re­ ing, and a similar diamond pattern on craft. It was interesting in the fancy new placed by blue, and some Shrikes were the spinner. wing, and bought a Shrike with a 625 hp finished in this color. The three A-8’s To some, the A-8 was an ugly air­ Wright Cyclone, calling it the XS2C-1. at Fort Leavenworth had the pylon and plane with a mean, pugnacious look, but Originally the color scheme of the fairing modified and faired into the rear to this writer, it had the classically A-8 was the standard olive drab and yel­ cockpit, and they had the VA-10 had beautiful lines o f a fighting airplane low, but a July 10, 1934 A ir Corps di­ blue fuselages and red and yellow tough enough to take on any opponent. USAF MUSEUM PHOTO

Late in service life, the pylon and rear canopy were modified. This one at Command and The 13th Attack Squadron at Fort Crockett, General Staff College, Fort Leavenworth, Kansas. Texas, with black-trimmed white blazes.

Completely equipped test pilot, with clipboard on leg, ready to test the YA-8A at Wright Field. Geared engine and other mods added 500 pounds over weight of A-8. Nose of this lone geared Conquerer was smoother than regular model. APRIL 1976 31 • Okay, so I ’m on the defensive. Model you sailplane types. We can offer you rocketry has always been considered a the power, in a reliable, cheap package, “ kid’s hobby” . . . a concept supported and a wide range of impulse and thrust by the larger manufacturers. Rockets duration. I recently watched a home- are sim ple, compared with model built sailplane, powered by an F7-6 planes; just about any thrown-together rocket engine made by Flight Systems, model can make a flight, at least. This Inc. The engine carried the bird to makes it attractive to young, impatient about 1500 feet during its nine-second types, like the author ten years ago. But thrust duration. The parachute ejection there’s more to it than toys, as I ’m still charge built into the engine released the learning after better than fifteen years power pod, the chute blossomed some of playing with the fool things. feet to the rear, and the bird levelled I’m quite willing to grant superiority out to spend many minutes free flight to the guy with the full-house RC that soaring on the available lift. The whole took him three months to bring to flight thing was my idea o f poetry in motion. status.. all I ask is that he show a bit of This idea was designed for the con­ interest, or even respect, for my 8- version of a Jetco Thermic 18 Hand- month old scale Scout B, or my at­ launch glider, but the basic design can tempts to wring a sonic boom out o f 80 be adapted to just about any glider de­ newton-seconds o f total impulse. sign. If the glider is trimmed for a circu­ I hope that this doesn’t sound too lar flight, with a slightly tipped stab or hostile. I have tremendous respect for little trim weight on the underside of all modeling hobbies; I just tend to feel one wing, you can get a really beautiful a bit browbeaten after a while. Model flight with it. The power pod shown is rocketry owes model aviation a lo t .. . designed for FSI engines, because most our basic construction techniques all o f them feature long, slow thrust; per­ come from it. We pay back the debt a fect for gliders. High thrust engines can little by attracting those 8 to 12 year- reach that magic constant, the “ speed of olds, and often passing them on model balsa,” and fill the air with a cloud of aviation; for there are many areas where little pieces. You can get a catalog of A LOOK AT our hobbies blur into each other. The FSI products from Flight Systems, Inc., construction idea that I submit for your 9300 East 68th St, Raytown, MO consideration with this article is a prime 64133. Especiall recommended are the MODEL example of this; it is also something that D4, D6, D18, and E5 engines; they will may persuade you experienced types to all fit this pod. give rockets a try. This interesting hy­ The pod itself can be built from ROCKETRY brid is called a “ boost-glider,” since it either Centuri or FSI parts. More hobby By DOUGLAS PRATT . . . must be capable o f two modes of flight; stores carry Centuri, so I have included No more or less of a toy than mod­ a straight boost under rocket power, their parts numbers on the drawing. The el airplanes, model rocketry cont­ and a stable transition into a glide. Con­ launch lug runs along the top of the inues to grow in popularity and sider it for a moment, folks; especially Continued on page 86 stature. The FAI conducts world competition. Let's investigate.

P AR TS LIS T

1. HRT-808 (FSI) or ST-8 (Centuri) body tube 2. TR-1 Thrust ring 3. Launch lug (1/8") 4. Screw eye 5. Shock cord 6. HNC-81 (FSI) or BNC-8 (Centuri) nose cone 7. Balsa fo r p y lo n (same thickness as fuselage) 8. 1/8" Plywood for alignment plates Two photos showing the power pod mounted and removed from the hand-launched-glider fuselage. Most any glider can be used . .. just move the fin to the bottom !

32 MODEL BUILDER THE profile Guardian By BILL MELTON . . . The Guardian has been a long-lasting favorite in Navy Carrier, and if contest results are any indication, the profile version could continue to dominate in that class. • When the profile carrier event first loaded with all sorts of moveable sur­ Since that time, there have been started, everyone was quite happy with faces, automatic adjusting-line sweep and 25 to 30 copies of this plane built in the relaxation of rules on the design all other features I could think of. The the area. It has been a winner in almost of the planes. A common statement plane was an immediate success and all area contests. High speed is generally was, “ Now we can see something other lowered our low speed times by 3 to 4 in the 75 to 80 miles-per-hour bracket than Guardians” . I was also kind o f tired miles-per-hour. However, over a period (or as fast as your engine will run), of Guardians, and started a series of of time, the flaps were glued up, rudder with low speeds around 18 miles per planes based on the Airobonita. Three movement was limited, the inboard hour. Our record official low speed was or four of these were built and none of aileron was fixed, and the automatic 14 miles-per-hour by Fred Malone, of them were really successful. line sweep mechanism converted to Albuquerque. Fred also missed the About this time, I realized that there simply an adjustable line sweep as deck on this flight. This is really not were no profile Guardians flying in the usually encountered on stunt planes. too bad when you figure we are flying area, and so in order to do something A few other changes were made in at elevations of 4000 feet and up. The "really different” , I designed my first moments and airfoils but the basic final compliment for the design occurred profile Guardian. The original was really design was unchanged. at our July, 1975 contest, when all

The Guardian is simple, uncluttered, and very competitive. The profile Guardian fleet. They all look the same, but no two are alike. APRIL 1976 33 34 FULL SIZE PLANS AVAILABLE - SEE PAGE 94 MODEL BUILDER Arresting hook and release mechanism. Rudder deflection release Another view of arresting hook mechanism. Instructions in text gimmick also shown. give all details.

profile carrier entries were this profile am sure the entire plane could be built off, allowing about an 1/8 inch margin Guardian. I think I should start hunting in less than a week, if required. The behind the ribs. The spar between the a new design. flat-bottom airfoil really simplifies this center ribs is removed and the 3/32 Construction is really simple, and I part o f the construction. The first plywood bellcrank mount epoxied in requirement is for a warp-free building place. The top spar can now be added. board. Care should be taken at this point to The building sequence of the wing is make sure the wing is still flat on the as follows: The leading edge planking is building board. The spar for the aileron pinned to the board. The spar is glued should be installed at this point, as well along the edge. The leading edge is as the control horn for the aileron. Make glued on the leading edge o f the planking sure the bearings for the control horn with a 1/2 inch sweepback. While this are well epoxied to the supporting ribs. assembly is drying, the ribs can be cut The trailing edge planking can now be out. The tip and root ribs are traced cut to shape and glued in place. onto 3/32 plywood and cut out to serve The wing is removed from the build­ as templates. Balsa rib blanks are sand­ ing board, the excess leading edge plank­ wiched between these templates, bolted ing trimmed off, and the leading edge together . . . and with a little carving carved to conform to the curvature of and sanding you have a set of ribs. the airfoil. I generally install the The trailing edge planking is then J-Roberts bellcrank, complete with lead- pinned down parallel to the leading outs and stub pushrods, at this point. edge, and with the proper spacing Care should be taken to get the bends in between leading and trailing edges. The the throttle pushrod correct and to Engine and tank installation. ribs are notched for the spar and glued make sure it does not bind in the slot in place. The trailing edge is trimmed cut in the bellcrank platform. It is then a simple matter to plank the leading edge, the center section, and add the capstrips. The aileron is carved to shape from solid I/2 inch balsa and installed with nylon hinges of the pinned type. Epoxy- lite putty is used to put in all hinges and control horns. Care should be taken to insure that the pivot point of the hinges is in line with the pivot point of the control horns. The tips are cut to outline and glued on. These should be made from very soft balsa. If the adjustable leadouts are desired, the inboard tip rib mecha­ nisms should have been installed during the wing construction. The inboard tip must be hollowed to clear this mecha­ nism. The leadout position shown is about right for 90 percent of the flying, but it is nice to have the option of adjusting the leadouts for different planes and for different flying condi­ tions. If the details o f the adjustable Let’s fly carrier! Here we have a Guardian for each class. They're a tough airplane to beat in this event. Continued on page 64 APRIL 1976 35 Arlie Preszler and his Sig P-51 that has been described in detail in this and an earlier issue of MB. Plane is gold (bronze powder in clear K&B Superpoxyl with black and white trim . Power is a Veco .19. Preszler photo.

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By "DIRTY DAN" RUTHERFORD ontrol line PHOTOS BY THE AUTHOR

• In last month’s column, I suggested and clevis sets) and assorted Du-Bro the horn will give too much control and that you go to your favorite hobby shop items. The other set-up, with the white the next hole up won’t give enough. The and pick up on several items that make nylon base, is an item from Royal Pro­ set-up shown eliminates this problem a neato control horn (control bolt?) as­ ducts. It works OK, but I’m not sure if and allows you to really get a plane sembly. If you were unable to figure out it is available. "dialcd-in” just like you want it. With what to do with all those little pieces, a We already have adjustable control the assembly made from Rocket City couple of the pics with this month’s co­ horns, so you may wonder why I feel and Du-Bro parts, there are 13 more set­ lumn should help out some. The picture like going to the trouble of making my tings available to you in the gap be­ showing a 4-40 bolt running through ply own. That’s easy to answer.. None of tween the holes on a normal control doublers on the elevator is made up the existing control horns have a real horn. with Rocket City No. 69 (2 ea. of swivel tight range of adjustment. One hole on I first felt the need for this type of

The strong arm of big John Ballard after a 5:58 in Goodyear at the The "Warsaw W arrior," Bart Klapinski, static judging at the Nats. KOI. He has rep for undetectable whipping. Who'll argue! Rush photo. Checking for smooth filleting. Picky, picky! Rush photo. 36 MODEL BUILDER horn when we started putting together some really good .049 Combat planes. These planes are very touchy and have to be right on, or you are going to unin­ tentionally stall them out in a tight match. Also, our .049 planes really tighten up the loops when flown down­ wind in a mild wind. For days like this, I crank in some more control and go nuts doing itsy-bittsy loops right next to the ground. Anyway, I have been using the control horn set-up shown on all of my Combat planes and have yet to have a failure of the clevis, the bolt, or any­ thing else. However, I do recommend that the bolt go through 1/32 ply dou­ blers on the top and bottom o f the ele­ vator, to keep the bolt from tearing out of the elevator. Bart's at it again. This tim e he's checking the height of the numbers on Phil Granderson's Slow A Du-Bro Swiv-Link (Stock No. 113) Combat ship. Phil bought the pavement with it later. End of Cinderella story. Rush photo. can also be used to make a trick control horn, but the clevis is kind of brittle and by a little o l’ .15, and is a very dirty able to get started on publishing some you have to be very careful with it when airplane when compared to a Rat. worthwhile material in the next couple making adjustments. Other than that, it Here I am working on Project Good­ of months. As mentioned previously, works fine. year and hoping to run in the high 6 the first plane will be John Kilsdonk’s * * * min. bracket.. mid-6’s maybe.. and Falcon Spl. No. 10. This plane was first The Col. (Howard Rush) was in town Ballard whips o ff a high 5 min. run. (If drawn up by John in ’66 and was pub­ for a week or so recently and he laid the previous sentence was too subtle for lished in AAM in the Oct. ’68 issue. some good pictures on me. The one of you, go back over it again!) Kinda John was good enough to up-date his John Ballard, in this issue, is one of makes me feel like giving up Racing, original drawings for me (the plane has them. This was taken right after Ballard when somebody goes that fast in an to be beefed-up to withstand current had done 5:58 in “ Badyear” at the KOI. event where I have yet to go under 7:30 airspeeds and shut-off loads) and then That’s right, 5:58, Badyear Freaks! That for a Final! send along a set to build from. As AAM is really honkin’, especially when you Speaking of Project Goodyear, I am has gone away, the original plans o f the remember that a typical G/Y is powered still working on it, and we should be Continued on page 66

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Close-up of Royal Products control horn, as mentioned in text. Control horn made from Rocket City and DuBro parts. Mentioned in Works fine. Photo by Dirty Dan. text. D.D. uses this rig on all size combats. Allows fine trimming.

Two photos by D.D. showing his landing gear mounting method for Slow Combat. Reinforcing dowels in motor mounts also show well. Airplane is D irty’s as-yet-unnamed design. He'll call it something after he finds out how it flies . . . perhaps unprintable! APRIL 1976 37 MAKE PHOTOS BY THORNEY LEIBERMAN YOUR OWN FORMING TABLE By RON WILLIAMS ... At last! An easily-built vacuum former for odd cowls, canopies, wheel pants, and whatever. Change dimensions to suit your own requirements, but don't make it one inch too small!!

• One has but to read a few how-to part. The Mattel Toy Company manu­ held in the frame could be heated on articles on U/C or R/C scale (or semi­ factured a “ vacu-form" toy some years the hot plate, flipped over to the vacu­ scale) to realize how often the question ago which has become a valued tool for um table and pulled and formed over a of canopy, cowl or wheel-pants comes many free-flight scale modelers (see Bill small object by a hand-pumped vacuum. up; free-flight scale often requires light Hannan's column in the December 1975 It was quite well designed and works weight wheels and canopies as well. issue of MODEL BUILDER). This toy very efficiently. For builders o f larger What to make them o f .. a thin, light had a small hot plate next to a vacuum models, however, the Mattel unit has plastic shape; but how to get it? Articles chamber with a frame that hinged be­ limited capabilities due to its small often mentioned “vacu-forming" the tween the two. Small sheets of plastic table size (approx. 3 x 5 inches). Canopies and cowlings for a large stunt- er or R/C job require more “formi­ dable" equipment. There is also the growing problem of finding Mattel units in working condition. We will explore the process of vacu­ um-forming at home with the vacuum table described here. Look the draw­ ings over to see what’s what. Most canopies for larger models are about 12 to 14 inches long by 2 to 4 inches wide. SIG mail-orders 8-1/2 x 17 sheets of heat formable plastic (styrene, I think). These dimensions seemed reasonable for the development of a useful unit. Small­ er sheets of plastic can be handled by bringing them up to the larger size with the addition of heavy bond paper taped to the small sheet. I decided to start with our family Sailplane canopy, the plug it was formed on, and the crazy pilot it w ill cover. Plug is 2-1/2 by vacuum cleaner. It is a G.E. tank type of 2-1/2 by 8 inches. Plug carved to shape on model, and then material added for trimming. unknown vintage. I have seen similar 38 MODEL BUILDER WAMggy ^CAR HHCc g o ·· Plfcc-H (CAfrlNCT a^AP » ) r t y w c o p

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v e .StatMCPA PPAWN t H k c n w i i i a m s . MODEL BUILDER ------“ ^ 7 / 0 m agazine Plan No: 4 / 6 3 ______*_ machines for $30 in local repair shops, pin-vise is suggested for masochists. Glu­ and drill the holes. My table top had second hand of course. Your local repair ing is facilitated with an assortment of 578 holes; the Dremel Tool enabled me shop should also have an adapter tube clamps, but if they are not available, the to finish the drilling in 30 to 35 (Fig No. 1) which, though not entirely joints can be screwed as well as glued. minutes. I broke one drill in the process. neccessary, will facilitate' the attach­ Don’t leave the glue out, it acts as a Sand the top very carefully after drill­ ment of the cleaner hose to the vacuum vacuum seal. ing, smooth to 600 paper, and clear all table. Begin construction by cutting the the holes. Glue the outside frame of the The vacuum table was made with wood to size. Lay out the hole pattern box together, making sure the top and scraps of birch plywood and masonite on the table top (plywood or masonite) bottom surfaces o f the frame are flush found in the cabinet shop’s throw­ aways. Some straight clear pine is also IZ.ITC'H&'N $ncVe- required. The box sides were made with 3/4 inch birch ply, the top with 1/4 inch birch ply, the bottom with 1/4 inch masonite (tempered) and the frame members with 3/4 inch clear pine ripped to 7/8 o f an inch wide. Tite-bond glue was used, and the frame supports at­ tached with 10 No. 10 flat-head sheet metal screws, 1-1/2 inches long. Some 50 thumb-tacks are required (they hold the plastic film in place in the film frame). I used 1/8 O.D. surgical tubing (about 54 inches long) as a vacuum seal between the film frame and the support frame. Tools required are a few I/32 drills, a drill the size of the tack shafts, and one half-again as large. It’s nice to have more than one of the 1/32 drills, as they are likely to break what with all the holes to be drilled. A high-speed drill like the Typical kitchen set-up for vacuum forming. A foot-operated switch on vacuum cleaner comes Dremel Tool is a great time-saver; a in handy during operation!

APRIL 1976 39 Make the film frames from the rest of the 3/4 X 7/8 pine pieces. The frames should be able to be slipped snugly, easily... easily down over the table and onto the support frame. Keep the faces o f the frames as flush (in a single plane) as possible by matching the pieces be­ fore gluing, and by planing and sanding carefully. Mark the two surfaces which match best when the frames are held together, and on one of them, mark o ff the positions for the tacks. T A O ^ P ^ A M e Cut the heads from 50 tacks. Drill holes which will leave about an 1/8 inch o f the cut tack shaft protruding from the surface of the frame. A piece of masking tape wrapped around the drill can indicate the depth to which the hole is drilled. Rub some balsa dust, micro­ balloons or baking soda into the holes, insert the tack shafts, point up, and add Hot Stuff. It occured to me that a more satisfactory method might be to drill Set up for making smaller parts. Heavy bond paper js tenor) iu„.u , holes the size of the tack heads and it out to tack frame. Basic frame dimensions can beB chanaedcnanged totn suit ■» your °expectations. S eet p.astlc *° brmg drop the entire tack into the hole, then point up and back fill the holes with (even) as possible. Glue the top and measure the thickness when pressed epoxy or wood filler. bottom onto the frame, pressing them firm ly by hand (lean on it). Add this When the tack frame is ready, put it to the frame so that the joints will be as dimension to the 7/8 dimension of the against the second film frame and press air-tight as possible. If you haven’t yet pine frame material; the resultant di­ them together so the tacks mark the drilled the hole in the end o f the box mension is the measurement from the second frame. Drill holes slightly deeper for the vacuum cleaner adapter, do it vacuum table top to the top surface of and a half-size larger than the tack now. The hole should be such that the the support frame. Position the support shafts, at each of the marks in the adapter can be epoxied or Hot Stuffed frame pieces, drill and screw them to second frame. The frames should fall into place firm ly and tightly. A hole the box. Loosen the screws, glue gener­ together easily. The assembled frame which is a snug fit for the tube on the ously, then re-screw. Use Hot S tuff to should drop over the table onto the vacuum cleaner hose can be substituted glue the surgical tube to the support support frame no matter which way it is for an adapter tube, tape being used to frame. Locate the tubing at the center turned (up, down, right or left). seal it. o f the support frame so that the tubing The table is now ready to begin It is essential that the film contact can spread freely when the film frame is forming. It’s time for a dry run. Hook the vacuum table top when its frame is pressed upon it. Spot-glue the tubing at up the vacuum cleaner; it should fit pressed upon it. Squash the surgical first to locate it, glue the splice, and snugly. Tape the connection to make it tube between two pieces o f wood and then glue the rest o f it in place. air-tight. Lay a couple o f sheets o f bond paper on the table top and turn on the cleaner. The paper should be pulled tight to the table. Seal any joints o f doubtful air-tightness with masking tape, rubbing it down tight. Fill the corner joints of the frame support. When you’re ready to form film, start the oven (heat source). About 325° F. is good for forming the type and thickness of plastic likely to be used here. I place the box to the immediate right o f the oven door ( I’m right han­ ded) on a low (24 inch high) table. The vacuum cleaner is placed where I can start and stop it with my foot on the switch. The oven shelf goes in the middle of the oven and two bread loaf pans are positioned upside down at either side of the shelf to support the film frame. Stretch the film in the frame by placing it on the side with the holes and pressing it firm ly against the tack frame until the tacks are through the film and the two frames fit tightly together. This can take quite a bit o f pushing with .040 film. With the frames together snugly, run a piece of 1/2 inch, or Pressing frame down on vacuum table. For proper removal of plug after forming a part, plug wider, masking tape around the frame sides must be straight, or taper toward a wider base. Undercuts w ill stick in finished part. to seal it air-tight.

40 MODEL BUILDER Position the plug to be formed on the vacuum table after warming it slight­ ly in the oven (not too hot to touch and hold). Put the film frame in the oven and while it ’s heating test the vacuum clean­ er, on and off. Open the oven door after about 30 seconds and take a peek at the film. It will buckle and sag, steam and pull tight again. When acetate steams or "smokes” it ’s about ready to form. I find that about 50 seconds at 325°F. with the oven door open and closed a few times, works fine with .030 acetate. Experi­ menting with other film types and thicknesses will improve technique. Re­ move the frame from the oven and swiftly press it down over the form and table onto the support frame. As the film frame is pressed against the surgical tube seal, kick on the vacuum cleaner. The film will be sucked down upon the table top, shwop, and voila, the canopy! Wait 20 or 30 seconds for things to cool, and after turning o ff the vacuum, lift the frame and remove the plug from the plastic. The plastic can now be removed from the frame and cut to fit the model. Easy, eh? Not really so. The most time consuming and fussy part o f each forming job is the preparation of the core, form, or plug used to make the final plastic part. The plug should be wider at the bottom than the top, having no undercuts which make the Exploded view of vacuum table. This looks like what will happen if you don't fasten the parts film difficult to remove from the plug, together and then hook it up to the wrong end of the vacuum cleaner! (fig. 2) It should be very flat and smooth on the bottom. The plug should of their formability, butyrate, styrene, bed here is about 3 inches, with a 2 by 8 be higher than required for the finished vinyl and acetate. Butyrate is fuel proof, inch plug, and .040 film. Experience is, object so the formed film can be trim ­ somewhat unstable over long periods, as usual, the best teacher. med exactly to fit the model. See Flying hard and clear. Styrene is usually hard Craft shops sell glass cutters for Scale Models of WWII for instructions to find, tends to be fragile .. smells like cutting bottles. These can be used to cut on how to extend the plug for the vomit. Acetate and vinyl are tough, but glass bottle bottoms off for making canopy of an ME-109. Wheels, wheel- are susceptible to some fuel ingredients cowl forms. After making the first pants and other symmetrical parts have and cleaning solvents. Acetate tends to plastic form, make a plaster plug. Re­ to be formed in two pieces and ce­ fog when cooled too quickly or not move (?) words like “ Coors” , "Rhein- mented together to form the whole heated enough; it tends toward brittle­ gold” , or "O lym pia” , add details, and part. ness. Vinyl is obnoxious (an unclear re-form. The possibilities are quite ex­ Plugs can be made of balsa, pine or description, but if you use it you’ll tensive. I ’m about to do somecompart- bass wood. The finish of the final plastic know) and the original dust collector, mented trays for small parts, my wife piece will only be as good as the finish but is more resilient than the others; it would like a few original Christmas tree on the plug. The wooden plug can be requires lower temperatures. ornaments, and the kids have thoughtful finished with Hobbypoxy formula 2 Smaller objects and pieces o f film looks when they watch me pull cano­ glue, sanded to a 600 paper smoothness, can be accomodated by adding heavy pies. or smoother with steel wools. Do not bond paper edge-to-edge to the smaller So, there it is. All those planes that use wax on the plug. plastic sheet. Use masking tape on both looked promising for a building project Another type of plug can be made sides of the joint, pressing the tape but for the wheel-pants, fillets, cowling, using plaster. This is done by pouring firm ly to make a strong connection. etc., etc. are suddenly possible .. Well, model casting plaster into a plastic form More than one small object can be not so suddenly, but the forming pro­ made from the original wooden plug. formed on the table at the same time, cess itself does seem to be anti-climatic; The plastic form should be well sup­ just leave a generous space between it all happens very quickly. Look ported to prevent deforming by the each object for clean forming and ease through the heavy-scrap box, pick-up heavy wet plaster. Tap the plastic form of trimming. what’s necessary, inject a bit o f ingen­ rapidly and gently to prevent bubbles Small parts can be formed from uity and improvisation and . . . Pop! from forming on the surface of the plug. .0075 to .015 film , and larger parts can . . . Voila! · After removing from the plastic form, be formed with .020 to .040 film. Film the plaster can be finished with sanding, o f up to .050 thickness can be formed, and details can be added with tapes and but it is difficult to work with. How- carving. ever, the results can be outstanding on Four plastics are generally available the larger size model. The maximum for vacuum forming. They are, in order pull I’ve attempted with the unit descri­

APRIL 1976 41 PHOTO BY JOHN HARRIS l Wc nwsetr Jpns iktsu, la ntat patczd oe 82gas Bs fi 4 scns Hg sae nt a Glsonbury. u b n lasto G at ts in o p scale High seconds. 45 t h flig Best grams. 8.2 dope, plasticized , te nitra clear silk-tissue, Japanese sletter. new Waco old a b apid iety o h tissue the to directly applied be can paint Floquil using model a finishing for ue i Pau ao R by Rn Vacuum Tabl lims buit r co- t at o pasfom Mony MB) Bekly C it, k /C U erkeley B ), B (M ooney M m fro plans to parts it k -X icro M m fro ilt u b s, illiam W " le b a T m u u c a "V Ron y b SRE Waco Peanut r o o d in Super hesion compared with regular tape. It It tape. regular with compared hesion mask­ regular but part, most the for OK to like would I Now, dope. nitrate method in my discussed I month Last • SCALE FLIGHT FREE use drafting type masking tape. This This tape. masking type drafting covered beenuse has it if cover­ particularly model's aing, destroy could tape ing is This detailing. separations, for color simply or different lettering, for model both using techniques, detailing discuss with Japanese tissue. One solution is to to is solution One Japanese tissue. with id f ae a a o aon o ad­ of amount low a has tape of kind lqi adeae paints. enamel and Floquil 42 is, hr i awy ne t maska to need always is there First, you cannot remove the tape from your your from that tape tape event the the remove the cannot up, In setsyou removed. be paint should the as soon re­ to difficult become extremely and out evn ay rc, r aaig the damaging or trace, soften any will leaving naptha The (naptha) fluid dry will because it time, f o periods long for place in tape leave any to want never painted surface. painted without tape the f o part stick-urn” “ the lighter cigarette some use safely, model as and paint, to ready are you only done when be should masking So move. you However, tearing. f o fear without ae tnis I ol sy ht n a in that say would I stencils. make Many modelers use masking tape to to tape masking use modelers Many o ht h eg bcms etee”. feathered” “ becomes painted edge the compound the rub that rubbing so to with is this carefully edge to Onesolution removed. is tape the and completed n nl, o s o iiie h possi- the minimize to as so angle, an stencil a cut to painted easy thick very is with up It end edges. not do you using to advantage The electricity. static you it, use to ready you’re when and becan Frisket stores). supply art in able going keep area.an over repeatedly to need that well don't so coversyou it because problem, is painting the after up draw­ shows biggest the really but fine, is it pinch las go ie t sry perpen­ spray is to It idea edges. good the a under always bleed it even or having tape. color the masking spray for can you would Then you like edges the sealjust to dope clear of coat a on like knife a with particularly it, from Therefore, thin. very is it that is frisket by surface a to cling appearsto it rather, There backing. the from frisket the peel backing, paper a with comes for mylar It paper or a tape vellum material. isn’t thin a very masking but really product, It of stencils. place making in used a of much too isn’t this Floquil, With This thick. too is tape the that is back dicular to the stenciled surface, not at at not surface, stenciled the to dicular of fear without stencil the over brush fris­ the from made have you stencil the Skiver. Uber the but frisket, the on backing sticky no is (avail­ paper Frisket is with familiar be build-up. paint refrain prevent the along to to tape paint be masking much too would spraying from solution Another e, t s eomne ta yu brush you that recommended is it ket, b vf e r n a n d o r a m o s Whenever you are ready to paint over over paint to ready are you Whenever An item that many of you may not not may you of many that item An OE BUILDER MODEL

PHOTO BY THORNEY LEIBERMAN This is Ron Williams month! Built from Peck-Polymers kit, this Pietenpol is covered in yellow, black, and red (letters) tissue, silver struts. Weight 14 grams, almost twice the Waco! Photo by Thorney Leiberman.

