NEW HALF-PINT' CABIN CRUISER (Kit CC-10) NEW SKEVEE 10 (Kit SKV-10) An 18 model that's easy yet satisfying to build Makes an ideal Hours of fun are packed into this 18" wood ski boat model that "starter' for the beginning R/C boat modeler Designed for 049 has a V bottom for competitive racing even in rough water Looks engine and performs like the big boys", uses 049 engine

HERE’S A NEW RC MODEL BOAT RACING CLASS... AND IT’S EVEN POPULAR WITH YOUR WALLET!

All the fun of R/C model boating is yours at a price anyone can afford with a new Dumas Vi A kit, inexpensive to buy. build and run minimum fuel consumption and noise! ■ For under $ 14 00 you can buy any kit on this page. And because they're just 18" long, they need only an inex­ pensive 049 engine and hardware. A 2-channel radio and you re ready to go (Approximate Total Cost: $ 1 6 0 !)· Each Dumas model has been pre-tested for ease of building and performance. ■ See your dealer for a pre-packaged hardware kit with everything you need for running Cool clamps and props available separately If he can t help, write us.

NEW DEER VEE 10 (Kit DV-10) TRIED AND TRUE SK-DADDLE JR. (Kit SK-3) Here's ante long Deep Vee that's already proved itself This hoi little boat gets more popular every year in competitive racing. Built of mahogany plywood and For swimming pool cruising with an electric motor or veneer Great in rough water or calm Uses 049 engine competitive racing with the Vi> A s

See your hobby dealer or send 50<£ for our complete catalog d u m a s boats Dumas Products, Inc., 790 South Park Ave.. Tucson, Arizona 85719 CARL GOLDBERG

43”SPAN 29 V ’LENGTH 390 sq. in. AREA

the ALL NEW control line

m u r n e

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! Kit has huge decal sheet with 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 254 for 8 pg illustrated ■ Catalog with Basic Explanation of R/C you want! Fly the Flying Tiger! I Equipment and Radio Control Definitions

For best service, see your dealer. If not available, A V A IL A B L E Name. write direct: add 50dper item ($1.00 outside U.S.). IN C A N A D A A ddress. CARL GOLDBERG MODELS INC. C ity . 4736 WEST CHICAGO AVE.· CHICAGO, ILLINOIS 60651 State. Zip .

MARCH 1976 1 MODELS' » 'Δ ΔVISE 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 competition 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 clean, pencil draw­ ings with all pertinent dimensions indicated. A p rint o f the drawing is acceptable. 4. A written description should be included with photos and drawings, explaining in fair detail any unusual features o f 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 fo r published designs w ill 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 o f the judges w ill 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. m itted 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 o f series is July 1, 1975, and winners w ill be announced the model. Include some familiar object in at least in the September 1975 issue. Subsequent entries w ill one photo to indicate the size o f the model. Try to be due the first o f each month and winners w ill be include photos o f any significant details. announced the second month following each closing.

The winner for March is DENNIS NORMAN, Lakewood, Ohio. His entry is a 3-engined, rubber powered Caproni Ca 5 bomber. Built to 1/2 inch scale, the bomber spans 39 inches, and weighs 6 ounces, without the three 6-strand rubber mot­ ors. Crew figures are carved from styro­ foam, and the eight wire-spoke wheels were specially made for the Caproni by Fulton Hungerford. At the time of the photo, the ship had won numerous static scale trophies, but had not as yet been flown.

2 MODEL BUILDER mi immNnmmMHi mu mm Airtronics and Cox have joined hands! Both companies are world renowned for the highest levels of quality and performance and will provide you with a new systems approach to model products. A new company has been created to develop and produce products for the discerning modeler who is interested in value, quality and j excellence in design. Look for our new logo — it’s your guarantee of a superior product. f ------\ %AIRTRONICS KITS AND ACCESSORIES ENGINES AND ACCESSORIES

AND A BRAND NEW LINE OF RADIO SYSTEMS

Available in 2, 3, 4, & 6 Exciting Technical Features CCMT/SA/VIfA Channels On All Frequencies Including The World's Smallest Servo SEE OUR EXHIBIT AT THE WRAMS AND TOLEDO SHOWS FOR FULL DETAILS OR SEND 250 FOR OUR FULL 16 PAGE CATALOG READY NOW AT YOUR HOBBY SHOP!

%AIRTRORICS J

36 inch span, 252 square inches 16-20 ounce flying weight

★ For the novice who has never built or flown an R/C $ 17.76 model. ★ Precision machined parts and all hardware included. ★ Perfect for schoolyard flying with the new Cox QRC Engine.

FOR ADDITIONAL INFO WRITE OR CALL:

Phone: (714) 540-8200 in Canada Contact: 1525 East Warner Avenue Leisure Dynamics of Canada Santa Ana, Calif. 92702 1315 Lawrence Ave. East a subsidiary of Leisure Dynamics Inc. Don Mills, Ontario, Canada

1ARCH 1976 FOR THE MODELER INTERESTED IN MAXIMUM PERFORMANCE CONQUEST .15 R/C FOR QUARTER MIDGET RACING OR SPORT FLYING ★ Schnuerle porting for highest rpm & power. ★ High strength steel crankshaft running in 2 $59.95 precision ball bearings. Cat. #2810 ★ Fully counterbalanced for low vibration. ★ Precision die-cast crankcase. ★ Perry carburetor for smooth reliable idle. ★ Optional muffler or exhaust extractor. ★ World famous precision Cox craftsman­ ship. ★ Replacement parts readily available. ★ Also available without throttle for free-flight and control-line competition flying. Cat. #2800, $55.95 READY IN JUNE 1976 CONQUEST .40 RIC & SPEED FOR THE 1/2A SPORT FLIER WHO NEEDS QUIET POWER QRC »049 MAXIMUM POWER WITH MINIMUM NOISE FOR SCHOOLYARD FLYING

$ 12.95 Cat. #450-1

★ Factory installed muffler. ★ Oversize tank for longer flights. ★ Built-in spring starter. ★ Highest power reed-valve engine with spe­ cially ported cylinder for maximum power even when fully muffled.

FROM THE LEADER IN 1I2A ENGINES AND ACCESSORIES

4 MODEL BUILDER MODEL& MARCH 1976

BUILDER volume 6, number 51

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

STAFF CONTENTS

EDITOR FEATURES Wm, C. Northrop, Jr. WORKBENCH, B ill N o r t h r o p ...... 6 GENERAL MANAGER Anita Northrop OVER THE COUNTER,T a y lo r C o llin s ...... 7 EDITORIAL ASSISTANT REMOTELY SPEAKING, Bill N orthrop ...... 14 Le Gray ASST. GEN. MANAGER “ IS SOARING FOR THE BIRDS?” (Part 2), J im G r a y ...... 18

Dawn Garrott PLUG SPARKS, J o h n P o n d ...... 19 ART DIRECTOR CHOPPER CHATTER, J o h n T u c k e r ...... 24 Paul Plecan

SECRETARY STRICTLY SAIL, R o d C a r r ...... 26 L. Gordon FOR MS. ONLY, C h a r R o h rin g ...... 28 SUBSCRIPTION MANAGER A. Valcarsel CONTROL LINE, D an R u t h e r f o r d ...... 32

R/C SOARING, Le G r a y ...... 36 CONTRIBUTORS PRODUCTS IN USE, J o h n P o n d ...... 38 Rod Carr Fernando Ramos Chuck Hallum Char Rohring F/F SCALE, F e rn a n d o R a m o s ...... 42

Bill Hannan Dan Rutherford HANNAN'S HANGAR, B ill H a n n a n ...... 44 Walt Mooney Bob Stálic k FREE FLIGHT, B o b S t a l i c k ...... 46 John Pond John Tucker PRODUCTS IN USE, B ill N o r t h r o p ...... 50

ADVERTISING REPRESENTATIVES R/C AUTO NEWS, C h u c k H a llu m ...... 54 WEST: Bob Upton, 20626 Clarendon Ave. Woodland Hills. California 91364 “ GO FLY A K ITE !", K e ith G e b e r s ...... 56 (2131 884-2294

EAST Walt Moucha. 38 Coppersmith Rd., Levittown, New York 11 756 SCALE VIEWS (516) 796-4898 CURTISS A-8 “ SHRIKE", P e te r W e s tb u r g ...... 58 JAPAN: World Media, Inc., Eiji Noguchi, Director, Chinatown Bldg. 202, Yamashita-cho Naka-ku, Yokoha­ CONSTRUCTION ma (231), Japan. Tel (045) 662-8128. Cable WOMEDIAC. SEASQUARE, George A. W ilson, Jr

“ THE TRAINER” O.T., C h u c k B la c k b u r n ...... 23 Subscriptions $15.00 per year, $27.50 for two years. Single copies $1.50. Add S2.00 “ FLIP” U/C, D ic k S a r p o lu s ...... 3 5 for postage per year outside of U.S. (Except APO). Add 75 cents for Canada and Mexico. “ ORCA” FAI POWER, L a r r y S ic u r a n z a ...... 41 Copyright 1976 by MODEL BUILDER Magazine. All rights reserved. Reproduc­ PEANUT SPAD XIII, J o h n W a lk e r ...... 46 tion without permission prohibited. Published monthly by MODEL BUILDER Magazine. 1105 Spurgeon, Box 4336, Santa Ana. Calif. 92702. Phone (714) 547-3963. Cover: The "Seasquare" is another in a long series of seaplane and flying boat designs Change of address notices must be received by George A. Wilson, Jr. One of the reasons that George concentrates so much on water- one month before date of issue that new type aircraft, is that it is only a short distance to the nearest "flying lake" from his home address takes effect. Send old address with in Walpole. Massachusetts! That this cover photograph was enlarged 13-1/2 times from new: old label preferred. Post Office w ill not a half-size 35 mm transparency, speaks well for the lens in George's camera. A construct­ forward copies unless you pay extra postage. ion article for the "Seasquare" begins on page 9. D uplicate issues cannot be sent. Second Class postage paid at Santa Ana, Ca. MARCH 1976 5 0 / / /

N o r t h r o p ' * Behind every successful magazine, there's a woman .. . pushing, pushing, pushing! Here are two well-known "pushers" in the model airplane magazine business; Anita Northrop, of MODEL BUILDER, and Grace DeFrancesco, of MODEL AIRPLANE NEWS. The gals were photograph­ w o r k b e n c h ed during a strategy meeting at the Las Vegas R/C International Championships by Don Fullmer of Montesano, Washington. • · · PROPOSAL TIME . . . PLUS 15, 1976, a little better than a month model flying is the very non-scale speed • In the January issue, we mentioned after completion o f the Nats. of most models. The least offensive is the fact that proposals for possible rules Speaking of Nats, as most everyone F/F scale, and the worst is R/C. Of changes in AMA model competition for now knows, it’s to be in Dayton, Ohio, course, it all relates to the comparitive 1978-79 must be submitted before June on Aug. 1 through Aug. 8, 1976. R/C wing loading o f various types of models 1, 1976. We also mentioned that this and C/L will be at Wright Field, Dayton, . . . the heavier the loading, the faster a was an impossibly short time after the while free flight will be at the airport in plane must fly in order to maintain 1976 rules changes went into effect, to Springfield, about 20 minutes away. As flight capability. be able to discover needs for new pro­ usual, indoor is "o ut of town” , this time In the last couple of years, more and posals and still get them posted on in Columbus, about 1-1/2 to 2 hours more scale modelers are becoming con­ time. In some parts of the country, away by car. We have more detailed scious o f scale speed, though as yet, there will be almost no trial of new info on the R/C schedule in "Remotely nothing has been done to establish 1976 rules before the current proposal Speaking” , as supplied to us by Dave recognition for this in AMA competi­ deadline time. Brown, who attended the Nats planning tion rules. We are pleased to note, We’re glad to see that other respon­ meetings. however, that for the June, 1976 R/C sible modelers are putting their thoughts and C/L World Championships in on this matter in writing, and sending IMPORTANT NOTICE Borlange, Sweden, contestants are being There is an important correction in the requested to state on their score cards them to AMA Headquarters. Almost Control Line column, on page 33. We would all are suggesting a proposal deadline like to call it to everyone's attention. the cruising speed o f the full size aircraft sometime after the 1976 Nationals. We they have modeled, in addition to the heartily agree with this idea, and would SCALE SPEED exact scale relationship of the model. like to pinpoint the time as September One o f our pet peeves about scale Continued on page 93

I 1 i i A FREE SUBSCRIPTION TO WIN MODELS VI 111 BUĚLQER/ 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 o f any the earliest postmarked letter about that knife set. hobby shop in your area that does not dealer, you win the free subscription . . . Send references to: carry MODEL BUILDER. We will then for yourself or the person you name. If MODEL BUILDER, Dept. D, give them our sales pitch, and if they you already subscribe, you may choose Box 4336, Santa Ana, Ca. 92702, become an MB dealer, and if yours is to substitute an Uber Skiver precision or phone (714) 547-3963.

6 MODEL BUILDER OVER THE COUNTER

The 1" scale General "Aristocrat" by Flyline Models.

• The Sterling Waco SRE mentioned in wheel pants are also included. The the Golden Era’s greatest aircraft. The last month’s 'Over the Counter” is now Waco SRE will retail for $64.95. kit features Flyline's usual high quality a reality. This 56 inch span R/C (or Sterlings entry into the Peanut Scale wood, precisely printed, along with a control-line) cabin biplane recreates one market with three double kits is followed sheet of highly detailed plans. The of the most popular of the cabin by a logical accessory . . . a rubber Aristocrat can be built for gas, electric, biplanes of the ‘30s. The kit features winder. The Sterling winder is molded or even rubber power, for a distinctive dic-cut wood, formed landing gear and of nylon and provides a 5 to 1 gear scale plane that will fly well. The $12.95 aluminum engine mount, as well as all ratio. Compact, efficient, and inexpen­ General Aristocrat kit is available from necessary control linkage hardware. The sive . . . only $2.95. The Sterling line dealers or direct from Flyline Models, molded plastic cowl has molded-in-place is available at hobby dealers everywhere. 10643 Ashby PI., Fairfax, Virginia, dummy engine cylinders, and molded * * * 22030. What do you do to improve a line of classic free flight scale kits? Add yet another! Flyline Models is now shipping its General Aristocrat. This 36 inch span, .020 powered F/F (which can be converted to R/C) is a model of one of

The Flite Lite, for voltage monitering, by Steerlable, sprung tailwheel assembly for "Stay-Tray" by Applied Design Corporation. Advanced Devices, Inc. large R/C taildraggers, by C.B. Enterprises.

MARCH 1976 7 Javelin II, 134" R/C sailplane by JP Models.

* * * ideal to have at contests, providing a balanced rudder. The wing mount is a Stringent noise reduction require­ clean, organized work area for cleaning unique combination o f the best features ments for FAI competition prompted your powerplant after working it in the o f plug-in and rubber band-οπ wings. the design of the new FAI model dirt. The Stay-Tray makes an ideal The wings plug onto a basswood center muffler from Semco Model Engineering. bench top accessory for working on any block which in turn is held onto the This closed type m uffler is machined small parts project. It is marketed by fuselage with internal rubber bands. The from aluminum, with the body tube Applied Design Corporation, 5531 JP Javelin II is available from hobby anodized black. A muffler pressure tap Shoreview Drive, Palos Verdes Peninsula, dealers or direct from JP Models, is insulled for pressurizing fuel systems. California, 90274. Retail price is $1.98. 26557 Mazur Drive Dept. B, Palos The Semco FAI m uffler is available in * * * Verdes Peninsula, California, 90274. two sizes to handle engines from .29 to After over a year of testing, modify­ Price is $69.00. .80 displacement, in either bolt-on con­ ing, and retesting, the Javelin II sail­ * * * figuration, or for use with the standard plane by )P Models is finally available. Advanced Devices Inc., Box 152, Semco adapters. The bolt-on style sells This 1 34 inch competition sailplane uses Rockville, Maryland, 20850, is manu­ for $13.95, while the adapter version the same type rolled plywood fuselage facturing a voltage monitoring device retails for $12.95. Both are available as made popular by the other kits in the for R/C transmitter and airborne bat­ from hobby dealers or direct from JP line. The fuselage comes absolutely tery packs. The Flight Lite is a visual Semco Model Engineering, 14 Water St., ready to use with a tough white epoxy indicator light that goes out before the Waltham, Mass., 02154. finish. With its molded fiberglass nose batteries reach a critical low voltage. * * * cone, this type o f construction makes The Light Emitting Diode (LED) indi­ One of those “ Why didn’t I think of for an extremely rugged sailplane. The cator mounts through a 1/4 inch hole in that” products is the Stay-Tray. This is wings can be built in three configura­ the fuselage side, acting much like a gas a molded plastic tray with ridges on one tions . . . straight Vee dihedral, con­ gauge on a car, to show the condition side to hold tools in place, and a ventional polyhedral, or with curved o f the batteries. The Flite Lite is avail­ separate flat area for small parts. One eliptical dihedral. The plans show how able in a standard version for flight ideal use for the Stay-Tray would be to build a simple curved building board packs without plugs for $6.95, a deluxe for disassembly of engines. The poly­ for the elliptical dihedral. The kit comes version with Kraft or Deans connectors ethylene plastic is chemical resistant, complete with all hardware for rigging for $9.95, or a 9.6 volt transmitter making it easy to clean. It would be the all-flying stab and dynamically Continued on page 88

Saloma, 100" R/C sailplane by Hi Johnson Model Products. Semco Model Engineering m uffler meets new FAI requirements.

8 MODEL BUILDER The "Seasquare" is appropriately named . . . it flies off the water and it IS square. It is also a very practical flying boat, and handles well on or off the water. Plans also show how to equip it with trike gear for operation off land. š SEASQUARE ^ By GEORGE A. WILSON, JR. . . . The author is one of the foremost designers of seaplanes and flying boats that really operate well from the water. The "Seasqure" is an economy size craft for 3-channel radios. • The Seasquare is a functional Flying cycle gear. functional. Boat for novices and experts. It has the • Tee-Tail to minimize water accumu­ PERFORMANCE following special features: lation on the stabilizer. Seasquare’s hull is a radical design, • Ease of construction. • Simple, removable water rudder. and during the drafting and construc­ • Small size for ease of handling and • Ample rudder and elevator area for tion phase o f the project we considered minimum cost. aerobatically inclined. keeping the Seasquare in the secret clas­ • Rugged construction. Seasquare is a strictly functional fly­ sification in case it was a failure. How­ • Excellent water handling: the wing is ing boat that builds easily, flies well and ever, fears and concerns were unwarran­ close to the water. handles on the water with ease. If it ’s a ted! Without qualification, Seasquare • Minimum spray in the propeller be­ bit square to your eye, you’ll appreciate has the best water handling character­ cause o f the broad bow. this characteristic when you are putting istics of any seaplane model with which • Watertight compartment for R/C it together. The Seasquare has no com­ we have ever had experience. equipment. pound curves except for the wing and Powered with an OS. 19, and into • Convertible to a land plane with tri­ stab tips, and its simple curves are all about a 5 mph breeze, it is up on the

Seasquare is extremely stable, and easy to fly. A .19 R/C engine is The wide bow keeps water out of the propeller path, thus avoiding sufficient for power, if weight is kept at 4 pounds or under. loss of power during takeoff. Hull rides on planing skids at speed.

MARCH 1976 9 Engine pod is simple and open, makes things easy to get at. Note Underside photo shows demountable gear for land operation. Planing throttle control cable and exhaust deflector, also hatch cover. skids add a great deal to water handling at high speeds. step as soon as full power is applied, characteristics are good and compare slowing down the motor. and in the air within 20 to 30 feet. It favorably with the performance of train­ The hatch is thoroughly waterproof. taxis well at low speed, with the hull ers with flat-bottom wings. Again, the But, we do admit to putting a patch of displacing water, and is a joy to watch concerns that existed before flight tests Silray over the nose-gear entrance hole as it moves along on the two planing were unnecessary. The flat top and bot­ to keep water out o f the hull. Don’t for­ skids at high speed. During design, these tom of the hull does not seem to cause get to put the main gear screws into the skids were added with the attitude that any tricky flying problems. Wind pene­ blind nuts in the hull before you go they would protect the bottom even if tration is good, and was a necessity dur­ waterflying! they were not functional otherwise. In ing the first test flight (As usual, we KITTING fact, we feel that these skids contribute couldn’t wait for good weather!). Tran­ If you are an experienced scratch greatly to Seasquare's water handling. sition from power-on to glide is gentle, builder you will be acquainted with the As a seaplane with an OS. 19 in­ and landings flair out easily. savings in time that result from kitting. stalled, the original Seasquare has an During the design work, we were If not, let me urge you strongly to cut all-up dry weight of three pounds 13 sure of the side hull's ability to keep out ribs, bulkheads, hull sides, etc., etc. ounces. With land gear installed, the water out of the propeller. We were before you start construction. This pro­ weight increases to four pounds five more than pleased with the actual per­ cess should even include cutting the ounces. The wing loadings are 17.6 and formance. It is the author’s conclusion wing spars and leading-edges to length 19.9 ounces/square foot respectively. that a wide hull with flat (or near-flat) and cutting as much o f the wing and With the CG about 1 /2 inch ahead of bottom is the most effective answer to rudder sheeting to size as can be done the location shown on the plan, flying the power-robbing problem of water without actual fitting. This process will

We don't like to put the Seasquare down, but the author/designer's Control to the "T "-tail elevator may be exposed, but it sure is the wife, Eleanor, is the prettier model in this photo! easiest and most positive way to go. Sea rudder has been detatched.

10 MODEL BUILDER

Most of this month s photos were taken at the Chicago Scalemaster's Seventh Annual Rally, in August. Photographer Larry D’A ttilio did an ex­ cellent job. This is Mike Ilyin's 3rd place B-17 taking off .. . complete w ith scale mud spattering up from the wheels!

soaring event. At this point in time, no unofficial helicopter event has been scheduled. Hopefully by next month, we will have more positive information to R/C News, by BILL NORTHROP convey. • Being in a much more densely popu­ combined trophies in Novice, Advanced, HOW NOW BROWN COW? lated area of the country for the first and Expert. There will also be four Ever hear that little line? It comes time in four years, the 1976 Nationals rounds o f finals, for all classes; three on from a poem. We don’t know the name will undoubtedly be the largest since Friday from 2 to 8 pm, and one on of the poet, or the title o f the piece, but the last Chicago Nats in 1972. Saturday, from 1 to 4 pm. the phrase has been used in diction and Although plans are still in a prelim­ Pylon will be run for six days, from grammar exercises, particularly to show inary stage at this time, the following 7:30 am to 1:30 pm, with three days how emphasis can change the effect. brief outline o f the schedule is probably each for Quarter Midget and Formula I. “ How ... now brown cow?” not too far out o f line. Most of it was Scale, both AMA and Sport, will be “ How now ... brown cow?” passed on to us by Dave Brown, who flown on Saturday, from 4 to 8 pm, and Is an Indian saying hello to a brown attended the planning meetings. Sunday, from 8 am to 2 pm. It is cow? Maybe a young bull has just been There will be four days o f qualifying believed that both classes will be flown turned loose in the pasture for the first in Pattern, for all o f the four new classes, together. time, and is taking the direct approach. from 2 to 8 pm each day. Trophies R/C Soaring will be flown at the Who knows? will be awarded to 10th place in each free flight site, the airport in Springfield, Anyway, all o f this is leading up to of the four classes, and in addition, Ohio, on Thursday and Saturday. As of the fact that some statements can be there will be separate Junior/Senior now, it appears there will be no scale quite clear to the person who writes

Bill Hatcher's 1-1/2" scale F2G Corsair was not flown at contest. It is covered with sheet alum­ Oops! DH-4 by E. Betinis tries to bite the inum and $70 worth of Sig rivets! (Shouldn't they be flush?) Ship weighs 9 pounds. concrete. Good scale subject.

14 MODEL BUILDER

Another look at Bill Hatcher's F2G Corsair. A beautifull job of aluminum sheet covering. We'd Mike llyan's B-17 on a leaflet mission. Ship like to more about his technique. Pilot seems to be a little small in scale size. flies at very close to scale speed. Must be light. by AMA members, processes them, puts them into rule book language, and makes them official or throws them out, in accordance with the desires o f AMA members. When these rules are vague or not well thought out, then the Board must make interpretations, based on whatever rules are available at the time. If these interpretations don’t meet the approval o f the majority of the membership, then it behooves the members to make proposals that will provide rules that don’t need interpreta­ tion. In regard to the latter discussion, Ed Guzick's P-51B taking off. Another fine photo; Normal, or scale eye-level angle, and by op­ there has been a lot of flap about the ening lens and panning with model, background conveys feeling of plane's motion. D 'A ttilio pic. legalized Rossi engine, mostly from those who don’t happen to own one. As time goes on, the flap has decreased in a direct ratio to the number of QMers that don’t own Rossi’s! Don Belote, co-director of the fabulous Toledo R/C Exposition, made a good point about this in a recent letter. Don points out that the argument about the high Rossi price tag o f S83.95 is kinda ridiculous. He bases this on the fact that in the long run, the cost of one or two Rossi's, which run better and last longer, will be much less than the cost o f numerous less expensive engines that wear out quickly, and even while they’re new, don’t run as well. And once again, we’d like to explain that in spite o f numerous requests to do so, AMA cannot put a price ceiling on the cost o f competition equipment. This would be the equivalent of telling a manufacturer or importer how much he could charge for his product, or it would be like telling modelers that they must boycott a product unless the price is lowered to a certain level. In either case, the resulting lawsuits would come thick and fast!

Mel Ford and his Etrich Taube w ith working wing-warp control, as seen at Flightmaster's scale LEGAL DESTRUCTION meet, Sepulveda Basin, Los Angeles. Excellent flier. Photo by Bob Angel. R/C Sailplane rules are “ soarly” in

16 MARCH 1976 Bob Lillie and his Pitts Special at the Chicago Ran out of space last month and couldn't include this shot of Bill Hemple, Sr. pitting for Bill, Jr. Scalemaster's contest. He placed second. at the Tucson Winter Nats. Bill Jr.at age 10, flies a mean QM race with ST powered Bearcat. need o f some type of control over the contest director to prevent a contestant are counted. Ludicrous! quality of landings in which points may from deliberately . . . or mistakenly ... In many of the better R/C soaring be earned, specifically time-precision launching a plane into flight which is contests, CD’s have announced before and spot. In the former case, it is quite possibly unsafe because of damage the start of competition that if a glider important to make first contact with sustained in a previous flight, or because is damaged during a landing to the extent the ground at a precise moment in of poor workmanship that makes the that it cannot be flown again without time, before or after which, points are model unsafe for the type o f flying it is repair, the landing points will not be lost. In the latter, it is important that supposed to do. Rule 17.1 contains no allowed. If this is not announced, then the nose of the glider comes to final penalty for the way in which the damage 10e is the only control over landing (and upright) rest as close as possible to was inflicted, and once repaired, the quality. a given spot on the ground. In many model may continue in competition. To be facetious for a moment . . . contests, there are tasks assigned that In R/C soaring rules, the only Under the existing written rules, glider require both of the above in the same reference to landing quality is lOe, which fliers should attach two foot lengths of flight. states that no landing points shall be string to the fuselage and to each part of Unfortunately, competition soaring awarded if the model loses non-jettison- the model that might detach itself in a is “ progressing” more and more toward able parts during landing, or if the model crash landing, such as plug-in wing deliberate, controlled crash-landings to comes to rest in an inverted position. panels, plug-in stabs, and canopies. Then accomplish one or both of these require­ This means that even if the model’s if any of these parts come o ff in a ments. And just as unfortunately, there seriously broken in a landing, as long “ landing”, they will still be “ attached” is nothing in the R/C soaring rules to as the broken parts remain attached to to the model and landing points will prevent this backward progress. General the rest o f the model, the landing is not be lost! Why not? The situation’s AMA rule 17.1 is designed to allow a considered acceptable and the points pretty ridiculous anyway. ·

"Putty, putt, putt." Bill Rohring's Aeronca C-3 comes in for a landing at the Scalemaster’s Annual. "C ’mon, Bill, get that left wing down!"

MODEL BUILDER 17 “IS SOARING FOR THE BIRDS?’’ By JIM GRAY . . (Part 2): Continuation of a series on birds that soar, and what we can learn from them. Required reading for R/C sailplaners.

what kind of soaring is this that seems trol could be used to teach us a lot so different from ordinary slope or ther­ about this as yet unexplored form of mal soaring? soaring for the sailplaner. I think that I believe that the answer lies in a very high wing loadings would be re­ type o f soaring called “ dynamic soar­ quired, as well as the availability of ing", wherein the size, weight, penetra­ these shear forces in the wind. Typi­ tion and high L/D o f the albatross en­ cally, the air should not be affected by • Land soarers have wingtip pinions, ables it to exchange potential for kinetic thermals, the flow should be laminar usually seven in number, these are the energy by using wind velocity gradients and the wind strong . . . the sort of a primary flight feathers or “ fingers” of in a shallow band or sandwich of lift day when orographic waves exist in the the bird. The pinions are almost per­ close to the ocean’s surface. His high atmosphere and when the lapse rate fectly aeroelastic, and appear to be wing loading helps the albatross over­ may be low. spreadable and even rotatable by the come minor turbulence effects, while bird. The late August Raspet, Chairman GEOMETRY AND STRUCTURE OF his weight creates a favorable momen­ SOARING BIRDS’ WINGS of the Aerophysics Department o f Missi­ tum which carries him through the gusts ssippi State College, measured the drag Even a qualitative analysis of the without much displacement. It’s a lot structure, aerodynamics and geometry of vultures’ wings in wind tunnel experi­ like a bowling ball and a balloon o f the ments, and often soared among these of the wings o f a soaring bird is a very same size being exposed to a high wind. risky undertaking for me, but I’ll pass birds in an experimentally equipped re­ The balloon is at the wind’s mercy, search sailplane. He found that the tip along a few o f my thoughts, ideas and while the bowling ball is unaffected. Of opinions, hoping that someone who pinions, when open, reduced the bird’s course, I ’ve never tried to soar a bowl­ drag by minimizing the wingtip vor­ really knows about these things will ing ball, but I believe the principle is step forward and set me straight. texes. Instead of one large vortex, the true. pinions produced smaller and less vigor­ Perhaps the fundamental and first In latitudes where the trade winds ous ones which totalled less than the question we ought to ask ourselves is: exist, the air far out at sea is quite lami­ large one. Thus he found that buzzards, "Can we as R/C sailplane modelers and nar in its flow behavior. For long vultures and virtually all land soarers fliers ever build machines as adaptable months o f the year, these trans-equa- which possess these pinions have higher and responsive to lift as the best soaring torial winds blow across thousands of effective aspect ratios than their geo­ birds?” The next question should then miles o f open sea, having all their minor metry would seem to provide. Here, be: “ Do we have to?” It is obvious turbulences and “ wrinkles” ironed out again, is one of nature’s compensations. that the second question can be answered of them. They are essentially laminar Dr. Hoerner, in his mastcrwork, easily, and the answer depends upon and, at the surface, their velocity may “ Fluid Dynamic Drag,” provided some how easily you can be satisfied and be only ten miles per hour, while at al­ insights into wingtip shapes for pur­ what you wish to accomplish. With titudes of 100 feet or so they may blow poses o f drag reduction. It would be of performance comes a price, and some­ at forty miles per hour. In this shallow great interest, I should think, if some times that price is too high to pay. I band of wind, which has a velocity experiments were made using the "buz­ believe that the answer to the first gradient or shear o f perhaps as much as zard tips” on one wing o f an R/C sail­ question is a qualified yes at present, 25 or 30 m.p.h., the albatross can fly plane and “ Hoerner tips” on the other, and a probable yes-definitely for the for comparison purposes. A static test for hours, scarcely flapping. In the future. could easily be made with a household exchange o f potential for kinetic ener­ GEOMETRY fan, merely by taping a piece of ribbon gy, the bird’s drag losses are compen­ The wings of soaring birds have some sated by even the slightest vertical com­ to the tip and watching it rotate in the remarkable attributes, and I would rate breeze. The faster the rotation, the ponent of lift, such as may be provided flexibility at the top o f the list. This “worse” the vortex. The object of over a large wave, for example. Gliding includes aero-elasticity. A soaring bird downwind the bird picks up airspeed course is to design a tip which permits can, at will, alter the shape o f its airfoil and “ groundspeed” as it approaches the the tip to “ fly ” without rotating the from undercamber to reflex and posi­ surface. Just above the waves it wheels ribbon at all. tions in between, by merely exercizing into the wind, acquiring initial lifting The albatross ranges far at sea and ap­ the appropriate muscles during flight. acceleration from an increase in wing pears to use a type of lift that is either The planform can be altered from incidence and angle of attack. As the unavailable or not capable o f being used sweep-forward to sweep-back, and all bird rises, it encounters ever higher by land soarers. Sometimes an albatross intermediate positions; and dihedral can seems to find lift in the turbulence gen­ wind velocity, thereby maintaining its be changed from positive to negative erated by the superstructure of a ship, airspeed and rising to the altitude from over a range o f perhaps forty-five degrees. effortlessly soaring back and forth in which it first descended on its glide, Each wing is jointed at "hand” , "elbow” , the “ turbulence wake” . At other times, without expending any internal energy and “ shoulder” , and the angle o f inci­ albatrosses seem to make a game out of except perhaps enough to alter its wing dence o f each wing may be changed flying in a series of undulations or por­ airfoil shape and incidence angles. I’ve simultaneously or independently with poise-like dives and zooms. Frequently, seen a few land birds make use o f hori­ respect to that of the other. To simplify they fly in circles which are inclined to zontal velocity gradients, but only things we won’t even consider the flap­ the surface of the ocean; that is, a gra­ rarely, and not for long. ping mode. It is a fact, however, that dual climb to an altitude o f 100 feet or The modern R/C sailplane flies with nature practices economy in some re­ so, followed by a dive to the surface, a sinking speed that approaches one spects, and does not provide perform­ and another climb. Each climb and foot per second; that is, in a range ance in excess of that needed for a dive has a reversal o f direction at the where dynamic soaring is or should be species to survive, or at the expense of end, which gives the appearance o f in­ possible. Sensitive telemetry of lift of some other requirement of the bird. clined circles. How is this possible, and conditions and good positive radio con­ Continued on page 89

18 MODEL BUILDER V :J In memory. John Keller (deceased) was winner of the first SCAMPS Texaco event at Taft. Winning model was the PB-2. name club), Al Heilman (SCIFS), and Tom Bristol (SAM 21), the meet was held on December 14 at the Tri-Valley R/C Field in Santa Maria. John Le Seur was the going spark plug here, and what p m m m a wonderful time he provided for all! For openers, John set up reservations for all at the Holiday Inn. He then ar­ By JOHN POND ranged for a real great dinner at the ' / F r Howard Johnson hotel. The dinner fea­ • As Mark Twain put it, “ Reports of the old boy is still kicking and doing his tured organ music during the meal. Prior my death were greatly exaggerated.” usual raucous grumbling. Good thing to that, during the “no-host” cocktail Despite the terrific amount of publicity they didn’t name the meet the Pond hour, Red Barrows set-up his video tape generated for the John Pond Commen- Memorial Contest! to play through the local television set. orative O/T F/F Radio Assist Contest, Organized by Red Barrows, (No­ This featured some of the “outstand-

A quickie conversion to throttle control for an ignition engine in a Say goodbye to Bob Von Konsky's Lanzo Record Breaker! Ignition radio controlled old timer. See the text for details. Webra ran 10 minutes on 1-1/2 oz. of fuel during flyaway flight.

MARCH 1976 19 "Hello, Mable? I’m going to be late for dinner tonight." Nick Rankin's Bombshell , in Idaho. in so many events that he eventually ran out o f transmitter power. With no signal, the Clipper promptly demolished itself. Gerry is now interested in a DalI- aire, for real performance. Tom Bristol, the Co-CD of the meet, found time to win Class B and place second in the Texaco Event. Somehow or another, he never got around to Class C, which was won by Roger Larson of the local Tri-Valley Club. Surprisingly, Red Barrows placed third, using his big nine foot Dallaire in a 20 second event. Who sez those big ones won’t climb? Pond was accorded the honor of handing out all the prizes, consisting of gorgeous trophies and loads of merchan­ dise. Otto Bernhardt was awarded the huge Pond perpetual trophy for out­ standing flying. Next year it will be awarded or a Sweepstakes trophy, so beware o f fellows such as Tom Bristol and Red Barrows! Much to the delight of all, there were actually a few mer­ ing” flying that was accomplished by over the surrounding farms. However, chandise prizes left over. These were the old man while he was associated things warmed up in a hurry, and good promptly donated to the Tri-Valley with Red Barrows and the San Diego flights started coming in right away. Club for their next contest, in view of gang. The most popular event, the R/C the tremendous amount of work ac­ For those not familiar with Red Bar­ Texaco, pulled fifteen entries despite complished by John Le Seur and Co.! row ’s setup for TV tape photography, the lack of many familiar faces (yeah, Next year’s contest will be moved up Red would take pictures all during the you too, WCN!) (Stayed away to give from December, probably to September day’s flying. Around 3 o ’clock in the you a chance to win for a change, John, or early October. You couldn’t actually afternoon, the gang would adjourn to wen) Much to the columnist’s delight, complain about the weather too much, Red's place to view the day’s activities Otto Bernhardt found a beauty of a as the rain clouds had disappeared, but on TV via the video tape. Talk about thermal for 35:36. The nearest to him everyone agreed they would have liked fun in being able to relive the day’s fly ­ was Tom Bristol, with 20:57 . . . and the contest better in warmer tempera­ ing. Every modeler should have one! 14 minutes o f that was engine run! The tures. Look for the date in this column, Directly after the meeting, Al Hell- Merco 61 ignition conversion really we’ll have it! man traced the history leading to the shows its fuel economy. Al Heilman EUROPEAN SCENE formation o f the annuals, and acknowl­ managed to squeeze in a third on his Just had a long talk with )im Gerard edged all those who had so unselfishly well known Flying Quaker. Incidentally, of Sunnyvale, who visited most every worked to make the meet a success. for those who don't think the GHQ engine manufacturer and collector he This was followed by the 16 mm color Sportster can fly, Bruce McAvinen was could find while abroad in England, films taken by Bob Bowen, o f the ori­ up there with a flight of 12:31! France, Belgium, Denmark, Sweden, and ginal Stockton Old Timer Meet. These Gerry Wolfgang had his first try at Switzerland. are a great record of what started this flying old timers. His R/C gliding ex­ Jim was able to pick up a four cylin­ whole thing. perience came in real handy, as he der Micron engine (a mere $400.00!) Sunday morning dawned bright, pulled a third place in Class B using a and several other scarce items. He also clear, and cool, with plenty of frost all Comet Clipper. Gerry flew the Clipper brought back numerous catalogs of 20 MODEL BUILDER Typical Swedish O/T glider design, by N.O. Gustavsson, called Nice flying Scientific Commodore, built by Bruce Gale, a few years "Sailplane." Wonder why? back. Was a fixture at all Northwest O/T contests.

