THE BIG RACE . . . get out­ side and create your own Indy 500. Make the course Enjoyable as big as you like and as tough as you can this baby can take it. It’ll navigate turns moments in sports with ease as the differential gears keep you in command control. The rubber tires grip MROTamiya’s Electric R/C Porsche Kit any surface and hug the cor­ ners. Shock absorbing front A driving success story everywhere it goes end and rugged ABS plastic body will keep you away ... and it goes everywhere from pit stops. And you'll learn for the first time the R/C modelers are using the MRC-Tamiya Porsche Turbo capability of the powerful RSR to take part in a whole new world of radio control electric motor. driving enjoyment. They’re recreating the excitement of an Indy 500, the precision timing of rally races, the burst TIMED FOR A RALLY . . . pre-set the speed you need. of excitement associated with a drag race and the sheer Now set out and match the clock around the course you satisfaction of running a challenging obstacle course. select. Timing is important and the Porsche will get you And what's making this all possible is this soldidly de­ there just on time. Create your own rules. Let the proto­ signed, magnificently engineered MRC-Tamiya Porsche typical rear suspension take your road or driveway course Turbo radio control car. It’s a bold combination of MRC in stride. electronic technology and Tamiya's studious attention to IT’S A DRAG . . . lay some tape. Beat the stopwatch or precision· engineering and realistic details. drag. Watch the MRC-Tamiya Porsche peel out and stop Not a finicky toy, but a solidly on a dime. Set the gears for the space you have and the built vehicle, it’s one of those speed you need. This cars versatility is astounding. It'll rare kits that while simple do ’’tricks" no other R/C car can match. enough to assemble provides performance the radio control hobbyist can relate to and ap­ preciate. PUT SOME OBSTACLES IN YOUR WAY ... set up your own mini pylons and let this MRC- Tamiya Porsche's true propor­ tional steering, semi-pneumatic tires and differential gear help you take tight turns like a cat This GT racer can dish il out and take it. Delrin gears keep . . . literally run rings around the you on the move day in and day out. And depending on competition. So precise is its the use you choose you can run it with dry cells or set it control and turning radius that up for rechargeable nickel cadmium batteries. Make no you can build an entire obstacle mistake about it there are only two Porsche Turbo RSR's course in little more than a one available that offer this kind of flexibility and enjoyment meter wide area. .. . and the other one costs thousands of dollars. And they both look the same. MRC-Tamiya’s version is a great INDOOR CONTROL . . . change gear ratios . . . you can replica from rear air foil to headlights and racing mirrors, set them anywhere from 4.6/1 to 19.4/1 . . . and start the attention to authenticity is stunning. having fun in the house. Here the clean, quiet electric We suggest you drive over to your hobby dealer and drive motor gives you the control you need around tight cor­ away with an MRC-Tamiya Porsche R/C kit, you’ll find a ners. Setting speed and gear ratios you can match the lot of friends already on the road. All of them enjoying space you have indoors no matter how limited or con­ their own memorable moments in sports. voluted. There are two forward and two reverse speeds to choose from . . . meaning you can put it in reverse and back into self-made parking spots with ease.

Send $1.00 for MRC 1977 Model Aircraft Products Catalog in Color ★ ★ ΤΑΜΓΥΑ Specifications: Length: Over 14". Width: Over 7". MODEL RECTIFIER CORPORATION Gears: Four. Speeds: Two 2500 WOODBRIDGE AVE. Forward. Two Reverse. EDISON, N.J. 08817 CG RETRACTS W IN /st $rá$ti\ af77 NATS / Dave Brown Dave used a World Engine's Flying as many contests as / do, one would expect to retract servo and a 2" white spend considerable time Goldberg "Snap-on” spinner. maintaining the retractable Both Salkowski and Oddino gear system. However, used S & O retract servos with since / started using the Goldberg mechanics. Goldberg landing gear Iwhen ■they first came out) / have had to spend very little time to maintain them allowing me to concentrate my time on flying. They are lite-weight, strong, reliable, and economical. The only thing they lack is snob- appeal. I f you need a status symbol, buy others. If you need good, reliable, long lasting landing gear, which will perform 1st Place Winner Dave Brown under grueling contest condi­ with Phoenix 7. Won the '77 tions, use Goldberg's. Nationals in R/C Pattern.

3rd BILL SALKOWSKI with his Curare 5th JIM ODOINO with his Curare CG RETRACTS are the simplest, toughest, most reliable retracts you can buy» Power them with your radio system retract servo. Or with the popu lor air cylinder set-up made by Sonic Systems. Or use our powerful Retract Servo System described below. See your dealeři

CG RETRACT TWIN GEAR Retracts...... RG2 - $1435 TRI-GEAR Retracts...... RG3 - $24.95 RETRACT POWER SYSTEM NOSE GEAR lOnly)...... RG1 -$ 1 0 .0 0 SERVO BATTERY BOX (IN W ING)

Our m all, powerful Mrvo it called by experts the best retract servo made. It's geared down for heavy Γ CARL GOLDBERG MODELS. INC w ork, w ith thick strong output gears. Easily handles I tri-gear retracts w ith power in reMrve. Special 4736 W Chicago Ave.. Chicago, IL 60651 switching system oomes wired up, needs only 2 I I am sending 35< tor 12 pg illustrated pencells. good for many hundreds of retract cycles Complete weight 3 02. RPSI --$29.95 I Catalog with Basic Explanation of R/C Equipment and Radio Control Definitions

CARL GOLDBERG MODELS. INC. Name _ Address 4736 West Chicago Avenue · Chicago, Illinois 60651 City__

S tate__ Zip For best seme* se« your dealer for items A L L IT E M S A V A IL A B L E IN C A N A D A you want II r>ot available write direct Add 50« per item (SI 00 outside U S ) THE RUNNING RADIALS

The world’s only production precision hand built radial 5 and 7 cylinder engines.

SPECIAL NOTICE! We have just learned that because of a temporary production set-back, delivery of the 5 and 7-cylin­ der Hargrave Radial Engines will be delayed until early January, 1978. As these w ill probably cont­ inue to be the only production model radial eng­ ines available, we expect you'll be just as anxious then as you are now to own one.

7-cylinder engine 1.18 cu. in. 24 ounces $695.oo

EN 58 stainless steel valves, phosphor bronze valve guides and seats. Nitride hardened cam discs. High carbon hardened and tempered cam followers. Nitride hardened tappets and rockers. Twin ball races, Nitride-hardened cylinders. Perry carburetor. Each cylinder bore .625", stroke .551'/ displacement . 169 cubic inches.