bility of the paint bleeding under the but it does have a few disadvantages, flat over any kind of compound curved stencil. which can make it unsuited for some surface. That’s why I won’t use it to Frisket paper is really an item you detail paint jobs you may have. The big­ make roundels on top of wings. . there should have on hand for special jobs, gest disadvantage is that it will not lay are just too many curves involved. I ’ve tried making a stencil of an entire set of For adjuster key, break an old "Zero-zero" thrust is shown in illustration registration numbers with poor results. X-Acto blade at slot and put 5 degrees dowel down thrust gives 5 degrees After the letters and numerals were cut, top back into handle up — 10 degrees down at maximum settings it was nearly impossible to lift the fris- 10 degrees dowel down thrust gives zero up ket from its backing without tearing the thrust — 15 degrees down thrust and 10 stenciled portion. So, you have to do degrees side thrust at maximum settings this a letter at a time, and on a flat sur­ D isca rd ' face! One trick I use with frisket is for painting the very innermost circle o f a roundel.. the bull's-eye? I usually use a ruling pen, compass type, filled with Balsa nose block paint. Then I paint or scribe (I guess that’s what you would call it) two con­ centric circles of, say, the color blue. Slot cut in Then I fill in between the two circles Peck Polymers with a paint brush using the blue paint. , thrust button I repeat the same procedure using the /?Y' '/ ~ t \ (for adjustment) different colors. Typically, by the time -i/. you get to the bull's-eye, i t ’s so small that it is difficult, or nearly impossible, to scribe with the ruling compass. So, I take a piece of frisket and draw a circle, with a regular compass, the diameter o f any of the outer circles. With my circle cutter, I make a cut-out the size of the inner most circle of the roundel. I use the drawn circle as a centering guide to s f-\ V / locate the frisket paper. A quick blast with the airbrush, and the job is fin­ ished. This same template can be used several times. 1 /1 6 " dia. Incidentally, in order to prevent aluminum or punching holes in my covering when I brass tube use the ruling pen compass, I use a very small piece of servo tape. Servo tape is a foam product that is about 1/8 inch thick and is sticky on both sides. I cut a 5/16" Dia. hardwood piece about 3/16 square and place it in dowel (don't glue!) the center o f what will be the roundel. This gives a good foundation for the This cross section is point of the compass. One thing to re- eight times actual size Continued on page 82

APRIL 1976 43 “ If the good Lord had meant engines to be flat, Pratt & Whitney would have b uilt them that w a y!" • This month’s lead-in line was swiped much pressure to maintain the maga­ from the International Antique Airplane zine’s high standards and meet printing News, whose reporter appeared to have deadlines. overheard it during an antique fly-in. Yes, with editors, there is always THE EDITORS another deadline. One month's issue The late Ed Franklin, popular modeler from This month we doff our hats to all finished only means another number to New Jersey, w ith his AM LA r.o.g. Old Timer. See text for more. Photo via Dave Stott. the aviation magazine editors, who sel­ start. Without distractions, the schedule dom receive their due recognition. would be plenty punishing, but add an archives are remarkably comprehensive. Somehow, readers have a tendency to almost non-stop series of interruptions, As Georges put it: “ I won’t say he has view a magazine editor’s job as a soft phone calls, and a plethora of assorted historical documents, but he has a con­ touch. After all, they can attend flak from disgruntled readers, and you fidential book containing the unlisted contests and trade-shows on company gain a more realistic picture of the real telephone number of Leonardo da time while getting paid for it, right? editor’s life. V in ci!” And, most are world travelers who jet We would like, here and now, to The offices o f the magazine consti­ overseas to report on the exciting inter­ salute them all, and single out one for tute a veritable museum in miniature, national events, serve as judges, or special treatment, on the occasion o f his displaying all manner of aviation arti­ simply party-it-up under the guise of retirement. In company with Doug facts, paintings, photos, and models. doing their jobs, correct? Not quite. Gillies and Georges Chaulet, your scribe M. Bayet explained that his publication The relatively unseen side o f the was fortunate enough to pay a visit to now enjoys the distinction o f being the coin presents a totally different picture Maurice Bayet, Editor o f Le Modele oldest o f all French aero magazines, . . . the one which separates the strong Reduit D'Avion, in his Paris office. This model OR full-size, having been founded from the weak, the wheat from the fine, modest gentleman is one of the in 1936. chaff, the men from the boys, and the real veterans of the pioneer aviation Madame Bayet and one secretary, pigment from the hair! Back in the scene. Although his publication deals with the aid of outside contributors, January, 1973 MODEL BUILDER, primarily with model aircraft, his produce the M.R.A. magazine, and Hannan’s Hangar documented the trials personal interest and knowledge is appear to enjoy their work. The range and tribulations of Bill Northrop, guid­ encyclopedic and encompasses all French of subject material includes everything ing helmsman. Since that time, Bill has aeronautical activities. He was closely from gliders and rubber-driven models gained a staff of dedicated assistants associated with many of the early flyers through scale types and rotorcraft, (more unsung heros), but we’re willing and aircraft constructors, and his including R/C. to bet that he is still, as ever, under as memory of them is razor sharp. His Models on display in the offices

Volmer Jensen in his 8 hp Go-Kart - powered hang glider, 20 inch Tribute to Maurice Bayet, retiring M.R.A. (model aircraft mag) editor. prop, over El Mirage dry lake. Photo by John Underwood. Jill Peck and the Demoiselle she researched and built from scratch.

44 MODEL BUILDER included solid-scale and flying exam­ ples, such as a classic Antoinette, which had been constructed circa 1937. The clock on the wall was encased in a cast- metal reproduction of a radial air-cooled engine, and even Bayet’s coat-hangar was distinctive, having apparently been sculptured from an exotically-grained block of wood some six inches thick! In a back room we were shown such relics as a propeller from the original Pou-du-Ciel (Flying Flea), presented to M. Bayet by the designer, Henri Mignet, himself. And a nameplate from the Voisin factory . . . a gift from Gabriel Voisin. Not to mention stacks and stacks o f aviation books and magazines of every description. A visitor is not from the great man, via our "French Texas, 75080, publishes a newsletter aware of any visual separation between Connection” , Georges Chaulet. The which is virtually the sole "lifeline" of models and full-size aircraft lore. Quite following is a transcript of a portion of serious indoor model fliers. If your simply, this place is alive with that attempt, from a phone conversation. interest is microfilm, paper stick, or A VIA TION. indoor gliders, this is a must. Typically, Maurice Bayet is an alert, voluble, Bayet: "A n article about me? No, 3-views of model designs and technical no, I am not worth enough!" volcano of information, with enthusiasm analysis are featured, along with contest Chaulet: "B ut Bill Hannan was and energy rather unusual for a man of calendars and record reports. Interna­ pleased to meet with you, and wishes his seniority. Doug attempted to photo­ tional in scope, this publication merits graph him, and found him too fast for to publish your photo.” your support. Membership in the Bayet: "M . Hannan is very kind and his camera sh utter. . . the result was a National Indoor Model Airplane Society, sympathetic, but I hope he will not be supersonic blurr of motion. Georges’ including a subscription to News and vexed if I say it would be better to masterpiece of understatement was: “ II Views, costs $3.50 per year, surely a publish the photo of an aircraft, instead est bien vivant.” (He is very much alive). bargain these days. Or, if you wish only of an old man like me!” For many years, in addition to his the newsletter, it is available for $2.50 Chaulet: “ You are too modest, editorial responsibilities, Bayet was per year (U.S., Canada, or Mexico). Mr. Bayet!” president of L'Association des Amis du Overseas modelers may obtain a sub­ Bayet: "Well, I don’t like when Musee de I ‘Air (friends o f the French scription for $3.50 (surface mail rate), people speak about me. For instance, air museum), where he contributed a or $5.06 (air mail rate). great deal toward supporting the activi­ last year I was given the Medal of ties of that splendid institution. Aeronautics and I said nothing about it WANNA BUY A RACER? Not a model, but the real thing! By way of comic relief, in the midst in M .R.A." Rudy Profant, of 4060 West 158th St., of our frantic efforts to exchange infor­ Chaulet: “ I repeat that Bill would Cleveland, Ohio, 44135, has decided to mation, in two-and-a-half different be happy to speak a few words about languages, we flew one of our tiny you and the M.R.A. . . . ” sell his Marcoux-Bromberg Special, a helicopter models and the Escondido Bayet: "Well, just a very few words, fabulous plane o f Racing’s "Golden Age”. Mosquito in the editorial office, to the and perhaps he may put the picture of One of our photos shows the machine as accompaniment of applause from the a Peanut?” it appeared during 1936, as the Gilmore staff! It was indeed with great reluc­ Although we are disappointed not to No. 54. Originally numbered "9 ” , it tance that we took leave from this have a photo of M. Bayet to share with appeared at the 1934 Bendix Trophy marvelous place, but not before being you, we offer instead, per his suggestion, Race, but did not participate. In 1935, presented with an autographed copy of the photo of a Peanut. Appropriately, it flew, but didn’t place. M.R.A., in the fine hand o f Maurice we have selected a French Peanut, the By 1936, things were looking up, as Bayet, editor extraordinäre! Demoiselle, constructed by an American it placed 2nd in the Thompson Trophy Since learning of M. Bayet's retire­ Demoiselle, J ill Peck. Race, and repeated that performance in ment after our return to the U.S., we INDOOR NEWS AND VIEWS the 1937 Bendix. During 1937, it snared made an effort to obtain a photograph Bud Tenny, Box 545, Richardson, Continued on page 79

"M r. Mulligan," constructed by Stan Fink, Eugene, Oregon, from Another btan Fink and Carol Cogswell combined effort, Castaibert MB plans by Hank Nixon. Photo by Carol Cogswell. IV from Walt Mooney s plans in MODEL BUILDER.

APRIL 1976 45

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number o f free flighters in the Southern California area to get pretty excited. It’s all Mel’s fault that there’s no more V.T.O., so the complaint goes. Just as though Mel has cast the deciding vote. Just as though the other 6 members of the F.F.C.B. hadn’t voted. In a demo­ cracy, the constituents do what any constituency would do . . they petition and criticize. Only problem is: This isn’t a democracy. This is a representational government. In that form of govern­ ment, the one who is accused of not representing usually steps down from his post. Mel has done this. Should be the end of it, right? Wrong. The petitioners now want the balloting declared invalid. The reason being that Mel didn’t represent the wishes of the majority. Could be? How- ever, as is usually the case in matters of this sort, the majority seldom makes its wishes known until it has been slighted. Mel’s original position was to follow the wishes of the majority as he was able to identify it at the time. Since it is not the position of this writer to continually speak out on mat­ ters political, I intend to address this topic at this time and promise not to get into the habit o f debating issues of this sort via the pages of MODEL BUILDER. I should also add that the following statements are the opinions only o f this writer and do not represent the thoughts of this magazine or any other body. At this point in time, whether Mel Schmidt represented the majority of the free flighters in his dis­ trict is o f little consequence. He voted as he believed he should vote. So did six others who voted as Mel did. The other four also voted as they believed. That’s how the process works. When Mel voted, his vote was valid. He was the F.F.C.B. representative for District X. His vote cannot be declared invalid. Such a movement would destroy the entire rules-making process. The rules change has been made and it will stay that w ay. . in fact, it must stay that way. Mel has fulfilled his duty .. rightly or wrongly, and he has been replaced. The rules change must not be replaced. For those who are lamenting and gnashing their teeth over the change, y o u r charge is clear. Propose the addition of V.T.O. for the next rules change cycle. That is also how the pro­ At the Heart of Dixie F/F Champs, in Oct. '75, District V AMA Veep Jim McNeill launches his cess works. Keep in mind that it may Coupe. He was high point winner of the meet. All H-of-D photos via George Batiuk-.

APRIL 1976 51

(shown actual size) Stab airfoil (R -8.6, thinned to 6%) SCALE - 1:6 "SLO-POKE" FA I I FA POWER SHIP CHARLIE MARTIN'S

104 SQ.IN. 468 SQ. IN. 745 G R A M S ------S TA B . A RT E O T A A L (PROJ.)ASPECT ------RATIO 572 SQ. — IN . 12.1 TO 1 W IN G A R E A W E IG H T A " 2 2 j mil i i i i i j mil ► ( ------7"d X 3.5"pCox 'repro' N) CJ1 MODEL BUILDER Brian Webster, Tullahoma, Tenn., launches his Half-A. He placed Jim Lewis, College Park, Ga., former Dick Black and Mulvihill fourth in Open Class, at Heart of Dixie Champs. trophy winner, launches his Coupe for 1st place. not fare any better next time around. That's the reaction I have heard from sections, such as the NACA 6409, and Such is representative government. numerous other free flighters. flat-bottomed stab airfoils. In the 1954, Petitions are out of place .. now. So, rather than take your models a fellow by the name of Rudolf Lindner Now is the time to fly with the no- home and sit in the corner and suck on changed all of that. With the addition o f V.T.O. rule. You may find out that you your thumbs, why don’t you get to­ a high lift, undercambered stab section, like it. gether and write up a new proposal for he reasoned, one could reduce the area Speaking personally, I hate to see V.T.O., then try to solicit support for on the stabilizer and put more in the V.T.O. go. I enjoyed it. I enjoyed using your cause from all o f the F.F.C.B. wing, thereby increasing the wing’s ef­ it and watching it. But it is gone. A t members across the country. Maybe the ficiency, without destroying any of the least for now, it is gone. But more than next time, things will go your way. In stab’s ability to recover from upsets due hating to see V.T.O. go, I hate even the meantime, let’s accept the defeat to rough weather, poor launches, and more the poor sportsmanship and the with a little grace. the like. In fact, with a more powerful character assassination that has been For some reason, the rules change stab, it was possible to have b o th . . . heaped on one individual for the way he doesn’t seem to indicate that the world better glide duration and recovery. has voted. I would venture to guess that is ending. Thus, the Lindner stab section was de­ the vilification that has taken place DARNED GOOD AIRFOILS . . . veloped. It, and an improved wing sec­ since Mel’s vote has done more around LINDNER STABILIZER SECTION tion, changed the world o f A/2 flying the country to draw people to Mel’s In the early days of A/2 flying, most for its day, and changed it as dramati­ support than any other thing that could o f the models had comparitively low as­ cally as the current circle tow systems have happened. That’s my reaction. pect ratio wings, with good old standby have changed current practice. Histori­ cally, it is this stab airfoil which brought about the change. Worth a try, wouldn't you say? MYSTERY MODEL FOR APRIL This one should give little trouble to Continued on page 81

4

Al Dodson, Contest Director for the Heart of Dixie Championships, is doin' the sittin', while H-of-D reporter George Batiuk Sr. VTO's assistant Ray Deep does the standin'. (maybe for last time) his 1/2A-A ship.

APRIL 1976 53 FMM DIAMOND

By KEN WILLARD . . . Whet your designing appetite on this interesting configuration that's been around for many years, but has never received the recognition it deserves. One evening w ill do it.

• Fifty years ago, a young English Even though he persisted, Norman some "advanced aircraft designs,” such aircraft designer, Norman Hall-Warren, Hall-Warren could not get sufficient as an "unusual double-wing configura­ experimented with models and found backing, for various reasons, for his tion." An artist’s concept was distri­ that the rhomboid planform for wings, concept. buted to the press, and it was published if properly configured for angular set­ Articles have been written through \n Aviation Week and Space Technology, tings between the forward wing, which this time-span regarding the rhomboid a prestigious trade magazine. sweeps back, and the rear wing, which concept, and about six years ago I was People familiar with the concept sweeps forward, was not subject to intrigued, and, together with my friend were quick to point out the long history stalls or spins. He patented the concept, Bob Andris, built a radio controlled behind it. It will be interesting to see and set about getting backing to build version. It was completely successful, what future actions take place. a full-scale test craft. He was unsuccess­ and we turned our test results over to Meanwhile, I thought some of you ful. It is amusing to note that at one Hall-Warren for whatever use he could model experimenters might like to try point in his efforts, he received a com­ make o f them. flying a simple free flight version. So, munication from the British Air Ministry, Nothing happened . .. with a few pieces of balsa, some paper in 1937, which said, "There is no future Then, recently, the National Aero­ clips, a small block of hardwood for an in swept wing aircraft." How about nautics and Space Administration engine mount, and some five-minute that! announced that they would be studying epoxy, the Flying Diamond came into

A ll sheet construction makes this little experimental ship a one- Dig that fresh-air canopy . . . first one we ever saw that could rust! evening project. R/C possibilities are interesting. Diamond wing/tail is built in one piece and sprung into place. 54 MODEL BUILDER FULL SIZE PLANS A V A ILA B LE - SEE PAGE 94

being. With a Cox .010 up front, it will a slot in the top of the fuselage and the fuselage and let it harden. Be sure spiral up almost out of sight with a full epoxy the fin in the slot so it will be on the center ends of the rear wing are tank of gas, and then glide back in a the center line. I t ’s not critical . . . below the tail of the fuselage while the gentle spiral to land. The upward spiral nor is the shape, so long as you keep front end is drying in place. They can’t is to the left, and the downward glide close to the overall area. be put there afterward! You will note turns to the right . . . just like a good The fin and rudder are joined with that due to the twist in the rear wing, old fashioned sport free flight . . . light paper clip wire epoxied to the the leading edges at the center don’t except it won’t stall. Mush, yes, but surfaces. This wire is soft and makes it quite meet. No problem, just epoxy no stall. And if you adjust the rudder easy to adjust the rudder setting. Use the wings to the fuselage at the tail so correctly, it doesn’t mush, but climbs the same wire to form the "canopy.” they are right in line with the bottom of up and out in a solid climbing turn. Now you are ready to mount the the fuselage. That gives the right align­ Incidentally, it is just a bit sensitive on wings. Epoxy the forward center line to ment for flight. Continued on page 91 the engine thrust setting, requiring right thrust and downthrust to avoid a steep spiral glide when the engine quits. Building the Flying Diamond is a breeze. As you can see from the drawing, the wings, fin and rudder are cut from 3/32 sheet balsa, 3 inches wide. Butt join the center line of the forward wings, and epoxy the 3/32 doubler in place. Don’t join the rear wings. Cut out the fuselage from 1/4 inch sheet balsa. Epoxy the hardwood (I used basswood) engine mount block to the side o f the fuselage, and shape to fit the backplate of the integral tank on the .010. Epoxy the fin right to the side o f the One thing sure . . . the pilot can't complain about ground visibility fuselage. If you’re a purist, you can cut when landing! Soft wire on rudder holds trim setting. APRIL 1976 55 with a firm that makes such an outgoing effort in support o f model yachting. The next step up the scale ladder brings us to the Friendship Sloop hull being offered by Heritage Marine, 36 H aw th orn e A ve., Needham, Mass. 02192. The hull is 34 inches overall, with a generous full form which should allow easy installation o f the usual R/C gear, winch and associated batteries. The directions for completion are a guide rather than a step-by-step treatise, so I would recommend that as a mini­ mum, one arm himself with a copy of American Sailing Yachts, by Howard Chappclle and use the chapter on Friendships to help fill in the details of deck outfitting and rigging. This boat is unusual in that the main boom over­ hangs the transom, preventing the use of a permanent backstay. By leading the shrouds somewhat more aft than is usual, a tripod arrangement o f shrouds and jibstay can be effected to properly support the mast. The producer is not pushing for racing these round little gems, but I would suspect that if two or more happen to light on the same chunk of water, the competition is inevitable. At the moment, the boat can be regis­ tered within the Open Class of AMY A. The Open Class secretary has come up with some non-racing events that will be on the Regatta schedule, and it would seem to me that a Friendship, with all that sail area and the big rudder, would be just the ticket to take home some of that silver, and look pretty while doing it, too. Hull of this Friendship Sloop is constructed in an interesting way. See text. Built by Frank I have two of the hulls tucked away Hansa, Staten Island, N.Y. Photo by Richard Surving. and must confess to thoughts of draw­ ing the bowsprit out only far enough to make the boat 35-7/8 inches LOA, put­ ting up 600 square inches of 2 oz Dac­ ron and just seeing what something like that would to in the 36/600 wars that are scheduled for the 1976 season. Might be that she would be a good light air performer with the right attention to overall displacement. • W hile pursuing the trail of the 5th grade students have used them as For specific information on availa­ Friendship Sloop, I was lucky enough to class projects with complete success. bility and prices contact Heritage Ma­ run across an advertisement by Replica Maybe we have an alternative to the rine directly. They are also stocking a Seacraft. A quick response from them plastic quickies which seem to abound limited selection of books pertinent to put me in touch with Richard Surving. on all the hobby shop shelves. The as­ model yachting and you should ask for He has developed an idea for boat sembly manual is very clear and could their listing. model building which imitates that of be used as a basic approach to R/C Got some clear photos o f yet another ferro-cement construction. It provides a yacht building as far as hull construc­ period model from Bill Nussbickel of mini-training course to the homebuilder tion. There is also a neat collection of Yonkers, New York. Bill has since re­ who may be contemplating making a building tricks hidden in the manual placed the sails on his model, but the full-sized boat for himself. He offers dis­ which I've tucked away in my head for “ before” shots make a couple of impor­ play kits of the following: later use. A compendium of such tricks tant points. First, notice that in the 19’ Cape Cod Catboat. . .9-1/2 inch is made available to kit owners as part water shot the jib leech is quite loose. model, at $9.95 plus postage o f a model builder’s sketch book. For This is a result of having leech tension 23’ Prudence Sloop. . .17-inch further information on Replica Sea- controlled exclusively by sheet tension. model, at $ 14.95 plus postage craft’s offering, send a 13c stamp to As the jib sheet is let out, the downward 2 5 ’ Friendship Sloop. ..1 5 inch them at 44 Pommer Avenue, Staten Is­ component of its pull, which tightens model, at $12.95 plus postage. land, New York 10304. And when you the leech, gets smaller and smaller. As a As you can sec from the photos, the do, tell them that MODEL BUILDER result, the jib clew lifts, the leech slack­ boats turn out with an excellent scale sent you. ens and the jib spills the air instead of appearance, and with the joy o f real I ’d like to thank Mr. Surving for his providing power. This can be easily re­ scratch-building, as these are definitely unselfish sharing of materials with me, medied by offsetting the jib club attach­ not plastic "snap-together” models. Vet and would highly recommend dealing ment point to the boat’s deck about one 56 MODEL BUILDER Prudence Sloop under construction, same method as Friendship. Bill Nussbickel's gaff rigged sloop w ith new sails and some recomm­ Full size plans with each model. Photo courtesy Rudder Magazine. ended rigging changes. See "before" photo below. inch aft of the front of the club. Alter­ board side o f the upper part of the sail. when underway. We also have a shot of natively, a vang can be fitted, but the This does not spell e-f-f-i-c-i-e-n-c-y. It Bill’s boat with the new sails on it, and specific arrangement on Bill’s boat does spell a need for a simple vang must thank him for the opportunity to would require a little thought. which might be fitted with a little fid­ use his fine little craft as an example o f Second we observe the main leech to dling. Such adjustments can be made, sail set and trim techniques. I might add be slack, and the main boom lifting se­ and made in such a manner that the ap­ as postscript, that just as in a racing verely. If the wind were blowing from pearance o f the vessel is not damaged. boat, a forestay which is connecting the you down your line o f sight, the pres­ Vet the performance o f the boat will masthead and the bow should be left as sure would be felt on the port side o f improve, and its appearance under sail loose as possible if its presence is re- the lower after mainsail, and on the star- will improve. No prototype ever let its Continued on page 84 main get into that configuration. It takes only a little more effort to insure that your scale sailing vessel looks scale

"Before" shot of Bill Nussbickel's gaff-rigged Heritage Marine's 34 inch LOA Friendship Lon Hocker built and took photo of this 6 ft. sloop. Both photos taken by Bill. Sloop hull. See March '76 Classifieds. Massasoit coastal schooner. See text for more.

APRIL 1976 57 size (3-1/2x2-1/4x1) makes it ideal for the field box. “ The next test instrument is your TV set. It can act as a large screen oscil­ loscope to view the RF pattern o f a properly functioning transmitter. In fact, as shown on the flowsheet (insert) this is a good test for a transmitter. It does not matter which frequency you are on. Just extend the transmitter antenna fu l­ ly, place the transmitter near the TV, and flip through the channels until you find one that is obviously “ blitzed” by your signal. Harmonics o f your trans­ m itter occur all through the VHF (chan­ nels 2-13) and UHF (14-83) bands. Ad­ just the Vertical Hold knob on your set until the lines across the screen stop moving. You will then notice that if you move one o f the controls on your transmitter the spacing between the lines changes: in fact, this is how your Independent suspension car belonging to Ronny Ton of Holland. Future article w ill cover Europ­ transmitter generates information to the ean suspension systems, with pictures and notes courtesy of Tom Martin, from England. receiver and servos. The point is, if you cannot find a station that is “blitzed” by your transmitter, it just isn’t putting out an RF signal, or possibly a very weak R/C AUTO NEWS one. “ Switches, connectors, wiring, and By CHUCK HALLUM batteries are the most prone to failure; therefore, these are the things that we • Once you have a car built and track- these magic boxes function, there are a concern ourselves with primarily. Nickel- ready, what do you do to get it going re­ number o f things you can do if there is cadmium batteries have a cell voltage of liably, and at top performance. There are a problem. Just keep your cool and go 1.3 volts per cell when fully charged. really three things to consider; radio, en­ after the problem in a logical way. With this bit of knowledge, we know gine and car. The radio has to function There was a very good article in the Jan­ that a four cell receiver pack should properly or else you'll be afraid to put uary 1975 issue of MODEL BUILDER, measure 5.2 volts immediately after your car on the track. "Digital Radio Trouble-Shooting” , by charging. If you should measure less Radio reliability and repeatability Victor Baney. I found the article very than this voltage, you can assume that will allow you to ‘shakedown’ (set-up) a helpful and logical. The trouble­ there are one or more defective cells. new car without questioning whether it shooting flow chart is reproduced here. Again, a simple test with your VOM was the car or radio which caused some­ In going through the flow sheet I find will locate the bad cell or cells. You may thing to happen. Obviously, if the en­ that I have done many of the things replace them, or you can find a friend gine isn’t running right you won’t learn noted by Mr. Baney. Here are a few ex­ who is handy with a soldering iron. what your car is capable of doing. So cerpts from the article, which help ex­ (Replace with same type o f cell, such as before attempting to fix or improve car plain the flow chart and point out im­ G.E. with G.E. etc.) handling, the radio and engine must be portant items. "Wires are always subject to pulling, functioning properly. There is nothing “ First of all, if you don’t already have turning, twisting, and vibrating. The end more frustrating than to have radio or a volt meter, I recommend the purchase result will be a broken wire. Careful in­ engine problems when you want to get a of a low cost volt, ohm, and milliamp spection o f the wiring in a receiver/ car set up. meter, usually referred to as a VOM. servo arrangement will generally produce A reliable radio is probably the most While there are many on the market, a few connections which are “ hanging” important thing to have if you want a the one I recommend to the average by one or two strands of wire. This is an good performing car. To most people, non-electronic R/C’er is the Micronta accident looking for a place to happen! the radio is just a magic box (or several). Model 22-4027 handled by Radio Shack. This situation commonly produces a non­ Even though you don’t understand how It sells for about $5.95 and the small operative or interm ittently operative

On stock Veco .19 carburetor, the bleed air adjustment (pointer) controls idle fuel/air mixture. Clockwise rotation richens. 58 MODEL BUILDER Poor or No Ground Range Radj(J s m ..Dead.. F|ovvsheet F low Sneet

radios, and can cost you an airplane postpaid.) little smoother than water and terra (and maybe more) if not caught early! With cars, there a few more radio firma, wen) If the radio equipment is "Switches and connectors are exposed problems to worry about than in air­ mounted too solidly, vibration can to dirt, oil and general pulling and tug­ planes and boats. In cars, most of the cause early fatigue failure in wires. I ’ve ging. Again, this can result in intermit­ parts are metal, and the antenna leads had wires break in the receiver, servos tent to complete system failure, with can short to the chassis, or metal parts and battery pack. Connectors will also time. Careful inspection is the key here . . . so check this when the table indi­ come loose, if not tied together. also. Frequent spraying o f denatured al­ cates possible receiver antenna prob­ Vibration, and the constant servo cohol on these parts is recommended. lems. Also, on some radios, the antenna motions required in cars, can also cause The alcohol does not harm the plastic uses a tuned “choke” to cut down on the servo feedback pots to get dirty in a used in servos, switches, and connectors, antenna length. Be sure that the choke short time. When the feedback pot gets and does cut the dirt and oil from these and all antenna are at least a 1/2 inch dirty, the servo jitters a lot near its nor­ troublemakers”. away from metal parts. Vibration in cars mal operating position. To clean the (Copies o f the January 1975 issue, is much worse because wood instruction pot, carefully take the servo case apart. containing the complete trouble-shoot­ in aircraft and boats absorb and damp The pot is connected to the output of ing article are still available at $1.25, quite a bit of the vibration! (also, air is a the gear-train, and the pot rear cover is