French, German, and Swiss products. If fied, it was a slight bit over .60 (.62). for the SAM 21 Club to stage the R/C you are interested in getting some info The motor was provided with radial assist Texaco Event, following the con­ on those hard-to-get foreign items, and mounts only, although later on, custom- clusion of the standard free flight Texa­ don’t know where to write, try Jim at made mounts were manufacturing to al co (This writer is going to have a ball 1350 Phyllis, Ml. View, Ca. 94040. low different methods of mounting. and enter both contests!). ENGINE OF THE MONTH TEXACO To help entries, the BOM rule will Late in 1936, all modeling in Los As has been written in this column not be enforced, however, the model Angeles was agog with rumors of the many times, the originators of the Texa­ may be entered only once. Two flights hot engine Irwin Ohlsson was putting co Revival, the SCAMPS, are again put­ allowed, with the first flight being re­ out. This engine was called the “ Minia­ ting on the Tenth Annual Texaco Event quired to start by 12 o'clock. The con­ ture” and sold for $18.50 (Brown Jr. on April 11 at Taft. test w ill close at 3 P.M., with no model was $21.50). Flown now as the “ Dawn Patrol” taking off after 2:30 P.M. Now don't From its humble start in a garage- with Sal Taibi doing the officiating, the say you didn’t hear about it! type operation, Ohlsson, and his part­ contest begins at the crack o f dawn GUTS OR NUTS? ner at that time, Frank Bertelli, moved (around 6 a.m.) and concludes at 9 a.m. When Bud McNorgan and son, Kit, their operation to the Alvarado Street Nice thing about flying in that real calm decided to return to Old Timer models, plant. This was the first major step for air at that time of the morning is the it didn’t take Bud very long to come up Ohlsson in engine manufacturing. lack o f flyaways. Real pleasant flying! with the wildest idea o f all. At that time, Irwin was sub-contract­ In line with this event, Sal and the According to Editor Jimmy Dean of ing a considerable amount of machine SCAMPS have given their approval the SCAMPS "H ot Leads” , McNorgan work to Harry Rice. Several factors led (through the efforts of Otto Bernhardt) has issued a challenge to all old timer to Bertelli leaving the firm and it was only a matter of time until Harry Rice became Ohlsson’s partner. With the James engine (as manufactured by Rice) fading and Ohlsson needing a real pro­ duction man, it was a natural meeting. The first miniature engine featured a duraluminum head produced in con­ junction with Frank Bertelli. Only 126 aluminum types were manufactured, making this model a real engine collec­ tors item. This “original” was a “ two- bolt” type, that is, the exhaust manifold was held on with two bolts. Open type ignition points were a distinctive fea­ ture of this engine, as were the cooling fins which formed the famous “ step-fin” head. All miniatures featured these char­ acteristics. The dural model was followed by the “ two-bolt” steel head and cylinder type. By the time this model arrived, Harry Rice was in charge o f production. In­ terestingly enough, the first tanks em­ ployed on these motors were modified brass carburetor floats which adapted admirably to the miniature engine. The engine, with a 7/8 inch bore and 15/16 inch stroke, was nominally rated at 1/5 H.P. (similar to Brown Jr.). A l­ though the displacement was not speci­ MARCH 1976 21 22 FULL SIZE PLANS AVAILABLE - SEE PAGE 94 MODEL BUILDER Hark Stumpf of Long Island, built this sharp looking Bay Ridge A rare New Cyclone Co. "Lancer 72", built by Ron Raddon, Barnet, Mike. Look at the trees in that flying area ... ouch! England. Looks somewhat like a Shereshaw design. fans in the form of a meet called “ They As Brickner of the SCIFS observes, However, Flightplug Editor Brickner Went Thataway” . This former dynamic “ They may call this meet guts, but I thought that was such a good idea he SAM Director (who practically single- call it nuts!” We’ll keep you clued in on repeated the incident. There must be a handedly organized the first series of this one occuring on January 18. flock of models in those hills surround­ Denver SAM Champs) puts out the fo l­ DECEMBER CONTEST ing Elsinore! lowing rules: Seems hard for the rest of the coun­ The writer was rather pleased to see Any old Texaco type model can be try to believe, but the SCAMPS held an Brad Levine, a young newcomer to this entered. To enter, all one has to do is to ,020/Rubber Combination meet at Lake game, walk away with the rubber event put a five dollar bill under the desig­ Elsinore in December, with three fly o ff and also the Yearly High Point Trophy. nated rock, and let 'er go! One flight is flights required to settle the .020 Repli­ These 36 inch rubber jobs do fly very all that will be allowed. No fuel limits, ca Event! Weather was in the sixties, well! no flight time limits. As McNorgan puts with about a 5 mile wind. WOW! The new event, as originated by the it, “ Here is a chance to retire (or lose) One feature of the contest was Jer­ SCIFS, .020 Antique Replicas, enjoyed your old model” . Anyway, the one ry Vernon losing another model, an a good turnout this time with 12 entries. longest flight wins what is under the .020 Interceptor, this time. Full tank Maybe this writer will have to eat his rock. and timer o ff seems to be Jerry’s bag. hat after all! „ . , Continued on page 65

AIR TRAILS TRAINER- OLD TIMER Model of the Month Designed by: Gordon Light (?) Drawn by: Chuck Blackburn

Text by: Bill Northrop • Bud McNorgan, Garden Grove, California, and his "Trainer." He added a DT hookup, and also installed a motor peg in place of the rear hook. Plane flies extremely well. • This little rubber ship was published in the May 1936 issue of Bill Barnes Air didn’t like it! was a firm believer in this method of Trails (10 cents at your newsstand). It “ The rubber motor runs through the carrying the rubber.) was billed as “ The TR AIN ER ” , and it fuselage and is attached to the front and “ Another feature of this model, new had no claim to fame whatsoever. The rear o f the fuselage instead of being to Air Trails followers, is the wire only thing we know is, it’s damn cute, mounted to a motor stick. With such an landing gear.(!) Its chief claim to fame and one that we’ve always slopped to arrangement, the fuselage itself must is its flexibility. We still favor bamboo look at over the years, whenever thumb­ stand the strain of the wound motor. for landing gears. Let’s see what you ing through our treasured collection o f Naturally, this distorts the fuselage and think.” old model magazines. makes the safety of the model dubious Light’s concern about the fuselage It’s sort of a puzzler in a way. It was when the rubber is tightly wound. But strength was needless. Bud McNorgan’s apparently designed by Gordon Light, an 8-strand motor, as used in the Trainer, “ Trainer” is an excellent flyer, and the who “ conducted" the Model Workshop will not cause too much trouble. At fuselage does not “ distort" or look portion of Air Trails for many years, yet least it will show you the advantages of “ dubious.” he picked it apart in the introduction to using a motor stick! (Light’s 1935 Wake­ In fact . . . like we said . . . it’s just the extent that you’d almost think he field winner used a motor stick, and he damn cute! · MARCH 1976 23 quit after 10 seconds o f running. Sub­ sequent attempts to keep it going were to no avail . . . we kept unscrewing the needle valve (it was starving from lack of fuel) until it finally came all the way out, hit the prop, and went sailing o ff into the wild blue yonder! Well, that killed it for Saturday. We picked up the gyro and took it back to the shop for further checking and a new needle valve. As he defueled the tank, Kim said the only thing wrong was that it had no fuel in it . . . O f course I had filled that 16 ouncer to the brim, so HELIX AUTOGYRO a fun day! There was quite a crowd at what was wrong? Sure ‘n uff the fuel • We concluded last m onth’s column the field when we finally arrived, all tank was empty . . . 16 ounces of K&B with having just completed building the anxious to watch the strange contrap­ 500 had dribbled out of a hairline crack “ Helix” autogyro and were ready to tion fly. (in a new tank) and was still trapped in begin flight testing. The night before The first step was to wind up the the belly o f the ship! we took it out to the flying field, Kim string on the starter spool, fill the tank It didn’t take too long to clean up painted on some sexy stripes and out­ with fuel, and start the engine. The the mess and install a new tank, so we lined the entire bird with black trim, moment it burst into life, the string made plans to try again on Sunday so it would be quite visible in all unwound from the spool and we shut morning. The preflight went well, the regimes o f flight. down to wind it up again! engine ran fine, and the string stayed on Saturday morning dawned as a perfect This time, we enlisted the aid of the spool, so we pointed her into the day... sunshine and warm temperatures, another helper to hold on to the spool! wind and crossed our fingers. I must say with no wind, all telling us it would be The next engine start was good but it that the takeoff and climb-out went

24 MODEL BUILDER exactly as the instructions indicated. Full power was applied and the gyro­ copter made a perfectly straight ground- run, the string rotating the main blades as it accelerated. Finally, when it reached the end, the string came o ff the pulley and the gyro lurched forward at high speed for another 15 feet, then gently lifted off in a smooth climb. Control was soft and easy to handle, however, I did have to hold in a very slight amount of left rudder to keep it straight. To be completely honest about it, I was so absolutely fascinated by the machine and the way it flew, I did the one thing you should never do with a helicopter, or a gyrocopter, that is, to let it get so far away that you lose visual reference, and ultimately lose control! IF YOU C A N T SEE IT, YOU CANT FLY IT! Well known R/C aerobatic competition flyer of a few years ago. Frit* Bosch, now representing Very soon, I realized it was approach­ Simprop Radio, of Germany, spent several days w ith our "Chopper" editor, John Tucker. ing the lim it of my vision and started a gentle left turn to bring it back into the the 5-minute epoxy used to join the his Jet Ranger. After tightening up a traffic pattern. Since the instructions leading and trailing edges had failed to loose timing belt, he fired it up right had cautioned that "a steep turn would penetrate very far into the balsa before there in his yard and wrung it out. He cause the rotor blades to stop and a setting up. Dave says the lesson here is made 360° turns where there was hardly crash would surely result” , I played it not to use a quick-setting epoxy for enough room to turn the lawn mower around the turn real cool. About half­ fabricating rotor blades, especially if around, and climbed straight up among way around, I lost contact with its the blades are not covered. Undoubtedly the lonesome pines with hardly enough attitude and position, so in desperation, an aliphatic resin glue like Wil-Hold or room to even see, to say nothing of made a tighter turn to bring it back Titebond would penetrate the wood flying a helicopter! He then blew the pine needles o ff his roof with the rotor toward me. Just like they said, the better and form a more satisfactory rotor blades suddenly stopped in mid­ joint in such critical areas. breeze! Aubrey's comment was, ‘With this much invested, I have to find some air and the gyro did the darndest * * * Lomcevak you ever saw, and tumbled We also received a newsletter from useful purpose for it ! ’ How ‘bout that for a colorful character?" end over end . . . all the way to the the Florida R/C Helicopter Association, * * * ground! I was so panic stricken, I telling of their Jacksonville Fly-In during Bud Ashcroft, o f Pomona Valley didn’t even throttle back the engine! November. Of particular interest was Hobbies, drove over for a visit last week Well, the fuselage was cracked in the following quote: and brought along his beautiful Jet several places, the windshield had disin­ “ On the way to Jacksonville, we tegrated and one rotor blade was broken. stopped at Aubrey Radford’s home and Ranger. Bud has really detailed this At this time, we have patched up the found him working in the backyard on Continued on page 75 fuselage and are now working on a new set of blades. Hopefully, we’ll have it in the air again within the next few days . . . this time I’ll let Kim fly it... his depth perception is much better than mine! I am convinced that gyro­ copters have a lot to offer to the sport flyer . . . they are economical to build (and repair), they fly like an airplane, and do not require the special techniques that helicopters do, and, they are much, much fun to maneuver. My hat’s o ff to the ” Skip Ruffs” who spend most of their time developing new gyrocopters and exploring this new and unusual segment of our hobby. LETTERS AND VISITS Dave Martin, of Fairfax, Virginia wrote a short letter telling o f an unusual situation with his Enstrom chopper. His helio was flying quite fast at 100 feet when he saw a white flash, heard a cracking sound, and instantly realized he had lost a main rotor blade, but still had reasonable control o f the model. A normal landing (except for vibration) revealed that the entire balsa trailing edge o f one main rotor blade was missing. Bud Ashcroft, of Pomona Valley Hobbies. Pomona, Ca., equipped his Kavan Jet Ranger with Examination of the pieces showed that control rod ball-link hinges on the cabin door, for realism and accessibility. Note interior detail.

MARCH 1976 25 R/C sailing in Paris .. . Paris, Illinois, that is. There's always something to be learned. The weather boat (far right) is over-trimmed for this leg, heeling more, and about to be passed by the Soling, to leeward. This, and other photos by Roger Bard.

idea over. Hopefully that undertaking will be well under way by the time these words appear in print. In an attempt to help cure the in­ formation gap, this m onth’s column is a simple run-down on the shelves o f my bookcase. Each book is listed by author in the bibliography at the end o f the column. Though lumped under different • Got a letter from Bob Danks of the by and large, old and not pointed d i­ headings, each book may contain ma­ HMS Bishop, a new AMYA sanctioned rectly toward R/C sailing. terial on more than one area, and its club, Box 1026, Bishop, California I also heard from John Rosebery, sec­ place in this text should not be con­ 93514. He asked for some suggestions retary for the Tri-State MYC, who has strued too restrictively. I merely sorted for reading material that would help recently been deluged with novices seek­ the books into groups based on how introduce new skippers to the sport. I ing help with their first boats. Though much use I have gotten from it. had to tell him that at present, one had AM YA has been approached to sponsor If you are interested in building a li­ to read about full-sized techniques and a project which would provide a series brary of your own, I would like to sug­ then transpose that to the models. The o f monographs with their Quarterly gest that old American tradition, the model yachting books available were, Newsletter, they are still working the book-club. In this case, it is the DOLPHIN BOOK CLUB, Camp Hill, Pa. 17011. You’ll find their ad in any of the monthly yachting magazines, and should take advantage o f their intro­ ductory offer. Speaking of magazines, I recommend in order o f importance to the R/C yachtsman, SAIL, YACHTING, and YACHT RACING. After you have re­ newed your MODEL BUILDER sub­ scription, add one of these to your list of required reading. You might collar two buddies and subscribe to all three, swapping each month. ROSS is undoubtedly the eventual bible of this area. The diagrammatic presentation makes it easy to picture his subject as occuring to your boat, so that you’ll recognize symptons in set and trim while sailing. Chapter 18 on measuring sails ought to be required reading for every race committee we have. Chapter 19 concerns itself with the vagaries of measuring sails under the IOR Rule that is presently used to rate "Did Fred mine the lake again?" full-sized ocean racers. Believe me, one look at that and you’ll be glad to go 26 MODEL BUILDER back to your one-design or 50/800. HOWARD-WILLIAMS’ two books are a bit more technical from the stand­ point of sail construction. I think that if the average model yachtsman knew a bit more about what goes into a sail, there would be more satisfied skippers on the water. The photographs o f sails full of air with various defects are quite valuable and should aid you in discussing your sails with your sail- maker. MARCHAJ, though over 10 years old, still remains the basic theoretical text concerned with sail aerodynamics. Each individual section is understand­ able by itself, well documented with vector diagrams. The problem comes in trying to integrate all the different sections and come up with a path to fo l­ low in handling your sails. I’ve seen a number o f skippers who read one small section, run out and take that recom­ "Last one home pays for the grog." mendation to excess on their boat, and not realize that tuning and design is a flat piece of paper. Calculations of dis­ duels which seem to arise so often on continual series of trade-offs. Something placement, center of buoyancy, and so the race course. My trouble is in finding that works well to weather, like a high- on, help the novice designer to quantify skippers who have taken the trouble to aspect sailplane, will not work well on a his design on the board. We will go into learn enough to realize that they are get­ reach or run. An all-round boat will not this further in the pages of MODEL ting “ lee-bowed” , for example. Most go to extreme in any part o f its con­ BUILDER as I find new designers who skippers are sadly lacking in elementary struction. However, MARCHAJ does al­ are willing to share their efforts with us. considerations of fleet or individual low us to look at each part of the hull/ In the near future we will be looking at tactics. I will admit that Schult seems to keel/rudder/sail system, and makes a the WING 50/800, design by Forrest be an entire barrage when a shot or two good volume to squirrel away in the Godby, of Mt. Kisco, New York. would be overkill, but here is another nightstand. KINNEY has brought Norman book which can be reread often with FLETCHER and ROSS, are two Am­ Skene’s design philosophy up to date continual profit. ericans who use photographs to great and produced a very handy reference PINAUD is a recent addition. It is a advantage to cover a plethora of differ­ with a lot of scantling and strength of wide-scope book with a lot of photo ent class boats. They stick strictly to materials data included. The short chap­ work and an equally impressive text. It tuning of an existing boat, discussing ter on tank testing is a good introduc­ is not particularly cheap, though few sheeting, sail shape and their effects on tion to that practice. books are these days. It has complete boat speed and balance. I believe this is HENRY & MILLER address them­ segments concerned with fleet racing as the first book I would go back into a selves specifically to sailing yacht de­ well as care and feeding o f sail plans. burning house to rescue, as it has pro­ sign and present a series of plots o f ac­ The investment is well worth it. His vided me with much food for thought. ceptable ranges o f parameters such as treatment of the aerodynamic theory WALKER, “ Wind and Strategy” , LWL vs. Beam, and so on. connected with sails is written in a prac­ while not working down to the scale and RACING AND TACTICS tical tone pointed toward results on the altitude that we are concerned with, CURRY, though the edition I have race course rather than elegant demon­ nevertheless gives a basic understanding was printed in 1948, still provides some stration in the class room. As with all of o f what is happening during the course very healthy observations on vessel per­ my books, I like to be able to under­ o f a day. I quiz the locals about the formance as a function of sail shape and line pertinent points that I have learned wind whenever I sail on “ away water” , trim. The author was one o f the first to the hard way at the lake. For this reason and it is amazing that one is able to fit record scientific tests made on sails in a I recommend that you buy the publica­ that kind of information into the more wind tunnel under controlled condi­ tions if at all possible. general picture that Dr. Walker presents. tions. His work makes a strong plea for TWINAME (1974) covers basically A t the level of competition we have to­ maintaining the cambered shape o f the the same territory as ELVSTROM, but day, knowing which side of the course sails all the way to the foot, with which in a slightly abbreviated form. On page 3 is most likely to feel new wind first I wholeheartedly agree. he presents a flow diagram titled “ First- early in the morning, or where it is ELVSTROM should be one of the Place Thinking” . The caption starts out, likely to lose it in the afternoon, is very first 3 or 4 books you add to your col­ “ A race won is a series of decisions cor­ important. His comments on wind sha­ lection. This volume is really a compen­ rectly made.” Much room here for di­ dow by obstructions, and wind refrac­ dium, and touches on all areas o f in­ rect application to your own particular tion (bending) by banks and shores, is terest, from the boat itself, to sails, to style of racing. He puts the responsi­ most pertinent to our needs. trim and helming, and right on through bility for winning performance directly, DESIGN tactics and racing rules. The author’s and wholly on the shoulder o f the skip­ Here we seem mostly concerned with record as a racing skipper stands by it­ per, not on the boat. This is something hull design, and probably more with self, and his idea as a designer have re­ many model yacht skippers still have to 50/800's than any other class. I have cently culminated in a 6-meter which accept. The number of folks who go out found CHAPPELLE to be the most features a bulbous bow similar to that and immediately bid on the winning informative, as in Chapter 3, LINES, found on new supertankers. boat at a regatta, are examples. The boat he takes the reader through all the SCHULT, on the other hand, concen­ didn’t win the regatta, its skipper did!!! necessary detail required to produce trates only on tactics, and is especially Twiname (1971) concerns itself directly a complete description of a hull on a concerned with the one-on-one types of Continued on next page. MARCH 1976 27 (Mrs.) CHAR ROHRING 4494 Tanglewood Trail Saint Joseph, Mich. 49085

• In the events of life there are the sad, the funny, the ridiculous, and what hap­ pened this morning at our breakfast table. It ’s so svild, you’ll think I made it up last New Year’s Eve. Most people 'WELL,ITOLDYOU HOT TO HAVE THE WEDDING ON A .SUNDAY/' sit at the breakfast table and talk about the kids, or the bills, or the happenings of the day to come. Some people don’t like glaze in eyes.): "We could have a guessing team member, is in each group, talk at all at breakfast, and what a contest. All we need are two gliders with too. Teams should include girl friends, shame! This is when the mind is fertile thermal sensors and a bunch of the wives, mothers, fathers, friends, and re­ and fresh. This is when unbelievable guys." latives. Only the judge and the pilot genius buds. CHAR (Aside to audience): "Good know the tune that will soon float Bear in mind that i t ’s the season of grief! He’s serious!” melodically from the sensor. The per­ windy days, and here in Michigan the Now you have the picture. In the son flying is not allowed to talk, but weather is starting to break. This means spring I thought a young man’s fancy keeps trying to repeat the familiar notes slope soaring at the dunes when the was supposed to turn to thoughts of with the humming o f the thermal sen­ wind is out o f the west. I don't want love! sor. The team members listen carefully, you to think that our glider pilots Knowing Bill, he’ll try to organize and call out titles o f songs as they haven’t been out there all winter. It’s this Sensor Serenade. I’ll cover the think they hear them. When someone just that now their endurance doesn’t event, when it happens, with my camera does call out the right song title, the have to be so peak, and there are more and tape recorder. You girls could pro­ judge in that group momentarily stops daylight hours. mote this kind of club contest in your the contest by a prearranged signal. At But back to the breakfast table con­ area. After you think about it for this time points are awarded to the suc­ versation. The playlet goes like this: awhile, it starts to sound good. Just re­ cessful team. Two new flyers come for­ BILL (Speaking seriously): “ I think member, you heard it first in MODEL ward to draw another song title from I can play Yankee Doodle on my ther­ BUILDER. the stock pile. These new pilots take mal sensor.” Here is the seed of the idea as I over the controls of the plane, and it ’s CHAR (Slowly and cautiously): " I f understand it from Bill. Start with two their turn to strike up the sensor! that calls for an answer, I’ll have to even teams. Each team must have one Keep the tunes simple. Use well write to Ann Landers first.” sailplane of comparable flying maneu­ known songs like “Twinkle, Twinkle, BILL (Lost in thought and unimpres­ verability. Two pilots, one from each Little Star," “ London Bridge is Falling sed by Char’s comment): “ I really team, are sent over to the person in Down,” "America,” or, "Mary Had a think, with all the wind action along charge o f song titles. These two pilots Little Lamb." Avoid songs with low the dunes now, I could produce a tune agree on one piece of folded paper, register, especially “ Asleep in the that you could recognize.” which bears the tune each will try to Deep!” CHAR (Glancing quickly to see if reproduce with the sensor. Understand, Girls, can you believe a day starting the children are in earshot): “ Oh?” both pilots are doing the same tune. like this? I have the funny feeling you BILL (Deep in thought. Right elbow After both planes are launched, each are all saying, "Y es!" Share that story on table. Making back-and-forth gestures team clusters around its pilot. An im­ with us. · with empty fork in right hand. Trance- partial judge, who is not an active tune­

Cortinued from previous page. seen skippers show up at lake side and with a skimming treatment, sort of with team racing, and I would recom­ embarrassingly drive home to pick up a once-over-lightly. It is interesting, as mend that club fleet captions take a forgotten mast. A simple check list many of the drawings are made as if good look at this as a style o f com­ would have avoided that! seen from the water level, rather than petition which will liven up club activi­ BROWN, though previously men­ from the Goodyear blimp. As many of ties. tioned in this column, deserves mention­ our problem situations occur at the far OAKLEY takes half of his book to ing again. It is a programmed type of mark, such a picture is a good help. He go over every solitary fitting on the test that asks you for a decision in a tac­ also provides a prototype log-book form typical racing boat. On our R/C ver­ tical situation shown graphically. Then which we should all be keeping in order sions, some of his advice is not appli­ it provides you with an explanation of to improve our set-up and trim on our cable, but the value here comes from the proper response, and illuminates the boats. reading the words o f a master skipper appropriate controlling race rule. It is OLD MASTERS who continually stresses simplicity and done utilizing the rules that you are These three books are each full of all strength in all fittings and gear. His ap­ most prone to encounter on the race sorts of hints and tips. On top of it all, proach to a big regatta, from prepara­ course, so that you rapidly get checked they were each written by a skipper of tion at home to the first gun of the first out on the do’s and don’ts that will long experience, whose anecdotal style race, is quite valuable. We could certain­ help you avoid getting foul points. of illustrating a point makes for enjoy- ly take heed o f his suggestions, as I ’ve HALL is a loose-leaf presentation Continued on page 81 28 MODEL BUILDER The prototype XA-8 had exceptionally clean lines. Top speed was 196 mph. MODEL BUILDER published 1-1/2" scale plans for the Shrike in the July 1974 issue. Designed by Charlie Smith, it could be flown R/C or C/L.

CURTISS A-8 “SHRIKE PART ONE WESTBURG

• By 1930, the Curtiss A-3 Falcon had become obsolete. The fabric covered, tube-and-wood frame concept o f struc­ ture was giving way to a new concept o f all-metal monocoque structure design . . . and the biplane was giving way to the monoplane. The biplane fighter was still big in the thinking of military men all over the world, but on the horizon were the Boeing B-9 monoplane bomber, to be followed by the matchless Martin B-10. Attack airplanes were very much in the thinking of A ir Corps planners, who decided to develope an entirely new type o f attack aircraft to replace the A-3’s and A-3B’s. It was to be a heavily The XA-8 during its extensive flight test program while at Wright Field, Dayton, Ohio, scene of this year's AMA Nationals.

The Y1 A-8. Two Browning .30 caliber guns were located in each massive wheel fairing, with 600 rounds for each.

MARCH 1976 29 i i » i!·.» « jftOllí iishil

Ϊ Ι Ι Ι | Ι I I I l ΙΖΪΛ& |2S5S"S ! II s?ss; lili * = a s iilillll

30 Prints of this airplane are available from Peter Westburg at $7.50 per set. See ad on page 74. MODEL BUILDER One of nine A-8's, while with the 37th Attack Squadron, Langley Field, Virginia. Note position of full-swiveling tail wheel. Control override system allowed steering when wheel was in the trailing position. See the knickers on the kids? Cars give away age of younger looking aircraft. armed, all-metal monoplane, able to at­ Curtiss chose the C-80 racing airfoil The XA-8 survived the test program tack any ground target. for the wing of the A-8, put slats on the after a number o f changes in the slats Two companies, Fokker and Curtiss, leading edge to keep it from stalling too and flaps, the oil cooler installation, and responded to the invitation to bid. Fok­ soon, and flaps on the trailing edge to the rear cockpit canopy and layout. Of ker’s XA-7 was a monoplane with a slow it down for landing. It was the first the 13 ordered, the first became a YA- thick low wing, a sharp spinner and Air Corps airplane to be equipped with 10, with 625 hp P & W Hornet, and the sharply tapered engine section lines, such a wing, and the test pilots at Wright prototype of the well known A-12 and a large scoop under the belly . . . its Field had a busy time learning to jockey Shrike. The last o f the series was engined performance was no better than its the throttle and stick, crank, the flaps with a geared Conqueror and designated looks. Curtiss won the contract for 13 down, and crank the nose of the hori­ the YA-8A, but the famous Conqueror service test aircraft with its XA-8, a new zontal stabilizer down to offset the engine had reached the end o f the line airplane with several untried ideas that pitching moment o f the flaps during and the YA-8A died with it. · are common on airplanes today. landing. (To be continued in April)

The A-8 was a tough, capable looking airplane. Oil tank was located on right side to obtain additional cooling. Fully cantilevered wings were still to be in the future. The A-8 was first Air Corps aircraft to have flaps and leading edge slats.

MARCH 1976 31 Sr. Slow Combat winners at 75 Nats II to r): Victor Radisi (2nd), Marty Phillips (4th) kneeling, Paul Klahn, who w ill be W.A.M. Combat Dir­ Bill Maywald (1st), David Aoyama (5th) kneeling, and F. Quezada (3rd). Tom Southern photo. ector for 1976. He's holding a Matador, desi­ gned by the photographer. Rich "von" Lopez.

<—T>

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

• I think this column is going to be full Control Assoc. An innocent enough the Cox wing panels (included in the of “ odds ‘n ends” , as I don’t have any­ name, I suppose, until you notice that kit), so you know it is going to be easy thing major for you. Bear with me and the name o f the club shortens to the to build. And the Skyfire is a good fly­ maybe you can pick up on something SUCA’s! That brings to mind all sorts of ing airplane, capable of inverted flight interesting. cute little jokes, but we have to keep and all the other usual stuff that most Recently I received a newsletter from MB’s G rating, right Bill? (Right. . . if .049 planes can’t do. Orin Humphries in Spokane, Wash. it's not too late! wen) As long as we're talking about the Seems that Orin is heading up a new Cox has been giving away foam little planes, guess I ’ll ask about .049 C/L club in that area, the Spokane U- wings with their .049 engines. These Combat. Anybody out there doing are the same wings that are used on the much of it? Not .049 Combat with jun­ Cox Super Stunter and Super Chip­ kers and used-up reed-valve .049’s, but munk, except for the fact that they with honkin’ T D ’s and get-serious air­ are not glued at the trailing edge. Has planes. We here in the N.W. keep de­ anybody come up with an interesting veloping our .049 Combat planes and use for these foam wings? are now to the point where we have Larry Renger, Project Engineer for planes that are really impressive. My Cox, sent me several sets of these wings, latest design is big at about 175 square and the kids and I built a couple of inches, and will make most anybody .049-powered trainers out of them. My say “ Far bleeping o u t!” On 35 foot kids aren't old enough to work with all lines it is almost too much to handle the little parts that go into a built-up and takes a bit o f getting used to before wing, but can handle fuselage parts one can effectively fly the plane in a without too much problem. By using match. the Cox foam wings, they were able to I just sent one o f the newest designs do most of the work on the planes down to Charlie Johnson in SoCal themselves, yet build a plane that can (read San Diego) for him to try, and it easily out-fly the usual slab-winged thin- will be interesting to see how he likes it gies generally used as trainers. as he presently can’t hardly stand .049 I have been going to come up with a Combat planes! Incidentally, I didn’t design for .049 Combat that uses the just send Charlie a set of plans . . . I Cox foam wings, but have yet to get sent him a whole plane, built and ready started on it. I am thinking of a profile- to fly. Even put a pretty decent TD on type plane, and would want the wing the plane for Charlie, along with lines panels to be easily replaced at the field. and a handle. Who says I ’m not a nice You know, an indestructo fuse and guy?! throw-away wing panels. The next item is kinda tough to write Well, this takes care of "See no evil." Name For those who prefer kits, take a about. I’m interested in pushing .049 him and win a wire-haired cookie-pusher! look at the Skyfire from M&P. It uses Combat, don't want to discourage any

32 MODEL BUILDER tion made o f this fact and it is going to be very easy for many to glue the LE to the mounts with the LE centered. A l­ most did it myself! The diamond airfoil used on the Snip is great for building the plane with all ribs on the build­ ing board, yet the plans show a scheme that involves shimming up the bottom spar, gluing ribs to the LE and bottom spar with everything just hanging in the air, the aft end o f the ribs elevated above the plans. After gluing the ribs to the LE and the bottom spar, the assem­ bly is rocked back onto the board and then the aft end o f the ribs glued to the bottom TE piece. It’s all more work than is necessary, and a good way to build in some unwanted warps. After the wing is framed, the plans suggest sanding it and then gluing on the booms and fairings. Always cover a Phil Granderson, launching for Col. Howard Combat plane and then glue the booms Rush at "75 Nats. Good form . Note furled str­ on. Makes it much easier to cover if you eamer, out of way. and about to open. Photo don’t have to work around the booms. by Tom Southern. "Visiting firem an" from England, Richard Also, due to the center section sheeting Wilkins, with his 460 sq. in. "Fast Blasta" FAI manufacturer who is willing to come not extending past the booms, the combat ship. Placed 5th in FAI, at “75 Nats. out with new C/L kits, and also want to covering cannot be removed in this area the loop and do figure-eights. The spec­ be honest with readers o f this column. to allow gluing the booms directly to tators loved that, natch, but we almost As I have yet to try to deceive you by wood. Ever try to glue something to had a mid-air and I had to get back out pussy-footing around and being cute Monokote? Didn’t work very well, did of the loop in a hurry! with words that mean little, let’s get in­ it? The L i’l Snip is a good first plane for to a little kit review that is honest and IMPORTANT NOTICE somebody interested in getting into straightforward. In last month's control line column, Dan some .049 Combat, or for somebody Midwest’s kit of the L i’l Snip has Rutherford made a gross reporting error, who wants an easy-to-build and rugged been out for awhile now and I got one which we wish to correct at this time. sport plane. Price is a little high at to try. Thanks to Midwest for sending The Clary Corporation, 2931 S. Main St., $6.95, but you don’t have to buy hard­ the kit, let’s see what it’s like. First im­ Santa Ana, California 92707, manufacturer of the former Veco line of model accessories, ware to finish the kit. My personal over­ pressions: Packaging is very well done, has NOT filed bankruptcy. all view of this kit: Coulda been better, nice kit box. Plans look good, are full- Of course. Jim Clary wouldn't mind if but thanks for trying. size, and fairly clear regarding construc­ you follow Dan's suggestion and "truck on One o f the recent issues o f the tion details. Lots of hardware included down to the hobby shop and load up" on Clary bellcranks, C/L horns, fuel tanks, fuel PAMPA newsletter had an article in it in the kit. In fact, all necessary hard­ line, spinners, wheels, etc. However, there’s that dealt with flying at night with little ware is included, right down to a blad­ no need to become a hoarder, as the line lights on a Stunter. The whole deal had der tank. w ill continue to be available. Continued on page 90 Sounds good, so far, but there is Jim Clary has been a regular competitor in control line speed (FAI, Class A, Jet, and more. The plans aren't clear on several Half-A Proto), and along with partner John points. The inboard panel is longer N ew ton , has held m any records. (like a Voo-Doo) but there is no men- As long as material for a bladder is included in the kit, I think it would have been a good idea to give instruc­ tions on how to fill it and how to start an engine on a bladder. Bladders are simple and really work well, but can give a person fits if he has never pre­ viously worked with one. The L i’l Snip does fly OK and shouldn’t give even inexperienced fliers much problem. Mine is powered by a TD, but I have seen several with Black Widows installed that also flew OK. If you are an experienced Combat flier, don’t expect too much when fly ­ ing a Snip, however. It doesn’t have any nasty tendencies, but it isn’t exactly ex­ citing. When I was test-flying mine, I happened to have several of my latest planes along and we put one in the air at the same time as the Snip was flying, just to see how much difference there was in turning abilities. With the Snip in Gary Stevens, always a ready, willing, and able "C'mon, Duke, we knew who you were all the helper when not flying or pitting. A valuable as tight a loop as possible without stall­ tim e!" Fox is a loyal friend of control line asset to MACA. There should be more like him. ing, I was able to put my plane inside modeling, haunts combat circles at the Nats.

MARCH 1976 33

35 Continuedon page 77 Material selection was interesting . . . thick wing. It can flex while flying, is foil from 1/4 inch or thicker wood, we Perhaps Perhaps a reed valve engine like theCox Black Widow or Golden would Bee give is a for case learning on a larger, .19 to “ Hot Stuffed" Performanceback together in right reasonable a wind away. not is with an all wood wing we know we went to an absolute flat plate, 1/8 inch surfaces are also 1/8 inch; more rugged high for really smooth flying, but fun. tried that version. harder to Speed learn does the makemaneuvers, and there it .35 size, built-up ship. But plane; a the mistake .049,usually bounce all back for more, balsa or can be model will with vertical and overhead eights. couldn’t get stead much o f o trying f an to airfoil, sand and carve an air­ so in­ amply strong, and yes, it works. Tail a a mounting on the plans but have not with the larger craft gives you a broken a problem with thission small is good. ship; line The ten­ Flip has no difficulty a a more restrained performance; we show The model ended up with a 27 inch Aside from the model, those dacron I/2A designs just don’t have the wing inch length. And for at us least, the per­ mits hard landings; bore the type, straight-in full usually with little or no span, span, 130 square inch wing and area, 20 formance is pure fun. Speed high, is too much drag and stretch. Going make a to tremendous 35 performance d iff­ We fly almostwhere a landing exclusively gear as take­ is useless, over grass, small wheels. Grass field flying also per­ damage. So we left the landing gear o ff lieved lieved the big problem size .. was . most formance. flying lines have got to go! Just too erence. One other design was consideration the landing gear . . . or lack o fone. offs and landings can’t be made with and gained more performance. area area necessary for good aerobatic per­ foot, .008 or .012 stranded cable lines Note screen on Cox .049 Tee Dee intake to keep out dirt. Perfect 2/3 ounce tank was later won't do for stunt capabilities. We be­ replaced by 3/4 ounce unit. Easily strapped on with rubber bands. of the showed all us balsa that kits they on will the fly market, but sure The May 1975 MODEL BUILDER By DICK SARPOLUS ... A fine "Okay, Dad, I'll launch it one more time . . . then let ME fly it, for Control linkage, engine mount, and tank installation are all "outside" Flip was designed to if see it was poss­ Medallion .049’s, had ample power for ible to work within the limitations of Pete's sake!""Rapid Rick" Sarpolus, ready to flip Flip for the author. and easily accessible. the big ones; flaps, thick airfoil, the built- way to mance in go small a wantedWe package. for to competitive perfor­ .049 engines made it obvious that Cox • This very simple form 1/2A all the model pattern maneuvers is . . a . not MARCH 1976 issue issue had a "real”the Gremlin. I/2A That pattern was ship, built up wing, just like full fuselage, etc., and it is model that could be built quickly . . . typical plastic ready-to-flies, and many practical, capable stunter. It quite will like a per­"real” stunt model, but well using all sheet tion balsa, simple techniques, and construc­ still get a ship that Helps Helps to get the feel of cutting, say, say, one hour or so. Experience engines, with in particular the Tee Dee or enough for some a advantages as fun stunt trainer. flying, Our and it offers would perform well the enough for pattern a skilledor maneuvers flier for to enjoy, euvers. a beginner to learn the man­ project for any young modeler. sanding, and finishing wood. balsa All parts easily cut from sheet get most of that performance with a good performance. Experience with the • · · · · stock . . no fancy shaping required. And oh yes, it flies great, too! Exactly one year ago, we published an article by Bob Gerbin, in which he explained how he went about building a 1*3/4 size Windfree. This discussion by Lister fits perfectly into such a project. This is Lee Buffum, launching Bob's ship on a hi-start . . . all 7 pounds of it!

