, Μ π η π SEPTEMBER 197Γ» ohniti b, luimfioi 4! MORROW HéRie prodnrtl! lie Here we to sell §enice lods«}·

DECEMBER 1985 ' i i · i I I •••"HUM

Since we started in 1962, over 50 radio control manufacturers have come and gone. Long term, radio control equipment is no better than the service backing it. Whether you own our first 1964 KP-4 or our latest Signature Series, you can be sure of service continuity. This is another important reason for selecting Kraft.

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SCALE R/C NEW - TUNA CLIPPER TC-37 Scale Model of the 220' Purse Seiner, built by Campbell Industries, San Diego. 37” long. 6-1/2" beam. Plywood POWERBOATS construction with mahogany planking. Complete with deck hardware A beautiful shelf model, yet rugged for R/C use with single or dual Dumas-Pittman motors. Lots of room for FROM DUMAS radio and specialty gear.

NEW - THE LITTLE SHELLY FOSS TU-24 A 24" scale kit of this popular tug. Lots of room for R/C gear and electric motor power. Plywood construction. Deck hard­ ware included. Also available in a 36" model. . . and as a 45" fiberglass hull model with die cut wood deck and super structure .. for electric or steam power.

TROJAN CRUISER TR-31 Kit of 3Γ Trojan cabin cruiser. 1" = Γ scale Rugged ply­ wood construction for gas or electric power. All deck hardware included. Excellent for R/C.

Take your choice, these precisely scaled kits are built for R/C boating, free running or shelf display. Each an exacting replica of a popular ocean going prototype. Pretty enough to put on display, sturdy enough to run, they're just a few examples illustrating why Dumas’ scale and semi-scale model kits lead in helping you get the most out of your hobby. Now available: Pre-packaged hard­ ware kits with everything you need for running. A hardware kit for every model. dumas Props available. See Your Local Dealer. If He Can't Help You Write Us. COAST GUARD LIFEBOAT S-200 See your nobby dealer or send boats 50« lor our comoleie calaloa 33" kit for exacting modeler. Includes deck hardware. Balsa Dumas Products, Inc. construction. . . display it, run free, or R/C with Dumas- 790 South Park Avenue Pittman electric power. One of the most popular scale models Tucson. Arizona 85719 ever kitted. T h e N91

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MODEL AIRCRAFT INC., 1424 E. BORCHARD AVE., SANTA ANA, CALIF. 92705 TELEPHONE 714-8 35-77 88 SEPTEMBER 1975 1 MODEL& BUILDER presents the MASTER MODEL BUILDER Send all entries to: of the month EL BUILDER/PANA-VISE CONTEST 1105 Spurgeon St., Box 4336, CONTEST I 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 w ill be judged purely on the basis of photo­ graphs and drawings supplied by the builder of the model. Emphasis in judging will 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 for published designs will be at our regular rates. Any prizes awarded do not represent an agreement to publish any design. 6. Entries w ill 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 dosing. Our first winner of the MODEL BUILDER/Pana-Vise monthly contest is MURRAY V. CHARLES, 14 Cool- idge St., Soneham, Mass. 02184. The model is an R/C, fiberglass replica of his own full size X-246 IMP! Scale of the model is 1-1/2 inch to the foot. The real boat is a deep-V powered by a Chrysler 340 Super Bee with a Volvo 270 outdrive. The model is powered by a water and air cooled O.S. Max 30, with a straight inboard drive train. Control is by Kraft radio. The finish is hand rubbed lacquer, orange hull and ivory top and bottom. Upholstery is hand sewn, rolled and pleated in orange vinyl. To duplicate the orange car­ pet which is flecked with light green, Murray wove or­ ange and green polyester yarn into fiberglass cloth, then soaked it in resin, so it all looks real, but is fuel proof. 2 MODEL BUILDER SEPTEMBER

MODEL 0 1975 BUILDER volume 5, number 45

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

STAFF CONTENTS

EDITOR CONSTRUCTION Wm. C. Northrop, Jr. WORKBENCH, Bill Northrop ...... 4 GENERAL MANAGER Anita Northrop OVER THE COUNTER, B ill N o r th r o p ...... 5 EDITORIAL ASSISTANT REMOTELY SPEAKING, B ill N o r th r o p ...... 14 Le Gray ASST. GEN. MANAGER R/C SOARING, Taylor Collins ...... 17 Dawn Garrott CHOPPER CHATTER, J o h n T u c k e r ...... 20 ART DIRECTOR Paul Plecan FOR MS. ONLY, C har R o h r in g ...... 24 SECRETARY STRICTLY SAIL, R od C a r r ...... 25 L. Gordon

SUBSCRIPTION MANAGER PLUG SPARKS, Jo h n P o n d ...... 28 A. Valcarsel SPECIAL 1975 NATIONALS REPORT, Bill Northrop ...... 32

CONTRIBUTORS CONTROL LINE, Dan R u t h e r f o r d ...... 34 Rod Carr 1975 PARCEL POST PROXY PEANUT RESULTS...... 37 Chuck Hallum HOWTO FLY A PEANUT, Steven W a lto n ...... 38 Bill Hannan Walt Mooney F/F SCALE, F ern a n do R a m o s ...... 40

John Pond HANNAN'S HANGAR, B ill H a n n a n ...... 42 Fernando Ramos FREE FLIGHT, B ob S t a lic k ...... 4 b Dan Rutherford Bob Stalick R/C AUTO NEWS, Chuck Hallum ...... 54 John Tucker SCALE VIEWS

DOUGLAS XO-36/XB-7 BOMBER, Peter W e s tb u rg ...... 23 ADVERTISING REPRESENTATIVES SOKOL Μ 1 D, Modelar Magazine ...... 3 6 WEST: Bob Upton, 20626 Clarendon Ave. Woodland Hills, California 91364 BLECHA, Modelar Magazine ...... 56 (213) 884-2294 EAST: Walt Moucha, 38 Coppersmith Rd., FEATURES Levittown, New York 11756 (516) 796-4898 BOWLUS BABY ALBATROSS, Col. Bob Thacker ...... 8 Subscriptions S12.50 per year, S23.00 for tw o years. Single copies SI .25. Add $2.00 PETE BOWERS' "PURSUITEER” O.T., P h il B e r n h a r d t...... 30 for postage per year outside of U.S. (Except APO). Add 75 cents for Canada and Mexico. PEANUT JODEL D.11, Rex B. P o w e ll...... 43 Copyright 1975 The MODEL BUILDER. "FIREDRAKE” , HALF-A F/F, L a rry S ic u ra n z a ...... 51 All rights reserved. Reproduction without permission prohibited. Published monthly by MODEL BUILDER Magazine, 1105 Spurgeon, Box 4336, Santa Ana, Calif. 92702. Phone (714) 547-3963. Cover: The epoxy-covered rocks (When modelers need to make quick repairs, they'll Change o f address notices must be received use whatever is at hand!) of the La Paz Road R/C slope soaring site in Laguna Niguel, one month before date of issue that new California, provide a foreboding background for the first test flight of Col. Bob Thacker's address takes effect. Send old address w ith beautiful Baby Albatross. Bob checks the controls as MB's editor prepares to heave the new; old label preferred. Post O ffice w ill not eight pound model into a light wind. A complete construction article for the Bowlus forward copies unless you pay extra postage. begins on page 8 of this issue. Photo by Taylor Collins. Duplicate issues cannot be sent. Second Class postage paid at Santa Ana, Ca.

SEPTEMBER 1975 The first few issues of MB carried a photo of the Editor/Publisher and the General Manager, so it seemed appropriate that we should appear again on the fourth anniversary of the magazine. The photo was taken by Jerry Doyle, during the outdoor banquet following the B.I.R.D. Club Vacation Fun Fly. Joe Zingali, B.I.R.D. president, did the darkroom work.

• FOUR YEARS AGO, Jack Stafford “ Bill, this is Jack Stafford ... You’re that with this issue, MODEL BUILDER was the first person to respond to our NUTS!” has completed four years, and is starting announcement that we were going to Looking back, we wonder who really on its fifth . We wish to thank all of our start a model magazine. The phone con­ took first prize . . . before the conversa­ readers and advertisers for the moral and versation went like this: tion ended, Jack took out an ad in the financial support that has helped us over “ Hello.'’ first issue . . . and has been with us ever some rough times. "Hello. Is this Bill Northrop?” since. We especially want to thank those .. Yup." Anyhow, what we’re trying to say is, Continued on page 60

I'M SORRY BOYS,THAT'S JUST THE WAY IT TURNED O U T /

4 MODEL BUILDER OVER THE COUNTER

• Peck Polymers, P.O. Box 2498, La winch parachutes to its line of soaring braided for extra strength. In the near Mesa, Calif. 92041, has come to the accessories. These hand made parachutes future, the White Co. will have a club rescue of rubber modelers with a new are made of nearly indestructible ‘rip- winch kit available, which will contain series of plastic props ranging from 4-3/4 stop’ nylon (the same material that high two parachutes, and two return line to 10 inches in diameter. They are mold­ quality sleeping bags and back-packers flags. Incidentally, the parachutes are ed o f rugged plastic, with a free-wheeling tents are made of). )im White will make specifically designed for winch use. Their cam in each hub. The smaller sizes are them in your choice o f color, and then smaller size allows them to be hauled molded in a satin-finish brown tone, decorate them (in permanent ink) with down to the turnaround pulley under making them ideal for use on Peanut the L.S.F. Emblem, N.S.S. emblem, your full power when launching in crosswind scale and other small scale models. L.S.F. number, your name, or whatever conditions. * * * else you may desire. The shroud lines * * * The White Co., 19372 Worchester are high quality nylon line, sewn up Live steam power can now be a prac­ Lane, Huntington Beach, Calif. 92646, through the top o f the chute canopy. tical reality for your boat! Polk’s Model has added customized high-start and The attach point for the winch line is Craft Hobbies, 346 Bergen Ave., Jersey

Plastic rubber-powered props by Peck-Polymers. Single cylinder live steam engine from Polk's.

Two cylinder vertical steam engine from Polk's. One o f several boilers fo r live steam engines from Polk's.

SEPTEMBER 1975 5 Electric powered conversion of Jerobee R/C race car by Leisure Updated AVATAR glider by M&S Limited. Electronics.

City, New Jersey 07304, is importing a eliminates the mess and headache of comes in a brown manila envelope, which line of single and double cylinder steam leaking lead acid batteries. Since the is printed on the outside with a repro­ engines. The single cylinder engines are cases are completely sealed, there is no duction o f the plan. available in either horizontal or vertical need (or way) to replenish the liquid * * * configuration. The twin cylinder engine level. The Gel /Cell batteries can be re­ Dave Linstrum’s F.A.I. award win­ is available in the horizontal version on­ charged for over 1000 cycles. Geltronics ning Starstream A/1 towline glider is ly. Polk's also has a line o f boilers, which stocks eleven different styles and sizes being kitted by Midwest Products. The are sold separately, so the modeler can that are adaptable to just about any­ Starstream uses Jedelsky type all sheet tailor the engine/boiler combination to thing. For more information and prices, wing construction, and a sheet balsa suit his boat. They also have live steam write directly to Geltronics. And don’t “ semi-profile” fuselage construction to accessories such as safety valves, regu­ forget to tell them where you heard yield an easy-to-build yet competitive lators, universal joints, oilers, and last about it ... A/1 contest bird. Whatsistrum won the but certainly not least... whistles! For * * * competition set by the C.I.A.M., mod­ more information and a catalogue sheet Did you ever buy peanuts in an enve­ eling committee o f the F.A.I., for this contact Polk’s. And tell ’em MODEL lope? Vintage Aero, 1 The Glen, Tenafly, design, and it is easy to see why. Easy BUILDER sent ya! N.J. 07670, sells them that way. They to build doesn’t necessarily have to mean * * * are offering printwood and plan kits “ flies like a tail heavy water bucket.” Need a battery for your field box? (you gotta supply your own strip wood The Starstream retails for an affordable Need a battery for your boat? For your and hardware) which are recreations of $11.95. electric plane charger? Geltronics, P.O. the Megow kits o f the 30’s. Presently Midwest has also introduced a "sen­ Box 59215, Norwalk, Calif. 90650 has available are the Megow Gulfhawk, Fleet sible motor m ount.” Their new one piece got the battery you need. They distri­ Trainer, Curtiss Swift Pursuit, Spad, and mount (available in four sizes) uses fold­ bute the Globe ‘Gel/CelI ’ rechargeable V-100 Vought Corsair Bipe. The Fleet, ed aluminum and glass filled nylon in batteries which feature a gelled electro­ Swift, and Corsair sell for $1.25. The the right places to produce a strong, and lyte, encased in a sealed housing which Gulfhawk and Spad sell for $1.79. Each lightweight mount that is easy to install.

Mini-Glue Tips, by Applied Design Corporation. The new HGK .15 engine from Japan, through Shamrock Competition Imports.

6 MODEL BUILDER Starstream A/1 towline glider, by Midwest Products.

The nylon mounting blocks are inter­ recoil pull starter, ball bearings, and a changeable, to allow the use o f different built in fuel pump. Like all two cycle engines on the same model . . . or to cut engines, it depends on lubrication from down the cost when changing the mount oil mixed with the gasoline fuel. Total from one model to another. The four weight o f the engine is 4.2 pounds. The sizes will accommodate any engine from manufacturer obviously has confidence .15 to .80. Prices range from $4.25 to in its product. . . the instruction book­ $4.95. Both the engine mounts and the let details the maintenance to be per­ Starstream glider are available from Mid­ formed after 1000 hours of operation. west Products Co., 400 South Indiana The Fox Industrial engine is available St., Hobart, Indiana 46342. for immediate delivery for $ 179.95. * * * * * * Polk’s seems to have gone power mad. Top Flite Models, Inc. 2635 S. Wa­ Not only do they have steam engines, bash Ave., Chicago, Illinois, has added they also have introduced a 1 horse­ five new propellers to its already bounti­ power industrial engine. Aimed at the ful line o f props. Pylon racers pay atten­ helicopter and large boat market, the tion! The new Pylon Racing Speed props Bent aluminum and glass-filled nylon motor H.P. Fox Industrial gas engine features Continued on page 87 mounts by Midwest Products.

Battery Medic, by JR Sales Co. Towline parachute by White Co.

SEPTEMBER 1975 7 By Col. BOB BOWLUS BABY ALBATROSS THACKER One of the best known aircraft of any era, the Baby Albatross has been modeled many times, but we'll bet there has never been a better scale reproduction than the one presented herein, p h o t o s b y t a y l o r c o l l in s

• Co/. Bob Thacker, USAF (Ret.), is a guy who exudes confidence. He walked into MODEL BUILDER'S office one day last winter and announced in no uncer­ tain terms that he was going to build an R/C Baby Bowlus and win scale at the 1975 Soaring Nationals. No doubt it was with the same assurance that he told his A ir Force superiors in 1947 that he was going to overload a P-82 ("Twin Mustang") with enough fuel to fly it, non-stop, from Honolulu across the Pa­ cific and across the USA, and land in New York, to establish 3 world records. In both cases, he proved himself correct. Having dealt with the Col. in other matters, we didn’t question his predic­ tion on the Bowlus, but simply said, "Fine, we’ll do a construction article on it and time it to come out within a few weeks after the SOA R Nats. ” Easier said than done. We’re sure Col. Bob had better plans for his non­ stop hop than he did for the Bowlus... Mission accomplished! Col. Bob Thacker, left, collects first place Scale trophy at the 1975 in fact, most anything would have been Soaring Nationals. CD Dan Pruss congratulates Bob while Linda Porter passes the hardware. better than the mutilated, hole punched,

The practically non-existent dihedral presents no problems, since the model has rudder and aileron controls. By coupling them electronically, the turns come out beautifully coordinated.

8 MODEL BUILDER All of the mahogany planking on the original Bowlus was duplicated by using mahogany-finish· All curved trailing edges are formed from wire, ed Contact paper. Struts are K&S streamline tubing, reinforced with music wire. Stab is all-moving, with horn in the sub-fin.

Taken the day of the first test flights, this photo proves that Bob was fairly pleased with th results. Actually, the only change required was to move the balance point aft a half inch. Ship has over 1400 square inches o f wing area.

Test fitting the basic structure. The tail boom is made from a one One of the most famous profiles in aviation, the epitome of pod-and- inch diameter aluminum tube towel rack. boom construction. Note the huge aileron area. SEPTEMBER 1975 9 FFZSFZy·™*· ,—~*9 ervn->e *■»—-—«. »*£o*y

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glue spattered, hen-scratched bits o f tat­ tered tracing paper that he brought to us when the Baby was completed. Our ace plans delineator, Phil Bernhardt, took one look at the shredded mess, let out a shriek, and started chewing all o f his pencils into fine splinters! Fortunately, Col. Bob also brought along the Bowlus, and it spent the better part o f two months as an honored guest o f MODEL BUILDER's drafting depart­ ment. In fact, Phil was just putting the finishing touches on the plans when the Col. came by to take the Baby to Chi­ cago.

10 MODEL BUILDER FULL SIZE PLANS AVAILABLE - SEE PAGE 88

BOWLUS BABY ALBATROSS

We knew Phil had done a good job on the plans when Col. Bob pronounced his endorsement, "Ch— , Phil, / wish I ’d had these when I built the d— th in g !" The rest o f the introduction is mere routine, in Chicago, the Bowlus Baby Albatross not only acquired the highest scale points, but Col. Bob also managed to tow it up into a nice thermal and scored the highest scale flight points. Everyone stopped what they were doing to watch the Baby fly, and Bob reports that one thing happened that he hadn 't expected... both the takeoff and land-

SEPTEMBER 1975 11 Fuselage planking is applied in small strips due to the compound "There I was, on my back at 5,000 feet, with the rudder jammed in curves involved. Note familiar modeler's equipment .. a Band-Aid! fu ll up . . Watch what you're doing. Bob, the epoxy's setting up! „ ing were accompanied by a huge round was designed for the leisure pursuit of transport, yet is large enough to be very o f applause. flight duration, rather than a mad dash impressive. Except for that, it was all just as from point to point, as the big birds do To begin construction, first gather Col. Bob Thacker had expected. today. Top speed on the Bowlus was the materials that you’ll need. The most Bill Northrop 65 mph. A Gottingen 525 Modified air­ d ifficult thing for me to find was the foil carried its 450 pounds (complete aluminum boom. I miscalculated the Hawley Bowlus was one o f the pre­ with pilot). Huge ailerons, and an all­ diameter initially, and based on the mier glider designers and builders in the flying fin, helped turn the Bowlus’ shal­ wrong measurement, was forced to pay 20’s and 30’s. The Baby Albatross was low dihedral (3°) wing. $22.00 for a piece o f precision aircraft introduced as a homebuilt kit, which The pod was made o f mahogany aluminum tubing. Later, I discovered could be purchased (and paid for) in sheeting which was held to the plywood that 1 inch diameter was correct for ten installments. Bowlus, being not only bulkheads with sheet metal screws. The scale, and found an aluminum towel a clever designer, but a clever business­ wing was of a wooden structure, with rack tube at a plumbing shop for $1.80. man, saw to it that the most critical mahogany leading edge sheeting, and (Anyone who needs some 1-1/16 inch parts o f the glider, namely the castings wire trailing edges. Tail surfaces were aluminum tubing, please contact m e __ that held the structure together, were a constructed in the same manner as the have I got a deal for YOU!) There is part of the last o f the parts packages. wing. The tail boom was a constant very little balsa involved in the construc­ There was no cheating . . . you had to diameter, 5 inch duraluminum tube. tion. All ribs and bulkheads are plywood. buy the whole shebang to get into the After experimenting with several The spars are spruce, with 1/64 ply air. Approximately 50 were built prior scales, I settled on 2-3/4 inch to the shear webs. I used Sig medium weight to World War II, and there are seventeen foot. This gives me enough wing area fiberglass cloth for covering the pod. still flying today. (1400 sq. in.) to carry the six servos Also, get a roll o f Contact brand maho­ The forty-four foot six inch floater that I felt necessary to control the bird. gany finish vinyl shelf paper. This is the would be no match for the super soarers Wingspan is 122 inches, with an eleven material I used to simulate the scarfed o f today. Its three pound wing loading inch chord. This is a manageable size to mahogany sheeting on the monocoque

Planking almost completed. Radio hatch is cut out after pod has been Close-up of spoiler rigging. Spring tension keeps spoiler retracted, sanded to shape. Real cockpit hatch was too small fo r accessibility. and servo pulls dial cord to extennd the spoiler doors.

12 MODEL BUILDER FULL SIZE PLANS AVAILABLE - SEE PAGE 88

pod and flying surfaces. and shear webs are in place glue down The tail surfaces are built in the same Wing construction is fairly standard, the top spar, making sure that the spar manner, except that 1/64 plywood is except for the plywood ribs. Begin by is seated firm ly in the rib notches. The used. cutting out all o f the ribs. The bottom Nyrod tubing for the spoilers can now The wire trailing edges are held in 1/4 square spruce spar is then pinned be snaked through the holes in the ribs place with epoxy. Vinyl electricians tape down and the root rib is pinned in place. and epoxied at each rib. Glue the 1/4 can be used as a “ m old” to get a “ weld­ Next, glue on the shear web for the first inch square leading edge into the rib ed” appearance on the joints. The tape bay, and then the second rib. By pro­ notches. The 1/32 mahogany veneer is wrapped around the joint after the ceeding towards the tip in this fashion, leading edges can now be glued in place, epoxy is applied. When the epoxy cures, you are guaranteed o f a good fit between after the leading edge has been sanded remove the tape and you should have a the ribs and shear webs. After all ribs to shape. Continued on page 83

Tail surfaces are entirely demountable. These wires hold the upper Gussets are realistic, and also help to keep the outline wire epoxied fin in place. Elevator horn is in the sub-fin. to the stab and rudder ribs. Structure is rugged yet not too heavy.

SEPTEMBER 1975 13 Typical scene when it's a hot summer day at a contest. This one was the Houston Area Annual Pattern Contest held on June 7 and 8, at the Manned Spacecraft Center in Houston. We examined the original photo carefully and can't figure out what they were all looking at.

'REMOTELY SPEAKING...' R/C News, by BILL NORTHROP • This month, we must start our col­ like to acknowledge a phone call from Ranch, Athol, Idaho. umn with an apology. First there is the George Killeen (Kraft Systems techni­ “ just a little news from the North­ Lake Charles Nationals to attend, fo l­ cian for the past 10 years) who indicates west. Now that winter has left (last lowed by the R/C Aerobatic World that he has opened an authorized Kraft week), things are really humming. The Championships in Bern, Switzerland, repair station in Anaheim, California, Spokane Internats was a huge success, where we will be judging (and gathering called "K raft, Orange County.” He has with a lot of really beautiful birds com­ photos and info for a complete report). joined forces with Andy’s Electronic peting in the Sport Biplane Pattern and And in between these two events (about Repair, located at 2817 E. Lincoln Ave., Stand-off Scale events. Some o f them one month apart) we will be house mov­ Anaheim, CA. 92806. Andy’s repairs all doing double duty with great results. ing, as mentioned in our "Workbench” makes o f digital radio systems. This faci­ "The Coeur d’Alene Aeromodelers column. lity will be open on Saturdays during Society had their annual picnic at my It’s just too much, and so we are re­ the summer. The phone number is (714) ranch a couple o f weeks ago. Can’t un­ lying heavily on reports from various 630-5061. derstand why a club with only 10 active sources around the country to fill out NORTHWEST DOINGS members can show up at a picnic with this month’s column. Our Northwest correspondent, Bob 65 people (32 flyers) and yet you men­ Before getting into these reports we’d Petro, reports from Cedar Mountain Sky tion a club contest or fun fly and two

The controversial Rossi .15 w ith Perry carburetor is available from The disassembled Rossi .15 R/C, showing all o f the basic parts. Bob Bill's Miniature Engines fo r S83.95. See ad in this issue. Reuther had 9 perfect heats (landed with engine running) at '75 Nats.

14 MODEL BUILDER Gaggle of sailplanes . . and pilots at the June 21-22 Houston R/C Club Soaring meet (I to r): Tom Williams, Bob (Logictrol) Elliott, John Rimmer. Jim Simpson, Jack Lipscomb, Paul King, Arthur Cayer, Tom Boyette, and Al Dalnoki, seated. All were winners at the contest. show up! Maybe we oughta lay a sneak "A person or organization without typical of the California lifestyle, the contest on ’em at the next picnic! goals is like a traveler w ithout a road planning was set in motion. “ Thanks for the plug on our rally in map, and the effectiveness o f such goal “ A planning committee was formed, your last issue, and using the photos. setting and direction was recently illus- consisting o f twelve club members and The guys up here really get a kick out of strated when the BIRD Club of Carson, their wives. Each was given a specific seeing that someone is willing to recog­ California had their Annual Vacation assignment for which they were respon­ nize that not all the nation’s modelers Fun Fly at their new field, June 28 sible, and everyone contributed ideas to live on the West Coast! We’re not good through July 6. the overall planning process. ... but we’re getting better! Then you “ Mainland participants in the annual “ Social activities began June 29, with West Coasters better watch out.” affair for 74 in Kona Flawaii were so a welcome cocktail party hosted by Hal Best Regards, impressed by the cordial hospitality they and Marilyn Gordon. As it turned out, Bob Petro received, they decided to host the con­ we had an elaborate welcome for about BACK TO BASICS .. . test themselves for 75, so they would 50 o f our own club members, and Rod­ IT’S STRICTLY FOR FUN have a chance to return the gesture of ney Pate from Texas. Hiroshi and family Our first report is by Don Gutridge, their island friends. With the specific arrived from Hawaii on time, but suf­ Public Relations Manager for the well objective in mind of producing a smooth­ fered extreme pressures from the young­ known B.I.R.D. Club (Beginners In running, relaxed, fun contest atmos­ er generation to see Disneyland NOW, so Radio Drones), o f Carson, California. phere, complemented by social activities they were unable to attend (Ah sweet

Big guys build little planes? Yes! Dick Carson, Spokane, Washington, Big guys also build big planes! Gil Horstman, Spokane area, and his and his R/C Tern Aero Super Starduster. TD .020, Ace pulse radio. 9 foot J-3 Cub. Flies realistically without ailerons. Fox .78, EK 3 ch.

SEPTEMBER 1975 15 youth). Other out-of-town guests were victims o f the old work syndrome, and were scheduled to arrive later in the week. “ While the manufacturers tours took placeduring the week, word o f the other social gatherings began to spread, and the lavish appointments provided at the Gordon’s attracted many people to them. By Wednesday, July 2, participation had doubled for the party hosted by Joe and Gene Bridi, which marked the first of four consecutive gatherings. These toy plane pilots sure do a lot of party­ ing. Phew! I wonder what they are con­ suming in their coffee mugs as they spend all those hours in the garage . . . ’building’? “ Thursday morning pattern flying ac­ tivities began at a furious pace, if you are used to viewing things through a Winners at FORKS Club QM races, June 1 (I to r) back row: Fred Johnson, Bob Gademer, Bill slow motion camera . . . flying began Gademer, Bob Penko, Bob Mellen. Front: Billy Johanson, Don Love, Ed Weesner, Ed Nobora. 'Hawaii tim e.’ Judging was provided by the USPJA, and was rated tough but consistent, and that’s just what it is sup­ posed to be. Because o f the FUN nature o f this gathering, some liberties were allowed, but not without considerable discussion with the well disciplined USPJA judges. “ Have you ever seen the look o f dis­ appointment on a flyer’s face when his engine dies just as his craft rotates o ff the runway? Or, have you noticed the look of panic when he has taxied half way to the end o f the strip and gets a flame out? Immediately he grabs his battery or tool box and runs for all he’s worth to restart before the clock runs out. “ 'Hold it John,’ cried the judges, ‘relax, take it easy, this is just a fun contest. Go get your plane and restart at your own pace, you’re not being timed, just have FUN.’ That was how such situations were handled here, and you should have seen the expressions on their faces when the judges told them

Senator "Babe" Schwartz presents trophy to Jnel Ta.ih h . .. : „ _____ to ‘relax.’ They were so aghast that they Summer Fun Fly. June 29. Galveston, Texas. Cub president Dunca“ Atkinson fo o k s o f almost went into shock, but they did relax, and they did have fun, and that’s what it was all about. “ Thursday night’s party was hosted by Bill and Anita Northrop, and our following again increased as the kids enjoyed the swimming pool, and every­ one took part in an outdoor bar-b-que style dinner. “ Pattern flying continued Friday, and about 10 contestants were added who were unable to escape work on Thursday. Everyone seemed to like the special pattern concept originated by CD Betty Stream, where required ma­ neuvers were complemented by electives selected by the contestant. Selections could be altered on every flight, and everyone had a chance to show his own style. “ The Independence Day Celebration was hosted by Al and Lil Doag, and bod ivienen noms on wnue ca rvoDora readies fo r takeoff f j , . their home was sporting Bicentennial second, and Ed Weesner was first. His best sinnio ... ' ·ΓΓ ''nished third, Don Love í »t Single heat was I 1.1 seconds Continued on page 63 16 MODEL BUILDER John Baxter, first to earn Level V in the League of Silent Flight (L.S.F.) with his Soarcraft Magnum 12.

By TAYLOR COLLINS « SOARING PHOTOS BY AUTHOR First-hand report on the 1975 R/C SOARING NATIONALS, with over 200 fliers in the competition.