5-cylinder engine .846 cu. in. 18 ounces $545.oo

California residents add 6% sales tax. MODEL BUILDER PRODUCTS 621 West Nineteenth St., Costa Mesa, California 92627

■ Impossible to fly a paper glider with radio control? Well, we are not suggesting it. Impossible to make an airborne system so small and lightweight that you might consider flying a paper glider with it? Not at all impossible, in fact that’s what we’ve done. Kraft Systems, long time pioneer in the field of R/C, is proud to announce the first truly sub-miniature servo, and ^ the world’s smallest, the KPS-18. Measuring 1.103” x .514” x 1.2” and weighing only .582 oz., this servo has the accuracy and dependability inherent with all Kraft servos. Combine this sub-miniature servo with the KPR-7L receiver, and the KB-4L battery pack and you will be able to put a Kraft R/C system where you never thought it possible.

Write for Free Catalog

450 West California Avenue 5* P.O. Box 1268 / y ' M Vista, California 92083

KPS-18 Servo Static Torque...... 13oz.in.(.936Kg-cm) with 20 ohm motor Transit T im e ...... 0.6 seconds for 100* rotary travel Available Outputs .. . Rotary arm or wheel KPR-7L Receiver Usable Sensitivity...... 3uV Selectivity...... + 3.5KHzat6db + 9KHZ at -60db Image Rejection...... 7...... -3db Spurious and Harmonic Rejection...... -60db min. Temperature Range...... 0-140* Semiconductors___7 Bipolar Silicon Transistors 4 Silicon Diodes 2 Integrated Circuits KB-4L Battery Pack...... 225 MAH Full Size Drawings

37.0mm

30.48mm

411 oz.(receiver)-!- 2.328 oz.(4 servos)-»-1.954oz.(battery) + .282 oz.(mini switchhamess)= 5.975 oz.TOTAL WEIGHT Leaders in the field for over 30 years, K&B Engines continue to dominate 14 First Places out of 20 events in which they were entered in the 1977 AMA Nationals.

The National AMA Helicopter champion, John Simone, Jr.. Powered his Rev-Olution II with a K&B .61 R/C. It led the pack of 34 entries. K&B Engines hold a total of 20 out of a possible 24 NAM8A records In Class A and Class B events, plus one in the XH Class.

The K&B 3.5cc (.21) R/C took the impressive! We think it is, but we're still not FIRST TEN PLACES in satisfied. Though K&B Engines have proven ALL THREE EVENTS at the First themselves champions in each of these four above fields, World R/C Car Championship. we at K&B continue to strive to improve 92 out of 108 entries were powered their quality and achieve greater performance. by a K&B 3.5cc R/C engine. You can depend on it, K&B is your engine of today. . . and tomorrow!

K&B MANUFACTURING DIVISION OF AURORA PRODUCTS CORP. 12152 WOODRUFF AVE., DOWNEY, CA. 90241

2 MODEL BUILDER FINISH OF CHAMPIONS NATS BEAUTY AWARD WINNER USED SIG DOPE Ted Fancher of Foster City, California chose Sig Supercoat Dope for his beautiful CL Precision Aerobatic Stunter. This superior finish and dec­ oration job was awarded the PAMPA “Concours d’Elegance” cup for the most beautiful stunt model flown at the 1977 Riverside Nationals. The “Cita­ tion" is also an excellent performer, gaining Ted a 3rd place tie in the hotly contested open event. Photo by Wynn Paul SIG SUPERCOAT DOPE Fuel Proof Model Aircraft Dope Light Red Diana Cream Tennessee Red Brilliant White Lemon Yellow Dark Green Cub Yellow Forest Green Polar Gray Brite Green Jet Black Olive Drab Dark Blue Metallic Blue Miami Blue Metallic Green Light Blue Metallic Maroon Orange Silver Maroon Brite Gold Low-Shrink Clear Dope Brown Brite Copper HIGH GLOSS Pint Clear ...... $2.59 SIG LITE-COAT DOPE Pint Color ...... $2.79 BUTYRATE DOPE Pint Thinner ...... $1.59 * PREVENTS WARPING 4 Ounce Clear . . . . $ .89 Quart Clear ...... $4.29 * LIGHTWEIGHT 4 Ounce Color . . . . $ .95 Quart Color ...... $4.59 4 Ounce Thinner . . . $ .65 Quart Thinner . . . * HIGH GLOSS . . . $2.65 8 Ounce Clear . . . . $1.49 Gallon Clear ...... $10.95 . $ .89 LC-OOl 4 Ounce 8 Ounce Color . . . . $1.69 Gallon Color ...... $11.95 . $1.49 LC-003 8 Ounce 8 Ounce Thinner . . . $1.19 Gallon Thinner . . . . . $ 6.95 LC-004 Pint . . . . $2.59 . $4.29 LC-005 Quart . . ALL COLORS AVAILABLE IN 4 OZ., 8 OZ., PINTS. QUARTS AND GALLONS HIGH GLOSS LC-006 Gallon . . $10.95 COLORS ARE MIXED IN A LOW SHRINK BASE BUTYRATE DOPE USE SUPERCOAT THINNER TO THIN LITE-COAT SUPERCOAT CLEAR IS IN A REGULAR SHRINK BASE