Perry carb idle disc (pointer) controls idle fuel flow. Clockwise rota­ Perry carb main needle valve (pointer) controls full throttle mixture. tion decreases fuel flow, leans out idle mixture. Clockwise rotation decreases fuel flow, leans out mixture. APRIL 1976 59 trol to the “ full on" position and check to see that the carburetor is wide open, and brakes fully released. Adjust the linkages as required and be sure that there is no binding or restriction o f throttle servo motion. Most carburetors have instructions which describe nominal settings for en­ gine idle and full throttle. Put the set­ tings on the carburetor and start the en­ gine. There are a few things to check for if you’re having trouble starting the en­ gine: glow plug and starting battery, cranking engine in the right direction, and fuel (sometimes old fuel can be a problem). If you still have problems starting the engine, note if there is any fuel mist coming out the exhaust. If the fuel mist is noticeable, the idle mixture ...with the is probably too fuel rich and should be leaned out a little. In a Perry carb, turn the idle disc to the right, slightly, to cut K&B 3.5cc down on idle fuel flow. On a stock Veco carb, open the idle air screw to allow more idle air flow, or as a last result, (.21) R/C follow the directions for your carb! If the exhaust is dry, you may have to richen the idle a little. INBOARD OK, now the engine is started. Don’t disconnect the starting battery yet, but adjust the idle mixture for the fastest en­ ENGINE gine speed, then richen the mixture a b it .. more fuel on the Perry and less To meet the growing bleed air on the Veco. If the idle speed demand and interest in seems too fast (or slow), adjust the idle R/C Boating, K&B intro- i speed screw until you get a smooth low duces their ALL NEW 3.5cc Features include: speed idle. You may have to go back (.21) R/C Inboard Engine. Designed • Efficient Muffler—under 90 dec­ and reset the idle mixture again, and specifically as a marine engine, it reflects ibels · ABC Cylinder and Piston don't forget to leave it a little on the all the engineering know-how and quality pro­ • Ball Bearings · Water-Cooled rich side. Now disconnect the starting Head · Advanced By-Pass Port­ duction of K& B . . . the leader in the model battery from the glow plug. The engine ing · Balanced Flywheel · Rear engine field. It is powerful, rugged in construc­ should idle for at least 5-10 seconds Exhaust — Butterfly Throttle without having to blip the throttle to tion, has K& 8 dependability to assure • High Density Aluminum Die keep it going. Quite often, engines load countless hours of high-performance opera­ Casting — for greater strength tion. Easy to start, no break-in required. • Rotatable Case (center block) up a little when idling, and require the Precision machined U-Joint Nut fits most — permits changing of exhaust throttle blip to clear them out. If the existing ball drives. from forward to aft position. engine dies quickly after the glow plug starting battery is removed, the plug may be improper for the engine/fuel combination. A hotter plug may be re­ K&B MANUFACTURING quired. If the engine stops when the en­ DIVISION OF AURORA PRODUCTS CORP. gine is blipped, the full throttle mixture 12152 WOODRUFF AVE., DOWNEY, CA. 90241 may be wrong. When you h it full-throttle from the idle position, with the rear wheels free, normally held down with two screws. wires to fatigue so that only one or two the engine should accelerate to full Mark the cover position and remove the strands complete a circuit, or cause a speed without sags or hesitation. If the two screws and cover. Spray the resistor joint to partially separate. When this engine quits, listen to the sound to de­ and wiper contacts with TV-type elec­ happens in the battery or power stage of termine if the mixture is rich or lean. tronic spray cleaner and wipe with a a servo, the servo speed many also be Usually, when the full-throttle mixture clean rag. Then spray again, let dry, and slower in one direction than the other is rich, the engine will four-cycle, load reassemble. when under load. up and pop a few times before quitting. Cars also drain the receiver/servo bat­ Now let’s get to the engine set-up. If lean, the engine will speed up some tery at a relatively rapid rate. Quite Here the engine idle and full throttle and the sound weaken as the engine often, the steering motion and brake mixture will have to be set and then we quits, but the type of sound will not action will be sluggish because the bat­ can see if these settings remain consis­ change because the engine stays in a tery is partly discharged. If you note a tent through a tank of fuel. Before start­ two-cycle. Adjust the fuel-throttle trim shift (to keep the car going straight ing the engine, turn on the radio trans­ needle valve about a 1/4 turn in the pro­ with the control released) or the steer­ mitter and receiver and check that the per direction (if it was too rich, turn the ing being slower in one direction than carburetor throttle barrel is almost needle valve clockwise.. to the right the other, chances are that a cell in the closed and there is slight rear wheel . . .to lean it down, or if too lean, turn battery pack is failing and will have to braking action when the throttle control the needle counter-clockwise to open be replaced. Sometimes vibration causes is released. Next, move the throttle con­ the needle valve), and try again. Under 60 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER THREE CLASSICS FROM THE WILLIAMS BROTHERS!

BOEING 247 MARTIN B-10B NORTHROP GAMMA A delightful trio of 1/72 scale plastic kits for the as Hawks' "Sky Chief" or Ellsworth's "Polar Star"; the serious collector/builder. These finely detailed min­ Boeing as Turner's racer or a United airliner; and iatures feature choice of decals and extra parts for the Martin in different squadron markings. PRICES: variations. For example, The Gamma may be finished Gamma: $2.95; Boeing: $4.95; Martin: $4.95^^^- FROM YOUR DEALER OR ORDER DIRECT, ADDING 15% POSTAGE AND HANDLING. ALSO AVAILABLE: FLYING MODEL ACCESSORIES · ENGINE KITS • MACHINE GUN KITS < 3-VIEWS .VÍ l U a h s 25« FOR COMPLETE CATALOG: DEPT. MB · 181 PAWNEE STREET, SAN MARCOS, CALIFORNIA » 92069

load, with the rear wheels on the engine will hold these settings through a Again, these usually cause the engine to ground, when going to full throttle from full tank of fuel, maybe two, to simu­ lean out. Check all o f the above as nor­ idle, the engine should speed up and late a race. Usually the engine will have mal race-day (or practice) preparation. hold the maximum load speed in a good a tendency to lean out, either with time, When the engine has a definite ten­ two-cycle. or as the fuel level goes down. Some of dency to lean out as the fuel level goes Once the full-throttle mixture has this may be due to the engine overheat­ down, the problem could be the fuel been set, go back and check the idle. ing. If you have a heat-sink clamped on tank/carburetor combinations. The first There is a slight effect of the idle and the head, be sure the contact is good, thing to do if fuel level affects engine full-throttle settings on one another, so clean, and the alignment correct. The settings, is to make the idle and full- it may take a couple of tries to get both sketch below shows the proper align­ throttle settings when the tank is almost set about right. ment of the heat sink on the head to empty. In this case, make the mixture assure maximum contact area between Now it is finally time to put the car settings as lean as you think they should the two. Quite often, I've seen' the heat on the track to see what happens. Start get. If the settings are much too rich sinks clamped much too low on the the engine and place the car on the when the tank is full, you may have to head, so that only part of the surfaces track ..d o n ’t forget to turn the radio change the fuel system, as noted below. are in contact. Of course, with an inte­ on. Just drive the car around the track Correct size carburetors (stock or Perry gral-head (one-piece) heat-sink, this will once or twice, listening to the engine 19) on 19 or 21 engines have good fuel not be a problem. Next, be sure the en­ driving acceleration, full-throttle, and draw and normally experience leaning gine, cylinder fins, and heat-sink are idle. Since the idle condition is un­ out problems as the fuel level changes. clean. Dirt and oil will not allow sur­ loaded, it probably will not be much Usually, the problem occurs with the faces to transfer heat properly to the different from the original setting. When big-bore carbs, 40’s and 60’s, when used air, causing engine overheating. Clean going down the straights at full throttle, on a small engine, because o f poor fuel is the engine running in a four-cycle engines and heat-sinks are particularly important for lay-down engine installa­ suction. Usually a constant pressure (fuel rich), or is it running in a two- (slight vacuum) "chicken-hopper” tank tions and engines fully enclosed in GT cycle? Obviously, if it is always in a will solve excessive leaning out problems or sedan bodies. four-cycle you should turn down the on 19 to 40 size carbs. But with larger main needle valve a little. When the en­ Next, check to be sure that the brake carbs, the fuel tanks must be pressurized gine always runs in a two-cycle at full releases fully by the time the throttle is (muffler pressure) or raised considerably throttle I would recommend opening about 1/4 to 1/3 open. If the engine has to gravity-feed fuel. But if you’re using the needle valve a little to be sure the to work against the brake all the time, a 60 carb, you probably are aware of setting is not too lean. Normally, I al­ engine overheating will result. Some­ everything noted here or you shouldn’t ways like to practice with the engine times engines do not hold settings be­ be running a big bore carb. A pressur­ top end a little rich so that there is a cause o f a crack or hole in the fuel line, ized fuel system can be used with 40 hint o f a four-cycle. Only when getting or dirt in the fuel filter or fuel tank. carbs but I don’t think pressure should ready for qualifying or heat races do I lean down the top end for maximum straight away speed. The engines last a HERB WAHL'S 10th YEAR lot longer that way. If, during acceleration, the car surges ahead, then sags before picking up speed IGNITION ENGINES again, while the engine continues to run in a two-cycle, then the idle mixture is PARTS & SERVICE too lean. Just richen (more fuel or less air) the idle mixture and go out again • SPARK PLUGS · COILS · CONDENSERS for a few laps. If the engine loads and • MACHINING · WELDING · HONING runs in a four-cycle before cleaning out and accelerating properly, the idle mix­ • ENGINE PARTS · OVERHAUL SERVICE ture is too rich. Cut down the idle fuel or let in a little more bleed air. Idle mix­ ture settings on most carburetors are SENO CURRENTLY IN PRODUCTION 504 HERBS MODEL MOTORS quite sensitive, so only make very small «he FOR NEW PO Box 31 40th ANNIVERSARY BROWN JR BROCHURE adjustments. Crum Lynne. Pa. 19022 The next thing is to find out if the ’ Ψ

APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 61 RUDDER O L D T I M E R R/C This may look overly sturdy, but SCALED FOR .049 - .15 POWER remember, this assembly takes a con­ “ Small enough lot a schoolyard-la/ge enough to compete siderable beating if the plane flips over on landings. The drawing is pretty much self-explanatory, just use light but firm wood. The hinges are not installed until after the model is doped. Authentic Scaling STABILIZER Full Size Detailed Plans Use the tracing paper and Spray- Machine Cut Parts ment technique to cut out a set of Selected Balsa A Hardwood Meets S.A.M. Rules outline parts from 1/8 sheet. Pin outline in place, cut spar as drawn (this should be hard balsa) and glue in position. MICRO MODELS Place center section fill before rib blan­ Dealcr/O lstrlbutor inquiries Invited. P.O.BOX 1273-A M ail orders: Add 10% lor postage & handling ks. The ribs are pieces o f 1/16 sheet COVINA. CALIF. 91722 Calif residents add 6% sales tax scrap from wing rib blanks, be certain the piece is flat on the bottom and at least the height o f the spar. After the glue has set over night, sand rough rib Kustom shape with 150 sandpaper in a block, then remove from plan and complete Kraftsmanship the contour with 220 paper. Try to sand in the direction o f the rib grain. Take a little time and go slowly to avoid cracking the ribs. If you do crack one, STOCK OR CUSTOM Hot Stuff is great for repairing it. TUNED ENGINES FINISH Sand everything with 220 paper, PARTS AND then give all structures 3 coats of clear COMPETITION . . . this beautiful Monocoupe by Megow? dope, sanding lightly between coats. If ACCESSORIES One of the four most super-detailed plans that Megow ever made. this is your first go at silk, I ’d suggest We have this, plus many others, print­ doing the wing first. Iron the silk to ed in clean black line. For catalog, send remove creases. Cut out 4 panels of silk Fiberglass props, fuel shut-offs, solid .50°. refundable with first order. slightly oversize with the grain running lines and many other specialties you GOLDEN AGE REPRODUCTIONS spanwise. Place first panel on the bot­ cannot find in hobby shops. P. O. Box 13, B raintree. Mass. 02184 tom o f the wing, position and line up so also the silk grain runs fairly straight, then A complete line of COX .049/.051 W esťner...... Continued from page 13 spray lightly with water; I use an old custom engines, including R/C peel pattern off. Use ply template to cut Windex spray bottle. After the silk is modifications. rib stacks o f light C-grain balsa. Select wet, any wrinkles can be smoothed out unwarped 3/16 x 3/4 preformed trailing by gently pulling at perimeter. When all All 1/2A products formerly by edge stock, mark rib positions, cut slots, is smooth, stick silk to perimeter with Kirn-Kraft (Dale Kirn) are now and pin to plan. Position bottom 1/8 x thin (5-50) clear dope. Do not feel available solely from KUSTOM I /8 spars as ribs are glued and pinned in rushed in positioning the silk, a little KRAFTSMANSHIP. place. The leading edge is shimmed up more water can be sprayed on to add to proper height with scrap, then ce­ working time. Trim edges against the For detailed brochure, mented to ribs. Tips are cut from 3/16 wood with a new double edged razor send 13 cent stamp to: long grained balsa (A sheet), observing blade (it’s difficult to get a smooth edge grain direction, glue three pieces to­ out in space). Silk the top panel in the KUSTOM KRAFTSMANSHIP gether then position and glue to bottom same manner, lapping over at L.E. and P.O. Box 2699 spars and front and rear edges.. add T.E. onto bottom panel. Trim to cover Laguna Hills, Ca. 92653 top spars after tips are in place. previous joint. The fuselage is covered in Build a right and left panel. the same manner, making joints for four Notice center section uses four ribs panels on top and bottom longerons. be used on 19 carbs. Chicken-hopper to give a double rib dihedral joint. Tail feathers are done exactly like the tanks can and should be used in all in­ Allow all panels at least 8 to 10 hours wing. stallations. There was an article several drying time before removing from plan. The most annoying problem in dop­ months ago in R/C Auto News on Remove wing from plan, block up ing silk is the tendency for the first chicken-hopper tanks and fuel systems. wing tip 3-1 /2 inches, and sand dihedral coats to penetrate the weave and run With all the driving you’ve done to angle into spars and ribs, using square down inside, leaving an unsightly smear. get the carburetor set, you've learned a table edge as is done with hand launch There is a way to avoid this; Knox little about how the car handles. We’ll glider panels. Pin center section flat, Unflavored Gelatin. No, I’m not out of get into some of the most important block up tip 3-1/2 inches, and join with my tree. This really works! Just mix a things for car adjustments next month. epoxy. Repeat with opposite panel. package of the stuff as per package In case you haven't got the article on When epoxy is set, cut notches for ply directions, then dope the silk with two fuel systems, or other important back dihedral braces and epoxy with 5-min­ coats of the warm gelatin. The first articles, write to me c/o Model Builder ute epoxy, holding them in position impression is rather startling (the model Magazine, or P.O. Box 4658, Irvine, CA with clothespins. Add gussets and 1/16 looks like a prune) but when the gelatin 92716. X I /8 cross pieces, sand leading edge and dries or sets (I’m not sure which it is), Hope you can wait 'till next month tip contour, and cut and carve center the silk tightens back and the weave is to adjust the c a r.. just be sure the radio section front and rear fillers. The wing is filled. The West-ner as pictured, has but and engine work right. · now ready to smooth up and cover. three coats of clear dope, yet is well 62 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER CARL GOLDBERG

43” SPAN 29 v2’ LENGTH 390sq. in. AREA

KIT G25 $13.95

ΓΗΕ ALL NEW CONTROL LINE E M i a r c i i

STUNTER FOR .19 TO .35 ENGINES PLANS ALSO SHOW R/C VERSION, FOR 2-3 CHAN. RADIO, .15 .19 ENGINES EASY TO BUILD - EXCITING TO FLY Something new! The thrilling and historic P-40 Flying Tiger becomes a great control line stunt model! It even has optional wing flaps! Or if you're an R/C modeler looking for some­ thing to keep you on your toes - this is it! Talk about per­ formance - you've never seen such fast rolls and tight loops! K it has huge decal sheet w ith authentic insignia and mark­ ings, many carefully shaped and die-cut balsa and plywood

parts, adjustable threaded pushrod and quality nylon fittings, I CARL GOLDBERG MODELS. INC. etc. Large, exceptionally complete plans show every step, I 4736 W. Chicago Ave., Chicago, IL 60651 every detail, and various options so you can build the P-40 I I am sending 25c! tor 8 pg illustrated ^ ■ Catalog with Basic Explanation of R/C | you want! Fly the Flying Tiger! * Equipment and Radio Control Definitions i or best service, see your dealer. If not available, A V A IL A B L E I Name _ I 77 te direct: add 50d per item ($1.00 ou tside U.S.). IN CA N A D A I J Address I CARL GOLDBERG MODELS INC. I C ity ------I I 4736 WEST CHICAGO AVE.· CHICAGO, ILLINOIS 60651 State. Zip . J APRIL 1976 WHEN CONTACTING ADVERTISERS, TE LL’EM MODEL BUILDER SENT YOU! 63 are), the West-ner will fly free flight. In Write For FREE BROCHURE reality, I use the rudder to interupt the flights. This is essentially a free flight On Our Complete Line Of model with radio control used to keep the model inside the perimeter of the R/C PROPORTIONAL EQUIPMENT flying site. (And that’s really what it's including all about! wen) A word of caution, a full tank will WORLD'S SMALLEST SUPERLIGHT get this little dude gosh awful high. I use 2 to 3cc for about a 50 second motor DIGITAL CONTROL SYSTEMS run. Park your “ West-ner” in a thermal SMALLEST SIZES LOWEST PRICES and have a ball! One last thought: Is a 60% "Wester­ 13400-26 Saticoy Street ner” a mid-westerner? At least a guy should hyphenate the name! · North Hollywood, Calif. 91605 Phone (213) 764-1488 Guardian...... Continued from page 35 leadout mechanism is not clear, I would suggest that you refer to some of the recent articles on stunt designs, as about FLY H00Ktm 99 percent of the recent models employ adjustable leadouts. Brass tubing was used for leadout guides on the originals. The only light, ad­ About 1 ounce of tip weight was also justable tow hook used. Sand wing to final shape with guaranteed agai nst 320 and 400 sandpaper. col 1 apse or breakage The fuselage is cut from 1/2 inch TYRO PLAYBOY SR. 80" SPAN C-Grain balsa. The motor mounts and Old Timer R/C or F/F. Completely pre-cut. plywood doublers are epoxied in place. Formed wire landing gear. Stressed for R/C. $1.75 postpai d (Az . The hook mounting is simply a short Meets all Old Timer requirements. res. add 5% tax) piece of 3/8 x 1/2 motor mount stock S39.95 — (Plus SI .50 postage) epoxied into the location shown on the California residents add 6% tax. GLIDER GUIDERS plans. The fuselage should now be carved to shape (roughly an egg shape), TYRO MODEL & SUPPLY 1400 Valley Bank Center the plywood edges rounded, and the P.O.Box 11511, Palo Alto, Ca. 94306 Phoenix, Arizona 85073 tail end narrowed from a point behind Phone: (415) 321-2898 the elevator control horn to about 1/8 inch thickness. Do not thin out the sealed and looks like 20 coats done the with foam. area in which the stabilizer is to be old way. Use Polyester resin to protect The windows are glazed from the mounted. front end from fuel. inside, using cement to hold to the The rudder, stab and elevators are After clear doping, the trim colors perimeter. The windshield can be now cut out and shaped to an airfoil are added, using vinyl electricians tape shaped by taping into position, then section. I like to install the control for masking tape. Two coats o f clear are warming with a hair-dryer until the horn in the elevators before putting in applied to the joints to minimize leak­ plastic just begins to buckle. Repeat the hinges. This seems to help me get age, then color coats are brushed on. until the plastic stays in place without Vinyl trim tape was used to delineate help, then cement into place. Complete things lined up easier. It should also be noted that the control horn is not the joints. assembly by installing motor, wheels, The rudder is hinged now, since the etc. Add weight, if needed, to get the centered between the elevators, but is offset to the outboard side. After danger of getting dope into the joint is center of gravity where it is marked. over. I used white carpet thread in a Beware a tail heavy model! installing the hinges, the entire hori­ figure-eight pattern. The radio gear FLYING zontal tail surface can be sanded to should be rechecked for absolute free­ What’s to tell you? If balanced at the remove any small errors due to align­ dom with no binds as per Ace instruc­ center of gravity shown, and no warps ment. tion book. Install receiver and battery are present (steam them out if there The torsion rod for the kickover rudder is formed from 1/64 music wire. Remember that the angles o f the bends you put in this rod determine the MOVING TO SOUTHERN CALIFORNIA? amount of movement you will have. We generally use about 20 degrees of rudder movement. The sub-rudders (or MAKE SURE YOU GET A HOME whatever they are called on the Guardian) WITH A MODEL WORKSHOP ! ! are cut from 3/32 balsa. I like to attach FOR ALL YOUR REAL ESTATE NEEDS. CONTACT: them to the stab before assembly to the ANITA NORTHROP fuselage. Assembly is simply gluing the pieces together. I use epoxy for all wing-to- SPECIALIZING IN: (714) 979-1050 fuselage joints and for the stab and RESIDENTIAL (714) 538-9625 rudder-to-fuselage joints. Care should COMMERCIAL Office at: be taken to insure accurate alignment INDUSTRIAL 688 W. Baker St., of parts. Note . . . there is a little LAND Costa Mesa, Ca., 92626 negative incidence in the wing. This should help a little on the top end without decreasing low speed perfor- 64 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER mance. The tailskid is installed by cutting grooves in the fuselage as shown on the plans, bending the wire accordingly, and then epoxying the wire into the fuselage. The slot in the wing for the pushrod HOBBYPOXY going to the elevators should be large enough to prevent binding and then the equal-opportunity finish faired over with a balsa cover. The Some people seem to think that epoxy paints are suitable only for R/C gadget that holds the rudder in neutral models. Not so! We don't know how this myth got started, but we're for the high speed portion o f the flight here to tell you that HOBBYPOXY epoxy paints are terrific for any is simply a piece of 3/32 O.D. brass type of model. Let's look at the requirements: tubing onto which a spring has been soldered, and a piece of 1/32 music wire (to catch the hook) is then bent and control line soldered to the spring. Sufficient wire If you fly stunt what you need is light weight for performance, high is left sticking out of the top to insure gloss for appearance, and toughness to last through hundreds of prac­ catching the rudder. Allow at least a tice and official flights. Hobbypoxy gives you all three. 1. Because of 1/4 inch o f the wire to show when the its terrific coverage, a Hobbypoxy finish requires fewer coats, w ith the spring is depressed by the raising of the result that the completed job weighs less than dope. 2. Nothing beats a hook. To install this gadget in the Hobbypoxy finish for high gloss. Unless you're extremely fussy, you fuselage, first drill a hole from the don't even need to rub it out. 3. Hobbypoxy is the toughest and most bottom to the top at the location shown flexible epoxy paint available. You'll never have cracking or peeling on the plans. Then, with a Dremel tool, problems, even after years of competition. enlarge the bottom portion o f this hole If you fly one of the speed or racing events, you know how impor­ to clear the spring. The assembly can tant a slick, shiny, fuel-proof finish is. That's why top-notch competi­ then be installed into the fuselage with tors use Hobbypoxy. Hobbypoxy isn't brittle and resists the hottest epoxy. The top of the brass tubing racing fuels. It'll take the abuse of Rat Racing, Team Racing and Carrier should be flush with the surface o f the better than any finish on the market. (As for Combat, a Hobbypoxy fairing between the elevators. Make sure finish will definitely outlast the model!) the portion o f the wire bent to catch the hook is long enough. free flight All fillets are made from Sig Epoxy- Yes, Hobbypoxy is great for free flight too. Normally you'll use dope lite putty. This material should be to adhere and taughten the tissue or silk, but then you should definitely mixed according to directions, smeared consider the advantages of a top coat of Hobbypoxy Clear. One sprayed on the area involved, and shaped with a coat of Hobbypoxy will give you far better fuel protection than six moistened finger. Almost perfect fillets coats of dope, with less weight added. Also, multiple coats of dope can can be made in this manner, and only a cause warp problems .. . but because Hobbypoxy doesn't shrink, it small amount of wet-sanding will be doesn't warp. If your wing was true when you sprayed (or brushed) the required for finishing. Care should be Hobbypoxy, it'll stay true when the Hobbypoxy is completely cured. taken to fair in all joints. Those sharp As for rubber jobs, even if you don't use Hobbypoxy as a finish, you changes in shape can cause a lot o f drag. should still try it for coating the inside of a rolled-sheet motor tube. For finishing, I paint the fuselage It'll toughen the wood, and is completely impervious to rubber lube. and tail surfaces, and Monokote the It's also great as a finish on prop blades, for the same reasons. wing. First, mask o ff at least a 1/2 inch So there you have it. Whatever you build, you'll build it better with of the planking in the center section of Hobbypoxy . . . the equal opportunity finish. the wing to provide a place to stick the Monokote. Apply two coats o f Sig Be sure to send for a copy of our “ Hobbypoxy Painting Pointers" brochure, plus the new 1976 color card. They're free! Lite-Coat dope to the surface of the fuselage and tail surfaces. Sand smooth. A Division of Pettit Paint Co., Inc. I then apply three coats of Sig sanding 10 Pine Street, Rockaway, N J. 07866 sealer and sand very carefully to remove HOBBYPOXY PRODUCTS most of this material, as it is quite heavy. Finish sand with 400 sandpaper. Fill scratches and dinks with “ stu ff” or landing gear clamps. I have also used soldered to the elevator pushrod (under­ spackling putty. Set the plane aside for aluminum landing gears. neath the stab) and run through a short about a week for curing and then spray piece of brass tubing for a bearing. This two coats o f Super Poxy on the fuselage The engine is then mounted and the bearing is epoxied to the fuselage side. and tail surfaces. To prepare for the stub pushrod joined to the throttle with Monokote, finish sand with 400 sand­ a Quick Link. The stub pushrod from A loop is then soldered to the hook of paper, carefully blow o ff all sanding the bellcrank is joined to the elevators a length appropriate to hold up the dust, and then go over the wing surface using a coupler from Quick Link. The hook and to provide enough upward with a tack rag to remove any foreign hook is bent to fit and a horn soldered movement of the spring on the rudder material. About the only hints I can onto the hook to work the aileron. A holder to engage the rudder and main­ give on applying Monokote is to make spacer is generally necessary on the out­ tain it in a neutral position. The wire sure you do not iron in any wrinkles board side o f the fuselage to provide which holds up the hook is then trimmed around the edges when ironing it down. working space for the horn. The horn so that a certain amount of down elevator Shrink with a heat gun. is connected to the aileron control horn will release the hook. Additionally, two I usually start the final assembly by by use of aileron connectors commonly small hooks are fixed to the hook and to putting on the landing gear. The gear is used in RC and a pushrod with two the fuselage to hold a rubber band. The made in two pieces and joined together Quick Links. One end must be fixed to rubber band provides tension to hold in the center with a piece of brass tubing. prevent the pushrod from making its own the hook in the down position and to The gear is held in place with K & B adjustments. A short pushrod is then activate the aileron. APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 65 The Guardian will certainly furnish you with a good start toward enjoying this enjoyable event. I have had more fun flying these planes than probably any that I own, yet I have won less. $)>■ A^o tto co u p e The closeness of the event makes it one 3 A* WlNfiSRAX. 0 2 0 * » * WING VAX. 04* ROWER FOR RADIO CONTROL OR TREE FUBMT t t B ‘ WIN«VAN »OR RUBBER. C02. of the best we have. I hope you enjoy row RMMO CONTROL UR TO THREE CHANNELS OR 0*0 ROWER A «IT OR NOSTALGIA ONE OR THE «OLDEN ERA'S ORCATEST AIRCRAFT ANO A 0CLI4HT TO BUILD your Guardian as much as I have. # A WSTORT MAKER BEFORE WORLD WAR It HM A M E R IC A N * C/L ...... Continued from page 37 BKLUNCA “ S i * f Ilf k rl “ Falcon Spl. are unavailable, but Kils- donk will sell copies of the up-dated φ P/PCR CUB drawings for $2.50 per set (includes WINOSRAN, 04« POWER. FOR RADIO CONTROL UP TO THREE 34* WiNOSPAN. 020 POWER FOR FREE CHANNELS A TRUE CLASSIC ΑΛ- handling and first class postage), if you CRAFT FROM THE \tOLOEN ERA* FUBMT OR RADIO CONTROL. PLANS ONLY \pS\J S3 WINOSRAN. 020 POWER. FOR S2-00 would like to build a good-flying and PULSE ANO SMALL MULTI-RADIO ««·» CONTROL UNITS CAN BE RLOWN FREE FLIBHT ON fast design for this year. Contact John POWER OR RUBBER on direct orders aoo io x for pacrum and S * «3 POSTAOt VA RESIDENTS ADD 4% TAX FLY LINE MODELS at: 16159 Old Bedford Rd., Northville, •SEE YOUR LOCAL HOBBY DEALER· 10643 ASHBY PL FAIRFAX.VA 22030 Michigan 48167. * * * I’ve recently been playing around with a 35mm wonder-of-wonders, as COVERUP! you can see from some o f the close-ups of one of my Slow Combat planes. The Sturdy, dark green vinyl covered pics show my method o f attaching land­ binders for your valued copies of ing gear to a Slow. The wire leg is of MODEL BUILDER. Gold logo. 3/32 piano wire, which is rigid enough if the gear leg is kept as short as possible. 6 RUBBER SCALE PLANS Two 3/32 dia. holes need to be drilled COMPLETE PLANS SHOW ALL PARTS. in the fuselage, which, in my planes, is BOTH W INGS. FULL STAB. PRO P BLANK. the aft end o f the maple motor mounts. SCALE SOURCE REFERENCES The gear is plugged into one o f these 20 Folkerts SK-2. 20 Crosby CR-4, 13" Chambermaid, 13' Folkerts SK-2. holes and a No. 6 x 3/4 sheet metal l3'Fk>yd Bean, 16'Smirnoff Bearcat screw goes into the other and holds the S e t $ 5 0 0 Postpaid Foreign add $159 whole mess on. This type o f gear is very order from: CIOUDBUSTER VENTURE easy to make, light, and it works! Also, TO. Box 2921 Livonia, Michigan 48150 the gear is easy to take off, if need be, DEALERS INQUIRIES INVITED for packing planes into a car. A first-hand quote from the Col.: “ I 25 two-minute runs. I start flying on am working on a new design for Fast K & B 100 and gradually work my way Combat. I t ’ll make a Nemesis look like a up to K & B 1000. Some are running Ringmaster.” Honest, folks, that’s what hotter fuel, but 1 can have enough he said! Howard went on to mumble Only $4.95 each, two for $8.95, or trouble with this combination. We have about some “ interesting” airfoils he had three for $12.95, postpaid in the US. tried various 9 x 6, 9 x 7 and 9 x 8 come across, flaps (maybe), and full ad­ Canada and Mexico add 30 cents per props. My choice is a Rev-Up Pro Series justability of flying characteristics for binder. Overseas add 50 cents each. 9 x 7 clipped to about 8-1/2 inch sure. I let Howard mumble to a stop and California residents add 6% sales tax. diameter. The tank is a 2 ounce Veco then tried to get some specifics out of converted to Uniflow. him about the new design. Nothing. All NOTE: One binder holds 1971 and 1972. For 1973 to present, one binder per year. Flying is the real important part of he would say is that it will be harder to profile carrier. The competition is close build than a Nemesis, but a bunch easier MODELS' and every little thing counts. The to fly. Also, no suggestion as to when potential top speed of most planes in the new design will be flying, other than BUILDER this area is within 3 to 4 mph of each he will have it ready for the ’76 Nats. Box 4336, Santa Ana, Calif. 92702 other. One of the common mistakes is The Col. is basically a little weird, but to take o ff too steeply. A smooth, level knows his stuff when it comes to Com­ A workable table of weights should takeoff is worth 3 to 4 mph. Other bat and the designing o f good Combat go something like this: Completed wing than this, just hang on and hope your planes. It is going to be very interesting should weigh about 4 ounces, the fuse­ combination of motor, prop, fuel and to see what he comes up with. lage 4 ounces, the rudder, stab and plane will give you an acceptable top * * * elevators 1 ounce, and the assembled end. In the Feb. column I let Arlie Pres- structure about 10 ounces. The finished The low speed is the real fun part. It zler tell about his Sig P-51 Stunter and plane should weigh 24 to 26 ounces. is usually described as flying on the edge the mods he made to it. Arlie promised of disaster. The best approach seems to to let us know how the plane turned out We have used Supertigre engines be to get the plane in a nose-high, semi- and here it is, straight out o f his very almost exclusively, especially since the stalled attitude and then fly with the good newsletter, the Headwind. stock engine rule. I am still using an throttle. Practice is the real key to low ” THE CONTINUING SAGA OF old Supcrtigre Stunt RC, although most speed. I generally goof o ff most o f the THE SIG P-51: I left o ff last time talk­ people are using Supertigre Combats. winter and then, when the time comes to ing about the techniques I used to A careful, and long, break-in is required get serious, I feel lucky to get 23 to 24 lighten the kit airplane. Well, it seemed on these engines for best performance. mph. However, after just a few flights, to be turning out pretty good · .about I use K & B 100 fuel with added lubra- I am usually under 20 mph and then into 33 oz. without finish, but with every­ cin, and a 9 x 6 prop clipped to 7 inch the 18-19 mph bracket. The work really thing else including 3/4 ounce of tip diameter. The run-in consists of at least begins when you try to go slower. weight. Since it was coming along so