R/C SOARING le

Our former R/C SOAR ING editor comes out of partial retirement to resent an interesting article by the author of the "Sailplane Designer s landbook", Eric Lister.

Bob Gerbin used tw o scales for direct enlarge­ ment of the Windfree. Lister provides the formula for checking those new wing spars. that should be considered in the design configurations and provides a method for of sailplane wings; airfoil section, loading, “ adjusting" a good design to any given • . . . 7he time has come, the Walrus aspect ratio, flying speed, span efficiency, wing size. Should take some o f the said, to speak o f many things; o f ships covering materials and even leading edge excitement out of test flying . . . and and sails and sealing wax, o f cabbages turbulators. One significant point, how­ that can’t be all bad. and kings. . . and wing spars? ever, has not been reviewed; spar design. And so, Mr. Lister, you’ve got the With sailplanes, more than with any The merits of the numerous spar floor other type o f flying machine, the wing’s systems available to R/C sailplane de­ “ A fellowsailplaner in Japan recently the thing. Devotees of power modelling signers could be presented ad infinitum, built a very high performance ship of can argue the merits o f various sizes as well as ad nauscum. Weight, materials, 164 inch span that had broken a wing and makes of engines, discuss the pros complexity, rigidity are all potent sub- on the hi-start. His question was classic: and cons o f propeller diameter, pitch topics. But in the final analysis, the real what could he do to the structural and shape, and even fuss a bunch at one world results of spar design kinda lets it design o f the wing to avoid in-flight another regarding fuel additives and all hang out, so to speak. Either the disasters? We’ve all faced the same mixtures. But when one pushes for designer’s theory and structure are problem ourselves at one time or another, mental rehabilitation, the wing . . . sound, or he makes arj unscheduled and what is needed is some form of an length, width, planform and cross sec­ public confession of his erroneous cal­ analytical cut at how beefy to build a tional contours . . . is about the only culations by a dramatic structural failure. wing structure to keep it alive and well. subject open for debate. Now there are This usually occurs under stress of tow- The only other approach is to design those who would chew and snarl over launch, in view of a cast o f thousands, structure on a pure gut level. I under­ such small bones of contention as and the once proclaimed super-ship stand that approach because I ’ve always all-flying versus conventional horizontal returns to earth on a flight path similar done it that way myself. Maybe some tail surfaces . . . or even the vertical to that o f a cardiac duck. folks run honest calculations, but that placement thereof. Then there’s always Determining how big, how strong, can be real work. the fiberglass-vs-built-up fuselage con­ how thick, how heavy should the spar "It seems obvious that a base point troversy; but who cares? Or internal as be for a given wing planform, vehicle for a new structural design could be opposed to external ballast. So what? loading, and flying speed can get quite some existing wing that has been proven Or the legalizing of thermal sniffers. involved. The problem can also be structurally okay by numerous flights Ho hum. The point is that for the sail­ shrouded with considerable EBS ("E . . . even if of different span, spar plane person, there’s not much to cause for esoteric), if the author is so inclined. thickness, wing loading, etc. All this a real, "Y o u ’re a bigger one and so’s However, a practical and workable math­ past design had to do was not break on your ole man” screaming logic-style ematical . . . that is, it ain’t hard . . . tow. If you’ve got one like that, or will quarrel. approach to spar design has been devel­ accept a proven design such as featured A t various times, MODEL BUILDER oped by Eric Lister. Lister’s concept is in MODEL BUILDER, we can use that as has presented data on most variables based on known, acceptable wing spar the point o f departure. This approach MODEL BUILDER THE OLD SYSTEM THAT WORKED (1) THE NEW SYSTEM (THAT SHOULD WORK) (2)

3 /1 6 " X 3/4" Spruce 1/16" x 1 /4 " Cap s t r ip s 3 /8 " X 3 /8 ' 1 /8 " X 1 /2 " Balsa ,1 /1 6 " x 1/4" Cap strips 3/8" X 3/8" Spruce 1 /8 " X 1/4" Spruce 1 /8 " X 1 /4 " Balsa Ό ~ v------~ V 1 /1 6 " X 3 " Sheet 1 /1 6 " X 3 " Sheet 1 /1 6 " X 3 " Sheet 1 /1 6 " X 4 " Sheet top and bottom top and bottom top and bottom top and bottom 9 .5 " 10.8" J

alleviates the complications of starting systems have equal safety margins in or tow line, the lift force on the wing completely from scratch. Such design bending at the root if they have the moves to a forward location . . . about decks for computers do exist, but unless same ratio of bending stress to rupture at the 25% to 30% chord region, parti­ your name is Grumman, McAir, LTV, stress. Two types o f loading were cularly at the root. To help prevent etc., I don’t think you’d be too considered and the results came out wing flutter, the structural weight of interested. Rather, what is recommended satisfactorily in both cases. The first, the wing should be as close to the is a procedure for new spar design, based type of loading considered was for the leading edge as possible. If the wing on an existing spar system, which will uniform case, and the second was for structure balances close to 1/4 chord, provide margins of safety similar to an elliptical loading, such as an elliptical that’s good. More forward . . . more those o f the known spar, despite differ­ wing would give. Both examples worked, better! The other anti-flutter gimmick ence in span, wing loading, thickness, is to use sheeting to increase the tor­ and material. It’s sort of a bootstraps sional rigidity o f the wing. Diagonal design process. Here’s how it works. Flange braces between ribs and between the Let’s say you've got an old spar front spar and back spar or trailing W e b - TT system that never failed in the type of d t edge is also helpful against flutter. “ O.K. . . . here’s the example. I took flying you have in mind for the new " I " Beam design. Let’s call that system number I , a spar system that had been used noted by the subscript 1. The new wing, i ~ m LI successfully on a 6 foot span, 9.6 oz. to be built with the same degree of wing loading, average chord 8.6 inches, structural safety, will be system number balsa spar wing, and redesigned that spar 2, and noted by the subscript 2. Other system to handle a 164 inch span, 12 definitions used in the design calcula­ H H U t l sr* ounce wing loading, average chord of tions are: 8-1/4 inches, and spruce spar ship. The # 6 footer had a 10% thick airfoil while Sr = rupture stress (breaking stress, LOADING TRIED strength o f the spar material: Use the big new design uses an 8% thick 9400 for spruce, 3500 for balsa) section. The aspect ratios are quite a bit b = wing span, inches 11Η 11) i n y * 1 different, but both planforms used a w/s = wing loading: total airplane constant chord for the first 2/3 span weight in ounces/wing area, in square i and .4 taper on the outer 1/3 span.” feet And there you have it. What you’ve t = distance from the top o f the top so the only wing shape feature that is always wanted to know about wing flange to the bottom of the bottom important is planform. That is, both design but were afraid to ask . . . flange in the spar, in inches wing I and wing 2 must be elliptical, because you knew there’d be an answer A = measured cross sectional area rectangular, 2/3 straight plus 1 /3 tapered, from someone who also had no real of the flange, in sq. inches or any other combination o f rectangular knowledge, but who wouldn’t admit d = distance from the center of the and taper, so long as they are similar. it. And that really causes problems, flange thickness on top to the center of “ If the values for a new spar design, since there’s always the nagging concern the thickness on the bottom flange, in and some older, successful design, are down deep inside, “ But what if he’s inches put into the above expression and the right?” c = average wing chord length: wing result comes out to be greater than 1.0, So go forth and do likewise . . . area, in square inches/span the new wing (that is wing no. 2) will Whatever that means. Wing Area - 645 In2 Wing Area = 1355 In2 So much for the nomenclature, here’s have a greater margin of safety (won't Sr t = 35 00 PS I Sr 2 = 94 0 0 PSI the expression you use: break) than the old one. If the value is 1.0 on the button, each wing is just as bi = 75 in. b 2 = 164 in. capable in its application as the other. w/s-| = 9.60 O z/Ft2 w /s 2 =11 Oz/Ft2 If the value comes out less than 1.0, the ti = .85 in. t 2 = 865 new wing will have a smaller margin of A i = .0625 in.2 A 2 = .141 in.2 safety against bending and breaking d-| = .7 2 in. d 2 = .677 in. than the original configuration. c-| = 8.6 in. C2 = 8.26 in. “ We’ll go through an example in a (6 45/7 5) (1 3 5 5 /1 6 4 ) “ Just to give a little visibility as to moment, but first, in the interest of Old wing New wing where that came from all of a sudden, strong wings, a few general points are Putting the values for system 1 and it’s based on cantilever T beam bending worth noting. For instance, at very 2 into the design equation, we get: stress analysis. It means that two spar high angles of attack, like on the hi-start Continued on page 80

MARCH 1976 37 The author's test model of the Tyro Playboy Sr. Finished in red, white, wnd blue, it is very appropriate for our Bicentennial Year!

PRODUCTS IN USE By JOHN POND Tyro Model and Supply PLAYBOY SENIOR Old Timer.

• Every so often, a modeler w ill pro­ construction o f the fuselage, the writer provided with small hardwood strips duce a kit that is in everyone’s opinion, made several small additions he feels which are tapped after line-drilling both a modeler's kit. Such is the Playboy kit are quite necessary to convert this ex­ hardwood pieces (in the fuselage and put out by Barnet Kernoff of Tyro cellent flying free flight to a potent R/C tail). The writer used 10-24 nylon screws Model and Supply, P.O. Box 11511, Palo assist Old Timer competitor. to attach the tail. Alto, Ca. 94306. This kit shows much The pylon construction, which is The fuselage was also provided with preparation and thought, as the plans made of three balsa laminations, was a hatch on the underside. This requires are straight forward and the parts fit changed to include a 3/32 plywood core the purchase o f a piece of 3/8 sheet beautifully. Price of the kit is $39.95. with the two balsa outside pieces. A about 6 x 3 inches. This provides the ac­ When the buyer first opens the kit, slight bit o f added weight, but one that cess to your set, which should be he is immediately struck by the neat ar­ is quite necessary for being able to mounted with the servos facing down. rangement o f all parts that are carefully stunt the model indiscriminately. Two 4 4 0 bolts are all that are neces­ rubber banded together. Although it has While on the pylon construction, also sary to keep this hatch in place. been said many times before, a little recommended is the addition of 1 /4 inch In planking the forward part of the time spent studying the plans and famil- triangle reinforcement strips which are fuselage, the writer was pleasantly sur­ arizing one’s self with the assorted added to the underside of the pylon plat­ prised to find a novel change in the wood strips and parts, there should be form. These simple triangular strips will method o f applying the sheeting. In­ no shortage of strip sizes. add tremendously to the strength of stead of 1/16 or 3/32 vertical sheeting In constructing the model, the writer the platform that supports the wing. as originally designed, large tapered decided to use the new cyanoacrylate The tail was fitted to the fuselage sheets, somewhat resembling King-size glue. With the fine balsa in the kit, it with screws. The fuselage is provided trailing edges, are supplied. These aid was indeed a pleasure to quickly “ Hot with a plywood (or hardwood) strip immensely in speeding up this tedious Stuff” the structure together. During about 1 by 2 inches wide. The tail is portion of the fuselage.

Hatch built into bottom of fuselage provides access to Kraft radio Completed model, waiting for its Kote of Super Mono. Power is a installation. Not bad work for an amateur builder! Torp .35. Williams Bros. WW-I wheels help preserve old timer look.

38 MODEL BUILDER Stabilizer modified for radio operation. Elevator spar doublers for Wing has been placed on edge to install vertical webbing. Ply dihedral hinge installation. Tail fastened to fuselage with nylon bolts. braces still to come. Note bottle of white glue and brush applicator. The writer recommends that the throttle the front-rotor type K & B from the leading edge. Glide was found sheeting not be completed until all ra­ motor. to be superlative. With all servos, bat­ dio gear is installed, including the push- White Super Monokote, trimmed teries, and receiver mounted forward of rods (Nyrods were used in the hook-up with metallic blue and Bridi Striping, the balance point, no lead weights were of this model). In addition, this gives was used to cover the model. As can be required. you a good chance to make sure the en­ seen, the motif is rather patriotic (Spirit A 1973 Kraft Sport Series with KPS- gine mount (Tatone used here) is check­ o f 76!) in its red, white, and blue con­ 11 servos (three; rudder, elevator, ed for easy removal by using suitable figuration. For those interested in motor) was employed, with Pylon brand blind nuts. Incidentally, a cowl was weights, the completed items were: Golden Rod control links. Several “ def- made for this model although no wood wing, 12 ounces; tail assembly, 3 oun­ eckilities” were noted, among the most is provided. The builder used 3/8 sheet ces; and fuselage, complete with radio, prominent being the shutoff o f the pieces, cut to the approximate shape of motor, and wheels, was 2-1/2 pounds, motor within the allotted 20 seconds. the dotted outline shown. In this case, giving a total of 3-1 /2 lb. flying weight. The writer recommends a mechanical the cowl had to be expected to match Test flights held at the Pond Com­ timer, such as a Tatone Fuel Shutoff the motor being used. The “ Cheek memorative Meet in Santa Maria were type, be employed. With this arrange­ Cowls” were closed in on the bottom remarkably simple. The initial flight ment an even lower-cost, two channel and rounded to present a clean profile. found the model with a natural left radio set can be used. If a pressurized This simple front cowl improves perfor­ turn under power. A slight bit of right fuel system is employed, then the sim­ mance immeasurably. trim gave a beautiful spiral upward. All ple shutoff system so successfully used Accessories employed to complete stops were pulled out on the second by Cdr. Jack Bolton in his Playboy is this model were William Bros. WW-1 flight and wouldn’t you know it, the un­ recommended. This consists simply o f a type 3-1/2 inch wheels, Tatone long official flight was the only “ Max" flight control wire of about 1/16 dia with a mount, and a square one ounce modi­ registered by this flyer all day! right angle so that when the motor ser­ fied Perfect tank. For an engine, the The following “ adjustments" were vo is pulled to full idle, the cross piece writer selected a series 64 Torpedo .35 employed in this model: No downthrust, pinches o ff the fuel line. Simple, yet ef­ which was originally in an early Good­ although several degrees would be pre­ fective. year Racer. For purposes o f simplicity, ferable to putting in elevator down- In conclusion, if you want to be a no fuel pressure system was employed, trim. The model was balanced at the real “ hot dog", the writer recommends and a Perry carburetor was used to 45% point o f the wing chord, measured Continued on page 79

Mrs. "Daddy Warbucks", Maryann, holding hubby's handiwork.

MARCH 1976 39 PHEPBAJ.· 1/8* WASH-IN.1/8* RIGHT f*N £ L ONLY 1/8 RIB _ RIB 1/8 1 1/16 WEB 1/16 ribs li/a 7 1 ] a BOTTOM 1/4 BRACE 1/4 top 1/32 SHT a WEBS RIBS 1/8

O FULL SIZE PLANS AVAILABLE - SEE PAGE 94 MODEL BUILDER The author/designer, the "O RCA," and the inevitable model airplane The ORCA's lines are clean and simple. Fancy looks don't get the trap . . . a lone, tall tree! Larry reminds you a little of Dick Korda. job done, but functional beauty does. ORCA’ FA.I. Power By LARRY SICURANZA . . . This is not just a construction article. The author takes us on a complete tour of the FAI Power picture, and invites you into it. The tour is very well guided .. and the model's good too!

• Swift and graceful, Orca moves with effortless power through its three-dimen­ sional realm. Whether rocketing up in pursuit or drifting under the sun, its black and white beauty dominates the eye with sheer majesty. The above describes the real animal, which I first saw at Marineworld. I was so impressed by this marvelous creature that no other name would do for my new FAI ship. It was already black and white for air and ground visibility and had a pylon shape similar to Orca’s dorsal fin. Unlike the real Orca, known to those who know nothing about him as the Killer Whale, the balsa bird has evolved Timer rigging for flood-off system. Timer releases pinched pressure line from tank, dumping fuel through only six Marks in three years. into carb . .. blurp! This article describes the current ver­ sion and ignores the others, as every­ thing learned from them is used in Mk 6. If you’ve read this far, it ’s because the photos attracted you, or you’re al­ ready a FAInatic, or you are thinking about maybe trying FAI Power. If the latter is the case, the only advice I can give you is do it\ Try FAI. I got into it three years ago after reading the Zingo article in FM. I only wish it had ap­ peared ten years ago! Up ‘til then I ’d thought that Power was too expensive, too difficult, too this or too that. Fish feathers! I t ’s nothing o f the kind. One thing it is, is demanding. None of the instant success or gratification so eager­ ly sought in our hollow society. You The single line V.l.T. fitting in climb position. First release puts stab in glide trim , second release is DT. Line with ring is to auto-rudder. Continued on page 82

MARCH 1976 41 Gorgeous framework of a 3/4 inch scale Travelair 2000, by Ned Kragness, of Virginia.

FREE FLIG HT SCALE By FERNANDO RAMOS

• Even though only about three weeks the overall atmosphere must be low part of that vacation. The flying site we have gone by, at this writing, since the key, to insure absolute fun. The idea can use, is perfect for F/F Scale, and it is February issue of MODEL BUILDER behind all o f this is kind of two-fold. close to Disneyland, K nott’s Berry Farm, has been at your doorstep, the response One is to be able to show o ff your Marineland, Universal Studios, etc., and to starting a National Scale Free Flight latest creation, and the other to have only 10 miles from the Pacific Ocean. organization has been very pleasing and the pleasure o f flying it as well . . . the There are campgrounds which are close, positive. One interesting note is that the Oshkosh of F/F Scale! Between flying, as well as a multitude of motels in every letters have not been exclusively from you can see where a multitude o f ideas price range imaginable! major cities of the U.S., but from small could be exchanged among the modelers. Maybe this is just a pipe-dream, but towns in sparsely populated areas. All This whole concept is in no way meant unless we make an effort to do some­ of the mail received to date is in favor to detract from the AMA National’s, but thing to bring F/F Scale modelers to­ o f starting this organization, and only to be something in addition to it. gether, we can’t further our cause. three letters stated that AM A member­ If this whole Scale Organization gets Some o f you may ask, “ What is our ship should be a requirement. (These o ff the ground, I will propose that the cause?” Well, simply stated, I think it three letters represent less than 1% of West Coast be host for the first Scale is to learn to build better flying scale the letters received.) If this trend con­ F/F Nats, in the summer o f 1977. (It models, and nothing helps more than tinues, then it is clear that the majority will take a good year of careful planning to bring together modelers with similar o f the response is in favor of dropping to make this very successful.) Many interests and exchange ideas. Enough the AMA requirement. One comment families plan vacations in California, for soap-boxing ... until next month. that is common to many letters is that several reasons, and nothing could be * * * the AMA is primarily an R/C Club, and better than to take in a Scale contest as There have been many requests to therefore there is doubt that it could help the F/F Scale modeling cause. A t any rate, I’ll wait until the next issue to give a final evaluation o f the mail received. While still on the issue o f the “ Organ­ ization” , I've been doing a little pipe- dreaming, so let me ramble on a bit. In addition to bringing together modelers with a common interest, I think that one main objective would be to have an annual Scale F/F Nationals . . . not just a big local contest, but one with National, and possibly International, significance. The way I see it, it would have to be at least a three or four day affair, with one day devoted to judging, and the others for flying. It could include indoor as well as all o f the out­ door events, plus perhaps a Thompson Trophy as an added bonus. The way the schedule would be set up, a con­ testant could fly in every event without Peanut Scale Pietenpol was second in class at Chicago Scalemaster's August annual. Buil and feeling hurried or frustrated. Above all, flown by Phil Cox, Highland, Indiana. Photo by Larry D 'Attilio.

42 MODEL BUILDER once again go over the Floquil method of finishing models that I have been using for many years. In addition to this method, I will outline another one that some may prefer to use . . . in particular, for rubber powered models. I guess it has been about two years or so since I wrote anything about Floquil, and the way I rave about it, one would think I had some kind of financial interest in the product! First, many of you who are new to modeling may not have heard o f this paint. One reason perhaps, is that it is primarily a model railroad product. However, it is nothing short of sensa­ Peanut Scale model of Johnny Livingston's No. 14 Monocoupe, built by Keith Ward, who is tional for flying scale models. It comes president of the Chicago Scalemasters club. in an abundance of colors, with neat Floquil. Lacquer thinner can be used in the model is rubber or gas powered. names such as Mud, Grime, Reefer a pinch. If spraying is desired, you must Obviously, the rubber model must be Orange, Caboose Red, etc. There are thin it down at least 50-50, and you kept considerably lighter in weight. also quite a variety o f stains which are MUST strain the paint. This is impera­ For a rubber powered model, I ’ll cover ideal for cabane and interplane struts tive, particularly if you are using an it with tissue the same color as the on WW I aircraft, or wherever a natural airbrush. I use a commercial paint basic color scheme. Naturally, that wood effect is required. If there isn’t strainer, but you can use nylon hose for restricts you to only a few colors, if a color you need, you can mix the this purpose as well. Spraying Floquil you are using japanese tissue. If the various colors available until you get really does a super job. If you want to color scheme is other than the standard the one you want. get shading for ailerons, ala Doug blue, yellow, orange, or black, I use I use Floquil in several different McHard, then airbrushing is recom­ white. ways. The first is to use it on bare mended. Incidently, Reefer Gray does Let me use my Sig Monocoupe, Oct. wood, such as for wing struts, cabane a better job than black for this applica­ and interplanes, landing gear, etc. The 1975 issue of MB, as an example o f how tion, in most cases. advantage is that it only takes one coat I use Floquil for a finish on a rubber for the paint to cover adequately. But Another use for Floquil is to color model. The Monocoupe has a real if you put one coat on and let it dry nitrate dope. (Please note that it will striking color scheme . . . one which thoroughly, then sand smooth, and apply not work for butyrate! This is great, in my opinion, is enhanced by using another coat, you’ll have a neat job with since I don’t like the way butyrate Floquil. The fuselage is all red with very little grain showing. This material handles anyway!) Many have asked only a bit of white trim and lettering brushes quite easily, without streaking. how much Floquil to mix with how (the white trim and lettering is provided For rubber powered models, this is the much clear dope. I wish I could give on a decal sheet in the kit). The way to go, because there is very little you exact measurements, but I use the wings and tail are predominately white weight build-up. If thinning is necessary, eyeball method for mixing the colors I with red trim. I covered the entire then use the thinner recommended by need. A lot depends also on whether Continued on page 62

Watch those trees! Aeronca C-3 by Phil Cox took first in AMA scale Ted Dock launches his Eastchurch Kitten, which placed third in at Scalemaster's Annual. This, and photo at right by Larry D’A ttilio. AMA Scale at Scalemasters' Annual last August. Electric powered. MARCH 1976 43 Aeromodeller magazine Flying Scale columnist . . . being a concoction of everything from soup to Peanuts! Eric Coates, and his contest-winning D.H. 9A.

Speaking of which, Bob Peck recently YOU’RE NOT GETTING OLDER, motors. He overlaps the ends about I/2 sent to the hangar a tiny terrarium con­ PILOTS ARE GETTING YOUNGER inch, adds glue, then clamps the joint taining a for-real peanut plant. He sez It seems that aero photographer War­ with a clothes pin, while it cures. We its guaranteed to increase our output! ren Shipp was conducting an interview are quick to caution extreme care in AND SPEAKING OF REAL PEANUTS in preparation for an article on water the use o f all such adhesives. Wall also Did you know they are not really bombers. Being a former crewman him­ suggests that wheels for small models nuts at all, but legumes? Neither did we, self, he was particularly interested in a can be retained to their axles with until we read the complete scoop, direct converted B-17, and asked its pilot if he short slices of radio wire insulation se­ from Texas “ nut farmer” Bill Caldwell, had learned to fly the type during lected for a snug fit, secured with a via Jack McCracken. Turns out the pea­ World War Two. “ No” , was the an­ drop o f super-glue. nut was not originally native to the swer, "They didn’t have any 3-year-old MIAMI NEWS U.S., having migrated from its home in pilots in WW II!” Warren said he never From Dr. John Martin comes copies South America, to Spain, and then to felt so old so suddenly in his life! of “THE HANGAR PILOT", from Africa, before ending up in this coun­ AND THEN THERE WAS THE which we have abstracted the following: try! And, according to the Department FELLOW . . . “ Granted that indoor isn’t for everyone, of Agriculture, Peanut Butter ranks who stared intently at the self-addressed we should still share this great good for­ among the most nutritious foods avail­ envelope, wondering how it did it! tune with those who have never tried able, edging out eggs, dairy products, (courtesy Frank Scott) this sport, and who may become and most cuts o f meat, in protein con­ NEW USE FOR “ SUPER GLUES” ‘hooked’ as the rest of us hangar pilots. tent. So there you have it folks . . . From Alan R. Wall, of Australia, Remember the thrill of YOUR first 3 Peanuts are not really fun to build and comes the idea of using cyanoacrylate minute Easy-B flight, or your first bly, but can sustain you as well! glue for joining the ends o f rubber R.O.G. Scale flight? These are endur­ ing pleasures and we should try to stim­ ulate interest among our friends, and also befriend those who show up at our contests, who are new to the game, to help them to success.” ALSO FROM MIAMI Among the regularly scheduled events are interspersed novelty com­ petitions, using strictly “ top of the head” rules. Intended just for fun and games, the winners o f these grand ef­ forts receive NO annual points, lots of abuse from their fellow pilots, and to­ tally worthless prizes. For these reasons (???) the events are usually hotly con­ tested! THE CROWDED SKY Unfortunately, active promotion can achieve TOO MUCH in the way o f re­ sults, as Dr. Martin comments: “ The second contest was a great artistic suc­ cess, but had forebodings of future pro­ blems . . . namely . . . Will success spoil indoor? We used to say, ‘ Indoor isn’t for everyone', but looking at the herds of folks standing around the hangar I now ask, ‘Is indoor getting too popu­ A display of solid scale models constructed entirely from wooden matchsticks! Models and lar?’ There were 42 entries in the meet photo by P.T. Capon, England. All are to 1/120 scale. . . . 36 flew . . . but at least that many 44 MODEL BUILDER more were milling about the floor, fly ­ ing gliders, Sleek-Streeks, Skeeters, and other assorted ballistic missiles, all of which were hazardous to contest planes, and sometimes life and limb. Do we now need a Sargeant-at-Arms? Several times I tried to pick out a piece o f floor to ROG a Peanut but no matter where I turned, I gazed into a forest of legs, knees, and buttocks. OK, since we DO have fly-ins once a month, I suggest that flying, AT CONTESTS, be restricted to contestants.” RALPH SCOTT’S HANDY HINTS ‘‘Moisten the inside of a Baggie plas­ tic food sack with rubber lube; drop the rubber motor in and rumple the bag thoroughly. Leave the motor inside for a while or overnight if time permits. Carry this lube bag to the field with you for additional use. It w ill add enough lube but reduce the problem of motors throwing o ff excess tissue-staining quan­ Just one of many of Ray Malmstrom's delightfully original sports models is this rubber-driven tities. ta c to r canard. See sto ry in te x t. ‘‘Take along a styrafoam cold box and freezepacks to the flying field. Heat is murder on rubber motors, cement and beverages. I carry a good supply of motors, soft drinks, cement and a ham sandwich. As late as the following morn­ ings, things will still be cool.” NEWS FROM FRANCE: Courtesy of Jacques Pouliquen, we present the results of the November 1975 Model Air Club de Marseille con­ test: Classement General (Peanuts): 1. |.L. Rouquier RWD 8 (see photo) 2. J. Pouliquen Waterman Racer 3. W. Mooney Renard 17 4. J. Frugoli Laird 5. Roger Aime Bucker Jungmeister Classement Maquettes (larger than Pea­ First place in the recent Marseille (France) Model Air Club Peanut Scale contest was taken by nut scale models): this Polish RWD 8, by J. L. Rouquier. Photo by Lucien Millet. Continued on page 79

Otakar Saffek with CO 2 model and engine Otakar Saffek's wife holding his all-balsa model of Otto Lilienthal's hang glider, made in Czechoslovakia.

MARCH 1976 45 Peanut ® SPAD X III ® By JOHN WALKER . . . A particular airplane can be so well known and popular that it gets completely overlooked! Such is the case of the famous Spad X III. The matter has now been attended to. • The Spad X III was preferred by such Stuff or Zap adhesives greatly speed up dowel holding the rubber will be mount­ famous Allied aces as George Guynemer, construction. Assemble the finished ed. One advantage of using Hot S tuff or Rene Fonck, Eddie Rickenbacker, Frank sides starting at the nose. Make sure Zap is that excess adhesive adds very Luke, Phineas Pinkham.and G-8 because your work is square. We use aluminum little extra weight, and is absorbed into it was a solidly built fighter that did not blocks that were machined square at the the wood to make it stronger. Lightly shed wing fabric in a long dive, as did local high school machine shop to keep sand the fuselage structure before cover­ the more lightly built Nieuports. Six­ the sides square during assembly. ing. Bond paper of 1/64 balsa may be teen pursuit squadrons o f the AEF Add the formers and stringers. Stren­ used around the cockpit area. were equipped with Spad 13’s. gthen the area in the tail where the Construct the landing gear legs and Designed in France by the Societe pour Aviation et set Derives (headed by Louis Blériot), the fighter was develop­ ed from the earlier Spad A.2 and Spad 7. The craft had a span of 26 ft.-l 1 in., a length o f 20 ft.-8 in., and was power­ ed by a 200 HP Hispano-Suiza engine. It is thought to have been the first French plane fitted with twin synchronized machine guns. Spad 13’s flown by Guy­ nemer and Fonck were fitted with single shop 37 mm cannon that fired through the hollow propeller shaft. Top speed was 130 MPH at 6,500 ft., with a maximum service ceiling at 22,300 ft. After the war, many of the 8,500 Spad I3 ’s that were produced, could be found in flying services around the world (including the U.S.) as first line fighters, well into the 1920's. BUILDING THE MODEL Mount the plans on a flat building board. Protect it with clear plastic sheet. We save the left over backing from Monokote for this purpose. Start by constructing identical fuse­ Nose moment of the Spad is short, but w ith a plastic, or carved bass prop, note too much lage sides from firm 1/16 sq. balsa. Hot ballast w ill be needed. A small blob of clay can be seen under the cowl in the top photo.

46 MODEL BUILDER

petition applications, think again, how­ ever. THREE-VIEW OF THE MONTH ... Stevo Helmick’s Schlitzer 2-43 I first saw this model at the August, 1975 FAI Trials sponsored by the Kent Strat-O-Bats. At that time, I suffered from a massive case o f disbelief, as the model sported an honest-to-gosh wheel! Well, Stevo, has since gone on to dis­ prove all o f us scoffers. The model flies, and flies well (how well does it taxi? wen) Even though it has a painted-on "cabin” (shades of Dave Linstrum) and a wheel, it is an excellent performer with several innovative features. Specifically, it has the stab mounted on top of the fin, with the d.t. line be­ ing carried to the stab via NFFS nylon tubing. Additionally, the fuselage boom exits the pod at the wing center line, which places the stab at a substantial distance above the wing. Steve says the following about his MYSTERY MODEL FOR MARCH ship: " I t was to be a blend o f the Seel- worked out perfectly, as had the circle build. igull windy-weather design and the calm- tow. In fact, the model handles beauti­ MYSTERY MODEL FOR MARCH air Swizzle-Stick (how about those fully on the line, showing a tolerance This month, MODEL BUILDER is names!). The fuselage pod is quite for being pulled either direction cross- turning the tables on F/F editor, Bob roomy for various circle towhooks, and wind . . . a rare quality. It must be Stalick! We’re supplying the Mystery that was responsible for the semi-scale stated that this is a matter o f having Model, and he won’t see it until he re­ look. It is really an ugly design made symmetrical wing warps more than any­ ceives his copy of the magazine, which tolerable by camouflage. The design has thing else. Both tips must be washed is mailed right along with all other sub­ worked out very well as built. Plans are out, but the main panels should be scriptions. Let’s see how many of you to move the towhook slightly forward, fla t.” can beat him to the punch! tissue the stab (in place o f mylar), and MODEL BUILDER Free Flight re­ (January's Mystery Model brought do a few detail changes. The T-tail has commends the Schlitzer as a Nordic to about one o f the largest number o f

What is Steve Helmick really like? Who else would stand in the shade What the well-dressed Easy-B indoor model looks like. Ship held in when it's raining? Ed Lenderman about to launch A/2 Nordic. place by model clamp designed to look just like a clothes pin!