SUGGESTIONS FROM THE SIG FACTORY FLIERS ABOUT FINISHING WITH SIG DOPES To prevent warps and excessive pull down of planked areas. fill the gram further and provide a base for color dope. Sand Sig Supercoat Color Dope and Lite-Coat Clear are made with between coats with 220 to 360 Tri-M-lte Finishing Paper ^ S IG S f a low shrink base. They should be used on open framework Remove as much as possible of the sealer in the sanding pro­ covering only after the required amount of covering shrinkage cess. but be careful not to cut into the covering material. Two has been obtained with one or more coats of Supercoat Clear coats of Sealer are generally enough Apply a coat of clear SANDING SEALER Dope, which is in a shrinking type base Use Lite-Coat as the before color doping. It is possible to use all clear dope as a only clear dope on rubber powered and other small models. base for color without using Sanding Sealer Clear can also be FOR FILLING WOOD GRAIN, Solid sheet balsa or sheet balsa covered models, whether sanded between coats. SILK OR SILKSPAN covered with paper, silk, or not. can use Lite-Coat as the only Supercoat Color Dope should be thinned with 10% or more clear dope. (From this point we will refer to clear dope, which Supercoat Thinner for brushing This helps prevent brush IN BUTYRATE DOPE FINISHES can be either regular or Lite-Coat. depending on whether marks and gives smoother coats Flow on wet coats and avoid SL-001 4 Ounce . . . $ .98 you need shrinkage or no shrinkage.) Covering all exposed rebrushing back over an area already painted For spraying, wood with silk, silkspan or similar material is recommended SL-003 8 Ounce . . . $1.75 thin dope about 50 - 50. Add more thinner if the dope does to strengthen the wood and prevent splitting and cracking SL-004 P in t...... $2.89 not go on evenly. The covering makes an ideal base for a finish. Sig Retarder can be used in place of part of the Supercoat To prepare a balsa framework, either open or planked, for Thinner when the humidity and/or temperature is high The covering, apply two coats of clear dope to the wood surfaces. Retarder slows down drying action and prevents ''Blushing" Sand lightly after each coat is dry to remove any raised grain RUBBING or turning white It also helps in spray mixes when ' orange- or fuzz. The bottom of the wing is a good place to start cover­ peer surfaces result from the dope drying in the air on the ing. Cut a piece of material about 1" larger than half of the wing with the gram running lengthwise. Dip in water and ap­ way to the part. COMPOUND ply. Work around the edges, pulling out all of the wrinkles Painting the entire model white is recommended for a good and stretching it smooth. Brush around the outside edge color base, particularly when white is part of the color scheme. Absolutely necessary for obtaining a mirror with clear dope. It will soak through the covering and adhere Color coats can be sanded with 360 Tri-M-lte or 400 or finer finish on any dope surface. Fast cutting to to the dope already on the structure After drying, trim off wet paper. When using masking tape for trimming, seal the produce professional results with a mini- the edges with a sharp, double-edged razor blade Go over edge with a coat of clear dope to prevent the color dope from any edges that have not adhered with more dope The top bleeding under the edge. Don't leave the masking tape on mum ol effort. half is done in the same fashion except that the covering any longer than necessary The longer it is on. the harder it RB-001 4 Oz. Medium - should be brought down over the edge and lapped over the $1.55 sticks. Complete the job with several sprayed coats of clear RB-002 material on the bottom of the leading edge and over the back over the color scheme This seals the colors and adds gloss. 4 Oz. Fine - $1.55 of the trailing edge Other parts of the model are covered For a smooth, realistic finish the final coat may be rubbed RB-003 4 Oz. Very Fine $1.55 in similar fashion. Brush on two or more coats of clear dope to down with Sig Rubbing Compound. After applying the decals, fill the grain and/or obtain desired shrinkage protect them and the finish with wax For best results, it is RB-007 8 Oz. Medium - $2.69 not a good idea to try to piix different brands of paint. Use RB-008 8 Oz. Fine - $2.69 For a prize winning finish. Sig Sanding Sealer may be used to SIG products from the start. RB-009 8 Oz. Very Fine $2.69 See your dealer first! To order direct, add $1 postage under $10, postage free over $10. No C.O.D. SIG MANUFACTURING CO. . . Montezuma, Iowa 50171

JANUARY 1978 3 OLDIES (but still goodies;) MOST BACK ISSUES OF "MODEL BUILDER" ARE STILL AVAILABLE, THOUGH SOME ARE IN SHORT SUPPLY. ORDER NOW, WHILE THEY LAST! PRICES VARY ACCORDING TO QUANTITY REMAINING IN STOCK. NOTE SPECIAL ANNIVERSARY PRICES LISTED BELOW!

November 1971 December 1971 January 1972 Nancy, R/C soarer. Curtiss-Wright Junior SHOCer F/F by Mel R/C Pattern World R/C 2" scale. Schmidt. Championships. R/C Twin Trainer White Trash, famous Peanut Fokker D VI. 75" span, for ,40's. R/C soarer. LSF Tournament story. Peanut Laird LC-DC. Peanut Ord-Hume. Bi-Prentice, R/C bipe Volksplane 3V-1 Chet Lanzo's famous trainer. 3-views. rubber Puss Moth. How to build light Curtiss Robin 3-views. "w ire" wheels.

Vol.1.No.2 $3.00 Vol. 1, No. 3 S2.00 Vol. 2. No. 4 $1.00

February 1972 Mar/April 1972 May 1972 Minnow U/C profile Yankee Gull R/C glider Seahorse II, R/C sea­ scale racer. 8' to 12" span. plane. For .19-.35. Fokker E-Ill R/C scale. Miss Cosmic Wind, QM D.H. Humming Bird, Al Vela's E-Z Boy 1/2A R/C Pylon racer. F/F or R/C pulse. E-Z Boy 1/2A, Al Vela. Peanut Scale Bucker Peanut Fokker V-23. Peanut Ford Flivver. Jungmann. Whetstone 1/2A U/C Fiberglassing over balsa, Siebel 1/4A F/F scale. combat. by Le Gray. Mr. Mulligan 3-views. Ryan ST 3-views. Spoiler, FAI Combat. FAI power "Folder.” Tethered Cars, R/C sail.

Vol. 2, No. 5 $3.00 Vol. 2, No. 6 $1.00 Vol. 2. No. 7 $2.00

June 1972 July 1972 August 1972 Bob White Wakefield. Fairchild 51, 1" scale, Bonzo standr ' R/C Mongster QM biplane R/C or F/F. sport p v ^ “ scale. R/C pylon racer. SAM-5 A/2 Nordic. Counterf' O ail less Calif. Coaster R/C 1912 Avro G rubber. A/1 Λ Jic. glider. Sheet wing. Comanche C stand-off Shoes· s / R/C QM. Three profile Peanuts. R/C scale. Pear X ) ay lore raft on Deperdussin 3-views. Travelair 2000 2" scale ‘ V also big one. Pesco Special 3-views. R/C, by Editor. Fairey Delta 3-views. Chester Jeep 3-views.

Vol. 2. No. 8 $3.00 Vol. 2, No. 9 S4.00 Vol. 2, No. 10 S4.00

Feb/March 1973 April 1973 May 1973

Profile F4U Corsair C/L Fabulous PEA POD, Bantee mini-pattern R/C stunt, .40 power. R/C sailboat. 3channel, .19 power. Beecroft's Satan, Class A Briegleb BG-12, scale Woodwind A/2, all sheet free flight. R/C soarer. covered wing. Indoor Ornithopter. R/C Spirit of St. Louis, Slope soaring technique. Peanut Travelair 2000 semi-scale, .049 .09· Teakettle, twin-boom PT-3 Scale Views. Peanut Volksplane CO2 pusher. Thermal hunting with Finish painting of rub­ Peanut Monocoupe 110. R/C gliders. ber scale models. Aerbo, .020 Replica. OT Vol. 3, No. 16 $2.00 Vol. 3. No. 17 $3.00 Vol. 3, No. 18 $1.00 m...... Mar. 75 2.001 ) Put a check mark ( ) by the back issues you SPECIAL ! ! ! j Apr. 75 2.00( ) wish to order. Magazines will be mailed by Sec­ May 75 3.00( ) ond Class, postpaid. Foreign orders (except MODEL BUILDER MAGAZINE'S j Jun. 75 1.251 ) Canada, Mexico, FRO, APO) add 204 per copy. • 5th ANNIVERSARY BACK-ISSUE SALE ! I j Jul. 75 ·1 .2 5 ( I Allow about four weeks for delivery. If United Aug. 7502.001 ) Parcel Service (UPS) is desired, add 8Cty mini­ • ANY ISSUE MARKED WITH "o" 75 Cents! j Sep. 75 01.251 ) mum for up to two magazines, or add 804 plus Oct. 75 01.251 ) lOtf for each additional magazine on orders for • ANY ISSUE MARKED WITH " ·" 50 Cents! * Nov. 75 01 251 > Dec. 75 01-251 ) three or more. Send check or Money Order (no k ...... * cash, please, and no COD’s). A facsimile of this Jan. 76 01.501 ) order form may be used. Nov. 71 $3.00( I May 73 01.001 ) Apr. 74 01.001 ) Feb. 76 01.501 ) Dec. 71 2.00I ) Jul. 73 · 1.001 ) May 74 1.00< ) Mar. 76 01.501 ) Name:______- ______Aug. 7 3 * 1 .00( ) Jun. 7 4 « 1.00( ) Apr. 7601.501 ) Jan. 72 01-001 I Sep. 73 «1.001 ) Jul. 74 01.00< ) May 76 1.501 ) Feb. 72 3.001 I Oct. 73 «1.001 ) Aug. 74 « 1.001 ) Jun. 7 6 0 1 501 ) Address:______M/A 72 · 1.00( I Nov. 7301.001 ) S/O 74 «1.001 ) Jul. 76 01.501 ) May 72 2.001 ) Dec. 73 «1.001 ) Nov. 74 01.001 ) Aug. 76 1.501 I City: ______State: Jun. 72 3.00( ) Dec. 74 01.001 I Aug. 76 to date / Jul. 72 4.00I ) Jan. 74 01.001 I each 1.501) ' ZIP: F/M73 2.00I I Feb. 74 «1.001 ) Jan. 75 0 2.001 ) PLEASE PRINT Apr. 73 3.001 ) Mar. 7401.001 ) Feb. 75 2.001 ) MODEL BUILDER, 621 West Nineteenth St., Costa Mesa, Ca. 92627