• Don’t make a single mistake . . . fly Unlimited (anything within F.A.I. limits San Fernando Valley Silent Fliers perfectly for eight rounds. . . always find goes) categories. Total overall scores for (SFVSF). Winning team members were lift when everyone around you is drop­ the winners o f the two classes o f air­ Terry Koplan, Bill Nibley, and Rick ping out o f the sky . . . nail the center plane were separated by a scant three Pearson, The Junior team from the Ro­ ofthecircle on every landing with deadly points, 5260 to 5257! (Now who says cket City Radio Controllers, of Hunts­ precision . . . and be cool as a cucumber those little airplanes can't compete?) ville, Alabama, won best Junior team through it all. That’s all that is really Mark (who hails from Escondido, honors. Led by Greg Smith (3rd overall, necessary to win the S.O.A.R. Nationals. California . . . home o f the San Sagitta Unlimited) and his two team mates, Mark Smith, o f Windfree and J.L. Seagull Sewer Slough Slope Soaring Society) had Dick Kojako, and James Fitch, the fame and fortune, and Frank Deis, o f lots o f company in standard class com­ young guys made life miserable for a lot Huntsville, Alabama, mastered the exe­ petition. Pete Rambo took second place o f the “ old pro’s.” cution of this formula and took home honors, Rick Pearson was third, Rod If one trend had to be picked out of the big silver bowls and Schwinn bicycles Smith (Mark’s dad!) was fourth, and the contest it would be a trend toward from this 6th annual Chicago ‘big ’un’ Don Edberg took fifth . In case you equality. Everyone and every plane had o f R/C Soaring. hadn’t noticed, all five are from Southern an equal chance. The 100 inch planes For the first time this year there were California. flew in Unlimited class (two were in the separate awards for Grand Champion in Southern California is also the home top five!). The big planes were very Standard (under 100 inch wingspan) and o f the winning Senior team, from the competitive in the precision task. In

Doc Hall’s Schulgleiter SG-38 .. . the 50% larger version was destroy­ the 12 foot span Legion-Air, which he designed. ed one week before the Soar Nats, so this is last year's smaller model. Note large spoilers, aluminum tube tail boom.

SEPTEMBER 1975 17 v

Don Edberg, Covina, Ca., launches Airtronics Gwen Collins w ith her errant Windfree. She’s a Otto Heithecker, the compleat soarer, listens Aquila, with which he placed 5th in Standard. member of W.I.N.G.S., the all-female soaring to "rock" music while circling in sink. You Jack Hiner mans the winch. club. Ship took a mud bath. See text. can’t win ’em all. short, no piece o f hardware, or airplane of Lansing, Michigan C.A.R.D.S. club so rather than dwell on that, I’d like to design showed any advantage over any­ member Bob Robinson); Marty Gill mention some o f the trends that I ob­ thing else. It is becoming more and more (club president and wife o f St. Louis served at this year’s S.O.A.R. Nats. Pro­ apparent that people, not airplanes, win Eagles’ Bob Gill); and Barbara Henon bably the most significant statistic was contests. (winner o f the 1973 L.S.F. Tourna­ the sheer number of entrants... 212. While on the subject o f equality, it ment) showed the male chauvinists that This was the largest R/C glider contest should be pointed out that for the first the femme fliers are a very real threat ever held in the U.S. Although I don’t time Women’s Lib reared its lovely head on the contest circuit. Incidentally, the have the figures, it appeared that entries at the S.O.A.R. Nats. The W.I.N.G.S. husbands o f the W.I.N.G.S. (of which in Standard and Unlimited classes were (Women in National Glider Soaring) club, this writer is one!) were presented with about equal. Many 100 inch airplanes which is the first all female A.M.A. char­ special identification pins in the form were entered in Unlimited, and as I tered club in the country, fielded a o f the north end o f a south bound horse pointed out earlier, didn’t suffer a bit three man . . . e rr. . . ahhh . . . person . . . Gee! . . . Thanks girls! from their small size. team which represented the twenty mem­ The results and pertinent informa­ Four or five commercial designs dom­ ber club quite well. Barb Robinson (wife tion on the winners is shown elsewhere, inated the field. The controversial Hobie

Warren Tiahrt, with Standard Class Legion- Yes, it rained there, too! Greg Temple wrings University of Michigan Felix Pawlawski Schol­ A ir, soon to be available from Cecil Haga. out a sunshade after flying was stopped for arship Award winner, Peter Rambo, from Legion-Airs are very popular. a rainshower. Camarillo, California.

18 MODEL BUILDER Hawk is finally coming into its own. The fliers who have stuck with it and really ‘learned’ the airplane are doing well with it. Both Kelly Pike and Col. Bob Thacker posted perfect two minute precision scores on one flig h t... and perfect is hard to beat! (Kelly tried to impress would-be Hobie owners with the strength o f the bird by driving the spike that marked the center o f the circle three inches deeper!) Ron Lee, o f the Hobie Model Co. was flying the new 10 foot wings (which he assures me will be avail­ able very soon) and they look very good. The increased span has lowered the wing loading and greatly improved the roll stability. Cost will be approximately $10.00 more than the existing 100 inch wings. The Windfree is still a dominant force in soaring . . . there were three in Winning Senior Team .. San Fernando Valley Silent Fliers (I to r): Rick Pearson, Terry Koplan, and Bill Nibley. NSS president, Rod Sm ith, peeks in as Dan Pruss makes award. the top five places in Standard class. The Craft-Air Windrifter is becoming very popular and is performing well in both Standard and Unlimited competi­ tion. (Now if those low-aspect ratio wings just didn’t take up so much space in the pit areas. . . ). The one predominant design in Un­ limited class would have to be the Legion-Air, from Cecil Haga o f Arling­ ton, Texas. This 140 inch giant looks very professional with its four-piece, al­ uminum-sparred wing. And the giant spoilers have got to be seen to be be­ lieved. Given some more time with the design, the Legion-Air contingent could be real trouble. (And Warren Tiahrt of Michigan was sneaking around with a prototype 100 inch Legion-Air that looks very good. I sure would have liked to have seen it fly ... howcum yer so sneaky . . . Warren ...????) Col. Bob Thacker told us three months ago that he was going to win Winning Junior Team . . Rocket City Radio Controllers (Huntsville, Alabama) I to r: Greg Continued on page 78 Smith, Dick Kojako, and James Fitch.Trophy girl Linda Porter looks 'em over.

Soaring Nats Contest Manager presents Dan Mark Smith accepts first place trophy for Top F lite Models' Sid Axelrod gleefully (?) Pruss w ith his own Hobie Hawk rock . . the Grand Champion o f Standard Class. He's been accepts the Willow-Bee Wand from last year's one Dan tried to break with his Hobie. in top three in Standard for past 5 years. owner. Rod Smith. It now has Thacker's tie!

SEPTEMBER 1975 19 CHOPPER CHATTER By JOHN TUCKER

• Over the past couple o f years, pro­ unusual results, which I ’ll pass along to on the other controls. bably the most asked question has been, you experimenters. So . . . let’s get on Regardless o f whether you fly the "What about that KAVAN GYRO .. . with it. nose or the tail, you’ll find keeping the does it really work as good as they say THE GYROSCOPE IN HELICOPTERS helicopter going in a straight direction . . . is it a worthwhile investment?” Well, The KAVAN GYRO is essentially a is the most frustrating part o f learning in addition to a couple of other items, very small, lightweight, automatic pilot to fly the “ beast.” Altitude and power I’ll tackle that issue this month and try which may be installed anywhere in the control, along with the pitch and roll to clear up any misconceptions about R/C model helicopter, and is used to movements, do not present too much gyros and how they work. A little fur­ help control the flight o f the model o f a problem to the tyro, however, ther downwind, we’ll talk about the under conditions of turbulent winds, or, watch out for the swinging tail! To fur­ flight tests of the SCHLUTER HELI- when for any reason, it is desirable to ther complicate the problem, it must be BABY and a serious problem encoun­ maintain straight flight under difficult remembered that moving any one con­ tered in the initial stages oftesting. Ad­ conditions. Obviously, one of its prime trol will always require additional con­ ditionally, Kim and I have been playing advantages is that it can absorb the trol inputs because of interaction of the around with tapered main rotor blades work-load in controlling the tail rotor forces of flight, especially the change in for the past month or so with some while the beginning pilot is concentrating torque whenever power is applied. /L

Applied force causes a reaction, which rotates gimbal frame The illustration shows a left turn, which makes the gyros rotate clockwise around axis "X ". This reaction is 90° in direction of gyro rotation. around axis "X ". This, in turn, rotates the wiper arm on the "pot” , thus producing a corrective sianal to the tail rotor servo.

20 MODEL BUILDER The gyro literally senses the rotational HELI -BABY DRIVE CONVERSION turning of the chopper and sends a signal to the tail rotor servo, which then cor­ rects the unwanted movement. To put it in another fashion, when the pilot is flyinghis helicopter, his eyes “ see” what the model is doing, his brain calculates just what correction needs to be made, and his muscles react by moving the transmitter control stick in the proper direction. The corrective signal is then transmitted to the receiver, which in turn decodes the information and causes the servo to move the control in the proper direction also. You can see that the weak link is the training involved in making the brain come to a correct conclusion and the muscle control in relaying this decision. Well now, if you insert a device (the gyro) in the model, which has the ca­ pability o f “ seeing” a turn and can di­ rectly control the tail rotor servo auto­ 1 — Cut off base flange, file or mill smooth. matically, you have just bypassed most 2 — Mill sides to width of 20 mm (or to fit). o f the normal sequence o f events in 3 — Drill two mounting holes (No. 34 drill). making the model fly straight. Most im­ 4 — Install drive parts and bolt assembly in place. portantly, the brain doesn’t have to get involved! Yes, it ’s a valuable tool for the beginner! If you can afford to spend all that green-stuff, and spend many, many hours over the workbench creating your fav­ orite R/C helicopter, you can certainly afford to install the gyro unit as the best insurance possible. And don’t be too sure i t ’s just for the beginner either. . . a great number of expert flyers still use the gyro in their everyday flying, plus the fact that the gyro also has many other applications which I ’ll cover very briefly a little later on. Mechanically, the gyro consists of a small plastic cube; about 2 inches square, which contains a highly efficient 6 volt motor with 2 brass rotors mounted on each end o f its shaft. The motor and rotors are mounted in a "gimbal,” or frame, so as to be able to respond cor­ rectly to the gyroscopic forces involved. There are also 2 small "centralizing springs" and 2 potentiometers mounted within the cube. The spinning armature The Kavan Gyro installation on the Schluter "Heli-Baby." Note that a mounting plate has been o f the motor and the 2 brass rotors installed, using vibration absorbing rubber grommets, directly onto the landing skid struts. acts like a gyroscope. As such, it has the properties o f gyroscopic action, one of which is “ precession.” Gyroscopic precession is the resultant action (or deflection) o f a spinning object when a force is applied to this object. This ac­ tion occurs approximately 90 degrees in the direction of rotation from the point where the force is applied. As a result, when a turn is made (either un­ wanted or wanted), the gimbal frame in which the gyro is suspended rotates on its bearings in harmony with the turn being made. This rotational movement o f the frame is coupled directly to the wiper-arm o f the main pot, which in turn changes the electrical balance in the tail servo electronics. 1 - Remove aluminum pulley, turn down shaft, install Kavan bevel gear No. 3117. 2 - Modify Kavan bevel gear transmission No. 3105, insert parts 3117, 3109, 3119, 3120, 3118 The behavior o f the gyroscope, like to complete transmission assembly. Install assembly, bolt in place w ith gears properly Continued on page 71 meshed. D rill holes w ith No. 34 drill.

SEPTEMBER 1975 21 UPB 4.11 6.61 6 13 lo.or 11.36 1236 1376 14.65 15.15 14 65 13.47 1166 9.37 6 72 3 73 211 49 0 125 25 5.0 7.5 10 15 30 40 50 60 ' 7P. 80 90 93 100 Chert 0 1 S3 3.03 6.1 9.13 12.2 163 24 4 36 6 48 9 61 73.2 83 4 «.* 109-6 1159 122 LWR 4.11 2 07 1.40 .76 39 037 195 0 061 163 - J r 39 29 .13 .061 0

600 HP CURTISS CONQUEROR V-1570 DIRECT ORIVE ENO.

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CROSS SECTION OF BEADEO 5KJN USED ON TAIL SURFACES (FULL S U E )

DOUGLAS X0-36/XB-7

To order full size prints of these drawings, see ad on page 65 MODEL BUILDER mr ·

DOUGLAS XO-36/XB-7 By PETER WESTBURG

• Until the advent o f the Douglas B-7, wings, and was 20 mph slower than the Martin B-10. the bombing force o f the United States XB-7. Next month we will take a look at Army A ir Corps consisted o f a dozen The Douglas gull winged bombers the smooth skinned production 0 -35’s Curtiss Condor B-2’s and approximately were pioneers in the development o f the and B-7’s, aircraft that enabled the skele­ 130 Keystone B-3 through B-6 bombers. metal monoplane bomber, but they were ton crews o f the Air Corps to learn and All were biplanes with two engines and soon eclipsed by the Boeing B-9, which sharpen their bombing techniques in pre­ open cockpits, and except for slightly was in turn obsoleted by the 200 mph paration for the Big War. · higher speeds and better engine reliabi­ lity, they were much like the Handley Pages, Gothas and Capronis o f World War I. The war maneuvers o f the late twen­ ties in which P -l’s, P-6’s and P-12’s in­ tercepted the slow Condors and Key­ stones demonstrated that better bomb­ ing equipment was needed. A t the time, there was more money in the budget for observation aircraft than there was for bombers, so the XO-27 was ordered from General Aviation (Fokker), and the XO-35 and 36 from Douglas. Two prototype and 12 production 0-27’s were ordered; the second prototype be­ The XB-7 at Wright Field, fitted with Scarff rings on the barrel cockpits, and bomb racks for up coming the XB-8 bomber. The Douglas to 1200 pounds of bombs. Useless little mudguards had been removed. version was originally called the YOLR-35 (Observation, Long Range) but the designation was soon dropped. The second Douglas observation bomber, the XO-36, became the one and only XB-7, the subject o f this m onth’s plan. The XO-36/XB-7 had a corrugated aluminum fuselage, beaded aluminum tail surfaces and fabric covered aluminum wings, to meet the Air Corps specifica­ tion for an all-metal monoplane bomber. The Genera! Aviation XB-8 didn’t make it because it had a fabric covered, steel Two Conqueror engines flew the XB-7, w ith its wing area o f 600 sq. ft., and m aximum gross tube fuselage and plywood covered wood weight of 11,287, at a speed of 169 mph! Wheels retracted, but stuck out enough for landing.

SEPTEMBER 1975 23 By CHAR ROHRING

• Girls, I had this crazy feeling I was going to get a lot o f mail from you yes­ terday. When it finally came I opened one of my husband’s letters by mistake. Now I’m feeling guilty because I actually read it and threw it away. It was a chain letter. It said to reproduce the letter 10 times and send it out to fellow mod­ elers. Within three weeks you would receive 2,374 packets o f nylon hinges! Maybe it was a joke, but with my luck I couldn't take the chance. when I was half asleep . . . he asked if it I’m afraid these twelve grown-up men I had envisioned a postal truck pulling would be okay to have a ‘few’ of the remind me of nothing more than little up to the front door with several bags of guysover to talk theory on Friday night. boys who upon receiving a special treat mail for me, not hinges for Bill. I con­ I naturally said yes, because who argues have to be on their best behavior so tented myself with the dainty little about a little thing like that at two in they may come again! bunch of letters offered and was pleased the morning, right? Wrong! Who would “ I think I will be rather sorry to see to find among them a real jewel from dream his ‘few’ would turn into over a these classes come to an end because I Cheryl Wallace in Largo, Florida. Cheryl, dozen beginners. Thus Beginners School, too have enjoyed sitting back watching as my teenage friends would say, as it was later dubbed, was born. and listening to their enthusiasm, and ‘‘You’ve got it all together!” “ I have to tell you I have never been even occasionally adding a bit of wisdom ‘‘Dear Char, hostess to a nicer bunch o f guys. They o f my own to the proceedings. After having your wonderful article are, oh, so thoughtful on these Friday “ So to you other R/C Widows out read to me by my ‘Mad Modeler’ (June nights that it is unbelievable! As you there: Be tolerant of your Mad Mod­ 1975 issue), and chuckling over its very well know, a modeler is anything but elers, because they are some of the nicest apt descriptions, I just had to write and neat when working, but not these guys. guys in the world! Besides you always share one o f my experiences with you. They wipe their feet upon coming in. know where they are, who they are with, “ My husband has been an avid mod­ One even took his shoes o ff so he and what they’re doing! eler for over 20 years (The Good bro­ wouldn’t track dirt on my carpet. They “ Thanks for letting me tell you about thers strike again, Char) so I ’d say he is carry ash trays around, and talk about this. Keep up the good work in your pretty well addicted to this form of cleaning up after the meeting! When articles. I’m really looking forward to ‘relaxation.’ He has always been one to they had their Monokote session I fi­ next month’s column. help the new guy in the hobby because, gured I’d have bits and pieces of Mono- A Happy R/C Widow as he says, he still vividly remembers his kote everywhere, I couldn’t find so much Cheryl Wallace” own fly-and-crash approach to learning. as a tiny scrap left on the floor. And I like the whole letter except that I should have known something was up when they leave it is always, ‘Good night tricky 2 o'clock in the morning part. when one morning . . . at about 2AM, and thanks so much for letting us come.’ Thanks Cheryl. I’m a little surprised that nobody has written about m y pet annoyance as far as modeling goes. It’s all the little things, living and dead, that come into the house on the pants and socks of the flyer. Things like stickers, prickers, this­ tles, burrs, chaff and stuff. Now here is where I’ve had lots o f experience. I have picked up, shaken off, pulled out and flicked tens o f thousands o f specimens. Probably the most annoying hanger- onner is a thing called Hystrix patula. It took a trip to the local Sarett Nature Center to find out that name. All these years I’ve just been calling it “... that blankety-blank weed!” This hitchhiker is about an inch long and shaped some­ thing like a badminton birdie. It goes into the sock or pant leg easily, little tiny pointy end first. The problem is getting it out. The point is followed in Continued on page 62

24 MODEL BUILDER • Welcome aboard for a pictorial Tour o f YANKEE DOODLE. This open house visit may be that last nudge some new sailor needs to build an R/C Yacht in one of the many classes and to try a dif­ ferent sort o f R/C modeling. Enjoy your­ self on this tour. The last few issues o f MODEL BUILDER have featured con­ struction articles for the YANKEE by our "S trictly Sail” columnist, Rod Carr. Thanks to Rod and MODEL BUILDER for keeping all of us sailors up to date. We are fortunate to have a magazine like MODEL BUILDER covering sailing events and related topics. Many thanks to Rod for his fine shots o f YANKEE DOODLE sailing in her first regatta to a hard fought fourth place finish. The winner was Rod Carr, who put his camera down long enough to show us how it’s done. The few words that accompany this tour will hopefully describe the ‘extras’ that went to this project. Keep things as light and as strong as possible and you should have no problems in build­ ing a winning yacht. Photo No 1: The deck layout was kept as clean as possible. The hatch cover is 1/16 clear plexiglass and is in place in this photo. The cover “ pops” into place and is 99% waterproof. Keep a little tape handy for those real windy days. The porthole aft o f the cockpit is for seeing the tiller when removing the rudder. The deck is 1/16 mahogany air­ craft plywood finished with surfacing resin and clear K&B Epoxy. The entire boat is finished with K&B Epoxy colors and sprayed with clear to finish the job. As always, a good finish starts with a good job of wet sanding and surface pre­ paration. Photo No. 2: Hatch cover removed. The Kraft KPS 16, 180 degree servo trims the jib with a 1 inch diameter drum made from plexiglass and bolted to a rotary output fitting. Sheet trim is accomplished using a single arm on the Subject of this month's photo/story, YANKEE DOODLE,easing along on a starboard tack. sail control in conjunction with the tra­ veller just aft o f the cockpit. Photo No. 3: The radio antenna runs up the backstay. The traveller has proven to be worth the effort when the wind really blows. The hatch cover is in place here, and is flush with the deck surface. Photo No. 4: This photo shows the author’s idea of the radial jib boom fit­ ting and the jibstay attachment. The PHOTOS BY AUTHOR turnbuckle adjusts the vertical move­ ment allowed the jib clew. Photo No. 5: The wide stern helps to keep the boat in order when she comes down off the planing attitude she so easily takes. This is also the end I like the competition to see. Doesn’t always happen that way, but that is what keeps R/C yachting challenging. Photo No. 6: The keel design is the author’s and is known as a “ fin and bulb” keel. The fin is 1/16 aircraft ply­ - i wood over forming ribs and has a sym­ metrical cross-section (airfoil, if I may

SEPTEMBER 1975 25 P hoto 1 P hoto 3 borrow the word). The bulb is formed are made from number 9 fiberglass arrow shows a slightly unfinished stand. from two plastic canopies trimmed slight­ shafts with pine dowels inserted to give Photo No. 8: Easy adjustments are ly and filled with 6.5 pounds of lead the boom fitting screws something to what the new skipper should strive for. shot. The whole works is fiberglassed bite into. Here you can see that the That way it won’t be such a chore to for strength. The rudder is plywood, traveller lanyard makes up to the deck make slight adjustments and you will with the same cross section as the keel cleat just forward of the rudder "p ort­ be more willing to make those little fin and is also fiberglassed. The boat hole.” The stand should support the changes which contribute so much to draws about 14 inches of water, as shown weight of the keel and not allow the boat speed. Here we see the mainsail for comparison by the transmitter an­ hull to hold the weight. This photo downhaul and vang make up at the cleats tenna. shows how not to build the stand, in on the port and starboard side o f the Photo No. 7: The main and jib booms that the.keel is hanging. This photo also deck. The main sheet runs through sin-

Photo 7

Photo 8 Photo 9

26 MODEL BUILDER Photo 5 Photo 6 gle blocks to minimize wear and fric­ the O-ring seals the deck. The mainsail sleek lines as seen in this view. The tion. The servo grommets on each o f the lu ff is a sleeve which slips over the mast. view on the water is the one that turnbuckles keeps them from bouncing This arrangement keeps the turbulence really counts, and 584 holds her own around and making a racket when YAN­ around the mast to an absolute mini­ there too. The rudder shape can be seen KEE DOODLE travels in the back of the mum, since the sail and the enclosed here. It is a counterbalanced design. station wagon. mast form a leading edge much like Photo No. 10: The heart o f the mat­ The mast is a piece o f 3/8 inch tem­ that o f a wing employing a Jedelsky ter in any R/C model is the radio. Kraft pered aluminum tubing with all of the section. Sails are 3 ounce dacron, by radio provides the guidance, with a KPS fittings attached with 0-80 screws. Don’t Carr Sails, and do a terrific job motiva­ 15H manning the tiller, and a KPS 16 forget the Locktiteon the screw threads! ting YANKEE DOODLE. handling the jib trimming chores. The The mast steps through the deck and Photo No. 9: Number 584 has rather Continued on page 78

SEPTEMBER 1975 27 Gorgeous Miss America, rechristened "Miss Sakatoon" by Ralph Dodsworth, of Saskatchewan. Judging by the hinged rudder and elevator, plus the antenna hooked to the fin, it looks like Ralph has decided not to chase after it when he goes flying!

PIV6 SPARKS By JOHN POND tests. The Texaco Event, which features of 1938. Although it was promised as a engine economy, was the most heavily kit by Jasco at that time, the new up­ entered, with 18 aspirants. The winning coming limited engine run rules o f 1939 • Well, it's finally happened! Although time o f 52 minutes was accomplished precluded the production o f this design. this may be old hat to the easterners, by Bob Hoover (you guessed it, his first Bet there are a lot more built now! the first O/T F/F radio assist only con­ contest!) flying a "sleeper” that has Other Texaco winners were Jerry test was finally held on the West Coast been touted by this writer for quite some Otis, at 25:12, and Norman Burnham, at Lake Elsinore on June 28. time as the Texaco model to build . . . with 16:44, for third place. Incidentally, Staged by the San Diego “ No-Name” The "Flam ingo," as designed by Roger Jerry Otis has learned quite a bit about Club, headed up by that red-headed Hammer (of flying scale fame) was never sandbagging since he has moved to San spark plug, Red Barrows, the meet fea­ featured in the Jasco Year Book, but Diego! This time, the writer was the tured Texaco and limited engine-run con­ did appear in one o f the Jasco catalogs unsuspecting victim as his Dallaire was easily 1500 feet high at 12 minutes. Otis advised moving toward the range of hills as this is where he claimed to have gotten lift. In less time than it takes to tell Pond’s Dallaire was on the ground in 15 minutes total time! What wasn’t realized at the time was the fact there was more lift coming o ff the edge o f the water than the slope effect o f the hills. Had again! The limited engine run event featured five minute max flights, this time with 20 second engine runs. This event was won by another newcomer, Bob Sliff, flying a Buzzard Bombshell, for a time o f 9:31. Pond finally got his New Ruler ticking for a good time of 9:31 followed by Rodger Larson flying (what else?) a Bombshell. “ Ponditus,” a disease de­ fined by Jim Dean, editor of "Hot­ heads,” set in on the writer during one o f the flights. Having selected an excel­ lent “boomer,” at four minutes, he An all-black, six foot Zomby, with chrome (Monokoted) cowl, a trademark of Red Barrows' found the lift so strong that it took two models. Super Tigre provides the radio-guided motivation. minutes to get the model down (getting

28 MODEL BUILDER Wish you could see the beautiful orange and blue Monokote cover* Another view of Tom's giant KG-2. Tom's also a charter member of ing on this 10 ft. KG-2, by Tom Mahon, of Sacramento, Calif, area. the Big John Owner's Association. His was the third one built! docked a minute for overtime) and to The first series of Atoms featured a wire throttle to move. Later models fea­ top it off, missing the spot landing. Some very simplified carburetion system, con­ tured the standard type needle valve days, it don’t pay to get out o f bed! sisting of an air choke that was variable body extended across the venturi. Excellent officiating by Gene Bach, by swinging the choke wire in an arc o f Probably the foremost proponent as C.D., was the order o f the day. Gene 90 degrees. This made running o f the and biggest booster o f Atoms was the disqualified Red Barrow’s otherwise win­ engines extremely simple, but as the fabulous modeler, Louie Garami (now ning Texaco flight as he landed too far engine wore, vibration would cause the deceased). On a bet, Louie went to a away from the landing site. Even better sportsmanship on Red’s part for accept­ ing with no complaint! Enthusiasm has generated to the point where another contest will be staged by the “ No-Name” Club on Sep­ tember 21 at Lake Elsinore. If you want to thoroughly enjoy yourself, and yet act somewhat like a competitor, come on out. It really is a blast! ENGINE OF THE MONTH Not everyone knows that the Atom engine was the brainchild of Ray Arden, who gained such extensive fame with his Arden series of engines. Credit must be given to Ray for popularizing the small engine (under .10 cu. in. displacement) as darn few engines o f this size were made commercially. The Atom was almost an instantane­ ous h it when it first arrived on the mar­ ket. Here, finally, was an engine with reliable starting qualities. Even this col­ umnist had to have one. Upon viewing its size, the engine was promptly mount­ ed in the cut-off nose o f a standard rubber powered cabin model, on 1/4 inch thick balsa, and flown this way! With only 150 sq. in. o f wing area, the model proceeded to amaze the writer with a seven minute flight! With others enjoying the same modicum of success, it was no wonder that almost everyone had one o f these Atoms in his stable.

R. G. Brickner built this .020 Replica of the V-K Challenger, and took a 1st place w ith it. Drawn by TEX NEWMAN

SEPTEMBER 1975 29 FULL SIZE PLANS AVAILABLE - SEE PAGE 88 30 MODEL BUILDER Nick Sanford has better luck with free flights. He always gets the Grrrunt! Hugo Lung "assists" his Boehle Giant into the air. He s a Corben Super Ace back, but the R/C Scram . .. scrammed! member of the SCAMPS. contest on the subway, carrying his be an encore to the National Free Flight not to say what the regular free flight Atom powered gas model in a shopping Championships at Taft over the Memo­ events were drawing! To help spur in­ bag! Before the boys had quit laughing, rial Holiday? Bob Hunter and Co. (San terest in entries, Bob came up with the Louie had won first place in Class A Valeers) proved for once and all, the terrific idea o f giving away a brand new and was taking the subway home! Some proximity of a big contest need not Honda 600 motorbike for the Sweep- o f the best known designs employing detract from the size of another. stakes prize (co-sponsored by Taft Hon­ the Atom engine were Louie Garami’s Employing a clever gimmick, Bob da). The boys were really scrambling for designs. To name a few; Stratostreak, wrote all interested sponsors for dona­ that one, but Bruce Norman, flying ba­ Half-Pint, Wahoo, the redoubtable Mol­ tions in the form o f money rather than sically the old timer events only, came ecule (Nats winner!) and a series pro­ merchandise. This proved so successful out as top man! This made the 26 hour duced for Polks called Hummingbird, that when the writer submitted his check drive from Texas well worth it! Rumor Eve, Haymaker, et al. to sponsor an old timer event, he found has it that Bruce is trying to wangle a No one uses Atom engines now, as that Gene Wallock, o f P&W, had paid transfer to the West Coast for the good most o f the engine collectors have stored for all seven events! Wotta good man! old timer flying out here. them away for posterity. If you have According to early reports from Jack Interestingly, the .020 Replica event one, keep it, and enjoy it! Transue (attending the O/T R/C meet was run on the basis o f three flights only SAN VALEERS ANNUAL on Sunday), the old timer events had (something the writer has been plugging Who would have thought there could drawn over 120 entries by then! This is Continued on page 66 PURSUITEER OLD TIMER Model of the Month Designed by: Pete Bowers Redrawn by: Phil Bernhardt Text by: Bill Northrop • Pete Bowers always had a knack for designing clean, simple, functional, and sharp looking models. The talent carried over into his famous Fly Baby Home- built, which even he must admit, is noth­ ing more than a BIG model. A prime example of his design skill is this snappy little '‘Pursuiteer,” which was published in the December 1938 issue o f Air Trails. Though it was de- Continued on page 65

SEPTEMBER 1975 31 Cathy Burnstine lands her Liberty Sport after the flight that gave her first place in Senior AMA C/L Scale. Model was built from a Sig kit. Cathy and her father, Ralph, kept up a running conversation during her flight which was as entertaining as the flying itself. "Two wings are better! Special 1975 Nationals Report

• Yes folks, there was a Nationals in Lake Charles, Louisiana, the week of August 3 through August 10. It came in with rain, on Monday, August 4th, and went out with rain, on Sunday, August 11th, but all the days in between were pretty fair. From a magazine editor's point o f view, it was kinda lonely . . . we were the only editor present. .. though Mod­ el Aviation had reporters and photog­ raphers lurking everywhere, and R/C Scale Modeler covered . . . what else . . . R/C Scale. Attendance was down somewhat, as expected, but some categories, such as R/C Quarter Midget Pylon and Sport Bill Hunter dumps some 'Loosiana Dew' from This whole modeling thing has finally gotten Scale, showed an increase of entries. his boots after chasing a model in the boonies. Johnny Clemens down! Class D Pattern reached an all-new low

"Flying in the rain. I'm flying in the rain . . . " Sid Axelrod holds on Message to free flighters: Not all R/Cers are non-modelers. Top py while Dan Santich looks for low throttle. He found it. Sport scale. Ion racer Kent Nogy flew this A l Vela design in Class C Gas.