66 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER Λ RADIO CONTROL I WACO S.R.E MODU

SPAN: 56'V LENGTH: 45 3/32" ENGINE 40 to 60 SCALE: 1 5/8” 1 FT

Its hard to lind words to describe the breath­ equipment and scale detail, (it can also be phase ot construction. Formed Landing taking beauty and great flight performance built for control line). It's truly a joy to fly Gear. Alum. Engine Mounts. Giant Scale of this graceful and beautiful cabin bi-plane and likewise just to look at, whether on the Decals. Linkage Hardware includes of the "Golden Thirties". If you're an R/C ground or in the air. The kit’s a real dandy Pushrods. Aileron & Elevator Horns. flyer, whether Sport or Scale, then you are too . . . top grade-density selected balsa, Bellcranks. Clevis. Connectors, etc. . . also bound to fall in love with this magnificient sanded to micrometer tolerance. Die cut & Plastic Cowl with molded-in-place dummy aircraft. Beautifully engineered for ease of numbered parts make assembly swift and engine cylinder. Wheel Pants, and much assembly and long-lasting ruggedness: the sure as you follow the detailed step-by-step m o re . . . Waco S.R.E. has loads of room for R/C plans and instructions that cover every

1 » EACH KIT MAKES 2 MODELS 2 1 Ni Peanut Scale Balsa and Tissue Construction. Parts printed on fine quality balsa wood, density selected and sanded to micrometer tolerance-Strip Balsa. Colored Tissue. Scale Decals. Wheels, Propellers, Fittings, Contest grade Rubber Loops. Light-Strong Detailed Scale Plastic Parts-Clear-easy to follow step-by-step drawings and instructions- both models are fine flyers if built according to plan.

Peanut Scale models are rubber powered flying models scaled from real aircraft. Span is strictly limited to 13" and they may be llown indoors or outdoors. Sterling "Peanuts’' are fun to build and fun to fly. Designed by experts, they are remark­ SE 5«S FOKKER 0 8 ably realistic in appearance and are great flyers. All material required is in the kit tor both models except glue & dope (paint). In addition you need pliers, straight pins, hammer, tweezers, single edge razor blade.flat building board. Saran Wrap (or similar). RUBBER MOTOR WINDER

STERLING MODELS · 3620 G* ST. PHILA. PA. 19134 If no dealer available, direct order« accepted — with 10% additional charge for handling and »hipping. (60C minimum In U.S., $1.25 minimum outside U.S.) □ Catalog of entire line of airplane control line model kits. R/C scale and Trainer kits, boat model kits, accessories, etc. 50« enclosed. □ “Secrets of Model Airplane Building". Including design, construction finishing, flying, adjusting, control systems, etc. 25« Jlng prefl soloing, stunting. Carrier rules and regulations. Carrier flying hints and control line Installation instructions 25« enclosed. A MUST FOR RUBBER POWER MODELERS Ro checks. Or.ly U.S. money orders or currency accepted. Molded of tough virgin Nylon 'his five to one ratio Name _ winder Is a must for long flights and competition r \ n r endurance. Compact and efficient, the Sterling έ , . Ό Ό Address _ -C ity . -S ta te . -Zip - Winder Is just perfect for models using up to three loops (6 strands) rubber motor. power than most Fox 35’s. Combat planes using this handle. It is “ I get lots of compliments on how heavier than the usual E-Z-Just, which I good it looks .. I painted it gold with thought would bother me, but it is a black and white trim after an Air Racer bunch lighter than some Custom han­ that flew at Reno a few years ago. The dles I've seen. But the C.S.C. handle is air racer was wrecked when the pilot so comfortable that I have yet to worry tried to do aerobatics with it at another about the excess weight it has, com­ air show .. I hope that is not an omen pared to what I’m used to. In fact, the for my model. first time I used the handle, I forgot I “ My airplane ‘hunts' in level flight, K even had a handle in my hand, until, so this week I get the ‘pleasure’ of sand­ after the flight was over, somebody ing my leading edges still blunter, and 1 asked how I liked it. I couldn’t answer ugh, refinishing them. I won’t blame the the question, the handle felt so nice and hunting on the design, though .. it com­ comfortable that I completely forgot 60 IS A L IT T L E BIG ??? es from having no slop at all in the ele­ about it! With any other kind of handle, vator control, and from not making the I am constantly aware o f it and contin­ THEN TRY TIMS NEW elevator even thicker. Overall, I am ually shifting my grip (holding it like a FOX 40BB pleased with my airplane, and I ’m sure bear, letting it slip to the tips o f my it will end up being competitive. It fingers, etc.) in an effort at getting just would probably turn out to be a 48 or the right feel on the handle. The Fox 40BB has all tin· things you want 50 ounce brick if built out of the box In addition to being comfortable to plus some you haven’t thought about. by anyone who is not a Stunt Freak .. fly with, the C.S.C. handle features in­ Schneurle Porting. What do you think, Dirty Dan? I wish 2 Ball Bearings on Main flight adjustment. Get the adjustment in Cylinder · Unique 9 port design. Sig had kitted a 575 square inch version the ball-park before take-off and then Carbo m inded for long wear. of a ‘Stiletto,’ or a ‘Genesis,’ or a ‘Stunt simply dial it in to where you want it Piston Aluminum with tree ring. Machine,' or a ‘Mirage,’ or a ‘Quasar,’ while you are flying. I’ve waited out Super sturdy c onstruction and ad infinitum . It sure is pretty, many a flight with a Stunt plane just so though!” I could readjust my handle. And you’re FOX 40BBRC 24100 59.95 To answer Arlie’s question .. I don’t! not even sure it will be right the second FOX MOTOR MOUNT 50404 4 50 I have no idea how much my P-51 time up. No problem with this handle, FOX PROP EXTENSION 90413 2 25 weighs, although it doesn’t seem to feel you can change adjustment at any time. FOX SPINNER 60308 9 00 very heavy, and flies OK. Next time I ’m FOX TUNED MUFFLER 90302 19 95 I often have trouble getting my inverted at Don Shultz’s house, I’ll weigh the flight down and in the groove, so I ad­ plane I built so we can see if it really is FOX MANUFACTURING COMPANY just my handle with the plane inverted Γ>30Κ Towson Ave. / Fort Smith. Ark 72901 as heavy as Arlie claims it must be. and flying. Once I get it right in this As to the kits Arlie suggests, Midwest position, I’ve got it where I want it for has already agreed to kit the Genesis, all the other maneuvers. and M&P should have already (by the Only very rarely do I make an un­ well, I decided to blow some weight for time you read this) released their kit of qualified recommendation of anything, the sake of durability. I covered the the Stiletto 35. This plane was designed but this is one o f those times. Get your­ entire nose section back past the wing by Les McDonald, who has a second self one o f these handles, you won’t re­ leading edge with 4 oz. fiberglass cloth (1975) and a third (1974) in the Nats, gret it. Write to: Control Specialities and resin. I then put a K&BSuperpoxy plus a spot on the FAI team, using this Company, 205 Wood Ave., P.O. Box finish on the whole airplane, after seal­ design. Price of M&P’s Stiletto is just 268, Middlesex, New Jersey 08846. Or ing it with a coat of polyester resin under S30.00. The first 200 kits arc sup­ call (201) 469-1663 and ask for “ Stunt” wiped dry upon application. After posed to have some exceptional wood, Hunt. Ooops, forgot to tell you that the ending up with a 1/2 oz. of additional so check with your favorite shop; they C.S.C. handle goes for $9.95 plus 50c tip weight and an added ounce to the may have just what you’ve been looking for postage. A very reasonable price for nose, my Mustang now weighs the for in a Stunt ship. what you get, and the handle is even * * * amount stated on the box .. 41 ounces. guaranteed for one year. That's 12.4 ounces per square foot, Bob “ Stunt” Hunt sent along one of GET THE LEAD OUT . .. FRONT! which is still competitive, and the Veco his new Stunt handles, and it is really Continuing along with my campaign • 19BB does a good job o f hauling the neat! I've been using it for a month or to educate C/L fliers about existing freight around .. to me, it has more so now and have flown both Stunt and R/C-related accessories that they should 68 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER be aware of and using, let’s look at sev­ eral from Prather Products. The prop balancer has always been good, but has just recently been redesigned slightly, so DU-BRO that it is usable on any prop I can think of. This is probably the best prop bal­ “SNAP-ON” ancer available. I better quick get in something about lead, as that was my lead-in for this bit! When trimming out any kind of plane, B A L L L I N K S nose weight is occasionally required, and it is a real problem finding a good nnj-LTJ-tTUU u L I ■ — place for it. The best place is way up » U front, of course, and if you use Prather’s 11 Iffl nose weights, you can put them on the ______1 (2-56 THREADED COUPLER INCL) front of the engine, as they replace the BOLT-ON LINK prop washer. Neat, huh? The nose This 3-piece ball link set (No. 180) weights are available in 1/2, 1, 1-1/2, is a m ust fo r all helicopters and is and 2 oz. sizes, so one of them out to be readily adaptable for rudder, elevator just right. Also available from Prather is and servo linkage on R/C planes, stick-on weight. This stuff is lead, and boats or cars. Ball joint action eliminates binding and is neat and comes in adhesive backed strips. The clean in appearance. Only 85 4 sticks are marked in I/4 and 1/2 oz. in­ crements so you can tell how much THREADED FOR 4-40 ROD OR BOLT weight you are adding. The adhesive is • TOUGH NYLON LINK SNAPS-ON strong, allowing you to simply paste the AND HOLDS TIGHT weight on any convenient place. I use the stick-on weights to trim a plane at the field, and then bury any weight re­ quired in the structure when I get home THREADED LINK 5-Piece ball link set (No. 181) is and can do it right. ♦ * * excellent for off-set steering, throttle and servo hookups. From “ Patty’s Pinkie,” a very good Includes steel ball assembly with newsletter out of Southern California, I 2-56 thread, washer, nut, threaded coupler and nylon ball link. see that )ed Kusik and Larry jo lly are Easily adjustable. Only 854 gettin’ it on in preparation for the up­ AIRCRAFT QUALITY HIGH STRENGTH STEEL coming World Champs. January 11, in the first of a series of Ten Kilometer 1/8" TRIM ADJUSTMENT races for FAI TR and Badyears, Kusik/ ^ T ake Jolly turned 100 laps in 4:15.8 and 200 rH R O T T L E S laps in 8:27.7 to win at both distances. HOOK-UPS RIVET LINK EAS Y I Jed says they are going 97 mph in traf­ 4-Piece ball link set (No. 182) fic and getting 43 laps with a front in­ for those who prefer a permanent take Rossi diesel. So they are putting installation. Includes nylon link, this motor away, saving it for the W/C’s, threaded coupler, steel ball with pin and washer for peening on. and are looking for a couple more. Absolutely no linkage play when Seems that exceptional TR motors are ball links are used. Nylon link hard to come by. I wish them luck in helps reduce viabration and looks finding some good back-ups! good too! Only 854 * * * As mentioned in a previous column, the various advisory committees to the AILERON CONNECTOR & DUAL Control Line Contest Board have really made a difference in the quality of CLCB decisions. Now the advisory com­ TAKE-OFF BALL LINK, mittees have had some time to work to­ 5-Piece set (No. 183) includes 2-way nylon link, 2 threaded couplers. gether, getting a feel for the best way to 1 steel ball with pin and washer proceed on matters like rules, interpre­ for peening assembly securely tations, etc. And they are now starting onto servo arm. For fast equal to get together proposals for the next trim adjustments just "snap-off" rules cycle. A proposal made by the nylon link, twist in desired direction and "snap" back on. Racing Advisory Committee, for in­ EASY! Also great for rudder - stance, will demand much more consid­ nosewheel and elevator-brake eration than one from Joe Nobody in hookups. Only $1 .00 Somewhere, No Place. John Kilsdonk is chairman of the RAC. He recently sent a copy of the RAC “ shopping list” for new rules, and I want you to take a look at it. 'DU-BRO PRODUCTS' 1: Provide a unified set o f Racing rules. INCORPORATED 2: A .40 size Goodyear or Scale 480 Bonner Road Wauconda, Illinois 60084 U.S.A. Race: 2-1/4 inch scale, profile, 1 inch APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 69 a fte r night. Kilsdonk’s address was stated earlier in this column. I am sure that the chairman o f the other advisory What kind of covering committees are moving along with pro­ posals for their various events, but none o f them do as good a job as Kilsdonk in do you prefer? keeping me posted. Hint, h int!!! The names and addresses of all the chairmen o f the advisory committees TISSUE? If you like tissue, we recommend Silkspun Coverite. It looks like tissue but it's 10 times stronger, and goes on with a household iron, in half the time. It were listed in this column in the Jan. can be used as is (the filler coat is built in) or painted, requiring one-third the paint. 1976 issue. Contact them about your It's very economical. SILK? If you like silk, we recommend Super Coverite that can favorite event. Again, give them your be easily ironed-on. It looks like silk, but it's 100 times stronger. Like Silkspun, it views, but don’t demand an answer. can be used as is or painted. Being a woven fabric, it's very authentic. MYLAR? If * * * you hate to paint, but are tired of the way plastic film mylar scratches, sags, rips and shatters, we recommend iron-on PermaGloss Coverite. It comes with 4 coats of By now you may have had a chance special paint bonded permanently to its upper surface. Paint that won't scratch, is to look over the new AMA rule book, fuelproof, rotproof and fadeproof. It is 150 times stronger than mylar, tissue, silk and if you happen to be a Carrier flier, or anything else. ONLY COVERITE COVERINGS MEET THESE RIGID TESTS: you have possibly noticed that scoring Shrink Test: With household iron, shrinks drum tight, wrinkle free (even around o f Carrier has changed considerably. compound curves). Will not sag like plastic mylar films, nylon, tissue or silk because Coverite has a permanent shrink memory, but will not warp airplane structure. You guys who are used to going for lots Abrasion Test: Withstood 3600 cycles on Taber abrader (500 gram load). Sunlight of top-end, better check your bag of Test: 6 months under glass exposure in Florida sun, retained 4X more original tensil tricks for a hand-full of bottom-end if and tear strength than silk. Temperature Test: Withstood up to 400 F. Did not you want to keep on winning. Oh yes, become brittle at below freezing temperatures like plastic films. Chemical Test: Virtually impervious to engine fuels. Humidity Test: Resists water which causes practice those landings until you never oth er coverings to swell and sag. Rot and Mildew Test: Buried in soil 8 weeks miss! without change. Strength Test: Far in excess of 25,000 PSI tensile strength. To illustrate my point, I am going to COVERITE IS EASIEST TO APPLY 1) Requires no lift info from Rog Edwards article, as fancy tack irons; ordinary household iron is fine. 2) New improved Quickstik adhesive surface sticks printed in “ Patty’s Pinkie,” Vol. Ill, No. tighter than ever when properly heated. 3) Requires 1. minimal sanding. Hides far more defects than any “ How effective is low speed in the other covering. 4) Requires no pre-doping of new scoring system? This can best be structure. 5) Takes less paint due to built-in filler coat. But all Coverite coverings can be answered by comparing different com­ used as is, without any paint vtfiatsoever. binations o f high and low speeds under PermaGloss, however, has 4 coats of the two scoring systems. Some examples almost indestructible paint bonded to its are given in the following table: upper surface. 6) Requires no special handling. Won't scratch or burn up dur­ ing application. 7) Can be trimmed with OLD paint, any decal including mylar, or with itself (which is goofproof because it can be Class I and II re-heated again and again). High Low Score

120 30 390 JJJaJ 115 25 385 110 20 380

JJJJ iJilJJ Profile Carrier

80 20 260 Δ Ji/ J J J J J 77.5 17.5 257.5 75 15 255 2779 Philmont Ave., Huntingdon Valley, Pa. 19006, USA NEW

Class 1 and II

High Low Score wing, .018 lines, .40 engines, no restric­ ing more pit-stops to de-emphasize tions on engines, 70 and 140 lap races, speed. Alternate would be to require 120 30 160 otherwise the same as present 15 Scale more pit-stops with no fuel limit. 115 25 161 110 20 165 Race. John put out the above list to gene­

3: Ban all exhaust extensions in Rac­ rate some feed-back. How about giving Profile Carrier ing Events. No megaphones, tuned it to him, so he can do as good a job as pipes, mini-pipes. possible for you? 80 20 120 4: Ban internally connected lines. One suggestion, though, john surely 77 .5 17.5 121.8 (Require 125 lb. cable or 1/32 wire) doesn’t have the time to answer a whole 75 15 125 5: Scale Race line size increase. pile o f letters, so how about simply giv­ 6: One ounce tank lim it on Scale ing him your views concerning the “ It is obvious that a contestant who Racers. Or require more pit-stops. above and anything else that is on your flies 5 mph slower on both his high and 7: Approved line construction tech­ mind? If you state your case clearly the low speeds would lose under the old nique. first time and without making him have system and w in under the new scoring 8: Allow pressurized engines in Slow to answer your letter to figure out what system. The effectiveness o f low speed Rat. Possibly restrict venturi area to you’re saying, John can keep your views compared with high speed under the old lim it speed. in mind when finalizing RAC proposals, system was that an increase in high 9: Lim it fuel tank size in Rat, requir­ without tieing himself to a typer night speed was 1.33 times more effective on 70 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER * ___ -X The Kraft System* engineering group pioneered the concept of digital proportional control and Subsequently created the innovations *. 7 6 : responsible for the level of R/C. performance CONCEPT **** accepted as standard today. Its not" surprising, therefore,that the neu> Kraft line represents Retractable antenna. a. major advance in the state of the art- Spin buttons, roll buttons, and Additionally, because the neui crystal filter I.F. receiver rate switches are available does not have to be tuned to its tvunsmitter, complete at extra cost on special interchangeability is obtained and Component rather than order or may be added System merchandising is made possible.. la+er

To utilise this advantage, component» have -Spring loaded been priced so that there is little price penalty buddy box in purchasing individual components over the. toggle system price. For Convenience, components are ^ .S w itch individually packaged and the purchaser to r may select items to custom tailor a ^ ^ reliability System to his preference.

Some of the features of our ĎiceriTennial Series are shown here.

Triple use meter reads RF and transmitter battery voltage and also automatically convert» to read receiver battery voltage. It has ojn electronically expanded scale Easily for accuracy. a ju s ta b le stitk lengths

new tw o-axis open gimbal stick. assemblies are of the WighesT quality yet produced. This design eliminates any possibility of centering error and has excellent feel to satisfy the most demanding

A new open gimbal single stick, version is available at no extra cost. KPT-7C5

Plug-in transmitter and KPR- 7C receiver modules provide ______K l I 5 3 .H 0 0 1 # instant change between New solid state crystal filter I.F. the /7 standard R/C receiver makes possible plug-in frequencies. frequency modules and provides improved Selectivity for belter rejection of s+rona adjacent channel interference, fln advanced design dual conversion plug-in receiver is available. at eVtra cost.

Cable interconnects battery test circuity in transmitter to receiver charge jack.. Receiver battery is tested under load. TC r a f t JL· SYSTEMS. INC. -in conversion to optional trainer switch

Snap-on frequency designation plates.

Super-precision open gimbal sticks as used for entire, lin e . Wire- * wound Control potentiometers are used for superior lineuritp

Plug -in transmitter Rf. modules CXre accessible by removing "transmitter loach..

All models feature plug-in modular encoders as uiell as R.F, sections to provide stand a r distortion -for im proved cjuodity e_nd -faster service..

Solid state crystal Vilter I.F. receiver eliminates the requirement for alignment; th ereb y permitting the addition of air borne pacKages on the same, or different -freguencies by the purchi of off-the-shelf receivers. While-this receiver does hot have the plug-in R.F modale, its price is Sufficiently modest to permit the cuSTomer to add a different frequency receiver to his system for greater flexibility. T h e lis t p r ic e -for t h e plug-in RF. Section for the transm itter combined untVi anew receiver is only-^7*/, 90

Note·' I f plug-m frequency conversion isdesvred with the K.P-5C, the KPR-7C receiver may be substituted at a slight extra cost. Our neuu 3 channel systern offers greater utility than previous models because of KPT-3C the neu> control stick conf igura-tion.

Despite price ad vantages, troublesome, unreliable dry batteries ha./e been e lim in a te d end ocH system s now include recharge o- ble trans m'itter and receiver nickel cadmium polaks with ekarter.

I he transmitter has plug-in R.F. modules» accessible by removing transmitter back.

The left-hand stick may be mounted vertically or horizontally and may be either self-neutrali zing or position able with brake. For glider enthusiasts this permits rudder on the left stick, u/ith Super-precision open gim bal (Xileron and elevator on the right· stick. stick. Vertical axis may be Self-neutralizing or positionable Stick configuration can be easily with fine tooth ratchet. changed by owner.

integrated circuit decoder and servo amplifiers are now standard. K P R -3 C All new mechanics are smaller, stronger, and feature the rugged KPS-ITIT gear tram . internal reversing plug matches chanrTeT~ O utput to desired control stick, confíguratťon. One 550 ΠΑΗ battery pack and tu>o compact lightweight tso MAH battery packs a re optionally available fo suit a_ wide range of installation requirements. For high current drain application,a 1,000 MAH heavy- Four servo mechanics are optionally duty pack is available available to suit individual at e x tra cost. K β - W F preference. All feature oar exclusive integrated circuit Servo amplifier -for unequaled ,DIRECT SERVO CONTROLLER accuracy, smoothness, and efficiency. Special high torque and high speed servos are also pel X K B - 4!;n K B -4 S available at extra, cost.