MODEL BUILDER JANUARY

MODEL# 1978 BUILDER volume 8, number 73 621 West Nineteenth St., Costa Mesa, California 92627 Phone: (714) 645-8830

STAFF CONTENTS

EDITOR FEATURES Wm C. Northrop, Jr WORKBENCH, Bill Northrop ...... 6 GENERAL MANAGER 7 Anita Northrop OVER THE COUNTER, Eloy Marez . REMOTELY SPEAKING, Bill Northrop 14 EDITORIAL ASSISTANT Eloy Marez CHOPPER CHATTER, John Tucker . 17 ASSISTANT GENERAL MANAGER R/C PYLON, Jim Gager ...... 20 Edie Downs PRODUCTS IN USE, Eloy Marez . 22 ART DEPARTMENT PLUG SPARKS, John Pond ...... 24 Chuck Blackburn PRODUCTS IN USE, Phil Bernhardt 30 Al Patterson OFFICE STAFF PRODUCTS IN USE, Eloy Marez . 32 Georgi Gilleran MODEL ROCKETRY, Douglas Pratt ...... 34 Ron Hutto R/C SOARING, Dr. Larry Fogel ...... 40 Pat Patton A Valcarsel R/C POWER BOATS, Bob Preusse ...... 42 Mike Whitney STRICTLY SAIL, Rod Carr ...... 43 CONTRIBUTORS BUILDING 1/12 SCALE CAR, Dan Rutherford 44 Rod Carr Douglas Pratt CONTROL LINE, Dan Rutherford ...... 46 Larry Fogel Bob Preusse F/F SCALE, Fernando Ramos ...... 52 Chuck Hallum Fernando Ramos HANNAN'S HANGAR, Bill Hannan .. 54 Bill Hannan Larry Renger FREE FLIGHT, BobStalick ...... 58 |im Gager Char Rohring HALF-A SCENE, Larry Renger ...... 62 Walt Mooney Dan Rutherford THERMAL DETECTING, Jean Andrews 67 John Pond Bob Stalick John Tucker SCALE VIEWS ADVERTISING REPRESENTATIVE WEST: Bob Upton, 20626 Clarendon GREAT LAKES TRAINER (Part 2), Peter Westburg 37 Ave., Woodland Hills, California 91364:1213)884-2294 Subscriptions $15.00 per year. $27.50 for CONSTRUCTION two years. Single copies $1.50. Add $2.50 for postage per year outside of U.S. (ex­ STINGER, R/C FORM 1, George Baynes .. 10 cept APO). Add $1.00 for Canada and Mexico. MADMAN — C/L, O/T, R/C, Floyd Carter 27 Copyright 1977 by MODEL BUILDER PEANUT FOLKERTS SK-3, Kurt Enkenhus 48 Magazine. All rights reserved. Reproduc­ tion without permission prohibited. CO 2 MOSKITO, Jack Headley ...... 55 Published monthly by MODEL BUILDER CANARDART, Dave Linstrum 64. Magazine, 621 West Nineteenth St., Costa Mesa, CA 92627. Phone (714) 645-8830 Change of address notices must be re­ ceived one month before date of issue that new address takes effect. Send old address with new: old label preferred. Cover: Winner of MODEL BUILDER'S 1977 Parcel Post Proxy Peanut Grand Peanut Post Office will not forward copies unless award, a Kraft KP-3 radio control system, was Kurt Enkenhus, Silver Spring, Maryland, you pay extra postage. Duplicate issues who built this superb model of the Folkerts SK-3 "Speed King". It set a P.P.P.P. cannot be sent. endurance record of 2 minutes, 3 seconds, in a gym with 30 foot ceiling. Construction Second Class postage paid at Costa article begins on page 48. Kodacolor negative by Kurt Enkenhus. Mesa, California, and additional offices. JANUARY 1978 5 PHOTO BY PHOTO ANITA NORTHROP