32 MODEL BUILDER Carl Goldberg still flies in every Nats, picked up a couple of maxes Bruce Mathews launches his stable Douglas observation bipe. He took in Open H.L.G. Bank it more to the right, Carl! How's the arm feel? 1st in Jr.-Sr. Rubber Scale, sponsored by MB.

Bob Reuther's winning "Miss Cosmic W ind" with Skyglass fuselage. Bob Underwood's 3rd Wittman Bonzo is an excellent flying scale Note mod to exhaust extension on Rossi to meet "no pipe" rule. model. Just missed the U.S. team, placing 4th this year. of 67, Expert and Novice combined. based on the number o f reporters and Special note to Pro Line owners: Free flight, at least to us, seemed as photographers it had floating around, Have no fear, Jim Fosgate is here! He well attended as ever. When rising air the “ Washington Newsletter” will pub­ can be reached at 602-943-9010. The came through, the crowded "perpendic­ lish enough information to choke a company is NOT bankrupt, it is in re­ ular” flight line sprang into life and the horse. ceivership, so hang in there. · mad hornets would bore holes in the sky from all directions. Hardy “ Bull Horn” Broderson kept things well organized and had car and motorcycle traffic flow­ ing smoothly . . . most of the time. Flying scale had a beautiful morning, with mild winds and lottsa lift, however, the extreme heat was rough on rubber, which in turn, was rough on tissue cov­ ered fuselages. Our former C/L editor, Jed Kusik, teamed with Larry Jolly, placed first in the FAI C/L Team Race trials, and then the pair backed it up with a first place in the Nats event, just a day later, to to prove it wasn’t a fluke. Next month, we’ll have extended reports on some o f the events. We could not cover them a ll. . . too many happen "Little" Rhett did it again, making it 3 in a Hardly "Bull Horn" Brokenspar takes a break at the same time . . . and like we said . . . row! Our team took top 3 places. Solid! from directing traffic. It was "Times Square."

Queuing up for a late round of A/2 Nordic. The mood appears to Richard Whitten is not putting a hex on his own indoor cabin ship. be light-hearted ...TIMER!!! He's getting rid of some prop wobble. Won JSO event with 13:53.9.

SEPTEMBER 1975 33 Chuck Rudner (left), MACA's "Killer of the Year" for 1974, and New MACA president. Rich "Von" Lopez, left, and Mike Guthomson Warren Sanders, from Washington, D.C., have at it in Cincinnati. at the '74 Nats. Rich is from Daly City, Calif., Mike's from Texas.

"FROM THE HANDLE" ontrol line By DAN RUTHERFORD

• Bill Northrop certainly has courage. friends. I live in the Great Northwest am not an old hand at modeling. Dad Or a short memory. A few months ago where it does not rain all the time. bought a Jim Walker trainer of some I started writing a Combat column for Really! kind forme when I was about 10, but he AAM. My first column saw them get I am an independent sales represen­ was the only one to try to fly it. At 14 threatened with a lawsuit. After just tative, with my primary employer being I got involved with motorcycles and three Combat columns had appeared, A&L Distributors (Bud Andersand Lar­ have thousands of miles “ in the d irt” AAM went belly-up. The lawsuit and ry Leonard), out of Van Nuys, Califor­ behind me. As I have a tendency toward subsequent bankruptcy weren’t related, nia. Pay. attention now. I am quoting getting totally involved in things, m otor­ but I was involved in a small way. If you from my business card. “ A&L Distribu­ cycles took up all o f my spare time, believe in people being jinxed, would tors, Inc. Stocking over ISO lines o f and the model planes got put on low you ask me to work for you after what modeling supplies. Specializing in R/C burner. happened to AAM? Sure you would. If Planes, Cars, Boats, Parts and Acces­ About 1969, sometime, I was out you have courage... and a short sories.” Yes, folks, I am a gung-ho C/L wheel-walking my Greeves 250 just to memory. Freak, running around the N.W. making keep the neighbors on their toes, when While I hesitate to fill this column my living selling R/C stuff to hobby I noticed a guy flying in a ball field. with trivia, I guess that I should take a shops! Bud and Larry also stock all of We talked for awhile. Next time I was few lines to tell you who I am, what I the good C/L and F/F items, and it is at my parents’ ranch I got the old plane am interested in, etc. On my birth certi­ hard to find a job that you really enjoy, out and fixed it up, learned how to fly ficate, I am Daniel Lee Rutherford so I can’t complain ... But it is an un­ it, and started getting involved in Com­ (thanks Mom, it’s a swell name) but I usual situation. bat. The guy flying in the ball field was am "Dirty Dan’’ to all my modeling Unlike most contributing editors, I Ron Scoones, by the way. Ron and I

Result of engine-to-engine mid-air. Motor belonged to Tupper, of the Modified "Carrier Pidgeon" from M.A.N. plans, by Joe Koch. It Polish Pit Crew, Chicago. Ouch! weighs 26 ounces and is powered by a Super Tigre .35.

34 MODEL BUILDER Boeing jet style vortex generators on Howard Rush's Goldberg Jr. Satan. More lift and tighter turns (in one direction) should result, A few inside and outside loops should tell the story. Dandy for catching combat streamers, anyhow. Did they work, Howard?

competed as a team for several years I lack in experience with enthusiasm, for me. and have done a lot o f winning (and double-talk, and B.S. The big thing in C /L for me is Com­ losing!) together. Ron was ranked as the With all the different forms of mod­ bat, and I fly all the classes: AMA (Fast), No. 11 MACA Combat flier last year, eling available, it is hard to settle on Slow, FAI and .049 Combat. The Rac­ and is chairman o f the new Combat Ad­ just a few events to compete in when ing events are great, and I fly Rat, Slow visory Committee to the Control Line you are like me and think that most Rat, Goodyear and Mouse. I never Contest Board. everything that flies is pretty neat. After thought much of the Stunt event until All of this means that I have been trying just about everything from 29

Steve Sacco, from Boston, Mass., and his Bosta. This model features Old Number 9, Rich Lopez, in the MACA 1974 top ten, doesn't a molded fiberglass leading edge. wear a plain white shirt any more.

SEPTEMBER 1975 35 36 MODEL BUILDER Dick Johnson's "Flying Pancake." The Ellehammer, built by Ted Dock. MODELS Premier Parcel Post Proxy BUILDER'* Peanut SCALE CONTEST OFFICIAL CONTEST RESULTS PHOTOS BY WARREN SHIPP First Place Overall and 1975 GRAND PEANUT Morane Saulnier, by CLARENCE MATHER San Diego, California First Place, Pioneer Class Blackburn Monoplane, by JOHN BLAIR Green Mountain, North Carolina First Place, World War I Class Morane Saulnier, by CLARENCE MATHER San Diego, California First Place, Golden Age Class Waterman Gosling, by PHIL COX Highland, Indiana First Place, World War II Class Sucker Jungmann, by WALT MOONEY San Diego, California First Place, Modern Class Fike "E", by JIM GERZ Roald Tweet's highest scale points winner. Chicago, Illinois Highest Score in Scale Judging Sopwith Triplane, by ROALD TWEET Rock Island, Illinois Best Flight Score Fokker E-Ill, by ROBERT STEWART Hornby, O ntario, Canada Best Shipping Container Tie: Snoopy's Doghouse, by JAMES HYKA Warrensville Heights, Ohio and Sopwith Hangar, by ROALD TWEET Rock Island, Illinois Worst Postal Damage Lockspieler and Shinden Canards, by ALEC PEDASHENKO Woomera, Australia Best Model from Walt Mooney Plans Waco SRE, by DANIEL WALTON Sepulveda, California Best Peck-Polymers K it Pietenpol Sky-Scout (Mod. from Air Camper kit), by Blackburn Monoplane, by Don Eble, was 2nd in Pioneer Class. JOHN KR E KO V IC H , Overland Park, Kansas Blackburns placed 1st, 2nd, and 3rd. Best Biplane Sopwith Pup, by JOHN BLAIR Green Mountain, North Carolina Best Overseas Entry Luton Minor, by ANDREW MOOREHOUSE Cambridge, England Best Junior Entry Hawker Fury, by LAKE WILSON (Age 13) Long Valley, New Jersey Oldest Qualifying Contestant RAY MALMSTRÖM (Age 60) Harlton, England Youngest Qualifying Contestant DAN EBLE (Age 11) Uplands, California Most Distant Entry DAVE LINDSTRUM Pietenpol Sky-Scout, modified by John Krekovich. Al Kuwayt, Kuwait SEPTEMBER 1975 37 This series of cartoons and flying instructions were a part of Steve's scale presentation for Model Builder's Proxy Peanut contest. We thought you'd enjoy them as much as the contest officials and fliers did. . .. Oh, by the way, Steve is 16 years old . . .

It is imperative that this plane has a good initial climb; therefore, when The plane flies best in a fast climbing left circle. launching, point the nose 15 to 20° skyward and toss GENTLY aloft.

On a 16 to 1 winder, the Mister Mulligan took 70 winds on the Beware of gorillas, as they will prove fatal to this plane, winder and did approximately 30 seconds consistently.

38 MODEL BUILDER Λ

- - - — — - - ■ . T? — —‘— — ■

On occasion, the rubber band will wad up in the nose; this will usually result in a scale glide (which resembles closely that of a clump of grass or a brick). Due mainly to this, it is desirable to stay within catching distance.

One last thing; make sure the flight path is relatively clear of humanity, for if the ship fails to climb more than 10 feet in its first 2 or 3 seconds aloft, it has a tendency to crash into the nearest obstruction.

SEPTEMBER 1975 39 George James built this Jenny, a highly modified Comet kit. Powered by a VL Products electric motor.

FREE FLIGHT SCALE By FERNANDO RAMOS

• This month I have several items that Since then, o f course, we have seen addi­ is very high, followed by a cruise type I would like to cover, but first I think tional units on the market ranging in condition, followed by a free-wheeling- an explanation is in order. A couple of power from small F/F all the way to prop condition. In my observation with months ago I said that I would be mak­ large R/C models. scale models, this causes a model to fly ing a kit conversion o f Fly-Lines’ Cur­ The biggest advantage to electric, as left under the initial torque, then all of tiss Robin. Well, the project is alive and I see it, is that there is no noise problem, a sudden it will start to go to the right kicking, but I haven’t had the time to and the way things are today, that’s under the cruise condition. Too often get it any further along than I presently certainly a big plus. This means that this right turn gets tighter and tighter am. However, I do see daylight ahead school grounds, where gas powered mod­ resulting in a crash. O f course, not all and you will be seeing this two-parter els are no longer allowed, will probably models react this way, but I did see very soon. be receptive to electric models. Charging several o f them do this at a recent Flight- Electric as a motive source for model time can be varied so that short motor masters all-electric contest. airplanes has been around for quite some runs are possible in the case of limited One way to rectify this problem is to time, but it has been only recently that flying space. have a variable pitch prop. As yet, I anyone took it very seriously. When Mat­ Does electric have any disadvantages? haven’t looked into how this could be tel introduced its very popular High- Yes, I think so. Weight for one. Electric made, but I can see a future article on Riser and Super Star electric powered, motors seem to be inherently heavy, as this subject right around the corner. If quick charge flying models, the mod­ are batteries. Another interesting point any o f you have any ideas on this sub­ eler saw real potential in electric power. is that the initial torque of the motor ject . . . pass it along for the rest o f us to see! In the meantime let’s play with what is presently available, and to help you along, here are a couple o f ideas that I

VL Products electric powered Longster, possibly from an R/N Models kit, built by Larry Real Anzani three-cylinder engine from Moss. Great design fo r flyin g scale. which model at right was copied. 40 MODEL BUILDER would like to pass on. For scale work, I personally feel that geared motors are the only way to fly. I ’ve gotten argu­ ments on this subject, but I still prefer geared motors for scale models. For one, a geared motor can swing a larger diam­ eter prop, resulting in a more realistic flight pattern. The non-geared motors have to swing smaller diameter props in order to turn the very high RPM’s which these motors are designed for. Since many scale modelers probably have one o f the Mattel units, I would like to show how it can be modified for lighter weight and easy installation. The thing o f course, is to take the unit com­ pletely apart. Now look at Figure 1. See how the prop shaft has been mounted on the motor, using some shim brass stock and 1/8 inch O.D. brass tubing. The prop shaft should be in place prior to soldering to insure proper meshing of the gears and straight prop shaft align­ ment. The three tubes around the motor are for mounting. Take 3 pieces of 5/32 brass channel about 3/8 inch long and This Curtiss 0-X5 Robin was built from Cleveland 3/4 inch scale plans by Phil Cox, Highland, Continued on page 69 Indiana. Span is 30-5/8 inches, and weight, without rubber, is 2-1/2 oz. Glen Goubeaux photo.

Bill Stroman's Sopwith Pup is powered by the popular VL Products Jack Bales constructed this C/L electric powered Gee Bee. Electric electric motor. power is really beginning to catch on with scale modelers.

Fernando's Caudron, built from an R/N Models kit. The VL Products electric m otor is hidden under the scale Anzani engine. See text.

SEPTEMBER 1975 41 we flew the prototype Escondido Mos­ quito (8” wingspan) inside an A ir France Boeing 747 flying at 33,000 feet. The flights were witnessed by professional magician David Lawrence, o f England, and acharming French stewardess, whose name, regretfully, was not recorded. The aft section o f the cabin was chosen for the experiments, as the few passengers there were sound asleep, in spite of the fact that it was broad daylight. Durations were quite limited, owing to the cabin pressurization turbulence, but consider­ ing the speed o f the 747 “ flying site," the Mosquito may have also established some sort o f distance record for rubber- driven models while aloft! A LARGE MEASURE That’s what Xerox machine operator Tom Matterfis sez we will get if we per­ sist with our copying o f plans by that system. According to Tom, all copying • Our lead-in line this month was con­ treated to fine meals and personally con­ machines, by law, must expand the im­ tributed by Douglas Gillies, o f Glasgow, ducted tours. Kind words were heard age slightly; the rather naive assumption Scotland, who found it on a small desk frequently regarding this publication, being that this will prevent exact dup­ calendar. Doug was host to your author for which we are most appreciative. Our lication o f money or negotiable securi­ during a recent R & R (Research and debt to our hosts is enormous, but we ties. Thus, in the case o f Xerox ma­ Recreation) trip, wherein we visited mu­ shall make every effort to repay it in chines, the amount o f stretch involved seums, modelers, and historians in some form or another. The common is about 3/16” in 13”, or .01442% France, England and Scotland. We’ll be bond among aviation enthusiasts is a which could cause modelers some trou­ commenting upon our findings from marvelous thing, and deserves careful ble during the static scale judging por­ time to time, but by way of a brief sum­ nurturing at every opportunity. Would tion o f a contest! Further, copies o f mary, we found aviation alive and heal­ that the w orld’s politicians could get copies accentuate this effect, so a fourth thy virtually everywhere, and the en­ along as successfully as aircraft admirers! generation print might have “grown” thusiasts are absolutely first-rate human NEW ALTITUDE RECORD? some 3/4 of an inch! To play this seem- beings. We were received with cordiality, As the result o f a dare by C.G. Scott, Continued on page 76

CO2 powered BE 2e, by D. Banks, Kingsbury, England. Photo taken by Ron Moulton, Managing Editor of Aeromodeller.

Fokker C-1, in Russian markings, by Dave Stott. Photo by Tom F6F Hellcat in French Naval markings, built from "Flying Scale Nallen. Models" plans book. Built by Aime Roger, of France.

42 MODEL BUILDER

and since the FAI Semi-Finals are ready to descend upon us as you read this, it seems appropriate that some attention be given to two influential develop­ ments which can have a significant bear­ ing on winning and losing. Three View No. 1 is o f Ekhtenkov’s A/2 winner from the 1974 World FAI Championships. Look it over carefully when you are reading the section o f this column dealing with model design. To go with this, we also have several sketch-views o f John Clear’s ultra-simple- make-it-in-your-own-workshop Circle Tow hook. John Clear is an expatriated Britisher, who at present resides in the Seattle area. Generally he can be found at the F/F sites launching rather strange appearing Close-up of circle-towhook, identical in operation to the John Clear hook illustrated on page 49 o f this issue.

DARNED GOOD AIRFOIL - MVA-439

LEADING EDGE RADIUS 0.8

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

UPPER 0.8 2.5 3.4 4.9 5.9 6.8 8.1 9.0 9.6 9.4 8.7 7.5 6.0 4.2 2.3 1.8 0

LOWER 0.8 0.2 0.1 0.1 0.2 0.4 0.9 1.2 1.7 2.0 2.1 2.0 1.6 1.1 0.6 0.5 0

SEPTEMBER 1975 47 VALERIJ EKHTENKOV's F1A, EVG 1172

48 MODEL BUILDER ENGLISH TOWHOOK — Based on Ian Fairgrieve's design (in Free Flight News, Feb., 1973) by John Clear

3. BEARING TUBES — Brass, soldered to chassis. Washer filed to press f it and soldered 6. SPRING — 1/32" Wire. 9 to 10 turns on 1/4" mandrel. (Experiment w ith different size springs). 4 . PIVOT - 3 /3 2 " I. D. brass tube, 1/2” long, soldered to chassis. 7. LATCH - .020" Wire. ■ Two winds O- 5 . CO LLET — Brass cable end (from m otorcycle shop) T Solder short end to chassis leg. "Discard grub screw and drill 1/8" right through. Tap cable hole 4-40. Cut 1 /1 6 " o ff each end. 8. LINE GUIDE — 1 /3 2 " I. D. brass tube bent w ith F it tw o 4-40 screws and .020 line hook: q q m onofilam ent nylon inside and soldered to other chassis leg. Two winds

Rubber band Plunger and spring. \ Line to tow release pin and tim er.

RUDDER MECHANISM (TOP VIEW)

Plywood horn and bumper stop

OPERATION Turnbuckle (helps adjustments). 2-56 Nylon screw in 1/8" ply. Tow ring on, hook latched, pin holds timer off and rudder plunger forward (spring compressed). When line is pulled on tow, the rudder is held straight (adjust with the nylon screw). PLUNGER AND SPRING DETAILS: When line is slack, the rudder is pulled over by the rubber 1-1/2" Brass stud (2-56) and two nuts. band (adjust with rear nut on the plunger). Spring from ball-point pen. 2. Hard pull (about 4-1/2 pounds) unlatches the hook, spring .020" Wire hook soldered on front end. compression allows 1/8" slack on the rudder line and 3 /3 2 " I. D. aluminum tube stapled and epoxied rudder moves over slightly to give zoom release. to fin (raised approxim ately 1 /1 6 " to clear nuts). 3 . Model released into thermal in clim bing turn, release pin allows plunger to push the rudder back to the glide setting (adjust with the front nut), and also starts the timer.

SEPTEMBER 1975 49 flying beasties with no fuselage, or with no tail assemblies, etc. Nearly all are diesel powered or rubber powered or unpowered. Inventive lad, this John. The May, 1975 issue o f Bat Sheet carries this recent inventive development by John. This towhook can be assembled with ordinary hand tools, and the odds and ends o f metal parts that can be found in any modeler’s shop. The parts shown are sketched full-sized, so you can start building one now. Directions should be self explanatory once you “ walk your way” through them, along with the sketches. By the way, the 3-views of the “ IN­ TERN,” in the July 1975 issue had a couple of errors. First o f all, the wing chord is 5 inches, as shown in the wing plan. The 6-5/8 inch dimension on the fuselage side-view is actually from the wing leading edge to the base of the pylon. The other error probably won’t cause any confusion. Somehow, the Photo taken at 1971 Nats of Charles Apprendi Jr., and his Starduster 900. Note placement of spars on this unmodified Competition Models kit. See text. word "scale” got into the description of the plane. No one will spend too much time looking for the prototype! BALANCED WING CONSTRUCTION There are several problems that mod­ elers encounter which can be solved at the design stage. One o f these is warpage (unintentional). Undesireable warps can be eliminated when you design your wing and stab layout. Methods vary . . . all-sheet construction or a full-geodetic structure are very warp resistant, but there are ways o f solving the warpage problem using traditional straight-rib structures. It all depends upon the lay­ out o f the spars (and using a straight building board). In the 1959-1961 ZAIC Yearbook, David Andrew suggests a structure which will eliminate warpage due to tissue shrinkage. The system involves drawing a rectangle around the airfoil pattern (see sketch), then subdividing the rect- Continued on page 87

Another, and newer Competition Models kit, the Orbiteer. Note balanced spar placement, as described in the text.

Guy Kirkwood gets nice ROG launch on his K&B 40 powered Playboy Sr. at the Southwestern Chuck Thompson's Satellite 788 bores hole in Regionals, last January. sky at January Regionals. Took 2nd in B Gas.

50 MODEL BUILDER £/R£DRAK£ t/2A · A triple-threat design to consider in your search for the ultimate Half-A . . . it climbs, glides, and penetrates.

• Firedrake is one answer (mine!) to a ratio is set at 7 plus to allow some airfoil erate (75%-80%), and tail moment is knotty problem. The problem is double­ efficiency. Foil thickness is near 11% long. Left thrust is required for VTO category 1/2A competition. for the same reason. Reynolds number is stability, and wash-in is used in the right Unlike their bigger brethren, 1/2A’s not found only on boxes o f aluminum main wing panel to keep it up in the don't fly too well to begin with, and wrap! Incidence is low, as is stab area, power phase. Parabolic surfaces are used current designs tend to emphasize either but it’s placed way back. That’s why no because o f their warp resistance, their climb or glide. The results are 200 inch down-thrust is needed. A ft fin is used ease of plotting, and their extra 5% of bombs that climb like balsa prices and because it looks better than underslung area over an equivalent ellipse. Also I glide like anvils, or 350 inch overcasts and is less likely to be damaged, being think they’re pretty. I like to cant the that will do 7 minutes from an altitude light and built-up. The fin is thick to engine to keep exhaust glop o ff the of 63 feet. They will also, exhibiting all allow for better alignment and less criti­ timer(s) and/or fuse. The big pylon the penetration of an overcooked arti­ cal tab adjustment. CG position is mod­ makes a nifty baffle. Finally, a pres- choke, d rift out o f sight in 2 minutes and 49 seconds. Considering that a pair o f each is needed for a busy season, you’ll see why I view 1/2A competition as a problem ... if not a four-star pain. I also view it as a helluva lot of fun, what with relatively inexpensive planes and hordes o f flyers. The logical step, then, is to try to design a ship that can climb, glide and penetrate. All three, not the best two of! Firedrake (a kind o f little dragon) does the job. Fie doesn’t have a terrify­ ing contest record, because he’s fresh- hatched, but four other flyers have the plans, so time, as always, will tell. The kit that is in planning will also help in this regard. Seems the chugbugs that win the most come out of boxes, so watch the Digest. Design philosophy is not so simple as you might think, since 1/2A’s are not visions o f efficiency, due to their size. Scaling down bigger birds often results in mini-duds, so Firedrake started life as what he is. I call it ‘he’ because it is no lady. He’ll bust you in the ear quick as a wink if you don’t pay attention. As far as numbers are concerned, the aspect "When my fillings rattle, I know I’ve got at least 24,000 rpm."

SEPTEMBER 1975 51 FULL SIZE PLANS AVAILABLE - SEE PAGE 88

52 MODEL BUILDER dry (don’t install dihedral break ribs yet). On the right main panel, remove the pins from the leading edge, except for one at the root. Block up the lead­ ing edge at the tip dihedral break 3/16 inch, and slip a 3/32 shim under the leading edge at the mid-point. Now pin the leading edge down against the shims, install upper main spar and fit and glue the diagonal ribs. On the tip panels, unpin the trailing edge, except at the in­ board end, and shim up 3/32 at the point indicated. Pin at this point and finish assembly. When all panels have dried at least 24 hours, remove and trim spar ends to dihedral angle. Fit dihedral ribs and epoxy panels together, blocked to correct angle. Again, let set as long as possible. When thoroughly dry, remove and epoxy in gussets. If you fly over hard ground, a piece o f 1 /32 ply backing up the top main spar at the center di­ hedral break will help absorb DT shock. surized fuel system is pretty well neces­ didn’t use them. The tapering outline Finally, install turbulator spars and hold­ sary for consistency. provides lots o f stiffness. When thorough­ down rubber braces. Carve and sand Construction is very simple, since ly dry, sand and apply two coats o f un­ leading edge and tips and apply two it’s lifted o ff Tom Hutchinson and salted thinned dope to edges, then sand off coats o f unthinned dope to the edges. with Satellite dust! It’s best to build fuzz and set aside. The fuselage is o f the familiar profile the flying surfaces first as they can stay The fin can be built with epoxy or type, but is deeper than average because pinned down fora couple o f days. That’s old-type model cement. Glue and pin the greater cross-section is more warp- rig h t. . . days! I like pretzels too, but both ribs in place and, when dry, sand resistant. The little beast is looong. The to chomp, not fly. Since this is not a edges to mate with the other side. You nose length and shape depends on the beginner’s bird, I’ll only bore you with can try a sheet fin if you like, but dig a typeof mount used. Use epoxy to install the fussy stuff. fox-hole first! Sand the fin edges smooth, the pylon and laminated firewalls. Sand The stab should be built using epoxy but don’t pre-dope it. in at least 1° of left thrust before in­ for light weight and high strength. A The only flat panel in the wing is the stalling firewall. Epoxy a bit o f 1/2 inch little dab’ll do ya. The turbulator spar left main. The right main and both tips nylon or fiberglass tape around the fire­ notches are cut after the ribs and top have build-in warps. To make sure the wall and cheek fronts. Once again, leave spar are fitted. Let the completed struc­ warps stay in, follow the sequence. Pin the structure pinned down for at least ture dry pinned down for at least 24 down leading and trailing edges and bot­ 24 hours, especially if white glue is used. hours. The diagonals are optional, I tom spar. Fit and glue the ribs and let Continued on page 86

SEPTEMBER 1975 53 Sprint car by Jim Aubrey. Shocks, Pitman arm (movable) and stacks for appearance. Exhaust goes out bottom.

R/C AUTO NEWS b v C h u c k h a l l u m

• The Third Annual McCoy race was ed like they were over the ROAR noise least 30 cars out to check set-up and held in Anaheim, C Aon June 22, 1975. level lim it. We’ve got to get a workable get a feel for the track. Several Northern What a race! There were 68 entries, in­ tech system to check the sound level of California drivers were out, and the locals cluding several from Northern California, at least the main event cars. The majority appeared to be letting them run more and Arizona. Just about every brand of of cars were in the Novice and Amateur (the Arizona group showed up very early car was represented, with the exception classes, several Sportsman drivers, and Sunday morning). The best running cars of Marker. All of the cars seemed to 17 in the Expert class. on Saturday belonged to Gene Husting, have lots of go-power, and many sound­ A t Saturday practice, there were at Bob Titterington, and Bill Jianis. My

54 MODEL BUILDER car was running about as fast as Jianis’, but seemed down on horsepower. Sunday came and so did the racers. The pits for the cars extended about 2/3 around the track and were two deep behind the start-finish area. Because of the turnout, there was only one 5 minute round o f practice for all drivers, and then right into racing. The race schedule for each driver class was two 10-lap heat races, with the top three qualifiers going to the main, and many o f the better times going into the semi-main and the top finishers o f the semi moving into the main. So there were about 30 heat races, 4 semi-mains, and 4 main events, with 7 to 10 cars in each main. The heat racing started about 10 am. The weather was great, with a slight overcast, clearing about 10 am, and afternoon temperature about 80°F. Just before the heat races, Concours was judged. Earl Campbell took top honors with his great looking VDS paint­ Body for Jim Aubrey sprint car was made by full scale midget car builder, Don Edmunds, of ed in McLaren orange and black. Then Autoresearch. Servos actuate through cables. the racing started. When the sounds qui­ eted and the rubber and exhaust cloud cleared, Earl Campbell was top qualifier. In all o f the main events that followed no one seemed to have a clear cut ad­ vantage in any class except Expert. There again, Campbell seemed to have it his way. I could hear him talking during the race, just waiting for the right oppor­ tunity to pass. So in the end, Earl Campbell won expert main, with Gene Husting second and myself third, all with 60 laps. Gene and I had quite a race for second. We were going at each other, mostly Gene trying to pass me, for 5 to 10 laps at a time. The only thing that kept me in the race was one fuel stop versus two for most o f the top finishers. The top finish­ ers in each class are tabulated below. Novice Main 1. Darrell Smith Campbell's Veco-McCoy powered carburetor! It's a huge Kavan 45 (bore about as big as a 2. Hary Huot Perry 60). 3. Curtis Husting 4. Gene Elgas 5. Don Freeman 6. Don Stewart Amateur Main 1. Jeff Thompson 2. Gary Swain 3. Mike Aguirre 4. Don Newberger 5. Glen Stone 6. Jeff Rold Sportsman Main 1. Jerry Thompson 2. Jim Cade 3. Dennis Dean 4. Bill Steele 5. Dennis Towry 6. Bill Watson Expert Main 6. John Thorp Trophies were presented down to fifth place in each class. The trophies Hallum’s Veco-McCoy with Perry 40 carburetor. Doesn't give much away on power, but gets were terrific, with a 1/32 scale Porsche better mileage. Note pressure connection to muffler.