DARNED GOOD AIRFOIL - EIFFEL 400

* ~~~~~~~~ '

STATION 0 1.25 2.5 5 7.5 10 15 20 30 40 50 60 70 80 90 95 100

UPPER 4.8 6.6 7.5 8.8 9.8 10.5 11.9 12.8 13.1 12.6 11.6 9.9 8.0 5.8 3.7 1.7 0

LOWER 4.8 3.4 2.9 2.0 1.4 1.0 0.4 0.1 0.1 0.8 1.4 2.0 2.4 2.2 1.3 .71 0

MARCH 1976 51 Stabilizer mount Stab incidence is 3 degrees negative Stab Mylar— covered Wing — Tissue covered

OJ OJ Two 1 /8 " dia. wires Center section flatis MODEL BUILDER responses we've had in the series. In fact, Vic Didelot, Erie, Pa., sent along photos o f his version o f the model, along with his correct entry. However, Jim Sullivan, o f Lexington, Massachusetts was the "firstest with the mostest." The model was Frank Huffman’s "Li'l Richard," published in April/May 1961, Flying Models, and we can't help but wonder if Frank took structural design lessons from FM's editor, Don McGovern. It sure looks like a typical multi-sparred, multi-ribbed McGovern balsa behemoth, wen) CIAM CHANGES If you are an FAI flier, the chances are that you wait, with some baited breath, the results of the annual meet­ ings of that organization (the CIAM). Usually, there are substantive rules changes proposed. These would change the current events in many ways. A- mong those considered during the 1975 meeting were: 1. Nordic: Change length of launch­ minute fly o ff launch period, re­ sponsored what has become known as ing cable (towling) by decreasing placing it with a 15 minute launch the Coupe d’Hiver Internats. Usually length to 35 meters (USSR pro­ period. Establishes a starting line held outside Paris in February, the event posal) for power flyoffs. this year (1975) was switched to R.A.F. : Towline must be attached directly 4. Coupe D’Hiver: Clarifies by add­ Halton, just outside of London, Eng­ to the tow ring. The tow ring ing, "Minimum weight o f the mo­ land. The following report is submitted must be a homogeneous closed del 70 grams, not including rub­ courtesy of Ron Moulton, with addi­ ring (outlaws spring-and-ring sys­ ber m otor.” tional comments by Dave Goodwin of tems). (Finnish proposal) 5. Indoor: Allows steering o f model the Vulcan F.F. Group. 2. Wakefield: Change the maximum from front of model only. Also "We tried our best to convince the weight of the model without the defines attempt as 60 second min­ French that the grey mantle o f cold motor to 200 grams. (USSR pro­ imum time. dampness that smothered the U.K. posal) 6. E.Z.B.: Referred to committee for through the last day of November was : Reduce maximum motor weight further study was the adoption of exceptional, but the message didn’t get to 30 grams (USSR proposal) Easy-B rules. through. They’ll say we were trying to There were other proposed changes, International Competition Dates and excuse a tradition. On the European too. I just excerpted several which Sites: Established Indoor World Cham­ Continent, everyone expects to find fog struck me as wrong. Many of the items pionships site as Cardington, England in England at this time . . . and we covered in the 8 page outline had com­ for August 28-30, 1976. Outdoor Free weren’t letting them down! Actually, it mon sense reasons. The results from the Flight: Offer from Finland withdrawn. rained so much on November 28 that meeting’s decisions have now been dis­ No other offers received. the whole country swelled up like an tributed and, happily, they represent COUPE d ’HIVER SWITCHES SITES over-leavened loaf o f bread and hit cooler thinking on the part o f the dele­ AND DATES cloudbase! gates. The only substantive changes For years and years, the French have "Many were the tales o f ice faired have been in fly o ff procedures meet or­ aerials and wing mirrors on cars that ganization, age o f contestants, and steer­ loomed out o f the clag at Halton’s air­ ing of models (for indoor). The above field gate, from parts as far away as Nordic and Wake proposals were thrown Yorks, Lancs, Somerset and Kent, and out. it says much for the rose tinted opti­ In substance, the rules changes are as mism o f aeromodellers that many were follows: actually on the apron waiting for the 1. Flyoffs: For all future W/C, flying start at 0900 hours. Visibility at that in non-thermal parts o f the day time was 50 metres. Exploratory checks are required. with chuck gliders showed that the air 2. Nordic Glider, Attempts: (defini­ was surprisingly bouyant: When a tion) "When the model or the couple o f R/C electrics were put to­ launching cable collides with an­ gether, hopes were raised for discovery other cable during towing and the o f the vertical visibility and sure model is released from the cable enough, the Kloudrider could be seen within 1 minute from the moment for all o f a hundred feet upwards. Yuck! o f linecrossing, should the model After cavorting around, the whirring continue its flight in a normal soarer ditched itself into the frosty manner, the competitor has the grass . . . frozen out of the sky with right to demand the flight be ac­ great globs o f ice all over its wing and cepted as an official flight, even if the elevator gap filled solid. Brrhh! the demand is made at the end o f "Meanwhile our French friends and the attem pt." Bill Hunter and what else? A' hardly-decorated- just a few British diehards were showing 3. All events: Deletes the old four at-all Satellite 1000X. Southwestern Regionals. Continued on page 60

MARCH 1976 53 ' l 1 · U-w Γ ΙΙΙΙΙΙΙΜ 'Γ 1 1 « 3 X - \ |M — 1 . X E * k ill__ 1 f k i

Our "Trident II" out for its shakedown cruise, takes on a full-size Soling in Newport Beach Wide spread of outriggers affords great stability Harbor. Hate to rub it in to our friends back east, but this photo was taken in January! w ithout needing deep keel or heavy ballast.

PRODUCTS IN USE By BILL NORTHROP

The PROBAR 36-600 R/C TRIMARAN "TRIDENT II" and SAIL CONTROL UNIT.

• The “ Trident 11 ” is a radio controlled, beam may seem to be strange dimensions lighter (only 6-1/2 pounds), and the 36-600 racing trimaran, produced in for a boat, but in this case, it stands for slightest breeze gets it moving like a kit form by ProBar Design, P.O. Box the length o f the main, or center hull, scalded cat. Conversely, the light 639, Escondido, Ca. 92025. The selling and the center-to-center distance between weighted boat will lose headway almost price is $100.00, or if you are more the two outrigger hulls. The trimaran immediately if the air is dumped out of accustomed to bargain pricing, $99.95 configuration has many interesting and its sails, so it is necessary to sail full . . . plus a nickel for old time’s sake. different sailing characteristics from the bore right up to the mark and then Trident prototypes won the 1974 and more common monohull, not the least come about quickly before momentum is 1975 ACCR Regattas for the 36-600 o f which is its fantastic acceleration. lost. class. ProBar, by the way, stands for This comes from the fact that the This writer, though not currently an Don Prough (pronounced “ Pro” ) and trimaran gets its stability from the out­ active R/C sailing skipper, has owned Bill Barton; designers, producers, and rigger hulls, and therefore does not and sailed a Santa Barbara One-Design winning sailors of the Trident. require the deep, ballasted keel of the since 1965. Our first S/B came directly A 36 inch over-all length and 36 inch monohull. Consequently, it is much from designer, Tom Protheroe, before

High impact polystyrene molded hulls are Plastic sheet fits over all radio and servo fittings so that main and jib sheets w ill not foul and tough and maintain a brilliant white. cause a jamb-up. Mark on coaming is the balance point. Molded sheet exit guide ahead of mast.

54 MODEL BUILDER I Mahogany plywood radio mounting board fits through deck opening Operating lever to sail control lim it switches is located between two for easy removal. MRC servos and Probar sail control unit installed. adjustable override springs, to prevent servo burnout. production was taken over by Vortex. building instructions. for fit in the hull. However, it should In 1970, we took possession of our The toughest job in constructing not be glued in position unless the deck second S/B, No. 319, on a Saturday, this boat is the shaping, sanding, and is in place on the hull, glued or not. and placed 7th out of 15 in a regatta finishing of the wooden parts, in fact, Reason for this is that the open hull the next afternoon, in the harbor at if you get these out of the way first, spreads a little, and the deck pulls it Santa Barbara, California. Since then, the rest of the assembly is a breeze, and together to its normal position. unifortunately, it has only been in the in fact, interesting, because it goes The second suggestion is that, with­ water a few times. (With our newest together so rapidly. out exception, the sheet exit guides home being about 50 yards from the We finished the rudder, keel, and should be installed in the deck before water in Newport Beach, the S/B will cross beams by shaping with a course the deck is finally glued on. We did it probably begin to see more action.) rasp, followed by course, medium, and according to the instructions . . . after the deck is installed. Aside from turn­ Because we thought it would be fine sandpaper. Two well-brushed-out coats of K & B Super Poxy coating resin, ing the air blue and flirting with an helpful to ProBar to show that an each followed by sanding, and then a ulcer, there just ain’t no good reason for amateur could easily build the Trident final, thinned coat o f coating resin, left putting them in after the deck's in . . . and because we selfishly wanted to all parts with a smooth, polished finish, place! Incidentally, the exit guides are add it to our own collection . . . we which was left natural. The grain in the available separately at 50 cents each, took on the project o f reviewing this and are very effective in providing a kit! mahogany cross beams came up beauti­ fully, without any need for staining smooth passage for any lines that must The Trident kit consists o f 3 hulls before applying the Super Poxy. operate through the deck. and decks, all molded of high impact polystyrene plastic. In addition, the The remainder o f the construction is Radio installations will vary, depend­ kit includes an aluminum tube mast, simply a matter of following the de­ ing on the system used, and the sail hardwood dowel material for main and tailed, illustrated, step-by-step instruc­ winch employed. We installed the jib booms, pre-cut mahogany outrigger tions. We would recommend two ProBar winch, which sells for $50.00 cross beams, plywood keel and rudder, changes in the sequence, however. ($49.95 plus a nickel), and used a Mark and all hardware and rigging materials Before the deck o f the main hull is V MRC radio with two separate servos. required to complete the boat, less sail glued down forever, it is easier if the The sail control winch is simply an winch and radio control equipment. radio mounting board is fastened to the electric motor and an all-metal gear Completely finished and sewn dacron mounting rails and the assembly checked train which provides 40 inch-pounds of sails are also included, along with an effort through a rotary output, for assembly drawing, and 24 pages of hauling in and letting out the sails. excellently written and illustrated Continued on page 77

Keel is mounted through slot in hull and epox- Extremely light boat is more ON the water ied inside only. Ply thwart plate adds rigidity. than IN. It accelerates rapidly in any air.

MARCH 1976 55 Glenn Stone's twin-beam independent front suspension system. It's Block clamps end of one axle beam, and is slotted for vertical m ot­ rugged and practical. ion of other beam. Slot gives some friction damping.

R/C AUTO NEWS By CHUCK HALLUM

• Competition suspension systems are motion of each end would be a little suspension is very rugged, ‘cause I’ve few and far between, but we’ll look at a higher before we got into problems. All never seen Glenn Stone out o f a race be­ couple that were run at national events, o f the competition suspension systems cause o f it, and the car has taken some and some more that have run at local I’ve seen so far have only been on one pretty hard knocks, as any competition races. The biggest problem with good end or the other. So I don’t think the car does. There are a couple of limita­ geometry suspension systems is that full benefits o f suspension have been tions o f this front-end set-up: 1) the can­ they are fragile. Competition suspen­ seen on the track, yet. tilevers must be strong enough to main­ sions have to be rugged, and quite often, I have seen only one reasonably good tain king pin location, both angular and compromise on good geometry. But front suspension system for competition fore and aft, and 2) there is no adjust­ there are several guys still giving it a try, so far. Glenn Stone has modified his ment o f spring rate. Since strength de­ with some good results coming out of Thorp front end so that it uses two termines the minimum cantilever bar their efforts. cantilever bars, one for each wheel, size, the spring rate cannot be decreased We looked at the suspension effect rather than the single one with center below some value, but clamping the can­ of the basic plate chassis and "rocker pivot, "rocker,” on the stock chassis. tilever at different positions could pro­ suspension" systems in the first article One of the photographs shows Glenn’s vide a variable adjustment, if necessary. o f this series of two. The general con­ set-up. The cantilever bars, which look There have been other types of front clusions were that only a little motion like a Ford pickup twin I-beam suspen­ suspensions, like upper and lower A- was required, and damping was very im­ sion, run through vertically slotted frames on the old Dynamic and Racar portant. In general, the cars discussed in blocks at the outside to allow vertical chassis, but they couldn’t take the abuse the first article only had a “ rocker” on motion, but restrain fore and aft mo­ o f competition. The suspension action either the front or the back, and this in­ tion. The cantilevered bars provide the was good, but complicated and delicate. fluenced the conclusions. If both ends springing and the slotted blocks give The Futaba Dune Buggy has front sus­ had motion capabilities, the allowable some friction and damping. The front pension with upper and lower arms, with

Gary Walker's independent rear suspension system. Ball joints are on Vertical motion of each wheel is about ± 3/8 inch. Spring and damper front of two arms from each axle corner. towers to rear of each axle carrier.

56 MODEL BUILDER Suspended power pod on Ted Longshaw's car (He's from England). Bottom view of Ted's car shows flex-plate and stabilizer bar for var­ Upper arms stabilize and restrict motion to the vertical plane. iable roll rate. Note large, supr-quiet m uffler. ball joints, rubber bushings and torsion each arm is a ball joint. Bolts secure the cogged belts on the IRS are quite loose, bar springs. The Futaba suspension is ball joints to the chassis through rigid to keep the bearing loads and friction to strong enough for low speed encounters blocks. I believe Gary has the trailing a minimum. One of the problems with with obstacles, but not for being hit by arms and ball joints staggered vertically true rear suspension cars, and Walker’s a 35mph, 6 lb. competition (?) car. The to attain some rear wheel camber is no exception, is that weight is pushed Kyosho Dune Buggy front suspension, change, with vertical motion, to aid free forward because o f all the junk at the with upper and lower leaf springs, is contact. Each rear wheel is driven rear. So in cornering, because of the fo r­ probably a little stronger (in concept), through a cogged timing belt/pulley ward weight and low rear roll rate, the and with some beefing up might be from a common jack-shaft. To the rear inside front wheel lifts quite a bit and good for competition cars. In any case, of each half-axle is a spring tower, front traction drops, hence, a very un­ it appears that more design work is re­ which includes an air damper. The dersteering car (the same problem as quired to get a good front suspension spring/damper towers are pivoted, with the rear rockers discussed in the system. through rubber grommets, at both the first suspension article). More effort has really been spent on top and bottom, so there is no alignment A t the 1974 ROAR Nationals, I ran suspension. That’s where it should do problem. a rear suspension car. The layout was the most good, but it’s also the most d if­ Walker’s IRS car is fairly reliable and relatively simple, but nowhere near ficult. The only rear suspension car that rugged. The car is unmistakable. Here on strong enough. It stayed together well is run with any regularity that I know of the West Coast, when his car went over during shakedown runs at home, and belongs to Gary Walker. Gary’s system a “ Botts-dot” , the rear o f the car would was running laps under the existing has been running for a couple of years, bounce up and down for a few feet, but track record. A t the Nats, things went with limited success, in various types of the wheels seemed to stay on the track well in the qualifying heat races, butone cars. One o f the photographs shows pretty well. In stock cars, a small sedan good whack in the rear end in the main Walker’s approach to independent rear body, it seemed to work very well. But event and I was in and out o f the pits suspension (IRS). Each wheel is mount­ in sports cars, the weight seemed to be for the rest o f the race. Anyhow . . . ed on two trailing arms, and wheel mo­ a disadvantage, and he never seemed to another photograph (or two) shows my tion is essentially vertical. The front of have quite enough front traction. The Continued on page 77

The author's 1974 rear suspension system with cog belt drive and One of the author's rear suspension attempts that didn't work out. cantilever springs. Dampers outside of each rear bearing block. Chain drive worked well, and w ill go on next system.

MARCH 1976 57 Fokker Triplane and Sopwith Camel airplane The Giant Skyscraper is a current favorite among scientific kite enthusiasts. It was designed by kites by Stratton Air Engineering. They are Ray Holland, and is produced by Airplane Kite Company, which supplied the photo. built in the same way as model airplanes.

IT IS ALMOST THE TIME OF YEAR TO GO FLY A KITE! By KEITH GEBERS . , . Just as model airplanes have a "to y " image to "outsiders", kite flying must live with the "dime store two-sticks-and-tissue" image. It ain't true with them like it ain't true with us. Read about it.

• Kites are no longer JUST for the principle and it became very popular, very young. Today, a whole new genera­ and has even gone from there to the tion of kite enthusiast looks at his hob­ field o f hang-gliding. These parafoil kites by as a science, and unlike twenty, or can be made extremely large, or very even ten years ago, many of this new small. Many enthusiasts have even con­ breed are also model airplane builders. structed them from a sheet o f typing Today, a variety of kites, both commer­ paper. cially and scratch built, will appeal to Another advancement in kiting came the most avid model airplane enthusiast. with the design o f the Flying Sled by The new generation kite flier views a Frank Scott, son of Sir Francis Scott, kite as an aircraft, not merely as a toy. also o f kiting fame. Sled-type kites are They have found that there are as many marketed by a variety of commercial aerodynamic factors in a kite as any producers, and can be easily scratch- other airborne device, as well as an built with everything from plastic sheet­ equal number o f challenges. The turn of ing to paper. Sleds can be flown com­ events in modern kiting came in 1940 During the early years o f the Space pletely tailess and are very aerodynamic, when Francis Rogallo patented his flexi­ Program, experiments were conducted thus appealing to the aeromodeler. Their ble parafoil. For years this device was to make the parafoil a re-entry vehicle, vented surface literally rolls with the considered by the m ilitary for full scale but storage problems could not be sur­ wind, and although sometimes rather aircraft, and some prototypes were mounted. Kite builders adopted the tricky, they are dependable, fun flyers.

Scratch-built airplane kite designed by the author features balsa wing Flexible parafoil kites don't have to be large. This one made from and tail surfaces. Flexible keel/fuselage is a sheet of typing paper. one sheet of typing paper and 1/16 square balsa.

58 MODEL BUILDER P A X Jungmiester is bottom view of plane painted on transparent Another example of a sheet plastic "sim ulator" kite. This P-47 kite flight surface. West German im port displayed by author's son, Mike. was made by the Knoop firm , of Holland. Model airplane builders might find Balance, lightness, and drag seem to be their biggest kite challenge with what is all-important in constructing a success­ known as the airplane kite. This field ful airplane kite. There have been some remains wide open for design and con­ airplane kites built much like a profile struction innovations. A whole core of model plane. The vertical position o f the airplane kite enthusiasts exists, among fuselage provides a nice vane to keep them Ray Holland, Craig Stratton, Gary the kite stable. But even so, they are Hinze, and Bill Bigge. These men fre­ not always successful. Give airplane quently correspond with the author, kites a try. As kite authority Wyatt telling each other about the latest in­ Brummitt says: “ Airplane kites can be novations they have created. built successfully, but it takes an awful lot o f skill and patience.’’ For years, an airplane configuration was not considered suitable for kites. An airplane is designed to fly forward; k ------2 5 " ------velocity being the name of the game. A In the air, the Gunther Bonanza "sim ulator" has been mistaken for an R/C model. kite works just the opposite, with the forces of the wind pushing against a tethered object to gain lift. Thus sta­ | < ------4 0 " ------bility in an object with such small lift- ting surface as an airplane is difficult to achieve. Frequently an airplane kite will just spin on the end o f the line, or if stable (like a tow-line glider), it will forget it ’s a kite and continue its for­ ward movement right over the flier’s head and into immediate trouble. Numerous theories have been ad­ vanced on airplane kites. One is that a kite is merely an airplane that flies back­ ward. Experiments have been conducted where a very light model plane is te­ thered at the tail. Some o f these experi­ ments have been successful, others not.

Built-up airplane kite, designed by the author, features model air A simple, small rigid-frame kite w ith center fuselage and outriggers. plane-type construction. Open fuselage gives boxkite stability. Extremely stable, it needs no tail.

MARCH 1976 59 Spad...... Continued from page 47 Write For FREE BROCHURE to the fuselage. When we built our first On Our Complete Line Of biplane waaaay-back when, the local club expert told us to build in a bit R/C PROPORTIONAL EQUIPMENT more incidence into the lower wing in c lu d in g than into the top wing. Apparently this causes the lower wing to stall first WORLD'S SMALLEST SUPERLIGHT . . . the plane remains a relatively stable high winger. Keep in mind that a care­ DIGITAL CONTROL SYSTEMS fully aligned and rigged airframe is one secret o f successful flight. SMALLEST SIZES LOWEST PRICES Two wings produce a considerable 13400-26 Saticoy Street amount o f lift, so more weight than usual is required in the nose of a bi­ North Hollywood, Calif. 91605 plane. A propeller carved from bass Phone (213) 764-1488 wood is the easiest way to get this weight. Where do you get bass wood and views o f real planes, thus from the have it cut to outline shape? Visit the ground, they look like an actual air­ Industrial Arts department o f the local craft. junior high school. They usually have The author was flying a Gunther bass wood, and the instructor will cut Beechcraft Bonanza in front of his you enough prop blanks for ten years o f home and a group o f high school stu­ model building by just coming in with a dents drove their motorbikes over two few of your models and talking to his miles just to see what they thought was classes. the town's latest radio control model. Use the "old tall grass” bit for test In addition to the Bonanza, there are gliding your model until it is trimmed now available from either Gunther, out. We used one loop of 3/16th in. rub­ Knoop, or Pax a couple of jet fighters, a ber for power. It provided enough Bucker jungmeister, a P-47, and a Good­ oomph to permit the model to R.O.G. year Racer. (rise off ground). You might have to use 60 IS A LITTLE BIG ??? Kites have always been described, more or less power depending upon the even by model airplane buffs, as relax­ weight of your model. · THEN TRY THIS NEW ing. But to the new breed o f kite enthu­ siasts they go a lot farther. There is FOX 40BB F / F ...... Continued from page 53 enough aeronautical challenges in the a mixture of impatience and blind hope modern kite to whet the appetite of the by putting a few Coupes together. As most ardent model airplane builder. But The Fox lOBB lias all the things you want precious daylight hours slipped by, and plus some you haven’t thought about. don’t completely overlook the so-called the field became alive with scattered Schneurle Porting* garden variety kite available at the toy bodies chasing strange silent shapes 2 Ball Bearings on Main shops and quite a few supermarkets. above, the visability improved to all of a Cylinder - Unique 9 port design. Many of the new ones reek with sophis­ Carbo minded for long wear. hundred metres by 11:30. Piston - Aluminum with free ring. tication. During recent years, inflatible “ From nowhere but the model box Super sturdy construction. kites have made their debut. These re­ and small knapsacks, the French ex­ quire a good, hard, steady wind, and tracted tents, Nelly boots, 20 ft. ther­ have disappointed many novice kite FOX 40BBRC 24100 59 95 mistor masts, floating d rift streamers FOX MOTOR MOUNT 50404 4 50 fliers. But the inflatible kite provides a and all the paraphenalis of professionals FOX PROP EXTENSION 90413 2 25 beautiful airfoil structure. When well . . . They’d seen the new trophies; FOX SPINNER 60308 9 00 balanced with a healthy wind, they can Maurice Bayet’s Coupe de Paris for FOX TUNED MUFFLER 90302 19 95 afford hours of enjoyment. 100 gr. models, and the Aeromodeller Providing tremendous help to the Trophy commissioned from Ian Dow- FOX MANUFACTURING COMPANY serious kiteflying fraternity is the Amer­ Γ>305 Towson Ave. / Fort Smith. Ark. 72901 sett for 80 gram models. It ’s such a ican Kitefliers Association, Box 1511, beautiful piece of art that it possibly Silver City, New Mexico, 88061. For accounted for all the over-wound broken There are really two types o f air­ four dollars per year, members come in motors o f the day. Ian made a scaled plane kites. First, the real thing, which contact with other kite fliers with simi­ down Coupe in silver plated metal, de­ has just been covered. Then, there are lar interest, in addition to a beautifully signed a mould, produced a title plaque simulators, which are really conven­ produced quarterly magazine, edited by and had the job set in clear acrylic. The tional transparent kites with airplanes A.K.A. president, Bob Ingraham. All result is something to treasure . . . a printed on them. These are called plane- types o f advanced kites are covered in superb honour for the winner to keep type kites, and are generally frowned this publication, in addition to simple for the year. And quite a few eyes upon by airplane kite enthusiasts. How­ dime-store kites, as well as plans. glowed at the thought o f taking it ever, some recent examples are out­ The field is still wide open. Kite home. By 11:45 the barbeque had standing. The best ones are made by builders are experimenting with highly been set up, so that at least there was the Gunther Flug Spiele o f West Ger­ maneuverable kites, equipped with ad­ to be some action, if only to raise a man many, which is one of the w orld’s lar­ justable rudders and elevators. Experi­ made thermal. General bustle gave an gest builders o f kites and aerial toys; ments have even been conducted with impression that the contest might be the Pax Company, also o f West Ger­ radio controlled kites. viable, so control was established for a many; and the Knoop Company, of The challenge is there! Build a kite, start . . . 3 hours late, and about 300 Holland. What makes the latest types so feel the tug o f the line, and get bitten by metres out into the eerie grey of a attractive is that they feature bottom the bug. Go ahead! Become a kite-naut# seemingly endless void.

60 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER “ To cope with the conditions, time­ keepers were allowed to follow under the model. D rift was a mere 3 mph, and VL-101 ELECTRIC FLIGHT SYSTEM F e a tu rin g tests had shown that 90 second flights HYTORK 48 were easily followed from launch to MOTOR & PLANETARY GEAR UNIT touchdown. Complete flying weight 2V» oz.------w ill power “ So at noon, the first official flight M odels 25 to 50" wingspan weighing up to 10 oz. was made by Peter Cameron . . . and ^ > Send 25Í for Catalog showing com­ when the timer came back with the . / plete line of Electric Flight Equipment card, it was a max. Two minutes up­ and Accessories wards until d.t.ed. Second flight by Len JLJ VL-101 System $19.50; Hytork 48. Ranson went the same way; but the d.t. Prop and Instruction Book $9.00; Fast failed . . . and within the first quarter Chargers $14.50 to $29.50 hour, we had seven maxes on the score See your Model Dealer or order Direct cards.” PRODUCTS (add 10% for Postage and Handling - DIVISION OF VISTA LABS “ So it went. Through just over three Calif. Residents also add 6% Sales % 7023-D Canoga Ave Tax) send Check or M.O., No. COD'S hours o f the weirdest, yet most pleasant W/Λ Canoga Park, Ca. 91303 Hobby Dealers send for Information contest flying in ages. Out of 266 flights recorded, almost a third were maxes, and despite the visual limitations, only three models remained lost at the end. Stearmäh C 3 B One o f these was Claudine Dupuis,'the GENERAL only lady competitor, whose husband A ris to c ra t dominated both classes. One might say the British were 'Duped' by this dedi­ cated pair from Chatelleroux. Louis H(JiF Afanocotifie ■åsågs 1/7 ‘ WMOSRAN FOR NUB BCR, COŽ. $5 wingwa*. 049 POWER row n á m w b m iw v»* 22 (like all others from France) was delib­ OR « 0 ROWER A * T OR WOSTAtKA FOR RA0»O CONTROL UR TO THREE CHANNELS OWC Of THE OOLOCN ERA'S BREATtST AM CRAFT ANO A 0CLIBMT TO M L O A W9T0AT MAKER 1C FORE WORLD WAR II erately flying at over 100 grammes UN weight in the 80 gramme class to ridi­ AMERICAN cule the claim that the 20 grammes BELLANCA makes any difference. In fact, he won ‘‘M> » riic k fl ~ the 80 gr. class with a 107 gr. model, came 2nd in the fly o ff and 4th in the W P IP BP. CUB

100 gr. class, to total up to 10 maxes »4* W1N0SRAN. 020 ROWER FOR FREE FUQHT OR RADIO CONTROL Rl ANS 0NLT in eleven flights! He was beaten only by SS* WIN OS PAN. .020 ROWER FOR RULSC AND SMALL MULTI-RAOO French C.d.H. champ, Bernard Boutil- CONTROL UNITS CAN BE FLOWN FREE FLI0HT ON ROWER OR RUBBER lier, with a better flyoff decider, and ON DIRECT ORDERS ADO 10% FOR PACK IMG AND ** ” POSTA1C. VA RESIDENTS A00 4 % TAX. FLYLINE MODELS even then, with his own motor which he •SEE YOUR LOCAL HOBBY DEALER· 10643 ASHBY PL FAIRFAX. VA 22030

100 Gramme. 3 x 120 seconds. R.O.G. 26 entries RESULTS: 80 Gramme, 5 x 120 seconds. Hand Launched 41 entries 1.Bernard Boutillier France 360 =/= 113 fly o ff 2. Louis Dupuis France 360 =/= 88 fly o ff 1. Louis D upuis France 600 secs. 100 gr. model 3. Frank Monts U.S.A. 303 "old" Chicken Coupe 2. George M atherat France 586 secs. 100 gr. model (proxy: O'Donnell) 3. H enry Tubbs G.B. 550 secs. 80 gr. model 9. Bob White U.S.A. 234 "Beaucoupe" 8.Bob White U.S.A. 519 secs. 100 gr. "Beaucoupe" (proxy: Chaussebourg) (p ro x y : P. Chaussebourg 11 .D ave Linstrum U.S.A. 214 "old” Spirit 15. Dave Linstrum U.S.A. 479 secs. 80 gr. "Rubber Duckie" (proxy: Chaussebourg) (p ro x y : P. Cameron) 12.Charlie Sotich U.S.A. 207 "B ig S h o t" 23.Fudo Takagi U.S.A. 436 secs. 80 gr. 10 yr. old model (proxy: Goodwin) (proxy: Johnson) 1 3 .S tuart Savage Canada 195 "G a n n e t" (proxy: Dowsett) sportingly loaned. Ice on the propeller MODEL BUILDER Free Flight, I fea­ Fig. 1 blades, frozen fuse, soggy tissue, and tured a simple Circle Tow system which masses of rubber breaks (one entrant had been worked out by John Lender- broke 14 motors), some spectacular man and the author. As soon as the mag­ climbing episodes, gallons o f coffee and azine hit the newstands, I received 3 pounds of sausages and beefburgers con­ letters (in fact, I received one letter be­ Modify the swinging arm by sumed, will be remembered as part o f a fore I got my copy of MODEL moving hole for rudder line true Winter Cup story. BUILDER). All three, Tom Hutchin­ to 1.2" from pivot point. “ By 1600 hours it was dark and the son, Steve Helmick and Bob Hatscheck entourage moved o ff to the Sergeant’s pointed out a very obvious error in the Mess Annex, where warmth and prizes 3 views presented. Additionally, they awaited the first 28 in 80 gramme and made some suggestions for improvement I all 26 who flew in 100 gramme.” o f the system. I take the liberty o f pas­ 1/16" Aluminum sheet Special note from Dave Goodwin: sing them on to you now. Matherat and Boutillier flew huge First, Hutchinson: “ It is very impor­ This sheet is cut to the size of the bottom models (280 sq. in. wing) approximately tant that the swinging arm have some width of the fuselage and slotted. Bolts or 50 inch span with 23.6 x 21.6 prop on wood screws are then used to fasten this sheet sort o f mechanism to stop or lim it the to the fuselage (as in Fig. 3). By loosening 6 strands and 52 second prop run. forward travel.” (This was also pointed screws, the sheet can be slid fore or aft until CIRCLE TOW FOR A LL OCCASIONS out by the other two. See sketch which proper setting is obtained. The screws are REVISITED corrects this error). then tightened. (Suggestion compliments of In the December, 1975 issue of Ron Davis).

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 61 forward slant of the lever and that way get a zoom rudder effect as the glider comes up on the top o f the line. For timer and plunger release system, I’d suggest using a heavy monofilament pin such as Jim Walters uses.” “ Hatshek (who bills himself as the w orld’s leading expert on flawed tow- hook systems): “ The hook must have a forward stop for two reasons. First, as presented, all forward pull on the sys­ tem is applied directly to the rudder '3 K J horn and adjusting screw. This is too much. Second, the hook must have a OF rearward rake angle so it doesn’t come ...th e o ff the forward stop when the glider is most kiting straight overhead (again, see powerful sketch).” Bob passes along some other THE production good points and food for thought, but 6.5cc. engine ever built! these will be covered in future columns. For right now, get out your Decem­ ber issue o f Model Builder and turn to C3=> 6.5cc. page 48. Using this sketch and the sketch included in this m onth’s column, you should be able to modify your sys­ (.40) RSffl tem so that the above-mentioned flaw can be corrected just in time for the up­ It's NEW! coming contest season. With all o f the above, there is no It's POWERFUL/ space for a humor section this month . . . Hey . . . Who is the guy in Possum’s Breath, Arkansas, who said, “ Thank It's a K&B... Heavens?” I heard that! ·