f r o m

B ill MB's editor, with Hans and Hanno Prettner, soon after the award ceremonies at the 1977 Las Vegas Tournament of Champions, where Hanno was winner for the 4th time in a row, earning N o r t h r o p ' * a beautiful trophy, and this year, a check for $13,000. He is truly the best in the world. We are happy to have Dick aboard, were to be sure to fuel proof the fuel w o r k b e n c h and feel that his experience and compartment and to wrap the batteries • · · knowledge will contribute to the and receiver in plastic. I've been building future growth of our publication. and trying to fly for about four years now. ALESSON AND A HINT In all that time, I've used epoxy to fuel WELCOME ABOARD The following is taken from the proof and have always wrapped my bat­ We are pleased to announce the November 1977 "Crab Rag” , news­ teries and receiver in plastic. I've heard addition of Dick Tichenor to the letter for Maryland's Chesapeake Bay of others having problems with fuel leak­ Model Builder staff. Dick, as assistant Radio Control Club, Inc. (love those age into the plane, but it always hap­ to the editor, will be involved in a hot steamed crabs!). It's the "Tip of pened to ‘the other guy'. Well, the other wide variety of duties related to the the Month” , by Tom Obringer, and evening it finally happened to me! monthly production of our magazine. consists of a very important lesson "I filled the tank as usual and pro­ Dick brings to us a background of that everyone should learn, and also a ceeded to take off and enjoy a normal some twenty years with various model very handy hint for anyone using glow flight. Part way through the flight, the publications as a photographer, writer engine power. engine quit and I had to land dead- and model designer. His model "I think some of the first tips I received stick. I connected the fuel pump and building interests started in the early when I started to build my first R/C plane found that the tank was empty. Then I 1930's and have covered almost every made my first mistake; I refilled the tank. category of modeling. His first R/C Even though I felt something was wrong aircraft was built in 1950, and after with the previous flight, I still proceeded the crashes, repairs and fly-aways to fly instead of checking for the fuel tank attendant with the primitive tube type problem. Again, as with the first flight, control equipment, the radio found a the engine quit after about a quarter of a more practical home in a stern paddle- tank. wheel tow boat that he designed and "The lesson is right here. Model air­ built. planes, in their own way, call tell you Dick has a particular interest in when something’s wrong! The catch is models of new and unorthodox de­ that you have to recognize their method signs. His latest design is a R/C stand­ of communication. Think back on some off scale Cessna Citation I, powered of your ‘surprise’ problems. How many by a pair of ducted fan units. The times have you realized that your model jet can be added to his list of designs gave you a warning that something such as pushers, insects, etc. wasn't right, before it actually happened Along with his modeling activities, . . . and at the time, you ignored it! Dick was employed in the aerospace "This time, after landing, I decided to industry for some 35 years, working investigate the source of the problem. in engineering, program management, Upon removing the wing, I could see the marketing and subcontracting. Some evidence of the problem; the bottom of of the programs on which he worked the fuselage was covered with fuel. The included Space Shuttle, Apollo, foam rubber used to support the fuel F-111, F-104, B-70, F-8U-1, B-36, tank, batteries, and receiver were com­ Dick Tichenor, having his last cigarette before F-9, F-4, P-38, P-47, Stinson 105 and joining the non-smoking staff of MODEL pletely fuel-soaked. It was a real mess. SR-10. BUILDER Magazine. Continued on page 110 6 MODEL BUILDER OVER THE COUNTER

The Specialist Eight, by Millcott Corp. • In case you hadn't noticed, or have characteristics. been trying to ignore the fact, 1978 Alpha is an ideal small size trainer is upon us. Ace R/C, never one to and sport airplane, economically be until Toledo time, but in the one ignore anything in the small airplane priced at only $19.95. flying season that has passed since its field, has released its first 1978 kit, the If you like to keep track of how introduction, the Specialist Eight, by ALPHA. things go in our hobby, we'll give you Millcott Corp., has firmly established The Alpha is a sporty looking tri­ something to watch out for. Notice itself amongst competition flyers, the cycle gear high-winger for .049 to .09 how long it is before you start seeing most discriminating of all. This sys­ engines. It has a span of 40 inches, ALPHA'S at your field. It won't be long, tem has a number of interesting pluses, an area of 250 square inches, and a or at least no longer than the first including such standard features as flying weight of approximately 25 good flying weather for you unfor­ three maneuver buttons, dual rate, and ounces. Two or three channels can be tunates in the Northlands. Tell Ace we a control panel for adjusting all flight used. were "fustest with the mostest" when Lite plywood fuselage construction you ask for more info or order your and a aouble-sparred foam wing add $1.00 (refunded first order) catalog. up to fast and easy construction with Ace R/C, Inc., Box 511, Higginsville, maximum strength and flyability. The MO 64037. flat-bottom high wing provides stable * * * flight, with slow speed and slow glide It is not quite a year old, and won't

The "L i'l Dolphin", designed and produced by Steve Muck for the K&B 3.5 Outboard, or in­ Vintage Aero's 1977-78 catalog. boards up to 3.5 cc.

JANUARY 1978 7 Heat sink for the OS 25 FSR and engine mount for the OS 60 Four- Winner of the 1/12 Scale Electric Class D. 6-cell outdoor event at the Cycle glow engine. 1977 ROAR Nats, available, complete with radio, from JoMac.

The OS 45 Marine RV, from World Engines. Super-Tigre Schneurle 60 w ill be available from World Engines.

controls. and tail rotor in a helicopter. By spe­ vator and aileron stick-to-servo travel According to the manufacturer, this cial order, the three functions can be at the flip of switches, is also avail­ is the only radio available with an set up to interact electronically. able. But, to carry it one step further, optional electronic mixer in the trans­ The Specialist Eight comes with an your Specialist can be ordered with its mitter. Mixing action takes place at interconnect cable that can be con­ Exponential Rate as an extra, no­ your switched command, and can be nected from the transmitter to the re­ charge option. With Exponential, the used not only for the normal Vee-tail ceivercharge receptacle. You can thus user can have a non-linear distribu­ or rudder/elevator mixing, but can read receiver battery voltage on the tion between stick and servo. Tailored also be factory-adjusted for uni­ transmitter's expanded scale volt­ to your individual airplane and pre­ directional intermix of two servos. meter. By turning on the receiver ference, the aircraft's reaction time be­ This method permits coupled ailerons switch, you can then operate all con­ comes less sensitive around neutral, and rudder, for example, with normal trols, check your retract gear, open the yet, unlike dual rate, still has full rudder operation, although it would throttle, set the trims, etc., all without servo travel available at full stick be engaged when ailerons are used. It actually putting a signal on the air. throw. is possible to couple elevator and The normal type of dual-rate con­ Proper control placement; servo re- flaps, or even throttle, collective pitch, trols, which readjusts the ratio of ele­ Continued on page 100

Craft-Air's plastic bodied Bull Pup and molded polyethelene field The DAMO FS-218, from Sweden, box. See page 30 for full review on the Pup. 8 MODEL BUILDER Fiberglas parts for 1/8 scale sprint car, from Auto Research, Inc. Completed Auto Research 1/8 scale sprint car.

Versatile glue from Wilhold is excellent canopy and hinge glue. r

Extruded cockpit coaming and strut fairings from Fourmost Racing Products.

Small two and three-cylinder steam engines, from Polk's Model-Craft Hobbies. New large rocket engine from Centuri.