SEPTEMBER 1975 55 56 MODEL BUILDER ETME 1975 SEPTEMBER ■ c . These modelers are hard-driving experts and their planes are the Superstars Superstars the are planes their and experts hard-driving are modelers These omn arbtc ad tns ht el icat olnt ei t d. n, of And, do. to begin per­ couldn’t often shows, aircraft public real that countless stunts and through put acrobatics get They forming world. flying the of o ln ge truh oe reig okus n til ta te ns that ones the than Show Team. trials AMA the to belong and workouts grueling more through goes plane No flattered . . . But, we weren’t surprised. weren’t we little But, a were . we . . solicitation, flattered of form any SUPERwithout chose models, their individually MONOKOTEfor members team AMA the that out found we when So, the truly professional finish and this just proves our point. our proves just this and finish professional truly the ore hyhv ob eti piecniin n appearance. and condition prime in kept be haveto they course, sanding and polishing. Besides, it’s moisture-proof, fuel-proof, stain-proof stain-proof fuel-proof, moisture-proof, it’s Besides, polishing. and require even sanding doesn’t It easy. and fast as on goes that finish other no There’s So, if you’d like to give a professional finish to your model, join the profession­ the join model, your to finish professional a give to like you’d if So, doping, sealing, to end welcome fade-proof. and a puts it yet, best And, skills. special any SUPER MONOKOTE was that modelers telling been we’ve years, for Because, als of the AMA Show Team .. . SUPER MONOKOTE MONOKOTE SUPER . .. Team Show AMA the of als HN OTCIG DETSR,TL ’M OE BIDR ET YOU! SENT BUILDER MODEL ’EM TELL ADVERTISERS, CONTACTING WHEN T o pF l i t eM o d e l sIn , c . ,2 6 3 5S .W a b a s hA v e .C , h i c a g oII , I . YOUR et plane. next

57 were going fast were using the simple plate-type chassis. The RaCar and Dyna­ EXCLUSIVE U.S. DISTRIBUTOR mic suspension system cars were too fragile and also came apart during races. RaCar even had a two-speed transmis­ sion. LIST PRICES DEALER INQUIRIES The originators o f R/C car racing » INVITED (George Siposs, Norb Meyers, et al) STANDARDENGINE 1 were quite the purists, and followed the . | r > current automotive design trends. Just TUNED-PIPE ENGINE ΐ £ ^ ^ · ^ · ΐ · | ΐ Ι building a car and seeing it run was exciting. Then a few more people caught the R/C car bug. Now there were enough R/C ENGINE S83.95 people to have a RACE. I saw my first race in about 1969. There were num­ erous spin-outs and many break-downs. Bill's miniature engines I thought, this is interesting, but you 1325 CAROL DRIVE, MEMPHIS, TENN. 38116 (901) 397-0484 can’t really race. I decided I’d wait until the cars got more reliable and practical before getting into the R/C car hobby. FOR THE BEST IN So anyway, about 1-1 /2 yrs. to 2 yrs. later, in 1971, I went to see my second STANDARD CLASS RSTR0 flight me R/C car race. What a change. These cars P IO N EE R S IN S IL E N T F LIG H T were really racing and appeared to be 13377 Beach Avenue staying together. The two cars that were $49.95 Venice. California 90291 doing the best were Associated and Del­ AS-W15 ta. Two new names to me. Upon inspec­ tion, I found simple plate type chassis Wing span------100" with no suspension and a centrifugal Area — 650 Sq. in. Flying weight - 38 Oz clutch as the drive train. A simple band For 2 channel R/C around the clutch bell provided braking. STD. HI-START -S24.95 My first thoughts at this race were, Rugged molded ASTRO START - S29.95 how a simple rear suspension system plastic fuselage would really improve the car handling, ALSO: MONTEREY - Span 100" - S34.95 and that I was going to get into this MALIBU ------Span 7 5 " $25.95 hobby! But how could I get into this A S -W 1 7 ------Span 1 3 4 " $79.95 hobby without spending much money? At the time, I was doing some consult­ ing work on the side for Mickey Thomp­ son, Titanium Racing Components (Ti-22 Model Aeroplanes Can-Am), Chaparral Cars (Jim Hall), lj. A Splendid Gift and L.M. Cox. TRC expressed an interest Bill Haniun'* Pcanul ver­ in entering the R/C car field, so I wrote sion o f the -Ideal” Nieu· a proposal to evaluate, compare and de­ port. Basswood jn d balsa construction; tissue cov­ sign them an R/C car, with rear suspen­ ered. Complete kit . white tyred simulated sion. The deal fell through as TRC was spoke wheels, plastic prop sold and then went out o f business. But and thrust bearing, pnntwood. reed, rubber strip and detailed Instruction Manual S4.4V (S5.00 securely packed and post I had the bug. I used my hard earned paid). N J. buyers add $ Ί sales lax. money and bought an Associated car and Peanut Plan Special . . Five Peanut Size K it Plans WW| and Golden Age Biplanes. S I.50 post paid. Scratch Builder Super Cox gave me a few .15 engines. Offer' Plan set and pnntwood for all five models. S5.00 post­ After I had run R/C cars for about a paid N.J. buyers add 5% sales tax. year, I decided to start on a rear suspen­ VINTAGE AERO 20-page Catalog SI.00 sion (RS) car. But instead, a situation DEALER INQUIRIES INVITED came up where I could get my own R/C car company started and the RS car went VINTAGE AERO on the back burner until a basic car I THE GLEN · TENAFLY. N. J. 07670 could be developed and marketed. In mid 74, I had an RS car going, good, 917-10 crowning the variable height pe­ bounces over the imperfections in the too, but it was not strong enough (same destals. The track closed at 7:10 pm, a track surface, losing cornering ability problems as years ago). Now, in 75, I long race day. and speed. You probably also notice think the answer is finally about here. I’d like to thank the Anaheim Road- that most cars have low speed power So you can see I’ve thought about sus­ runners, Russ Camp, and all the race oversteer. Both of these conditions can pension systems for quite some time. crew for putting on a great race. be improved by the use of good suspen­ And their time (suspension systems) will Now on to a few words about sus­ sion systems. In general, suspension sys­ be here shortly. pension systems for R/C cars. tems are supposed to improve overall I didn’t mean to reminisce quite so Have you ever really listened to the traction by keeping the tires on the much, but that’s the way it came out. super R/C cars during a race? If you track surface and providing more uni­ Anyway, my next article(s) will go into have, I’m sure you hear the same thing form loading. But i t ’s more easily said the basic requirements o f suspension I do. In the high speed corners and than done. systems, reasons for suspension, current straights, the engine speed is not con­ When I first got into R/C car racing front suspension systems, current rear stant or uniformly increasing, but rather, in 1971, the above thoughts were already semi-suspension (rocker rear ends), rear it is peaking and loading down as the car going through my head. The cars that suspension, old suspension systems and

58 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER Designed and built by Boeing Aircraft Com­ pany. the legendary B17 Flying Fortress was "the guts and backbone of our aerial offensive" as General Hap Arnold put it The tremendous fire power of its thirteen 50 caliber Machine Guns and the special formation flying, en­ abled the Squadron to penetrate enemy terri­ tory without fighter escort Our Model is a faithful and highly detailed replica of the Prototype. Frame members are accurately Die- Cut from finest quality Balsa and every part numbered to insure fast accurate assembly as shown on the Step-by-Step Plans and instruc­ tions Many highly detailed and Plastic Parts simplify assembly Included are Chin Turret, Nose Canopy, Top Canopy. Navigator's Bubble, Top Turret, Ball Turret. Tail Canopy, Tail Gun ner Enclosure, Cowlings and Nacelles Also included is Covering Material, Formed Wire Parts, Wheels, Authentic Decals, Hardware (that includes Control Line Parts) etc etc Kit can be built many ways: Rubber Powered (as supplied), Gas, CO. Engine, or Electric Motor For Free Flight, Control Line or Radio Control or Static Scale.* Any version makes a Museum­ like Model SCALE: %"= 1 FT. SPAN 39" LENGTH 28Ά" GAZELA PRIMEIRO

This 1883 Barkentineisthe last Square Rigged Ship of the Portuguese Fishing Fleet, which yearly sailed to the Grand Banks. It is now a part of the Philadelphia Maritime Museum, and is permanently moored at its own Dock, Pier 15 North, Delaware River. Our Kit is rel­ atively easy to build and features Step-by-Step Assembly, as well as Rigging. Plans guide you unerringly thru hours of pleasure Exquisitely detailed Kit contains Printed Cloth Sails, Ma­ chine Carved Pattern Grade Pine (or similar) Tapered Masts and Yards, two colors two sizes Rigging Cordage. Authentic Decals and Flags, beautifully detailed Cast Metal Fittings. Mount­ ing Pedestals and Base etc. HEIGHT 8 " LENGTH 1 4" KING FISH

Patterned after the sleek Ocean going Sailing Plastic Hull which is finished except for minor Yachts, the King Fish is a beautiful sight on trimming. Kit is unusually complete and fea­ the water or on your mantlepiece. Fine per­ tures Mahogany Deck Cabins and trim, Brass formance is the keynote when operating Free Chain, Cast Metal Fittings, Cloth Sails, Rigging Sailing or Radio Control. Construction is un­ Cordage, Mast and Boom Material, Metal Rud­ believably simple. Inter-notched Die-Cut Frame der Metal Keel comes with Lead Ballast cast features Plywood for strength and long life. in place. Step-by-Step Plans show simple as­ Printed-planked Deck is die-cut and ready to sembly as well as operating instructions. Base slip into the Rub Rail molded into the sleek shown not included.

STERLING MODELS e 3620 G- ST. PHILA., PA. 19134. KIT B24 $24.95 It no dealer available, direct orders accepted —with 10‘* additional charae for handlinq and shipping (60< minimum in U S.. $1.25 minimum outside UiS.) □ Catalog of entire lne of airplane control ine model kits. R/C scale HEIGHT 4 3 " and Trainer kits, boat model kits, accessories, etc 50* enclosed Secrets of Model Airplane S uiting Including design, co nd u c­ tion, coven no. finishing, flying, adjusting, control systems, etc. 25* enclosed LENGTH 3 4 " "Secrets of Control Line and Carrier Flying." Indudng preftght. soloing, stuning. Carrier rules and regulations. Carrier (tying hints and control line installation instructions 25* enclosed. No BEAM 6 '/*" checks Only U S. money orders or currency accepted Name

State

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ΈΜ MODEL BUILDER SENT YOU! The article is entitled “ Where Has It Gone?” The author was Capt. John 10’ SPAN Wisda, Los Angeles Flight Operations, and wherever he is today, we’d like him to know that we admire this piece of 1/4 SIZE CESSNA 310 TWIN material more than anything else we have ever read. In our business, we concentrate upon riveting metal to metal and wood... forming pipes, tubesand conduits to des­ ignated shapes. . . adding miles o f wire in planned systems. .. designing dials, knobs, switches, levers and pumps for definite purposes... and then bolting the whole mass together in a single unit. Then we take this object—an airplane —and shove it through the air as fast as it w ill safely go. (When this is accom­ plished, we design one even more com­ plex and push it even faster). The route along which this machine travels is determined by computer; the altitude is chosen by schedule and econ­ omy; the grace to go is given by the friendly Aviators Association. • Fast Assembly • Moulded Cowls • 3 piece wing A massive, mechanized operation but • For .60 Engines • Flies Like A Trainer • Machine Cut Parts • Rolled Plans • 120Vi" Span • Designed and Produced with the one component missing that • Hardware • 18 lb. Flying Weight By Bud Nosen made flying the wonderful thing it is. Romance, / guess you could call it. An almost exact copy of Cessna's popular Twin Engine aircraft. Designed by Bud Nosen, flight tested Last week, a seven-year-old boy on the and modified to provide the smoothest flying kit of its kind on the market. Large lateral area makes the airplane turned to his mother as / walked loss of one engine hardly noticeable. Engines over .60 not recommended or needed. by and said: "Mother, is that the driver?" "Driver?"I thought. "DriverI Where Write for BUD NOSEN MODELS has the time gone when every seven- our illustrated year-old boy around called a pilot a pi­ catalog -25? 522 15th Ave., Box 105 C, Two Harbors, Minn. 55616 lot—and with a capital P? "How long ago was it when the pilot sat tall in the cockpit o f his open bi­ Workbench . . . . Continued from page 4 plane, with all the young lads hanging on the airport fence, open-mouthed in readers. . . and advertisers, who have complete awe? How long ago, when, taken the time to offer constructive cri­ bumping over the dusty tarmac and ticism. We haven't adopted all of the climbing into the sweet, pure air over the ideas, but we’ve sure considered all of windsock and battered hangars, the flim ­ them. It’s nice to know that there are sy crate of wood and doth was trans­ people who care enough to compliment formed into a thing of magic by the pilot us on our e ffo rts. . . it ’s much easier at the controls?" to issue complaints... or nothing at all. « We have the feeling that many of you A man's ref lections o f ten return to his consider MODEL BUILDER to beyour years as a small lad. Mine concern the magazine . . . and we can’t think of a early 1920's, in the small town o f Raw- better compliment than that. tins, Wyoming. Located along the Union WHERE HAS IT GONE? Pacific railroad and the Lincoln highway, Way back in February o f 1967, the it was also on the old air mail route. Valley Forge Signal Seekers, an R/C On many a dear day, in our knickers club of suburban Philadelphia, Pa., pub­ and sheepskin coats, we would climb the lished in their “ Hear Ye” newsletter, hill behind my home to be doser to the suspension system problems. This pre­ then edited by Bob Lamey, the following mail plane as it soared overhead in the sentation o f suspension systems cannot article. It was originally (as far as we afternoon. A boy's mind could be easily really be concluded until a working and know) printed in the Nov./Dec. 1966 mesmerized by the sun bathing the pro­ proven system is developed for R/C cars. issue of “ United Shield," a magazine peller in a translucent whirl. The sound I have had personal experience with a published for United Airlines employees o f the old Liberty engine, the hum o f the rear suspension system (1974) and rock­ and their families. Bob “ swiped” it from flying wires and the view o f the pitot in er rear ends (1975), but can only give an office magazine rack and obtained the cockpit were unforgettable. Occasion­ you my impressions of front suspension permission to reprint the article. We ally the p ilo t would wave and we would systems, since I’ve never used any. have kept it in our files ever since, and wave back. The day was complete. That’s it for now. Hope to see you have, on various occasions, reread it On cold w intry days when the wind all at the 1975 ROAR nationals Aug. 20 word for word. Each time we do, it cap­ was whistling and the snow was pollut­ to Aug. 24, 1975, at Rattey’s Raceway tivates our mind all over again . . . as if ing visibility, obscuring all except short in N. Attleboro, Mass. I’ve heard some we were reading it for the first time . . . distances, we would go with our dads interesting things about the track ... and each time, as we read the closing to the train depot. A t the scheduled time banked turns, WOW! Hope the locals paragraph, the familiar lump comes up or, sometimes, later, we would see that don’t chew us up into little pieces! · in our throat. same biplane with frozen pilot, crouched

6 0 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER down out o f the raging weather, thread­ ing his way right on top of the railroad —the old "iron compass"—flying so low that he had to increase altitude to miss the semaphores. Completely dedicated to NEW Grand Banks Dory his profession ... loving it ... absorbed in trying to stay alive. All colors preprinted on coated heavy paper. All die-cut Later, / learned that those pilots knew cardboard parts. Easy assembly, in 6-8 hours, every bend in the railroad, the location with illustrated step-by-step instructions. o f each semaphore and the altitude in m Building an authentic scale model feet—not hundreds of feet but feet—of ,f of the Grand Banks Dory is an every mile o f track along the route. They ,*! exciting learning experience for had to. / teenagers and adults. The con- (It was cold in those cockpits. The / / [ 'j struction technique involved is only heater was the alcohol heater. A . similar lo that of full scale boats. trip from Laramie to Rock Springs con­ Hfck Learn of the dory's historical sumed a fifth). / use and development. Then the era began to change, first slowly and then rapidly with the advent | 1 IjL The Grand Banks Dory's o f light beacons, radio, closed cabins, . /m ø measurements are: LOA 10&fe ", de-icers, retractable gear and on and on. i* Beam 3 - 1 /1 6 '. The complete With each change, it seemed, a little b it / f a i t * / kit price is $2.49. o f the romance began to die. Available through hobby dealers What excitement there still was, and distributors only. though, in the early days o f the DC-3, - ~ L . with the primitive ranges, inadequate de­ icers, short runways and the like. To make an instrument approach on a snowy day had its most interesting moments: "A "is on the left, " N " is on the right. Initial approach over the radio range is 3,000 feet. Check over the range, gear down,green light, pressure up, hydraulic fuel okay, one-quarter flaps. How much ice is on the wings? Carburetor heat 75 degrees, speed 120 mph. Fly out for the procedure turn. " A " is now on the right. Make the turn and let down to 1,900 feet. Now “A " A ll the fury o f the Alm ighty shaking our "Ma'am, there is only one Being who is back on the left again. toy airplane like a baby's rattle. Pencils can do anything about it and / have just and flashlights flying around the cock­ had a long talk with Him." Is there more ice on the wings? Re­ * · check the altimeter, hold 7 degrees left pit; radio too full of static to be of any So here we are, in a pressurized cabin crab. Open the window, scrape the ice use. So, down on the deck, 1,000 feet six miles above the earth. The storms o ff the windshield with the putty knife. above the ground—and you'd better and ice and hail are far below. The steak Are the de-icers working? Ice thrown know how high the ground is. is too well done, the wine is the wrong from the propellers is hammering the Follow the light beacons. Where is fuselage. the railroad? Stay on the right because vintage and the air was a little choppy Over the radio range again, final ap­ there goes another airplane . . . and an­ for 10 minutes about three hours ago. proach. Three-quarter flaps, speed 100 other. A light in a farm house down be­ Beneath us is the Platte River along mph, let down to 1,100 feet, turn to a low . . . probably some farmer reading which lies the whole history o f travel heading of 020 degrees, count off the his evening paper. / wish it was me! across our great nation. The Oregon seconds to 19. During a lull, / make a trip to the pas­ Trail—we go farther in one minute than How much snow is on the runway? senger cabin to survey the damage. A they did in one day—then the Pony Ex­ How high are the snowbanks along the little old lady asks " Can’t you do some­ press, followed by the stagecoach, the sides? Will the cross-wind force me thing about this rough air?" And / reply railroad, the open biplanes and now us. sideways into one? W ill the braking be good enough to get this thing stopped? There's 19 seconds—where's the field? MOVING TO SOUTHERN CALIFORNIA? There it is! Full flap, power off, slip it a little, wing down on the left and now MAKE SURE YOU GET A HOME slide sideways down the runway. The WITH A MODEL WORKSHOP ! ! fence is getting bigger as she slows—and FOR ALL YOUR REAL ESTATE NEEDS, CONTACT: then all motion stops in time. Whew! It was customary then to walk into ANITA NORTHROP the office and, when the dispatcher asked “SE HABLA ESPANOL!” "Rather rough today?"reply "I couldn't really say. I slept through most o f it, the SPECIALIZING IN: (714) 979-1050 stewardess made the landing." RESIDENTIAL (714) 538-9625 And those massive, beautiful thunder­ COMMERCIAL GnhJgk. Office at: storms, expressing the power o f 50 atom­ INDUSTRIAL 688 W. Baker St., ic bombs. Hail bounding o ff the tin, St. Elmo's fire ringing 'round the propellers, LAND REAL ESTATE Costa Mesa, Ca., 92626 bolts o f lightning dancing across the sky.

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 61 because surprisingly enough, there are a number of reader letters, and especially Greatest Book of club newsletters, that are still addressed FULL-SIZE RUBBER FLYING to MB at 12552 Del Ray. It is only be­ SCALE PLANS, plus cause our personal mailman, Roy, recog­ nizes the problem, that we still get this building, trimming, and SCALE MODELS mail and tote it to the office the next flying instructions ever day. published! OF W W II Obviously, when we move away from Santa Ana, and into a new postal district, the P.O. cannot be expected to forward Twelve half-inch scale O o mail from an address that was changed rubber powered flying 2-1/2 hears ago! Please folks, MODEL models by some of the BUILDER is at Box 4336, 1105 Spur­ 12 FULL SIZE PLANS geon St., Santa Ana, CA. 92702. world's best modelers, • (MUMMAM M f WILDCAT DIRTY DAN TAKES OVER »8IM W U II W MILL CAT including Doug Mc- • VOUQMT Beginning in this issue, we have a new IW TW M tl Zt AO F Hard, Clarence Mather, Control Line editor, Dan Rutherford, • SUrCAMAHMf V 1TTIA I 920 240th St. S.E. No. 1, Bothell, Bill Hannan, Bill War­ • FOCKf MULT TA.IU • M U . Μ · AIAAOOMA Washington 98011, a suburb of Seattle. • CUftTttSMOC ner, Bob Peck and • MID TMUAOf AAOlT Known as “ D irty Dan” by his associ­ • M W MUVTAMO ates, not because o f his personal clean­ others. • COVfMMK} AMO TRIMMI» • MARINO IT FLY liness or dressing habits, but for his ruth­ less tactics in Combat, he is an active Compiled and pro­ FEATURE ARTICLES ON yo-yo flyer and is in constant touch with duced by I.E. Coleman, ALL 1/24 SCALE BUILDING, FINISHING, AND his compatriots around the country. He FLIGHT ADJUSTMENTS. is also the Control Line Contest Board edited and published representative for District XL by Model Builder Ma­ AVAILABLE NOW - $ 7 « Dan has some great projects in the gazine. works for future columns. Also, he SEE YOUR HOBBY DEALER. OR ORDER would like to hear from our readers, DIRECT. ADD $1.25 FOR FIRST CLASS. especially those with interesting photos CALIFORNIA RESIDENTS ADD 6% SALES TAX. to share with others. Write to him direct­ FLYING ly at the above address, or c/o MODEL Box 4336, BUILDER. · SCALE MODELS Santa Ana, Ca. 92702 Ms. O n ly ...... Continued from page 24 by the many spikelets, the longest of What comes next is conjecture. right, but there may never be a clear cut which is called an awn. Mr. Nelson at The vehicles o f travel were important answer because it seems to depend upon the Center. . . he happens to be a grasses and so were the men who handled them. various definitions o f what event was b u f f . .. showed me drawings and gave Each complemented the other; one w ith­ properly called the Nats. Anything be­ me information galore about the offend­ out the other was nothing. First the oxen fore 1936 was before AMA existed. er. Finally he put a Hystrix patula under driver, then the stagecoach driver, then NAA (National Aeronautic Assn.) was his microscope to show me the barb on the p ilo t and now the airplane driver. the governing authority then so we’re the awn and the saw-like edges on the It all passes, as we too must pass. / digging further into their records to find spikelets. No wonder getting them out is can only say that when / make my last a better answer. all handwork! I was disappointed that flight West / will know that I was a part "In the meantime, the 1975 Nats is this little rascal is found only east of the o f it—and it was a part o f me. being recorded as the 44th at present Mississippi. Again Mr. Nelson came to ABOUT THOSE EARLY NATS since that number is consistent with all my rescue and assured me on the other Following our editorial concerning our past WWII records.” side o f the Mississippi you have a grass what year the Nationals actually started, WE’RE PACKING o f the same genus called Hystrix califor- we received the following letter from Hopefully, by the time you’re reading nica. The only difference is this has the John Worth, AM A’s Executive Director: this, MB’s editor and his family will barb on the point. So they get you “ Dear Bill, have moved to a new address in Newport coming or going all over the United Your July ‘Workbench’ is misleading Beach, California. States! concerning what AMA claims as the first The main reason for bringing this When I was first married, I picked all Nats. We don’t say Detroit in ’28 was more or less personal business to the these little nature things out and off. the fir s t. . . we say 1923, just like Bert attention of our readers has to do with After a few years o f this, plus a generally Pond claims... the forwarding o f mail. MODEL BUILD­ rotten day, I decided the heck with it. "There is a problem, however, con­ ER Magazine was born in the family I threw the clothes in the washer... cerning what happened between 1923 room o f our residence at 12552 Del Rey seeds, stickers, burrs and all. Everything and about 1935. For example, an ex­ Dr., Santa Ana, California. As it grew, came out beautifully, Old Hystrix was cerpt from National Aeronautics maga­ it spread to the living room, and finally right there, dust free and glossy, embed­ zine for June 1937 says that the ’37 to all but one bedroom . . . and then, ded deeper than ever. Maybe you’ve done Nats was the 12th annual. And the late along came Belinda. In February of the same thing and you begin feeling Willis Brown, who was AMA Historian, 1973, MB was moved out o f the house remorseful and don’t have the heart to has the 1937 Nats listed as the 10th. and into offices at 1900 East Edinger, put the pickery things in his sock drawer. But Bert Pond, who took in all or most Santa Ana. A year later, it again moved I did. o f the earliest Nats, says that 1937 was to its own building, where it still is Something happened later that night the 15th! (that sure counts up right, today. (Though things are once more to make me realize I had to go back to wen) getting somewhat cramped). my picking. I was lamenting my short "We’re researching to find out who’s We mention the forwarding of mail, supply o f liquid stuff needed to remove

62 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER my artificial finger nails. I had six o ff and four to go. It was Sunday night. Nothing was open. Bill sniffed my little empty bottle and nodded. He produced a gallon o f Sig dope thinner that worked beautifully. We were buddies again. I hurried right to the bureau and did a fast sock job. One other time I had a major run-in with my friend Hystrix. I was sitting on the floor near the washing machine pre­ paring to “ pick socks,” as I call it. Be­ cause o f my near sighted problem, I had my glasses o ff and a sock very close to my face. I was having a daydream somewhere between being an Indian Squaw and being in the Little Red Rid­ ing Hood Fairy tale. I was thinking, “ The better to see you, my dear Hy­ strix, ugh!” Suddenly my son, who was supposed to be at college, appeared in the doorway with several “ house guests” and said, "... and this is my Mother.” But you can’t go on feeling sorry for yourself for ever. I ’ll admit that some­ times I’m struck with a definite feeling o f jealousy. A t these moments I wish and long and hunt for a hobby that will consume me. “ Why can't I,” I ask my­ self, “ be crazy wild about something?” I do have this thing about eating out, but one could hardly call that a hobby. I have lots o f things I like to dabble in, but I simply cannot stretch them into / \ anything that would remotely compare • Schneurle Porting with my husband’s love affair with mod­ • Double Ball Bearings eling. • Silencer System with inserts for I thought nature study was going to adjusting noise level to fit local be the answer. At every contest, shortly requirements. after the first crash, I ’d strike o ff down • Heavy Duty Construction the little road or through the woods to — No Castings observe nature. Sometimes nature hap­ • Precision machined — pens right before your eyes on the con­ no gaskets needed test field. I witnessed a spider hatch, • Automatic mixture control where billions o f minute spiders were carburetor throwing themselves about on tiny gos­ SILENCER SYSTEM SUPPLIED Send lor additional information samer threads. I was o ff to the Nature v ______y Center again, but the patient Mr. Nelson AS STANDARD EQUIPMENT told me all spiders do this, and the only ^ AVAILABLE AT YOUR FAVORITE DEALER amazing thing was that I hadn’t w it­ nessed it before. I have the distinct feel­ ing that if he sees my orange car pull up / v ? m s o iii m o del p r o d u c ts again he’ll be out the back door and 6929 WEST 59TH STREET · CHICAGO. ILLINOIS 60638 · (312) 586- 7101 down the wilderness trail muttering, “ Flake!” During my nature phase, I made sev­ racers and the kids went happily back know enough to stay way back from the eral attempts toward starting a Critter to jumping over wings in the pit area. Hystrix patula! · Race at our local contest. This is an out­ Cheryl’s philosphy is the best. Enjoy. right steal from the Mint julep contest Have you never dreamed about taking Remotely .... Continued from page 16 held each May in Rough River, Ken­ over the controls? I have. I picture my­ decorations, swimming, fresh pineapple tucky. All my tries were failures. We self on the top o f our local great sand from Hawaii, real rocket style fireworks, either had kids aplenty (mostly boys) hill at Warren Dunes State Park. Many and over 100 guests. but only a handful of critters, or we of Bill’s glider pilot friends are there “ By Saturday morning the lovely were loaded with critters, but only a few watching him expertly hunt the lift with ladies in the concession stand looked willing kids. Have you ever been in a his King Kong. In my minds-eye it is like angels from heaven as contestants field that’s the home of countless cater­ always a very windy day. Small People preparing for the Quicky races viewed pillars? They were in our hair, in our Warnings are out! I step up casually them behind the coffee pot through food, on the lawn chairs and even in the and say, “ I’ll fly for awhile, Bill.” Bill their road map covered eyes. Five rounds impound area, without a frequency clip. smiles and confidently hands me the o f racing took place for 43 flyers, and They collected them by the paper cupful transmitter. Somehow it ’s very hard for the lunch break was highlighted by a and deposited them where they would me to daydream beyond this point. One Bicentennial flag ceremony before a ga­ evoke the shrillest screams. But alas, thing I know for sure. If I were standing thering o f spectators to commemorate the furry things are poor and sluggish in his shoes, or I should say socks, I’d the beginning of a year-long series o f