Rugs into charge jack of switch harness perm itting operation of throttle and retractable landing gear without interfering u/itVi others or being i nterfe red with. ά-η indispensable, accessory -for crowded Flying Fields KPS-/ WRITE FOR FREE CATALOG-

* 450 WEST CALIFORNIA AVENUE \ tfPS-12 RAFT RO.BOX 1268-VISTA,CALIFORNIA 92083 SYSTEMS, INC. KS y World’s Largest Manufacturer of Proportional R/C Equipment does not always idle very reliably). The new system should allow more engine/ STRIPING TAPES airplane combinations to be competi­ tive. In addition, because of the low SUPER STRIPE GLIDER STRIPE speed emphasis, larger and easier-to-fly THIS NEW ULTRA THIN TAPE HAS THIS TAPE WAS DESIGNED FOR models should emerge. A novice to the FANTASTIC CONTOUR ABILITY AND NON FUEL PROOF APPLICATION. Carrier events has an easier opportunity WILLCURE ON YOUR FINISH FOR A IT HAS GREAT CONTOURABILITY FUEL RESISTANT ACCENT OR TRIM AND ADHESION AT LOW COST. now to become competitive.” Thanks to Patty for re-printing that BOTH TAPES COME IN: RED · WHITE · BLUE »ORANGE »YELLOW OR BLACK. article and to Rog for writing it. Flow SIZES 1 /1 6 " 3 /3 2 " 1 /8 " 1 /4 " 1 /1 6 " 3 /3 2 " 1 /8 " 1 /4 " PRICES about somebody in the Albuquerque PER 1 0 8 " .69 .89 .99 $1 .09 I 1 0 8 " .49 .59 .69 .89 Thunderbirds seeing that I get your ROLL 3 0 ' $1.49 1.59 1.99 2.79 ' 3 6 ' .99 1.19 1.49 1.89 newsletter? Remember a few months ago when I Trim RON'S RON'S com pensator suggested that Carrier flights take a VÄRAGOLD sheet long, hard look at Perry fuel pump/carb Beautiful wildly colored sets? With the changes to Carrier scoring designs and letters. in mind, one has to give very serious Polyester TOW HOOK V irtu a lly m ounted consideration to them now. unbreakable. variegated A stock K&B (used to be Veco) .61 gold leaf. R/C has pretty good power, right? By \ simply bolting on a Perry pumper and carb, this engine will put out approxi­ A djustable Simply cut out $1.89 ea. up to 1-1/2" mately 20% more power, will be less af­ 5 " x l 5 " $1.99 ea. and stick on. fected by variations in fuel head or tank If not available at your dealer, send check re­ Distributor/Dealer All items postage paid. or money order to: J.L. Wittman Co., location, and will still idle slow and inquiries invited. Calif, res. add 6% tax. P.O. Box 2857, Laguna Hills, Ca. 92653 liably. Sound good, so far? There is more. Check out Clarence Lee’s column in the CHICKEN HAWK Feb. ’76 issue of RCM, page 10. Perry has come up with some trick porting for engines like the K&B 61. It is called o k a See* S udyet Perry Directional Porting (PDP), and it has been patented. Addition of PDP to a K&B 61 is supposed to be good for an M IS T E R E additional 500 rpm at the least, with some engines picking up 1,000 rpm. Super! K&B is selling both its 61 R/C and .15-.23 the very popular 40 R/C with the Perry 1-2 Ch. All die cut parts, formed pump/carb factory installed, so your dural gear. Simple Construction. dealer probably has a very competitive Proven Performer $15.95 The Gentle Intro to Multi All die Class I or II engine right there on the cut, formed gear, aileron material. shelf! The K&B 61 sells for $109.95 and Another easy-to-build kit $29.95 S pecia l ScUtioM . “Ρ Ι λ μ α the 40 for $89.50. Not cheap, o f course, See your dealer or order direct. P O Bo. 2SSS. Sck.n.cUdy. N. Y. 12309 but when was the last time you saw a competitive engine go for peanuts? If you want to try a pump/carb the score than a similar decrease in low typical percentages have been calculated combo on something other than a K&B, speed. In other words, an increase in and are summarized in the following here is a list o f the engines for which high speed by 1 mph was worth 4 points table: Perry is making pumpers: O.S. Max; and a decrease in low speed of 1 mph Schnuerle 60F-SR, Goldhead-Blackhead was worth 3 points. Under the new Old New and the 40. Supertigre; 51-56-60 ST system, the relative effectiveness of Class I & II 30% 45% series, G 60 and the G 40. Webra; Black­ changing high and low speeds varies de­ head 60 and Speed 60. K&B; Veco 61 Profile 22% 40% pending upon the low speed. For ex­ and Front Rotor 40. OPS; 60 R/C. ample, in Class I and II, for a high speed “ These results show that the landing Kraft; 61 R/C. of 110 and a low speed o f 25, reducing points under the new system become The pumps and carbs are sold sepa­ the low speed would be 1.3 times more very important. The reason for this is rately, but are to be used in sets, of effective than increasing the high speed. that under new system, the overall mag­ course. Price o f a pump is $23.95 and For a Profile Carrier with a high speed nitude of the speed score has been cut the carbs go for $ 16.95. of 75 and a low speed of 15, reducing in half. Thus making the landing points When I first realized that the Perry the low speed would be 2.0 times more twice as important as under the old pumpers would be available separately, I effective than increasing the high speed! system. On this basis, one can no longer started thinking about using one, in con­ It is apparent that the lower the low afford to lose 5 or 10 points on landing, junction with a regular needle assembly, speed is, the more effective it becomes without jeopardizing the chance to win. on a Stunt engine. It may sound strange in increasing the score. “ In summary, under the new system at first thought, but I think it would “ Flow do the landing points compare of scoring, low speed flying skill and work great. Tank location would no with the speed points in the new sys­ landing skill are much more important. longer be a problem, for sure. Turns out tem? The landing points vary between 0 Some of the edge is taken o ff the high that one o f our local Stunt Freaks is and 100, where 100 is for a perfect performance racing engine because a thinking along the same lines and is landing. To make a comparison of how good, reliable low speed idle is now very going to try it out with either an O.S. heavy the landing points weigh, some necessary (A highly tuned Racing engine 40 or an ST 40. Neither of these engines 74 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER is very popular in Stunt, evidently be­ cause they don’t “ suck” too well! The pumper will take care of that little pro­ blem. I have been asked to not say who is trying out the above combination, so I can’t tell you that it is Don Shultz. . . Too bad ..I’m sure that a lot of you would be interested in hearing what tricks D o n S h u ltz is up to now. Maybe in a future column I can let the word out. * * * A couple of weeks ago, I pulled one of my favorite tricks on a guy and thought maybe you would like to hear about it. I was at the R/C field in Port­ put more sting in your engine land, Ore. Lee Wyman and his wife were out flying and Lee was getting ready to The most-wanted glow plug line in the GloBee’s secret is the plugs’ unique design fly one o f his R/C helicopters, a Heli- model industry is now available at better (patent pending) featuring superior high- Baby. I waited until Lee was ready to dealers everywhere. Here is the plug re­ temperature glass seals and a flat-wound fire it up and then stepped over and sponsible for: spiral glow element positioned closer to asked, “ Hey Lee, who’s the better chop­ * top finishes in every local, national, and the fuel for quicker ignition and increased per flier, you or Ernie Ware?” (Ernie is world meet where it has been flown RPM. Try the GloBee racing, R/C or sport another Portland ‘chopper’ flier, and * a revolutionary new standard of engine models on your next flight. You'll see, hear he’s good.) Lee didn’t say much, but I performance and feel the difference a GloBee can make. knew I’d planted an idea in his mind, * a de-limiting factor in engine design and You'll discover why they are preferred by and he proceeded to put in a really modification. the nation's best flye rs. . . and why they super exhibition of flying skill... Users report faster, more reliable starts... are being called “ the plug of champions." extremely low, high speed passes, con­ smoother idle and transition through the trolled hovering any place he wanted it, power ranges, greater stamina and longer the whole shot. If you want to see an life . . . a dependable flight every time! impressive flight, you only have to ask, but you have to know h o w to do it and w h o to ask in the first place! ( N o w y o u know how he got his knickname, ",Dirty D a n ." w en) Larry Wilson, a N.W. Combat Freak, used to pull much the same thing at the DIVISION OF EMERSON ELECTRIC CO. C/L circles. With a Combat match be­ 6000 Fernview Ave., Cincinnati, Ohio 45212 tween two of Larry’s buddies in the offing, he would casually walk up to each of them and inform each o f the others intentions to “ cut your booms off” . Now neither flier was considering doing this, but Larry made them think that the other was out to do him in, but good! These matches were always great crowd-pleasers, with both guys going for the other’s booms and almost always ended in a great, splattering mid-air. See what I mean? If you want action, you ask for it, but you do it very subtly, and with the flawless timing that only constant practice can bring! * * * for engines was considered, but we big planes don’t usually handle too well Lots of talk goin’ round about Rat decided that we don’t need it in this at the speeds we’ll be running (around and what to do with it. Here in the area. 120 at first, maybe the high 120’s after N.W., we have finally settled on a some development), but that is nothing couple of Rat events to try in the next N.W.S.R. is, admittedly, what you serious. year or two. We have decided that re­ call a "turkey event," but we wanted it gular AMA Rat is as good as gone for us, simple and easy. Although the planes Last month we ran out of space be­ the interest just isn’t there anymore. So are going to be big and slow, we are fore telling you about the N.W. Re­ we have decided to go with two new, looking for lots of participation and gionals and what to expect if you come slower Rat events. The first will be al­ close racing, and that, folks is where it ’s up for it. Just today I got a newsletter most exactly the same event I described all at. from Mike Hazel, of the Eugene Prop in the January column on page 84. It For an event that will be fast enough Spinners, and here is what he says: will be called N.W. Sport Race, and, to to be satisfying, allow the pros some "A t the time of this writing, the san­ refresh your memory, will feature kit choice of airplane design, yet not be out ction form for the 7 6 N.W. C/L Region­ planes only (a list of 26 legal planes is of the reach of the novice, we have als is being made out. Date is May 29th part of the rules), plain-bearing engines, decided to simply adopt AMA Slow and 30th. As always, we will put on a minimum 2-1/4 inch wheel, no shutoffs, Rat, but to allow pressure feed. The quality meet containing just about every fast-fills or hot-gloves. The claiming rule only potential problem with this is that control line event there is. Here is the APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 75 NEW. TEMPERATURE COMPENSATED NYROD A ROD FOR ALL SEASONS

NEW 8 METAL ROD IS PERFECT FOR THESE INSTALLATIONS - BEND AS NECESSARY NYROD inner tubing

NYROD outer tubing NEW! 8” METAL ROD SU-PR-KLEVIS • I I 0 II

Plug Sparks. . Continued from page 21 from Micro Models, P.O. Box 1273-A, idea o f the original event was to be able Covina, Ca. 91722, for a stamped, ad­ to fly a left hand circular pattern for dressed envelope. one minute and then, on the next flight, Sam fu rth e r states that these a right hand pattern for one minute. In sketches will accompany all future kits the recent event staged, the emphasis for those that want to fly competitively was on the attainment o f a 60 second in the O/T F/F radio assist events. The flight from the 60 second mark. No re­ columnist can’t praise Sam Blumberg quirement was made to be able to fly in too highly for his conscientious efforts either direction. to make sure the buyer o f the kit is Some events have been staged by the made fully aware o f SAM regulations BOLT ON A 2b°'o POWER INCREASE SCAMPS that are quite similar, notably and that he will have no problems in qualifying. AND BE QUIET TOO! a three-minute limit contest held about a year ago. However, this event could EAST COAST TEXACO EVENT? Tests show a Fox Muffler increases power promote an international postal contest, According to Carmen Boltecello, while lowering noise level at no increase in as the emphasis is on precision (a true Editor of SAM 7 Chapter newsletter, fuel consumption. sport event) rather then being subject to "Yankee Flyer." President Al Vollmer Construction Features: weather conditions that determine the has proposed a fuel-allotment event be Chamber machined from solid bar, integral held very similar to the Dawn Patrol as fins cool and stop wall resonance. length of the flight. All parts buffed to high luster. In a quickie run down of the rules, originated by Sal Taibe of the SCAMPS. here is what John Haggart had devised According to Carmen, the event (dif­ 60 size supplied with cast adapter and machined to fit most popular motors. for this Bowden Event. All models must fering from Texaco) would allow any R.O.G., with a flight time of 60 seconds old timer design to fly on 1/8 ounce per 40 size supplied with adapter for FOX 40 pound of weight up to a maximum of and FOX 4f> motors. as the goal. Three flights with a maxi­ mum score of 180 determines the win­ 7/8 of an ounce. The intriguing title of Other adapters available soon. ner. The other miscellaneous rules are “ Yankee Yawn Patrol” would be the Be the first on your field to sport this classy quite similar to the present SAM rules, caption o f this eastern contest. new look. and will not be repeated. One interest­ Before all eastern flyers say the heck Note - These mufflers meet all ΛΜΛ require­ ing feature is the ruling that the model with getting that early, remember, at ments for sport and pattern flying. must land in sight of the timer. Don't the Canadian Nationals, the Unlimited 40 SIZE M UFFLER »90302 *19.95 get any near-sighted timers, men! Rubber Event was flown by automobile 60 SIZE MUFFLER »90303 *24.95 According to Pete Fisher, the next headlights at 6:00 a.m., with dawn at FOX MANUFACTURING COMPANY Bowden Event will be held on August 8, 6:15. The turnout was surprisingly 5305 Towson Ave. / Ft. Smith, Ark. 72901 1976 at the old Warden Aerodrome good. The best part about retrieving (Shuttleworth Collection). All are wel­ was that the timers went with the con­ come to compete. How about taking testant, hence, preventing loss when one line-up: All classes of Carrier, Goodyear, your next vacation to England and par­ lost sight of the model. We’ll keep you N.W. Sport Race, N.W. Slow Rat, AMA ticipating? Should be a real fun day! informed on developments, if and when Rat, Scale, Stunt, Fast and Slow Com­ KIT CHANGES it comes off. bat, and most all classes of Speed. And Received an interesting call from MISS TIN Y COWLS for the Speed events we don’t have, Sam Blumberg of Micro Models, who is While we are handing all the hints on there will be a "catch-all” Record Ratio producing the reduced versions of the how-to-do-it items, S.H. Law, a doctor for them." Mercury and Miss America designs. In o f the U.S. Hospital Service on Staten Official entry forms and more infor­ his advertisment, he claimed full con­ Island, New York, offers a real great mation will be available the first of formance to all SAM rules. idea for those hard-to-find aluminum March from Mike Hazel, 738 West "M ” However, he found that his sheet ele­ cowls for models like the Miss Tiny, Pa­ Street, Springfield, Ore. 97477. vator and rudders are unacceptable cific Ace, Ohloson Pacemaker, et al. Next month I ’ll turn ya on to Arlie under present rules and has since incor­ The hosing manufacturer that mar­ Preszler’s super-stooge, which is just porated a change in his kits showing the kets its hose under the name of LEGGS dandy for gettin’ it off on grass .. Hey! option o f built-up tails. For those who provides an excellent ready-made shape Watch what you read into my stuff. The have purchased kits showing sheet tails that can be easily modified to the re­ preceding simply means that Arlie’s only, illustrations showing the changes quired size. These egg-shaped forms are stooge is not designed for use on necessary to conform to the letter of within an 1/8 inch or closer in diameter pavement! · the law, according to SAM, are available to the desired nose size. By cutting out 76 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER HOT NEW KIT RELEASESCtů/ 320W#/2A-A .049 .051 $12.95 450W«A-B-F.A.I .15 .23 $ 2 1 .5 0 _W 788W#B-C-D .29/.4I $ 25.°°*PK *PRO-KIT ClMO STRAIGHT W OOD 'IScU cC tU c

AT YOUR HOBBY DEALER, OR DIRECT ARLETA, CAUFORN.\AN91331

for the engine at the top, these finished his right mind would convict him!). cowls can be easily sprung in place. Best Between the free flighters, R/Cers, ADJUSTABLE SERVO ARM part of all, they come with a ready­ and rubber band boys, a thoroughly en­ made indent on the inside! joyable time was had by a ll.. with the Might also mention that putting a exception o f President Al Heilman, who small 1/4 inch diameter hole in the bot­ proceeded to reduce Flying Quakers to ? tom will help drain the surplus oil and kit form quicker than “ Fast Richard” fuel, hence keeping the inside neat and can produce 'em! dirt-free. SAM 21 FUN CONTESTS (IN JANUARY?) Not to be outdone by the free flight­ About this time of the year, this ers, the SAM 21 Boys staged a formal column starts getting a provincial look meet at the Santa Teresa Hills,· featuring as the only meets being held are out a Fuel Allotment Event (1/8 ounce fuel west. With the AMPS, SCIFS, and per pound of model). With all models SCAMPS (not to mention SAM 21) in conforming to 0 /T SAM rules being al­ California, along with the VAMPS in lowed to enter, fifteen official entrants This accessory will permit you to preset Nevada, and the Southwest F/F Annual were noted. the required arm length to match any in January, most of the action is here. Temperature got up to 60 degrees, throttle or control surface movement (What else, with temperatures ranging and it was then the old man (Pond) that is desired. We now mfg. this from 55 to 75!) spotted a thermal good for eleven min­ accessory to fit the following servos. The AMPS have released their sche­ utes, to beat the lead man at that time, Order by Stock No. dule along w ith the SCIFS and Ed Wood. About one o’clock in the .984 «ach SCAMPS. What a beautiful arrangment afternoon, a breeze came up, and with o f contests! With each club putting on Stk. No. 33 - fits KPS 9 the hill directly in back o f the launch eight to ten competitions a year, there Stk. No. 67 - fits KPS 10 site, the meet degenerated into a slope Stk. No. 44 - fits KPS 11 aren’t many free weekends! This doesn’t soaring event, with every flight getting Stk. No. 45 - fits KPS 12 take into account the annuals staged by progressively longer. Stk. No. 46 - fits KPS 14 & 15 the San Valeers, San Diego Orbiteers, Stk. No. 47 - fits World Eng. etc., that feature old time events on a Finally, at 2:50, the boys hollared Stk. No. 48 - fits D&R big scale. quits and Vern Schultz brought his Miss Stk. No. 56 - fits EK Servo AMPS 0 /T RUBBER Philly VI down after 29 minutes. It Stk. No. 64 - fits KPS 14 & 15 II would probably have been going yet! Probably the biggest thing to come Add .254 on direct orders. out of the AMPS Annual Meeting was Had to smile at Loren Schmidt, as he let the adoption o f the 36 inch Cabin Com- his model get on the downwind side of ROCKET CITY SPECIALTIES merical Event as so successfully initiated the hill after 13 minutes. It was a long 103 Wholesale Ave., N.E. by the SCAMPS. Of course, the AMPS hike over that hill, but fortunately, the Huntsville, Ala. 35811 had to have a contest immediately, on model free flighted quite well in the February 8, featuring this "new” rubber downdraft, getting only the usual holes event. Well, it rained, believe it or not, from weeds and rocks. With no crashes Birds...... Continued from page 10 to speak of (except for Don Bekins’ so the contest had to be resecheduled feather bends and twists automatically for the 15th. For the benefit of the east­ tearing the wing o ff his .020 R/C Re­ plica Stratostreak), the contestants had and simultaneously. erners, California has been suffering a Going back to the inverted U-shape drought with accompanying beautiful a great day, thanks to the efforts o f Tom Bristol, SAM 21 Prexy. of the gull wing for a moment, it occurs weather for modelers. The last time it to me that shear stresses play a part in rained was 44 days ago! WRAPUP nature’s design. If you can imagine hold­ SCIF FUN FLY With all this talk about the genera­ ing an extremely long stack of paper As quoted from the “ Flight Plug", a tion gap and how the young ones are cards parallel to the floor merely by large group o f can’t-wait-for-the-next- supposed to take over, the columnist pressing them together between your two contest types turned up at the SCIF spotted the best sign he has seen yet. hands, it is quite obvious that a simple Jan. 25 meet at Taft. Weather was gor­ “OLD AGE AND TREACHERY WILL push from the side or the top (shear geous, with clear skies, 70 degree tem­ TRIUMPH OVER YOUTH AND SKILL." stress) would send them scattering. If you could take that stack and bend it into a peratures, and a very mild wind (After Couldn’t have said it better myself! · that, if an easterner shot me, no judge in U-shape or inverted U-shape, and still APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 77 arm humerus (forearm bone) and a thick extensor (muscle). The step is recessed Greatest Book of furthest at the elbow. The flexors at the FULL-SIZE RUBBER FLYING airfoil nose are thinnest for land soaring SCALE PLANS, plus birds, but are more strongly developed and thickly feathered for the ornithop- building, trim m ing, and SCALE MODELS ters (flapping wing birds). The upper arm, flying instructions ever forearm and flexor form a triangle cov­ published! OF WW/I ered by the leading edge skin. By way of contrast, the eagle has an airfoil shape which is very similar to a ]edelsky wing Twelve half-inch scale © © structure, and somewhat thicker in sec­ rubber powered flying tion than the wing of a hawk. Birds with an eagle-type profile are models by some o f the 12 FULL SIZE PLANS best in stroking flight, while those with world's best modelers, • GRUMMAN Mf WILDCAT the hawk profile are superior soarers, • GRUMMAN W KiU.CAT including Doug Mc- •VOUQMT MUCOASAlR being faster, climbing better and soaring • MITSUBIP4I ZfRO • HAWKI* MURRtCAMf I more efficiently in thermals. It is interest­ Hard, Clarence Mather, • Surf HMtftiM criTfiRf • MOKMCHMCT fll 10SC ing to note that the “step" is most Bill Hannan, Bill War­ • KKIMIDU TA tn • ■ELL 70· AlAACOeBA pronounced on birds which have the •cmmatMoc ner, Bob Peck and • •■470 TNUMDilWOlT highest aspect ratio and wing loa din g.. • •«1« MUST AMO sea soarers such as the kite. Kites are gulls others. • COVfRIMe AMO TRlMMINQ • MAKING IT ELY which always attack eagles at play, and, • •UtLDtfM ANO 7INISHIN0 in spite o f its higher wing loading, climbs faster and turns tighter. The kite has a Compiled and pro­ FEATURE ARTICLES ON duced by I.E. Coleman, ALL 1/24 SCALE BUILDING, FINISHING, AND measured sinking velocity o f 1.7 feet per 11/2“· 1*) FLIGHT ADJUSTMENTS. second at a forward velocity of 28 feet edited and published per second, yielding an L/D of nearly 17 by Model Builder Ma­ AVAILABLE NOW - $7” to 1! This is remarkable, even foran R/C gazine. sailplane. SEE YOUR HOBBY DEALER, OR ORDER In spite o f all of its advantages, the DIRECT. ADD $1.25 FOR FIRST CLASS. hawk airfoil is said to be gust sensitive, CALIFORNIA RESIDENTS ADD 6% SALES TAX. noisy in flight and tends to “ buck” , a FLYING term which means that it appears to Box 4336, abruptly lose its efficienty at times. Santa Ana, Ca. 92702 Either this is a momentary stall, or it may SCALE MODELS be an instance of the wing making an abrupt transition from laminar to tur­ Pilcher in England, and many others, bulent flow. I would like to see an R/C were trying to fly. They built hang sailplane modeler try the hawk profile gliders, and because they lacked man­ sometime, step and all. You might even made aircraft data, they turned to the attack an eagle at pla y.. and get away birds for ideas. Their “contraptions” with it! I'd try something else, however, seem primitive by our present knowl­ first before taking on an eagle . . because you can’t flap! Day: 635-8147 edge, but were they on the wrong track A/C (318) Night: 861-2790 after all? For example, they all used thin, The pattern of feathers on the wing is curved airfoils which turn out to have interesting, being somewhat overlapped REPLACEMENT ROTOR BLADES very low drag and which are greatly and running at an angle to the chord line. Jet Ranger superior to present thick airfoils at low This may be a measure to increase tor­ Reynolds Numbers. X-pert .. . $11.50 sional stiffness. Each feather also has a Regular . . 10.50 Experiments in Germany in the early series of tiny ridges or roughness on its 1940’s (F.W. Schmitz, et al) showed that surface. These are at an even greater for R.N. below about 100,000, the cam­ inclination to the direction of airflow, GULF-SOUTH AERO MODELS bered plate 417A airfoil was superior to and are believed to turbulate the flow to 5603 WEST CANAL any other tested. Recently, Eric Lister improve airfoil efficiency at low R.N. A t SHREVEPORT, LA. 71108 has proposed very thin airfoils based on high angles o f attack in the soaring mode, the meanline curves of more familiar a row of feathers along the leading edge manage to hold it in the manner as thicker airfoils. Structurally, it is not easy pops up, acting as anti-stall slats or flow before, the shear stresses would be met to build a thin wing adequately strong to straighteners. When hawks are observed everywhere and the cards could not be support large spans, because there is not “ bucking” inflight, it may be these feat­ easily pushed apart from any direction. enough thickness for the spar depth hers rising and falling automatically as The gull wing may utilize its shape to help required. B u t.. it just may be possible to required to keep him at maximum lift with shear forces too. use an external spar system. In the world coefficien t wi th out stal ling. AERODYNAMICS of hawks for example, there appears to be Owls have the most silent flight of any The farther I go with this, the shakier a workable compromise between struc­ bird of prey, and their wings are covered becomes the ground I walk on! Let’s see tural and aerodynamic requirements. For with tiny, soft “ downy” feathers which where it leads us, and if I’m wrong, the greater portion o f its chord length, ruffle in the slightest breath o f air. I f it is someone out there will let me know. This the hawk's wing is quite thin. On the true that noisy flight is “ draggy ” and that is a kinder fate than having nature itself lower surface, behind a thin, steeply silent flight is low drag, then the owls prove me wrong in the most direct curved “ nose” portion, there is a "step” much have the lowest dragof any species. manner possible., a crash! In the late which is also found on the stork, crane As far as I know, drag and glide measure­ 1800’s, Otto Lilienthal in Germany, Oc­ and flamingo; all o f which are excellent ments have not been made (or at least tave Chanute in the United States, Percy soarers. Behind this step lies the upper reported) on any o f the owl species. 78 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER Inasmuch as owls fly and hunt after dark, that may explain why aerodynamicists HIRTENBERGER - AUSTRIA have not studied them. I’ve heard, how­ ever, that some engineers and aero- physicists are night owls, so perhaps that isn’t the reason, after all. In any case, HP 6 1 FS supporting data would be very worth­ while, I should think. SPECIAL Sea birds have been seen to "sw im ” underwater by using their wings. The r gannet is an example of this peculiar behavior, and swims after diving into the water from altitude in pursuit o f a fish .. should he miss the fish in the first instance. The bodies of sea soarers are some­ what slimmer (fineness ratio) than are the bodies of land soarers. This may be because o f the lower drag of a slim body which improves the L/D and penetration for slope soaringat relatively high speeds, but would have little effect at lower, thermal soaring speeds. Perhaps gull bodies are slimmer also because they swim in the water, both in and on the surface. It is always a pleasure to watch the body of a gull in flight, because it seems to undulate and streamline itself into the airflow, scarcely ever being motionless. These movements are even greater in flapping flight and great amounts of “ body english" can be obser­ ved under these conditions. Strangely, I ’ve not noticed the body movements in hawks to the same degree as in gulls. If anyone can explain this, I’ll be interested $129.95 (Silencer and G low Plug not Included) to hear from them. Maybe I just haven’t observed carefully enough; but that’s my • SCHNEURIE PORTING WITH EXTRA LARGE BYPASS PORTS · FORGED PISTON · impression, anyway. It is no doubt true, FORGED CONNECTING ROD WITH BRONZE BUSHINGS · HEAVY DUTY CRANK- that sailplane modelers may never be able SHAFT WITH DOUBLE BALL BEARINGS · SINGLE PISTON RING · STEEL SLEEVE · to duplicate this body movement on their NEW TYPE THROTTLE WITH LOW FRICTION BARREL MOVEMENT · LOCKED IDLE sailplanes in any case, so investigation of MIXTURE CONTROL · SPECIAL EXPANSION CHAMBER SILENCER WITH PRESSURE it may not be productive of any useful TAP AVAILABLE ($20.00) · TUNED PIPE SILENCER AND R/C MIXTURE CONTROL information. The bodies of soaring birds AVAILABLE · REAR ROTOR RACING VERSION AVAILABLE · MOUNTING DIMEN­ SIONS SAME AS WEBRA 61 SPEED · PERRY PUMP AND THROTTLE AVAILABLE (USE are long enough so that at any soaring UNIT FOR WEBRA 61 SPEEDI speed they are likely to use, the Reynolds Number of the flow over and around DEALERS: STANDARO DISCOUNT AVAILABLE MW 276 . their bodies is likely to be supercritical, and the flow lam inar., at least during AVAILABLE AT YOUR FAVORITE DEALER soaring. Γο be continued. * MIDWEST MODEL

Hannan...... Continued from page 45 S U P P L Y C O . first place in the Golden Gate Trophy 6929 W 59th St. Chicago. Illinois 60636 312-566-7101 event, and second in the Thompson. By 1939, it flew its final race in the HANDY HINT PLUS A FEW NEW of thinned-out SIG Litecoat clear dope, Thompson, placing third. The craft has PRODUCTS then rub on a piece of colored tissue been stored for some 36 years, and is Quite a high percentage of small to match the rest o f your model. When still 95% complete, with only about 40 models call for bond paper covering on dry, the material may be applied in the running hours on its engine. Suitable such parts as cowlings. In some cases, same manner as bond paper. Result: for restoration to flight status or as a a section cut from the plan itself, serves No need to shrink or dope with color, truly rare museum specimen, the the purpose, or as an alternative, ordin­ as well as a savings in weight. Marcoux-Bromberg deserves attention. ary white typing paper has been And speaking of Vintage Aero, Phil Serious inquiries may be directed to employed. The objective o f using paper, reports release of a new autogyro kit Mr. Profant at the above address. of course, is to more nearly simulate of his own design. Rather like an R.O.G., PONDER THIS . .. metal or plywood covering of the real the kit model features a two-bladed Fed up with the high cost o f model machine, as contrasted with the sag- rotor, tractor propeller, and small fixed engine glo fuel? Perhaps this will ease between-stringers effect of fabric. wings with turned-up tips. The sheet- your pain, by comparison: According Phil Koopman, o f Vintage Aero, puts wood parts are printed in color, and to a recent issue of AIR INTERNA­ forth this suggestion for a lighter substi­ should be a cinch to assemble. Phil TIONAL, the fuel cost for operating a tute. Instead o f using paper, tape a reports altitude flights equivalent in single USAF F-111 fighter is $2,321 per piece of lightweight silkspan to plastic- height to a two-story building, followed hour!!! wrap covered cardboard. Give it a coat by vertical autorotation. APRIL 1976 WHEN CONTACTING ADVERTISERS,TELL ’EM MODEL BUILDER SENT YOU! 79 2ND ANNUAL W orld W ar II BCR.ASVIBIJE sřONsoRED by the PIONEER RC CLUB & b u i l d e r MAGAZINE