JANUARY 1978 9 PHOTOS BY DAVE GIERKE & GEORGE BAYNES Formula 1----— Stinger Formula 1 By GEORGE BAYNES . .. Aside from being a proven winner, this ship has the additional feature of being entirely independent of manufactured foam or fiberglas structures. A good hobby shop has all you need. • The Stinger was designed with took the U.P.R.C. Season Points Ontario) are too rough for torsion thoughts of having a Formula I racer Championship with his Stinger, and I bar type wire landing gear. When I that performed well and also looked won the High Point Canadian Per­ happened to see the three-views and different from the rest, both on the petual Trophy at the Canadian Na­ pictures of the full size Stinger, it ground and in the air. On both tionals with mine. seemed like the answer to my land­ counts, I believe I have succeeded. I had previously built and raced ing gear problem, and it had a semi­ I have been racing with Stingers three of |oe Foster's "Sharks", which elliptical wing for a distinctive for three seasons now, but 1977 was appeared in M.A.N., mainly because appearance. its best year. At seven U.P.R.C. races of its distinctive appearance. The Being a shoulder wing plane, the run during 1977, Stingers racked up Shark handled well in a race, but the tempered aluminum landing gear a score of one first place, six second grass runways we fly from in this would be solidly mounted in the places, and one third place; failing area (United Pylon Racing Circuit, fuselage, and solid it is. I have bent to place at only one race. Dave Kelly Western New York and Southern the landing gear almost double a couple of times, in disgustingly slop­ py landings, with never a trace of stress cracks, or any other damage to the fuselage. Takeoffs from grass or asphalt are a cinch, no rudder, a slight amount of up elevator, and it's off in six feet or less. Landing after a race is where the Stinger really shines. The ailerons are just as effective at landing speed as at full speed, and having a long flat glide path, it can be held a foot or so off the ground for 200 feet or more, until speed drains off, resulting in a very nice two-wheel landing with no tendency to nose over. CONSTRUCTION It is assumed that anyone tackling a Formula I model has enough Wing structure is simple and rugged. After placing bottom sheet and main spar, ribs are easily building and flying experience under shaped into triangles from sheet stock. Forward portion is a 1 x 3 solid balsa plank. his belt to have his own favorite 10 MODEL BUILDER Dave Kelly and his Stinger at the 1977 Canadian Nationals. Designer George Baynes with his Stinger at the 1977 Canadian Nats, where he won the High Point Canadian Perpetual Trophy. building methods. Therefore, this pin it in position, using a small tri­ The trailing edge is best glued with discourse will be quite basic. Indi­ angle to make sure it is flush with epoxy, as a water-based glue could vidual preference will determine ad­ the edge of the sheeting and at a cause warping. hesives used, radio installation, cowl 90 degree angle. After drying overnight, the wing mounting, finishing methods, and the When the spar has set, the ribs are can be removed from the building like. made thusly: at each rib station, a board, and the top wing skins WING square-cut piece of 3/32 sheet of trimmed at the trailing edge to match The Stinger wing is built very sufficient dimensions is placed in the the bottom skins. much like the Shark wing in )oe rib position, butted firmly against the The leading edges are cut from 1 x Foster's excellent construction arti­ spar. With a ballpoint pen, mark it 3 inch medium-soft balsa to the out­ cle. The main changes are the lead­ at the top of the spar and the taper line shown. After notching the rear ing edge outline, aileron placement, line 3/4 inch ahead of the trailing surfaces for the plywood dihedral and the sheeting being 3/32 rather edge. Using a straight edge, draw a brace, they are glued to the front than 1/16. line connecting the two marks, of the spars, level with the bottom of Butt glue two 4 X 24 inch pieces of cut along this line, and there is your the wing. Cut the wing tips from 3/8 medium hard 3/32 sheet for each rib. Glue it in place and go on to the inch balsa, and install. Epoxy the wing skin. After drying, cut the two next. The center rib is cut from 1/4 1/8 plywood dihedral brace in place, bottom skins to the outline shown on inch balsa. fill the rest of the notch with 1/8 the plan and taper the last 3/4 inch After all the ribs are in place and inch balsa, and add the 1/8 sheet down about 1/64 at the trailing edge. the glue is dry, the top skins are filler which brings the center portion Mark the rib locations on the out­ applied. They are cut 1/8 inch over­ of the leading edge up to the spar side. Pin or weight the two bottom size along the trailing edge, and are height. skins on a hinged building board set sanded to match the bottom skins With a balsa plane and sanding at the dihedral shown on the plan. later. You will need plenty of weights block, shape the leading edges to the Cut the spar from 1/8 hard, spread over this while the glue is airfoil shown on the side view and straight-grained balsa and glue and drying, as the top surface is curved. work the wing tips down to blend

Side-port K&B installation in Kelley's Stinger. It says, "Davies go Clean installation of K&B rear exhaust 40 in George Baynes' ship. for it prop," on blade closest to camera. Note lever for hand operation of cut-off. JANUARY 1978 11 FULL SIZE PLANS AVAILABLE - SEE PAGE 112 with the rest of the wing. At this ot' the wing as shown on the plan. aside. The remaining 1/4 inch strip point, the whole wing should be Draw another line 1/4 inch ahead of is cut away and replaced with a 1/4 sanded smooth using a sanding block this and repeat both lines and aileron X 3/8 inch hard balsa rear spar. with medium paper. outlines on the top surfaces. When in place, the rear spar must be Using the aileron outline on the The ailerons and the remaining in­ shaped to match the top and bottom bottom wing skins, draw a line along board trailing edges are cut separate­ wing surfaces. Be very careful not the aileron leading edge to the center ly from the wing structure and set to round off the rear corners.

Dave Kelly with the U.P.R.C. Season High Point Trophy. Kelly twiddles the needle while Baynes checks the RPM's with the Heath tachometer. Where are your ear protectors, George?

12 MODEL BUILDER Kraft radio installation in Kelly's Stinger.

EK radio installation in Baynes' Stinger.

Top view of fuselage in radio compartment area. Wing is permanently attached, so radio access is through bottom hatch. Note blind nuts for landing gear and hatch attachment.