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 63 tion ... JAMAICA! See you there!” VL-101 ELECTRIC FLIGHT SYSTEM ON QUARTER MIDGETS F e a tu rin g We think the following letter from HYTORK 48 Bill Cooper, Quarter Midget Vice-Presi­ MOTOR & PLANETARY GEAR UNIT dent o f the NMPRA, addressed to George Complete Hying weight 2VS oz.------w ill power Zink, editor of the Metropolitan Air t >1 M odels 25 to 50" wingspan weighing up to 10 oz. Racing Association (New York) news­ » Send 25é for Catalog showing com­ letter, says quite a lot, and we quote it plete line of Electric Flight Equipment completely. and Accessories “ Dear George > VL-101 System $19.50; Hytork 48, Prop and Instruction Book $9.00; Fast “ I would like to comment on some Chargers $14.50 to $29.50 general beliefs and what I consider mis­ > See your Model Dealer or order Direct conceptions about the ‘real experts’ in PRODUCTS (add 10% for Postage and Handling - Quarter Midget competition. These were DIVISION OF VISTA LABS Calif. Residents also add 6% Sales manifest in your article about the recent 7023-D Canoga Ave. Tax) send Check or M.O., No. COD's protest at the MARA event. f Canoga Park, Ca. 91303 * Hobby Dealers send for Information “ As you know, I am 100% in favor of some method of determining whether or not an engine is stock. We have en­ INTRODUCING forced this rule for 2 years at the QM "HOOKER" Nats at Rough River (We disassemble $2.49 ADJUSTABLE "BALLAST-LOK" top five places). What concerns me is TOW HOOK $1.95 Λ that it is always the winner or the guy with the fastest time who bears the •STRONG PIANO WIRE HOOK •MOUNT FOR BALLAST brunt, whether it is a legitimate inquiry •FLIGHT WEIGHT 5.5 GRAMS •SAFELY HOLDS 16oz i or a jealous loser. We need the control, OR MORE but a simple RPM check with a common •DIECAST ALUMINUM BODIES prop might be a faster way to do a EASY FIELD ADJUSTMENT 'M preliminary engine check. A nitro check INCLUDES MOUNTING HARDWARE directly following a fast time will catch AVAILABLE AT FINE HOBBY SHOPS EVERYWHERE more cheaters in QM than everything ADD .35 POSTAGE AND HANDLING CA.IES. ADD 6 V. $ A L E S TAX \ else together. “ I am not saying eliminate this con­ HARDWARE MANUFACTURING AND ENGINEERING SERVICES AVAILABLE. trol, but use it with other measures: WRITE FOR INFORMATION. For example, a steward (he could be the SCOTT RESEARCH CO., P.O. BOX 22, COSTA MESA, CA. 92627 Starter) who checks props before each heat, and one person to fuel and defuel each competitor between the pits and I CLOUDBUSTER RACE WINGS 1 the line. There is no complete answer, but believe me, there is more to cheating than souping up engines. The average guy doesn’t know how, and the real ex­ perts can do plenty that is not readily noticed. “ I would like to bet that there are more rule-benders in the 4th, 5th, and R eplicas 6th place categories than the names you RUBBER SCALE PLANS FOR SIX (6) Μ Ε Λ Α / free f l ig h t see finishing 1st, 2nd, 3rd with regu­ FLIGHT-PROVEN, RARE & UNUSUAL b v v IHARDWARE larity. Watch how often a fly-off for RACING PLANES. CROSBY, FLOYD Winding the lower places will result in a drasti­ BEAN, TWO FOLKERTS, SMIRNOFF Hooks, Etc. cally reduced time for one o f the com­ BEARCAT, and CHAMBERMAID. Complete set, postpaid, only $4.00 For complete catalog and FREE petitors, with no obvious decrease in pilot performance. Watch for the guy order from: Peanut Pilot send $1.00 to; CLOUDBUSTER VENTURE .-.JIM CROCKET REPLICAS,—ι with the squeeze bulb in the pits and P.O. Box 2921, Livonia, Mich. 48154 J 1 4 4 2 N. Fruit Ave„ Fresno, Ca. 93728 C shiney props, in addition to the winners and runners-up. "One final observation regarding anniversary happenings planned through ‘‘Everyone went wild over the beau­ good engines ‘falling’ into the hands o f 1976. tiful and unique hand-painted statue­ the experts. George, I don’t really think “ The final gathering for the awards like trophies that were sponsored by this happens. My 1:47 was turned with banquet at the Latitude 20 was a fitting Bill and Anita Northrop and MODEL an engine that turns a 7-5 Rev-Up 17,200 climax to months o f hard work and a BUILDER Magazine. First place statues to 17,700. Right after I flew a 1:56 week o f good fellowship and competi­ had the added dimension o f u tility, as (for 11 laps) at Rough River last year, I tion. Carson Parks and Recreation Di­ they were crowned with electrical works was confronted with an RPM check rector Howard Homan and Recreation and a lamp shade. (idle and top end) even though a power Superintendent Ed Ricci were among “ Before the Latitude 20 floor show on landing was made. Idle: 3800, top the distinguished guests, and Mr. Homan started, Larry jenno announced next end 16,800. One o f the contestants told the 140 people present how he had year’s Annual Vacation Fun Fly, which could not believe it, and in fact bor­ literally laid his job on the line to help is guaranteed to surpass your wildest rowed another tach to verify it. My us retain our flying facility in the face dreams. Start saving and planning now, point is this, the real winners in QM of pressures and complaints from a few and watch these pages for an announce­ (Austin Leftwich, Fred Reese, Dan Kane, local residents. ment of the dates and details. Destina­ Bob Blouch, Gail Jacobsen, and many,

64 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER many others) do it not by modifying engines, but by very patient engine break-in, hours of selecting proper props (I personally spend more time selecting props and recording values than I do building), and building superior aircraft that will go fast with mediocre engines. They also fly very close to the pylons. All things being equal, the proper prop selection separates the men from the boys in QM, not the other things. There too many good aircraft designs and supe­ rior pilots o f equal ability.” * * * The following report comes from Dick Scamehorn, editor for the F.O.R.K.S.: ‘‘The Fairfield Ohio Radio Kontrol Society (F.O.R.K.S), an A.M.A. char­ tered club located in Lancaster, Ohio, held its annual Invitational Quarter Mid­ get Pylon race on Sunday, June 1,1975. Jim Slater, well known as an active R/C’er, was contest director. Competi­ tors this year included representatives o f the Delaware Model Airplane Club (Del­ aware MAC), Mentor (Ohio) Area Radio Control Society (MARCS), Fort Wayne (Indiana) Flying Circuits and local mem­ bers from the F.O.R.K.S. This one day event in the past has had several dozen contestants, however, severe thunder­ storms on the preceding day and even­ ing limited the contestants this year to a total o f ten. ‘‘The race was staged in ten rounds with three heats per round, racing the standard two mile pylon course. Three planes were competing in each heat, RACEPLANES with a maximum o f three points for SCALE PLANS first place, providing the winner made by WESTBURG a smooth landing with engine idling. Travel Air 2000 (2 Sheets) Unacceptable or dead stick landings re­ 1" = 1.0 Ft. $4.00 sulted in a deduction of 1/2 point. ‘‘Bill Weesner, from the Ft. Wayne Waco ATO Taperwing ( " ) Flying Circuits, took first place honors, 1" = 1.0 Ft. $4.00 edging out Don Love, from F.O.R.K.S., Blackline prints, 30"x42”, mailed by a narrow margin, as Bill won his SC A L E DWGS ninth round heat, head-on-head against folded in No. America. Add 50έ per Don. A.E. (Ed) Nobora, from MARCS, Quick easy reference brochure identifying over set for First Class & 65έ for Air Mail. captured third place. Weesner’s hottest 700 Raceplanes, 1908 to present. For rolled prints, add $1.00 per order. single lap as 11.1 seconds, or a lap speed Send 50< for Brochure to: Send S. A.S. E. for complete list. exceeding 65 mph. But that wasn’t B ill’s ‘big show’ o f the day. Going into the R S HIRSCH 8439 Da,e St· PETERW. WESTBURG 834 Seventh St., No. 6 tenth round, Bill needed only a 1/2 Buena Park, Ca. 90620 point to tie Don Love; which he could Santa Monica, Calif. 90403 get by just finishing in 3rd place, even with dead-stick landing. A third place two years), it is probably one of the to help support the wing hold-down with 1/2 point for landing or a second most “ R/C-able” old timers ever to ap­ rubber bands, undercut the center and place would win the meet for Bill. Well, pear. first ribs 1/16 inch so that the first bay Bill won his tenth round heat, took a Activating the tail surfaces is a simple can be sheeted. 180° turn to line up for a victory roll matter of substituting two 3/16 sheet We’d also suggest adding a filler piece over the field . . . and his plane crashed spars in place of the single 1/16 sheet to the trailing edge where it is held down . . . the airborne battery pack was dead! spar shown. Build the surfaces in one by the wing rubber bands, otherwise All the observers agreed, Bill couldn’t piece, placing the spars 1/16 inch apart, the “ reflexed” airfoil could be damaged have made another lap if he had to make and cut them apart after the glue is dry. by rubber tension. up a cut. Bill’s flying, not luck, won the Fill in between the sheets where you The “ Pursuiteer” suffers a little as match; but his bad luck came just late intend to put control horns. far as the O.T. rules for glow powered enough so it wasn’t a problem.” · As for the wing, the box spar is, in models. According to the .10 cubic effect, a top and bottom spar, with web­ inch/225 sq. in. rule, the max displace­ Pursuiteer. . . . Continued from page 31 bing front and rear. We’d be tempted to ment allowed is .249 (a Veco 19 or ST signed and built almost 40 years ago increase the top and bottom pieces with 23), which ain’t very much for a plane (when published, it had been around for hard 1/8 sheet balsa stock. Also, if only this size . . . In fact, it’s downright un-

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 65 INEXPENSIVE FUN-FLYING IS BACK- WITH .074 & 11 OVER SILK or TISSUE ALREADY COLORED T f u m d e r / m d K & B DOPE (Butyrate) K & B DOPE (Nitrate) The finish coat The perfect base coat ENGINES specifically formulated for tissue and silk. to apply over colored Formulated for use tissue or colored silk with SUPER POXY INCLUDE:TANK*EXTRA where paint is not to CLEAR or one or more be used. Protects, of the 33 colors of GLOW HEAD-WRENCH Beautifies, and SUPER POXY PAINTS Strengthens as the which provide a fuel- (PROP NOT INCLUDED) cover "firm s” up. proof, glossy finish HOT F U E L Easily brushes on. NON FU E L that knows no equal. PROOF Fast drying. PROOF

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FLIP START 57.95 PRESSURE FITTING c o n ­ U NUT PLATE For all .61 en­ vert any DOMESTIC .19 gines. Pre-dri I led and tapped thru .40 disp. engine to with 6-32 thread. Fits under pressure fuel injection by hardwood beam engine mount. utilizing crankcase pres­ Cat. No. 6505 ...... B la n k MUFFLER for sure. Cat. No. 6723 Cat. No. 6506. .Drilled & Tapped VEC0 -19R/C Series 71’ K&B RACING Considerably reduces exhaust noise. Conforms with standards now being NEEDLE set at many of the airfields. Simple VALVE Å to install. f Has a 10-32 thread. Rugged in construction I ASSEMBLY » it fits all engines .15 to .60. Cat. No. 7738 Cat. No. 6507 KB-1L& KB IS K&B GLOW PLUG #= GLOW PLUGS W/IDLE BAR The KB-1L (long /ΤΎ£ύ \\ for controlled en· reach) and K8-1S iS S tijrU gine speed and a RECOIL START 58.95 (short reach). required given FoulDoed with a i 1 speed up to a con· S-MJ newly developed • 'fc r T stant maximum — Dlatinum a l l o v is * ' for R/C, Carrier, wire element. Su- and Scale Flying. perior to coil In Note: Oo not exceed Ι'Λ volts. any other plug. Cat. No. 4520 (long reach) Cat. No. 7311 ...... K B -1 L Cat. No. 4530 (short reach) C a t. No. 7321 ...... K B -1 S K&B FILTER — R/C Cars R e p la ce ­ able polyurethane foam filters. Per­ mits full intake of air while filtering UNIVERSAL out all harmful dirt. Four to a package. NEEDLE Finer adjustments. Better fuel mixture. Easier start­ Cat. No. 6504 VALVE ing. Fits engines from .19 thru .35. Cat. No. 2918 OTHER K & B ACCESSORIES K&B ALL PURPOSE GUN Finger-control. . . a must for every modeler. Apply glue where you want it. C a t. NO. 7031 ...... 1 / 5 0 2 . RECOIL START 59.95 C a t. No. 7221 ...... 2 / 5 oz. C a t. NO. 7231 ...... 1 02.

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reasonable! One solution would be to Replica, second in 30 sec. Antique, third add one rib bay to each panel, or 50 in Class C, and first in rubber. Wow! FLIP START 58.95 sq. in. This would allow a reasonably Some guys are rough. Between Norman SPARE PARTS sized .29 or .30 to be used. and Oslan, they took home over 1 /3 o f T Glow Head-3 for $2.00 Close inspection o f the photo would the trophies! 'l l ’ Glow Head-3 for $2.50 seem to indicate that the landing gear One sad note to report at this contest 7’ Recoil Starter.... $1.50 was shortened some when the final plans was the absence of "King Otto” Bern­ 'l l ’ Recoil Starter $2.00 were drawn. The struts do look a little hardt, as he is affectionately called by BLUEBOOK OF HOBBIES CATALOG long, so this is a worthwhile change. his myriad admirers. It appears that the 160 TABLOID-SIZE PAGES $3.95 Old Timer Pylon Races anyone? · “ King” will have to undergo immediate DEALERS/WHOLESALERS surgery, thus cancelling all his and the WRITE: POLKS 346 BERGEN AVE. Plug Sparks. . . Continued from page 31 fam ily’s plans for the trip to the SAM JERSEY CITY, N.J. 07304 for) and this system proved much easier Championships at Denver. We all hope on everyone's physical stamina, not to to see Otto on the field in time for the POLKS HOBBIES mention nerves. SCIF meet on August 22. 314 Fifth Ave., NY., N.Y. 10001 Dept»« In a review o f the places taken, Bob FUELING AROUND Oslan did very well, with first in .020 Since the columnist has written sev-

66 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER eral artides about ignition and the pos­ sible fuels and oils to use, he has been receiving quite a bit o f commentary. The latest letter (and package!) con­ DU-BRO tained various type oils and directions for their uses. Seems that Bob “ Fritz” " SNAP-ON" Schafer, former SF Vulture, and jr Pterodactly Club member, now residing in Spokane, Washington, mixed up some various synthetic oils to attain an ap­ B A L L L IN K S proximate SAE 70 wt. oil. He calls it the Schafer Super-Slick oil, and it really , lives up to its name. t Tried as directed, in three-to-one and — . J four-to-one mixes, the w riter’s Veco 50 ______u (2-56 THREADED COUPLER INCL) converted-to-ignition engine ran and BOLT-ON LINK idled as never before. Best part about This 3-piece ball link set (No. 180) it all was that the engine did not sag in is a must for all helicopters and is power nor fail to use all of the fuel. readily adaptable for rudder, elevator Fritz is a Chemical Engineer with and servo linkage on R/C planes, boats or cars. Ball jo in t action Standard Oil and in his position o f re­ eliminates binding and is neat and search in the laboratory, he has been clean in appearance. O nlyg5< able to draw some excellent conclusions. First o ff, regardless o f all other THREADED FOR 4-40 ROD OR BOLT claims, standard unleaded gas is the best • TOUGH NYLON LINK SNAPS-ON for power and economy in ignition en­ AND HOLDS TIGHT gines. He looks in askance at Coleman lantern fuel, as it has a lower boiling point, hence a lower Higher Heating Value, the factor that tells you how THREADED LINK 5-Piece ball lin k set (No. 181) is much energy you get out of a given fuel. excellent for off-set steering, He also recommends, if you are really throttle and servo hookups. interested in getting longer motor runs Includes steel ball assembly w ith from a given amount o f fuel, that you 2-56 thread, washer, nut, threaded coupler and nylon ball link. try Solvent 51L, which is an industrial Easily adjustable. Onlyg5C grade o f Tuolene. With a boiling range of 223-250°F, and 91% acromates, Fritz 'AIRCRAFT QUALITY HIGH STRENGTH STEEL 1/8" TRIM ADJUSTMENT guarantees that if used up to 20% with W unleaded gas, you can’t help but get MAKES , longer runs. THROTTLE 1 This brings up an interesting point HQOK-UPS RIVET LINK SYI in the gas and oil controversy. The 4-Piece ball lin k set (No. 182) writer has seen naptha and other type for those who prefer a permanent fuels used in ignition. The question now installation. Includes nylon link, comes, are additives derived from petro­ threaded coupler, steel ball with pin and washer for peening on. leum eligible for use in gas and oil mixes? Absolutely no linkage play when If not, who is to tell when such an addi­ ball links are used. Nylon link TAKES CARE OF ANY helps reduce viabration and looks tive is present? MISALIGNMENT. Before everyone gets up on their high good too! Only 85< soap box and starts expounding about rule benders, let the columnist state that in economy tests, no great advantage was obtained. Matter of fact, the writer AILERON CONNECTOR & DUAL thought the economy was not as good, however, that is not to say, the engine TAKE-OFF BALL LINN was enjoying its best needle valve setting. 5-Piece set (No. 183) includes 2-way Anyway, think about it, fellas! nylon link, 2 threaded couplers. 1 steel ball with pin and washer TRANSISTORIZED IGNITION fo r peening assembly securely Although a considerable number of onto servo arm. For fast equal systems have been designed for running trim adjustments just "snap-off" ignition engines, none has been devel­ nylon link, twist in desired direction and "snap" back on. oped for use with radio. Tom Bristol has EASY! Also great for rudder- enthusiastically tackled this problem in nosewheel and elevator-brake conjunction with the writer. hookups. Only $ j q q Using an old Bob Long Cabin model of seven foot wingspan as a test bed, a Dennymite engine, and a Kraft Sport series have been installed. This is pro­ bably the worst combination you could DU-BRO PRODUCT! arrive at; a Dennymite has a terrible open air point system for electrical noise, INCORPORATED and the Kraft is one of the most sensi­ 480 Bonner Road Wauconda, Illinois 60084 U.S.A. tive sets to ignition disturbances. If we

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 67 heroes employed Robin Hood, (other­ Write For FREE BROCHURE wise known as Ed Novak) to retrieve the model. Cleverly looping the string On Our Complete Line Of over the tree, Ed walked the string R/C PROPORTIONAL EQUIPMENT around the tree and removed the glider. However, the tow hook caught and the in c lu d in g model slid down the string until suffi­ cient speed was built up to release itself. WORLD'S SMALLEST SUPERLIGHT Clever! Problem was that the model promptly circled back and again embed­ DIGITAL CONTROL SYSTEMS ded itself in the tree 40 feet from the SMALLEST SIZES LOWEST PRICES ground! After several arrows pierced the mod­ 13400-26 Saticoy Street el with no effect, George Judd took pity on Jack and climbed the tree to North Hollywood, Calif. 91605 recover the model. After a successful Phone (213) 764-1488 recovery, he found, upon arriving at the base o f the tree that he had lost his wal­ let and glasses in the high grass! Believe The historic T h e 1929 B f.llanca it or not, the next day, the boys, armed "S kyrocket* with scythes, cut all the grass and found the lost items! •4 25 T he Carmen also noted that the mylar g r i m i$t>- Afo*iocoufte covering on Ted Patriola’s Sailplane (win­ wingsran, o*» Fowes.ro« '* ■ '···■ ' 22 WJ- WLNGSPAN FOR ner, Pylon Gas) was just the thing for the F\0BJN3IN CONTROL UR TO THREE CHANNELS RUBBER. C0Í OR 010 POWER A BiT A MAOMTlCCNt AfMCXt 10* 0 » AH AU'IIM I J4 VJ~ WINGSPAN. .020 POWER OF NOSTALGIA AND A OCUOMT TO BUILO řAVOID T ( AIRCRAFT. FOR PLASE AMO SMALL MULTI rain, shedding water like the proverbial $ 7.9.5 RJkD,°C0NTR0L uwts CAN M a true classic prom theoolo en era" FLOWN FREE FUGHT ON RUBBER. duck. Most models exposed to the wea­ •UTS INCLUOi TOP QUALITY PRINTEO BALSA. OCCAl* ANO SUPER DC TAIL ther looked like dried prunes (lotsa wrin­ The kles). Without a doubt, the weather held S te a rm a n C 3 B ·"·*-' - ’ down the entries, as many came over a »"WINGSPAN. OAt POWER. FOR hundred miles only to pass up the chance CONTROL UP TO THIKE CHANNELS S2.

6 8 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER \\

H O T STUFF TM. GETS IT TOGETHER FLASH! 'HOT STUFF" IS NOW $5iZ2 PER UNIT FAST (Two large bottles) THANKS TO TREMENDOUS AT YOUR HOBBY DEALERS NOW \ WORLDWIDE MODELER DEALERS AND DISTRIBUTORS SATELLITE CITY, P.O. BOX 1935 CALL (213) 899-2301 ARLETA, CALIF. 91331 set and orders closed. The price will be $150.00. Sounds high? No way! Each CHICKEN HAWK engine is hand fitted, test run, and ex­ tensively engraved. The motors will be serial numbered (engine collectors will love this!), registered in the original U 4 a owner’s name, accompanied with an au­ thentication certificate signed by Bill Brown himself! All features o f the engine have been personally approved by Bill Brown. So, if you are looking for a gleaming chrome ■15-.23 plated engine fully covered with parts 1-2 Ch. All die cut parts, formed dural gear. Simple Construction. and service warranty, write to Herb’s Proven Performer $15.95 Model Motors, P.O. Box 31, Crum The Gentle Intro to Multi. All die Lynne, Pa. 19022. cut, formed gear, aileron material. Another easy-to-build kit $29.95 Want more than one? Okay, and you Special S ditio* “P I & h a save money with a three engine order S er your dealer or order direct. r. O . Bo. 2SS5. Sch .O M l.ay, N. r . 12509 being priced at $150.00 for the first, $140.00 for the second, and $130 for Jim Womack to find lost models and the third. Heck! It’s worth the specula­ then using a salt water boat to get it. tion alone! Lotsa luck! KLONDYKE ENGINES NORTHWEST "BIGGIE” The “ Klondyke” engines (K&B Tor­ Almost overlooked the announce­ pedo conversions to ignition) are being temporarily discontinued until the early ment in the Willamette Model Club “ Pat­ ter” Newsletter sent out by Al Grell, of spring of 1976. Mark Fechner says he the big Northwest O/T Champs on Sept. has so many requests you wouldn’t be­ 14. There will be nine events, with tro­ lieve it. When he finally gets caught up, he will announce resumption of the phies to third plus merchandise. A fea­ Klondyke engines. ture of the contest is the noon time SLAM SIGNALS break for lunch, pictures, and the special Beauty event. Contest will be preceded The Saltair O/T Champs held at the salt flats near Salt Lake City was a great by the4th Annual MECA Collectogether contest, according to Nicki Fechner, the and Old Timer night. This is a must! "Contest Directors-Director.” Nothing For dope, entry blanks, etc., write Jack like a backup, eh, men? Shafer, C.D., P.O. Box 322, Dallas, Ore­ jerry Sanford was the big winner, gon 97338. taking two firsts, one second, and one Bob Stalick has gone out on a limb F/F Scale . . . . Continued from page 41 third! An old timer hand launched glid­ and said it is about time we had some solder these onto the motor case in a er event was held for the first time, with good weather. He has put in a reservation triangular configuration (the apex of Mark Fechner coming out on top flying with Jupiter Pluvius to rain elsewhere, the triangle at the bottom ). Follow by a Charlie Belsky design (lives in So. Cal. so come one, come all! soldering 1/2 inch lengths of 1/8 inch now under Charles Bell). Lin Haslan . . . AND NOW FOR THE brass tubing on top o f these channels, proved it was a good design by using the GOOD NEWS . . . letting them protrude a fraction beyond same one to nose out a joe Hervat de­ Just before going to press, Marge the back o f the motor case. Retain the sign for second place. They should call Bernhardt called to say it is not time prop shaft using a wheel collet. The w ir­ Jay Jackson, "me too” as he came in for the toast, “ Long Live the King.” A ing is straight forward and shouldn’t be a second three times! Gotta change your successful operation showed the black problem. However, I would recommend luck. spot on the colon to be benign! Best using lamp wire, otherwise the resistance Rolf Onrstog came over the hills news this reporter has had in years. The could be great enough to affect the pow­ from Denver to win Antique, but un­ good Lord has seen fit to spare one o f er o f the motor. Keep the wiring as fortunately lost his Clipper over the Salt the righteous in modeling; what else but short as possible, yet provide enough Lake. Mark Fechner will be flying with a leader in old timer free flight! Amen! · length so that the batteries can be moved

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 69 for rigging biplanes, or models like the SUPER QUESTOR RCM NEW ERA III GRAND ESPRIT > Caudron. That in itself isn’t all that

ANNOUNCING A NEW STANDARD IN spectacular, but rather, the way that it STANDARD CLASS RADIO CONTROLLID S AILPLANSS is attached to the model. Typically, one common way to use this type o f material is to use 1/16 aluminum tubing, say AQVthA about 1/4 inch long, slip one end o f the ■' Ipronouitcad ak.kaal.afc) cable through the tube, the same cable end around an attach point, then back For Therm al or into the tube, then the tube is crimped. Slope S oaring The same is done to the opposite end, pulling the cable taut before crimping. STANDARD Well, I’ve modified this same procedure 8Vi FEET OF BEAUTY AND GRACE by using very small wire insulation in­ $59.95 WHICH FLIES AS WELL AS IT LOOKS stead of the aluminum tubing. You ob­ DESIGNED FOR 1975 NATIONAL viously can’t crimp this material, but a SOARING SOCIETY RULES TECHNICAL OATA drop o f Hot S tuff on the wire and tube WlngSpan 999 och#e Full Flying SlaMaior end Aiddor keeps it locked forever. The reason that WkngA/oa 810 *q >n (5 63»g