The K&B 6.5cc. RSΙΠ has been F/F Scale...... Continued from page 43 exhaustively tested in actual R/C fuselage in red Japanese tissue and the boat races... it’s a winner! wings and tail in white. I gave the fuselage four coats of clear dope, the Design features include: wings only three, and the tail just two. • ABC Piston & Liner—for longer life · Advanced By-Pass Porting I use nitrate dope exclusively . . . • High Density Aluminum Die Casting—for greater strength plasticized with tricresyl phosphate. • Con Rod—bushed both ends · Water-cooled head · Ball Bearings Now is the time to mix some paint • Exhaust Butterfly Throttle · Beefed-up Shaft for the Monocoupe. I use the smallest • Rotatable case (center block)—permits changing of exhaust from baby food jars available, since very little forward to aft position. is needed. Mixing more paint than you SOUNDS GREAT! IS GREAT! need results in waste, and with the prices o f everything nowadays, one can’t Watch for our all new K&B 3.5cc. Inboard and Outboard engines. afford to be wasteful. Another reason K&B .. .the engines that have long led the field in R/C Flying . . . now, also, lead in you don’t need much paint is that R/C Boating! Floquil covers very quickly. I start with 1/3 of a jar o f uncut, clear nitrate dope. K&B MANUFACTURING This is followed by the plasticizer, and thoroughly mixed. For the Monocoupe, 12152 WOODRUFF AVE., DOWNEY, CA. 90241 I used Caboose Red, and Reefer White. I add about 1/3 to 1/2 of the bottle of ‘‘Additionally, the swinging arm less 2/56 screws with a .032 hole in them caboose red into the dope and again should be raked back about 15 degrees for attaching the line. I twang my magic mix thoroughly. I then thin the dope from vertical in the straight rudder twanger by plucking the taut line like a 50-50. For the white, I do the same position to get the model circling when guitar, which is a better way of describ­ thing, except I use at least 1/2 of the I want it to.” ing the action than merely “ abruptly bottle of white, or just a bit more. Once “ John Clear’s plunger system is ideal released.” I have had no problems re­ again I strain the paint in preparation for the variable rudder stop. However, leasing doing it this way. for spraying. the drawings are a bit misleading. The "Thanks for being the first in print I first painted the wings and tail differential between circle tow and glide with this ideal circular-tow system and white, making certain that I have an position is less than 1/4 inch, which letting the rest o f the A/2 world know even coat on each of the surfaces, and calls for a much smaller piece of spring. about it. Don Zink and Ken Bauer that’s all. No more spraying is required By the way, DuBro makes a couple of placed 1st and 2nd with this system at on these surfaces. If you lay the paint items which are perfect for this. Their the Fresno Semis . . . look for use to on too heavy, you will get pin holes, threaded couplers for Kwik-Links are spread now that the world’s out." since the tissue’s pores usually are not 2/56 thread and can be used stock by Stevo Helmick suggests: “ With your filled with just a few coats o f dope. The masking down on the hollow end to se­ swinging lever arrangement, I suggest fuselage was painted red in the same cure the rudder line. Their rigging coup­ that you make your forward lever stop manner. After the wings and tail were lers are even better . . . these are head­ adjustable, so you can crank in a slight thoroughly dry, I masked them o ff 62 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER where I wanted the red trim. I use drafting tape for this purpose, since it doesn’t have as much adhesion as regular masking tape. With this tape you don't have to worry about tearing the tissue covering. The edges o f the tape are DO THE sealed with clear dope to prevent the color from slipping under the tape and giving a rough edge. A light, even coat of red was given to the leading edges of HOBBYPOXY the flying surfaces. Immediately after spraying, I remove all of the masking very carefully . . . the paint sets-up quickly. The contrast between the two TWOSTEP lightly painted surfaces o f red and white make a pleasing sight. The easy way to a “ Standoff Finish” * After the model was completely assembled, the decals were put into the proper place with the aid of Walther’s Solva-Set. This solution softens the Brush on a coat of decal and makes it snuggle over every little nook and cranny. When the decals 1 Hobbypoxy color. have completely dried, I spray them with Testor’s Dull Cote, which eliminates the high gloss, blending them in with Brush on another coat of the rest of the finish. The overall weight Hobbypoxy color. increase is so slight that there will be 2 virtually no penalty involved for finish­ ing your model this way, and still it has Okay, okay, it’s not really that simple, but the transparent look that gives rubber models such character. It also beats almost! You should sand the balsa before cutting tissue paper for trimming step one, then let the paint dry thoroughly purposes! and sand it before step two. Will you On gas models (even on my R/C jobs), I still prefer to use Floquil. It settle for the Hobbypoxy four-step? isn’t fuel-proof, but since I use nothing Seriously, this method will give you a but diesels anyway, I don't have to worry about fuel-proofing. If you use tougher, more flexible, more fuel proof, glow, then finish with clear Hobbypoxy. super-shinier finish than a half-dozen It isn’t that much of a hassle, and there coats of dope will. Cheaper and quicker, is no appreciable weight gain from this technique. Depending on the color of too. It’s ideal for the weekend flyer who’s the model, I mix basically the same way in a hurry to get in the air, and will have as before, except perhaps I may use all his dope-happy buddies eating their o f the bottle of Floquil in a lesser quan­ tity of dope. This way I’m getting hearts out. excellent coverage with little weight * For best results, view from two feet away. For an even better finish, increase. Light colors, such as Reefer add another coat or two. For a perfect finish, send for our free booklet. Yellow, do not cover as well as some “Hobbypoxy Painting PointersAsk for our latest color card, too! of the darker colors, so I use more A Division of Pettit Paint Co., Inc. pigment in the dope. I also apply more 10 Pine Street, Rockaway, N J. 07866 coats o f paint on a gas model. HOBBYPOXY PRODUCTS Another use I have for Floquil in­ volves the bright silver, again in the clear dope. I use this mixture instead finishing a rubber model, as used by the dye is diluted instead o f being used o f clear doping after water shrinking George James. George uses a dye called full strength, pastel colors are possible. the tissue. This has a couple of advan­ Dr. Martin dye. This company has The dyes are not cheap, but they go a tages. One, it is an ideal base for a something like 115 different colors avail­ long way. This method is mainly for model that is going to be silver as the able, and these can be mixed to make rubber models, since the finish is trans­ finish color, and two, silver makes an countless other shades. George first parent . . . typical of this type model. ideal base for any color, since flaws are covers his models with white tissue. He Several months ago, in MB's “ Over quickly seen and can be corrected prior water shrinks with an airbrush, to mist the Counter" column, there appeared to the finish color. Aluminum powder it on. He pins down the structure to a brief article regarding a plan and a in clear dope works the same way as dry, and hastens drying by blowing cool brochure which is available on the well, and can be picked up in art supply air over the structure, using the airbrush. Heath Baby Bullet. Along with these or Standard Brand Paint stores. Once the tissue has dried and become items, vacuum-formed parts for the As I ’ve stated before, I can’t say taut, Dr. Martin dye is sprayed on lightly, cowl sections and an epoxy cast engine enough good things about Floquil . . . building it up to whatever color inten­ were also available. I gave this bit of you’ll have to give it a try if you haven’t sity is desired. Clear doping is next, once information only a parting glance and already done so. I think that you will the dye has dried. promptly forgot about it. Then I got be highly satisfied with the end results. Interestingly, spraying scarlet over this packet of goodies in the mail, and * * * yellow tissue gives an orange color, blue couldn't believe what I saw! First, Now here is another approach to over yellow gives green, and so on. If there were these drawings for a 1 -1 /2 inch

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 63 64 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER AC 1976 MARCH o wo r pann t epn t the to respond to planning are who you His it! regret won’t you . . . able other several has also Gene finished. f o havepictures some ’ll I Pee Wee. Cox copy a plus letters, and numbers the f o Modem “ in appeared first they as copy as a as well 3-views, beautiful are on shown configuration different each with powered, electric gas, or asrubber, are They Heath. ihe f o model F/F scale can. Send them either to MB, or to me to or MB, to either them Send can. pleasesoasas so, soon do you done yet of those for Also, articles. me future giving are for you ideas the have appreciate and time the taken have who Dr., Scott 16 Studio, is,addressThomas avail­ have does he what him askof and listing line a a Gene for drop to while up in on size available peanut be each scales, from will different they and on, working presently ishe scalethat models a using version, power the building the framed have to plan I completely I one afternoon. in fuselage that it me, about Believe as brochure documentation. scale the usehis complete then a model, build scale can modeler from package a a is that which offer feels to has he enterprise, what outstanding this be to is which panel instrument the of page of a instructions, f o set complete drawings constructional original the of Included seen. ever than have people Bullet Baby most Heath more has the f brochure o The pictures drawings. the built be can model The magnificent! written your favorable comments regard­ comments favorable your written N.Y. Island, Long Sta., Huntington in available is your Heath beworth would It The as well. peanut R/C. to it get I as soon as jewel little this I’m and March, in contest a for ready it excited so got I rate. first is work the model. the used on F/F scale organization issue, and haven't issue, haven't and scaleorganization I F/F magazine. and column this ing all decalsarefor there and up, have cut be doesn’t to plan the that so templates of print glossy 10 x 8 an is there added Asan bonus, Manual." Mechanics/Flying 11746. a has also packet The Bullet. Baby the MOTOR KLEEN 3.49 Gene Thomas, the guiding light of of light guiding the Thomas, Gene In closing, I want to thank all of you you of all thank to want I closing, In '$79.95, ICAT INSTRUMENTS AIRCRAFT MESSERSCHMITT Bf 109 E LENGT^fliSQ r RD FGRA LUÍ GERMAN OF PRIDE {■li STANDOFF SCALE STANDOFF A MODE PRODUCTS EL D O M GAS MLE FBRLS FSLG WIH INTEGRAL ITH W FUSELAGE | FIBERGLASS ■ MOLDED CNP & EHUT TCS DCL, ACCURATE DECALS, STACKS, EXHAUST & "CANOPY in f OD INCLUDED. WOOD VE DG O M 19 I UDI COCKPIT BALSA G IN NO D LU C IN STRUTS, E GEAR 109 ROBART ME OF SCALE DWG. DETAIL, VIEW 3 FRWAL NTLE, OM OE. MOLDED CORES. FOAM INSTALLED, ALL FIREW . HN OTCIG DETSR, EL E MDL ULE SN YOU! SENT BUILDER MODEL ’EM TELL ADVERTISERS, CONTACTING WHEN 1 7 0 1 4 Y K C U T N E K E T A G H T U O S EW W IE V Y E L L A V O H r W i VFFE ny ouin o ta i t wie fel­ write, to is that for solution only to needs and enthusiasts, R/C O/T for of line a developing in interested is Otto Clark’s Larry in employed successfully offered, are 213-329- items at ignition call many can 4863), Gardena, (you Blvd., 90247 Harvard Ca., So. 17119 at d pr pu la wih a be so been has which lead plug spark ed dethermalizer hour one coils, as such cludes a beautiful custom exhaust, exhaust, custom in­ 40 beautiful the chair, Be­ a your $85.00. ff o at cludes fall . you . . fore offered conversion lows! Lettum know you are interested! are you know Lettum lows! course!) of (shielded equipment radio. ignition Futaba a using America, Miss etc. timers, ignition clockwork timers, nqe hoe ak ad aig spark racing separately! and sold Not plug. tank, chrome unique Schneurle .40 the f o size. .40 exception to in. with cu. .15 from ranging Otto engines. converted ignition O.S. f o know if there is a sufficient market. The The market. is asufficient there if know mind the writer of this excellent source excellent re­ this to of Bernhardt writer the Otto mind from call phone ot l pie ae n h $0 range, $40 the in are prices all Most O.S. engines f o selection complete ahas a took it available, engines of made GIIN CONVERSION IGNITION ttefloigades 131 . Mesa S. 19361 address: following the at lgSak . . . SparksPlug r, il Pr,C. 26. · 92667. Ca. Park, Villa Dr., The latest item received is the shield­ the is received item latest The located Co., Products 77 the Called With all the mention this column has column this mention the all With ul ze Deald Plans etailed D e Scaling iz S Full tic n e th u A F. 22 72 1 9 . IF L A C . A N I V O C Hardwood & Balsa aris P Cut Selected Machine et S. es le u R . M . .A S Meets W EIGHT 6 V i- / LBS. LBS. / i- 6 V EIGHT W RADIO 4-6 CHANNEL 4-6 .71 to RADIO .56 ENGINE LtPJb in 64" SPAN ING W IR MODELS MICRO P .O .B O X 1273 -A 1273 X O .B .O P r H ENGINE ADDITIVE ENGINE $ O** Z2 Continued from page 23 page from Continued

A TWO PART. TWO COLOR FOR EASY EASY FOR COLOR TWO PART. TWO A GRADUAL CURING. AVAILABLE IN IN AVAILABLE CURING. FORMU­ GRADUAL ESPECIALLY EPOXY IXING M AYT UE OY OTE. 2 OZ. 12 BOTTLES. POLY USE TO EASY CONSTRUCTION. MODEL FOR LATED 6 MINUTE EfOXY MINUTE6 $5.95 ED FR 049 - 1 P ER W PO .15 - 9 4 .0 FOR D LE A C S KWIKSET 5 "MISS AMERI " A IC R E M A S S I M " 35 9 1 TI R/C R E IM -T D L O z chan. 3 — oz. 0 3 S l eog fr school l nuh o o pete.' com to enough e g r -la d r a ly o o h c s a for enough all "Sm 4 8 In. Span Span In. 8 4 1 s. In. sq. 310 $27.95 <*

ovre OS egns fee b 77 by offered engines O.S. converted The general conversion price is in the 30 30 the in isTorpedo. price to Cox conversion general The from just motor embraces any about which offered, is service ability of old timer kits. O f course, the the course, f O kits. timer old of ability L TMR KITS TIMER OLD and the 1939 Comet, Zipper. The MKI MKI The Zipper. Comet, 1939 Sr., the Playboy and and Jr. Playboy Sailplane, Cleveland Comet Powerhouse, Taibi da, Gene past. dim the in only then and is Models Tyro while Powerhouse kits, the Coronet offers and Chuck Distributors that Gill mentioned also has column collectors are left are that kits original and Miss America R/C kits for .09 to to .09 for kits R/C America Miss and Power­ span inch 50 the offers Aero motor converted. want particular you the describing, Otto write to interested, if sorange, dollar 40 to conversion ignition custom a Products, lpe n Syokt (hla) are (Shulman) B Skyrocket and Clipper partial offers W) & P of W (the Wallock once mentioned been have seems to W, Playboy. the producing This accordingly. priced are and items, avail­ the is it about, queried been has 1 engines. .15 Micro- of Blumberg, Sam while house, Models, is now producing the Mercury Mercury the producing now is Models, is te eo Rne, icat So Aircraft Ranger, Megow the f o kits og Cmt lpe MI Mgw Kor­ Megow MKI, Clipper Comet Long, In addition to the standard line of of line standard the to addition In oee, h bget rdcr P producer, biggest the However, columnist this anything is there If In the new reduced scale models, Cal- scalemodels, reduced new the In

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65 & 2.30 ADHESIVE STICK STYRO \ A Note From M I N I ^ G LUE TIPS TEE BAR H u t , ALUMINUM EXTRUSION Wi Bfejfi£r\a AN "IN S T A N T GL υε GUN· ^ ^ > t SANDING BLOCK _ lo» un with RUFF-STUFF Jet’s Friends YOU WANT IT ^ > "S*ll «Jhtt··* itndpio«i’

In our last ad Jet’s Friends publicly • Won’t West Out time* $1.69 challenged Radio Control Modeler · . 9 9 c • HtwiyioUM W nď - $2.89 Magazine to actually test the Western Wind -our all cardboard RUFF STUFF M IN I * = r SANDER sailplane. ^ "SELF ADHESIVE SHEET JĚÉĚĚ ADJUSTABLE TENSION The Challenge was necessary « ίΓ sandpaper- HAND BELT SANDER mo«» because RCM had published a MAKE YOUR OWN SPECIAL FIRMLY HOLDS PAPER SANDING SHAPES FOR EASIER SANDING misleading "review of the Western · Ailmti to moil Mil·· m ^4* ψ»λλψ·\ r.»u «η«ι nm«i Wind without even trying it! · Honøy lo Ho kJ RCM never took up the · No mniy glu·. o« «Vying lun· 3 9 ( • E«ytoU»c $ 1 .3 9 challenge. If they had we know r 1 what would have happened. For A | -----V -^v APPLIED design corporation M I N I -STRIPS PRECISION OIECUT MeO.um G*n*t y M k D ö C ) «m <«omvii* w..vi SAVESTIME Λ Ο * REPLACEMENT Fin· G*n*l here’s what happened when Taylor AND EFFORT V SANOING 8ELTS. Aut o W·»» Proof Collins flew the Western Wind for a k ______a ______review in the January 1976 issue of Model Builder. In a very complete nor do they include plans. These items idea that Herb would not be able to article he said, "Since the ship is... must be obtained separately, wen) handle repairs and parts o f old Brown very inexpensive, a beginner can SAD NEWS Jr. motors needing resuscitation. No­ throw it off the cliff without being Seems as though it was just yester­ thing could be farther from the truth. terrified." "Your total cash outlay to day when we were talking to Joe Dod­ Herb is not only producing 375 of the complete the Western Wind, other son, former Hampton Roads Brainbus- 40th Anniversary Browns, but is also than for the radio, will not exceed $4.00." "Construction is easily ter, at Lake Charles, during the Old providing an ignition engine service, has completed in two to three hours." Timer Events. Although Joe was cough­ Hurleman engines and parts, does Brown "The rudder is quite responsive. ing badly we didn’t think it was serious. Jr. overhauls, parts, and service, and Elevator response is adequate for Just received a note from Carl Bryan writes a few letters in his spare time, to normal flying and can be reduced (another Brainbuster), announcing Joe’s w it: for training purposes.” 'You will death on December 4. Truly a shame, as "This 40th Anniversary Motor pro­ probably never break one." “The Joe wasn’t even retirement age yet. Joe ject has turned out to be a lot more Western Wind is tough." was a good modeler and an even more work than I figured. There are 361 op­ In R/C Sportsman Dr. Larry Fogel ardent competitor. We’re gonna miss erations required on each engine! Can’t commented, "I can testify that this that boy around here! count the hours on each engine, as I am cardboard creation really flies," SATELLITE CITY busy from 9 a.m. to midnight, seven If you are still looking for those .020 days a week. Every engine is a challenge Replica kits put out by Cal Aero, you’d in itself, and I learn as I go . . . with in­ better write to Bob “ Hot S tuff” Hunter, ternal variances and improvements as I as he has taken over the sales of the re­ proceed. I’m three months behind plan­ maining kits. Not too many left! ned schedule but can hold it there. EASY R/C CONVERSION “ Probably the biggest and happiest While we have been talking at length surprise is that each and every engine to about converting glow engines to igni­ date has started like a dream. Using no tion a rather interesting development starter and opening the needle valve a The Western Wind has proved came to light the other day while bench couple of turns, I prime it and in three itself and we’re glad that we can running engines with Tom Bristol and to four flips the engine starts. It’s un­ now devote our efforts to supplying Bob Von Koňsky. believable! Occasionally, there are inter­ flyers with good airplanes. Western Tom had a Spitfire he wanted to try nal problems, but when disassembled Winds are stocked by many with R/C but had no immediate means and cleared, no more trouble. dealers (and distributors) but if not locally available you can order of installing a throttle. So a jury rig was “ I believe I ’ll make 400 engines, as direct from Jef's Friends, Box 511, made up consisting o f a length of nylon orders total 356 now, with many inter­ Brisbane, CA 94005. Send $12.95 tubing to fit over the existing intake of national money transactions pending. plus $1.25 for shipping. California the Spitfire, while in the other end a When all is done, a list o f all will be residents add 6% sales tax ($.85). Perry carburetor was mounted. Despite given, together with the total actually the length o f the tubing (1 to 1-1/2 made. being discontinued for lack of interest. inches long), the engine drew fuel ex­ “ My planned schedule stretches to All kits have been “ proofed” , that is cellently and idled beautifully. July 75 (the author just received his in models have been built directly from Further tests also indicate this is an January, No. 074), and will probably the parts. The kits offer all wing and excellent way of avoiding the close fit end in August or September. At that stab ribs, fully notched, and cut long to engendered by the sloping intake and time, I w ill probably make a few more allow for trailing edge notching techni­ the clearance to the propeller. In this .48 Hurleman engines, and probably 12 que. While gusset joints (such as dihe­ case, the tubing can be lashed to the cy­ to 15 more Twin Hurlemans with the dral, rib, etc) are not furnished, formers linder fins with no apparent damage. So improved crankshaft. Then I will start and outline parts are included along what if it does deteriorate in time . . . my 1977 project.” with the plywood firewalls. These kits the tubing replacement is simple! Try Herb concludes by saying he has had are extremely accurate and cut from one and you will be pleasantly surprised about a dozen letters from distributors Grade AA wood. No junk here! at the simplicity o f installation and ex­ (mostly abroad) wanting to carry his For prices and catalog, write to Gene cellent throttle response gained. products. However, based on the re­ at P & W Model Service, P.O. Box 925, BROWN JR. MOTORS sponse to the 40th Anniversary Brown Monrovia, Calif. 91016. You won't be Since Herb Wahl embarked on pro­ Jr., the magic number for sales seems to sorry! (To further clarify, P & W kits ducing the 40th Anniversary Brown Jr. fall in the 300 to 400 mark. There simp­ do not include strip and sheet stock, motor, many people had the mistaken ly does not seem to be enough for a

66 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER SURVEYS SHOW USERS M A K E "HOT STUFF" BETTER

THEY, DON'T HAVE TO: LOVERSU STAY IN THE BUILDING ROOM ALL NIGHT!! product line. PROTECT YOUR PI IPIJT I ITC It is the columnist’s opinion that in INVESTMENT WITH | LIDM I LII L this case, price has ruled out large sales. “ ‘ SHOWS However, you get what you pay for, and I ACTUAL in this case, there is no substitute for m ------r — · - quality. THE ON BOARD BATTERY MONITOR SCAMPS OLD RULER LIGHT THAT GOES OUT WHEN 1020 Just received the latest contest sched­ MINUTES OF SAFE CHARGE REMAINS ule put out by the SCAMPS. They are • DOES NOT FADE OUT • SNAPS IN fc*' HOLE 4 ·* NICAD 6 .9 5 staging their usual number of contests, AS SHOWN but this year have added a new twist. • DETECTS BAD CELLS • PILOT LIGHT Witt Krah T»p* of Hum Coon 9 .9 5 For 1976, all contests sponsored by • GUARANTEED DELUXE the SCAMPS will have old timer gas events run under the “ old ruler" con­ ! cept. This means any spark engined SEE CANTHE YOU AFFORD LIGHT NOT TO 2 model that meets the 8 ounce per sq. ft., 80 oz. per cu. in. of motor, and meets ADVANCED DEVICES INC. P.0 BOX 152 ROCKVILLE. MD 70850 the L2/100 cross-section rule, can be Æ) SHIPPED VIA 1ST CLASS MAIL D«al«rt Imrittd flown in its appropriate class. Wow! Anyone for pencil bombers? wire) and purchase two nylon nose all, a good field (who doesn’t these With those high pylons, they do make wheel steering arms. The assembly is days?). One thing for sure, Jim is going the cross-section! then slipped on the axle. Secure with a to hit up the Navy again. Maybe we can SKI RIGS ANYONE? wheel collar. Then adjust the steering get some influence from Jack Bolton. Well, if you are still in the snow, the arm to hold the skis at approximately Kloth reminds the columnist that most recent “ Spot Shots,” edited by 10 degrees (positive) to the model. Dayton is the scene of the 1976 AMA Randy Carman, gives the latest scoop on If that doesn’t sound like fun, and Nationals, the Old Timer Champion­ how to very simple convert your old easy at that, the writer is going to eat ships, the Annual MECA Collectogether, timer to snow ski flying. another hat! (Looks as though Howard and the Air Force Museum. Really Howard Carman (hubby) sez here is saw Pete Waters’ article on making skis, makes it worth your time to go as a a way to convert your old timer (or any in our Dec. 1974 issue, wen) spectator! tail dragger) without having to modify FLORIDA FLASHES BEER DRINKERS FOREVER! the model, use pins, belts, hooks, or Hadn’t heard from Jim Kloth since The columinst has been ragged for rubber bands. the Lake Charles Nationals. Small won­ years about his penchant for beer, par­ As can be seen from the sketch, a der, as he reports that he was slapped ticularly on a flying field where the ski mold is made from any type o f wood into a hospital as a result of a heart at­ heat and dust seem to accelerate the block sized 1-1/2 x 2 x 12 inches long. tack. While under care, he did a lot o f need for a libation. We (the beer drink­ Cut apart as shown on a band saw. Using investigating to find out why Florida ers) always knew there was an excellent two pieces of 1/32 plywood, 2 inches O.T. modeling activity is at such an all- reason for indulging but this has now wide by 12 inches long, coat one side o f time low (?). The only bright spot has been proven to be a fact! one piece with five minute epoxy. Now been the advent of Jack Bolton in Pensa­ Next month we w ill feature com­ stick the two pieces together, cover with cola. pressed air tank construction by Bert Saran wrap, and quickly clamp in the Having built a lot of models for KOI, Pond, who utilizes aluminum beer cans mold. You can make the second one Gil Cochrane and Bill Kirby have in­ to make excellent air tanks. These really five minutes later. sisted on doing the retrieving for Jim! work and are actually lighter than the Now, make the upright pieces from Great stuff! On his end o f things, Kloth brass tanks being used now. 1/2 to 5/8 inch plywood. Epoxy to the expects to take over the Florida News­ That’ll teach you skeptics the value skis. The axle hole on the upright can letter and get the word out. He hopes of beer drinking. Haw! · be the same distance from the skis as to pattern it after Brickner’s “ Flight the radius o f the wheels you are re­ Plug." Seasquare . . . . Continued from page 11 placing. If the propeller clearance is not So Florida fans take heart. Jim sez Pin down over the plan (wax paper a problem, you can shorten the distance. there will be elections for new officers first) the bottom leading and trailing- Make two springs, one right and one to plan out future activities. What is edge sheeting. Mark the rib locations on left hand from 1/16 spring steel (music needed are active officers and most of the sheeting and lightly draw lines at

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 67 RADIO CONTROL W A C O S . R . E j MODEL

SPAN: 56^ LENGTH: 45 3 /32 " ENGINE: .40 to .60 SCALE: 1 5 /8 ” = 1 FT.

Its hard to find words to describe the breath­ taking beauty and great flight performance of this graceful and beautiful cabin bi-plane of the “Golden Thirties". If you're an R/C flyer, whether Sport or Scale, then you are bound to fall in love with this magnificient aircraft. Beautifully engineered for ease of assembly and long-lasting ruggedness: the Waco S.R.E. has loads of room for R/C equipment and scale detail, (it can also be built for control line). It's truly a joy to fly and likewise just to look at, whether on the ground or in the air. The kit’s a real dandy Magnificent-Framed or Finished-Flies Like A Dream too . . . top grade-density selected balsa, sanded to micrometer tolerance. Die cut & numbered parts make assembly swift and sure as you follow the detailed step-by-step plans and instructions that cover every phase of construction. Formed Landing Gear, Alum. Engine Mounts, Giant Scale Decals, Linkage Hardware includes Pushrods, Aileron & Elevator Horns, Bellcranks, Clevis, Connectors, etc. . . also Plastic Cowl with molded-in-place dummy engine cylinder, Wheel Pants, and much more . . STERLING MODELS · 3620 G’ ST. PHILA. PA. 19134 If no dealer available, direct orders accepted — with 10% additio'.ai charge for handling and shipping. (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. 50c enclosed □ “Secrets of Model Airplane Building". Including design, construction covering, finishing, flying, adjusting, control systems, etc. 25C e nclo se d. □ "Secrets of Control Line and Carrier Flying". Including preflight, soloing, stunting. Carrier rules and regulations. Carrier flying hints and control line installation instructions 25C enclosed. No checks. Only U.S. money orders or currency accepted. Name ______Address______C ity ______S ta te _____ Z ip ______KIT P1 BUILDS 3 .9 5 S E 5A & FOKKER D-8 ΚΠ P2 BUILDS KIT P3 BUILDS WACO S.R.E. MONOCOUPE & CITABRIA & INTERSTATE CADET K ______RUBBER POWERED FLYING SCALE MODELSOF REAL AIRCRAFT

Peanut Scale models are rubber powered Hying models scaled Irom real aircraft Span is strictly limited to 13 and they may be down indoors or outdoors. Sterling Peanuts are lun to build and lun to fly Designed by experts, they are remark­ ably realistic in appearance and are great dyers All material required is in the kit for models except glue & dope (paint). In addition you need pliers, straight pins, hammer tweezers, single edge razor blade.dat building board. Saran Wrap (or similar)

Balsa and Tissue Frame Photo Reveals Simple-Rugged Construction Construction. Parts printed on fine quality balsa wood, density selected and sanded to RUBBER MOTOR WINDER 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 it built according to plan.

A MUST FOR RUBBER POWER MODELERS Molded of tough virgin Nylon this five to one ratio 2 O R winder Is a must for long flights and competition endurance. Compact and efficient, the Sterling Winder is |ust perfect for models using up to three loops (6 strands) rubber motor. TWEIMTY- CHICKEN HAWK

3 4 / 2 5 ” SECOND ( M t Λ Seen, SucC yet 0 4 9 A IM IM U A L MISTER E TOLEDO

RADIO •15-.23 1-2 Ch. All die cut parts, formed dural gear. Simple Construction. CONTROL Proven Performer $15.95 The Gentle Intro to Multi. All die EXPO- cut. formed gear, aileron material A nother easy-to-b uild kit $ 2 9 .9 5 Special “ΡίακΛ. See your dealer or order direct. SITION P O Bo. 2555. Schonoctody, N. Y. 12109 TOLEDO SPORTS each rib location to help align the ribs while the glue is drying. The fairing at when they are installed. Add the bot­ the aft end of the pylon behind the tom cap strips, center sheeting and low­ tank can be omitted or made as fancy ARENA er main spar. Install the ribs (except the as you desire. Its effect on flight chara- ONE MAIN STREET center ribs each side of the pylon), the teristics will be very little. TOLEDO, OHIO top main spar, rear spar and sub-leading TIP FLOATS edge. The tip floats are built upside down The bottom sheeting is glued to the on your work surface. Pin down the 1/8 curved bottom part of the ribs and the top former, and space the 1/16 mid­ APRIL sub-leading edge with the aid of the cur­ former above it, using 3/4 in. scrap ved pieces you saved (I hope) when you blocks. Cut to length and install the ver­ cut the ribs. Apply glue to the sheeting tical stringers and glue them in place in Ί . 3 4 , 1 9 7 6 under the ribs and sub-leading edge, and the top and mid-formers. When dry, add then slide the curved scrap pieces under the half-former. Dope or epoxy (see di­ FRIDAY- 9 AM TO 6 PM the sheeting at and between each rib rections for hull) the inside of the struc­ SATURDAY- 9 AM TO 6 PM location. This will lift the sheeting ture and one side o f the sheet to be used SUNDAY- 9 AM TO 3:30 PM snugly against the bottom of the ribs. for side covering, the plywood and balsa A t this point, cut the central ribs to ac­ sheet bottom pieces. Apply 3-inch sec­ UNQUESTIONABLY, cept the dihedral braces. Trim the sub­ tion of the side covering about half-way THE WORLD'S leading edge and aft spar flush with the from front-to-back and on sides o f the tops o f the wing ribs and install the floats. Trim the remaining side covering GREATEST RADIO rear sections of the wing ribs including to approximate size and install it. Fin­ CONTROL SHOW! those at the center. Allow this much of ish, trim , and sand the rear bottom, the wing assembly to dry well before it then install the plywood aft-bottom. is unpinned from the work surface. Rough out the balsa fore-bottom block. □ P E N TO Make the dihedral joint by pinning Now finish, trim, and sand the floats all PUBLIC ALL one half o f the wing to your work sur­ over. The fore-bottom block is not face, gluing the dihedral braces in place rounded at its chine edges; leave the THREE DAYS in both halves of the wing and allowing chines square in keeping with the over­ the assembly to dry with a block sup­ all square m otif. porting the end of the wing which is The floats are attached to the wing not pinned down. Make sure the assem­ after the model has been covered. The bly is true at this point; don’t build in floats may be glued permanently to any warps. When dry, add the 1/4 inch the wings or attached with double plywood center section o f the motor sided adhesive material. Double sided pylon, using as a guide a block of scrap tape was used on the original Seasquare balsa cut to the dihedral angle. Add the and it works real well. center ribs and again let things dry. Be­ RUDDER AND STABILIZER fore adding the top sheeting, dope or The remaining frame pieces and dor­ epoxy the inside the wing structure, in­ sal fin are added to the vertical fin, and cluding the inside of the top sheeting. a piece or two o f flat stock pinned to The top sheeting, cap strips, tip block, the frame work to assure that the fin and pylon faces complete the wing as­ dries flat and true. Dope or epoxy the sembly. Don’t forget to taper the trail­ structure and the inside o f the sheeting ing edge o f the rear, top sheeting before material. Add the sheeting with grain it is installed. This is easily done using vertical. Add the doublers and blind PRESENTED BY a razor plane. nuts to the stabilizer saddle and then The motor bearers are attached to glue it to the vertical fin, checking care­ WEAK SIGNALS the pylon by means o f medium-hard fully to see that it is at right angles with R / C C L U B balsa blocks cut as shown on the plan. the vertical fin. When dry, add the tri­ PD BOX 5772 These blocks are hollowed out to fit angular saddle supports and fair them TOLEDO OHIO a round tank, or a flat tank may be used at their leading and trailing edges. 43613 without hollowing. Clamp the motor The rudder and elevator are made bearers and attachment blocks together from medium-soft balsa sheet. The

70 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER * * * The Kraft System* engineering group pioneered fhe concept of digital proportional control and Subaequently created the innovations responsible for the level of R/C performance CONCEPT * * accepted as standard today. It h not Sur prising, there fore, that the π eu> K ra ft line represents Retractable antenna a major ad ranee in the state of the art- f Spin buttons, roll buttons, and Additionally, because the ηβα» crysta.1 filter X.F, receiver Ssl 1ÍT r0k*e 4Uk,'^ t ' ' es a re a v a ila b le does not have to be tuned to its transmitter, complete 1 at extra cost on special order or may be added interchangeability is obtained and component rather than System merchandising is made possible.

To utilise this advantage, Components 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 itc h individually packaged and the purchaser for may select items to custom tailor a. reliability System to his preference.

Some of the features of our Ďiceritennial Series are shoum here.

Triple use meter reads RF and transmitter battery voltage and also automatically converts to read recei ver battery voltage. I t has an electronically expanded scale E a s ily for accu-racy. a ju s ta b le stitk lengths

Totally new tuio-axis open gimba-l stick, assemblies are of the highest quality yet produced. This design eliminates any possibility of· centering error and has excellent feel to satisfy the most demanding flyer.

A new open gimba.1 single stick, version is available a t no extra, cost. KPT-7CS

Plug-in transmitter and K P R - 7C receiver modules provide ______u i instant change betuieen 5 3 .H 0 0 New solid state crystal filter J.F. the (7 standard R/C ■frequencies. receiver makes possible plug-in frequency modules and provides improved selectivity for better rejection of strong adjacent channel interference, dn advanced design dual conversion plug-in receiver is available at extra cost.

Cable interconnects battery test circuity in transmitter to receiver charge jack. Receiver battery is tested ander load. K r a f t J. 9 L SYSTEMS. INC. Contest performance and reliability Λ derate price, (λΛ. superior ment to our world fc Sport Series.

u.g-in conversion to optional trainer switch

requency t ion p lates

buper-precision open

Plu

m odular en cod ers a s w e ll as R.F. s ectio n s to provide stand ardiz-ojtion -for im proved

Suff ici ently modest to permit the customer to tdd a different frequency receiver to his system neater flexibility. The list price -for the plug-in msmitter combined uiitln anew receiver is only4>7

m frequency conversion isdesired u>ith the K.P-5C r may be substituted at a šlicht extra cost. Our new 3 channel system offers greater utility than previous models because of K P T -3C the new control stick conf iguration.

D e s p ite pn e e advantages, troublesome unreliable d dry r batteries have been eliminated and all systems nou> include re charge o-ble transmitter and receiver nickel cadmium packs with charger.

1 h e " tr a n s m itte r h a s p lu g - in R.F. m o d u le s » accessible by removing transm itter back. The le^t-homd 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 Ok.ileron and elevator on the right stick. stick. Vertical axis may be Self-neutrali zing o r positionuble SticK configuration can be easily with fine tooth ratchet. changed by owner.

integrated circuit decoder and servo amplifiers <*.re now standard. All new mechanics are smaller, stronger, and feature the rugged K P S - I 4 I F gear tram . internal reversing plug matches channel" O utput to desired control stick configuratfon.

O ne 550 Γ1ΑΗ battery pack and tw o compact- lightweight vso pi AH battery packs a re optionally avaitable "to suit a. wide Kft-HE range of installation requirements. ί s ------Jj- For high current drain /^X \ application,a 1,000 MAH heavy- Four servo mechanics are optionally duty pack is available available to suit individual at ex tra cost. K β - H Jr preference. All feature o ur exclusive integrated Circuit ,DIRECT SERVO CONTROLLER Servo am plifier for unequaled accuracy, smoothness, and efficiency. Special high t o r q u e . and high speed servos are also KB-4S available at extra cost.

Plugs into charge jack of switch harness permitting operation of throttle and retractable landing gear without interfering with others or being interfered with. { 6-n indispensable accessory fo r Crowaed -Plying fields KPS-I