Install the 1/8 inch aileron torque rods in 5/32 tubing, and epoxy them in position. Use a straight edge on the bottom wing surface to be sure all is true and straight. Ailerons can be made from 3/8 inch medium balsa, or you can re­ move 1/4 inch from the leading edge of the built up pieces previously removed, replace with 1/4 inch sheet, fill in the ends, and sand Partially completed wing, with aileron ready for attachment. Entire model may be built from to shape. materials obtainable at a good hobby shop . . no foam or molded fiberglas. Now is the easiest time to fiberglas the wing, before it is built into the zontal and vertical center lines to jig, the elevator and rudder control fuselage. I like to use 3/4 oz. cloth facilitate alignment. cable tubing can be installed. Make and K&B finishing resin. The fuselage is best assembled in­ sure both ends are firm ly secured FUSELAGE verted in a fuselage jig. Align the and properly aligned. Make right and left fuselage sides former and firewall center lines Now the 3/16 bottom sheeting from 3 /1 6 x 4 inch sheet. Cut to the drawn on the sides, and get every­ and the 1/4 inch plywood landing outline shown on the plan. Contact thing square and true, especially the gear mount can be glued in place. cement the 1/32 plywood doublers firewall. Any side or down-thrust is The radio compartment and fuel tank in position and mark a full length definitely not required. Slow-drying compartment hatches can be fitted center line and the former locations epoxy is best for installing the fire­ and mounted next. Remove the fuse­ on the inside of each side. The 1/4 wall and formers. Before installing lage from the jig and plane and sand inch balsa fuel tank compartment the firewall, mark and drill for motor the belly into shape. triplers and 1/8 inch plywood land­ mount bolts, and install blind nuts. The wing is now installed. The ing gear mount braces are now con­ Also drill fuel line holes and engine flat-bottom airfoil makes the inci­ tact cemented in place. shutoff cable hole. dence alignment easy. The leading Before cutting out the formers and When the epoxy has set-up, and firewall, mark them with both hori­ with the fuselage still inverted in the Continued on page 86 JANUARY 1978 13 The realistic appearance of large scale models comes through in this photo by John Preston. Extensively modified "M r. Mulligan" Nosen kit by Kirby Crawford. NVRC, is powered by 1.6 cu. in. chain saw engine converted by Kirby. White pine replaces balsa in fuselage construction. desire to excel. When we lack either the desire to work harder or the basic skills required to do the job, the first thought is to divide the competition and therefore have a better chance to R/C News, by BILL NORTHROP win. Who cares about the added administrative burdens placed on con­ test management, added cost to the PREVIEW OF A PROPOSAL most R/C pattern contests, there seems sponsors, added workload on host The following discussion was sent to be only one contestant who is clubs, and all other similar problems? to us by Horace Cain, Buffalo Grove, satisfied with the overall management . .. Who cares? ... I DO!! Illinois, and summarizes a more de­ and judging, etc., and thinks it was a tailed proposal which he intends to good meet? This is normally the first- "The present four classes of pattern submit to the R/C Contest Board place winner. are auite adequate for our sport. They sometime prior to the September "All gripes, complaints, and other need not be changed, but one minor 1, 1978 deadline for 1980-81 rules ill-will can be eliminated by giving revision would make them better ac­ complish their design task, and allow proposals. each contestant his own class. Of We assume this material may also course, there is no competition but contest management more flexibility be published in other magazines, as everyone is happy, or are they? in the application of the classes. our copy obviously came from a "If the lack of competition turns you "The four classes of R/C Pattern duplicator, but we feel the content off, why is there so much talk about should provide a pyramid of profi­ is of sufficient interest to warrant over­ adding another class and/or restricting ciency. At the top of this pyramid are exposure. Anything that can stir up certain equipment. Simply because the gifted few . . . the Masters . . . more interest in competition, par­ we all know that we must encourage those who set the pace, determine and ticularly in the lower skill levels of participation, yet we want to FEEL prove equipment and techniques, and pattern, deserves all the attention it competitive in any contest. Regard­ set the fashions. Just below them are can get. less of how much fun it is to fly in a the Experts . . . those who also possess "Have you ever noticed that after contest, we still possess that inner a high degree of proficiency and use

These happy Texas HOT MACs really put fun in their Fun Fly. See text for some details of intersting events.

14 MODEL BUILDER Hanno Prettner has won the Circus Circus Tournament of Champs for 4th consecutive year. He teams up with father, Hans.

Tournament of Champions winners (I to r): Gunter Hoppe, 4th; Stacey Mitchell, of Newton, South Australia, is hanging in there with Wolfgang Matt, 2nd; Hanno Prettner, 1st; Dave Brown, 3rd; and Leo O'Reilly's 1/5 scale "Circe" R/C sailplane. The Circe has a 3.5 Ivan Kristensen, 5th. meter (138 inch) wingspan. the latest fashions in equipment. Be­ good sport flyer with an airplane contestant. Now he starts working low the experts are a large group capable of looping and rolling again. It is the Novice pilot who must called Advanced, because they have maneuvers should be able to enter a be baited, then hooked and kept on risen above the novice stage through Novice contest and feel competitive, the line. even while competing against pilots hard work and a competitive attitude. "Novice fliers fly lots of sport, They are improving their skills and are with more advanced equipment. mingle with other club members, try using modern equipment and tech­ "In the course of competition, new equipment, and generally sup­ niques. Master and Expert pilots fairly well port the sponsors who make contests "Below this Advance group lies decide their choice of equipment and feasible. The Master may decide what the base of the pyramid, and the foun­ stay with it. Advanced flyers still ex­ the manufacturer will make, but it is dation of pattern, the Novice class. periment and still need some motiva­ the Novice who keeps the production It is the Novice flyer who is the new tion to continue on course. Generally, lines moving and creates the volume blood that must flow in the life- they get motivated when a previous production that the manufacturer stream of this sport, and most im­ Novice moves up and either beats or requires. portant, he supports the industry. Any places close to the older Advanced "Novice Pattern must (1) attract JANUARY 1978 15 Prettner uses a variety of controls, such as these spoilers, to perform some of the Tournament's unique maneuvers.

Bill Bennett awarded top honors to Bob Nelitz in the Tournament's There is a lot more gadgetry on the bottom side of Prettner's Scale division. Bob's world champion OH Chipmunk was tops again. Curare. The unusual spoilers are shown extended. those sport fliers who have not yet uses. ONLY BONUSES . . . NO one or two points in each maneuver. been motivated to the use of the latest PENALTIES . . . would be used. For The main thing is that the scoreboard pattern fads, (2) allow the Sunday example: Fixed landing gear, plus will reflect a much closer total score. flier's sport aerobatic machine to be 10%; engine less than .45 cu. in., Now Joe feels good and is thinking competitive while not restricting any plus 5%; wing chord line over 1 inch about building one of those 'Super other equipment, and (3) motivate the above thrust line, plus 10%; conven­ Master-Magoomi' and show that Jack more serious competitive flier to tional muffler less than 6 inches long, a thing or two. Jack is thinking about rapidly advance to a higher class. plus 5%; flat bottom wing, plus 20%; moving on into Advanced and getting "The solution presented here is only no ailerons or other controls on wing, away from those 'Sunday Fliers'. The to define the thesis of the 'BONUS plus 20%. Maximum bonus points host club got another entry fee, a spon­ POINTS PLAN.' Hopefully, the pro­ will not exceed 45%. sor w ill probably sell another kit, posal that will be presented for the "If Joe Flywright pilots his 'Kaos 40' Pattern has another convert, and 1980-81 AMA rulebook will be much in the local 'AA' pattern contest, he Novice Pattern has served its purpose. more elaborate and TESTED. could pick up 20% bonus points. Jack "In no way will this plan create a "A Bonus Points Plan would give Hotrock, with his 'Super Master- class of 'Trainer Pattern'. Good pilots a Novice pilot a percentage of his Magoomus' will still most probably with good equipment will continue to flight score based on the equipment he win, as he only needs to beat Joe by win . . . and advance . . . yet, espe­ cially on local levels, better sport fliers will be much more inclined to enter their Sunday-Flying Super Kaos, Mach I, etc., and try their luck. Any old fisherman knows that many a fish is hooked when just playing around with the bait. R/C fliers can easily be hooked on pattern when they get a taste of it. Bonus Points rules in Novice pattern is the tasty bait. "Pattern Fliers, think about it on the basis of the good of the sport. Let us not bureaucrat this area of our favorite activity with additional classes; let us not burden our hosts and sponsors with unnecessary expense and work; let us not resort to negative rules that limit and/or discriminate against indi­ vidual initiative; but do let us revise in a positive manner those rules that should be as modern as our equip­ ment. Do let us use the present classes as they should be: Novice . . . to bring West Coast 1977 QM winners (I to r): Dale Yaney, 1st; Nick Nichols, 2nd; Ron Russel, 3rd; Eloy Marez, 4th; Bob Root, 5th. All flew "L i'l Cobra", kitted by R/C Etc. Continued on page 105 16 MODEL BUILDER Tom Knerr flying his Revolution helicopter to a 1st Place win in Intermediate at the 2nd Annual East Coast R/C Helicopter Championships. Choppers on the ready line belong to Faye Peoples and Charlie Sjobeck. This and other Champs photos by BiBi Phillips. CHOPPER CHATTER By JOHN TUCKER PHOTOS BY AUTHOR UNLESS NOTED