70 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER worth the effort. One interesting thing that can be done with this product, which the plastic fraternity does quite T h e often, is that Liqu-a-plate can be rubbed to whatever degree o f sheen or shine you want. On plastic, it truly looks like metal. You ought to try to get a hold of some o f this unique paint and experi­ ORDERS CLOSE ment with it. I have used it over doped OCT. 31, 1975 FOR tissue with excellent results. It is ex­ BROWN JR. THIS COMMEMORATIVE, tremely light, considering that it takes LIMITED EDITION very little material to cover a job. ENGINE. Once painted and dry, each cylinder SNC/Nf was Hot-Stuffed onto the “ crankcase” (exhaust forward) followed with some epoxy for good measure. The engine PRICE DEPOSIT was attached to the Hytork motor using 1st Engine $150.00 $70.00 HERB’S MODEL MOTORS a contact type cement. I did have to 2nd Engine 140.00 60.00 P O BOX 31 C R U M LYNNE. PA 19022 make a small extension for the prop- 3rd Engine 130.00 50.00 shaft since the exhausts were in the way. Place my order fo r. . (lim it 3), 40th Anniversary Brown Jr. Engine(s) I did this quickly on my Shureline lathe, at a total cost of $ . _____Deposit of $ ______is enclosed. but using a piece o f brass tubing and a NAME ______couple of washers would work just as well. Rubber grommets at each screw SIGNATURE location can be used, or even an “ O” ring slipped over the rear o f the motor ADDRESS__ would work for easy thrust adjustments. CITY. STATE ZIP. In the "w hat’s new” department, both Sig and Peck-Polymers have colored Ja­ panese tissue. This is the good kind. How long the supply lasts is not known. BETTER Therefore, it would be a good idea to write to them for further information THAN A as to color and price. Vintage Aero has added several 12 e WORKING TURNBUCKLES THIRD • RIGGING & CONTROL CABLE inch span Peanut scale models initially -*.· CONTROL HORNS designed by Megow, National, Dallaire, HAND! e STRUT FITTINGS etc. These are actually plan/printwood • SHOCK CORD packs and include the following designs: • COCKPIT TRIM Gulfhawk biplane, Fleet Trainer, Curtiss • PULLEYS CJP Swift Pursuit, Spad, V-100 Vought Cor­ VkSE • INSTRUMENT HOUSINGS sair bipe, and the Fokker DVII biplane. For additioiul information, brochure and catalogue $end O.btk These are priced from $1.25 to $1.79. PROCTOR ENTERPRISES INC. Available through your dealer. P.O. BOX 9641 Write to Vintage Aero (1 The Glen, SAN DIEGO. CA. 92109 Tenafly, New Jersey) for their 24 page Write lor a free catalog. Dept. 21 R DEALER INQUIRIES INVITED MFQOt AT 6821 CONVOY CT. SAN DICOO CA. catalog o f unbelievable goodies. The cost 10107 Adella Ave., South Gate, CA 90280 is one dollar. · while riding a “bike” if you want to serves a double purpose of creating a Choppers...... Continued from page 21 turn to the left, you must actually move force which balances gyroscopic reac­ the earth, may be explained by applica­ the handle-bars to the right? Try it if tion during the turn and also recenters tion o f the same fundamental laws of you don’t believe me . . . it ’s true. To the entire assembly to its neutral posi­ motion, for the earth is similar to a make it go left, the spinning wheels tion as soon as straight flight is achieved. huge gyroscope rotor spinning freely in (gyros) must be “ precessed” to the right The size or mass of the gyro rotor, as space about an axis through its poles. ... think about that! well as its rotational speed, determines By reason of the earth’s rapid rotation, By refering to the drawing, we can the amount o f precession for a given its axis points approximately in a con­ see just what the reaction o f a spinning turn rate. The greater the mass or the stant direction in space the same as the gyro will be to an applied force. The higher the speed will make the precession axis o f a spinning gyroscope rotor main­ axis of rotor rotation will be called “ Y ,” much stronger. Weakening the central­ tains its direction in space. This parti­ the axis o f the gimbal frame "X ,” and izing springs will also have the same cular fundamental of a gyroscope is the vertical (or turning) axis "Z .” The effect, however, certainly isn’t recom­ called "rigidity in space,” which simply gyro rotates at high speed as indicated mended. In fact, about the only thing means that a spinning rotor (or wheel) by the arrow “ a.” When the helicopter you can do is boost your voltage to the will tend to maintain its same plane of is turning, for example, to the left, the motor to make it run faster. Do not rotation unless acted upon by an out­ entire gyro assembly is rotated as indi­ exceed the 6 volt rating, unless you are side force. Whenever such an outside cated by arrow “ b ." This rotation applies certain you have the very latest motor force is applied to the gyro, it "preces- a “ force” to the rim o f the gyros and which can be boosted a couple o f volts ses” (in a peculiar fashion) to a new the "reaction” is 90 degrees in the direc­ without burning up. position. Precession is the second funda­ tion of rotation of the gyro as indicated. Electrically, you need to provide a mental principle o f a gyroscope. Every­ As a result, when the helicopter turns separate 4.8 volt, 500 mA power pack day applications o f these two principles left, the gimbal frame dips in the oppo­ to drive the electric motor. The motor can be observed by watching the toy site direction. This dip is limited to ap­ leads are red and black . . . black is nega­ gyros, the children’s spinning tops, and proximately 45 degrees and stretches tive and red is plus, however, if after the bicycle. Have you ever noticed that one o f the centralizing springs which installation, you get reversed motion in SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 71 ORDER TODAY O m ό 2 ® f? 3 T"O (ΛQJ r+ to CD «Λ to CD r-+ a 3 ) Q l 3 C CD «Λ Q. CD & 3 c < N VI *5’ CXI c _ (Λ O ro % w Ι ­ ο V» CD Λ z ® ϋ 3 o CD_k Ό CO r O >sj £ ex* toCD _10 CD Q> LOOKING FOR SOMETHING? CD o> 5: KJ | o Use the H75 radio control 00 | ! Ό = s “ w The 1975 Radio Control Buyers Guide con­ ? | CDλ Λ tains over 1300 listings. It has pictures, specs, < CD V ) descriptions, and prices for radio control boats, > §■ Λ K) Ο Ξ. cars, airplanes, helicopters, sailplanes, radios & W o a. ■Ο CD accessories. It is edited by Eric Meyers, former < * editor of the RC Products Directory. Contains ONLY $2.75 extensive indexes for easy reference. A must at your local hubby store. for every radio control modeler. the tail rotor movement, simply reverse As stated in the instructions, it is tho). When all else fails, reread the in­ the direction o f motor rotation by chang­ wise to experiment with the gyro a little structions, since they are pretty good. ing the battery connections around. By in order to get the feel o f its action. As far as mounting the cube in your the way, don’t try to guess the way the It won’t hurt anything if you carefully helicopter, it doesn’t make a bit of dif­ tail is going to react until you have remove the cover and observe the spin­ ference whicji direction it points, nor completed the installation and have com­ ning gyro in your hand as you turn it where it sits. Just be sure that the base pared the gyro’s action to the proper and watch the gimbal frame dip. A t this is parallel to the floor, otherwise it will turning action on the chopper. Remem­ time, you can observe the action o f sense motion about another axis, and ber, the gyro opposes the direction o f the wiper disc on the main pot. This correct for these motions by signaling yaw and should send a corrective signal wiper disc will later be adjusted in ac­ the tail rotor (and you certainly don’t in the opposite direction. It is also pos­ cordance with the directions to make need that). sible (with reversed motor wires) for the servo stay centered whether or not The KAVAN gyro will detect only the gyro to send an assisting signal the gyro is plugged into the circuit. If, turning motion about its vertical axis. which will cause the helicopter to ro­ at some future time, your gyro refuses It will not respond to pitch up or down, tate violently. to send a signal to the servo, it will nor to banking left and right, provided probably be because the wiper arms are it is mounted “ fla t.” It will not respond not contacting the conducting ring to ascent and descent modes o f opera­ which lies directly beneath the disc and tion either. The turning motion about may have to be readjusted slightly to the vertical axis causes precession ac­ do so. The gyro pots are connected in cording to the rate o f turn and not in such a way that the main pot centers accord to the amount of turn. Therefore the servo motor in harmony with the it can be mounted almost anywhere in gyro and the smaller pot provides a the machine and it will do the proper sensitivity adjustment. Turning this smal­ job. For a given rate o f turn (say 20 ler pot clockwise increases sensitivity degrees per second) the gyro will lean a and produces very large servo move­ given amount regardless o f its location in ments from either gyro or transmitter respect to the main rotor shaft. The inputs. Counter-clockwise adjustment re­ natural conclusion is that if it is mounted duces the servo sensitivity and movement in either the nose or tail, it would have o f controls. You’ll just have to experi­ a greater movement and hence a greater ment to find which is the best for you reaction than if it were mounted near . . . I prefer a fairly large input which the center of the helicopter. Not true . . . makes the helicopter very directionally it measures rate, not distance travelled, The Kavan Gyro with the lid removed. Hand stable with lots o f potential transmitter remember? What if the cube is mounted gives idea o f its small size. input, (be careful you don’t overdo it with the arrow pointed sideways, won’t

72 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER Pearls Take U.S.F.F. Team Championship! Pearl Team #2 won the prestigious team honors at the U.S. Freeflight Championships at Taft, California, over the Memorial Day Weekend. In addition, Guy Kirkwood set a new Class A record of 43:31, using his FAI Midi-Pearl to make four flyoff flights after he damaged his own “A” ship. Pearl team members were Gene Simpson, Ed Cad- well, and Bill Moore. Flying Pearls in V2 A, A, B, C, and D, they outscored the toughest competition in the country. Want to win? Fly a Pearl—in any size—and be set for top performance. American Balsa Corporation V 5250 Gulfton, Bldg. 3-D, Houston, Texas 77036 it give a false reading? Wrong again, it gyro "locked” it in this new attitude, experienced the same problem. Sudden­ still senses rate of turn regardless of you might find yourself working harder ly, it dawned on me that the plastic which direction it is pointing! to correct back to level than if you had belt that drives the tail rotor was slip­ Now that you’re really confused, I let the natural stability o f the helicopter ping and when I applied too much con­ guess this would be a good time to tell do it for you. Well, it would be an in­ trol, the drag o f the tail rotor caused you that it could be mounted on its teresting experiment, and I’m sure some­ the belt to be absolutely ineffective and side, in which case it could be used to one will try it one o f these days. Just torque took over in the opposite direc­ detect pitch up and down motions and make sure you let me know how it tion. As I mentioned earlier, I reread thereby send corrective signals to the works out, cause I’ve been thinking along the instruction booklet which pointed pitch (elevator) servo. Or, it might be these lines myself. Ha! Before we leave mounted on its side in a cross-wise di­ the gyro and get engrossed in another rection, then it could be used to detect subject, consider the possibilities of in­ lateral roll and correct the roll (aileron) installing the unit in race cars for better servo. Perhaps you want a full-house tracking? Or model speed-boats? Even autopilot; all you have to do is buy 3 R/C airplanes and gliders might take gyros and locate them as described above advantage o f the gyro’s unique capabi­ and connect them to the appropriate lities. servos and away you go!!! Before you HELI-BABY FLIGHT TESTS go to all this bother, however, let me Last month we reported on the caution you that it wouldn’t be practical SCHLUTER Heli-Baby and what a fine for the simple reason that none of the machine it was to assemble and fly. gyros would return the helicopter to a Well, we haven’t changed our mind, level position in respect to the ground, however, did discover a certain basic and that’s where it ’s at! problem area that had to be resolved Although the gyro does correct for before I could call it an unqualified an unwanted motion and attempts to success. After a few very fine flights, I bring the motion to a stop, it does not noticed that I was losing directional con­ return it to its former position. In the trol in certain maneuvers. Not being too case o f the directional yaw, it will stop bright, I continued flying it until I even­ the turn even though you might be on tually lost all control and wiped out a a different heading. This doesn’t make set of rotor blades. Actually, I expe­ for violent headaches ’cause you simply rienced a complete control reversal on turn it back to where you want to go, the tail rotor. or leave it where it stops. I’m afraid, After installing new blades (and still Top view showing Tucker's mechanical modif­ however, that if it pitched up and the not being too bright) I flew again and ication of the Schluter "Heli-Baby."

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 73 /ÉhallengenU, second t o none (

-AND THE “ ONLY” STARTER IN THE U.S.A. DESIGNED TOTALLY AS A MODEL ENGINE STARTER. IT'S NOT TAKEN FROM ANY OTHER PRODUCT, LIKE OTHERS ARE...... -STARTER GOOD ENOUGH TO BE REQUESTED BY THE U.S.A. INTERNATIONAL TEAM FOR THERE OWN OFFICIAL USE. TO DATE IT HAS BEEN TO R/C, SCALE, FREE FLIGHT AND OTHER EVENTS, PLUS NOW BEING USED BY THE A.M.A. SHOW TEAM .... -STARTER "GOOD” ENOUGH TO CARRY A FULL 5 YEAR WRITTEN GUARANTEE ON PARTS AND PERFORMANCE . Do you really want anything less than the tjQ N /Ď lŘĎ Ň ICS= INC. 2 South SYLVANIA AVE. PH I LA..PENNA. 191 II Th· World« Largest Hanufacturar of Hod·! Engine Electric S tirfn .

into the tail boom and clamped it in FIBREGLASS EPOXY PROPS THE LARGEST place with a small automotive hose All types of racing props Sport Goodyear Rat clamp. The KALT unit fits perfectly FAI&BTeam Racing Free Flight QuarterMidget PLANS COLLECTION! without any other modifications neces­ 7x35 $350 sary to the tail end . . . even the rear 7x6 Thin Hub skid adapts the same way as originally O. T. F/F LIST...... 75i 7x6 Thick Hub 3.50 mounted. 7x6 Thin Hub QM RUBBER/TOW LIN E ------75 i The front end was not quite as simple, 450 7x6 ThickHub QM O. T. FLYING SCALE - - - 75* since a pair o f bevel gears had to be set 7x74 Russian Type 350 into place. I started this project by re­ 7x76 Russian Type moving the clutch-housing shaft and re­ 7x9 Speed 3.75 JOHN POND moving the pulley from its end. I next 7x95 Speed turned down the end a slight amount in 8x8 4.50 Old Time Plan Service 8x8.5 my lathe to make it accept a KAVAN Qu finished All ethers as moulded Mtnaed P.O.Box 3113 bevel gear. This installed, I then pur­ W« mail preps te special order Ante lor quote SASC San Jose, Calif. 95156 chased a KAVAN bevel gear transmission lllraoisResidens add 5% Sales Tai Kelly Products Inc PO Box 38 Phone (408) 292-3382 (part #3105) and proceeded to mill o ff Western Springs.Illinois 60558______the base portion and the sides until it was a snug fit between the fuselage sides. out (carefully disguised) that the belt good though, ’cause it started slipping This was bolted in place (same way as could be shortened by cutting out a on the very next flight. other parts in fuselage sides) so that the section and heat-welding it back toge­ There was only one answer left and two bevel gears mated at 90 degrees. By ther. I tried that with very little success that was to gear-drive the tail rotor. This turning a small adapter for the tail rotor in either the welding process or the net was accomplished without too much drive, I was able to use a standard KA­ results. By carefully setting up a jig fuss, however, I had most of the parts VAN drive shaft (cut shorter) to connect with holes drilled to hold the belt ends on hand when I began the conversion. the two together. And that did it! I later in alignment, I managed to get the weld I first sawed off the existing tail drive added a conventional starter belt for to hold, provided I permitted it to cure unit (pulley, shaft, etc.) and then easily ease of starting . . . that pulling on a rope for a couple o f hours. Didn’t do much inserted a KALT tail rotor assembly gets to be old stuff after awhile, especial­ ly after you whip your arms ’till they MODEL R/C HELICOPTER DATA CARD are black and blue! Ha! and, of course, Complete and return to: MODEL BUILDER/CHOPPER CHATTER I installed a KAVAN gyro on the landing 1105 Spurgeon Street, Box 4336, gear by shock mounting a plywood plate Santa Ana, California 92702 across the struts. No further problems, and it really has become a sweetheart Name: ______Phone:______in my growing stable of birds! Postscript: The latest word is that Address :______Age: ___ the factory is now considering a pair o f R/C Helicopters: Interest only □ Building □ Completed □ slightly larger pulleys and a different type of “ flat” belt for much better trac­ Type model or kit:______tion. If this simple modification works, it certainly would be preferable to the Areas where help is needed:______more expensive gear-drive as described above. Watch for further developments. List special skills you might share:______TAPERED ROTOR BLADE Remarks:______— EXPERIMENT While we’re looking back for a bit, le t’s look at the “ L A R K " R/C helicop-

74 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER (iilllv n tv Ή !"' I p r o d u c t s , INC. 535 Davisville Rd., W illow Grove, Pa. 19090 · (215) 659-3900 PDQ MOLDED WING CORES... 10 times the strength of cut foam wings Score another “ first” for Sullivan — the first molded wing core in the world. In addition to its incredible strength, it’s quicker to complete construction, lighter because you use less balsa, and far more economical. • fits 8 out of 10 pattern aircraft • designed for 40 to 60 powered aircraft • fully elliptical • can use modern iron-on coverings Hurry over to your dealer’s and take a look — PDQ.

o n l y $ 8 ^ I P D Q i n — ter, the very popular British entry. I read last month about experiments which were being conducted with tapered rotor HBR-2 Double Rudder blades fo r the LARK, which suggest Outdrive Assembly that this shape of blade might have ad­ $34.95 vantages over the constant chord design. dealer This whetted my interest, particularly inquires when I was about ready to do a new set invited for the Heli-Baby anyway! The results were exciting enough for me to make another set for the LARK and see what they would do on that chopper. Well, I have to agree with David Bod- V i dington that, from my observations, I 'iJSPEC/ALTlLS believe they do have good (or better) // characteristics, however, will leave it up PO Box 588 Saratoga Ca 95070 to the scientists and aerodynamists to explain the merits and the whys. Our CUSTOM MODEL BOATING HARDWARE tests indicated that the engines did not have to work as hard to develop the plished in a conventional manner. As we cover a complete rundown of the modi­ same amount of lift as with the more get the time to build more blades, we fications and changes to the KAVAN conventional blades, probably because may find all sorts o f weird shapes that je t Ranger, since its beginning up to the mass and drag is moved closer to will outperform the regular blades. Char­ the present time. If flight testing is com­ the center o f the rotor disc. lie Gilbert, at last report, was working pleted in time, we’ll also have a report Perhaps I should clarify that a bit on sume super flexible, helical shaped on the latest factory modifications for more . . . the engines appeared to accel­ blades made out o f some new space-age the Micro-Mold Lark, including the new erate faster and smoother and produced material . . . maybe that’s the answer. teetering rotor head conversion. a higher blade RPM, which would ac­ One thing for sure, I’ve run out of POSTSCRIPT: The following note comes count for the increased lift capability. time for this month. Next month we’ll from Dieter Schluter, manufacturer of Control response on both choppers increased considerably, with the net re­ NATIONAL SOCIETY OF RADIO CONTROL AEROBATICS sult that overall maneuverability was only a little short of fantastic. We have NEW MEMBERSHIP AND RENEWAL FORM Please PRINT no conclusions as to firm dimensions and taper ratios, however, will pass on to you the details o f the blades we used Name ______A M A No. ______on our respective choppers. Leading edges were shaped out of ramin wood Address ______or ash, with the ramin being the best in my opinion since it’s easier to shape and C ity ______State ______Zip ______very light. Medium to hard balsa trailing edge stock was cemented to the leading Competition Classification: α Π β Π C/DN □ C/DE □ edge and the whole blade sanded to a NEW Π RENEW AL □ NSRCA N o______conventional airfoil shape. We made no attempt to thin down the leading edge Dues are $4.00 fo r one year. section at the tips, and held a constant Send check or Money Order to: thickness throughout the blade length. NSRCA, c/o Sally Brown, 8534 Huddleston Drive, Cincinnati, Ohio 45236 Covering and balancing was accom­

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 75 DAV I ES-CHARLTON .15 RAPIER 0 I ts cl 129.95 PP. R/C *35.45 PP.

. . . this beautiful Monocoupe by Megow? JUW£RS JU 5? uft**—* naøw u o m© ra** λ w t ic One of the four most super-detailed R3UFNER O f- 5 * o o x m m s u n t o mo n u u h v i a ·, t< «ο plans that Megow ever made. Rueeen stooge flaws HOBBY HIDEAiAYjDtLAVAN,ILL Q ia n — xurn *u m u m « μ w * w n mcora We have this, plus many others, print­ O m im i (AMC M U MO « U *tv (309)244-7389 61734 O o a «3 m—rt urt v * im m to m v i ed in clean black line. For catalog, send O K u in u t K mo um u m 11 oo .SO0, refundable with first order. GOLDEN AGE REPRODUCTIONS d.tc. cJc/iqn P. O . B o x 13, B ra in tre e , Mass. 0 2 1 8 4 QIPAO ΜΠ Ο «Μ the “ Heli-Baby: ” “ The belt prestress can be regulated which featured a reprint o f some early “Dear Modeler, by sliding the tail boom so that, when Air Service flying regulations, from “During production of the belt for placing the belt over the front pulley, which we have abstracted the following: the tail rotor drive of the helicopter it is necessary to stretch it tautly a fur­ “ Don't take the machine into the air ‘Heli-Baby,’ it was found that in the ther 6-8 mm. Make sure that the gauze unless you are satisfied it will fly .” initial production series, a great differ­ size runs on the outside. The belt pre­ “ Never leave the ground with the mo­ ence in belt quality existed which di­ stress should be checked once in a while, tor leaking.” versely affected prestress and transmis­ just before flying and when necessary, “ Pilots should carry hankies in a han­ sion. readjusted. dy position to wipe o ff goggles.” “Duly, as a technical improvement, “For the first series o f “Heli-Baby" “ Riding on the steps, wings or tail of the belt has been replaced by another equipped with the old type o f belt, the a machine is prohibited.” with a gauze insertion and the pulleys resulting technical improvements w ill be “ Do not trust altitude instruments.” have also been altered accordingly. Two regarded as customer service and free o f “ If you see another machine near pulleys o f the same size w ill now have to charge. AH following series have already you, get out o f its way.” be mounted. been equipped with the improved drive “ No two cadets should ever ride to­ “ Each tail rotor blade is to be short­ belt." gether in the same machine.” ened by W mm, as against the length And for those who have already pur­ “ No spins on back or tail slides will shown in the building plan, so that the chased a '‘Heli-Baby" kit with the old be indulged in as they unnecessarily total diameter of the tail rotor is re­ type belt, you can get the complete strain the machine.” duced by 20 mm. ‘flat-belt’ conversion kit directly from “ If flying against the wind, and you the US supplier, MRC (see ad on back wish to turn and fly with the wind, cover). West Coast modelers can get don’t make a sharp turn near the ground. theirs from J&J Distributors, 26071 Via You might crash.” Viento, Mission Viejo, CA. 92675, phone “ Don’t attempt to force machine on­ (714) 837-2676. · to ground with more than flying speed. The result is bouncing and richocheting.” Hannan...... Continued from page 42 “ Pilots will not wear spurs while fly ­ ing disadvantage in our favor, however, ing.” one might think in terms o f using this “ You must not take o ff or land closer principle to deliberately enlarge 3-views than 50 feet to the hangar.” to Peanut Scale size! “ If emergency occurs while flying, UNITED STATES AIR SERVICE, land as soon as you can.” 1920 STYLE SOOPER REVIEW FudoTakagi brought an issue of “ The All scale modelers should appreciate Medallion” into the Hangar recently, this product review, by Ray Smith of

76 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER the IPMS: ITCHI-GOOMAofSkidishima, Japan, has offered as their first rendition, a kit of plastic scale rivets! Scale rivets have long been the ultimate dream o f the master modeler, and now they are avail­ able! Each rivet, and there are 10,000 NEW in the kit, has been made with true fidel­ ity to detail. Each of these gems is indi­ alu*HúicoH, *«Ι' I vidually wrapped in a protective plastic bag. The kit comes complete with tube cement, and a set o f plastic tweezers. Sold under the trade name SOOPER - $ 4Ζλ ϊη (£ 4 4 RIVETS, they should be available in better hobby shops everywhere. Better I l l reserve yours now! When examined in detail, they were & V found to scale out closer to 1/70. How­ 50" SOLING-M tQR? ever, this is a minor imperfection which can easily be cured by three buffs (light­ (fag A -fctted : : : ly) with slightly moist 0400 size wet or dry emery paper. This will reduce them exactly to 1/72 scale if done carefully. Λ χ α * ® iK. At first, some difficulty was experienced ? & with the tube cement, but with prac­ * handuuvtc f tice, the experienced modeler can master the technique. Rumor has it that this same firm will shortly market a rivet gun which will ?TgAe**tÄ(ef, fan ifc I ' operate on hot compressed air, and that they are seriously thinking about enter­ ing the 1 /32 scale market. We can hardly wait! * THE HANGAR PILOT 210 EAST ORTEGA ST. More gems from the pen o f Dr. John SANTA BARBARA, CA 93101 Martin, editor of this most enlightening Florida newsletter: "News from the Flying Aces Club: ism with a minimum amount of work. This is the King Kong o f the fun clubs, The engine is made by first making the P E A P O D and I get the impression that at every DESIGNED BY crankcase of a 7/16 inch diameter hard­ Tom Protheroe fly-in the members belabor each other wood dowel 1/4 inch long. A 1/4 inch with inflated pig bladders, and electric hole in the crankcase provides for the cattle prods, to say nothing of seltzer nose plug and prop shaft access. The AMY A CLASS bottles and custard pies. Get the idea? cylinders are made of 1/4 inch long Any super-serious guy gets flung out, pieces of 8-32 black nylon bolts glued 7 0 9 3 6 / 6 0 0 I think. to the crankcase. Push rods are simu­ eo^ “ John has also taken a searching look lated by pieces of straight pins inserted at the problem faced by most clubs. . . into the crankcase. Details of the cylin­ that of the inactive (but usually highly der heads are omitted, since the plastic vocal) club members: "How about all cowl prevents direct viewing o f these you hangar pilots who haven’t supported parts. Upon completion o f the engine the club this year coming out with some­ the crankcase is glued to F t. The cowl thing, and flying it at this last contest?? was made by forming plastic over a hard­ Thanks!” wood mold using a Vac-u-form. The Dr. Martin goes so far as to publish a two cowl halves are cemented together, "Purple Onion” and “ Gold Garlic” award painted, and glued to C2. list of non-supporting members. He fol­ The landing gear is formed o f .020 lows these up with an honor-member music wire and wrapped with thread, as list, composed o f those who have “ Strug­ shown, to the wing structure. Balsa fair­ gled to earn a point or two and sent his ings are added after covering the wing. WRITE or CALL 213-661-7928 creation into the air during a contest.” This provides a good rugged landing gear FREE CATALOG $ 2 9 . 9 5 Food for thought. · with good torsional spring action. The KIT FEATURES wheels are formed in two identical halves • COMPLETE SAIL CONTROL MECHANISM Peanut...... Continued from page 43 from plastic, using the Vac-u-form. • MACHINED WOOD AND METAL PARTS • c o m p l e t e BASIC HARDWARE PACKAGE Being somewhat partial to radial en­ The remainder o f the construction • ALL RIGGING A A FULL SAIL PLAN gine scale models, the D.11 in my mind, is evident from the drawing. The only • A BASIC COURSE IN SAILING made an excellent choice for a peanut deviation from the drawing which is R!C SAILPLANES Λ ACCESSORIES subject. The construction is rather con­ helpful during the trimming process AVATAR j2 $32.95 CURIO $44.95 ventional so only details of unusual fea­ would be the addition of soft wire hin­ HI-STARTS - PARACHUTES- RUBBER tures w ill be enumerated. ges to the rudder and elevator. Close DEALERS Λ DISTRIBUTORS STD. TERM One o f the important aspects for real­ inspection o f the skeleton photo of a M*S LIMITED ism is the engine. The model shown is a Jodel built by one of my flying buddies ft. O. BOX 30748 result o f an attempt to achieve this real­ shows this modification. L.A. CA. 000 30 J SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 77 R/C Soaring .. .Continued from page 19 scale at the Nats with his Bowlus Baby PEAPOD POWER Albatross . . . and do you know what? He did! The Bowlus construction article You'll pass by the fleet when your boat Is powered by CARR SAILS. With more is featured elsewhere in this issue. Just competition wins in more A.M .Y.A. classes than any other sailmaker, we know what an le me say here that the Bowlus flew important part of success sails are!!!! Act now and this MODEL BUILDER Special will beautifully and won the static judging allow you to suit up your PEAPOD for only $20.00, a saving of 1/3 from regular prices. Write for our off-season savings in other classes and for a copy of the 1974 brochure and ... ju s t what it takes to win overall. price listing!!! The scale event was flown to the new A.M.A. provisional rules which called Specify color: white, gold, red, dark blue, light blue or green. for a 3-1/2 minute max. The new rules Specify main luff required: bolt-rope, dress hooks, double luff. are clearly slanted toward the more Give AM YA boat number and choose numeral color: black, white, red. scale “ museum piece” type ships. Probably the high point of the scale Make check or flying was Doc Hall’s first-day flight of money order hisSG-38 Schulgleiter. Doc built a much payable to: CARR SAILS larger version o f the ship he entered last 7607 GRESHAM ST., SPRINGFIELD, VA. 22151 year, and then had the misfortune of wiping it out in a practice flight one The prop was constructed in Easy B week before the S.O.A.R. Nats. Regard­ Sailing Yacht* For indoor fashion and has been found to be less o f his bad luck, Doc wanted to fly just as good as a carved prop and much in the scale competition, so he cleaned Radio Control quicker to build. up last year’s Schulgleiter (a post WW I The original model was covered with primary trainer) and entered it. In the yellow tissue and Lite-Coat dope, black first round of scale flying, Doc’s luck TAHOE 600 numerals, and a red fuselage stripe. Since changed . . . he launched into a boom­ the airplane was primarily a homebuilt ing thermal! Three and a half minutes with several hundred kits sold, I’m sure later he had his max, a grin spread from almost any color scheme could be found. ear to ear, and an official timer who was trying to convince him that he didn't get any points for flying more than three Sailing...... Continued from page27 AMYA 36/600 CLASS and a half minutes. Doc, who says the SG-38 usually glides only slightly better LENGTH 36 in heavy work, that o f trimming the sheets, BEAM 9 In is left up to the fully proportional sail than his toolbox, reluctantly forced the SAIL AREA 600 sq In control system produced by SAIL EN­ bird down out of the thermal... and spent the rest o f that day and most of $38.95 GINEERING. It plugs right into the receiver. Three channels does everything the next, grinning ... and grinning ... necessary to keep her sailing. This photo and grinning. also shows a top view o f the traveller. The University of Michigan Aero­ VALKYRIE The lanyard limits the amount o f travel nautical Engineering Department once AMYA SO/800 CLASS allowed to port and starboard. again presented its Felix Pawlawski Mem­ LENGTH 30 In Photo No. 11: WHAT A RIDE! This orial Scholarship award for aeronautical BEAM 11 '/j In SAIL AREA 800 ;q in $74.95 shot was taken at the Second Annual know-how and soaring competition ex­ Complete kits include molded plastic Marblehead Colonial Regatta in Pitman, cellence. During the three days of com­ hull and components, all rigging, finished N.J., April 27, 1975. Strong winds,good petition, the juniors (under eighteen) sails and semi-fipished wooden parts. skippers competing, and a fourth place are given a written test o f their know­ finish for YANKEE DOODLE. ledge o f aerodynamics and related mate­ TAHOE SAIL SYSTEM $27.95 Now that you’re all excited about rial. The test is given under an honor building an R/C yacht, the first step is system that the junior w ill not accept VALKYRIE SAIL SYSTEM $35.95 to join the American Model Yachting any outside help in answering the ques­ Association. Send $5.00 to Mr. Bud tions (and having seen the questions, I m r o f i ' X Salika, 3917 Sunnyside Ave., Brookfield, seriously doubt that anyone other than 11715 Adenmoor Ave. Downey, Co. 90241 Illinois 60513. The $5.00 will be some an aeronautical engineer would be o f help anyway!). Based on the answers to C lif residents add 6 * tan DEALERS WELCOME o f the best spent money to start in R/C YACHTING! the quiz, plus performance in the con­ test, a $500 scholarship and a distinc­ tive trophy are awarded to the winner. This year, Peter Rambo o f Camarillo, SPIRIT OF 76 California (who was 2nd overall in OUR 5 0 / 8 0 0 YANKEES HAVE JU S T SWEPT THE 1 9 7 5 Standard class), was the deserving reci­ COLONIAL REGATTA PIACINC. 1 st, 3rd, Itth, 5th. pient o f the award. A LIGHTWEIGHT RACING MACHINE AT 13.5 POUNDS, Although I don’t want this column THE PLANING PERFORMANCE OF THIS BOAT IN THE HEAVY A IR COMPETITION WAS A SIGH T TO BEHOLD. to become a “soapbox” for my own THE VESSEL FEATURED IN ROD CARR’S THREE PART personal rose tossing, I would like to ARTICLE IN MODEL BUILDER PROVED TO BF. THE WINNER, FINISHING 2-2-2-1-1-2-1-1 FOR THE DAY relate something that happened to m y­ HULL self and my wife at this year’s S.O.A.R. Kiii _ $55.00 NATS that really conveys the spirit that VANK RUDDER * 7 is present at this meet. My wife, Gwen, WE ARE ALSO AUTHORIZED MANUFACTURERS FOR THE EAST COAST 12-METER ONE-DESIGN AND PRODUCE launched into a ’wing-ripper’ o f a ther­ THE POPULAR HUSON 3 ° , AN AMYA 3 6 / 6 0 0 CLASS. mal along with several other fliers. In a matter o f two or three minutes, her LEISURE PRODUCTS, 6920 BRADOOCK ROAD ANNANDALE, VA. 22003 Windfree was a speck in the sky, and was drifting downwind at an alarming