3 CATEGORIES FOR RC MOOEl WW 2 AIRCRAFT FLIGHT DEMONSTRATIONS t A M A SCALE

^SPORT SCALE (bom rule»

I SPORT SCALE (NO BOM RULE)

AMA ENGINE and WEIGHT RULES

INFO-PACKET and PRE-REGISTRATION FORM UPON REQUEST!!! Contest Manager Eric Clapp, 6116 Castello Drive, San Jose, CA 95J20 Phone No, (408) 997 2298 C.D. - LOUIS DELATEUR

BEAUTIFUL GRASS FLYING SITE HILL COUNTRY AIR MUSEUM. MORGAN HILL. CALIFORNIA ENTRY FEE: $8.00 PER AIRCRAFT MAY 15-16,1976

Also new from Vintage, is Japanese as Volksplanes and Cougars continue to been reinstated, so Dave has decided to tissue AND rubber with very good multiply. Latest entry in the “ how stick with the present column title. characteristics. The new rubber product simple can you get” derby is a German Perhaps if any of you have "invented” is claimed to have much of the "punch” rig, designed by one Helmut Wilden, that good replacement headings, you could found in a much-lamented old Italian makes a BD-4 look complex! According submit them to Bob Stalick instead? product (Or was it the product of old to a small photograph, sent to the Hangar PROXY PEANUT PHLASH Italians?). The Japanese tissue should be by Dave Stott, the craft consists of a According to Milan Kacha, the Black­ a welcome commodity that many had single tube fuselage joining the empen­ burn monoplane sent from England to feared was gone from the scene forever. nage with a pair of dihedraled wings. MODEL BUILDER’S Peanut Postal event Send $1.00 to Vintage Aero, I The Picture a Sleek Streek with a V-tail, last year, by Butch Hadland, is now Glen, Tenafly, N.J., 07670, for complete plus a seat beneath the wing, and you being proxy-flown by Jiri Kalina in details and prices on these and other pretty well have the idea. Actually, the Czechoslovakia. The tiny machine was offerings. Tell 'em MODEL BUILDER basic concept dates back to 1910, when one of a trio of similar Blackburns sent you! another German, Hans Grade, flew a entered in the MB contest, where it ITALIAN PEANUTS similar machine to win a $10,000 prize. placed third in the Pioneer class. MODELLISTICA magazine has But Grade did it the hard way: He FAREWELL TO ED FRANKLIN recently published full-size fold-out plans designed and constructed his own V-4 The saddest task of any writer has for two Peanut Scale Models, the Ord- air-cooled engine for power! to be presenting eulogies, especially Hume O-H 7 (smacking strongly of Yet another super-simple scale subject when a close friend and fellow modeler Walt Mooney influence), and a Cessna might be the modified Volmer Jensen is involved. Word has reached us that Airmaster. This is the first evidence of hang-glider, shown in another of our Ed Franklin, of Bergenfield, New Jersey, Italian recognition of Peanuts brought photos. The short prop clearance might has passed away, as the result of an to our attention, and we welcome this pose a problem, but probably a Cox .010 industrial accident. Although deeply latest addition to the ever-growing ranks or Brown J. C02 powered version would interested in all phases o f the hobby, Ed work out just fine. of devotees. Perhaps Peanut Scale shall was perhaps best remembered for his one day become an Olympic event! VTO LIVES! participation in “ Old Tim er” activities, Already we have greater international Just as we were preparing to wind up and sometimes flew early vintage designs participation than the Luge, and no this column, we received a frantic note in “ modern” events, just for the fun of aerodynamic helmets are required! from Dave Linstrum, editor of the it! Furthermore, he could be competi­ SIMPLE SCALE MODELS popular VTO column, in Model Airplane tive with such entries. His sense o f model One of the most popular forms of N ew s magazine. Dave had announced a history was particularly strong, and he "gamesmanship” among scale model “ name the column” contest, when it was a lifetime collector, even retaining fliers, is searching for simple-design real looked as though vertical take-offs had the box lid from the first model kit he aircraft to duplicate in miniature. While been drummed out of the AMA rules. ever owned, an Ideal “ Spirit of St. the purists recoil in horror, such “ boxes” But lo and behold, the VTO rule has Louis” . Ed’s philosophy about the 80 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER hobby was one of the most cheerful we ever encountered. To him, the main objectives were to have fun and share it r“ COME FLY with fellow enthusiasts, and that’s exact­ ly the way he operated. WITH ME” Perhaps we could all benefit by care­ ful consideration of Ed’s way of think­ RC HELI’S ing, when we start taking things too seriously. Somehow, it seems altogether Take your pick of any of these too easy to become so wrapped up in beauties (except the one with the legs) . . . and fly as you've our own limited interests that we tend to never flown before. overlook opportunities to ENJOY the hobby, JUST FOR ENJOYMENT'S We’ve built them all . . . we've SAKE. Our sympathy is extended to flown them a ll. . . and we stock them all. So we’re prepared to Ed Franklin’s family, and speaking for tell you about the pleasures of all his many friends, we shall remember flying your own RC Helicopters him fondly. . . . and some of the problems. BILL DAHLGREN REPORTS: We'll help you choose the one “ Entered the kids (and myself) in that’s right for your flight plans Delta Dart and noticed an interesting and your budget. th in g ... the youngest turned in the best We Can Keep You Flying. times, the oldest next, then me . . . I think that there might be a message We stock all the parts for all here, but I ’m not sure I intend to figure these models (and more). . . so . MODELER HOBBY SHOP out what it is.” · if anything does go wrong, you’re never grounded for long. 995 North McLean Avenue, Elgin, Illinois 60120 Phone (312) 697-3737 F /F ...... Continued from page 53 V ______y

you guys who have been flying free WACO ATO · GULFHAWK ΙΑ·0-43Α flight for the past 15 years or more. As X EASY FOR KIDS a Wakefield for its time, it had no peers, CO TAKES 8 to 80 co "Cf 9 ° PUNISHMENT and I would venture to say that it could in A SCALE 00& — 01 still hold its own in contemporary con­ r • X VERY > ® STABLE testing. Guess its name and you'll re­ PLANS < ceive a nice prize from Bill Northrop. *6' WINGSPAN Send him a card or letter as soon as pos­ by WESTBURG m in sible. w m Kit No 110 7 » No. 601 Sia Pock 13 *» APRIL MODEL OF THE MONTH... 30 X 40 DETAILED * O • QcKility boIνα BLACKLINE PRINTS •lightweight dowel IX C illfN T INTRODUCTION SLO-POKE FAI • Formed wire geor INTO RUKDING A HYING' • Color tiisue Charlie Martin is one of the chief • E fficie n t p ro p e lle r, s h a ft A b e a rin g HY IT ANYWHERE SEND S.A.S.E. • Good rubber for power proponents of technical developments • r* FOR COMPLETE • lightweight plastic balloon wheels NEWCOMIRS • Easy to follow plan A pictures NEED SUCCESS in FAI Power here in the N.W. His cor­ * T PRICE LIS T T Ω U l nx* MAUI fOOAT « UHAVAUAJlf O tM l M K T ADO O ' K » W » « t HAMCAMC respondence and visits to notable Power O * ours« us AOO u n II»». fA iA too IV m i WTM i - orp<« «a u w < K * t i o k a . >m fliers throughout the world has allowed c/) O PETER WESTBURG TGRN ACRO CO., inc him to take advantage of the latest in > U- 834 Seventh St. No. 6 < P.O. BOX Θ639Β design theory. These he has assembled Q Santa Monica, Calif. 90403 CHICAGO, ILL., 60666 into his latest ship, The Slo-Poke. As shown in the three-view, it is a high as­ pect ratio, very low pylon design. Climb (one coat). Wing and tail are covered long. is very fast with a half-turn power pat­ with 5/8 oz. per sq. yard material, and The above booms begin in price at tern to engine cut-off, and then a the fuselage with 1.5 oz. per sq. yard. $10.00. For the headaches a ready-made smooth transition to a flat and moder­ All up weight is 745 grams with a total boom can solve, these are a good buy, ately slow glide. Launch angle is critical projected surface area of 572 sq. inches. indeed! for best climb performance, as it is with All in all, a fine looking and performing Keil Kraft Fuse: For those of you most VIT designs. It is fitted with a machine. who have become used to using the slightly modified Kerr engine brake that NEW PRODUCTS AND OTHER small diameter Keil Kraft fuse, the bad stops prop rotation within four revolu­ STUFF FOR FREE FLIGHTERS news is the K.K. has stopped marketing tions after actuation. A Tailboom for all seasons: Mattes this very desireable product. The good C o n s tru c tio n features include a Sales, 3042 Willow Wood Rd., Si. news is that it is still available in Jolly formed sheet balsa fuselage and plug-in Charles, Mo. 63301 presents its new cus­ Old England, in your favorite gas lamp wings. The fuselage has no bulkheads aft tom fiberglass fuselages for practically shop. It goes by the name of Lamp Wick o f the pylon. The wing tongue is a any application. Half-A, A, B/FAI Gas and is actually less expensive and pur­ straight piece of stainless steel five models can now have their own fuselage chasable in much larger quantities than inches long by 1/4 wide and 1/16 thick. booms, as well as Wakefield and Nor­ before. The only problem is finding Brass extrusions buried in the wing dics. From 34.5 inches in length to 51.5 someone in England who would like to panels mate with the tongue and pro­ inches for the gas types, with diameters serve as a broker for this item. In the vide a smooth sliding fit. The fully from 1-3/16 tapering to 7/16 or 1/2 meantime, drop a letter to one o f your cowled Rossi exhausts through a 5/8 inch, all the way up to 1-13/16 tapering English pals and see if he might pick diameter aluminum tube that exits at to 11/16 on the big ones, those booms some of this stuff up for you. the bottom of the fuselage, at about the present a very compatible weight ratio. CLUB SPOTLIGHT: M.A.C.H... .Model trailing edge station. Wakefield booms are available in 22 Airplane Club of Huntsville The ship is covered entirely with inch lengths and in diameters from A recent letter from George Batiuk, glass cloth and squeegeed epoxy resin 1-1/8 to 1-1/4. A/2 booms are 49 inches president of MACH, contained P.R. re-

APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 81 areas. The present system apparently causes the instrument faces to be covered with an oil film and renders them difficult to read. FLY ELM 7. Silkspan or model aircraft tissue will no longer be acceptable as covering for military aircraft. VL-101 Electric propulsion system 8. The use o f sandbags in engine test shown— using Hytork 48 motor and facilities is encouraged. Note that this planetary gear box, Si-3 switch & means bags filled with sand, not straw. charging jack, and B-33L fast charge While straw does make the bags easier to ni-cad flight battery— total weight handle, the Borsk Test Facility has 2Vi oz.— will power models 25 to found them less effective in stopping 50" wingspan weighing up to 10 oz. flying objects. Send 50c for latest catalog showing V L PRODUCTS 9. Parachutes should be packed be­ full line equipment & accessories. Division of Vi9ta Labs Hobby dealers send for information. fore leaving the ground. Attempting to 7023-D Canoga Avenue do it in the air and waiting until the last Canoga Park, California 91303 minute is asking for trouble!” May your flights be long, your ther­ mals strong, and your temperment cool, DUBBER POWERED fEYING MODUS as we enter another season of designing, KITS · PLANS · ACCESSORIES building and flying our favorite form of aeronautical devices.. .Free Flight. See NOW AVAILABLE p tC K PIETENPOL S3.29 you next month. · MILES $3.29 TURBULENT $3.29 PIPER CUB $3.29 F/F Scale . . . . Continued from page 43 ANDREASON $3.49 COUGAR $3 49 member is that the foam will want to MUSTANG $3.49 stick permanently onto your covering ZERO $3.49 unless you remove it as soon as you are SPORT MODEL KITS finished painting. If you are unable to STRINGLESS WONDER $2 49 finish the job in one sitting, and you PECK R O .G $1.39 H A N N A N PLANS -90 TO PICK FROM don’t want to lose your center mark by NEW 76" CATALOG 2S< JAPANESE TISSUE RUB8ER LUBE — HUNGERFORD WHEELS HAND TO UNO ACCESSOHfS KITS AND removing the foam piece, you can leave ALL SIZES OF PLASTIC PROPELLERS HANS fO* NUBBIN řOWttíD MODUS it on and later use naptha to remove it safely. PECK-POLYMERS P. O BOX 2498 MB LA MESA. CALIF 92041 PHONE 17141 446 3164 »· 1714) 469-8675 I like to use enamels for painting let­ tering, markings, etc., even on many heavy introduction to this month’s rubber models. My prime reason for do­ FREE FLIGHT column, I felt that it would be pleasant ing so is that in the event that a goof HARDWARE to end on a lighter note. The following occurs, you can remove the enamel with excerpts from the engineering magazine, synthetic thinner without fear of da­ Design News, was forwarded to me by maging the nitrate finish underneath. I WINDING BALSA A/2 flier, Kevin Collins: might add that the finish underneath has to be thoroughly dry, otherwise the HOOKS STRIPPERS "From : The National Board for Air­ unlimited to peanut »·*’ and ja" lengths synthetic thinner could ruin your over­ craft Improvement all painted surface. Another reason for dETEX· : 1 CIRCLE TØW To: All aircraft manufacturers, re­ ZZVZ using enamel is that it generally covers search facilities and military squadrons quite well, both by brushing and by C0L1PE HUB ’ D T K IT 3iS i Subject: More effective military and RADIAL spraying. Since I use diesels for F/F gas ENGINE MOUNT civilian aircraft construction and utili­ 0 $ 3 704 or only.. .then fuel-proofing isn’t a pro­ CATALOG zation. The following directives are to blem. You don’t want to build up too be implemented immediately to reduce dIM CROCKET REPLICAS much paint while using enamel, because cost, improve efficiency and improve it is more dense than the lacquer type 1448 N. FRUIT AVE. front line readiness: paints. I prefer to use Humbrol paints FRESNO. GA. 93788 1. All funding and research will cease due to the variety o f colors that are on the bullet-proof balloon project. availabile. I use lacquer thinner for the leases as well as some well done pictures 2. Designers shall no longer include solvent when painting with enamel. This from the recent Heart of Dixie F.F. the half-moon cutout on the doors of not only tends to make the paint dry a Championships. This mailout was sent rest room facilities. Recent improve­ little faster, it also cuts down the un­ to all contestants who participated, and ments in literacy have eliminated this natural shine which typifies enamel gives them an indication as to where historic requirement. paints. they placed in the overall contest re­ 3. Concrete will not be used for any sults. The nice feature about this mail­ airframe despite its availability. Floquil has several natural metallic out is that all contestants are listed 4. Wagers shall not be conducted be­ colored paints that are suitable for use down to last place in each event, com­ tween designers within the hearing of on engine cylinders, engine crankcases, plete with scores. And with the large test pilots. radiators (where applicable), gas tanks, turnout, this hopefully will stir forth 5. All pilots are encouraged to raise gas caps, tail-wheel springs, etc. The some souls who passed by this good wheels only after the aircraft is air­ realism achieved using this paint for de­ event. Good luck for next year’s meet, borne. tail work will be quite satisfying. The George. Thanks for the news and the 6. All personnel shall direct efforts use of either Grimmy Black or Engine pix. towards developing a cockpit heating Black is ideal for tires. In fact, the use HUMOR SECTION scheme that will eliminate the need for of this product is quite endless. Because of the rather lengthy and venting exhaust gases into the cockpit * * *

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ASSEMBLED AS SHOWN, LESS Model Racing Products Inc. B O D Y ...... $110.00

Ron Limbrick of Ontario, Canada additional response and comments, I the sweat, toil, and expense add up to a sent in a really super adjustable thrust feel that the majority o f F/F scale usable part. With a model, you simply bearing for use on Peanut models. The modelers around the country DO want cut out another from a sheet o f balsa. In beauty o f this little jewel is that it is to get this organization going full force. essence, I suppose you can say the same hardly noticeable, and it can be easily Therefore, it can be assumed at this with a homebuilt, but the effort to dup­ adjusted when needed. The drawing has time, that there will be such an organi­ licate another part from chrome-moly most o f the detail, but here are a list of zation. Details will be worked out and steel isn’t particularly easy or cheap! instructions that should make this an reported back as soon as they become It is curious to note that the entire easy item to construct. available. This is going to take some assembly is so similar to building a 1: Drill the balsa nose block with a time in order to get every item worked 1/4 inch drill, with 5° to 10° down out to the satisfaction of everyone in­ thrust. (5° seems to work best). terested in joining. There would have to IS IT A STRUT? 2: Thread this hole with a 5/16 be some kind o f assessment in order to IS IT A RUDDER? coarse thread bolt. Naturally, a coarse defray the cost o f printing and mailing 5/16 tap could also be used. some type o f news bulletin, etc. 3: Take a piece of 5/16 hardwood No question about it! There will be a NO. IT'S A STRUDDER! dowel and thread this with a coarse U.S. National Scale F/F Fly-In to be 5/16 nut. Aluminum or nylon could be held in the summer o f ’77, here on the used. West Coast! The dates will be set as 4: Drill this 5/16 dowel with a 3/16 soon as convenient. The month would drill and a 5° angle. probably be either July or August. June 5: Thread the inner hole with a 1/8 in Southern California is typically over­ bolt. Cut a slot for the X-Acto adjuster cast for the entire month. Those who and cut a dowel to 5/16 long overall, or have families wanting to take advantage trim to suit. o f the beach would be disappointed at 6: Cut a slot with a hacksaw in the the lack of rays, but again this will be Peck Polymer nylon thrust bearing. decided at a later date. Please plan for 7: Thread the collar of the bearing this special event. We would like to see by running it through a 1 /8 nut. fellow modelers from all over the U.S. 8: Redrill the bearing with a 1/16 participating in this most unusual type drill angled at 5°. of modeling Fly-In. If any of you are 9: Cut a piece of 1/16 aluminum or interested in helping to plan for this brass tube and insert into the new hole. special event, please let me know. It will $ 2 0 ? 5 10: Screw the 5/16 dowel into the take a tremendous amount of work and balsa nose, then screw the thrust bearing energy to make this successful. FOR MONOS,HYDROS, AND TUNNELS * * * -- IDEAL FOR DEEP VEES. ALL into the dowel. ALUMINUM PARTS ARE EXTRUDED When you have finished, you will On Valentines Day, I had a crew of HIGH STRENGTH ALLOY, RUDDER have an adjustable front end on a Pea­ friends over to help me put the wings on BLADE IS STAINLESS STEEL, HORNS nut model that will give you plenty of my homebuilt biplane Marquard M-S ARE GLASS FILLED PLASTIC. FULLY adjustment without having to use obtru­ ADJUSTABLE FOR TURN AND Charger for the first time. The purpose STRAIGHT AWAY TRIM. BRASS sive-looking shims. Any added weight of this exercise was primarily to deter­ WATER PICK-UP TUBE INCLUDED. will probably be needed anyway. mine the length of flying wires, and also SEND 25* FOR CATALOG * * * to see whether the wing-attach fittings Í0CTURA} QCTURA m o d e l s It has been only a month since I would match the ones on the fuselage .. .also whether or not the “ N” struts f e p G S C ö p P.O. BOX 536 initially commented about starting some I I «loot. »Λ.,.. I PARK RIDGE. kind o f National Scale Organization. would fit. You can’t imagine the con­ ■ L SUPPLIES J ILLINOIS 60068 Even though there is plenty of time for sternation while waiting to see if all of

APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 83 plished by a scaling up of the usual system we use in the sloop rigged boats. TRIDENT II RACING TRIMARAN FOR R/C The myriad o f headsails were made non-overlapping so that they are self- FIRST PLACE IN 1974 AND 1975 36-600 ACCR REGATTAS tacking. In order to generate enough • STYRENE HULLS AND DECKS «SEWN DACRON SAILS »HARDWARE force to take the long hull through the • 36” L.O.A. ·36” BEAM *6.5 LBS. DISPLACEMENT *600 SQ. IN. eye o f the wind while tacking, Lon • COMPLETE PLANS COMPLETE KIT (LESS W IN C H )...... $100.00 found it necessary to fit a rudder with 4 times the area o f the scale one. But SAIL CONTROL WINCH $50.00 since it is underwater while sailing, he CUSTOM R/C DESIGN FOR ALL BOAT SIZES feels that it was worth the departure. A full-page article appeared in National POWER -4 0 IN. LB. Fisherm an about Massasoit in the FAST ------5 SEC. November 1975 issue. In it, the builder VOLTAGE 4.8 - 6V. advised that one should measure the LIGHT ------8 O Z. back o f his stationwagon before laying SMALL - 2"x2"x5" the keel on a too ambitious project. FIRST PLACE With the opening o f the 1976 regatta IN '73 S/B ACCR. season, we are faced with continued '74 36-600 ACCR 8< '75 50 800 ACCR pressure for fair competition at crowded regattas. I ’m coming to the belief that SH EET E X IT 30 boats marks the maximum lim it for G U ID E S - reasonable size. This might consist of 3 S.50 EACH % boats per frequency, with 10 possible Dealer inquiries invited. frequencies. How to decide on which 30 PROBAR DESIGN boats to let compete will be the subject P.O. BOX 639 ESCONDIDO, CA. 92025 of a report by AMYA Director Cas Woodbridge sometime this spring, for he model biplane, with the size being the much o f their time and knowledge. You has collected and collated the experi­ only difference. You have to concern may not have any idea how much fun it ments from last season. But now that yourself with dihedral, proper wing in­ is to build a full-size airplane, or the you have thirty boats, how to treat cidence in both upper and lower wings, amount of valuable information one them fairly? How to arrive at the end and the wing tips must be in equal dis­ gathers from its education aspect. The with the winner being truly the fellow tance from the tail post. I was fortunate wealth o f knowledge garnered should who beat everybody? in having two designees from my EAA help in making better flying scale So far, the best bet is a diabolical chapter who were willing to give so models.. .at least I certainly hope so! patchwork called the Mark 30. This was Note: June 20th is the date for the developed in the winter of 1975, and Flightmasters R.O.W. Scale Contest at has yet to have been improved upon by Sailing Yachts For Lake Elsinore. · 4 different computer types who tried. In Figure 1, is the Mark 30 Heat List. A Radio Control Sailing...... Continued from page 57 square with a slash in it is a heat that is quired for scale appearance. Contrive to sailed by a competitor. let the jibstay carry the whole job of 1. Split the skippers into groups of \ TAHOE 600 supporting the mast in a forward direc­ three according to frequency. Skip­ tion. For in so doing, it will become pers on 53 mHz can be saved till last taut and straight, allowing the jib to set to fill up open holes. Try to fill each with the shape the sailmaker intended. letter (a, b, c ...) completely so that Last in our presentation of scale ef­ letter categories with only one or forts in Lon Hocker’s magnificent Mas- two people are minimized. The bet­ AMYA 36/600 CLASS sasoit. At a scale of 1/3 inch equals 1 ter you are able to do this, the more L E N G TH 3 6 in foot the hull is 74.5 inches LOA and nearly equal the heat sizes will BEAM 9 '/< In carries 14 pounds of lead in the fiber­ remain. SAIL AREA 600 sq In glass shell. Only two channel radio is 2. Make up a 3x5 Card, listing the heats $38.95 presently fitted, and winching is accom­ that each skipper sails. For example,

VALKYRIE AMYA 50/800 CLASS CARR SAILS LENGTH 5 0 In beam 111/, m <74 0*; 7607 GRESHAM ST. SAIL AREA 8 0 0 sq in i r t . V U Complete kits include molded plastic SPRINGFIELD, VA. 22151 hull and components, all rigging, finished STANrV.«: ■ TJ All r ARP SAILS sails and semi-fipished wooden parts. Finest Amerlean-made DACRON sa ilclo th. Vinyl, press-on numerals and Insignia. Heat sealed edges e lim in a te fra y in g . TAHOE SAIL SYSTEM $27.95 Coated,sta 1nless steel llbstay Installed. Rolled-edge grommets In tacK.clew & head. VALKYRIE SAIL SYSTEM $35.95 B o lt-ro p e m a in s '1 lu f f mast attachm ent.

Santa Barbara - $30.00 10-Rater - $30.00 East Coast 12-Meter - 130.00 £0/800(M-class) - $30.00 36/600 - - - - $i?s.oo Internat. A-cIass- 135.00 t W M K m s west Coast l2 -'Je ter - $30.00 Star L5 - 130.00 11715 Adenmoor Ave. Downey, Ca. 90241 Vanguard nJ w-boat - - 1L0.0O T&A Petrel - - $30.00 Scale vessels, special purpose boats, one-of-a-klnds: Write Cali« residents add 6* tax DEALERS WELCOME fo r a quote, and fo r our 1975 Brochure and Used S ails l i s t .

84 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER A2:5-6-8-l1 (Makeup duplicates for as many times as you plan to cycle through the Mark 30.) 3. On regatta day, check in the skippers right on the sheet. If there are no- shows, fill up the holes with skippers from below as frequency will allow. I usually make a list of each entrant and the frequencies he could sail on. 4. At the skipper’s meeting, the skip­ per’s names can be put on the appro­ priate card and he is ready to sail. 5. The racing can be stopped after 6, 9, or 12 heats, with each skipper having sailed an equal number of races. These are good times to update a scoreboard that you have at lakeside. 6. For a one-day event, plan on running through the Mark 30 twice, a two- day event, either 3 or 4 times. Fill out the Mark 30 (Steps 1-4 above) differently for each round. That is, switch frequencies as possible, and never let a skipper be the same letter designation unless absolutely un­ avoidable. (This would be the case of three skippers, each with only one- and-the-same frequency in a 4-round event. But since everybody else would be getting mixed up well, it would not seriously bias the set up.) 7. On the score sheet, the upper left half o f the hash marked square is where you put the score for that heat, the lower right half is where you add that heat score to the pre­ vious score to keep a running cumu­ lative score. 8. We have found it handy to reproduce ( P E Λ Ρ Ο Ο Λ the left-hand column with the skip­ ο ε s i g n e d b y per names and boat numbers on a Tom Protheroe manila cardboard which can be slid along from heat to heat. It makes AMYA book-keeping much easier and helps CLASS to avoid errors. 36/600 9. We also have found that a clip board, with one 8x11 sheet of paper for each heat, is a useful way to keep the actual finishes and protests which FINISH IN FRONT may then be transcribed onto the You will lead the fleet, in any class master score sheet. Often the scoring you race in, when you sail a Leisure tent is some way from the finish line, Products boat. In the East Coast 12 and yelling back and forth is not meter class, our hulls have won more condusive to keeping the skippers trophies than all other manufacturers calm . The Master Score Keeper combined. Our EC/12 kit has all spars, should have nothing to do but enter rigging and fittings, fiberglass hull and the data from the heat finish sheets deck, rudder, detailed instructions and onto the master score sheet. And he Carr ready-to-race sails. It needs only or she should be declared off-lim its R/C gear, sail control unit and ballast. to skipper inquires. Lead the parade to the finish line in a WRITE or CALL 213- 661-7928 The Mark 30 can be improved upon, Leisure Products EC/12. FREE CATALOG $ 2 9 . 9 5 and there is a simple way to analyze a Complete EC/12 meter kit -- $174.50 KIT FEATURES new heat list to see if it is better, ie, to We also have available: • COMPLETE SAIL CONTROL MECHANISM see if it does a better job o f having each F1USON 36 - A ’m ini’ ocean racer • MACHINED WOOD AND METAL PARTS • COMPLETE BASIC HARDWARE PACKAGE skipper meet every other skipper an for competing in AMYA 36/600 class. • ALL RIGGING & A FULL SAIL PLAN equal number o f times. If you have a Full kit (like EC/12, above) - $125.00 • A BASIC COURSE IN SAILING heat list, contact me and let’s see if it is R C SAILPLANES Λ ACCESSORIES YANKEE 50/800 - A lightweight an improvement. The analysis system planing racer (as described in Model AVATAR72 $32.95 CURIO S44.9S was published in the winter 1974 Builder). Sells as a hull/keel/rudder HI-STARTS - PAR ACHUTES - RUBBER AMYA Quarterly Newsletter. semi-kit combination. $55.00 DEALERS Λ DISTRIBUTORS STD. TERM Next month we will present Forest M S LIMITED Godby’s 50/800 design, “ Wind,” and LEISURE PRODUCTS P. O. BOX 3B74B discuss 50/800 hull shapes in general 6920 Braddock Rd., Annandale, Va. 22003 L.A. CA. 90030 APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 85 THE LIBERATORS are here!