V/RITE FOR FREE. CATALOG- KPS-/5H 450 WEST CALIFORNIA AVENUE T, _ RAFT RO. BOX 1268-VISTA,CALIFORNIA 92083 K? SYSTEMS, INC. World’s Largest Manufacturer of Proportional R/C Equipment and make the bend going up to the ele­ vator. One-sixteenth music wire can be s a l o m a used inside for the remaining length. WING KIT for This will minimize the effect o f the SALOMA-OX II not at vo.it Ομ Ιπ . cxOiit d*t«ct Sp*o . 99 8 -o. BM. No. K1 check money onlar, UPS C.O.O nylon expanding and contracting. Note A r e ·...... 778*0 in 824.95 P irord orden lh.ppeil by ·■( W®t 47-48 or that the outer nylon tube is epoxied IUPS BLUE LABEL! C*l.f Seen . . . Ι35 5·ο. Vf.no loading 8 or. ft/? A m . 1140 M). m. • ntrflenti *rlU Min t* · where it passes through the hull, but is Wing loodio« . . . . 8 .3 o r ft./? cat. No. S-1 Μ ·*« th· SALOMA left free to expand or contract as it ■ FLOATER $44.95 AkleU . JC-75-1? passes through the bulkheads. (*«*s undvrcamboed) The connection from the rudder ser­ ** W*dr«i 4 Φψττη tn 10 d Send 504 for C4UIO{ of 100 qiail iliim vo to the nose wheel bell crank is made Radio con not inside the hatch. Control tin# Frma lltnhl The connection from the motor ser­ vo to the throttle is make using a wire- inside-nylon-tubing installation. The tube passes out o f the hull in front of the leading edge o f the wing. The throt­ tle end is held by a metal clip near the motor. Use a nylon clevis for the throt­ tle. The clip and clevis must disconnect FOAM TAILFEA THERS ^ " SUPER PERFORMANCE by themselves (break free) in case o f a ASA PLASTIC FUSELAGE * SOARING TRANQUILITY crash where the wing is torn from the ^ SEISERENE IN ITS EXCELLENCE hull. .No <·1Γι«·ι owrvij ikvJcxL-fg,X)ýť'f hul. jm i jy r a A w i » A BIRD OF PURPOSE OPTIONS AND TECHNIQUES »1^1» MX ο» Ilk lit* ItMbtW tH* voliy· o.vwir Every scratch-builder has his own ap­ 'M tn* f 1 i·', i l| l JOHNSON MODEL PRODUCES INC 11015 Qlfinuski Rlvt), Panama Cn 91331 proaches to model building and this is Pi.tti F «1315599 «31? as it should be. The comments that fol­ low should be treated as suggestions. . . WACO ATO · GULFHAWK ΙΑ·0-43Α an effort by the author to pass on infor­ X mation that he has found useful. co 9 ° It is obvious that the simplicity of If) I SCALE ooω -σί the Seasquare lends itself to major var­ CO Ó iations in construction techniques. The foam approach is an obvious variation, < I PLANS to even the hull is a natural for easy cut­ Day: 635-8147 ° byWESTBURG Ó ting. The following specific suggestions A/C (318) Night: 861-2790 • are made: o o £ 30 X 40 DETAILED REPLACEMENT ROTOR BLADES o • BLACKLINE PRINTS GLUE Jet Ranger CNI eo ______Standard model airplane cement, < * SEND S.A.S.E. 5 ° such as Ambroid, Testors, or Aerogloss X-pert . . . S11.50 h* y ao r-. FOR COMPLETE μ i ; may be used. However, if you water­ Regular. . 10.50 x to > r- 2 PRICE LIST • o proof the insides o f your model, white Q ■n · glue (Sig, Wilhold, Sears, Elmers, etc.) C P GULF-SOUTH AERO MODELS 52 O PETER WESTBURG JO 10 or Titebond may be used for general > 834 Seventh St. No. 6 5603 WEST CANAL < construction. The latter cements have SHREVEPORT, LA. 71108 o Santa Monica, Calif. 90403 ideal drying times for most construction work. In any case, if an accident occurs, water rudder and its mounting parts on when it is sitting on the beach. The long drain the water out o f the structure as the air rudder are from 1/16 plywood water rudder is necessary to assure that soon as possible and allow the insides to as shown on the plan. The central horns the model tracks straight when it is dry thoroughly. It may be necessary to are added after covering is completed. planing on its flat hull, if the rudder remove covering material to achieve ad­ Be sure to remove the covering where comes out o f the water at too low a equate air circulation for rapid drying. they are attached and epoxy them di­ speed, Seasquare will wander about un­ rectly to the wood. til it has speed enough for the vertical COVERING The stabilizer is a simple, flat struc­ fin and rudder to take over. The preferred method of covering is ture. Dope or epoxy the structure on As a land plane, it may be necessary with silk or silk/rayon (Silray, Silron, the inside before it is covered. Use plen­ to lengthen the main and nose gears to Rayspan, etc.). Fiberglass and resin ty o f plasticizer in the dope used on the prevent the hull from being damaged on should be applied to the fore bottom stabilizer to avoid over-tightening and rough landing. The length can be ad­ and top center section of the wing (4 warping. The author uses castor oil as a justed to the builder’s own taste. inches each side). plasticizer. Four drops to the ounce is Don’t forget to plug the nose gear Paper (light Silkspan) may be used in normal; six to eight drops per ounce hole and put screws into the blind nuts place o f silk on the hull sides and top, can be used in this case. If too much used to secure the main gear when you the rudder and the motor pylon. plasticizer is used, drying w ill be very are flying from water! Iron-on covering is not generally re­ slow; it ’s best to check a sample for CONTROL INSTALLATION commended for seaplanes unless special drying properties before you dope a sur­ Control equipment is installed in the sealing techniques and care are used to face on the model. waterproof hatch. More than enough assure water tightness. If water enters LANDING GEAR room exists for even the largest pro­ through a seam, it will soak into the As a seaplane, the hull and tip floats portional servos, receiver and batteries. structure and cause the model to be­ function conventionally. Planing blocks The control rod installation for the rud­ come unbalanced. Water that enters in were added at the step to provide mini­ der and elevator are detailed on the this manner is very slow to dry out, and mum water contact at the moment be­ plan. Use nylon tube inside nylon tube permanent weakening of the structure fore take-off. They also protect the hull where the rods pass through the hull, may result. 74 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER DRILLING HOLES Holes in balsa and plywood may be drilled using thin wall brass tubing with AftC ing... NEW SPRING ACTIO N outside diameter equal to the hole size. File saw teeth on the edges and rotate back and forth as you push the tubing through the wood. Back the piece of KWIK- KLIPS wood being cut with another piece of It's finally here!!! A battery wood to assure clean break-through clip that won't ever slip Larger tubing sizes (1/4 and up) can be sharpened on the inside before the or vibrate off! teeth are filed. The teeth can be quite irregular without apparent loss of cut­ Spring action locks the Kwik-Klip onto the ting ability. glo-plug for continous positive contact. SCREW-TYPE HOLD DOWNS 'Indestructable steel and nylon parts. Stabs and hatches are attached using screws. It is necessary to use large 'Available with or without battery wires. washers upon the screw heads to distri­ 'The best yet in engine starting accessories. bute the pressure and not mash down, No. 1 50 (without battery wires) .700 the balsa under the screw head. An even No. 1 51 (with battery wires) $1.25 better technique is to cut short pieces of dowel, equal in length to the thick­ Patent P ending ness o f the surface being held down (for 4-40 screws use 1/4 or 3/8 dowel. For 6-32 use 3/8 or 1/2 dowel. For larger screws increase the dowel diameter ap­ propriately.). Drill a hole through the surface to be held down the diameter of 1/2 A KWIK· KLIPS the dowel and glue the dowel into this For engines .020 to .074. hole. The screw hole is now drilled No. 149 (with battery wires) S1.15 through the dowel which, takes the No. 148 (without battery wires) .650 place o f the washer and distributes the Shown actual size on an .049 force evenly to the surface being held down. · 'DU-BRO PRODUCTS INCORPORATED Choppers...... Continued from page 25 480 Bonner Road Wauconda. Illinois 60084 U S.A. one, with opening doors, floor carpets and flocked side panels. The red, white almost commonplace, and reports of such as climbing turns and diving turns. and blue bi-centennial paint scheme was slow-rolls and even Cuban eights being For example, practice a climbing left something to see. A close examination performed regularly, my curiosity finally turn and rolling out into a diving right of the doors show that ball-links make got the better o f me and I decided to do turn. One o f the best practice maneuvers perfect hinges, especially when the door a little research on the subject; to is the chandelle, which is performed by opens on an angle. Naturally, they can discover the secrets of helicopter aero­ executing a shallow dive, followed by a be completely removed by "snapping” batics. Although the findings are not steep climbing turn, and rolling out them off, and the accessability to the really super-secret, nor are they partic­ 180° from your entry direction. Next interior is fantastic. ularly difficult to do. Like everything on the practice list are wing-overs and * * * else, it requires a good basic knowledge lazy-eights. The wing-over naturally Over the holidays, I was honored of maneuvers, lots o f practice with the leads directly into the hammerhead (or with a visit from Fritz Bosch, General simple patterns, and a gradual work-up stall) turn maneuver and is probably Manager of Simprop Electronic, Harse- to the more difficult looping and rolling the best way to get a feel for how the winkel, Germany. Simprop, as you maneuvers. Most of the R/C helicopter ‘copter will perform in a loop, since might know, is the manufacturer of aerobatic data which follows, resulted steep climbs, turns and steep dives are some of the world’s finest R/C equip­ from conversations with the top heli- involved. Rather than describe the ment, as well as kits and other R/C pilots Ernie Huber, Mike Bosch, and game-rules, it is better that you dig out related accessories. If the name sounds Kavan’s test pilot, Herr Heid. Each one your magazines and read about the vaguely familiar, Fritz is Mike Bosch’s does the maneuvers a little differently, performance of the maneuvers and father . . . and any helicopter nut but the basic techniques are similar. visualize them in a helicopter instead knows who Mike is! A few years back, To begin, all aerobatic maneuvers o f an airplane. The techniques are Fritz was the top European pattern consist o f combining 5 basic regimes of almost the same! flyer, and he is still pretty sharp with a flight, (1) climbs, (2) dives, (3) loops, Now, before we get to the loops and helicopter too! During his stay, we (4) rolls, and (5) turns. High speed stall rolls, let’s talk about your chopper and managed to work in a day in old configurations are utilized in airplanes, how it might be bettered for aero­ Mexico (sampling Margaretas), another but never in helicopters! Since helicopter batics. Make no mistake about it, your day flying R/C airplanes and helicopters, aerobatics are almost identical to air­ chopper should have a fast, positive and even managed an afternoon at plane aerobatics, it would be wise to response to your control inputs. Gener­ Torrey Pines, where a lot of hang-gliding brush up on your airplane before trying ally speaking, a stable chopper will not was taking place over the cliffs. Of something new in your ‘copter. Start react fast enough for aerobatics, and course, we took along my Kurwi sail­ by practicing climbs and dives only, must be modified. Conversely, the plane and indulged in some leisurely until you get the feel of the machine, aerobatic chopper will not be the most soaring. What a nice way to spend the then try steep turns left and right. stable, nor easiest to fly. A good holidays! After you have achieved a good level compromise must be worked out to your HELICOPTER AEROBATICS of comfort with the above basics, you ultimate satisfaction. With R/C helicopter loops becoming should start combining the elements, Since the Kavan )et Ranger is used

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 75 it most convenient to work from right to left when performing loops. Enter STRIPING TAPES the loop from a shallow descent, at SUPER STRIPE GLIDER STRIPE something less than high-speed flight. Excessive speed may cause uncontrolled THIS NEW ULTRA THIN TAPE HAS THIS TAPE WAS DESIGNED FOR pitching, and is not really required for FANTASTIC CONTOURABILITY AND NON FUEL PROOF APPLICATION. WILLCURE ON YOUR FINISH FOR A IT HAS GREAT CONTOURABI LITY the maneuver. The correct entry speed FUEL RESISTANT ACCENT OR TRIM AND ADHESION AT LOW COST. can be determined by doing steep wing- BOTH TAPES COME IN: RED «WHITE «BLUE «ORANGE »YELLOW OR BLACK. overs or lazy-eights until you get the feel o f control response, t-hen simply SIZES 1 /1 6 " 3 /3 2 " 1 /8 " 1 /4 " 1 /1 6 " 3 /3 2 " 1 /8 " 1 /4 " PRICES straighten it out and enter your first PER 1 0 8 " .69 .89 .99 $1.09 I 1 0 8 " .49 .59 .69 .89 loop. Pull back very softly with your ROLL 30 ' S1.49 1.59 1.99 2.79 I 3 6 ' .99 1.19 1.49 1.89 elevator to about 3/4 rear cyclic (stick) and plan on a 25 foot diameter loop. Trim RON'S RON'S VÅEÄG0LE sheet compensator Power/pitch should be about 75 to 85% For (not full-power) and should be main­ Beautiful wildly colored any size tained until the chopper is completely designs and letters. glider. I0W HOOK inverted and starts to slide downhill on Pressure V irtu a lly C om plete the backside o f the loop. A t about sensitive^ unbreakable. adhesive Polyester hardware 220° (on the downhill inverted), you backed. m ounted will hear the engine rpm automatically variegated go much higher because the blades are gold leaf. unloading. This high rpm is undesirable $1.89 ea. because it produces blade tip stall, and 5 "x 15" $1.99 ea. resultant loss of control. As the rpm If not available at your dealer, send check Distributor/Dealer A ll items postage paid. or money order to: J.L. Wittman Co., goes up, you should reduce power/pitch inquiries invited. Calif, res. add 6% tax. P.O. Box 2857, Laguna Hills, Ca. 92653 accordingly to maintain a constant rpm . . . power will probably end up at approximately half-throttle for the rest of the maneuver, until the chopper ^ A N T IC A f UNTYPE. FLYING MACHINE. resumes level flight. When the chopper is at the 270° position, straight down, it Aircraft Materials may be necessary to slightly increase back pressure (softly again) to round For the finest quality wood products o ff the return to level flight. The model available. SPRUCE - PLYWOOD - may tend to climb into another loop BALSA WOOD - FAA AIRCRAFT immediately, so be alert to apply forward SPRUCE (up to 60” lengths). cyclic to prevent this from happening. 1/64" Birch plywood. PREMIUM Incidentally, Ernie feels that a movable grade balsa wood. Send S.A.S.E. for elevator (stabilizer) does more harm than • LEARNING HOW TO FLY? a free catalog and order form to: « NEED TIME TO THINK? good, and Mike says it provides better TBYTHE A N T IC . IT ALLOWS YOU TO DO B O TH AT Superior Aircraft Materials control, so you will have to make up THE SAME TIME A T R A IN E R THAT IS TRULY DOCILE. P.O. Box 8082 your own mind on that one. Perhaps Fot additional information, brochure and catalogue tend 0.50* TO·- PROCTOR ENTERPRISES INC. Long Beach, Ca. 90808 an adjustable elevator is the answer, so P.O. BOX 9641 you can experiment with which is best SAN DIEGO. CA. 92109 for more info, call (213) 421-3935 MFGO. AT 6821 CONVOY C T . SAN DICGO CA. for you. Monday to Friday, 9 A.M. to 9 P.M. The Jet Ranger will roll almost iden­ tically to an R/C airplane, up to the by all three o f our acro-experts, we’ll The main rotor head should be as rigid inverted position. Then it has a definite confine our discussions to that chopper. as possible on the shaft. Wrap the head tendency to rotate about its vertical (1) The Jet Ranger should weigh in with electrician’s vinyl tape so as to axis. The best way to roll, is to enter at 12 to 13 lbs. for best performance, stiffen up the oval rubber damper as the maneuver in the same fashion as a and a powerful engine is a must! Recom­ much as possible. loop and begin a barrel roll, just as the mended were U.S. Max Schneurle, Webra (3) Use the new “ wood” stabilizer nose is above the horizon about 20 Speed, Webra Blackhead, and Super paddles to match the expert rotor blades. degrees. If you haven’t the stomach for Tigre Bluehead (in that order). (4) All control linkages from servos this, try a half-roll to inverted, then (2) Use the "expert” main rotor should be located in outside holes for pull back softly and complete a smooth blades with .one large lead-ball weight maximum throw. Main rotor blade “ split-s” maneuver. Ernie says this is a in the tip o f each blade. The hardwood pitch should be reduced slightly below snap and provides practice for both leading edge should be firm ly bonded to standard settings to obtain higher rotor rolls and loops! Just fly it like an the balsa trailing edge at the root-end speed. About 1-1/2 to 2 turns less on airplane and you shouldn’t get into by wrapping a 4" wide layer of fiber­ the blade pitch control links should trouble. Once you are proficient with glass and resin around the blade prior produce a desirable 5100 rpm on the Split-S maneuvers, you can enter them to cementing on the hardwood rein­ tail rotor. consecutively in a Cuban Eight series. forcement plates. After installing blades (5) The helicopter should be balanced There you have it for this month. in the blade holders, set the adjustment to a slight nose heavy attitude. Add Go out and practice, but don’t write me screws (against the blade tongues) so weight or shift components as necessary. your sad letters if you bust up that that each blade has a slight lag in the For your first loops, start at no less beautiful bird because of this article on direction of rotation. To accomplish than 100 feet of altitude to allow for aerobatics. I repeat, you must be an this correctly, set the alignment “ string” errors, and preferably work cross-wind excellent pilot before attempting these in tip notches, cut 1/4 inch or 7 mm in a light breeze, so that headwind/ unusual positions, and only you can back from the leading edge rather than tailwind components will not affect determine when you’re ready to do some at 17 mm as mentioned in the plans. your speed judgment. Many pilots find acro-flying! BCNU next issue. ·

76 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER " h o t s t u f f : GETS IT TOGETHER

PER U N IT (Two large bottles) FAST THANKS TO TREMENDOUS AT YOUR HOBBY DEALERS NOW WORLDWIDE MODELER ACCEPTANCE DEALERS AND DISTRIBUTORS SATELLITE CITY, P.O. BOX 1935 CALL (213) 899-2301 ARLETA, CALIF. 91331 EK togictrol RELIABILITY IS WHY R /C SCALE CHAMPIONS USE EK LOGICTROL RADIO SYSTEMS For our full line brochure, write EK-logictrol, Dept. SRM.3322 Stovall St., Irving, Tex. 75061. Distributors, jobbers and dealers contact us for our new plan. Reliable radio control systems

F lip ...... Continued from page 35 large solder. Gas tank is mounted with The balanced rudder is controlled by rubber bands; we put a small piece of a second servo through a conventional than 1/16 or 3/32, and the weight is foam rubber between the tank and the push-rod and an aircraft nose-wheel tiller not a problem. Fuselage is 1/4 inch fuselage. mounted on the rudder shaft. We chose balsa, typical profile construction, with Everyone has his own finishing tech­ to use the aileron/elevator stick o f the 1/32 inch plywood nose doublers over nique; a quick method for us is to apply Mode II MRC Mark V transmitter for hardwood motor mounts. The whole four coats of clear dope, sanding well controlling the rudder and sail, permit­ thing can be built from one piece of between each coat; spray on one or two ting one-hand operation o f the boat. 1/8 X 6 X 36 and one half of a piece of coats of color, trim , and top o ff with All-in-all, the ProBar Trident is an 1/4 X 3 X 36 balsa. No, don’t ask the two coats o f clear. We feel an epoxy easy boat to build and an easy boat to hobby shop for an 18 inch piece of 1/4 finish would also be most desirable. sail . . . and sail reasonably well. Just balsa; buy the whole piece and build For flying, it ’s fast and lively. Ad­ one warning for those of you who race two models. just elevator throw to suit your taste; it a trimaran for the first time, after having There’s our rationale and sales pitch doesn't take much. some experience with a monohull . . . for the Flip; now we can get into some We understand our MODEL Watch yourself rounding those marker construction comments. As mentioned, BUILDER editor has never flown con­ buoys. That 36 inch beam will fool ya we need only 1/8 and 1/4 inch balsa trol line (well, almost never, wnc) as he every time! * plus some scraps o f 1/8 and 1/32 inch is the editor of a full coverage publica­ plywood. Six inch wood doesn’t have to tion, we think the C/L fliers in his area be used for the wing; 3 inch planks can R/C Cars...... Continued from page 57 should get him out to the circles. You be edge-glued to get the necessary modified HRE car with rear suspension. owe it to your readers, Mr. N.! · width. Make up the fuselage, epoxying As you can see, it ’s a solid rear axle ar­ the 1/4 inch hardwood motor mounts rangement, the simple “ live axle” con­ in place with the correct spacing for the Trim aran...... Continued from page 55 cept, with cog belt/pulley drive, upper engine being used. We assemble the en­ Operated with a pair o f lim it switches, leaf spring trailing arms on each side, tire plane using five-minute epoxy for all the device can be powered by the lower trailing arms which go from the joints. Cloth or sewn hinges can be receiver/servo pack or by a separate lower outside o f the bearing blocks for­ used; be sure they are free. Any com­ 4.8 volt airborne pack. The output arm ward to the center of the car, and dam­ mercial bellcrank is fine. We use an R/C- travels approximately 180 degrees in pers to the outside rear of each bearing type horn on the elevator as very little 5 seconds, and the 2 by 2 by 5 inch unit block. The lower arm, which goes for­ throw is needed; also prefer a 1/16 inch weighs only 8 ounces. The switching ward and to the center, provides side­ pushrod to insure no flexing. Lead-outs mechanism is operated by a push-pull ways stability like a Panhard rod, as are thin wire or flexible cable. Engine is rod from the radio sail servo, and over­ well as the lower pivot or flexing mem­ installed with two washers under the load is handled by two coil springs and ber. Individual spring leafs could be front holes of the mounting lugs, for two wheel collars, for simple installation added or taken out to change spring thrust offset. Tip weight is a length of and easy adjustment. rate, and roll rate changed accordingly, MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 77 Gto-OBVIL ChallengerU PLUG $5.00 FACTORY REBATE AVAILABLE,

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suspensions were similar to actual auto­ I CLOUDBUSTER RACE WINGS I motive suspensions, having an in-line BETTER engine with the power going through a right angle transfer case to half axles, THAN A with universal joints on each end, and the rear axle hub carriers on two A- THIRD frames. Both were complicated, with many parts, and very delicate. With nor­ HAND! mal driving, they would come apart, much less any shunts or bumps by RUBBER SCALE PLANS FOR SIX (6) other cars in competition. The Futaba FLIGHT-PROVEN, RARE & UNUSUAL Dune Buggy rear suspension seems to be RACING PLANES: CROSBY, FLOYD reasonably rugged, but the layout not BEAN, TWO FOLKERTS, SMIRNOFF BEARCAT, and CHAMBERMAID. too good. In the Futaba, the engine is in Complete set, postpaid, only S4.00 Available through your dealer. line with the power drive going back to Write for a free catalog. a gear box, then out, going forward un­ order from: * Dept._ . 21„ . R_ CLOUDBUSTER VENTURE der the input through a U-joint to a 90° 10107 Adella Ave., South Gate, CA 90280 P.O. Box 2921, Livonia, Mich. 48154 drive and a solid rear axle. The axle is sprung at the sides. The U-joint and as there was no separate roll rate con­ has the complete engine and drive train axial drive allow essentially vertical axle trol. The car worked quite well, but I unit suspended on two upper solid trail­ motion as well as roll. But because of had to have the dampers (just friction) ing arms, with ball joints at each end, a the layout the c.g. is very high. or the car bounced too much. Since I metal flexure element at the front bot­ So we don’t have very much for a used one belt for the power drive, it had tom, a rubber shock mount in the front good competition suspension system. to be relatively tight, or it would jump center, and a stabilizer bar on the bot­ But I know there are several people out teeth on the pulley during acceleration, tom. The metal flexure element is about there still working on the problem. In so there was a noticeable increase in 1/32 in. thick and 1 in. wide at its nar­ my own case, I have decided that to get bearing friction. As I would expect now, rowest point. The flexure element and the most out o f rear suspension, there the car had quite a bit o f high speed rubber shock mount allow vertical and must also be front suspension, so the understeer, even when I had a reason­ torsional motion o f the power pod. The problem is a little worse than I origin­ able high spring and roll rate at the stabilizer bar active arm length can be ally thought. Also, because of my ex­ rear. The car was quite easy to drive and changed to adjust roll rate. I didn’t perience with the cogged belt drive, my you could really get back on the power check the vertical spring rate, but I last suspension car used a chain drive. very early in cornering and really be imagine it is relatively high because of The results were encouraging, and my going coming out o f the corners. The the flexure element motion (both ends next suspension car will be chain driven rear suspension worked quite well, but clamped), and the rubber shock mount also. The chain does not have to be over­ it just wasn’t strong enough. After a being so parallel. The set-up is very stur­ ly tight to function properly and there couple of blasts in the rear during the dy and looked in great shape after all is very little friction loss and no pro­ Nats Road Main, all the flexing mem­ the racing was over. The one drawback blems with slipping. bers were collapsed. A good rear bumper on Longshaw’s car is that the sprung Flave you wondered why I’ve been would have helped, but a good hit on weight (the whole power pod) is high, writing this series of articles on suspen­ one of the rear wheels would probably so that the suspension performance can­ sion? Well, its primarily because I have do the same thing. not be optimum. One thing on Ted’s been trying for some time to come up A t the 1975 ROAR Nats in Massa­ car that is different is the dual lexan with a good suspension system myself chusetts, Ted Longshaw, o f England, plate chassis, which is quite stiff. Sus­ and haven’t been able to do it. The task had a rear suspension car. There was a pension cars may require a rather stiff is much more difficult than it first ap­ picture o f Ted’s car in the first article chassis to keep the motions in the sus­ pears. By writing this article series on on suspension, and there is another pic­ pension components where they can be suspension I’ve had to review what I ’ve ture (or two) showing Longshaw’s rear controlled better. seen and understand about suspension suspension set up here. Longshaw’s car The old Dynamic and Racar rear and put it in a semi-logical sequence and

78 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER MEW! PLASTIC SCALE GOLDEN AGE ENGINE PRATT & WHITNEY "WASP” Molded in two colors o f plastic, this model consists of more than 200 parts. Included are: nine cylinders, crank­ case, carburetor, car­ buretor stack, two magnetos, fuel pump, oil pump, starter, MARTIN B-10B 1/72 sc a le p la s t ic sca le m o d e l k it propeller hub, vinyl ignition harness, and display mount. The MARTIN B-10B was a forerunner of advanced WWII bombers, Suitable for exhibit by itself, or installation in a scale and spanned the 1934-1942 era. B-lOs were used by the U. S., Holland, Russia, China, Siam, Turkey, and Argentina. This aircraft fea­ model aircraft. iy,"=l' SCALE Price: $11.95 tured such refinements as fully enclosed crew, retractable landing gear, ALSO AVAILABLE: WRIGHT J-5 •‘WHIRLWIND” 1’/,'' SCALE KIT AND controllable pitch propellers, and revolving gun turret. Kit features: LE RHONE ROTARY 1 ond l " SCALE KITS Landing gear may be installed in your choice of positions. · Choice of hard or flexible tires · External bomb rack and bomb · Micro Scale decals with choice of markings · Plastic display stand Price: $4.95

BOEING 247 i/72 sca le p la s t ic scale m o d e l k it Forerunner of today's transports, the BOEING 247 incorporated such advanced features as all-metal construction, retractable landing gear, de­ icers, and controllable pitch propellers. Model may be finished as Roscoe Turner's racer or a United airliner. Kit features: Two types of wind­ shields · Landing gear may be installed in your choise of posi­ tions · Choice of hard or flexible tires * Decals by Micro Scale (racer and transport markings) · Passenger seats · Turner's long- range fuel tanks · Plastic display stand Price: $4.95 FROM YOUR DEALER OR ORDER DIRECT, ADDING 15% POSTAGE AND HANDLING SEND 25c FOR COMPLETE CATALOG ^ W I u JAMS DEPT. MB · 181 PAWNEE STREET X SAN MARCOS, CALIFORNIA · 920Ó9

explain why some things work and Zero, Bat Baboon, Mauboussin, Piper area into various other rooms in the others don’t. In this way I have been Cub, Druine Turbulent, Supermarine house, yet his wife seemed unusually seeing what seems to be important, as Sparrow, Farman 231, Huntington, Hi- tolerant of this! well as how much. With this understand­ rondelle, and a Stalwerk. A surprisingly It was also reunion time for me, as ing, maybe I can now go back and de­ large percentage o f entries were con­ Eric brought out the little Farman sign a competition suspension system structed from Model Builder plans, pro­ Moustique Peanut, which he has been that might work. When I have something ving that our centerfolds are being put proxy-flying for me in the Cardington reasonably good, you’ll be the first to to good use ... internationally. Airship hangar contests. hear about it. · HANNAN’S HANGAR OVERSEAS We broke away from our model air­ As promised, we intend to share craft discussions long enough to enjoy a Playboy...... Continued from page 39 some o f the pleasures o f our recent trip truly exceptional meal served by Pat a .29/.35 engine combination, fully pres­ with our readers. We had the rare oppor­ Coates, topped o ff with raspberries and surized, that will give you a potent tunity of visiting with many model ice cream. Then, back to the workshop machine in both Class B and C. Full builders, authors, historians and all- to see more models! Eric takes his scale­ access to the cowled engine area should around enthusiasts, and returned home modeling seriously, and prefers his de­ be maintained for easy intercharge of secure in the knowledge that we are tailing “ in the round” rather than gra­ motors. Now, you have the dope, get truly fortunate to be members o f the phically applied, and backs up every yourself a real competition machine, aviation fraternity. item with comprehensive proof-of-scale and see how good you are at picking A VISIT WITH ERIC COATES presentations. thermals... · Vour author and J.D. Gillies had the As an example of his dedication, his pleasure o f meeting Eric Coates, who latest project, a WW I Martinside “ Ele­ Hannan...... Continued from page 45 edits the flying scale model column of phant” R/C model, consumed some 1. M. Jeansoulin Mister Mulligan the English “ Aeromodeller” magazine. 4,000 man hours. His journalistic efforts 2. J. Pouliquen BD 6 He and his wife, Pat, reside in a home have contributed a great deal to the re­ 3. M. Xamena Monocoupe with a name, “ AROSA” , rather than a surgence o f flying scale activities in all Note that Walt Mooney’s proxy Peanut number, an idea which seems to be very classes, and we can wholeheartedly re­ is still placing well, having already won human, unlike the coldly impersonal commend reading his Aeromodeller col­ several prizes in past contests. The turn­ numbering system. umn. out for the Peanut class resulted in 35 Eric showed us to his well-equipped OUR NEXT STOP... qualifiers, compared to only 3 in the workshop, located in an upstairs room. was at the home o f P.T. “ Pete” Capon, Maquette class. The variety was out­ Eric's aeromodeling interests are well- Pete is an autogiro expert, having spent standing, and included, in addition to balanced, and include everything from a number of years working with ‘giro’ in­ the models already mentioned: Evans Peanuts and C02 types clear through ventor Juan de la Cierva. Additionally, VP 2, R.E.P., Cougars, Hawker Fury, large R/C models. . . all scale, of course. he served as a designer with several Eng­ Wittman (type not specified), Mustang, His models overflowed from the work lish aircraft firms, including Superma-

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 79 QUALITY PRODUCTS Β κ 5

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rine. Among other tasks, he was respon­ the workshop. Here was found a more- prior to crossing the Channel: “ Which sible for the tailplane configuration of or-less typical model-builder’s hangout: way is England!” This really "broke us the record-breaking S6-B floatplane ra­ Piles o f magazines and plans; parts of up” , and added to the delightful absur­ cer. Now retired, he devotes much of uncompleted models . . . the usual. But dity o f an Englishman, an English lad, a his spare time to aviation historical not the models . . . they were anything Scotsman and a Californian, out in the activities, drawing upon his extensive BUT usual! The latest project was a middle of a cowfield in the dark, flying archives of photographs and first-hand Cox .010 powered semi-ducted fan craft a “ toy aeroplane". All we lacked was a recollections. Like so many enthusiasts, with a fascinating original configuration. mad dog. And yet, we couldn’t have Pete has a strong background in model We were struck by the comparison of been happier, and the model flew ex­ building, and over the years has partici­ Ray’s work with that of Walt Mooney cellently. Had a constable happened by, pated in virtually all facets of the hob­ . . . both are well-known for their en­ he probably would have arrested the lot by, including display models, Wake­ thusiasm and clever model designs. o f us for drunkedness . . . yet we were fields, gassies, and gliders. One of our Ray Malmström has been conduct­ stone sober. photos depicts a display of tiny models ing model clubs for nearly 30 years, Regretfully, since the cows were up­ constructed entirely from matchsticks. passing his knowledge and zeal onto set by our presence, not to mention the The fuselages, for example, were carved countless youngsters, and has also au­ fact that the aircraft was scarcely visible from laminated blocks o f the match- thored many magazine articles and when airborne, we left this magic spot, wood. All insignia has been hand- books on the subject. deeply aware that we had participated painted, as has the minute lettering of Ray suggested a quick trip to the in an enchanting experience. · the title and individual captions! local flying field to demonstrate a new Betty Capon staunchly supports her pusher-puller model, so Ray, Doug, Soaring...... Continued from page 37 husband’s interests, and is outspokenly Ray’s grandson, and yours truly piled in favor of such activities. In addition, into the family Mini car, and headed in­ her culinary art is simply out-of-this- to the dusk. After a time, we reached world! the site, which turned out to be a pas­ THE RAY MALMSTRÖM ture, complete with cows, not to men­ EXPERIENCE tion their “ used hay” calling cards. By This exhuberant, warm-hearted gen­ now, it was almost totally dark, but tleman was waiting for us in front of what the heck, _we came to fly model (2 .6 9 ) X (.2 1 ) X (.873) x (.982) x (2.25) x his home near Cambridge University, aeroplanes. (.8 9 ) X Ί.04) = 1.01 where he is an Art Professor. Ray’s With the aid of a large hand-drill, home, like Eric Coates, has a name, Ray wound the rubber to the accom- "Since the value is greater than 1.0 "Haslingfield”, rather than a number. panyment o f encouraging words from . . . (by a hair) . . . the new spar system After the introduction to Ray’s family, his small “ gallery” . As he prepared to should be at least as safe in the new and tasty refreshments served by the launch the contrivance, he paraphrased design as the old one was in the old charming Mrs. Malmström, we retired to Louis Bleriot’s classic remark, uttered application.” ·

80 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER Sailing...... Continued from page 28 able reading. They all touch on all of the major areas o f our interest, and all " N E W S FLASH make a strong plea that sailing is a sport that we engage in for fun . . . fun . . . FUN. McDERMOTT spends half of his vol­ HP WINS AGAIN ume talking about specific sailing tech­ niques on each leg of the course. His dis­ Dave Platt first to fly cussion can be taken word for word and applied to your boat. a R/C Ducted Fan Aircraft SHIELDS is more conversational, but in R/C Scale at the NATS I learn from him without feeling that I am studying. with th e ...... HP40R KNAPP steers a middle course be­ tween these two, and gets into some specific discussions of equipment pre­ sently available for modern racing boats. Any one o f these three is worth its price. They are all trying to sing the same song, but with slightly different emphasis. Well, there you are. Not an exhaus­ tive list o f my holdings, but a culling o f the ones that I ’ve found most helpful. R/C yachtsmen must share with their full-sized counterparts a requirement for resourcefulness. Just because a printed page addressed to your problem of the moment does not fall into your hand is no reason to give up. Get out and dig, you might be surprised what is leaning up on the shelves at the local library. I’m indebted to Roger Bard for the photographs of the Paris, III. 50/800 re­ gatta that accompany this article. No specific comments on the photos ex­ cept to say that I think they convey the relaxing time that awaits anyone who goes "to Paris for the weekend.” Thanks again Roger. Remember to send your $5.00 Dave says: “ I have no doubt that ducted fans are the coming AMYA dues to the Secretary, 3917 Sunnyside Ave., Brookfield, III. 60513. thing and the HP 40R will be a favorite choice for high power, And while you have your checkbook easy starting, good idle and amazing durability: even an out, make sure you take out a bi­ occasional lean run doesn't bother it. I'm impressed!" centennial year subscription to MODEL BUILDER. Send questions directly to MODEL BUILDER or to me at: Rod AVAILABLE AT YOUR FAVORITE DEALER Carr, 7608 Gresham St., Springfield, Va 22151. /v) MSOIU MOOfl PRODUBTS BIBLIOGRAPHY V — A f 6929 WEST 59TH STREET · CHICAGO. ILLINOIS 60633 · (312)586-7101 BROWN, Alan, IN VITATIO N TO SAILBOAT RACING, Simon and Schu­ ster, (1972) Lib. Cong. No.-70-154095 HALL, Major, COMPETITIVE SAIL­ KINNEY, Francis, SKENE'S ELE­ CHAPELLE, Howard I., YACHT DE­ ING, REFLEX AND DECISION, Ameri­ MENTS OF YACHT DESIGN, Dodd, SIGNING AND PLANNING, W.W. Nor­ can Design Industries, Box M, Rochelle Mead and Co., (1962) Lib. Cong. No.- ton and Co. (1936) copyright renewed Park, N.Y. 07662 (1974) 62-16304 1964. HENRY, Robertand Captain Richard MARCHAJ, C.A., SAILING THEO­ CURRY, Dr. Manfred, YACHT RAC­ M ILLER, USN, SAILING YACHT DE­ RY AND PRACTICE, Dodd, Mead and ING, THE AERODYNAMICS OF SIGN, Cornell Maritime Press, Inc. Co., (1964) Lib. Cong. No.-64-13694 SAILS AND RACING TACTICS, (1965) McDERMOTT, Thomas, MANUAL Charles Scribner’s Sons (1948) HOW ARD-W ILLIAMS, Jeremy, OF SAILBOAT RACING, The Macmil­ EL VST ROM, Paul, EXPERT DING­ SAILS, John de Graff, Inc., (1971) lan Co., (1964) Lib. Cong. No.-63- HY AND KEELBOAT RACING, Quad­ HOW ARD-W ILLIAMS, Jeremy, 16113 rangle Books, (1967) Lib. Cong. No.- RACING DINGHY SAILS, Quadrangle OAKELEY, John, WINNING, Quad­ 67-25632 Books, Inc. (1971) Lib. Cong. No.-74- rangle Books, (1971) Lib. Cong. No.-70- FLETCHER, Mike and Bob ROSS, 143578 143577 TUNING A RACING YACHT, W.W. KNAPP, Arthur Jr., RACE YOUR PINAUD, Yves-Louis, SAILING Norton and Co., (1974) American Edi­ BOA T RIGHT, Grosset & Dunlap, FROM START TO FINISH, Ad lard tion. (1973) Lib. Cong. No.-73-6898 Coles Ltd., (1975)

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 81 I will now proceed to tell you how. ALL NEW NEWLY MANUFACTURED Build an Orca. But first, a few hundred REMCO 29 IGNITION 1/4 X 32 SPARK PLUGS words on the stuff it uses. These come Now you can once again run first because they affect construction. PRICE S42.50 ENGINE your old ignition engines and ENGINES (engine only) join the Old Timer movement. There are no less than nine engines Plus $1.25 $2.50 each, for postage plus 50^ postage. to choose from , ranging in price and and insurance. availability from great to miserable (The Ignition coils, $6.00 new Cox .75, due to be released at any $51.00 plus 50d postage. moment, makes it ten. wen). The Rossi Complete · has been boss since it appeared and is with ignition ( package (coil, ^ Spark plug (not a "reject") my first choice (as of the moment) for condenser, plug, tie tack or lapel pin. A neat performance and handling. I quite often high tension lead). way to carry a "spare" ! hand-start it, and it never acts up. Avail­ Plus $1.25 for postage $5.00 plus 50 cents ability is improving, thank goodness. If postage and handling. and insurance. you can’t go the $75 for a Rossi, look at the Kosmic and the Taipan. Both are REMCO MFG. CO., P.O. Box 22414, Denver, Colorado 80222 less expensive, easier to find, and both are good enough to win. They’ll turn over 22 grand stock. A new entry is HGK but I haven’t seen one run yet. Engines FOR THAT PROFESSIONAL LOOK. in the works are the OPS, the new KB, Cox, and the STX. Two mills readily 4 r available but not competitive in stock form are the ST and KBS. However, 'BALLAST-LOK" you can send them to Ron Sheldon $2.49 (the Pylon guy) and have him give them "HOOKER" $1.95 the treatment lie gave mine. The KB is ADJUSTABLE now turning near 22, and the ST is over N v that on the ground. Ron’s address, and TOWHOOK others, are at the end of this mess. BOTH FULLY ADJUSTABLE To make a long story short, there is AVAILABLE AT FINE HOBBY SHOPS EVERYWHERE an engine you can afford and get hold of, that is competitive. And remember Add 35 cents postage and handling. California residents add 6% sales tax. that consistency is more important than top revs... Every time. ^S C O TT RESEARCH CO., P.O. Box 22, Costa Mesa. Ca. 92627J MOUNTS The engine you settle on will deter­ mine the mount you use. There are five ROSS, Wallace, SAIL POWER, A l­ to choose from this time. For the Rossi, fred A. Knopf (1975) Lib. Cong. No.- ST and Taipan, there are pans by Ken 77-154937 Oliver, Guy Shaw and ST. I like the SCHULT, Joachim, TACTICS AND streamlined circular section o f the Oli­ STRATEGY IN YACHT RACING, ver, but you might like the extra room Dodd, Mead and Co., (1970) behind the engine available in the Shaw SHIELDS, Cornelius, CORNELIUS mount. The ST is similar to the Oliver, SHIELDS ON SAILING, Prentice-Hall, but lighter and, in my opinion, more Inc., (1968) Lib. Cong. No.-64-140l1 fragile. They all cost within pennies of TWINAME, Eric, DINGHY TEAM each other, but the ST is a little harder RACING, Adlard Coles Ltd., (1971) to find. The other pan mount is by BOLT ON A 2b", POWER INCREASE TWINAME, Eric, START TO WIN, Tatone. It ’s the cheapest to buy, but AND BE QUIET TOO' W.VJ. Norton and Co., (1974) Lib. often needs work to dress the mounting Cong. No.-74-10814 surfaces and clear the engine. For the Tests show a Fox Muffler increases power WALKER, Dr. Stuart, WIND AND Kosmic and KBS engines, the best while lowering noise level at no increase in STRATEGY, W.W. Norton and Co., mount is not a pan, but a machined fuel consumption. (1973) Lib. Cong. No.-72-6453 forging by CB. It’s big, heavy and Construction Features: * * * — Lib. Cong. No. refers to Library nearly indestructable. I believe it was Chamber machined from solid bar, integral designed for QM Pylon racing, and fins cool and stop wall resonance. o f Congress Card Number. · All parts buffed to high luster. provides the solidest mount o f all. Also the least expensive. If the CB or Shaw 60 size supplied with cast adapter and ORCA ...... Continued from page 41 machined to fit most popular motors. mount are to be used, you’ll have to don’t buy the pieces, assemble it and deepen the nose o f Orca to match. 40 size supplied with adapter for FOX 40 win your first contest. The planes are and FOX 45 motors. About an 1 /8 inch or so. not easy to build . . . half-baked methods TIMERS Other adapters available soon. will not do the job. So if you aren’t The choice of timer is improving, ready to earn the rewards with care and He the first on your field to sport this classy too, with Seelig and Monks foremost new look. attention to detail, maybe FAI is too- for automatic airplanes, and Tatone and too for you. O f course, any event can be Note · These mufflers meet all AMA require­ KSB for conventional. I’ve built a couple ments for sport and pattern flying. equally demanding, if you intend to win. in according with Bill Hunter’s article 40 SIZE MUFFLER »90302 $18.95 This is exactly the point of this semi­ in MB (March ‘75) and really like them. 60 SIZE MUFFLER »90303 $24.95 sermon. If you are, or want to be, suc­ Took about fifteen minutes to make a FOX MANUFACTURING COMPANY cessful in AMA events, you can shut 'em flood-off for my A ship. Cost under $5 5305 Towson Ave. ■ Ft. Smith, Ark. 72901 down in FAI too! to boot. It's pretty much a toss-up be-