78 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER CARL GOLDBERG , The Best in Flying with... 'Φ

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L I'L W IZAR D-Shaped balsa COSMIC W IN D -4 3 " span for wmg. die-cut fuselage. 2 1 " soan .19 to 35 engine. GX7 $ 1 1 .9 5 for .049 engine. G5 $ 5 .9 5 1/2A B LA ZE R -D ie-cut balsa, tissue. 40" span, fo r .049 engine. G1 $ 6 .9 5

SHOESTRING R A C E R -1 8" span. A ll die-cut balsa Q2 $ 2 .9 5

BEAN—21" span Favorite 1/2A stunt model. For .049 Eng. 68 $ 5 .5 0 RANGER 30-D ie-cut balsa. 30" RANGER 21—All die-cut balsa span, for .010-.049 engine. G2 $ 5 .9 5 parts. 21" span beauty. 03 $ 2 .9 5

SAFTI-FLITE 1/2A HANDLE LITTLE TOOT-Sporty Biplane, lor SWORDSMAN 18—Die-cut balsa 18" 049 engine, all die-cut balsa. span, lo r .020 049 engine. G3 S 5 .5 0 Best handle made. G4 $ 5 .9 5 RANGER 28—My "pre-lab plus paper" Including lines, 28" span, 2 colors D5 $ 2 .9 5 only 79c. HI

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LONG BOOMS! SPIRIT OF ST. LOUIS and NYLON HORN! A miniature duplicate. I VOODOO-36" combat-stunt JUNIOR S A T A N -2 9 " span, 21" wingspan. Dl $2.9öl Carl Goldberg Models Inc. lo r 19 .35 engine. Single kit G13 $ 6 .9 5 combat- stunt, lor .15 to .19 4736 W. Chicago Ave., Chicago, IL 60651 Double k it 0G13 $ 1 2 .9 5 engines. G20 $ 5 ,9 5 I am sending 25c for 8 pg illustrated Catalog with Basic Explanation of R/C Equipment and Radio Control Definitions ALL ITEMS AVAILABLE IN CANADA N a m e ______Fo r best service, see your dealer fo r item s you want. It not available, w rite direct; add SOdper item (S i outside U .S.I. Minimum order $1. Address . CARL GOLDBERG MODELS INC. C ity ____ 4736 WEST CHICAGO AVE.· CHICAGO, ILLINOIS 60651 State.Zip -

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 79 EKIogictrol HIGHEST VALUE AT A VERY LOW COST IS WHY R/C MODELERS BUY EK LOGICTROL For our full line brochure, write EK-logictrol, Dept. SMB.3322 Stovall St., Irving, Tex. 75061. Distributors, jobbers and dealers contact us for our new plan. Reliable radio control systems

ple offered Gwen their back-up airplanes Prior to the general membership meeting, to fly. 2) Kelly Pike, from the Hobie the Board o f Directors voted on several Model Co., came up with a spare Hobie written proposals. One o f the more sig­ COVERUP! Hawk for her to use to finish the con­ nificant actions taken by the board was Sturdy, dark green vinyl covered test . . . 3) Bob Elliot, o f E.K. Products, approval o f a team selection method binders for your valued copies of loaned her a radio . . . on her frequency for international competition. The selec­ MODEL BUILDER. Gold logo. . . . out o f his back-up airplane . . . 4) tion process, designed by Otto Heith­ Steve Work, one o f the first Level V ecker, will start in the Spring o f 1976 LSF fliers, started looking for the lost with quarter-final contests to be held Windfree on foot. 5) With Greg Temple’s by individual clubs. These quarter-finals help, and Jim Simpson’s tools, we man­ will be sanctioned by the N.S.S., and will aged to put together a flyable airplane be flown to the F.A.I. rules in effect for Gwen. The next day Steve Work at that time. An individual may com­ (who was still out looking for lost air­ pete in two o f the quarter-final contests. planes during the competition even A formula was developed to determine though he was strongly in contention) the number of fliers from each quarter­ found Lila Stamm’s lost Windrifter. That final to move on to the semi-final. The afternoon, Jason Josaitis (son o f AMA semi-finals will be held in six different District V II V.P. Jack Josaitis) took me locations, each to be chosen by the con­ up in the family Cessna 180. We flew for test directors to be nominated by the more than forty-five minutes, but with­ membership. Six finalists from each of out any luck, in locating the AWOL the semi-finals, plus the three members Windfree. Finally, Wednesday morning, o f the last American F.A.I. team, will Only $4.95 each, two for $8.95, or the missing airplane returned. The wor­ compete in the finals to select the three three for $12.95, postpaid in the US. kers at the oil refinery had seen the new team members. Tentatively, the Canada and Mexico add 30 cents per glider circling the flame on top of the finals will be held in Albuquerque, New binder. Overseas add 50 cents each. cracking tower. They had thought that Mexico. Albuquerque was chosen be­ someone was trying to work the lift o ff cause o f its 5200 feet altitude, closely California residents add 6% sales tax. the flame! Apparently the Windfree lan­ approximating that o f Johannesburg, NOTE: One binder w ill hold 1971 and ded nearby . . . somewhat water soaked, 1972 issues. One each fo r 1973 and 1974. South Africa, the proposed 1976 World but basically intact. There were probably Championship site. MODELS' a dozen peopel involved in getting Gwen The other significant item to come back into the air, and this spirit o f help out o f the meeting agenda was the an­ BUILDER and cooperation was strong in every con­ nouncement by Dr. Larry Fogel, N.S.S. Box 4336, Santa Ana, Calif. 92702 testant almost w ithout exception. treasurer, o f the tentative approval by I watched Otto Heithecker launch the National Science Foundation to al­ rate. To make a long story short, she for a ten minute duration flight, and locate funds for a Low Speed Flight lost her plane downwind. We managed hit sink for most of a three minute flight. Seminar. This seminar will be held Janu­ to keep sight o f the plane until it dis­ An hour later Otto was coaching three ary 2, 3, 4 1976, at San Diego State appeared from view behind a building. or four other fliers, talking them into the University. Complete transcripts o f the (We found out later that two other lift zones, knowing full well that each talks will be printed and will be available planes had been lost in the same ther­ was moving ahead o f him on the score- from the N.S.S. The talks will relate to mal!) Gwen was heartbroken! We drove board. I know o f few contests where the results of low speed wind tunnel to the area where the plane had to have the spirit o f cooperation is so strong. research done under the National Science gone down . . . and discovered that the Wednesday night saw the traditional Foundation grant. This is the first such area looked like the back side of the awards banquet, with John Nielsen, the research to be done in this country, moon! There were rivers (complete with smiling Dane, acting as master o f cere­ and could prove to be most useful in barges), cement plants, oil refineries, monies. After presenting the competi­ advancing the state o f the art o f model rock quarries, swamps, trees . . . and no tion trophies, John saw to the awarding aerodynamics. roads. It took us about fifteen minutes of more than 70 door prizes ranging Other actions taken include a one to determine that there was little if any from radios, glider kits, and balsa wood, year moratorium on rules changes. It was hope o f finding her plane. But the loss to accessory packages, tools, and tool felt that it would be in the best interests o f her plane let me see just how great boxes. o f the N.S.S. to operate under the ex­ are the people we fly with! The N.S.S. meeting on Thursday, al­ isting rules. This, it was felt, will give That n ig h t. . . 1) Three different peo­ though poorly attended, was interesting. the organization time to mature, and will

80 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER NEW. .TEMPERATURE COMPENSATED NYROD A ROD FOR ALL SEASONS

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

NEW! 8" METAL ROD SU-PR-KLEVIS allow time for more careful evaluation F /F ...... Continued from page 50 o f what changes need to be made in the angle into 4 sections. Structural mem­ existing rules. bers should be divided equally among One interesting proposal was made the four segments. Figure No. 1, the by Dan Pruss, to create a ‘stand-way-off upper segments contain no spanwise scale event. This would create a special structural members. Therefore the tissue set of awards for a semi-scale sailplane will warp the wing upward. Figures No. flown against the normal competition 2 and No. 3 have structure somewhat aircraft. Static judging would be purely equally divided among the segments. a ‘yes-no’ type situation, where the mod­ These surface designs should resist tissue el would be compared to three-views or shrinkage stresses well. photos o f the full size craft and then A side benefit of this kind of spar judged as to whether or not the model locating is that not only is warpage re­ was a reasonable representation o f the duced but overall wing (or stab) strength T h e * 5 9 ·9 5 full size aircraft. This type o f event could is increased. If you have built some o f be run by a club without the usual the Spacer or early Starduster series with ^(V»NSTOIMf£fl complaints that scale judging was too the single or double bottom spars, you time consuming, or that adequate judges are aware that under load these wings DAZZLE THE CROWDS WITH A BRILLIANT ARRAV OF DARING AERIAL MANEUVERS· were not available. would be apt to break at dihedral joints. N O W I Y O U can own a b e a utiful Vintage 1 9 30 Fle e t Biplane Other items discussed included ways The addition o f a couple o f spars along to eliminate ‘sandbagging’ . . . the deli­ the top surface will eliminate this pro­ Th u stand o f f scale m odel was designed fo r the novice, yet meets the critical demands o f the expert. A ll halse, spruce berate attempts to delay launching by a blem, as was the case in the Starduster X and ply construction, with precision cut parts for exact nr. Precut. one piece p ly sid e s, preform ed landing gear and contestant, to allow time for conditions series when the 3 top turbulator spars cabane s tru ts , complete hardware package, and b o lto n wings. to improve. No action was taken, al­ were added, or with the Starduster 350 FA ST and EASY to build. though the board heard several sugges­ series and the multi-spar arrangement. A beauty to fly and it performs all the tions on ways to eliminate this problem. SPANWISE STRENGTH N SPA aerobatic sequences

So in closing, let me say that the DISTRIBUTION Wing span . . . 49" Engine .... S.O.A.R. Nats represented four days o f Directly related to balanced wing con­ Wing area . . 7 6 0 sq. in . O.A. Length . 4 2 " Flying weight . . . 4 3/4 to 5-1/2 lbs. hectic competition, information, head­ struction is the issue o f spanwise strength You saw it featured in the May 1975 MODEL BU ILD ER aches, and just plain fun. Special thanks distribution (see sketch). Any model . now see it at y o u r dealer o r ord e r d irect. to the Silent Order of Aeromodeling by wing under load has stresses which are Send check or money order, plus S I.55 for shipping Radio, and to Dan Pruss . . . one heck of acute near the wing root, but not so Wisconsin residents add 4% sales tax. Dealer inquiries invited a good contest director. much so at the tip. Consequently, the Phone: (608)-271-0355 Now if I just hadn’t blown that last need to have spars and other structural c ONCEPT MODELS ______round ... · members the same thickness and strength 2906 GRANDVIEW BLVD.. MADISON. WISCONSIN 53713

DATE REC'D. SOCIETY OF ANTIQUE MODELERS MEMBERSHIP APPLICATION NO. I hereby make application for individual membership in the Society of Antique Modelers. DO NOT WRITE IN THIS SPACE

NAME ______BIRTH DATE ______YEARS MODELING

ADDRESS CITY STATE ZIP

Please check if you belong to any of the following: Note: Membership includes 15% discount on one year MODEL BUILDER Magazine subscription. Give S. A. M. No. when subscribing. A. M. A. ______NO. . Enclose Membership Dues o f $3.00 and send to: Society of Antique Modelers M. E .C . A. NO.. 1947 Superior Avenue Whiting, Indiana 46394 S. A. M. CHAPTER NO. . In making this application for membership to the Society of Antique Modelers, I agree to abide by the rules set by the Society and realize that the goals of S. A. M. and the Old Timers movement are to encourage participation above competition and is dedicated to the preservation and reproduction of vintage model aircraft. ------S ig n e d ______SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 81 the root, and balsa in the tips, as well as using lighter and thinner (1/16 sheet vs. 1/8 sheet stock) balsa sheet for wing rib stock when cutting tip ribs. Planform design provides a similar benefit. A tapered or elliptical type plan- form includes less material and thereby decreases the amount of weight. Now, let’s take a look at the Three- View of the Month, Ekhtenkov’s A/2. He goes to great lengths to produce a wing that is tapered in strength, weight, and rigidity. Instead o f constant thick­ ness trailing edge, spars and leading ed­ ges, and constant weight ribs on a con­ stant chord wing, the EVG 1172 wing is rigid to prevent flutter when catapault launched. And even with all o f those pieces o f wood in it, the entire total weight o f both wings is 120 grams (4.3 H R E CHASSIS K I T ...... $144.95 ounces). Not only that, those tips must The Hallum Racing Enterprises chassis k it is now available and weigh less than 3/4 ounce covered each, includes: Chassis plate, engine mount, front end assembly, rear and that will certainly offer a reduction blocks and bearings, Kydex for bumper/radio m ounts/roll bar, in moment o f inertia over the more pro­ battery and receiver hangers, steering override, throttle over­ saic constant chord wings of the typical ride, flywheel and dutch assembly 112 teeth), integral gear and U.S. machine. brake (56 teeth), brake band and liners, front and rear wheels The more one looks at the EVG 1172 and tires, 1/4 inch diameter rear axle, body mounts, wing tubes wing, the more one becomes convinced and mounts, and aerodynamic wing assembly. A ll related hard­ that here is something very close to the ware (aircraft quality) included. Front and rear ends fully ad­ ideal. Tips are not below 90 mm chord, justable. AH parts available separately. BODY NOT INCLUDED. and are therefore still effective at A/2 U R F Engine m ount available separately ($9.95). Fits Veco, McCoy, glide speeds, and the length and taper n n L · and Taipan engines. o f the tips gives a reasonably large wing n n c Winner o f Expert Road Race, 1975 Winter Nationals, San (84 inches) while still retaining a good n n C Jose, California. root chord, and above all, a low moment o f inertia. HRE Inc., P.O. Box 4658, Irvine, California 92664 There is no doubt that a wing like this would be prone to damage from at the root as at the tip is not desireable. to show you that this is where they will tip-first landings, and tumbles in rough All o f us, probably in our earlier mod­ break. weather. There really is no model or eling days, suffered the ignomy o f hav­ Additionally, a wing (or stab) need type o f construction that can eliminate ing a wing break just at the end o f the only be strong enough to keep from the possibility o f damage from this plywood gussets near the root. This situ­ warping and to keep from breaking in source, but you will observe that Ekh- ation can be remedied by constructing normal use. Most of our current struc­ tenkov has used very large and presum­ the wing so that as the span progresses tures are over strong . . . usually in the ably soft butt-joint ribs at the dihedral to the tip, the spars and other structural wrong places. The added side-benefits o f break. These will presumably shear in members decrease in size and strength making tips less strong is that they also such a crash and could be very easily . . . essentially tapering everything so that become less heavy, which has a payoff epoxied in place for the next round. at the tip there is nearly a zero strength in providing better flight characteristics. With a 4.3 ounce wing and 1 /3 ounce factor. Any abrupt changes in spar cross Looking at the sketch will demonstrate tail on a built-up fuselage, there must be section must be eliminated. Plywood the ideas behind this theory. about 7 or 8 ounces of ballast around doublers should end at different places Other methodology not apparent in the nose o f EVG-1172. If this is the case, along the span, so as not to induce stress the sketch is to use heavier wood, i.e.: then it is no wonder the Russian models points, which are waiting for the chance spruce or pine, etc., as spar stock near look so light. Anyone who has added RACE the TDs and Wl N! SESEKL. Jerobee "Greenwood Vette" W/PROPORTIONAL THROTTLE, DYNAMIC BRAKING, LEXAN CHASSIS, REAR TIRES AND WHEELS "GLUED AND TRUED." With Futaba FP-2F RadioSystem...... $219.95 With Standard Jerobee Radio System...... $179.95 Charging cord fits cigarette lighter — recharges in 20 minutes. LEISURE ELECTRONICS 11 Deerspring, Irvine, California 92705 DEALER INQUIRIES INVITED.

82 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER NEWLY MANUFACTURED 1/4 X 32 SPARK PLUGS W .W .I MODEL ACCESSORIES Now you can once again run your old ignition engines and LE RHONE ROTARY ALSO AVAILABLE; join the Old Timer movement. ENGINE KITS SEPARATE CYLINDERS $2.50 each, plus 504 postage.

Ignition coils, $6.00 plus 504 postage.

Spark plug (not a "reject") tie tack or lapel pin. A neat way to carry a "spare"! $5.00 plus 50 cents List, 25 4 postage and handling. REMCO MFG. CO. P.O. Box 22414, Denver, Colo. 80222 ballast to the center of a model will at­ test to the improvement in glide stability. AVAILABLE IN 1 V i” Now, let me put some o f the above AND 2" SCALES into perspective as it applies to A/2 gliders. Take another look at the A/2 2" SCALE MACHINE GUN KITS three-view. It has the following features: ALSO AVAILABLE! PARABELLUM VICKERS 1. Conservative proportions . . . LEWIS strength and weight in the right place. SPANDAU AM M O BELTS 2. Wing section. . . Benedek B-6356b. This section was featured in this column last month, and is one used by nearly all successful European competitors. 3. Built up fuselage with a “ keel” area near the nose. This type of con­ SEND 25c FOR COMPLETE ILLUSTRATED CATALOG VINTAGE struction lends itself to more rigidity SCALE PILOTS and lightness than the typical (and flex­ WHEELS DEPT. MB . 181 PAWNEE STREET 1” , VA", 2" AND 3Λ" THROUGH ible) fiberglass boom o f U.S. models. 2s/e" SCALES 5" DIAMETER SAN MARCOS, CALIFORNIA 92069 4. Short tail moment arm ... to take advantage o f light thermal activities. 5. Circle Tow System. The pod is built up on a spruce four coats of thinned out white lacquer A closer look at the plans will reveal crutch. When the formers are in place over the doped silk. This gave a dead other features which are more subtle, but on the crutch, you can begin planking. white color to the open structure sec­ nonetheless provide even more food for The bottom 2 inches of the pod is tions o f the wings and tail surfaces, thought. planked with 1/8 spruce, to give some which is very realistic. The rudder was Three-view provided by Free Flight strength and prevent damage on landings. trimmed with red and blue Super Mono- News and commentary partially obtained The remainder o f the pod is planked kote. The stars were cut from an Ameri­ from Paul Lagan. with strips o f 1/8 by 3/16 inch balsa. can flag decal obtained at an auto parts CONJECTURE DEPARTMENT Work slowly and you’ll get a smooth, store. John Novak wrote recently and posed good fitting job. When the planking is All control rigging is hidden within this problem: If you could go back in finished, sand the pod to get smooth the structure. To secure the Nyrod tub­ time to 1941 to a free flight contest and contours and then apply the fiberglass ing inside the tail boom, tie a long could take one piece of equipment with cloth and resin. I used resin over the string to a ball o f kitchen sponge slightly you, what would you select? He says he cloth on the outside, and resin by itself larger than the diameter o f the alumi­ thought about taking a T.D. 049 or a on the inside of the pod for strength. num boom. Soak the sponge in resin S.T. 15 or a Starduster, but settled on a When the resin has cured, lightly sand it and then work it into place at the rear pack o f Sig D.T. fuse material . . . I have to remove the fuzzies, and you are ready end of the boom with an arrow shaft thought it over for awhile, and have to begin the covering. and the string. Repeat with another concluded that my choice would either The vinyl material is cut to shape to sponge ball at the front o f the boom. be one o f the super-adhesives that we simulate the actual seam lines between When the resin cures, the tubes will be now have, i.e.: epoxy or Hot-Stuff, or mahogany panels on the original. Over­ firm ly locked in place. To get a small, some o f the quality balsa wood sheet lap the pieces o f vinyl about 1/8 inch neat connection to the flying stab con­ we now have. to prevent the vinyl from shrinking away trol horn, stiffen the brass cable with I would be interested in hearing from from the seams. I pre-shrunk the vinyl solder. When the solder has cooled, any o f the readers with their choices. with a heat gun while it was still in make a “ Z ” bend in the end, and hook Send your suggestions to Bob Stalick, place on its backing sheet. it to the nylon control horn. This will 1120 Shady Lane, Albany, Oregon I stained the mahogany sheeting on enable a solid connection in the narrow 97321. Until next time ... · the wings, prior to gluing it in place, confines o f the sub-rudder. in hopes that the mahogany would show Six servos are used to control the Bowl us ...... Continued from page 13 through the silk and dope. Unfortunate­ Bowlus. One in each wing operates the neat, smooth, joint. If you should drop ly, after covering, the mahogany took ailerons. One is used for elevator, and the wing and break the joints loose, they on an ugly mottled appearance. As a another, coupled into the aileron chan­ can be repaired with Super Glue, Hot result, I used the vinyl material over nel, is used for rudder. A fifth servo Stuff, Zap, or one o f the other cyano­ the silk to get a scale effect. To achieve controls the dive-brakes, while the sixth acrylate miracle glues. a realistic doped linen effect, I used is connected to the wheel brake. Most

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 83 RUBBER POWERED FLYING MODELS N O W ! COMPLETE SELECTION OF OVER 80 PLANS AND DRAWINGS FROM

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lus w ithout any problems. It soars at a å k φ I I A COMPETITIVE READY-TO-RUN CAR realistic speed and the turns have to be FOR THE 1/8 SCALE RACER. $319.95 seen to be believed. The coupled aileron L d b l ! and rudder crank the bird around most Completely assembled, incl. Futaba 2-ch. radio w/FP-S7 servos, Veco .19 eng­ realistically. ine w/heat sink, and all linkages installed. Just add batteries, fuel, and go racing. Since I was a teenager in 1937 I’ve had a running love affair with Baby Bowlus, and at long last I’ve got h e r.. . I’m finally able to ride the ridges and hunt the elusive thermal. ·

C /L ...... Continued from page 35 plane you could fly anything, so why bother with a pokey ol’ Stunt plane? But a few o f us have been trying to mas­ ter the Stunt pattern the last few months and I can finally see the challenge. En­ tered my first Stunt event a couple weeks ago and got a 2nd place in Novice Stunt, so I am primed for building a “ For-Real” Stunt plane this next winter. I have been trying to get into Profile Carrier for a couple o f years but haven’t had a chance to build a plane yet. Not too much Speed activity up here, so I have never considered building one and probably never w ill. Same goes for Scale. In fact, I wonder why anyone even radio manufacturers will make up a minimal amount of elevator movement. bothers with C/L Scale. As far as I am three-way extension cord to allow op­ The tail moment is quite short, and a concerned a Scale plane should be either erating three servos from one receiver lot o f elevator travel is not necessary. F/F or R/C. Comments, anyone? (Oh channel. I have exercised this system, Due to the large stab, the Bowlus is Boy! wen) operating four servos continuously for quite stable in the pitch mode . . . if it is When starting out on something new, thirty minutes, and have used only 1/3 left alone. you are supposed to play it safe and say capacity o f my 500 ma battery pack. The C.G. is at 34-1/2% . . . which all o f the things those before you did. In The wing struts are functional ... as was achieved with 12 ounces o f nose- writing a column for a modeling maga­ a result, stock K&S streamline tubing weight. I use two towhooks, one on zine, this means telling your readers that is not strong enough. I reinforced the each side o f the pod, to eliminate pro­ this is their column and they can make tubing by using a length of 1/8 music blems in towing a glider with such a it whatever they want. And you always wire alongside a length o f 3/32 music deep fuselage. The hooks are positioned ask for lots o f pictures, newsletters, con­ wire. This combination isepoxied inside on the centerline of the fuselage pod, test results, handy hints, etc., etc. the pear shaped tube. Ram a two inch on a line angled 60° through the C.G. You’ve read it before, right? But you length of hardwood into each end o f the of the wing. I tow the model with a five won’t read it in this column. First off, tube, and cut the ends to the appropriate foot long bridle attached to a conven­ this is my column, not yours. I am the angles to meet the fuselage and wing tional winch line or high-start. one pounding the typewriter, meeting smoothly. Then thread a 4 4 0 machine I enlisted Bill Northrop to launch the the deadlines (which are quite rigid, in­ screw through the strut ends to attach Bowlus on its maiden flight. All it took cidentally), corresponding with people the struts. was a firm shove, slightly nose down, around the country, and cashing the Set up the ailerons with maximum o ff the side o f our slope soaring hill. checks. differential. I have approximately 3/4 The Baby flew fine . . . although at that I can use good quality black and inch up travel and 1/4 inch down travel. time it was slightly more nose heavy white pics, but you will send these in if Use maximum rudder travel. This is lim­ that it is now. Since that time, I have you like the column, so why should I ited by the cutout in the stab. Use a both high-started and winched the Bow­ beg for them? Besides, I own a 35mm 84 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER RG'S ‘ P itPak'