MUSEUM SCALE .. . WING SPAN 90 INCHES, FOR FOUR .15 TO .25 ENGINES RETRACTS . . . FOWLER FLAPS . . . BOMB BAYS . . . RETRACTABLE BALL TURRET SEND STAMP FOR DETAILED BROCHURE MOLDED CANOPIES . . . TURRETS .. . COWLS . . . TURBOCHARGERS . .. MACHINE GUNS A N D NEW CATALOG. BALSA CONSTRUCTION . .. FOAM WING . . . FUSELAGE ASSEMBLY JIG JACK STAFFORD MODELS *12111 BEATRICE ST. «CULVER CITY, CA. 90230

pod clear, the parachute can open and drag the pod o ff the glider boom. The • BOATS · TANKS · CARS thrust ring is inserted by using an engine • SUPER AIRCRAFT VERSION of the size you plan to use to push it up into the pod, after running a line of glue inside the back end of the tube. Leave about a 1/4 inch o f engine projecting. ^ To fly prep the recovery system as electric throttle shown in the instructions included with the engine. Friction-fit the engine in the pod by wrapping it with masking tape Electronic Speed Control with fu ll variable speed forward, until it makes a fairly tight fit. Launch­ reverse, DYNAMIC center stop. Full 15 ampere capacity. ers are described in the Centuri and FSI Actually conserves current. Send for free info: catalogs (incidentally, you can get one from Centuri at Box 1988, Phoenix, Arizona 85001). You hook her up to a INTERNATIONAL MARINE EXCHANGE car battery or other power source, (NO 2450 LOS SERRANOS DR., LAGUNA NIGUEL, CA. 92Θ77 fuses!) clear the area, hit the button, and you're underway. Setting up for the terms. Remember to send in your $5.00 Assemble the glider as per the in­ next flight is simple; collect the pieces, dues to the AMY A Secretary, Bud Sali- structions, except for fitting the rudder pull the old engine, and start over again. ka, 3917 Sunnyside Avenue, Brookfield, to the underside o f the fuselage to avoid So give it a try, if it interests you. It III. 60513. I’ll field questions either getting it fried off! Trim for a slight could turn out that, once you get a little directly at 7608 Gresham St., Spring- stall, which will improve the boost char­ exhaust smoke up your nose, you’ll find field, Va. 22151 (Send a self-addressed, acteristics; experience will soon give you that you have another exciting flying stamped envelope), or in care of other ideas to try. Oh, yea, build it extra hobby on your hands! · MODEL BUILDER. · strong; sooner or later everyone zorks one of them into the ground. Choppers . . . . Continued from page 25 Rocketry .... Continued from page 32 When it came time to design the The pylon should support the pod at pod, the side opposite the boom attach­ main rotor head and associated compo­ least a 1/2 inch above the wing surface, ment; this helps prevent the clips which nents for control, Charlie had some as shown. A little higher is allowable, connect to the engine ignitor from drop­ unusual ideas. Rather than experiment but too much will cause the whole busi­ ping o ff and catching on the stabilizer, with a variable speed motor unit which ness to nose down under power. The an embarrassing occurrence. The pylon would absorb power without giving length of the pod is rather uncritical, as is balsa, the same thickness as the glider performance in return, he chose to run long as it is at least 1 to 2 times the wing boom, and the alignment plates on the main rotor at full speed and control chord. Longer pods give improved boost either side o f it are thin plywood. The the vertical movements with a collective stability. They also make it easier to thrust tongue is cut from the glider pitch set-up. This was accomplished eject a parachute properly. boom, in the shape shown, and glued to in the time-honored fashion o f sliding the pylon. The alignment plates are then Note the string, knotted and glued to the swash-plate up and down on the carefully glued in place, and serve to the joint between the pod and the main rotor shaft and connecting it to keep the boom and pylon parallel dur­ pylon. This string (heavy carpet thread blade pitch arms. ing powered flight. Once the whole as­ is fine, or fishing leader) slips past the The rotor head itself was machined sembly is dry, test-fit it to the boom. It nose cone and is tied to a short piece of from Delrin, a space-age plastic, and should slip out backwards with a very shock cord, which is attached to the holds a pair of built-up rotor blades slight tap on the nose. If it ’s too tight, nose cone. The reason for this outside with a diameter o f 38 inches. The sand the sides o f the boom a bit, or sand attachment is simple; in case the shock main rotor blades are constructed in the back of the thrust tongue slot. of parachute ejection doesn't kick the the same manner as a sailplane wing,

8 6 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER CUV PRODUCTS, INC . 535 DAVISVILLE ROAD · WILLOW GROVE, PA. 19090 · (215) 659-3900

NEV-R-LEAK FUEL TANKS-BET THE SIZE YOU WANT IS LISTED HERE. É

With six different shapes | i = and anywhere from two m RST TYPE to nine different sizes for ROUND TYPE CYLINDER TYPE OVAL TYPE SLANT TYPE SLANT OVAL TYPE (SPECIAL SHAPE)

each of the shapes, we 1 oz. 4 OZ. 2 oz. 1 oz. 6 oz. 4 oz. probably have just the 2 oz. 8 oz. 8 oz. 2 oz. 8 oz. 6 oz. 4 oz. 16 oz. 4 oz. 10 oz. 8 oz. fuel tank you want. Just 6 oz. 6 oz. 12 oz. 10 oz. circle it here and ask 8 oz. 8 oz. 12 oz. 10 oz. 10 oz. your dealer for 12 oz. 12 oz. Sullivan’s Pylon Brand. 16 oz. 14 oz. 16 oz. that is, a spruce leading edge was used loosen up the tail drive, which has with a 3/16 x 1/2 spruce spar and considerable drag! If that doesn’t do it, balsa ribs placed on 1 inch centers for I suggested he remove the battery and the length o f the blade. A balsa run a pair o f wires from his car battery trailing edge was fitted and the entire to the model. We know it would fly blade (wing?) covered with Monocote. with all that weight out, but its useful­ Oh yes, the blades were built-up on a ness would be limited by the length of special workboard that has an 8° helical the wires! He hasn’t given up and I ’m pitch change from tip to root. . . this is sure we’ll hear very shortly that Charlie another of those “ Gilbert" details! has done it again! Keep tuned for the The stabilizer paddles were carved latest in "Electro-choppers” . from phenolic material and the swash- HELICOPTERS ANONYMOUS plate was machined from graphite im­ Got a call from John Gorham, who pregnated nylon . . . no bearings in this said that the club was doing great and assembly! The main rotor shaft was the membership was up to 22 regular turned from a length of 1/4 inch members, plus a few more who show titanium rod, which is almost as light up for the fly-ins. A couple of months as aluminum, and stronger than steel. ago, we ran pictures of the club activity The all-up weight of the chopper is and labeled one o f the members as 4 lbs., 4 oz., which is about 3/4 of a Stan Norwood . . . actually, his name is TOW Circular tow hook*. Pacif ten, Wak*YwW and Coup« pound heavier than programmed. Tail Stan Noar, and at the last meeting he tube* KSB Fuel and O T timer* S7 75 H o w engine MASTER mount»S7.50 BB Wadien. Hub*. Bu*hmg*. Bobbin*. rotor diameter is 8 inches, overall length was heard to say “ The only chance in WINCH F.E Asiembliei. Glen boom*. Dacron towline. Flag*. Mylar flash tape. Scale*. Zaic Yearbook*. Book o* of fuselage is 33 inches, and it stands my life to get my name in a magazine, $5.95 Airfoil* S3 00 Thermal streamer*. A R *topt and 17 inches high. Now, to the part you’ve and they had to misspell it.” Sorry Æ much, much more all been wailing to hear.. . about that Stan, you’ll have to short- __ F. A.I. Model Supply Does it fly? Well, no . ... not yet. out Gorham’s starting battery for that ψ o. eox ·7?ι JO μ·?· catalog PHOENIX. ARIZONA VjCAå Sorry to disappoint you with such an one, he sent me the names! Ha! John abrupt statement, but don’t despair, he also reports that the aluminum tube dry on the Jet-Ranger.. . Some months has hopes that it will fly with a few installation on the Heli-baby, in place ago, during my disenchantment with modifications. This evening, I went o f the stabilizer paddles, really makes the inverted engine on the Graupner 212, over to Charlie’s to take photos o f the that chopper go! John uses 3/4 inch I made a new engine plate and installed completed chopper, and turned it on to diameter thin-wall tubing about 1-1/2 a German Veco61 upright, with Schluter see what it would do. inches long, attached to the stabilizer clutch and cooling shroud. By the time Incidentally, when you get ready to bar with two jam nuts. Performance is the new power-package was ready to go, fly this bird, you simply turn on the said to be as good as the Kavan Jet I started something else and let the switches (nothing happens yet). Then, Ranger now, and that stability is not Graupner project slide. Now, it has as you move the throttle stick out of impaired. (See MB, Jan. 76). been re-installed (not without consider­ "lo w ” , a micro-switch turns on the FINAL APPROACH able modifications) and hopefully will motor and away she goes. About all we It ’s been a very busy month with fly next week-end. I still say, that is could get out of it was "swimming” the following projects stretched out one of the prettiest helicopter models around on the garage floor . . . it did along my work-bench: on the market today. become light and definitely would have 1. Rebuild the Helix Autogyro No, fellow modelers, I haven't for­ flown had it been just a few ounces 2. Complete Kim's Kavan Jet Ranger gotten you . . . I ’ve been too busy with lighter! I t ’s almost impossible to shave 3. Complete John’s scratch-built trainer the airline, and never seem to have o ff any more weight unless a better 4. Build a fuselage for Heli-baby (Hughes enough space in the magazine to answer battery system can be devised. 500) your questions and print your ideas. Next steps are to experiment with A last minute project was started I cheated a bit this month though, so different gear ratios (4:1 main) and yesterday while waiting for the primer to will list a few names o f interested APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 87 BETTER THAN A THIRD HAND!

0904. Would like help on getting started. 25, 1976, and will now be known as That’s it for now. BCNU next month. · “ RS Systems-a Tech Serv Company." According to Frank Goodwin, Presi­ Remotely .... Continued from page 16 dent o f Tech Serv, radios will be manu­ factured in Tech Serv’s plants in Mary­ By the way, controlling interest in land and Pennsylvania under the direc­ Coast Catamaran and its Hobie Hawk tion of Manufacturing Manager Curt Ne- Division has been sold to The Coleman Smith. Ron Ray, Engineering Vice Presi­ Co., Inc., of Wichita, Kansas, a company PANAVISE TILTS, TURNS, AND dent, will supervise the FCC type accep­ well known for its camping equipment, ROTATES TO ANY POSITION. tance transfer. Goodwin heads up mar­ especially gas lanterns. Production o f IT HOLDS YOUR WORK keting activities and will expand the Hobie Hawk gliders will not be affected EXACTLY WHERE YOU WANT IT. dealer and distributor network, as well by the change o f ownership, now or in as selecting additional RS Systems Ser­ PanaVise has great strength yet is gentle the future, contrary to conflicting ru­ enough to firmly hold delicate objects. vice Centers. mors. Quite possibly the finest new tool Tech Serv was founded in 1960 as a THEY REALLY NEVER LEFT you will buy this year, PanaVise is publicly-held electronics firm and has built to exacting professional During the WRAMS trade show, we been a prime supplier of digital elec­ standards. We guarantee it! caught some good-natured ribbing from tronics and lab equipment to the field Jerry Bonzo, Pro-Line’s marketing Illustrated is the $19.95 general o f experimental psychology. It also mar­ purpose Model 301. Three other shark, for not reporting that the com­ kets a digital electronic optical-scanning bases and a wide variety of heads pany was back in production. Playing it system for the plywood business, which are available. All interchange! Buy real cool, we just looked very surprized has become a standard for that industry. the basic unit, then add on to and commented that we didn’t know it Contact Frank Goodwin for further create a system. had ever gone out of business. information. Actually we were quite aware of the NOVICE VS MASTER Available through your dealer. momentary hitch, with its usual rumors W rite fo r a free catalog. R/C clubs in the Clintonville, Wiscon­ o f total collapse and the list o f prospec­ sin area are having a lot o f success with tive buyers, etc., but, knowing the ex­ an aerobatic competition known as the D ept. 10S cellent reputation of the radio, we were “ Valley Pattern.” Following a satisfac­ confident that its popularity would car­ 10107 Adella Ave., South Gate, CA 90280 tory 1975 season, Jim Vanderwalker, of ry it over the troubled times without the Clintonville R/C Club, sends us a In Canada: 25 Toro Rd., Downsview, Ont. too much hassle. Pace Industries, Inc., M 3J 2A 6 run-down on the rules. under the leadership of E.A. McDonald, Primary purpose o f the “ Valley Pat­ j A Division of Colbert Industries President, has picked up the ball and tern” is to provide a pattern competi­ ProLine Electronics will continue to tion for small clubs that can only put up produce the top-line radio that has guar­ enough prizes for 2 classes. Consequent­ modelers, in the remaining space: anteed its success over the past seven ly, Novice and Master (as well as Ad­ Leonard Malone, 3737 Arbolada years. Vice-President and General Mana­ vanced, Expert, and Bipers) can com­ Road, Los Angeles, Calif. 90027, phone ger of Pace, Alan Clouse, will head up pete on the same level. The only divi­ (213) 666-6291. Flies DuBro 500 and the ProLine operation. sion is novice and expert within each Kavan J et Ranger. Now for Pete’s sake, write to Jerry, category. This division could get a little Arthur Murray, R.D. 1, Box 593, at 10632 North 21st Ave., Suite 11, sticky because i t ’s somewhat on the Vandergrift, Pa. 15690, phone (412) Phoenix, Arizona 85029, and tell him honor system, however, in small local 567-5000. DuBro 300. Wants data on you read about it in MODEL contests, it’s morally tough for a known electrical noise and blade balancing. BUILDER! expert flier to sandbag. Basically, it goes Robert Rachan, 136 South St., Sun- ... AND NEITHER DID RS like this: bury, Pa. 17801, phone (717) 286-9568. Also announced during the WRAMS CLASSES: Novice and Expert (Not DuBro shark. trade show, in fact they had a booth, the AMA classifications). Self- Michael Hamm, 2789 Bardy Road, was the purchase of RS Systems by appointed, but CD may have to rule in Santa Rosa, Calif. 95404, phone (707) Tech Serv, Inc., 5301 Holland Drive, the case o f an “ unknown.” 528-2658. (2) Dubro 300 and (1) Shark. Beltsville, Maryland 20705, PATTERNS: Each flyer uses his Has modification data for above. (301)474-2900. The complete RS line, AMA Classification pattern; Novice, Ad­ Richard Lohrmann, 909 College Hill, including all equipment inventory and vanced, Expert, Master, Bipe. Cape Girardeau, Mo. 63701, phone 334- documentation was purchased on Feb. SCORE: Chosen pattern must be

88 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER COMPEL· TOTE d e l u x e MITER SANDER THE PLAN KIT... with scale documentation FIVE NEW CLASSICS, all with PMNTWOOD, DOCUMENTATION BOOKLETS. DECALS. GLOSSY PHOTO and ULTRA DETAILED PLANS . . . with Vac-Formed Cowls available. . . . In PEANUT and 1VS" scale, (or RUBBER. ELECTRIC or GAS Powered F/F or R/C. s W.95

• Sturdy Mode· Support • Gallon Fuel Con Compartment • Make Perfect Wing Butt Joint* At Precise Dihedral Angles e Ruoaed Interlocking Port* • Sands Bevel Angles To 50° In Balsa.Styrofoom, Etc. _ .. • Fuel Resistant Foam Rubber Cuihion • Work Cap«city 3" Thick x 14.5" W ide, Wing Halves 36 long (3 8 ” S P A N ) • Room For Storfer, Boltenes, Props, Tool* • Quick Build Kit. All Parts Pre-cut & Drilled • Easy Balance Corry Handle • Unique Fast Change 2 G rit Size Sanding Block • Pre-cut Ports For Fast Assembly • Pre-asse-nbled Slider Trock Assembly

We A c c e p t C O.D. O rders, Checks H eath Add $1.50 for post. & handling SUPER PARASOL' 'CUSTOM CRAFTl N.Y. residents add sales tax PRODUCTS 19 FlORGAT f *0. FARMINGDa LE N .Y . 11735 flown in its entirety. Maneuvers not Cells and Batteries; Application Infor­ flown get zero. Maneuvers that are at­ mation; Charge Characteristics; Battery tempted, but very poor, get an auto­ Life, Storage, and Maintenance; and a matic one. catalog o f G.E. nickel-cadmium battery FLIGHT SCORE (This is the key to products. the “ Valley Pattern"): Score is the total In the index, each section is broken of seven maneuvers. The Takeoff and down into sub-sections, sub-sub sec­ Landing scores are mandatory. The tions, and even sub-sub-sub sections other five maneuvers are the ones for (haven’t had a real good Sub since we which the highest points were earned in left the Wilmington, Delaware area). For the flight. The total number of Zeros in instance, under Section 3-Application the flight are then subtracted. This is Information, you find 3.4-Electrical your flight score. Remember, you only Considerations, and under 3.4.7— get a Zero if you don’t even tr y the ma­ Discharge Characteristics, you’ll find; neuver, otherwise you at least get One, 3 .4 .7 .1 — Discharge Capacity Rating, just for trying, even if you goof it up. 3.4.7.2— Discharge Voltage, and 3.4.7.3 We think the "Valley Pattern” is a E ffe c tiv e Internal Resistance . . . the great idea, particularly in the fact that a page number is given for each of the flier is encouraged, and rewarded, for above. trying a maneuver that he may or may Copies of this excellent reference not be able to complete . . . he has no­ material may be purchased directly Heath "BABY BULLET' thing to lose and two points each to from General Electric Company, Bat­ gain by tackling every maneuver. We’d tery Business Department, P.O. Box like to hear comments, particularly 992, Gainseville, Florida 32602. Single from clubs that give it a try. copies are $5.00 each, however, quan­ THE STRAIGHT POOP tity discounts are available (5 to 10 (2 7 ” S P A N ) copies at $4.00 each, 10-15 copies at Top pattern fliers will remember Red PEANUT PLANS ONLY: $1.00 Scholefield as the Contest Director $3.00 each, etc.) No CODS or stamps 1 VS" PLANS ONLY: $5.00 accepted. PEANUT KIT: S4.50/COWLS: $3.00 when the Rocket City Radio Control 1W" KIT: $10.00/COWLS: $5.00 Club o f Huntsville, Alabama, hosted the When ordering, tell Joseph C. Grant, (INCLUDES PRINTWOOD) 1972 Masters Tournament. He is now Advertising and Sales Promotion, that located in Gainesville, Florida, and is MODEL BUILDER sent ya. · GENE THOMAS, Manager o f Design Engineering for Gen­ BOX 681, MELVILLE, N.Y. 11746 eral Electric’s Battery Business Depart­ C ounter...... Continued from page 9 (S.A.S.E. lor literature) ment. Need a prop for your Peanut... for Red sent us a copy of the new 2nd your Walnut... for your sport rubber The Modelcraft Soaring Glider of the edition of the Nickel-Cadmium Battery F/F? Peck-Polymers probably has what 1930’s is being reproduced in a replica Application Engineering Handbook, you need. It is offering a complete line kit by CPM Products. The 29 inch span published by G.E., and for which Red of plastic propellers in five sizes. The stick ’n tissue free flight glider is a re­ was a contributing editor. In an attach­ props are molded o f a tough plastic plica of the Los Angeles company’s in­ ed note, Red comments, “ With all the com pound, with a molded-in free­ expensive model aircraft. The CPM kit material treating (or mistreating) nic­ wheeling cam. The sizes and prices are: features selected strip wood, and cleanly kel-cadmium batteries recently in the 4-3/4 inch, $ .15; 6 inch, .25; 7 inch, printed sheet wood. Two large sheets of modeling press, you will find this a use­ .30; 8 inch, .40; and 9-1/2 inch, .50. quality Japanese tissue are provided for ful reference.” The props are available from dealers or covering. The kit sells for $3.98 from The G.E. book, which measures direct from Peck-Polymers, P.O. Box dealers, or can be ordered direct from 5-1/2 by 8-1/2 inches, and is 5/8 inch 2498, La Mesa, California, 92041. Also CPM Products for an additional $1.00 thick, has, as the popular saying goes, new from Peck-Polymers is a stock o f to cover postage and handling. CPM “ Everything you’ve always wanted to light-weight Japanese tissue. The 24 x Products, 722 Lennox, Yreka, California know about nickel-cadmiums but were 18 inch sheets are available in red, yel­ 96097. afraid to ask.” It is divided into eight low, orange, blue, green, and white for * * * sections as follows: Introduction; Gen­ $ .30 per sheet. Prather Products is turning a skunk eral Description of Nickel-Cadmium * * * loose on the modeling world! Fortu-

APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 89 READY-TO-RUN ELECTRIC-POWERED THE QUIET WINNER Jerobee "Greenwood Vette" W/PROPORTIONAL THROTTLE. DYNAMIC BRAKING, LEXAN CHASSIS, REAR TIRES AND WHEELS "GLUED AND TRUED." Car without ra d io ...... S99.95 Car w ith Jerobee radio . .. S I79.95 Car with Futaba radio . . . S219.95 Complete electric conversion chassis, w / power train .... S57.95 Charging cord fits cigarette lighter — recharges in 20 minutes. LEISURE ELECTRONICS 11 Deerspring, Irvine, California 92714 Phone: (714) 552-4540 ^cce^ted^96 nately though, the Pole Cat has been The plane will be available from hobby attach the cable is to thread it through a thoroughly descented. The 56 inch dealers for $29.95. hole on the part to be moved, twist the wingspan trainer is intended for .10 to Also from Prather Products arc two cable together, and heat it with a match. .19 power. The Pole Cat features a accessory items. One is a very heavy- The nylon will melt, fusing the cable to­ strong plywood fuselage with plywood duty formed dural landing gear. The gether. A five foot length sells for 98 bulkheads and hardwood motor thick aluminum gear is predrilled with cents. · mounts. A plywood reinforced tailboom two mounting holes, as well as axle attaches the solid balsa tail feathers to holes. The large gear (which is the re­ Electric car. .. Continued from page 17 the fuselage. The flat bottomed, high placement for the Prather Panther sport chassis-mounted charging jack on the lift airfoil should make the Pole Cat plane) retails for $5.95. other. When the batteries are com­ easy to fly, and the pre-formed landing Another clever item from Prather is pletely discharged, you charge for 30 gear can be removed to allow landings nylon coated steel cable. This light­ minutes. Then, you charge for twice the on the built-in skid. The Pole Cat prom­ weight cable is intended primarily for length of time that the car is run, after ises to be an ideal trainer. . . strong, use as wheel brake activator line, each race. lightweight (2-1/2 to 3 lbs.), and easy to although modelers could probably find The Leisure Electronics “ Auto Char­ fly with two or three channel radio gear. many uses for it. All that is necessary to ger” unit eliminates guesswork and tab­ ulating. It precisely meters the correct CUSTOM R/C CAR COMPONENTS charge in 15 minutes and contains a built-in load to discharge the batteries without running the car, so that you can INC. be certain of a perfect charge for impor­ tant races. The unit sells for $29.95. It is most important to remember to re­ turn the throttle to the fully retarded position when charging. Otherwise, you can burn out the motor, or the rheostat ... or both. No doubt, there is a lot o f the real­ istic sound and smell o f racing that is lost when using electric power, but at least you’re not apt to be stopped en­ tirely by the environmentalists. Of course, if you win too often, the gas powered boys will probably make you run alone anyway! ·

HRE WINS 1975 R.O.A.R NATIONALS Peanut...... Continued from page 47 Before you start the wings, decide EXPERT OVAL RACE! how much dihedral and washout you want. I think you could get by with HRE performance makes the difference. Look at the scale dihedral, as discussed in recent record in the big races. articles which assert models fly well with none, but I didn’t have the nerve 1st. Expert Oval. 1975 R.O.A.R. Nationals to try it. Whatever you pick, the root 1st. Expert Road, 1975 R.O.A.R. sanctioned rib must be carefully aligned with this W INTERNATS. design since the wing-lo-fuselage joint must be perfect, not just for looks, but HRE COMPETITION CHASSIS...... $144.95 to take the flight (and the usual impact Includes all hardware, except engine, radio, with immovable objects) loads. I debated running a spar or two through the fuel tank, and body. Send for free catalog. fuselage but decided against it, and the model has proven to be very sturdy. HRE Inc., P.O. Box 4658, Irvine, California 92716 For the 1/16 washout recommended, 90 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER ------EKIogictrol------LONG RANGE & LOW CURRENT DRAIN IS WHY R/C SAILPLANE PILOTS CHOSE EK LOGICTROL For our full line brochure, write EK-logictrol, Dept. SR3322 Stovall St., Irving, Tex. 75061 Distributors, jobbers and dealers contact us for our new plan. Reliable radio control systems block-up the trailing edge during con­ struction so that it is built-in and you don’t have to fuss about warping. You V IVT W can cover the wings either before assem­ MACHINED M6TAI PRODUCTS bly to the fuselage or after. I did it t/8 SCALE R/C CAR ACCESSORIES before, since that way I could pin them FOR THE SCRATCH BUI LOER down during water shrinking and doping. This preserves the washout, and again no warps. CHASSIS PAN The tail is strictly routine except for REAR AXLE SIDE PLATES ENGINE MOUNTS the stab-to-fin mount. Use hard balsa BEAM FRONT AXLE i RISER BLOCKS for the fin-rudder and soft/light balsa BODY MOUNTS WING TUBES S MOUNTS ANTIC BIPE ... on the stab-elevators. If you’re confident PLUS MORE A TWO SEATER FOR WHEELS OR FLOATS - of getting the stab incidence right the W ITH A 64 SPAN AND 10 SQUARE FEET OF WING AREA Foi additional information, biocmire and ciuiogu« wné 0 S0< SEND FOR FREE INFORMATION Í PRICE LIST first time, just build it into the fin. I TO»-PROCTOR ENTERPRISES INC almost never can . . . in fact, I had to P O BOX 9641 V. M W . CO. SAN DIEG O CA 92109 take my Andreasson biplane apart after I M 0 -! EAST EOINGER AVENUE MFCO, AT 6821 CONVOY C T. S.N QICGO C>. initial assembly because it flew in a SANTA ANA. CALIFORNIA «705 weird skid/side slip and needed ballast. BOEING 247 MARTIN B-IOB s With adjusted incidence it did quite well Then I tried the 1/32 ply paddle without any ballast. So, I left a prop. Blades were formed by soaking GAMMA SCALE DRAWINGS generous 1/32 clearance in the fin slot in water, wrapping with cloth strips on ------V»------II" X 17" SHEET SIZE to permit changes to stab incidence an 8-ounce size frozen juice can (25° to -* ------J R ' - v F $ 1.00 EACH OR ALL 3, $ 2 .50 POST PAID during flight tests. 30° o ff axis) and again your slow oven. SEND 25€ FOR KIT 8 ACCESSORY CATALOG Now there’s the canopy. It really Assemble with hub, and sand blades for WILLIAMS BROS. MB 18) PAWNEE ST. SAN MARCOS. CALIFORNIA » 92069 should be a one-piece tailor fit. If you balance of prop and model. What you have vacuum forming equipment, that’s really want is a good glide and good- Test glide in tall grass (wonder how the way to go. (Little did the author powered flight, and by making several many times I’ve said that!) to keep from know what was in this issue! wen) tries at propeller weight, you should breaking the prop on landing. The I chose the lazy way out. A slow oven be able to avoid any clay additions to plane should glide straight ahead. When get the CG right. Hard balsa blades . . . as they say in cookbooks. After you’ve adjusted the rudder so it does, about five tries with different thicknesses would probably be just as good, but fire up the engine and fly. But I suggest they’re not as durable for the inevitable of heat-formable plastic, I got a fairly you keep the engine run down to about head-on collision with the basketball good one with 0.010 material over a thirty seconds . . . unless there's no hoop. male mold carved from balsa. Had one wind and you have a big open area. You should get a good motor run bubble on the aft edge but not too bad, Otherwise you'll have a long chase. with two loops o f 1/32 or one loop of and by then I was anxious to get in the If you’re like me, you’ll enjoy your air. Oven temperature was 275° or so. 1/8 rubber and fly in the 45 to 60 Flying Diamond. · Hot Stuff is great for gluing the canopy. second range. As always, total weight The real airplane was olive drab with is important, and you must keep it black trim and just letter markings on light. Actuals were: aircraft 8.0 grams, Soaring...... Continued from page 27 the fuselage. I didn’t have a picture of prop 2.5 grams, rubber 1.5 grams. The Monokote, or painted. It is· not nearly the real plane at the time I covered the first two could obviously be reduced. so prone to warp as plywood, and model, and during a hurried phone call, For example, remove every other stringer enough fo r fifty airplanes can be Monty Groves told me they were black. on the fuselage aft section, single cover scrounged from a cabinet shop. Bob The picture he sent shows white. Use the stabilizer, and use bond paper for epoxies a 1/16 inch brass tube along one lightweight tissue applied with dope, the fin fairing. Then lighten the prop. edge of the blade and uses two short water shrink, and finish with one coat of You should be able to remove 1.5 to 2.5 sections of tube at each end in the wing 50/50 dope. Add black details with grams worth without going the "ghost to make a mechanical hinge, with a tissue, tape, or dope as you prefer. ship” route. Hope you enjoy the model. piece of music wire through all three for I started with a typical plastic pro­ a hinge pin. Neat, clean, and reliable. peller. The model was slightly tail heavy, Diamond .... Continued from page 55 The other gimmick I swiped from so weight was added to the nose. That, Sand smooth, paint to your taste, him is his canopy attachment method. plus fairly high prop speed, resulted in mount the .010, and you're ready to fly A keyhole slot in the canopy floor, underwhelming performance. the Flying Diamond. along with a woodscrew, or machine APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 91 translated the metric specifications into units that are more easily compared to JOHN POND the planes we are now flying. I ’ll let the results speak for themselves. * * * Old Time Plan Service If you are looking for a big sailplane .. .really big, Ernst Tscheulin is manu­ The largest selection o f plans in the world at the most facturing a 183 inch span scale model reasonable prices. Each list 75c kit of the Glasflugel 604. This giant has an epoxy resin fiberglass fuselage, fully No. 5 OLD TIMER F/F GAS sheeted foam wings, and comes with the No. 6 OLD TIMER RUBBER/TOWLINE ailerons and spoilers cut out. Obviously, No. 6 OLD TIMER FLYING SCALE A through K this bird is intended for full-house soar­ No. 6 OLD TIMER FLYING SCALE L through Z ing. Price for everything needed to com­ plete the bird is over two hundred dol­ P.O. Box 3113 lars, but considering the amount of pre­ San Jose, Calif. 95156 fabrication and the inclusion of tender, Phone (408) 292-3382 loving German craftsmanship, it is pro­ bably worth the investment. You can be the first kid on your block to have one r ------by writing to Ernst Tscheulin, 7311 M l Nl ^ GLUE TIPS y T E E BAR Owen-Teck, Bohlstrasse 18, West Ger­ MAKES ANY GLUE TUBE ’ ALUMINUM EXTRUSION ( > 'V. SANDING BLOCK many. He has complete catalog sheets PUT TMI GLUE WHERE ^ lofu^wuh RUFF-STUFF with excellent black and white photos YOU WANT IT' ’•Sell adh«irr tandpaprr~ j i C V ’ of the 604, as well as several other kits M U å | S L $ · μ & * • Lttg· TtuaSurlm '* N \ · Woo l Wr«r Out 11 men $1.69 for smaller scale sailplanes, including the No m»i> to ··>' 9 9 C ’ ^ - · Handy 10 Ota 77 me* . $2.89 Cirrus, LS-2, and Kestrel. Prices on all are quoted in German Marks, and as R U FF'S ^ STUFF MINI s=r SANDER near as my translator can tell, there is % . ^ "SELF ADHESIVE SHEET ADJUSTABLE TENSION no price given for a complete kit, only λ α Γ SANDPAPER" HAND BELT SANDER the different components. You would MAKE YOUR OWN SPECIAL FIRMLY MOLDS PART H SANDING SHAPES FOR EASIER SANDING be well advised to find someone who · Adh«n to mott Matrix1. ^ 4 » · Paddad Hat» and Cur»« Handy lo Hold reads German proficiently, before V ' 5 ? · :'.Z. ; - O Í · No m*t*v φυ·. or drymf time 3 9 C • E «y to Um $1.39 ordering. ·