82 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER t-éSPECM LT/£S // Now available, after three years of testing and development, a precision die cast aluminum Safety Shear Rudder Blade Assembly for .40 and .60 class boats. SS Rudder Assembly complete...... $12.95 includes: Safety Shear Rudder Blade, Shear Pin, Shear Pin Retainer, Control Arm, Pivot Pin, Pivot IMPACT Bracket, Mounting Plate, extra Shear Pins and extra Shear Pin Retainers. All seven component parts can be purchased separately. SS Rudder Blade o n ly ...... $7.95 may be used in Marine Specialties HBR and 2/3AR Rudder Assemblies.

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tween the Seelig and Monks. Both have and that’s good ole wood. Well, not old Oliver pans and Seelig timers: Doug all necessary functions, both cost over wood, exactly, but the nice, maple ones Galbreath, 707 2nd St., Davis, CA $20, both are mail-order. Pick a color. made by Rev-Up that I order from every 95616. I use the Seelig, and when I mount it hobby shop in town every other week Shaw pans: FAI supply, Box 9778, properly and keep it clean, it (they) and haven’t seen yet! Interestingly, I Phoenix, AZ 85068. work fine. I’m going to see how much I use Rev-Ups in all AMA classes, except Monks timers: Colony Enterprises, can get out of the home-made type, 1/2A, and have never had to re-pitch 2337 Ewing St., Los Angeles, CA 90039. that’s for sure. one. Since wood is lighter than glass, the K&W props and pitch guage: K&W PROPS fly-wheel effect should be lessened. No Enterprises, Box 18895, Phila., Penna, The most attention I’ve seen paid to matter the type, constant inspection is 19119. props is in RC Pylon and CL, and the necessary, and I mean before every start. Bartels props: Aeromodels, Box 245, least is by the majority o f free-flighters, Both my good engines turn over 24 and Culver City, CA 90230. It’s astounding! A prop has to be match­ I never forget it. Don’t forget my ear- If I’ve missed a related product or ed to the engine, airplane and launch muffs very often, either. source, it ’s because I didn’t know it was method. An awful lot of fliers ignore We’re almost to the airplane, but there. the last, by the way. One who doesn’t first here’s where you can get the good Finally, the ORCA. (Thought you'd is Mel Schmidt. He sure seems to win a stuff you’ll need. never get to it! wen) lot. Might there be a connection, ďyou Engines and rework: Ron Sheldon, Orca has been flown in all configura­ s'pose? Fortunately the rules o f the 3157 Alum Rock Ave., San Jose, CA. tions; conventional, auto-rudder, and event narrow down the prop require­ ments. With a given weight and total area, the ships are alike as peas in a pod. The difference in performance then TRIDENT II RACING TRIMARAN FOR R/C boils down to airfoils, aspect ratios, moment arms, incidence, and stuff like FIRST PLACE IN 1974 AND 1975 36-600 ACCR REGATTAS that. All right, peas from different pods, • STYRENE HULLS AND DECKS »SEWN DACRON SAILS · HARDWARE but still peas. • 36" L.O.A. * 3 6 " BEAM · 6.5 LBS. DISPLACEMENT »600 SQ. IN. The prop you'll need will be seven •COMPLETE PLANS COMPLETE KIT (LESS W IN C H )...... S100.00 inches in diameter to start with, and 3-1/4 to 3-3/4 in pitch. The safest SAIL CONTROL WINCH S50.00 props are the full-strand fiberglass types, like K&W and Bartels. Don’t use plas­ CUSTOM R/C DESIGN FOR ALL BOAT SIZES tic. Period. Notice I said safest, not POWER - 40 IN. LB. best. The ones I use are heavy and not FAST - - 5 SEC. always pitched correctly, and they’re VOLTAGE 4.8 - 6V. hell to balance. The weight has become LIGHT ------8 O Z. a problem with the new, and ridicu­ SMALL -2 "x2”x5" lous, seven second engine run. A front FIRST PLACE rotary engine can windmill a measur­ IN '73 S/B ACCR, able length of time, and the rear rotors '74 36-600 ACCR are worse. The cure is to short-change 8< 7 5 50-800 ACCR yourself on engine run, which is silly, SHEET EXIT or use a prop brake, which just reduces G U ID E S - reliability of the system. One more gad­ $.50 EAC H * get to piddle with that will go bonkers Dearer inqwnet invited. * at the worst possible moment. I ’m gon­ PROBAR DESIGN na try a third alternative (if I can ever P.O. BOX 639 ESCONDIDO, CA. 92025 get my mitts on the wretched things) MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 83 nearly straight-away climb (I still like through yelling, "so what,” I ’ll tell ya! to see some right tendency), auto-rud- It ’s so’s I'll finish the miserable thing, Sailing Yachts Fot der brings the nose down smartly, and that’s why. When you build a wing or Radio Control the two-and-a-half degrees of incidence fuse first you can sometimes put it (CG is now at 67%) give a smooth, bou- aside or lose interest or be diverted, and yant glide, with quick recovery from say, “ Oh, I’ll finish it some other time.” turbulence upsets. Considering the ultra But nothing nags me more than to have simple single-line V.l.T. system describ­ a stab laying there, leering, humming Ί ed and shown, I don’t see much point in ain't got nobody’, Drives me berzook! building the conventional version. An So I build a fuse and pin it on to shut it automatic Orca will beat i t ’s ears off. up. Well, when you’re that far, you You might as well face it now; in any know you’ll finish the toad. Who can FAI competition, you just aren’t going ignore a four-foot fuselage with a hap­ to find any bum birds or fliers to walk py tail? over. A t the USFFC there are generally So let’s start with the stab. All right, 20 to 25 guys entered in Power and I be pugnacious, skip to the wing. I don’t ain’t too happy about taking on ANY care, you’ll come back here sooner or of them. To rub salt in, I now have later. See you then. BOTH of the Simpson brothers within STAB CONSTRUCTION 100 miles. Oh, well . . . back to the bird. If you’re using the CB or Tatone For those o f you fond of numbers mount, use hard wood for the whole and reasons and such trivia, here’s Orca’s stab. Otherwise, use 6 to 8 lb. stock. LENGTH 50 In vital statistics. Projected wing area (what The stab bottom sheeting is trimmed, BEAM 11 \ In holds it up) is 448, and aspect ratio is butt glued with Titebond, and pinned SAIL AREA 800 sq m $74.95 around 8.4, also projected. Double taper flat. Doesn’t have to be over the plans, Complete kits include molded plastic platform is used to give a high aspect ‘cause you gotta mark the rib and web hull and components, all rigging, finished ratio while providing a large root section positions anyway. The leading edge is sails and semi-fipished wooden parts. for strength. The airfoil is the Neel- glued on top of the sheet and the trail­ meyer, a DGA from MODEL BUILDER. ing edge is butt glued to the edge. Now TAHOE SAIL SYSTEM $27.95 The foil operates at near 1-1/2 degrees install the ribs and webs, one bay at a VALKYRIE SAIL SYSTEM $35.95 in the climb and another degree in time. That way you don’t need a micro­ glide. Stab is 27% of the projected area meter eye to get the webs the right and 8% thick. It’s a zip-zip airfoil, but I length. Let this dry at least over night. I/ÍČTOR PIIOOUCTS was looking at the Rhode St. Genese You can chop out wing ribs while you’re 11715 Adenmoor Ave. Downey, Ca. 90241 28 while I was zipping. Wing is 1/16 waiting, or chuckle over what you’re Calif residents add 6* lax DEALERS WELCOME sheet and stab is 1/32, necessary to going to do to your favorite competi­ achieve the 67% CB without ballast. tion enemy, who’s usually your best pal. automatic. It’s safe in all of them, too, This is the first Orca to weigh less than I find this very enjoyable. You wouldn’t but top performance demands the auto 28 ounces. It weighs 27, less fuel. Mo­ believe what you can do while crouching set-up. Why? Glad you asked! In con­ ment arm is moderate at 43% to handle over damp glue. ventional form, incidence is fixed at one turbulent air, which is what I mostly Our scene opens next day to find you and one-half to one and three-quarters find to fly in. unpinning the framework and trimming degree and CG is at 80%. For a good Experienced builder or not, if you the leading edge to match the rib con­ transition, climb turn is necessary, de­ choose to make this monster, read the tour. The top sheeting butts against the tracting from the altitude it can reach. rest of this book. Peer at the plans. Ask trailing edge and laps over the leading Down and left thrust are required, fur­ yourself, "What the hell is this weenie edge. Use water-thinned Titebond to ther inhibiting climb speed, and the doing?!” And read it again, / know what glue and masking tape to hold the low incidence makes stall recovery dicey I’m doing; this whole thing is to explain works together. Now pin it flat and for­ at times. Adding auto-rudder reduces to you what I’m doing, and maybe help get it for a couple or more days. White the climb turn from 1 /2 in seven seconds you avoid busting yourself in the foot glues takes forever to dry when en­ to 1/4, increasing altitude appreciably. on your first flight. closed. When it is finally dry, sand the The AR also insures a good transition, So shape up! Mercy! leading edge round, knock the edges o ff but you still have that low incidence! I always build the stab, fuse and the tips, and epoxy a two-inch length of The automatic configuration allows a wing, in that order. When you’re all one-inch wide nylon tape around the leading edge center. That’s all at this point. FUSELAGE CONSTRUCTION C A R R S A IL S Which includes the fins. Several sub- assemblies can be made while other parts are drying, which can save some 7607 GRESHAM ST. time. The key to this technique is to make up a kit o f all the parts involved. SPRINGFIELD, VA. 22151 Then when you get to the glue slinging STANDARD CH AIL CARR SAILS stage, you can move like a 1930 movie. Finest Amer Ican-nedi DACRCfl sailcloth. V in y l, press-on numerals and In s ig n ia . Did you remember to mark a center- Heat sealed edges eliminate fraying. line on each former? Select a piece of Coated.stainless steel Jlbstay Installed. Rolled-edge grorr.mets In tacK .cle w A head. straight-grained (whatever that is) 1/8 B o lt-ro p e m a in s '1 lu ff mast attachm ent. sheet about 2 inches wide and four feet Santa Barbara - $30.00 10-Rater - $30.00 East Coast 12-Meter - $30.00 50/800(M-class) - $30.00 long, and mark a centerline along its 36/600 - $25.00 Internat. A-class- $35.00 length. Mark the former positions and west Coast 12-Meter - $30.00 Star 65 - $30.00 Vanguard wJ"-boat - - $60.00 T&A Petrel - - $30.00 pin it down. It’s nice to have a flat Scale vessels, special purpose boatš, one-of-a-k1nds: Write bench for this, but you can do with fo r a quote, and fo r our 1975 Brochure and Used S ails L is t . less . . . I do. Using fast epoxy or Hot

84 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER Stuff, install the formers, matching cent­ erlines. Don’t put in the firewall yet. Be sure there is one degree o f left thrust cut into the end of the sheet. Now, Tite- bond the spruce bottom longerons in place. While this is drying, laminate the pylon, using epoxy, Titebond or Weld- wood contest cement. Believe it or not, the tank is next. Modify a Perfect No. 6 tank, or equivalent, per the plans. No leaks, please, unless you have a passion for apoplexy. Before soldering in the tubing, make a paper template of the end o f the tank, clearly marking the účel IjJ tubing locations. Now laminate the fire­ walls with epoxy. Is the fuselage dry yet? How about the pylon? Figures. We SO" SOLINC-M don’t need the pylon yet, but you can shape and sand it if you’re in the mood. $377 oomplete j f a d < )-- ;' Now that the bench is covered in wet JleXAH® parts, trace the side onto some straight 1/8 sheet. The left side should be shorter to maintain the left thrust and both sides should show one degree of down thrust. I . 70" SANTA BARBARA Is anything dry yet? The firewall is? $378 lese ballast . ___® Peach-keen, drill it to match your motor mount and install the mount to seat the blind-nuts. Now position the tank template on the back of the firewall about 1/4 inch up from the bottom edge. Mark the tubing positions and drill through firewall and mount to 210 EAST ORTEGA STREET Mall order only. No discounts. Write for clear the fuel and pressure lines. Now SANTA BARBARA, CA 93107 Information. see if the tank lines poke through. Glad that chore is done! By now the fuselage sub-assembly should be dry. If your Now, put in the front and rear stab bench really is flat, I’ll buy it! Mean­ rests, with epoxy around the tubing and PEA DESIGNED BY time, glue the right side in place. If your in a fillet around the front rest. Now Tom Protheroe bench is like mine, unpin the frame and have a cup of coffee, I’ve run out of glue the side in in the air. The straight lead. bottom o f the side will align the rest of Next comes the top sheeting and ΛΜΥΑ CLASS the assembly. While this is drying, cut nose doubler. While this dries, glue the and glue the wing table together. Follow trailing edge stock to the bottom of the 709 36/600 by fabricating the fin. Hot Stuff is wing table. When this is dry, epoxy the e tK handy here. Now go back to the fuse table to the pylon. It ’s easier to keep it and glue in the upper right longeron and square at this point. Carefully cut the then the upper left. Cut and bend the slot for the pylon and trial fit to check AR and VIT tubing and glue into the the incidence. The front o f the table appropriate notches. Where they cross, should be not less than 1/8 higher than the V IT line goes inside. Sorry you the rear, while 5/32 is even better. This started this heap? That’s why we built is measured from the bottom of the the stab first! fuselage. With the pylon in place, poke Now’s the time to pin the left side the tank through the firewall and trial in place so you can locate and cut the fit this assembly to the front o f the tubing exits. When this is done, glue the fuse and the pylon. Trim to get a good left side in place. This is followed by the fit. Now epoxy everything that isn’t al­ doublers in the nose. Use epoxy here. ready, and head for the nearest bar. WRITE or CALL 213-661-7928 FREE CATALOG $ 2 9 . 9 5 EASY AS 1,2,3! KIT FEATURES HUSON 36's f i n i s h e d FIRST, SECOND a n d THIRD a t t h e • COMPLETE SAIL CONTROL MECHANISM

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MI-STARTS - PARACHUTES-RUBBER LEISURE PRODUCTS DEALERS & DISTRIBUTORS STD.TERM M S LIMITED 6 9 2 0 BRADDOCK ROAD P.O.BOX 30748 ANNAN DALI, VIRGINIA 22003 1 .4 . CA. 0 0 0 3 0 ) MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 85 I really like sheet wings for their stren­ gth and airfoil fidelity. Build in four, separate panels. Again, use 6 to 8 lb. wood for the sheeting. Note that rib BRUTE * β thickness and web thickness and spacing are graduated. Don’t deviate. There’s enough o f them running loose already. The four skins can be cut to shape and POWER! butt glued. Don’t really need the plans, again, as all members have to be marked. Pin down a bottom skin, glue in the £ 0 leading edge doubler and follow up with URSUS R/C the leading edge. Look at the plans and Power to spare for R/C scale, pattern and sport. pick out the line labeled Rib Ref. Line. Bore — 0.94 in. The Ursus .60 R/C puts Hold the front o f a full size rib against out a full 1.55 HP on this line and cut at the inside o f the Stroke — 0.87 in. FAI fuel, more with the leading edge. Whack the rear end of the Perry Pump and even rib off 1/4 inch short of the trailing Disp. — 0.60 cu. in more with nitrated fuels! edge o f the skin. It's the most powerful Now mark the proper leading edge Wt. - 17.5 oz. front intake R/C engine height, measuring down from the top. available today! The Place a straight-edge from here to the Perry Pump Ursus has the usual fine trailing edge (which comes to a point) versions available. engineeringandcraftman- and lop o ff the excess with your pur­ ship found in every OPS ple-handled Uber Skiver. engine. Remember, all This method keeps the high point of engines have Schnuerle the foil in a straight line. The wing has porting and ABC piston zero sweep in spite of the taper. When and sleeve design. Go the rib shape is right, cut the notch for with OPS and you go the doubler and glue in. with the best. Once all ribs and webs are in, it’s time for the built-in warps. Unpin the Skz*H noc6 (fa ttfie ttfio K y m fw itÍ edge o f the panel, shim up the proper P. 0. BOX 26247-A, NEW ORLEANS, LA. 70186 amount, and pin down again. The top sheeting will lock the warp in. The top 1-(504) 242-5967 sheeting butts against the inside o f the leading edge and stops 1/4 inch short of the bottom trailing edge, a separate cap FREE FLIGHT strip is used to fill the gap. HARDWARE After drying for a couple of days, tools. Accessories λ præcision c asting s ^ trim and sand the edges and ends and we’re on the home stretch! Caramba! WINDING Λ BALSA Epoxy the tip panels, blocked to the HOOKS STRIPPERS correct height, to the mains. Repeat uNUMireo to p e a m u t » · " AMD 3θ” LENGTHS with the mains. Using epoxy, wrap the tip joint in 1-1/2 wide cloth tape, and dETEX K S E1RELETBW the center joint in 4 inch wide cloth PLATE tape. Ě0UPE HUB D-T KIT HOOKS . . . this beautiful Monocoupe by Megow? COVERING AND FINISHING PITS: POPSTER 29, KAB One of the four most super-detailed POP o r ^^^ T O R P E O O . OAR 19 AMD 23 We both thought we’d never get here! CATALOG S 1.00 — s plans that Megow ever made. We have this, plus many others, print­ The wing and stab are covered and trim ­ dIM ERØEKET REPLICAS ed in clean black line. For catalog, send med. About 5 coats o f thinned dope 1442 N. FRUIT AVE. ,50c. refundable with first order. (any kind) will do nicely. I cover the GOLDEN AGE REPRODUCTIONS FRESNO, EA. 93728 fuselage (up to the pylon) with silk- P. O . B o x 13, B ra in tre e , Mass. 0 2 1 8 4 span, using 6 or 7 coats o f dope. The Back to the salt mines. Remove the nose and pylon are painted with thinned mount from the firewalls and puta dab We now have nice, solid nutplates for Hobbypoxy II. Use dope thinner to cut of clay in the blind-nuts to keep the mounting the timer. They’re drilled and it. Color scheme should include a dark glue out. Cut and taper the right check tapped later. Fill in between the stab color for air visibility and a light one and glue in place. Now for the left rests, and behind, with medium sheet. for ground. The 1/32 ply scuff plates cheek, which is not just slapped on. Cut and glue the end cap for the rear are epoxied to the wing and stab trail­ First, locate the timer position on the end. A t long last, epoxy the fin and sub­ ing edges. Bend up and epoxy the stab fuselage side, and cut an opening that fin in place, carefully aligning both with hooks in place. Locate and drill a 1/8 the mechanism will just fit through. Lo­ the pylon. Carve and sand the corners hole in the stab in line with the tubing cate the timer position on the cheek, to a radius and fair the front end into in the rear stab seat. Glue 1/32 ply and cut an opening that the whole the mount. Using epoxy, wrap the nose around the rear stab seat to form a well timer will slip through. Glue the cheek and firewall with 2 inch wide nylon around the tubing. Mount and square in place. You now have a recess with a tape. Set the hateful thing aside, run out up the wing and add split dowel keys. ledge at each end. Cut two pieces of and kick the fire hydrant or bite the The stab doesn’t need keys. 3/32 aluminum to fit these ledges. garden hose . . . Wizz on the petunias? HARDWARE Epoxy in place. Now cut two pieces WING CONSTRUCTION Now for the tricks! The flood-off of 1/16 plywood to the size of alu­ Wing construction is almost conven­ release is clearly shown in the photos. minum and epoxy them over the metal. tional . . . for a sheeted wing, that is. Or buy one from Crockett, they’re neat.

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Mount the pan, engine and flood-off the jagged gap into a smooth slot. Mark device. Cut the exhaust deflector from a second line 5/32 above the existing .010 brass and install. Mark the timer one. Mark a spot on this line 17/32 to holes, drill and tap 2/56 and mount the the left o f the left end o f the slot. Drill //ŤG13N ΑΕΉΟ timer. Now for the auto-rudder. Thought a hole here. Cut both release arms o f the I’d forgotten, din’cha? You’re right, but timer, the V IT arm to 3/16 and the DT I H TAKE A TERN no harm done. Cha-cha to the end of release to 1/4. Slip the piece over both Í FOR THE BJST ! the fuselage with the fin on it and these arms and check to see where the WITH THI whack a rudder out of the trailing edge. VIT arm lays. Elongate the DT hole THE QUALITY LINE Use a sharp whacker. Recess the fuse at along its centerline until the VIT arm is the base of the rudder about 1/16 inch. hard against the front o f its slot. Care­ Epoxy a piece o f 1/16 plywood into the fully elongate the DT hole forward of FLYING MODEL AIRPLANE KITS recess for the adjustment bracket seat. the pin 1/8. This is the glide incidence Bend, drill and tap the soft aluminum setting. When the V IT lever releases, the Scale · Semi > scale · Non- scale ‘U’-bracket, and screw and epoxy in piece rides back against the DT pin, al­ CATALOG 35c place. Cut 3/32 o ff the bottom o f the lowing the stab trailing edge to rise. The rudder to clear this fitting. Now epoxy VIT pin should slip completely through TGTCN AG130 CO., inc. CHICAGO, ILL., 6066B the aluminum tubes in place on the its slot. Be sure it does. A t DT time, the rudder and fin. Epoxy thin brass or piece is released and acts as the DT glassboard plates to both sides o f the lim it. One line. No hammers. No screws. including the timed DT. Stab snug and rudder where the adjusting screws will Now trim away all excess metal, leaving square, auto-rudder position and a dab ride. To mount the rudder, cut a small a smooth curve like a very flat S. (Would o f silicone or rubber cement on the slot in the fin along the hingeline. Slip you mind going over that paragiraffe screws. And we’re ready to fly! You the wire hinge post through all three again? wen) believe that? Gotcha! We didn't check tubes, tuck it into the slot, and fill with Bend up the stab retainer from .040 CG position. Should be 5-1/4 to 5-3/8 epoxy. Bend a small hook and epoxy it wire, squashing the loop a little. Use 1/2- from the leading edge at the root. to the right side o f the fin at the base A control line lead-out cable for the Wrap a Baggie around the engine and and well forward. This is for the AR V IT/D T line. Loop an end through the o ff to the tall grass. Hand glide, with tensioner rubber band. Cut the ply rud­ stab retainer, wrap and solder. Keep stab and rudder in glide position, look­ der horn and trial fit. Trim to avoid this joint small, to avoid interference. ing for a trace of right turn and no out­ interference with the bracket, and epoxy Run the cable through the fuselage and right stall or dive. A t this point we want in place, with a fillet all around. Run strap the stab on snugly, retainer in enough o f a glide so the thing won’t braided nylon trolling line through the place. Slip the VIT fitting on the timer crash before it can DT. Run up the en­ AR tubing, and tie to the horn. Run with both levers engaged. Run the free gine and check all timer functions. While 2/56 nylon screws into the bracket and end of the cable through the hole in the you’re at it, set the needle valve for adjust for neutral rudder with tension fitting, pull tight, wrap and solder. Strap about 18 grand and be sure the flood- on the line. Slip a ring over the AR re­ the stab on as for flight and check the o ff really shuts it down. Rossis’ and lease wire of the timer and tie the operation o f the whole system several Tigres’ will idle along quite happily at other end o f the line to it. Adjust the times. For a starting point, set the AR times if the flood is insufficient. It’s right screw for about 3/32 travel with to trip a blink after flood-off, and VIT embarassing, if not fatal. the tensioner band installed. about 1 second after AR. Run through Set the timer for 3 seconds engine Stop making noises like an engine, several times. The first mistake will cost and 30 to 40 seconds DT and light o ff and let’s finish this flaming fliegle! you the ship. Depend on it. the engine. Launch at 45 degrees into, Procure (how’s that for class?) or PREFLIGHT a bit right of, the wind. A t this power otherwise obtain a piece o f hard alum­ A little time here will be well spent. setting, Orca will move at a good clip in inum, about 3/8 by 1-1/2 by .030 thick. Now’s when we look for little things pretty much a straight line. She may Mark a line the length of the piece about like missing needle valves, warps, holes lean a little to either side after 2 sec­ 1/8 from what will be the bottom. Drill and such-like. And find ’em! From the onds. So far, so good. Don’t expect a hole, about .040, on the right end of nose; a balanced pitched prop, snugged much of a transition, but watch the the line 3/32 in. Drill two more holes down, no cracks or discolorations. En­ glide. Trim by adding weight to the ap­ about 3/16 apart another 1/4 inch in. gine bedded down, fuel and pressure propriate end, leaving incidence alone. Look at the photos again. Now drill out lines installed and unkinked, flood-off Use the same timer run and wind the the metal between these holes and file release free, wing keyed, timer operation engine up a little tighter, 19 to 20.

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 87 The Boy’s Model Airplane Book, on scratch building a compressed air engine. This reprint alone is worth the price of the catalog . . . a scant $1.00. A com­ W hat kind o f covering plete product and price list is available for another $.30. The 1976 edition of the Vintage Aero catalog is available do you prefer? from Vintage Aero, 1 The Glen, Tenafly, New Jersey, 07670. * * * 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 Fulton Hungerford, the spoke wheel can be used as is (the filler coat is built in) or painted, requiring one-third the paint. man, will soon be producing stainless It's very economical. SILK? If you like silk, we recommend Super Coverite that can be easily ironed-on. It looks like silk, but it's 100 times stronger. Like Silkspun, it steel wire spoke wheels for gas models. can be used as is or painted. Being a woven fabric, it’s very authentic. MYLAR? If Sizes and prices have not yet been you hate to paint, but are tired of the way plastic film mylar scratches, sags, rips firmed up, so if you are interested, it and shatters, we recommend iron-on PermaGloss Coverite. It comes with 4 coats of would be best to contact Fulton directly. special paint bonded permanently to its upper surface. Paint that won't scratch, is His address is 1770 Lilac Circle, Titus­ fuelproof, rotproof and fadeproof. It is 150 times stronger than mylar, tissue, silk or anything else. ONLY COVERITE COVERINGS MEET THESE RIGID TESTS: ville, Florida, 32780. If you are not Shrink Test: With household iron, shrinks drum tight, wrinkle free (even around familiar with FH wheels, ask a F/F compound curves). Will not sag like plastic mylar films, nylon, tissue or silk because scale nut. FH silk thread spoke wheels Coverite has a permanent shrink memory, but will not warp airplane structure. are nothing short of incredible. Abrasion Test: Withstood 3600 cycles on Taber abrader (500 gram load). Sunlight * * * Test: 6 months under glass exposure in Florida sun. retained 4X more original tensil and tear strength than silk. Temperature Test: Withstood up to 400°F. Did not After several years o f development, become brittle at below freezing temperatures like plastic films. Chemical Test: Virtually impervious to engine fuels. Humidity Test: Resists water which causes Hi Johnson Model Products is ready to oth e r coverings to swell and sag. Rot and Mildew Test: Buried in soil 8 weeks release the Saloma R/C sailplane. This without change. Strength Test: Far in excess of 25,000 PSI tensile strength. kit is totally different from anything COVERITE IS EASIEST TO APPLY 1) Requires no offered before. It uses wire cut foam fancy tack irons; ordinary household iron is fine. 2) New improved Quickstik adhesive surface sticks wings, which are sheeted with a high tighter than ever when properly heated. 3) Requires density foam sheet (see January 1976 minimal sanding. Hides far more defects than any MODEL BUILDER for details on con­ other covering. 4) Requires no pre-doping of struction methods) and a four-piece structure. 5) Takes less paint due to built-in filler vacuum formed plastic fuselage, to pro­ coat. But all Coverite coverings can be used as is, without any paint vMiatsoever. duce a 100 inch span sailplane suitable PermaGloss, however, has 4 coats of for experts or beginners. The wing almost indestructible paint bonded to its uses a progressive airfoil which changes upper surface. 6) Requires no special from a 12% thick undercamber at the handling. Won't scratch or burn up dur­ ing application. 7) Can be trimmed with root to a 12% flat bottom at the tip. paint, any decal including mylar, or with Each wing panel has 3 degrees washout itself (which is goofproof because it can be built in. The large all-flying stab and e-heated again and again). dynamically balanced rudder provide smooth control, which can be adapted to the pilot's flying ability by changing the amount o f throw. The kit comes complete with all necessary hardware, including Hi Johnson Trim-lock push- JJJJ rods, Hi-Loc control horns, and poly­ propylene hinges. The modulated airfoil provides a broad speed range for com­ petition, and the long nose and tail moments provide stability to make the 2779 Philmont Ave., Saloma suitable for beginners. The Huntingdon Valley, Pa. 19006, U S A ASA plastic fuselage can be glued with most model cements, and is easily re­ paired. Available from dealers or direct, the Saloma will sell for $44.95. Manu­ There’ll be a noticeable difference in C ounter...... Continued from page 8 factured by Hi Johnson Model Products, 11015 Glenoaks Blvd., Pacoima, Calif., climb speed and this time we’ll correct version for $8.95. Custom voltages are any left turn tendency with a touch of 91331. available on special order. The Flite * * * right rudder. If all’s well, keep the en­ Lites are available at hobby dealers or gine setting and increase the run. Once direct from Advanced Devices. Fact o f life . . . it takes pressure and past 4 seconds, the transition should * * * control to fill a pen bladder or pacifier shape up. A t full power and 7 seconds, If you fly free flight scale, or sport fuel tank. One cure for the problem is it may be necessary to delay AR to pre­ free flight, or can remember Megow kits, the new Tatone Products Syringe- vent an actual dive. Likewise the VIT to or if you just like model aeroplanes, Fueler. This is a molded polyethylene prevent zooming. With low incidence, a you need a Vintage Aero catalog. This syringe with a neoprene plunger. The straight-away climb is impressive, but company specializes in the old, obscure, plunger has a built-in stop ring to pre­ makes me nervous. I like to see some and unique in aeromodeling. It offers vent it from being accidentally pulled right, just to know it won’t go left in a recreations of the Ideal kit plans, Megow out o f the barrel, unlike most medical- gust. Trim the glide turn for about 45 and Continental replica kits, and an type syringes. Also, it is graduated in seconds using the rudder and, if necess­ incredible assortment of rubber power 1/4 ounce increments. Any dirt or sedi­ ary, stab tilt. Treat Orca with respect, materials and accessories. Included in ment can be easily seen through the she’s got teeth! Fly safely and fly free. the catalog is a 15 page reprint from clear plastic barrel. For $2.95, the

8 8 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER MODEL RACING PRODUCTS. INC. 12702 N. E. 124TH STREET KIRKLAND. WASH. 98033 Μ 500 ROAD RACE KIT PHONE: (206) 827-8607 NOW YOU CAN GET THE BEST HANDLING STOCK CAR KIT,

less body, for those who have a preference in body styles. Includes: Power pod with axle brake, 65 tooth drive gear, complete 14 tooth clutch and flywheel, nylon wheels with tires mounted and trued, aluminum chassis, offset kingpin kingpin front end assembly . . . guaranteed not to break, bumper, wing and mounts, hardware, linkages, and instruction manual.

ASSEMBLED AS SHOWN, LESS Model Racing Products Inc. BODY ...... $110.00

Syringe-Fueler is available from dealers, Birds...... Continued from page 18 or direct from Tatone Products, 1209 Geneva Ave., San Francisco, Calif., The “ total” bird is therefore a blend of 94112. features, and sometimes a compromise * * * is necessary. Nature practices “ design trade-offs” in its engineering, too! The M.A.B.A. biplane fliers should be Consider the wing of a soaring bird: glad to see the introduction of a high being jointed at the "elbow ” it can quality, sprung, steerable tailwheel allow the bird to sweep his forearm assembly. The C.B. Enterprises Tail- (outer wing panel) forward and back­ TYRO PLAYBOY SR. 80” SPAN wheel assembly uses a leaf spring ward with respect to its upper arm Old Timer R/C or F/F. Completely pre-cut. assembly together with a double-sided (inner wing panel). If the center of Formed wire landing gear. Stressed for R/C. rudder horn and heavy duty axle mount pressure (c.p.) is considered to be in Meets all Old Timer requirements. to provide a rugged tailwheel mount for the vicinity of the 30% chord point, S39.95 — (Plus $1.50 postage) large R/C biplanes. The leaf spring then by sweeping his wing fore and aft, assembly is shipped straight, but can be TYRO MODEL & SUPPLY the bird can change the relationship bent by the modeler to any curvature. P.O. Box 11511, 1930 Edgewood Dr., between its center o f gravity and its c.p. Coil extension springs protect the rudder Palo Alto, California 94306 This will create a pitch-up or pitch-down servo from shock damage. The tail- Phone: (415) 321-2898 moment, respectively. In most under­ wheel assembly, complete with one-inch cambered wings, the center of pressure excessive pitch-up. Tip pinions are wheel sells for $7.95. C.B. is also travel is rather large for normal changes spread, and optimum soaring configura­ marketing the fiber-filled nylon double in the angle o f attack; but in wings tion is achieved, wherein the bird can control horn separately. These horns having reflex or even semi-symmetrical circle tightly without stalling. Although are molded with a "U ” -shaped channel airfoils, the c.p. change is either small or the mean chord moves outwardly in this section which wraps around the control non-existent for all useful angles of mode, the elbow joint is locked and the surface. They can be mounted with nuts attack. Thus, by changing the shape total wing assumes an almost perfect and bolts or epoxied in place. Both the of its airfoil, the soaring bird can elastic curve. tailwheel assembly and the control horns control c.p. movement or stabilize it in Strangely, the tail is not primarily a are available from C.B. Enterprises, the precise location needed. Neat! pitch control device; that is, an elevator. 21658 Cloud Way, Hayward, Calif. In a rearward sweep o f the outer wing To be sure it can be used this way when 94545. panel, a couple o f interesting things necessary, but it is not ordinarily needed. * * * happen: projected area decreases, c.p. The tail is employed for yaw and roll as Harold Cunningham has completed a moves aft, and the mean chord o f the well as for a drag flap. I ’ve watched book entitled “ The Model Engine.” The wing moves inboard. The pitch-down red-tailed hawks from a distance of fully illustrated book covers the work­ moment and reduced wing area put the only ten feet or so, soaring outside my ings and problems of glow engines, bird into a high-speed glide, while the canopy in the same thermal. Their tails including chapters on Tips on Easier inwardly shifted mean chord allows the are constantly adjusting by "twisting”, Starting, Mufflers, and Problem Solving wing to better stand the increased forces that is, rotating about the centerline of Made Easy. “ The Model Engine" will be produced by the higher speed. For their bodies. In extreme cases, the tails sold through hobby dealers for $2.95, or extreme diving speeds, the bird folds rotate almost vertically, becoming rudder can be ordered direct from J R Sales Co., his wings . . . outer panels first, and if and fin when vertical area aft o f the Box 552, Bowie, Texas, 76230. Harold necessary, inner panels, whereby it c.g. is required. This happens quite has combined information from engine plummets! often when birds such as the purple manufacturers and others with his own In an extreme forward sweep o f the grackle and blackbird are in their high­ experience, to provide an excellent outer panels, maximum projected area speed gliding or “ planing” mode, with trouble shooting manual for the beginner is achieved, c.p. moves forward, dihedral wings sloped in anhedral fashion. The and sport flyer. · is increased, and camber control prevents tail in this case seems to add yaw stability

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 89 NEW...TEMPERATURE COMPENSATED NYROD A ROD FOR ALL SEASO NS

NEW 8' METAL ROD IS PERFECT FOR THESE INSTALLATIONS - BEND AS NECESSARY NYROD inner tubing ιφιιιιιιιιιιι N E W ! B M E T A L R O D SU-PR-KLEVIS