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P.O. BOX 406 ST. JOSEPH, Ml 49085 Michigan residents add 4% sales tax PHONE (616) 429-3528 camera and know how to use it. Newsletters can be nice but I don’t think too many clubs distribute them very widely. Again, if you like the col­ umn, you’ll send in your club n/l. I don’t care if I ever get a contest report, unless it is something really big or unusual. Local contests are great fun but this is a national (worldwide yet, Bill?) (Mais oui! wen) magazine and this column just doesn’t have room for list­ ing the winners o f local meets. I just read over the above and can see some people getting ticked o ff at me for coming on kind of heavy. Sorry. I just feel that when a person takes on the responsibility of a monthly column, it is that person’s job to make the col­ umn interesting. If he has to rely on the readers for all of his material, he is doing something wrong . . . Or should be doing something else. I plan on doing my best to make this column something that you will enjoy. If you enjoy it and want to be a part of it, you will contri­ bute to it without me beating you se­ verely about the head and shoulders for a couple o f pictures. How much would you pay for a ...T h e y ’re not $12.00 per plug, and Money, lots of it, if required for a meet glow plug? Latest word from Homer they’re not advertised as blow-proof. Ac­ like this. And Rich isn’t starting out Smith is that you might be paying $12.00 tual price is two for $6.00. Plugs are small. He wants to find a large company per plug before next season! Hang on a made by Fusite Division, 6000 Fernview that will come up with 5,000 to 10,000 minute. You haven't heard the whole Ave., Cincinnati, Ohio 45212. bucks and let MACA spend it on the story yet. As far as the whole story I don’t know exactly what happened biggest Combat meet ever. A lot of goes, I haven't got complete details yet and haven’t felt the need to find out, Combat fliers are ready for a World either, but aren't rumors fun? The rumor but Gary Frost has had some very serious Champs, and it looks as if we are going is that Harry Roe, of Speed fame, is de­ problems lately and is presently unable to have to do it here in the States if it veloping a blow-proof glow plug. The to carry on as president o f the Miniature is ever to come off. We could be years plug supposedly withstands 9 volts, and Aircraft Combat Association. Rich waiting for the British or Europeans to fuel with 5% to 80% nitro. One test of “ von” Lopez is taking over for Gary, add Combat to the Control Line World the plug I would have really enjoyed so MACA hasn’t lost good leadership, Championship contests. seeing. They ran a Supertigre 15 turn­ the leadership has just changed hands. I Rich is also looking for somebody to ing a flywheel at close to 50,000 rpm know that Rich can do a good job for sponsor the 1975 MACA Top Twenty for nearly a minute before the engine MACA. In fact, I was the one who nom­ t-shirts. Last year I talked A AM into puked. The plug was not damaged. You inated Rich for MACA president several sponsoring the shirts but they went can imagine what the engine looked months ago. Rich was second to Gary bankrupt before paying the bill, so like. The plugs won’t be available for Frost in the election, but it could just MACA had to pay for them and it didn’t awhile, so I recommend that you set up as well have been a tie, as both are really do the treasury any good. For anyone a savings account to insure that you into Combat and are willing to do most interested in sponsoring the Top Twenty have the money to buy them when anything to promote the event. t-shirts, it will probably cost around they are released. Right now, Rich is spreading his $140.00 (that’s a guess on my part. It Correction: Since writing the above, ideas on a Combat World Champs con­ cost about $80.00 for 11 shirts last the new glow plugs have been released test, to be put on by MACA, for 1976. year.) and the name o f your company SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 85 and sand. Epoxy hooks in place and V VINTAGE R/C PLANS y ( drill holes for DT line-guide eyelet and snuffer tube, if applicable. Finish fuse­ PIANES WORTH MODELINC lage by covering with tissue and doping R/C MODELS WING SPAN PUN SHEETS PRICE generously. Nose should be epoxy paint­ b-2 5H"mitchell" 71·· 4 $ 13.50 ed to an inch or so aft o f the pylon. “ " PUSTÍC ENGINE COWLS...... PAIR $ 9.00 Dope just won’t stop 50% nitro. Cover CONSOLIDATED PBY-5A ’ CATALINA" 108" 4 $ I 3.50 wing, stab and fin with tissue and apply " PUSTÍC ENGINE COWLS...... PAIR $ 9.00 five or six coats o f thinned dope. The " GUN BLISTERS...... PAIR $ 6.00 last two coats should be plasticized. Now PIPER PA-8 “SKYCYCLE” 60" 3 $ 10. 50 check fuselage for straightness and " " PUSTÍC CANOPY...... EACH $ 8.50 mount fin in line with the pylon. The " " PUSTÍC ENGINE COWL...... EACH $ 7.50 SEND 50 CENTS FOR CATALOG TODAY !! ADD $1.00 POSTAGE PER PUN thick fin will allow for some bend in the fuselage, but the less the better. DISTRIBUTED IN CANADA- DEALERS & DISTRIBUTORS WRITE- R&M SALES,1027 CURKE SIDE ROAD, SID MORGAN,13157 ORMOND A pressurized engine should be used LONDON,ONTARIO,N5Z 3B1 BELLEVILLE, MICH. 98111 for top performance. Pitch and balance the prop and buy or m ix 50% to 60% nitro fuel with 15% to 17% oil. If you normally use a starter, fit the ship with a pacifier tank. The pacifier can be placed ARE PEANUTS YOUR BAG?? to balance the bird by using water to simulate residual fuel. Or use the engine WALT MOONEY OFFERS TWO OF ’EM NOW! tap to pressurize a TD tank (mount). Assemble the heap and balance within an 1/8 inch of indicated CG. ' PLANS BAG* I Preflight checks at home will save a 14 PEANUTS PLUS 2 OTHERS 14 PEANUTS PLUS STAHLWERK short day at the field, not to mention ORD-HUME O H7 · FOKKER V-23 VP-2 · S.E.5 · MICROPLANO VELOZ your nerves and the little dragon. From MEYERS OT.W · LAIRD LC-OE f o r d f l i v v e r · s p e e d s p i t f i r e PHALZ PHOKKER · SLINGSBY DART m i l e s M-5 SPARROWHAWK · DH-6 the nose back; check for left thrust PIPER VAGABOND · GEE BEE D WACO SRE · RENARD R-17 (some) and down thrust (none). Wing PILATUS PORTER· ANDREASON BA-48 SUCKER JUNGMANN . CULVER DART is keyed at 90° to fuselage. Just visible, DH-6 · DRUINE TURBULENT WITTMAN'S VW POWERED RACER washout in both tips, quite visible washin HUNTINGTON H-12 · MISTER MULLIGAN STAHLWERK MK R-IIIB · MONOCOUPE 110 in right main, flat left main. Flat stab PIPER PAWNEE AND PIPER COLT FOSTER WICKNER WICO GM-I ■ > tilted parallel with left main panel. Due ONLY *5.00 EACH (POSTPAID) FROM: WALT MOONEY to wash-in and left tab, he wants to glide 2912 CABRILLO MESA, SAN DIEGO, CA.· 92123 U.S.A. left. Since transition is quite good, I let him. You can force him to turn right, but when he encounters lift he may (and will be on the shirt. How about it Sig? would like to hear from you occasional­ has!) reverse and turn left anyway! Rud­ ly, Howard. Also Kit Gearhart, Bill Allen, K&B? Midwest? Fox? World Engines? der tab a good 1/16 left. It seems a lot Phil Cartier, Paul Smith, John Kiisdonk, M&P? Pylon? Model Builder? It ’s good but isn’t, what with the thick fin. Check advertising, as Combat fliers are generally Tom Southern, Charlie Johnson, Gordon timer and DT action, and o ff to the the most visible people at a contest! Delaney, Jim Womack and a few others field. Take another look at the Bosta built who don’t come to mind right away. Hand glide, looking for a very flat by Steve Sacco. It ’s plenty tricky, with Time to go. I just got a call from glide with a trace o f left turn. Adjust a molded fiberglass leading edge, very Gary Stevens (one o f my team partners) glide with nose or tail ballast and stab little center section sheeting, hollow and he thinks that he is finally ready tilt only. No incidence changes were ribs and the engine set back into the to beat me in some .049 Combat. I’m necessary on the original. leading edge. That is a plane that I gonna go tear him up! See ya next would like to have more details on. How month. · Now take a breath and light-off the about it, Steve? engine as near full power as you dare. Set the timer for 4 seconds, no more. There are a few people around the Firedrake .... Continued from page 53 country who I would like to hear from. At this point we aren’t worried about Kernel Rush, the King of Korny Kombat, When enclosed, it dries very slowly. transition or the glide. Use a short fuse isn’t one to write many letters but I When dry, add the wing and stab mounts in case the glide is stally. Point the nose up at about 60° and just let go. It ’ll go up and right, never fear, but watch how MOVING? SEND NOTIFICATION FIRST! much right. If it starts turning very soon, NAME you need more left thrust. If it moves OLD out in a smooth arc and starts to tighten ADDRESS ADDRESS up at cut off, more left tab is indicated. (Please Print) CITY STATE ZIP Increase engine run in 1 to 2 second increments. Once past 6 seconds or so, NAME the transition will improve. Watch for the NEW right wing dropping and correct with ADDRESS ADDRESS trailing edge shims under the right main (Please Print) CITY STATE ZIP panel. Firedrake should make about 1 turn in 10 seconds, transition with no Change of address notices must be received one m onth before date of issue that new address takes effect Send old address w ith new; old label preferred Post O ffice w ill not stall, and glide left in 40 to 50 second forward copies unless you pay extra postage Duplicate issues cannot be sent. circles. Treat him with respect and he’ll chomp the competition. The MODEL BUILDER, 1105 Spurgeon, Box 4336, Santa Ana, Ca. 92702 HE’S A DRAGON. ·

8 6 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER INDEX TO ADVERTISERS CLASSIFIED ADS Ace R/C Inc...... 3rd Cover A ir tr o n ic s ...... 70 Non commercial: Rate is 25 cents per word with a minimum of S3.00 worth. Commercial: Rate is 40 cents per word with a minimum of $5.00 worth. No American Balsa Corp...... 73 mail-order discount house ads knowingly accepted. Astro Flight, Inc...... 58 A ll ads are payable in advance and may be for any consecutive insertion period Bill's Miniature Engines ...... 58 specified. Name and address free. Send ad and payment to. The MODEL BUILDER Cannon E le ctro n ics...... 68 Classified Ads, 1105 Spurgeon, Box 4336, Santa Ana, California 92702 Carr S a ils ...... 78 Century 21 ...... 61 CUSTOM FIBERGLASS KITS: "Spirit of R/C EXACT SCALE PLANS: Curtiss Hawk Cloudbuster V e n tu re ...... 64 '76". w/Mach I foam cores, $64.95; Kuda or P6E 2 " scale $10.50. Curtiss Hawk P6E Concept M o d e ls ...... 81 Californian w/wing cores, $59.95, Skymast- 1-1/2" scale $8.00. Curtiss Goshawk F11C-2 er. $124.95. Add $15 fo r contest balsa. 2 " scale $10.50. Stinson Reliant SR9 2 ” Jim Crocket Replicas...... 64 Color picture and info, 75d. R B Products, scale$12.50. Add $1.00 for postage. Richard Du-Bro Products Inc...... 67 1874 N. Landen, Camarillo. Ca. 93010. G. Barron 1213 Holly Spring Lane Grand Dumas Products, Inc...... 4th Cover Phone (805) 482-8130. Blanc, Mich. 48439. D. T.C. Design ...... 76 ILLUSTRATED CATALOG RUBBER R/C RACE CARS AND ACCESSORIES E. K. Products, Inc...... 80 PLANS. Peanut, Jumbo scale, intermediate C ATALO G . 1/8 scale U.S. Nationals Cham­ Flyline Models...... 68 scale, sport. S.A.S.E. to : AERO ERA, c/o pion. Delta Manufacturing, Box 27, Lorimor, Flying Scale M odels...... 62 Tom Houle, 11333 N. Lake Shore Dr., Iowa 50149, (515) 763-2220. Mequon, Wl. 53092. Carl Goldberg M odels...... 79 WANTED — Will buy multi-cylinder model Golden Age R e p ro d u c tio n s ...... 76 SAILPLANE DESIGNER'S HANDBOOK: airplane engines. In particular, the older Grycel Paper B o a ts ...... 61 Design instructions, 180 airfoils, 63 designs, spark ignition and certain glow ignition. All 3rd printing, $4.96. Eric Lister, 953 Klock- letters answered. Russel Sprague, 8800 W.C. Hannan...... 84 ner Rd., T renton, N.J. 08619. Green Lane, Randallstown, Md. 21133. Heath Co...... 7th Cover HOBBY SHOP . .. in Oceanside, California. Herb's Model M otors ...... 71 Great for retired couple. $19,950. AACTION Model airplane plans. Peanut, rubber, CO2 . Hobby H id e a w a y ...... 76 gas. Free list. Send self addressed, stamped REALTY 714-722-1421. HRE, Inc...... 82 envelope to: Modernistic Models, Box 6932 HI-FLY ENTERPRISES CONDOR ”800," Burbank, California 91510. Jef's Friends ...... 76 B-C-D free flight, 3 Contest H/L gliders, Kavan Model A ircraft...... 1 NEW for "75"; Sparrowhawk, for unlimited Speed Equipment: Cars, R/C, planes, boats. K&B M fg...... 66 rubber, flown by Bob White. FREE catalog. Hop-up, chrome, ultrasonic cleaners. SASE Kelly Products ...... 74 Hobby Fair, 7212 Vassar Ave., Canoga Park, plus 504. Franny's Chrome, 513 Vesta Place, California 91303. Reading, Pennsylvania 19605. Kraft Systems, Inc...... 2nd Cover Leisure Electronics ...... 82 Leisure Products ...... 78 C ounter...... Continued from page 7 and three matte military colors, may Marine Specialties...... 75 are available in 7x5, and 7x6 versions not be enough. Marlow Engineering...... 58 with the wide blades. Top Flite also TF stresses the fact that it also makes Model Builder/Pana-Vise Contest .... 2 added 7x4, 7x4-1/2, and 7x5 sizes to available Paintable Clear Super Mono- Model Builder Binders ...... 80 their line o f Super Maple props. These kote. This material has all the self- Model Builder Products...... 5th Cover maple props are much tougher than the adhesive, heat-shrinking, fuel proof, pun­ Model Racing Products...... 84 usual wooden Drop and should stand up cture-proof qualities of the pre-colored Model Rectifier Corp. (MRC). . . 8th Cover to the rigors o f racing. Monokote films, but also permits the Walt Mooney Peanuts ...... 86 * * * modeler to apply any common model Sid Morgan (Vintage Plans) ...... 86 J R Sales Co has come up with an in­ paint or dope, to his own satisfaction. M&S L td ...... 77 teresting accessory for R/Cers. Since Since the film is neutral, it requires no Nelson Model Products...... 63 everyone lands to refuel either the plane primer, and once applied, is immediately Bud Nosen M o d e ls ...... 60 or the pilot once in awhile, why not ready for a brushed or sprayed finish of P a n a vise ...... 71 ‘refuel’ the flight batteries? The Battery the modeler’s choice. Polk's H o b b ycra ft...... 66 Medic does just that. Operating o ff a * * * John Pond O.T...... 74 standard 6-volt lantern dry cell, the Bat­ Applied Design Corporation has just Proctor E nte rprise s...... 71 tery Medic recharges the flight batteries announced its new Mini-Glue Tip, which Raceplanes...... 65 while you are refueling. The unit incor­ is molded to fit most all glue bottles RC Buyers G u id e ...... 72 porates an automatic sensing circuit to and tubes. The fine, tapered spout al­ REMCO ...... 83 tailor the charge rate to the flight pack’s lows precision glue control and place­ RG's R /C ...... 85 needs. It can recharge up to 300 milli- ment. Rocket City Specialties...... 70 amps if necessary, but cuts back to a Tips can be used over and over, since Satellite C ity ...... 69 safe 50 ma level when nearing full they are made of polypropelene material, Scott Research...... 64 charge. Included is a test light to moni­ and dried glues can usually be "popped” Shamrock Competition Imports ...... 65 tor the condition of the charging battery, out by flexing. By heating, the tips can Sig Mfg. Co...... 6th Cover as well as an indicator light to test the be curved for even more precise control. Sonic-Tronics, Inc...... 74 condition o f the flight pack. If the air­ The introductory price is $1.00 for Special Edition P la n s ...... 69 borne battery does not have the mini­ 4 tips, from Applied Design Corp, 5531 Sterling M odels ...... 59 mum safe voltage to fly . . . the test light Shoreview Drive, Palos Verdes Peninsula, Sullivan P ro d u c ts ...... 75 will not come on. The Battery Medic is Calif. 90274. Su-Pr-Line Products...... 81 available for $14.95 from JR Sales Co., * * * S.C. M o d e le r...... 85 1316 N. Mill, Bowie, Texas 76230. In the May "Over the Counter,” an Tern A e r o ...... 60 * * * incorrect statement was made regarding Top Flite M o d e ls ...... 57 Top Flite Models, Inc., suppliers of the FIBR Double Rudder Outdrive Unit, VL Products...... 64 Super Monokote, the stuff that has by Marine Specialties. The FIBR Unit Victor Model Products ...... 78 revolutionized the covering and finishing may be modified by trimming for single Vintage Aero ...... 58 of models in recent years, is still willing rudder usage. The Variable Outdrive Vortex Model Engineering...... 77 to concede that there are times when Assembly is another and entirely d if­ Peter Westburg...... 65 its choice o f 10 opaque colors, three ferent part, which sells for $19.95. The Williams Bros...... 83 metallic colors, four transparent colors, HBR-1 is the single rudder unit ($29.95) World Engines...... 69

SEPTEMBER 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 87 STICK 'EM PATTERNS FULL-SIZE PLANS No. 675-O.T. DIAMOND DEMON $2.50 SERVICE Popular .020 Replica of Bay Ridge cabin Complete sets o f pressure sensitive patterns Cl. B job. Span 34". By Phil Bernhardt. provide "printed wood". . . on your stock . . (with instructions) for selected MODEL BUILDER plans. Press No. 5751 FLEET BIPLANE $4.00 all patterns for ribs, bulkheads, tips, etc., on proper thickness sheet balsa or plywood, Fast-building 2" Sport Scale R/C model No. 9751 BABY ALBATROSS S8.00 and cut ’em out! No tracing, no transferring, of famous 1930 bipe. By Romey Bukolt. Exact R/C scale model o f famous Bowlus no plans tearing, no inaccuracies. Just like sailplane. Span 122". Col. Bob Thacker. No. 5752 SEA FURY S3.00 making up your own kit with printed wood. No. 9752 FIREDRAKE $3.00 Semi-scale model of WW II British fig h t­ "Stick 'em Pattern" numbers correspond to Half-A free flight featuring fast climb, er, for 1/2A R/C pylon. Jerry Holcomb. plan numbers. Order with plans and they'll flat glide, penetration. Larry Sicuranza. be mailed together . . 3rd Class. Add 504 No. 5753 GREMLIN $2.75 per set to m ail patterns 1st Class. No. 975-O.T. PURSUITEER $4.00 Sharp little Half-A C/L Stunt model. Will Smart looking 1938 Pete Bowers design. do complete schedule. By Tom Dixon. CALIFORNIA RESIDENTS ADD 6% TAX. Span 6 0 ", area 575. By Phil Bernhardt. No. 775-O.T.SP BOMBSHELL $3.25 No. 575-O.T. MERCURY S4.00 No. 575-O.T.SP MERCURY $3.25 Designed by Ben Shereshaw, kitted by No. 11743 SP "C-QUELL" $3.95 Scientific. 72" span. By Phil Bernhardt. No. 1174-O.T. SP LANZO STICK $1.95 No. 8751 SOPWITH TABLOID $4.00 No. 4751 R/C AUTOGYRO S3.50 No. 91074-O.T.SP BUHL PUP 54.95 Sport Scale WW I biplane fo r 3-channel No. 874ISP WOODY PUSHER $1.95 radio. Span 4 2 ", .19 eng. By Chris Moes. Semi-scale tw in rotor R/C autogyro for .35 engines. Very stable. By Skip R uff. No. 874-O.T.SP POWERHOUSE $3.95 No. 8752 VOLKSPLANE $1.50 No. 7741SP CURTISS A/12 SHRIKE $3.95 Great performing rubber powered profile No. 4752 OKIE BIRD $3.50 No. 774-O.T.SP OUT Ό SIGHT $2.45 scale. Span 2 4 ". By John Oldenkamp. Red hot Class A/B free flight. Plans show No. 6741SP TRIXTER BEAM $2.95 sub fin and rear fin types. By Jim Clem. No. 674-O.T.SP RED ZEPHYR $3.95 NO. 8753 FRITZ, HLG $1.00 No. 12711SP CURTISS WRIGHT Jr. $3.95 A pylon style, high performance HLG, No. 475-O.T. G.H.Q. SPORTSTER $4.00 No. 574 O.T.SP T D COUPE $2.95 with DT system. Different! Jim Parker. From July 1936 M.A.N.. also kitted by No. 11731SP BIG JOHN the FIRST $5.95 G.H.Q. By Louis Loutrel. Phil Bernhardt. No. 875-0.T. '38 MOFFETT CHAMP $3.00 Watch this space fo r more patterns to come. Canadian Roy Nelder's beautiful rubber No. 3751 CURTISS F9C-2 S6.00 ship. A real classic. By Phil Bernhardt. Navy airship-based "Sparrow Hawk" bi­ plane. 1-1/2" scale C /L. Charlie Sm ith; No. 1751 R/C TYRO TRAINER $3.00 No. 7751 LITTLE BOMB 52.50 Powered glider with removable .049 pow­ M inim um area 1/2A pylon racer fo r tw o No. 3752 CALL AIR SNOWCAR S2.50 er pod/hatch. Span 74". By Hank Cohan. channel radio. By Wm. R. Nielsen, Jr. Radio controlled, semi-scale prop-driven snow car, .30- 40 engines. Fred Sanford. No. 7752 THE ALIEN $2.50 No. 1752 BEACH'S FLYER $2.50 No. 3753 GROOVY TUNA S2.50 Pendulum controlled flying wing pusher Stagger-wing-bipe,canard-tracter for .049 Top-notch Wakefield design from 1973- for Brown CO power. Daniel Walton. Super-simple, but wild! By Kloth/Beach. 2 1975 FAI U S. team member. Jon Davis. No. 7753 ULTRA DART $2.00 No. 375-0.T. 1936 WAKE WINNER S2.00 No. 175-O.T. FLYING QUAKER $5.00 Monster 3 9 " span Delta Dart fo r sport Englishman Albert A. Judge's Wakefield First gas model kit by Megow, 1937. and Unlimited Rubber. Dave Linstrum. Cup design. Redrawn by Phil Bernhardt. Span 7 ft. Redrawn by Phil Bernhardt. No. 775-O.T. BOMBSHELL 54.00 No. 2751 TOP SLIDER S3.50 Famous winner of Class C gas at the '40 R/C Slope Racing glider. Will sport fly in Nats, by Joe Konefes. Phil Bernhardt. light winds without ballast. Ken Willard. Price includes 3rd Class postage and reprint of building instructions (if any). Add 454 No. 2752 CUT LESS S2.50 No. 6751 SQUARE HARE R/C $3.00 PER PLAN fo r 1st Class postage. Add 504 A ll sheet balsa trainer w ith long history. Half-A R/C Pylon Racer for 2 ch. radio. fo r overseas orders (except APO's). Span 52", .19 power. By Bill Northrop. Elevator and aileron. By Dave Katagiri. Send self-addressed, stamped business size No. 6752 SKYFARER $2.75 No. 2753 FORD TRI MOTOR $2.00 envelope for free copy of complete plans list. Rubber powered 1 " scale model o f trike Super-light rubber scale model of famous CALIFORNIA RESIDENTS ADD 6% TAX. geared high wing cabin. By Earl Stahl. T in Goose, 32VS" span. By Tex Newman. SEND TO: No. 6753 SHRIKE $3.00 No. 275-O.T. MYSTERY MAN S5.00 Hot Half-A free flight, with good looks, Famous Elbert Weathers Class C gas job. MODEL BUILDER PLANS SERVICE and top performance. Bill Langenberg. Used takeoff dolly. By Phil Bernhardt. 1105 SPURGEON, BOX 4336, SANTA ANA, CALIFORNIA 92702

and HBR-2 is the Double Rudder Unit available from this new establishment is more than competitive with the TD $34.95). are 1/12 scale electric powered R/C cars. glow powered versions. The control con­ * * * Based on the jerobee gasoline powered sists of proportional throttle, dynamic M&S Limited, P.O. Box 39745, Los R/C cars, Leisure Electronics units have braking, and steering. Angeles, CA. 90039 has updated its 72 been converted to electric power. The Careful handling and experience is inch span Avatar slope and thermal soar­ resulting ease of operation for beginners, needed before you can drive the Vette ing R/Csailplane. The new model, which and those not experienced in the starting to its full potential. Jamming on full sells for $32.95 has a redesigned fuselage, and running of glow engines, is obvious. throttle simply results in wheel spinning 550 sq. in. wing area, and features an Another plus factor is the elimination “ ground loops,” which will also happen 8 to 12 hour construction time. All of noise. If you let o ff too suddenly while going hardware is also included. All balsa and The (Dodge) Challenger car is for fast and the brakes take over. Accelera­ plywood parts are machined, ribs are general sporting around and can be run tion far outstrips the glow powered cars, contour-sanded. Write for free catalog in confined areas. Maximum speed is which tend to load up when they slow o f all items, including the 100 inch span around 8 mph. The control consists o f down for curves. “ Curio” standard class sailplane, and the forward, off with braking or reverse, The “ Greenwood Vette” uses re­ “Pea Pod,” easy-to-build, plywood­ plus steering. These run about 3 hours chargeable car batteries, and the com­ hulled 36/600 sailboat. on dry batteries, and sell for $179.95 plete units, with charging cord to fit * * * with a Futaba FP-2F radio system, or automobile cigarette lighters, sell for Roland Boucher, formerly with Astro $139.95 with the Jerobee radiosystem. $219.95 (Futaba FP-2F radio) and Flight, has now started a new company, The “ Greenwood Vette” complete $179.95 (Jerobee radio). All units em­ Leisure Electronics, 11 Deerspring, Ir­ with glued and trued wide racing tires, ploy dry battery transmitters. · vine, California 92705. The first items is designed for racing competition, and * * *

8 8 MODEL BUILDER IN THE BEST CIRCLES, IT’S itlie r 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 fitte d 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 your dealer, or order direct. Dealer inquiries are invited. PRODUCTS All direct orders sent postpaid in U.S. MODEL BUILDER California residents add 6% sates tax. 1105 Spurgeon, Box 4336, Santa Ana, California 92702 HDUBHR TRAINERD TEACHES THE NOVICE TO FLY LIKE A CHAMPION

COMPACT SIZE ENGINES: .35 to .50 WING SPAN: 51 In. SPEEDY CONSTRUCTION WING AREA: 550 Sq. In. LENGTH: 45-1/2 In. KIT RC-35 SMOOTH CONTROL RESPONSE A carefully tailored design that will do every stunt in the book- even the lomcevak - and yet is not difficult for low-time pilots SUPERB AEROBATIC PERFORMER to handle. The wash-out incorporated into the foam wing allows the model to be slowed down to a walk for the landing approach and flared onto the runway in a main-gear-first FOR 4-CHANNEL RC EQUIPMENT touchdown without undue stalling or snap-rolling tendencies. The Kougar is highly recommended as an introduction to low- BUILT-IN ANTI-STALL STABILITY wing flying and AMA pattern competition.

SYMMETRICAL WING SECTION KIT FEATURES: Precision Cut Foam Wing Handy Printed Fuselage Sides - Build Directly on the Wood Formed Plastic Fuselage Top SIC'S BIG NEW CATALOG! Jet Style Canopy with Molded Framing "The Modeler’s Wishbook” Molded Plastic Cowling Sheet Balsa Wing Covering Every workshop needs our latest Catalog. Over 260 Sheet Balsa Tail Surfaces pages devoted to Sig kits and supplies, plus practic­ Rugged, Ready-Bent Landing Gear ally all other lines available. For sale at your local Die-Cut Plywood Parts hobby shop or send S I.50 for your postpaid copy. Step-By-Step Instructions TO ORDER KITS AND SUPPLIES: See Your Dealer Isometric Assembly Drawings First! If he cannot supply you. order direct. Add S1.00 U.S.A.F. Thunderbird Aerobatic Team Decals postage and handling in the U.S.. $1.50 in Canada. Minimum order is $1.00 Send check or money order. HARDWARE PACKAGE INCLUDES: No C.O.D. Prices subject to change without notice. Molded Control Hinges Double check to be sure you have included your name, Nylon Control Horns address and zip code. Nylon Nose Gear Bearing Nylon Nose Gear Steering Arm k i f λιλμ ιιλγιιιι ι Tuf-Steel RC Links 4 : \<; m : Aluminum Motor Mounts Wire Aileron Horns 4D1 S. FRONT STREET MONTEZUMA, IOWA 50171 Nylon Screws for Bolt-On Wing Attachment New Heathkit Pack-17 R/C Systems the instant way to change frequencies

New 5&8 channel single & dual stick systems have 17 plug-in frequency modules.

No more wasted flying time, standing around at the field waiting the time-consuming point-to-point wiring, transmitter Pack-17 for your frequency to open up. With Heath’s new GD-1205 and frequency modules that are fully assembled. And the main cir­ 505 Pack-17 systems you can operate on any of the 17 R/C cuit board swings out to simplify adjustments and servicing. frequencies with just one transmitter and receiver. Just plug the Pack-17 for any open frequency into the transmitter and Save money, build them yourself. Kit GDA-1205-S, 8-channel, receiver. In an instant, you're ready to fly. single-stick transmitter with one module, $159.95*. GDA-1205- D, 8-channel, dual-stick transmitter with one module, $139.95*. All Pack-17 transmitters and receivers are compatible . . . you GDA-505-S, 5-channel, single-stick transmitter with one mod­ can even interchange frequency modules. And you'll enjoy ule, $139.95*. GDA-505-D, 5-channel, dual-stick transmitter these deluxe features as standard equipment... 4 of the chan­ with one module, $129.95*. GDA-1205-2, receiver with one mod­ nels have trim adjust, relative power meter, trainer-link socket, ule, $59.95*. GDA-1205-3, receiver battery pack, $9.95*. Addi­ nickel-cadmium batteries for transmitter are included, plus a tional transm itter modules, $17.95* each (assembled). charger that handles all batteries simultaneously. The great Additional receiver modules, $11.95* each. GDA-1205-6 trainer new receiver has full 8-channel capability and uses Pack-17 link, $9.95*. modules. The new servos have stronger cases, sturdier gear­ ing, and gold-plated contacts. Save even more on complete systems. $44.70 on 5-channel Another Heath first. . . no more servo centering problems. systems with modules for one frequency and $49.60 on 8-chan- nel systems with modules for two frequencies. All four systems Pack-17 systems include a precision alignment circuit that al­ include the receiver battery pack. lows you to easily check centering to a 1.4 millisecond standard.

Pack-17 systems are easier to build, too. Uncrowded circuit Write for your free Heathkit catalog and get all the details on layout, prefabricated wiring harness that eliminates much of the new Heathkit Channel-Pack systems. It's the only way to fly.

HEATHKIT ELECTRONIC CENTERS- Units of Schlumberger Products Corporation Heath Company, Dept. 238-09 HEATH Retail prices slightly higher. Benton Harbor, Michigan 49022 Schlumberger I ARIZ.: Phoenix; CALIF.: Anaheim, El Cerrito, Los Angeles, Pomona, Redwood City, San Diego (La Mesa), Woodland FREE □ Please send my free Heathkit Catalog. 1 Hills; COLO.: Denver; CONN.: Hartford (Avon); FLA.: Miami NEW □ Enclosed Is $ , plus shipping. (Hialeah), Tampa; GA.: Atlanta; ILL.: Chicago, Downers Grove; IND.: Indianapolis; KANSAS: Kansas City (Mission); Heathkit Please send modelfs) 1 KY.: Louisville; LA.: New Orleans (Kenner); MD.: Balti­ ϊ more, Rockville; MASS.: Boston (Wellesley); MICH.: De­ Catalog - Name troit; MINN.: Minneapolis (Hopkins); MO.: St. Louis I (Bridgeton); NEB.: Omaha; N.J.: Fair Lawn; N.Y.: Buffalo Address (Amherst). New York City, Jericho (LI.), Rochester, White describes over 400 Plains; OHIO: Cincinnati (Woodlawn), Cleveland, Colum­ money-saving kits City State Zip bus,Toledo; PA.: Philadelphia, Pittsburgh; R.I.: Providence you can build. Send PRICES A S PECI PIC AT IONS SUBJECT TO CHANOC WITHOUT NOTICE. (Warwick); TEXAS: Dallas. Houston; VA.: Norfolk (Va. aHAIL ORDER PRICES! Γ .Ο .Β . PACTORY RC-111B I Beach); WASH.: Seattle; WIS.: Milwaukee. for your copy today. [, You don’t need a flying field to enjoy R/C! Most 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 WM 2500 WOODBRIDGE AVENUE Off An R/C EDISON, NEW JERSEY 08817 just for the fun