F ------^ AT 1 y ” \ APPLIED DESIGN CORPORATION M IN I -S T R IP S PRECISION DIE GUT Mod .urn Gam« Workbench . .. Continued from page 6 /|V n f lQ ) ttjiiHonivimomvi SAVESTIME REPLACEMENT FmaGamat AND EFFORT 9 V < SANOING 8ELTS At.Yd Watar Proof tell us what would be of particular in­ ______4______terest. Please send us your comments, is the first source that we have heard of and we’ll do our best to satisfy you. * * * R -C P LA N S that makes the lights locally available in all areas o f the country. Thanks for the Also new to MODEL BUILDER, be­ tip, Dave. ginning March 8, though certainly not * * * new to the hobby, and especially in Interest in the FAI R/C Soaring pro­ radio control, is Eloy Marez. Anyone CONSOLIDATED PBY-5A "CATALINA” gram is growing in the U.S. With the who has owned an Orbit radio in the I FT. WING SPAN team selection program finalized, inter­ past 5 or 6 years will probably know 411 RIBS 8 FULL FORMERS SHOWN ON PL4NS 11 est and activity is starting to become about whom we are writing, as Eloy has PLASTIC ENG.COWLS I 9.00 PR. (, rT M00tL been one of the top technicians with Or­ CLEAR GUN BLISTERS $6,OOPR> more specific. Several clubs are planning 'warm-up' contests in preparation for bit during that period. 4 LARGE PLAN SHEETS — Plans $13.50 the team selection quarter-finals. Many Eloy, whose articulate voice is com­ 6 f t . WING SPAN MODEL ΡΘΥ-5Α fliers are considering changing to sail­ pletely devoid o f any accent relating to o r d e r o ne n o w / / Plans $ 10.00 his Mexican ancestry (unless he wants it ______ado S lo p postage plane designs that are better suited to CATALOG-OVER 50 PLANS 5 0 $ DEALERS WRITE the rules. not to be) will be assisting MB’s editor, especially relating to advertising ac­ WORLD w ioF The FAI rules are clearly slanted to­ ward a fast, high L/D type plane. The counts and correspondence, of which SID MORGAN both, we are glad to say, are too much 13157 O R M O N D ,B E L L E V IL L E , M IC H .48111 U.S.A. very short speed course, and the long distance course, with emphasis on cover­ of a load for one person to handle. screw and blindnut, makes a simple, ing maximum ground in the least time, Orbit Electronics, by the way, is in positive canopy attachment that won’t all works toward the exclusion of a the throes o f change of ownership, with come off. You can tape it for security if slow, floater type plane. Since the one buyer taking the name and associa­ you wish, but I don't believe that it amount of experience with the FAI ted papers, while another has purchased needs it. Legion-Air owners.. .take note tasks is very limited in this country, I the test equipment. We will pass on of the drawing. This is just what you have been doing some research on the more information as soon as it ’s out of need! planes and fliers that are competitive the rumor stage. * * * overseas. GOODBYE . . . JOE DODSON Dave Phillips, of Chapel Hill, N.C., Radio Control Models and Elec­ We only met Joe Dodson for the first tells us that the Cyalume Light Sticks tronics, a British magazine, recently time at the 1974 Nationals.. . and met which we used for our night-time soar­ published the results of a survey com­ him again, only briefly, at the 1975 ing contest are now available from Sears piled by Willy Schoorel. The survey was Nats. Yet, in those two short encoun­ Roebuck. The 1976 Spring-Summer cat­ done on a random sampling of the 65 ters, we recall an enthusiastic and ex­ alog lists them on page 621. The stock entries in a large FAI contest held in tremely energetic modeler. Word comes number is 9K 57033. A package of Dortmund. I picked out the ten planes from John Kiker, a fellow NASA mem­ three lights is $2.95 plus shipping. This that finished highest in the contest, and ber, o f Joe’s death, from cancer, on De- 92 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER CLASSIFIED ADS INDEX TO ADVERTISERS Ace R /C In c ...... 95 Noncommercial: Rate is 25 cents per word with a minimum of $3.00 worth. Commercial: Rate is 40 cents per word with a minimum of $5.00 worth. No A stro F lig h t In c ...... 2nd Cover mail-order discount house ads knowingly accepted. Applied Design Corp ...... 92 All ads are payable in advance and may be for any consecutive insertion period Cannon Electronics ...... 64 specified. Name and address free. Send ad and payment to: The MODEL BUILDER. Carr S a ils ...... 84 Classified Ads, 1105 Spurgeon, Box 4336, Santa Ana, California 92702 Century 21 ...... 64 Cloudbuster V enture ...... 66 C o v e r ite ...... 70 IGNITION ENGINES: The entire O.S. Max 50th NATIONALS SOUVENIER BOOK line of fine engines is available converted to I ncludes reprint of rare aeromodeling course, Jim C rocke t R e p lic a s ...... 82 ignition engine operation. These engines plans 10 best models from First Nationals C ustom C ra ft P ro d u c ts ...... 89 are eligible for OLD TIMER competition and period, capable of maxes today. Plus 5 lost D u-B ro P roducts In c...... 69 are the very finest obtainable anywhere. We Nationals, and much more. COLLECTORS E.K. Products ...... 91 also offer a complete line of ignition access­ Limited Edition. Send SASE now for advis­ FAI Model S upply ...... 87 ing your special low discount price (under ories, ie, coils, timers, condensers, etc. Send Flyline M odels ...... 66 for free 1976 price list. 77 Products (Otto $4.25) dependent upon total reservations at Flying Scale M odels ...... 78 Bernhardt), 17119 So. Harvard Blvd., Gard­ press time. Bert Pond, 128 Warren Terrace, ena, California 90247. Longmeadow, Mass. 01106. Fox Manufacturing ...... 68, 76 Fusite C o rp ...... 75 FOR SALE: MODERNISTIC MODELS "PERRY DIRECTIONAL PORTING" Glider Guiders ...... 64 New info. Market value $6,302. Over 300 A patented modification for baffle-type en­ Gas M odel P ro d u c ts ...... 68 gines. See Feb '76 RCM. Supertigre engines, steady customers. 4,729 plans, 4 storage cab­ Carl Goldberg Models ...... 63 inets. After complete inventory and re-eval­ $20.00 plus postage. Nightingale Mfg., 218 Golden Age Reproductions ...... 62 uation, now priced at $2350. Call (213)- Via El Centro, Oceanside, Ca. 92054, phone G ulf-S o uth A e ro m o d e ls ...... 78 766-5868. (714) 433-2281. Herb's Model M otors ...... 61 SCALE "CURTISS HAWK" PLANS: 2" R/C COBBIE'S features: $2.00 engraved name- Hobbypoxy Products ...... 65 P6E, 2" R/C P1 A, 2" R/C F/C-3 (Red Ripp­ number identification plaques for field box­ HRE In c ...... 90 ers) all 3 sheets, 30 by 72, blackline, $13.50 es, transmitters, trophies. Adhesive backed, International Marine Exchange ...... 86 per set. Coming soon 2" R/C YP23. Smith 3-5/8" X 1-1/8", line limit 26 letters and Plans, Box 8, Snowmass, Colo. 81654. spaces, maximum 3 lines. Cobbie's Gifts, K & B M fg ...... 60 Box 2, Dept MB, Deal, New Jersey 07723. Kraft Systems ...... 3, 71, 72. 73 BOAT RADIO & WINCH: Heathkit 4-chan­ K ustom K ra fts m a n s h ip ...... 62 nel, ni-cads, 2 servos, $150; Harris winch, BRAND NEW PEANUT PLANS: Gee Bee Leisure Electronics ...... 90 servo & speed control, $50. John Decker, R-1, J.E.A.A. S-1, Chester's Jeep. One buck Leisure P ro d u c ts ...... 85 Annursnac Hill Rd., Concord, Ma 01742 each. Illustrated plans catalog, S.A.S.E. M icro M o d e ls ...... 62 (617) 369-6047. AERO ERA,c/oTom Houle, 11333.N. Lake Shore Dr., Mequon, Wise. 53092. Midwest Model Supply Co...... 79 TRUE! Earlier magazine called "Model Air­ M odel and C raft S h o w ...... 2 plane News." Several copies January 1929, FOR SALE: Hundreds of old model maga­ Model Builder Binders ...... 66 Feb./M ar. 1929 issues @ $3.00 each o r $5.50 zines, 1930 to present. Send SASE for free Model Builder/Pana-Vise C ontest...... 4 both. Mark Levinson, 95 Bowman St., Ham­ list. Arthur Suhr, W218, N5866 Maclynn Ct., Model Builder Products ...... 3rd Cover ilton, Ontario, Canada L8S 2T5. Menomonee Falls, Wise. 53051. Model Racing Products ...... 83 BOATS . . R/C ELECTRIC . . Solid state OKIE BIRD . .1 /2A contest F/F. Wing area Model Rectifier Corp. (MRC) . . . 4th Cover electronic, full variable speed controls, mo­ 286. Kits $7.95 each. Add 10% for postage. Sid Morgan (Vintage Plans)...... 92 tors, special machined shafts, props, drive CLEMCRAFT, P.O. Box 524, Sand Springs. M 8i S L td ...... 85 systems, multiplex control panels, fire hose Oklahoma 74063. Octura Models ...... 83 nozzles, sirens, whoopers, boat whistles, fi­ P a n a -V is e ...... 88 "SAILPLANE DESIGNERS HANDBOOK." berglass hulls, etc. Free literature. Write to: P e c k -P o ly m e rs ...... 82 INTERNATIONAL MARINE EXCHANGE Easy, complete instructions. $5.96. Eric John Pond O .T. Plan S e rv ic e ...... 92 1 7, Al Gray, 24501, Los Serranos Dr., La­ Lister, 953 Klockner, Trenton, N.J. 08619. Probar Design ...... 84 guna Niguel, Ca. 92677. New ideas and EXTENSIVE COLLECTION, magazines and products welcomed. P rocto r E n te rp ris e s ...... 91 vintage plans. Lists S1.00. Guerrieri, 107 R /N M o d e ls ...... 87 WANTED — Will buy multi-cylinder model Alameda, Redwood City, Calif. 94062. Rocket City Specialties ...... 77 airplane engines. In particular, the older S atellite C i t y ...... 77 spark ignition and certain glow ignition. All TISSUE PAPER, 10 cents per sheet, 19 letters answered. Russel Sprague, 8800 colors, send SASE for sample. Bill Wilson. S.C. M o d e le r ...... 81 Green Lane. Randallstown, Md. 21133. P.O. Drawer U, Kountze, Texas 77625. Sig M fg. C o...... 96 Special Edition Plans ...... 74 cember 4, 1975. Another close associa­ warmth, friendliness, and zest for active Jack S ta ffo rd M o d e ls ...... 86 S terling M o d e ls ...... 67 te, Paul Marchal, gave us the following participation. Sullivan Products ...... 87 information. THINGS TO DO Su-Pr-Line Products ...... 76 jo e Dodson began his modeling On April 25, 1976, the Jefferson Tern A e r o ...... 81 career under the guidance of the late County Fairgrounds, in Denver, Colo­ Top Flite M odels ...... 1 Carl Hopkins, Clarksburg, West Virginia. rado, will play host to the biggest model Gene Thomas ...... 89 Joe began work at Langley Field, Vir­ show in Rocky Mountain West, the An­ Tyro Model & S u p p ly ...... 64 ginia, for NACA in 1940. Later this be­ nual Model Builder’s Exposition, put on V L P ro d u c ts ...... 82 came an NASA installation. His early by the Model Museum Flying Club. The V ic to r M odel P ro d u c ts ...... 84 V M W ...... : ...... 91 work included precision model building, show will include manufacturer’s ex­ V o rte x M odel E n g in e e rin g ...... 85 design of dynamic test models, and roc­ hibits, club displays, and swap-and-sell. Peter W e s tb u rg ...... 81 ket test models, and later, work on all Contact John Allen, 463 Kline, Lake- W ilh o ld Glues In c ...... 88 NASA Manned Space Programs. He was wood, Colorado 80226, or phone W illiam s B ros...... 6 1 ,9 1 awarded the NASA Exceptional Service 303-985-3268. J .L . W ittm a n C o ...... 74 Medal in a ceremony in Washington,D.C. CORRECTIONS World War II Scramble ...... 80 joe held various National records, In our February, 1976 "Over the and set the Cat. II Half A Open R.O.W. Counter,” we mentioned the R/C Soar­ ditional 9 cents from California resi­ record at the 1974 Nats, and repeated ing San Diego Area Handbook wich is dents for Governor Jerry Brown’s die­ his win at the 1975 Nats. As a SAM available from the Torrey Pines Gulls, tetic lunches. member, he placed second in .020 Rep­ Box 1564, La Jolla, California 92034. * * * lica at the ’74 Nats. Also an avid hunter, What was not mentioned was the fact In the January “ Remotely Speak­ gunsmith, and a member of NRA, his that an additional 30 cents is required ing,” we commented that unofficial m any friends will remember Joe’s for postage and handling, plus an ad- events, such as Half-A R/C Pylon are APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 93 FULL-SIZE PLANS No. 376-O.T. A.T. TRAINER $1.50 No. 12753 SOLIDIFLIER $2.00 Sport rubber model from 1936 A ir Trails. All-balsa A/1 Nordic with ribless Jedelsky SERVICE Good flier, 30" span. Chuck Blackburn. wing. Span 47". By George Perryman. (with instructions) No. 2761 DRAGONFLY $4.00 No. 1275-0.T. THE PIONEER S4.00 R/C funship, looks like giant rubber stick Earliest gas jo b b y Ben Shereshaw. Para­ model. Superb trainer. By Tex Newman. No. 4761 WEST'NER $3.50 sol, 80" plug-in wing. By Phil Bernhardt. Six-tenths scale model of great old timer No. 2762 "KILLER" SAUCER $1.50 No. 11751 NAVY FLYING BOAT $6.00 for pulse R/C. Redesign by Doc Mathews. For C/L combat, or just attracting atten­ "Composite" scale R/C flying boat bi­ No. 4762 PROFILE GUARDIAN $3.00 tion. 22" diameter. By Howard Evanson. plane, 6 ft. span, 40-61. George Clapp. Popular design for Profile Carrier event. No. 2763 AMERICAN "EAGLET" $3.50 A consistent winner. By Bill Melton. No. 11752 "TWIRP" S0.75 F/F scale 1930 lightplane. for rubber or Beginner's fuselage rubber powered ship. No. 4763 VACUUM TABLE $1.00 electric power, 48" span. By Tom Laurie. Teaches stick 'n ' tissue. By Dave Gibson. Dimensioned, half-size plans for easily- built vacuum former. By Ron Williams. No. 276-0.T. "LONG CABIN" 53.50 No. 11753 "LUNAR-TIC” $3.00 G ood lookin g, stable cabin gas m odel of Classic-looking, high performance Half-A No. 4764 FLYING DIAMOND $1.00 the 1937 era. Span 78". Phil Bernhardt. free flight. Easy to build. Harry Murphy. Interesting all-sheet experimental sport F/F rhomboid, for .010. By Ken Willard. No. 1761 PATTERN SPITFIRE S4.00 No. 1175 O.T. FOO 2-U-2 $2.50 Scale-like .61 powered pattern ship flown A pre-Zipper design by Dick Obarski, re­ No. 476-O.T. CABRULER $3.50 at 1975 World Champs. By Tore Paulsen. duced to .020 Replica, by Ron Sharpton. Never-before-published Class A cabin m o­ del New Ruler, by designer Hank Struck. No. 1762 TEXAN 750 S4.50 Popular Class B-C free flight, modified for today's engines/rules. Jim Scarborough. Price includes 3rd Class postage and reprint of building instructions (if any). Add 454 No. 3761 SEASQUARE $5.00 No. 176-O.T. KORDA WAKEFIELD $2.00 PER PLAN for 1st Class postage. Add 504 A .19 powered flying boat for 3-channel The classic of all rubber powered comp­ for overseas orders (except APO's). radio. Span is 50". By George Wilson. etition free flights. By Phil Bernhardt. Send self-addressed, stamped business size No. 3762 FLIP $1.00 No. 12751 CLIPPER AMERICANUS S4.00 envelope for free copy of complete plans list. Easy-to-construct, all balsa 1/2A sport/ Composite scale R/C model of modern jet CALIFORNIA RESIDENTS ADD 6% TAX. stunt control liner. By Dick Sarpolus. airliner. Span 48", .09 eng. By Art Hall. S E N D TO : No. 3763 ORCA $4.00 No. 12752 FOUND $1.50 MODEL BUILDER PLANS SERVICE Hot FAI power model with all gadgets. Scale rubber powered seaplane of Canad­ 1105 SPURGEON, BOX 4336, Sheet covered surfaces. Larry Sicuranza. ian design. Span 26". By Walt Mooney. SANTA ANA, CALIFORNIA 92702

not covered by AMA insurance. This is close to enough to .66666 etc. In other wing shape, the center o f lift takes place incorrect. Actually, AMA insurance has words, the nearest whole numbers are to 1/3 back from the leading edge.’ nothing to do with the rule book. This be used, ie, 7 o f 11, 7 of 10, 6 of 9, 5 of “ Acquiring a set of Bolonium Curves, use to be true, but is no longer. Now it 8, 5 of 7, etc. Gotta do the best with I proceeded to draw up a new airfoil. I is not what you fly, but how you go whatcha got, right? carefully located 1/3 back from the about doing it. As long as you fly in TECHNICAL DISSERTATION leading edge, the C e nte r of L if t. accordance with the Safety Code, insur­ It isn’t often that the “ oracle from “ Locating the C e nte r o f L if t directly ance coverage is provided. Ave. O,” otherwise known as “ The over the C enter of Gravity ... and adja­ CLARIFICATION Grayte Goldy,” takes the time to write cent to . . . the C e nte r of Lateral Area, I Recent controversy over the passing down a solid tid-bit of aeronautica for now had a POINT. I took this POINT, of certain AMA rules has exposed a us mere mortals. When it happens, we and got into my car, and drove out to mathematical fudge factor. At some must copy it down immediately, as the the flying field. Facing into the wind, I point in time, it was established that Great One only writes on thin, highly hand launched my POINT, which flew two-thirds is passing when it comes to perishable layers o f bagel dough. directly over the horizon and disap­ contest board voting. Problem is, the “ The time has arrived for the Grayte peared. 11-member board can't be divided by Goldy to once again chronicle a major “ This proves that you d o n o t need a 2/3 . .. not without chopping one mem­ event in model airplanc’s-ville. wing in total, just the point which is the ber into two voting parts. Consequently, “ I present. . . ‘The Grayte Goldy’s center of lift. contest board procedures state that 7 is 1/3 Back Theory.’ In leafing thru Charly "N ow all I need is a radio the size of a two-thirds of 11. Actually, it’s .636363 Grants’ Model Airplane Design I noticed point. etc., but it was considered that this is the following para-graph, ‘on any given The Grayte Goldy ” · 1 A IIM A FREE SUBSCRIPTION TO WIN model& V i l l i BUILDER/ MAGAZINE Out of the goodness of our hearts (heh, heh), we offer our readers the following opportunity to win a FREE ONE-YEAR SUBSCRIPTION (or subscription extension) to MODEL BUILDER Magazine: Send us the name and address of any the earliest postmarked letter about that kn ife set. hobby shop in your area that does not dealer, you win the free subscription .. . Send references to: carry MODEL BUILDER. \Ne will then for yourself or the person you name. If MODEL BUILDER. Dept. D, give them our sales pitch, and if the y you already subscribe, you may choose Box 4336, Santa Ana, Ca. 92702, become an MB dealer, and if yo u rs is to substitute an Uber Skiver precision or phone (714) 547-3963.

94 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER f ■v

Due to its small size, light weight, si city, and low cost, pulse proportional der-only flying is an ideal way for one budget who wants to get into R/C or sport flyer who needs a second system fun flying.

The sensibility of small, rudder control airplanes continues to increase as the n to economize becomes more and more portant. Don't let an economic pinch p vent you from enjoying your favorite hob

Units are wired, tested, and guarantee Complete w ith airborne nicads and charge

- BABY. _$69.95 I10 G 15) - » · •*?-A'5r'H5rne'weight = 2.35 oz. — RecQmmendød for .01 0 and PeeWee planes noi areater than 3 6 ".span. BABY TWIN $72.95

-Airborne, weight = 2.55 oz. *.* 1 «I f ' - -· -F o r Pee Wee .020. Tee Dee .020. ancl'siow. ' ·■“ ■*.'’ flying Babe Bee .049 planes up to 40” span. STANDARD $71.95 liöGiel ; - · · . · — ÄTrbbrne’we‘ig^tr3 J 02. , ; — For Babe Bee.and stow flying Tee Dee .049 strips up Ί ύ 4 2 " span. STOMPER $74.95 (iocÍ7) ’AVAILABLE ON: 3 6 .9 9 5 ; 2 7 MS. 27.095. 27.145, 27.195 mHz - I —Airborne weight=»4.1 02L Recommended for hot;: 049 to slow flying .IS power ad- ships......

Please send me your complete catalog. Enclosed is I $1.00 which is refunded on my first order. (Add S .50 fo r 1st class m ail re turn ) I I ACE B/C. In c . Name s A ddress I BOX 511 D HIGGINSVILLE, MO. 64037 m I

APRIL 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 95 TWO OF A KIND

IDEAL FOR FLYING FROM CONFINED AREAS

^ S I G ^ f KIT RC-36 $ 18.95

KLIPPER Designed by CLAUDE McCULLOUGH

Flat-Bottomed Ready-To-Use Foam Wing Built-Up Balsa Fuselage Sheet Balsa Tail Surfaces For .09 to .15 Engines Room Enough For Standard Size Radios For 2 or 3 Channels 45” Wing Span

KIT RC-37 «17.95

SUPCR SPORT Designed by MIKE GRETZ COMBINING THE CONVENIENCE OF A READY-TO-USE MOLDED FOAM WING WITH THE STRENGTH AND RESILIENCE OF A BALSA FUSELAGE AND TAIL

KLIPPER & SUPER SPORT KIT FEATURES Handy Printed Fuselage Sides - Molded Foam Wing Build Internal Structure Directly On The Wood Die-Cut Plywood Aluminum Landing Gear Aluminum Motor Mounts Plus: Coil Spring Nose Gear, Nylon Bearing Tuf-Steel RC Links And Steering Arm On Klipper, Nylon Control Horns Tail Wheel Included On Super Sport Molded Plastic Control Hinges One Piece ABS Molded Cowling Illustrated Instruction Book

See your dealer first. To order direct add $1.00 postage in the U.S., $1.50 in Canada. No C.O.D. PLACE YOUR ORDER NO W FOR SIG’S LATEST COMPLETE CATALOG - $1.50 POSTPAID SIG MANUFACTURING CO. . . Montezuma, Iowa 50171

96 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER IN THE BEST CIRCLES, IT’S ttb er «»kivcr

A PRECISION INSTRUMENT FOR THE DISCRIMINATING MODELER

• Safe, Rear Draw-Bar Clutch Available in seven anodized handle colors: silver, blue, red, green, gold, copper, violet. • Precision, Instrument-Quality Materials Complete set in fitted hardwood case; includes • Strong-Holding Advanced Collet Design uber Skiver, together with two vials containing • Non-Rolling Hex Cross-Section six No. 11, six No. 15, one No. 12, and one • Deeply Knurled, Non-Slip Grip No. 20 ... A total of 14 blades $12.95 Individual handles Ispecify color) $5.10 • Long-Life, Stainless, Vial of 6 blades (No. 10, 11, 12, 15, Surgical Steel Blades or 20) $2.10 20

See y o u r dealer, o r order d ire c t. Dealer inquiries are invited. MODEL BUILDER PRODUCTS All direct orders sent postpaid in U.S. California residents add 6% sales tax. 1105 Spurgeon, Box 4336, Santa Ana, California 92702 Up till no the Nark V was f 1 ' * ]the best 5 channel we ever made!

Introducing MRC’s New “765” Sernas

You might say we’ve taken the best of our Mark V and bulit an even better system around it. Remember, Mark V made its reputation proving its consistent reliability and superior range. The Mark V had quality in the box and sensible pricing on it. We haven’t compromised any of this. What we did do, We can’t really describe the great feel of the sticks, was add some step-up, customized, professional- or prove to you the system's superior range until you type features. get on the field. But keep in mind, we told you the There are new, adjustable length, ball bearing, Mark V was a winner. And you proved us right in pivoted sticks for smooth, responsive, custom con­ Sunday flights and competition flying. Now we’re trol; longer-life potentiometers; a high impact, telling you the “765" is even better. It has the range, molded, shock absorbent carrying case, and 7 servo reliability and a professional feel about it that makes designs to choose from. it the best 5 channel system we ever made.. .at the We’ve kept the mil spec, gold plated connectors; best feature-for-dollar price you've ever seen. At double tuned front end receiver; transformer your hobby dealer, now. isolated charging system and nickel cadmium “765" features 5 channels, 4 servos, batteries throughout. And of course, the entire nickel cadmium batteries in receiver I ^ system is supported by MRC’s uncompromising and transmitter, charger, field carry- standards of quality and service. ing case. ^

MODEL RECTIFIER CORPORATION · 2500 WOODBRIDGE AVENUE · EDISON, NEW JERSEY 08817