If you would like to try some night- A r e y o u suffering from wear, damage , c o lliipse flying (it’s all the rage right now among or premature re 1 ease? If your s u f f e r i nq i s the R/C glider-guiders) I would suggest caus ed by tow hooks, relieve yourse If and i n- using something like a Slow Combat stal 1 a guaranteed that is expendable and has a handy fuse­ lage for attaching the light. The lights are fairly easy to get. You can order FLY HOOK them from RCM (check a recent issue The Fly Hook tow hook and mount i ng h a rdwa re for ad and ordering instructions) or, if that is stooping a little low, order the fo r g li ders and R/C s a i 1 planes can be you rs lights from the Brookstone Company. fo r $1.75 po st paid (Az. Res., add 5% ta X) Best bet is to write to them, asking for a catalog and then ordering. More trouble G L I D E R GUIDE R S but cheaper, as RCM sells three lights P.O. Box 1400 for $4.75, and Brookstone sells five for Valley Bank Center $5.25. Write to: Brookstone Company, Phoenix, Arizona 85073 121 Brookstone Building, Peterborough, New Hampshire 03458. to the bird. Tails are seldom motion­ experimentation with tip pinions and The other day I received a flyer less, however, and it seems the bird has gull-shaped wings on R/C sailplanes, about a new product called Lumiweld. need of a tail . . . even if it’s not for because it is possible that we could It ’s a special rod that supposedly allows climbing or diving. In most soaring, the improve soaring performance by 20% if you to repair aluminum and aluminum bird’s legs and feet are streamlined close we adopted some o f the bird’s tricks. alloys with nothing more complex than to the body and trailing behind, but In an extreme soaring mode, when a simple LP gas torch. I personally can’t movement o f legs and feet to a more the undercamber is maximum and the think of what I would want to weld that forward position has the effect of bring­ wings are very close to the stalling point, is aluminum, but if you have need for ing the c.g. a bit forward. This is a row o f leading edge feathers auto­ such a product, contact H.M. Sadler, particularly useful in landing and striking. matically pops up, adding turbulation 2105 School Drive, Rolling Meadows, The land bird strikes with talons ex­ to the approaching flow as it meets the Illinois 60008. tended, legs forward and down. The wing. The alula or vestigial “ thumb” Been thinking about building a Slow sea bird uses its webbed feet as landing near the wrist joint also behaves as a Rat for the new AMA event? John Kils- skids and water brakes. When necessary, leading edge slot to delay the stall and donk has already designed one that will the tail is lowered as a drag flap, and the provide turbulation at the angle “ break” be published soon, if it hasn't already. entire side view o f the bird with lowered in the leading edge. Motors are going to be a problem for this event. Who w ill be first to tackle tail assumes an almost perfect under­ (Next month, Jim Gray continues the problem head-on and simply sleeve- cambered shape. I believe that this with the structure of soaring birds' down a 40 to the 36 maximum displace­ improves the bird’s lift coefficient still wings, wen) M further for extreme high angle of attack ment? Several people in this area have flight, such as alighting in the smallest been doing just that for the past couple possible space under perfect control. C/L ...... Continued from page 33 years and, although they have had pro­ The tip pinions are aero-elastic something to do with proving that Stun- blems and it is a lot o f work, they have marvels which, when bending upward ters are not capable o f turning a 5 foot proven that a sleeved-down 40 is fast under flight loads, also rotate or twist radius as the AMA rule book calls for. I and almost bullet-proof. automatically . . . like feathering pro­ found the whole thing slightly boring, While shrunk-up 40’s make good pellers. I’m convinced that these pri­ but it did bring back an idea we had Racing engines, kind of makes it tough maries achieve washout for the wing as awhile ago but never got around to try­ on the novice or low-bucks racer out well as provide vortex cancelling for ing. Being a part-time F/F Freak, I have for a little cheap racing. It would sure improved soaring ability. I also believe been aware o f the night flying done at help if some manufacturer would come that the bird’s spanwise lift distribution Taft and of the availability o f light­ up with an engine that doesn’t break is as close to being elliptical as it is weight, chemical lights. In a bull-session cranks, eat bearings or split its case wide possible to achieve, such that the about two years ago, we decided that it open. approach o f airflow to every chordal would really be neat to fly Combat at Hey! I just remembered that K&B section along the span is at exactly the night, but never -did get around to doing recently came out with a "stroker” ver­ same angle. I would like to see some it. sion o f their “ snarly” 40. The stroker is

90 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER THREE TIME NATS WINNER!! Rhett Miller & Southern R/C Compensator

. 73, 74, 75 NATS WINNER • U.S. TEAM MEMBER

DELUXE KIT 114.95 STANDARD 79.95 64" SPAN, 54" LENGTH, 71/2-8 LBS.

SOUTHERN R/C PRODUCTS INC.

RT.3 BOX 47 NIMS LANE PENSACOLA, FLORIDA32503 a 41, and if you don’t know anything from vibration making the setting sound about F/F, you probably don’t even like it is too lean, the engine may have ADJUSTABLE SERVO ARM understand why a perfectly good 40 was cooled considerable and not be up to punched up to a 41 (it allows the use of operating temperature prior to the a 40-size plane in Class D Gas). Wonder launch, etc. how a K&B 40 with a short leg and/or ■ You don't care how the engine f squeezed-down bore would work as a sounds on the ground, you just want it 35 for Slow Rat. How about it, Johnny to perform in the air, so listen to the B.? There are a lot more Rat Freaks engine while flying and then adjust the around then there are F/F guys com­ needle accordingly, without regard to peting in D Gas, so don’t tell me you how the engine sounds on the ground. can’t do it because the potential mar­ If you consistently use this method of ket is too small. “ needling it ” , you will find that soon Continuing along with “ odds & you can put up one test flight, reset the ends” , how about a how-to-do-it tip for needle, and have a perfect run second all of the how-do-l-do-it modelers out flight almost every time. And only rare­ This accessory will permit you to preset there in MB land? ly get an over-lean run, which is, of the required arm length to match any Needle valve settings and how to get course, to be avoided whenever possi­ throttle or control surface movement them: Whether you are out sport flying ble. that is desired. We now mfg. this or competing, it is almost impossible to If you still have trouble getting nee­ accessory to fit the following servos. consistently pull out your plane, start it dle settings, write to me and for $5.00 Order by Stock No. up, and have the perfect needle setting in cash, check, money order, stamps, .984 each on that first flight. As long as you aren’t used-up streamers, blown plugs or caster going to have the magic engine run first oil residue, I will send you, postpaid, Stk. No. 33 - fits KPS 9 time up, why not play it safe and do as I Stk. No. 67 - fits KPS 10 twelve assorted needle settings, ranging Stk. No. 4 4 - fits KPS 11 do? I always start the engine, allow it to from “ zonkers” lean to blubbery rich. Stk. No. 45 - fits KPS 12 get warmed up completely on a slightly Washington state residents please add Stk. No. 46 - fits KPS 14 & 15 rich setting, and then set the needle, be­ 5.3% sales tax. Stk. No. 47 - fits World Eng. ing careful to set it on the rich side just A while ago, I got a new style Super- Stk. No. 48 - fits D&R a touch. I then fly the plane and listen tigre G-21 /35 from World Engines, and Stk. No. 56 - fits EK Servo carefully to the engine both in level supposedly I am testing it. Only trouble Stk. No. 64 - fits KPS 14 & 15 II flight and in maneuvers. After the flight, is that our weather is not very good Add .254 on direct orders. the first thing I do is reset the needle, right now, so I can’t always go flying according to how the engine ran in the when I have the chance to do some test­ ROCKET CITY SPECIALTIES air. Then I refuel, fire it up and fly it ing. So the engine is only barely broken- 103 Wholesale Ave., N.E. again, without adjusting the needle a in so far, and has only been in the air Huntsville, Ala. 35811 second time. If the setting isn’t right on five times. So far, the new Tigre doesn’t the second flight, I just go through the seem to be much faster than the old above again and keep at it until I get it G-21 ’s, which is a little surprising as the really hurt anything. Having the stack right. The important thing, I feel, is to new engine has, as supposed improve­ cut o ff short does make it easier to get not set the needle with the engine run­ ments, a double-dimple head, full-circle at the mounting bolts, and that is nice. ning (except for the first flight, of crank, raised exhaust timing, and the For break-in, I ran the engine on a course), as there are a number o f things exhaust stack cut o ff short, removing test-stand for almost an hour total run­ that can give you a false setting on the the small, threaded divider that used to ning time. Break-in fuel was mild, 5% ground. The bladder can be too full, giv­ be there. The divider certainly looked nitro. Prop used was a nylon Top Flite ing extra pressure and a rich-sounding offensive sitting right there in the path 10 X 3-1/2 cut down to 8 inches and engine, the fuel can sometimes foam o f the hot exhaust, but I doubt if it balanced. After about a half hour of

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 91 such person is Bill Pardue. I have never met Bill, but I get a lot of letters (vol­ J O H N P O N D umes of them!) that he has written, and I am aware o f most of the many things he is into in promoting C/L in general Old Time Plan Service and Speed in particular. It seems that all of B ill’s energy that should have gone The largest selection o f plans in the world at the most into growing big and tall has gone into reasonable prices. Each list 75c typing and paperwork that benefits us all (that was your basic, left-handed No. 5 OLD TIMER F/F GAS compliment!). No. 5 OLD TIMER RUBBER/TOWLINE The latest thing from Bill is a very No. 6 OLD TIMER FLYING SCALE A through K complete list o f where to get supplies No. 6 OLD TIMER FLYING SCALE L through Z for Speed flying. Products, services, names and addresses, the whole shot. If P.O. Box 3113 you need it, but don’t know where to San Jose, Calif. 95156 get it, B ill’s list can be a big help. Phone (408) 292-3382 Although I have a copy o f the list, there is not room in this column to give it to you. But you can get a copy if you FAMOUS BRITISH DIESELS are willing to help Bill, out by listing any B-C FLANS sources of Speed-related items that you P.A.W., M.E. & are aware of and sending them to Bill so D.C. Motors. he can add them to the list. Also en­ close an SASE and Bill will send you an CONSOLIDATED Finest diesel fuel. PBY-5 A "CATALINA” up-dated copy o f the list. Write to: Bill 9 FT. WING SPAN Diesel Data Sheets Pardue, 1201 Surry .Drive, Greensboro, A LL f»lBS Ö FULL FORMERS SHOWN ON PLANS !! N.C 27408. Tell him D irty Dan sent ya! PLASTIC ENG.COWLS 5 9 .0 0 PR. ( „ τ>Μ00β|> ONLv) AEROMODELLER Plans, CLEAR GUN BLISTERS % 6 .0 0 P R r The modeling industry is presently handbooks, and Annuals catering to the R/C market, and a lot of 4 LAACF p l a n SHEETS — Plans $13.50 C/L people kind o f resent this, as they 6 FT. WING SPAN MODEL PBY-5A VERON Rubber & RC Scale feel ignored. I think that is a little o r d e r one n o w / / Plans $ 10.00 kits. Catalog 25 cents. ______ADO $ 1.00 POSTAGE selfish and shortsighted on their part. CATALOG-OVER 50 PLANS 50$ DEALERS WRITE There is money to be ma^e in R/C, and HOBBY HIDEAWAY, R.R. 2 that means that many manufacturers are WORLD WIÖF Delavan, Illinois 61734 out spending tons of money to develop SID MORGAN 13157 O R M O N D ,B E L L E V IL L E , M IC H ,4 8 lllu .s.fl, (309) 244-7389 new and better accessories, many of which work very well on C/L planes. running, the engine would pull a flat )usl because it says R/C on the product, Kustom 18,000 rpm with the 8 x 3-1/2 and 5% don’t think that you can’t use it on that fuel. On the last run of the break-in new Stunter or Combat ship. Kraftsmanshi p period, the engine launched the rear Due to R/C’s popularity, we have bearing, throwing o ff the retainer. I never had it better as far as engine selec­ tion and quality, neato control linkages, A* thought ST solved that old problem when they went to a rear bearing with a Hot S tuff at $5.70 instead of $8.00, STOCK OR CUSTOM steel retainer. Guess not. Luckily, the super-easy covering materials, amazingly TUNED ENGINES full-circle crank did a great job of con­ low prices for supplies (due to the vol­ ume selling that R/C has added to the PARTS AND taining the shrapnel from the bearing, which means that the piston, cylinder industry), and on and on. COMPETITION In future columns, I will be turning ACCESSORIES and head weren’t crashed-out from pas­ sing odd bits o f retainer material. you on to a bunch of R/C-oriented ° + CČ items that I'll bet you never even knew I pulled the engine down and put in existed, and could use to advantage. In Fiberglass props, fuel shut-offs, solid a Fafnir bearing (thanks to American preparation, whip on down to the local lines and many other specialties you manufacturers for knowing how to hobby shop and ask for (1) Rocket City cannot find in hobby shops. make good bearings) and ran the engine stock no. 69, (1) 12 inch pushrod, also again. With the same fuel and prop I threaded 2-56 on one end, (1) DuBro was now getting a solid 18,600 rpm. A A complete line of COX .049/.051 solder link, and (1) 4-40 bolt, 1-1/2 change o f bearings picked up 600 rpm. inches long. Lay everything on the custom engines, including R/C Hmmmm . . . modifications. counter and try to figure out what to do Next time out we will do a little ex­ with these goodies. OK, I'll give you one perimenting with the engine in an effort All 1/2A products formerly by hint. Think control horn and what one at getting some hoped-for good speed Kirn-Kraft/Jim Clary Racing are that is adjustable right down to ittsy- out o f it. Wood, narrow-blade props now available soley from Kustom bittses would be worth to you on that may be required to get the engine to Kraftsmanship. honkin’, sensitive Combat plane. really honk, along with some 40% nitro Also due to R/C’s popularity and the For detailed brochure, fuel in order to make use of the raised amazing variety o f Scale ships (both in exhaust timing . . . hope the crank can send 13 cent stamp to: Stand-Off Scale and For Real Scale) take it. I’ll let ya know what happens. that are being offered by the manufac­ KUSTOM KRAFTSMANSHIP Every once in a great while I run turers, it kind o f amazes me that there P.O. Box 2699 across somebody who is willing to go to isn’t more activity in C /L Scale. The great lengths towSrd making this hobby vast majority of R/C Scale kits are of Laguna Hills, Ca. 92653 o f ours as enjoyable as possible. One very high quality and are easy to build.

92 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER CLASSIFIED ADS INDEX TO ADVERTISERS Non-commercial: Rate is 25 cents per word with a minimum of $3.00 worth. Ace R/C Inc ...... 95 Commercial Rate is 40 cents per word with a minimum of $5.00 worth. No Advanced Devices In c ...... 67 mail order discount house ads knowingly accepted. Astro Flight Inc ...... 6 4 All ads are payable in advance and may be for any consecutive insertion period Applied Design Corp ...... 66 specified. Name and address free. Send ad and payment to: The MODEL BUILDER. Cannon Electronics ...... 60 Classified Ads. 1105 Spurgeon, Box 4336. Santa Ana, California 92702 Carr S a ils ...... 84 Cloudbuster Venture ...... 78 WANTED — Will buy multi-cylinder model TISSUE PAPER, 10 cents per sheet, 19 C o v e rite ...... 88 airplane engines. In particular, the older colors, send SASE for sample. Bill Wilson, C ox H o b b ie s ...... 3, 4 spark ignition and certain glow ignition. All P.O. Drawer U, Kountze, Texas 77625. Jim C rocket R e p lic a s ...... 86 letters answered. Russel Sprague, 8800 Dumas Products ...... 2nd Cover Green Lane, Randallstown, Md. 21133. BOATS . . R/C ELECTRIC . . Solid state electronic, full variable speed controls, mo­ Du-Bro Products In c ...... 75 tors, special machined shafts, props, drive E.K. Products ...... 77 EXTENSIVE COLLECTION, magazines and systems, multiplex control panels, fire hose Flyline Models ...... 61 vintage plans. Lists $1.00. Guerrieri, 107 nozzles, sirens, whoopers, boat whistles, fi­ Fox Manufacturing ...... 60, 82 Alameda, Redwood City, Calif. 94062. berglass hulls, etc. Free literature. Write to: Gas M odel P ro d u c ts ...... 65 INTERNATIONAL MARINE EXCHANGE Glider Guiders ...... 90 "SAILPLANE DESIGNERS HANDBOOK." 17, Al Gray, 24501, Los Serranos Dr., La­ Carl G oldberg M o d e ls ...... 1 guna Niguel, Ca. 92677. New ideas and Easy, complete instructions. $5.96. Eric Golden Age Reproductions ...... 86 products welcomed. Lister, 953 Klockner, Trenton, N.J. 08619. G u lf S outh A e ro m o d e ls ...... 74 ANTIQUE KITS . . Solid scale, U/C, some Hobby Hideaway ...... 92 FORSALE: MODERNISTIC MODELS F/F, Stanzel, Girard, Edco, Berkeley, Mod- Hobbypoxy Products ...... 63 The late Hal Swanson's plan service: 5000 elcraft. Comet, Maircraft, Hawk, etc. Send Jef's F rie n d s ...... 66 plans, $750 worth of new blue-line prints, S.A.S.E. for list. The Control Tower, Middle Hi Johnson Model Products ...... 74 300 steady customers, two large storage Island, New York 11953. cabinets, etc. Bids start at $1000. Phone Kavan Model A ircraft...... 80 K & 8 M fg ...... 62 (213) 766-5868. FIBERGLASS sailboat hulls, R/C: classic FRIENDSHIP SLOOP (43", hull 33"); IN­ K ra ft S y ste m s...... 71, 72, 73 WANTED . . Back issues of 'Model Builder', TERNATIONAL STAR BOAT (AMYA 45 Kustom Kraftsmanship ...... 92 Sept/Oct 1971, September, October, and Class). S.A.S.E. to D.L. Mainwaring, Heri­ Leisure Electronics ...... 87 December 1972. John Garret, 1834 Kinglet tage Marine Models, 36 Hawthorne Avenue, Leisure P ro d u c ts ...... 85 Court, Costa Mesa, California 92626. Needham, Mass. 02192. M icro M o d e l...... 65 Marine Specialties...... 83 WANTED . . Plans for large Delta or straight Model Builder/Pana-Vise Contest...... 2 OKIE BIRD . . 1/2A contest F/F. Wing area flying wings, U-control type. Information on M odel B uilder P ro d u c ts ...... 3rd Cover 286. Kits $7.95 each. Add 10% for postage. how to design wing ribs. Earle A. Robinson, Model Racing Products ...... 89 CLEMCRAFT. P.O. Box 524, Sand Springs, 1970 N.E. 45th St. Ct., Des Moines, Iowa, Oklahoma 74063. 50317. Model Rectifier Corp. (MRC) .. . 4th Cover Sid Morgan (Vintage Plans)...... 92 M & S L td ...... 85 And there are many Scale accessories and you've got it. For example, at Nelson Model Products ...... 81 available (interior kits, decals that look 2 inch scale, or 1/6 size, a 300 mph P ana-V ise...... 78 good, realistic wheels, retract gears) for P-51 Mustang should fly at 50 mph. John Pond O.T. Plans Service ...... 92 the Scale builder to use to advantage. At 3 inch scale, or 1 /4 size, an 80 mph Probar Design ...... 83 P rocto r E n te rp ris e s ...... 76 Look at a Lou Proctor catalog some­ Gipsy Moth should cruise at 20 (mine R E M C O ...... 82 time; all kinds o f really neat Scale items. did). R /N M o d e ls ...... 67 Several sizes of turnbuckles, spoke ONE GRAND SAM! R ocket C ity S p e c ia ltie s ...... 91 wheels, instruments that look like in­ Just received word from Joe Beshar, Satellite C ity ...... 67, 77 struments, rigging cable, strut fittings, President o f the Society o f Antique S co tt R esearch...... 82 and a bunch more. Without the R/C in­ Modelers, that he just received word Shamrock Competition Im ports ...... 86 dustry, there would be no Proctor ac­ from Sec.-Treasurer Tim Banaszak, that Sig M fg . C o...... 96 cessories at all, let alone being able to SAM membership has now passed the Sonic-Tronics ...... 78 go down to a well-stocked hobby shop 1,000 mark! S outh ern R /C P ro d u c ts ...... 91 and buying them right o ff the wall. Congratulations, SAM, and we’re Special E d itio n P la n s ...... 70 There is no need to be a frustrated S terling M o d e ls ...... 68, 69 proud to have SAM No. 1, “ Daddy Superior Aircraft Materials ...... 76 Scale nut, just because you fly C/L. Warbucks” himself, as a member of our Su-Pr-Line Products ...... 90 Truck on down to the hobby shop, pick writing staff. Tern A e r o ...... 87 out an R/C kit that turns you on, and WELL, SOME NYLON . . . Toledo Exposition ...... 70 convert it to C/L. · In the January F/F column, we Tyro Model & S u p p ly ...... 89 inserted a comment about our experience V L P ro d u c ts ...... 61 Workbench .... Continued from page 6 with nylon as a covering material, back Victor Model Products ...... 84 in the late 50’s. The comment related V o rte x M odel E n g in e e rin g ...... 85 This will help judges to properly evaluate to Bob Stalick mentioning that modeler Peter W estburg ...... ·...... 74 realism of flight. An official rule change W illiam s B ro th e rs ...... 79 Ray Chalker covered his Starduster 900 at the December 1975 FAI meeting was J. L. Wittman Co...... 76 with psychedelic nylon material. responsible for this, and we’re happy to Ray sent us a note, enclosing a see that it’s taking effect immediately. sample o f the material (wild colors!), and the dihedral joint, with one piece o f the Let’s hope AMA rules will follow suit. pointed out that this nylon wasn’t like material! He says it stays somewhat Incidentally, some pretty wild the stuff we had both tried some years elastic, like Monokote; and does not formulas have been put forth on how ago. The “ new” nylon weighs about add significant rigidity to the structure. to calculate scale speed. Actually, it ’s 3/4 oz. per square yard, and takes less A t a buck-fifty a yard, it sure sounds very simple. First, change inch-to-the- dope than silk. Water has no noticeable worth trying. Oh yes . . . plain colors foot scale to direct ratio, i.e., 2 inches effect, before or after doping. It goes on are available. to the foot is 1/6 o f full size, 3 inches easily, and because of its different weave, GLOW DRIVER PUZZLE is 1/4. Then, just m ultiply the actual Ray was able to cover the top and One way to find out how popular a speed in mph by the fractional ratios bottom o f one panel, without cutting at construction article may be is to publish

MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 93 No. 12751 CLIPPER AMERICANUS $4.00 STICK 'EM PATTERNS FULL-SIZE PLANS Composite scale R/C model of modern jet Complete sets of pressure sensitive patterns SERVICE airliner. Span 48", .09 eng. By Art Hall. provide "printed wood". . . on your stock . . fo r selected M O D E L B U IL D E R plans. Press (with instructions) No. 12752 FOUND $1.50 all patterns for ribs, bulkheads, tips, etc., on Scale rubber powered seaplane of Canad­ proper thickness sheet balsa or plywood, ian design. Span 26". By Walt Mooney. and cut 'em out! No tracing, no transferring, No. 3761 SEASQUARE S5.00 no plans tearing, no inaccuracies. Just like A .19 powered flying boat for 3-channel No. 12753 SOLIDIFLIER $2.00 All-balsa A/1 Nordic with ribless Jedelsky making up your own kit with printed wood. radio. Span is 50". By George Wilson. wing. Span 47". By George Perryman. "Stick 'em Pattern" numbers correspond to No. 3762 FLIP S1.00 plan numbers. Order with plans and they'll Easy-to-construct, all balsa 1/2A sport/ No. 1275-0.T. THE PIONEER $4.00 be mailed together . . 3rd Class. Add 504 stunt control liner. By Dick Sarpolus. Earliest gas jo b by Ben Shereshaw. Para­ per set to mail patterns 1st Class. sol. 80" plug-in wing. By Phil Bernhardt. CALIFORNIA RESIDENTS ADD 6% TAX. No. 3763 ORCA $4.00 No. 775-0.T.SP BOMBSHELL $3.25 No. 11751 NAVY FLYING BOAT S6.00 Hot FAI power model with all gadgets. No. 575-O.T.SP MERCURY $3.25 "Composite" scale R/C flying boat bi­ Sheet covered surfaces. Larry Sicuranza. No. 11743 SP "C -Q U E L L " $3 .95 plane, 6 ft. span, 40-61. George Clapp. No. 376-O.T. A.T. TRAINER $1.50 No. 1174-O.T. SP LANZO STICK $1.95 Sport rubber model from 1936 Air Trails. No. 11752 "TWIRP" S0.75 No. 91074-O.T.SP 8UHL PUP $4.95 Beginner's fuselage rubber powered ship. No. 8741SP WOODY PUSHER $1.95 Good flier, 30" span. Chuck Blackburn. Teaches stick 'n' tissue. By Dave Gibson. No. 874 O.T.SP POWERHOUSE $3.95 No. 7741SP CURTISS A/12 SHRIKE $3.95 No. 2761 DRAGONFLY $4.00 No. 11753 "LUNAR TIC" $3.00 No. 774-O.T.SP OUT Ό SIGHT $2.45 R/C funship, looks like giant rubber stick Classic-looking, high performance Half-A No. 6741SP TRIXTER BEAM $2.95 model. Superb trainer. By Tex Newman. free flight. Easy to build. Harry Murphy. No. 674-0.T.SP RED ZEPHYR $3.95 No. 12711SP CURTISS WRIGHT Jr. $3.95 No. 2762 "KILLER" SAUCER $1.50 No. 1175-0.T. FOO 2-U-2 $2.50 No. 574 O.T.SP T O COUPE $2.95 A pre-Zipper design by Dick Obarski, re­ For C/L combat, or just attracting atten­ No. 11731SP BIG JOHN the FIRST $5.95 tion. 22” diameter. By Howard Evanson. duced to .020 Replica, by Ron Sharpton. No. 10751 THE LITTLE ONE S4.00 No. 2763 AMERICAN "EAGLET" $3.50 No. 9752 FIREDRAKE $3.00 Economy size. .40 powered pattern ship F/F scale 1930 lightplane, for rubber or Half-A free flight featuring fast climb, has rolled ply fuselage. By Dick Sarpolus. electric power,48" span. By Tom Laurie. flat glide, penetration. Larry Sicuranza. No. 276-O.T. "LONG CABIN" $3.50 No. 10752 MISTER MULLIGAN $4.50 G ood loo kin g , stable cabin gas m odel o f Jumbo scale rubber model of famous Ben Howard racer, spans 56". Tom Houle. the 1937 era. Span 78". Phil Bernhardt. Price includes 3rd Class postage and reprint of building instructions (if any). Add 454 No. 1761 PATTERN SPITFIRE $4.00 No. 10753 SUPER PUP $2.50 PER PLAN for 1st Class postage. Add 504 Scale-like .61 powered pattern ship flown Profile C/L stunt ship for .29 to .36 pow­ for overseas orders (except APO's). at 1975 World Champs. By Tore Paulsen. er, 42" span. Easy-built. Mike Parenteau. Send self-addressed, stamped business size No. 1075 O.T. SKYLARK $3.50 envelope for free copy of complete plans list. No. 1762 TEXAN 750 $4.50 Pleasing Class A/B Louis Garami design. CALIFORNIA RESIDENTS ADD 6% TAX. Popular Class B-C free flight, modified for Shoulder wing, 50" span. Phil Bernhardt. today's engines/rules. Jim Scarborough. S EN D TO: No. 9751 BABY ALBATROSS $8.00 MODEL BUILDER PLANS SERVICE No. 176-O.T. KORDA WAKEFIELD $2.00 Exact R/C scale model of famous Bowlus The classic of all rubber powered comp­ 1105 SPURGEON, BOX 4336, sailplane. Span 122". Col. Bob Thacker. etition free flights. By Phil Bernhardt. SANTA ANA, CALIFORNIA 92702

it with a few critical errors. If you get SIG BOND & FOAM will have three classes o f pattern, plus no reaction, you can write o ff the While on the subject o f corrections, stand-off scale. All MAAC and AMA article as a dud. As for Brian Ellis’ Glow an error in our January R/C Soaring members are cordially welcomed. The Driver in the January ‘76 issue of MB, column, relating to foam wing con­ CD is Jack Mertes, 44 Oregon Rd., Sault every modeler in the country must be struction, earned us a letter from Claude Ste. Marie, Ontario, Canada. His phone building one! McCullough, Product Engineer for Sig is (705) 254-3388. Pre-registration Within a week after its publication, Manufacturing Co. In part, Claude says: would be appreciated. three errors made themselves evident; "In listing model cements not to be TOP FLITE FACTS two in the wiring diagram on page 42, used on foam wings, Sig Bond was one Rumors can sometimes gel pretty and one in the schematic on page 41. of the examples given. Sig Bond is an wild if allowed to go unchallenged, so aliphatic resin glue and can be used on after hearing 3 or 4 ‘‘positive’’ and very In the schematic drawing, resistor foam without problems. We recommend different tales about Top Flite, we R-8 is shown as 10,000 (1 OK) ohms, its use in all of our foam wing kits for sought out the correct story from Mike when it should be 10 ohms . . . as gluing on the leading edge, trailing edge, Schlesinger, who in partnership with correctly stated in the parts list. On the and tip blocks. Sid Axelrod, has pretty well covered wiring diagram, the identities o f resistors model aviation in recent years. . . ahem. "I expect you were thinking of our R-4 and R-5 have been transposed. Sid and Mike closed an agreement model cement, Sig-Ment, which will eat Also, a wire lead should be shown from in December 1975 with Wm. C. Nickels, up foam! Incidentally, Sig-Ment has the emitter (E) of transistor X-3 to a head of Replogle Globes, Inc., of recently been improved and now is common ground. In this diagram, it Chicago, for the total purchase of Top stronger and works better in gluing ABS went to the left end o f the upper 10 Flite Models, Inc. Replogle is a major plastic than did our previous formula.” watt, 1 ohm resistor R-l 1. In the right manufacturer o f the familiar geographi­ hand photograph on page 41, showing BULI____ ETIN BOARD cal globes seen in school classrooms, the under side o f the perf board, this is Nino Campana, Canada’s bone­ libraries, and the show windows of the long wire lead on the far right side bending radio controller, writes to re­ airline ticket offices. of the board. mind us that the Sault Modelers Radio As in the cases o f World Engines with We’re sorry these errors sneaked Control Club will be holding its Annual Consolidated Foods, and Kraft Systems through, and will check more closely on Upper Great Lakes Model Meet on with Carlyle Rubber, Sid and Mike will some additional electronic construction May 29 and 30, at Sinclair Park Model continue to operate Top Flite Models in articles which Brian is planning for Airport, in Sault Ste. Marie, Ontario, the manner to which we have all become future issues of MB. Watch f o r ’em! Canada. The MAAC sanctioned event accustomed. ·

94 MODEL BUILDER pulse commånder

New antenna mount

Due to its small size, light weight, sir city, and low cost, pulse proportional der-only flying is an ideal way for one Vinyl clad aluminum case. budget who wants to get into R/C o r11 sport flyer who needs a second system] fun flying. Quality stick assembly.

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

Units are wired, tested, and guarantee^ Trim function Complete with airborne nicads and charged Switch guard to prevent accidentalsntal turturnfon.; V

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' : 'Í - V. r * Í ' . BABY $69^5 I10G15) ; ' ••^-Alr'bSrne weight = 2.35 oz. -Recommended for .010 and PeeWée .020 * planes not greater than 3 6 ".span. BABY TWIN $72.95 iif«. ; ...... \ l m»'

^ Please send me your complete catalog. Enclosed is $1.00 which is refunded on my first order. (Add $ .50 for 1st class mail return) ACE R/C. Inc. Name v, Address BOX 511 D HIGGINSVILLE, MO. 64037 057 MARCH 1976 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 95 NOW! MORE SIZES IN SIG BALSA s t i c k s S T IC K S S H E E T S B L O C K S B L O C K S B L O C K S C-GRAIN AAA 36" Length* 48" Length» 3 6 " L e n g th s 3 " L e n g th s 1 2 " L e n g th s 2 4 " L e n g th s 8 -1 2 L B S 1/16 X 1/16 ...... 07 1 /8 « 1 /8 12 1/32 X 2 4 0 1x1 1 X 1 38 7 3 1 /3 2 X 2 45 1/16 X 1/8 08 1 /8 * 1/4 18 1/16 X 2 4 6 1 X 2 20 1/2 X 2 50 1 X 2 1 4 7 1/16 X 2 51 1 /8 . 1 /2 2 6 3/32 X 2 1/16 X 3/16 10 3/32 X 2 51 2 X 2 27 3/4 X 2 6 3 2x2 1 9 3 56 3/16 X 3/16 17 1/8 * 2 1/16 X 1/4 12 1/8 X 2 57 1 X 3 2 7 1 X 2 74 1 X 3 1 9 3 62 3 /1 6 X 1 /2 3 3 2 78 3/16 X 2 .77 1/16 X 3/8 14 3/16 X 2 72 2x3 3 6 11/2 X 2 8 3 2x3 3 /1 6 X 3 /4 1/4 X 2 1/16 X 1/2 17 4 0 1/4 X 2 9 2 3x3 54 2x2 9 7 3 X 3 4 2 0 .97 1 /4 X 1 /4 2 7 1/16 X 3/4 24 3/8 X 2 1 0 0 1/2 X 3 61 1x4 2 4 2 3/8 X 2 1 05 1/16 X I 1 /4 X 1 /2 3 5 3/4 X 3 78 2x4 3 78 1/32 X 3 59 28 1/32 X 3 5 5 B L O C K S 1 /4 X 3 /4 4 6 9 7 3x4 5 54 1/16 X 3 65 3/32x3/32 1:9 1/20 X 3 58 6 " L e n g th s 1 X 3 3/32 X 1/8 ...... 5/16 X 5/16 3 5 1 X 6 3 70 3/32 X 3 77 10 1/16 X 3 6 0 1 X 1 21 11/2x3 1 16 3 / 8 X 3 /8 44 2 X 3 2x6 5 54 1/8 X 3 89 3/32 X 3/16 10 3/32 X 3 7 2 1 /2 X 2 2 6 1 3 9 3 /8 X 1 /2 5 0 8 4 3 X 6 8 20 3/16 X 3 1 10 3/32 X 1/4 12 1 / 8 x 3 3 /4 X 2 32 3x3 2 10 3 /8 X 3 /4 6 5 1/4 X 3 1 21 3/32 X 3/8 15 5/32 X 3 9 5 3 7 1/2 x 4 9 7 PLANKS 1 /2 X 1 /2 58 1 X 2 3/8 X 3 1.55 3/32 X 1/2 19 3/16 X 3 1 0 5 3/4 i 1 /2 * 3 /4 8 0 1-1/2 X ; 4 3 VH-VERY HARD 1 X 4 3/32 X 3/4 25 1/4 X 3 t 16 2 x 2 50 1 2 2 l x l 1 0 5 1 /1 6 X 3 6 5 3/32 X 1 32 5/16 X 3 1 3 5 1 /2 X 3 34 1 -1 /2 X 4 1 56 1 /2 X 2 1 4 5 SH EETS 2 x 4 3 /3 2 X 3 77 1/8 X 1/8 10 3/8 X 3 1 5 0 3 /4 X 3 4 2 1 8 8 3 /4 X 2 t 8 5 3 x 4 1 /8 X 3 8 9 1/8 X 3/16 12 18" Lengths 1/32 X 4 8 9 1 x 3 ___ 51 2 78 1 X 2 2 16 3 /1 6 X 3 1 10 1/8 i 1/4 15 1/16 X 4 9 6 1 -1 /2 X 3 5 9 1 /2 X 6 1 34 1 -1 /2 X 2 2 4 7 1/32 X 2 ...... 20 1 /4 X 3 1 21 1/8 X 5/16 16 3/32 X 4 1.10 2 X 3 68 3 /4 X 6 1 56 2 X 2 2 76 1/16 X 2 ------23 3 / 8 x 3 1/8 X 3/8 18 1.2 8 1 a 6 1 8 4 1 / 2 x 3 ...... 1 74 1 55 3/32 X 2 ...... 25 1/8 X 4 3x3 1 0 5 1 -1 /2 X 6 2 3 7 3 /4 X 3 CONTEST BALSA 1/8 X 1/2 21 3/16 X 4 1.42 1 /2 X 4 50 2 2 6 1/8 X 2 ...... 28 4 6 Lb Stock 1/8 X 3/4 30 1/4 X 4 1 68 3 /4 X 4 57 2 x 6 2 77 1 x 3 2 79 3/16 X 2 - ...... 36 V o ry L ig h t 1/8 X 1 3 5 3/8 X 4 2 15 1 X 4 3 X 6 4 10 1 -1 /2 X 3 3 4 2 1/4 X 2 - ...... •ir. 63 1/32 X 3 3/16 X 3/16 14 1/16 X 6 l 76 2x3 4 10 65 3/8 X 2 ------50 1 1 / 2 X 4 8 0 B L O C K S 3x3 6 20 1/16 X 3 70 3/16 X 1/4 17 27 3/32 X 6 1 9 5 2 x 4 ..... 9 7 1/32 X 3 ...... — 1 8 " L e n g th s 1/2 X 4 289 3/32 X 3 82 3/16 X 3/8 19 1/8 X 6 2 15 3 X 4 ..... 1 41 1/20 X 3 — — 29 3/4 X 4 3 30 1/8 X 3 94 3/16 X 1/2 24 3/16 X 6 2 .3 5 1/2 X 6 71 1 X 1 .53 1/16 X 3 ...... — 30 1 X 4 3 57 3/16 X 3 115 3/16 X 3/4 32 1/4 X 6 2 8 5 3 /4 X 6 8 3 1 X 2 1 11 3/32 X 3 - ...... 36 1-1/2 i 4 4 62 1/4 X 3 1 26 3/16 X 1 38 3/8 X 6 3 3 5 1 X 6 9 7 2x2 1.37 1/8 X 3 ...... - 42 3/8 X 3 1 60 1/4 X 1/4 21 1 X 3 1.37 2x4 5 57 5/32 X 3 ------47 4 8 AAA SHEETS 1 1 / 2 X 6 1 21 2 X 3 3x4 8 35 3 6 " B A LS A 1/4 X 3/8 25 2x6 1 3 6 2 10 3/16 i 3 ...... B2 1/32 X 3 76 1/2 X 6 3 94 1/4 X 1/2 28 3x6 2 10 3 x 3 3 15 TRIANGULAR CUT 1/4 X 3 58 1/16 X 3 81 3/4 X 6 4 62 1/4 X 3/4 ...... 39 1 X 4 1 79 1/4 X 1/4 28 5/16 X 3 ...... 67 3/32 X 3 ------9 6 1/4 X 1 36" TAPERED 2 x 4 2 84 1 X 6 5 52 3/8 X 3/8 33 3/8 X 3 ...... - 75 1/8 x3 1 10 TRAILING EDGE 1-1/2 X 6 6 93 5/16 X 5/16 24 .... 3 x 4 4 20 1/2 X 1/2 41 1/32 X 4 ...... 44 3/16 X 3 1 34 1/8 X 1/2 28 2x6 8 15 x 5/16 X 3/8 32 1 X 6 2 79 3/4 3/4 - 52 1/16 X 4 ____.._ 48 1/4 X 3 1 58 3/16 X 3/4 36 2 x 6 4 10 3 X 6 12 35 1 x 1 69 5/16 X 1/2 37 4 ...... 55 3/32 X 3/8 X 3 2.00 1/4 X 1 46 3x6 6.15 ROUNDED EDGE 5/16 X 5/8 46 BULK BALSA -3"x36" 1/8 X 4 ------64 1/16 X 4 1 20 5/16 X 1-1/4 57 A IL E R O N & 5/16 X 1 54 3/16 X 4 ____.... 71 3/32 X 4 1.35 3/8 k 1-1/2 65 Not Stamped or Sorted ELEVATOR STOCK 3/8 X 3/8 37 1/4 X 4 ...... 84 1/8 X 4 1 55 Sold Only in Standard Packs 1 /4 X 1 63 3/8 X 1/2 42 LEADING EDGE ^idnudru r-ac*s n Π l 1 3/8 X 4 07 3/16 X 4 1 78 AIRFOILED 3/8 X 1 74 3/8 X 3/4 4fl S H E E T S 3 6 " Price Shown List Per S heet 1/4 X 4 2 10 S H A P E D S H E E T S 1/4 X 2 86 1/32 X 3 (50) 4 2 3/8 X 1 99 1 /2 X 3 /8 4 9 3/8 X 2 97 3/8 X 4 2 70 3/16x3x36 112 1/2 X 1/2 47 ODDS 4 ENDS 3 /4 X 5 /8 74 1/16 X 3 (50) 4 5 1/16 X 6 2 22 TAPERED CUT 63 1/4 X 3 X 36 l 27 3/32 X 3 (35) 53 1/2 X 3/4 PACKAGE OF BALSA 3/32 X 6 2 35 1 X 3 /4 1 0 0 3 6 "L e n g th s 79 1/4 X 4 X 36 1 72 1/8 X 3 (25) 6 2 1/2 X 1 ...... Package 1 25 1/8 X 6 2 58 Tapered to 1/16 Edge 3/16 X 3 (20) 76 5/8 X 5/8 ...... 58 3/16 X 6 2 92 1/4 X 3 1.21 BAGS OF BALSA 1/4 X 3 (20) 9 4 5/8 X 1 84 1/4 X 6 3 47 1 / 4 x4 1 63 Bags of Balsa 1.69 3/8 X 3 (15) 1 16 3/4 X 3/4 ____ 79 3/8 X 6 400 3/4 X 1 .91 HARDWOOD DOWELS SIG AIRCRAFT PLYWOOD SELECTED WHITE BIRCH TOUGH BIRCH PLYWOOD LAMINATED WITH WATERPROOF GLUE

STRONG, STRAIGHT AND SMOOTH 1/64 PLYWOOD WINGSKINS THREE-PLY FIVE-PLY 1/64 X 12 X 12 1.20 1/32 X 6 X 12 ...... 60 3/32 X 6 X 12 ...... 80 1/16 X 6 ...... 01 1/64 X 12 X 24 ...... 2 40 1/32 X 12 X 12 1.20 3/32 X 12 X 12 ...... 1 60 1/8 X 12 05 1/64 X 12 X 48 4 80 1/32 X 12 X 24 ...... 2 40 3/32 X 12 X 24 ...... 3.20 5/32 X 12 06 3/16 X 36 .15 1/32 X 12 X 4β 4 80 3/32 * 12 X 48 6 40 3/16 X 12 ...... 1/64 X 24 X 48 9 60 1/16 X 6 X 12 ...... 70 1/8 X 6 X 12 85 1/4 X 12 ...... SPECIAL 3-PLY PLYWOOD 1/16 X 12 X 12 ...... 1.40 1/8 X 12 X 12 1.70 5/16 X 12 ...... 09 ...... 23 1/16 * 12 X 24 2.80 1/8 X 12 X 24 ...... 3.40 3/8 X 12 12 1/8 X 6 X 12 ...... 40 1/16 X 12 X 48 ...... 5 40 1/8 X 12 X 48 6.80 7/16 X 12 ...... 13 1/8 X 12 X 12 ...... 80 3/16 X 6 X 12 .85 1/2 X 12 ...... 14 1/8 X 12 X 24 1 60 1/8 X 12 X 48 3 20 LITE-PLY PLYWOOD 3/16 X 12 X 12 . 1.70 5/8 X 12 ...... 3/4 X 36 ...... 65 3/16 X 12 X 2 4 . 3.40 3/4 X 12 ...... 1/8 X 12 X 12 ...... 65 3/16 X 12 X 48 . 6.80 1/8 X 12 X 24 1.30 1/4 X 6 X 12 ...... 85 1/8 X 12 X 36 ...... 1 95 1/4 X 12 X 12 ...... 1.70 1/8 X 12 X 48 ...... 2 60 SIG'S LATEST CATALOG! 1/4 X 12 X 24 3.40 1/4 X 12 X 48 6.80 "The Modeler’s W ishbook” Every workshop needs our latest Catalog. The complete HARD MAPLE MOTOR MOUNTS line of Sig kits and supplies is shown plus practically all other lines available. For sale at your local hobby 3/8x3/8x12 ...... 30 3/8 X 3/4 X 12 ...... 45 shop or send S I.50 for your postpaid copy. TO ORDER 3/8 X 1/2 X 1 2 ...... 35 1/2 X 5/8 X 24 ...... 85 KITS AND SUPPLIES: See Your Dealer First! If he can­ not supply you, order direct. Add $1.00 postage and handling in the U.S., S I.50 in Canada. Minimum order is $1.00. DO NOT send cash, send check, draft or money order. No C.O.D. Prices subject to change without no­ tice. Double check to be sure you have included your CATALOG 34 name, address and zip code. SIG MANUFACTURING CO...... Montezuma, la. 50171

96 MODEL BUILDER IN THE BEST CIRCLES, IT’S tibei* skiver

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 You don’t need a flying field to enjoy R/C! Mošt solid terrain or even indoors is a place to operate the new electric motor power­ ed MRC/TAMIYA tank model. Here’s the ideal vehicle to get the adult members of your family involved in sharing, understanding, enjoying and supporting your R/C habit. MRC-TAMIYA's 1/16 Scale R/C Sherman M-4 tank kit is engineered and tooled with a thoroughness that marks a break­ through in its field. Hundreds of die cast and stamped metal parts are combined with precision modeled nylon and ABS plastic using the most suitable material for each component. Building the tank is made simpler by a complete descriptive 8 page manual containing about 50 photographs, exploded views and drawings. An additional 18 page Manual takes the modeler through prin­ Dual electric motors ciples of radio control, real and model tank operation and trouble­ power a fully assembled shooting. Construction requires adult modeling skill but many com­ gear system. Servos plex subassemblies like the motors and driving gears come operate forward — preassembled. MRC’s 1/16 Scále R/C Sherman M-4 is a neutral — reverse and sophisticated piece of engineering that provides a running also control dual clutch mechanism which di­ challenge for R/C expert or novice. It’s a change of pace rects power to each that can add hours of pleasure and a new dimen­ metal tread. sion to your hobby just for the fun of it... RT 1601 Tank Kit—Less than $110. Complete with Digital Proportional R/C—Less than $250. MODEL RECTIFIER CORPORATION Take 2500 WOODBRIDGE AVENUE o r An R C EDISON, NEW JERSEY 08817 fust for the fun