SECOND ANNUAL EAST COAST R/C classes respectively. It appears that souvenir plaque. HELICOPTER CHAMPIONSHIPS___ quite a few pilots have graduated to Quite a variety of helicopters was by HORACE HAGEN • the Intermediate class. flown. We had 7 Jet Rangers, 5 Revo­ The contest was again well sup­ lutions, 4 Heli-Babys, 3 Alouette ll's, 2 • The 2nd annual East Coast R/C ported by the hobby industry. The Sharks, a Hughes 500 with Alouette Helicopter Championships took place single largest donation was a Revolu­ mechanics, a Hughes 500 with Jet on August 14, 1977. The contest site tion helicopter kit, and it was awarded Ranger mechanics, and 2 Scratch- was a beautiful 35 acre grass field for first place in the Expert class. Every builts. Most of the helicopters were located in Thompson Park, Lincroft, contestant, except for the first through powered by Schnuerle ported engines. New Jersey. fifth place trophy winners, received a I would like to thank the members of At dawn of the contest day, the weather looked threatening. There was a solid cloud cover, but it had not rained for several hours. However, it was not to last. During the first round of competition, the rains did come. Contestant Wally Rodriguez got caught by a downpour in the middle of his flight, but continued until he finished all the maneuvers. It was a valiant effort, and so was the effort of judges Larry Davidoski, Mike Pilla, and Dick Robbins, who endured the same downpour. We did complete the full round of competition by continu­ ing to fly in between showers. The total entry this year was 25 con­ testants. We had 16 entries in the Novice class, 6 in the Intermediate class, and 3 in the Expert class. Last year we had 14, 1, and 4 entries in the Pilot's briefing by CD Horace Hagen (facing camera, left of center) at the 2nd Annual East Novice, Intermediate, and Expert Coast R/C Helicopter Championships. Proposed AMA rules were used. See more in text. JANUARY 1978 17 damage was minor and non-critical, however, it was irritating when it happened, and there was always the risk of a resulting crash. Recognizing the problem, Kavan mailed out a modification kit to all owners. The mod consisted of a small steel plate which is cemented to the top of the stabilizer see-saw, thus limiting the movement of the paddle system to where it could not strike the canopy. Unfortunately, this also limited the ability to perform abrupt maneuvers upon demand, and the little choppers' responses were much slower. Wanting both performance and smoothness, I machined out a 30 mm extension from mild steel, that could be installed between the top end of the main rotor shaft and the main Gene Rock's scratch-built helicopter, foreground, is a machinist's delight. Chopper was flown, rotor hub, thus giving an additional but not entered, at the East Coast Championships. inch of clearance above the canopy. Of course, the push-rods had to be the Monmouth Model Airplane Club AMA EXPERT CLASS who came out to help run the contest, 1st Ernie Huber lengthened the same amount to make and the Monmouth County Park Sys­ 2nd Faye Peoples it all line-up. Now I could remove the 3rd Rafph Dalusio tem for letting us hold the contest in steel plate mod and regain the control movement which had been lost. Thompson Park. With a little bit of luck, maybe next year's contest will • · · The first trial flight was a revelation see some good weather, for a change. in that, not only did it maneuver beau­ The contest winners are tabulated ALOUETTE II UPDATE tifully, but it also exhibited an excep­ below: It never ceases to amaze me how tional degree of stabiity which it did AMA NOVICE CLASS well the Kavan Alouette II helicopter not have originally. This "extra bene­ 1st Charlie Sjobeck adapts itself to the demands of its pilot, fit" undoubtedly comes from increas­ 2nd Don Chichester and how easily it can accept small ing the pendular effectiveness, by 3rd Joe Mazzamodifications without drastic changes suspending the body a greater dis­ 4th Frank Alicandro 5th LennyLabella in its performance. One such modifi­ tance from the rotor hub. To further cation, which I have not previously simplify the installation, Franz Kavan AMA INTERMEDIATE CLASS 1st Tom Knerr mentioned, is the lengthening of the machined a new, longer shaft to 2nd Wally Rodriguez main rotor shaft approximately 30 mm replace the original one, thus elimi­ 3rd Les Stone to provide additional clearance be­ nating the extension adapter. I haven't 4th AlLobaito tween the main rotor stabilizer yet installed the new shaft, but plan to 5th Ron Palmerpaddles and the plastic canopy and/or do so this next weekend, and will keep scale engine. The first production you posted on developments. I flights soon revealed that in certain wouldn't be surprised if Kavan made it "hard-over" stick positions, the stabi­ available on special order, or as an lizer paddles struck either the canopy optional accessory. In the meantime, top and dinged it pretty badly, or made the photos in this article will show a contact with the scale jet engine, comparison between the two shafts, which is mounted just above the tail and also the installation of the adapter boom assembly. In both cases, the unit on my Alouette. You might also

Kavan Alouette II rotor head modifications. Friction is reduced by using this universal joint between the transmission and the tail rotor Read text for detailed explanation. drive shaft on the Alouette II.

18 MODEL BUILDER details, see the photos in this issue and also the Oct. '76 issue of MB. Another much needed change is the Alouette cooling fan shroud. The orig­ inal shroud was molded from thin plastic material and usually shattered on the first landing unless it was installed with extreme care. If I re­ member correctly, our first Alouette modification was to fabricate a heavy- duty fiberglas shroud (Oct. '76 MB photo), which solved the problem completely. A new shroud is now in production and will be available shortly from Kavan, and features the same heavy-duty construction and rigid structure as indicated in the photos. MORE ON CONTROL RESPONSE One last item before we close the shop for the day. It concerns the con­ trol inputs to the main rotor blades to achieve certain desired results. A few Special main rotor shaft for Alouette II is months back, we talked about chang­ longer than standard shaft at left in photo. ing the control response on R/C model helicopters in general, and another might be better to compromise this article dealt with a super-stable system distance with something about half­ Alouette II belly pan now has pads for strap­ for the Jet Ranger. This month, I'm way between the original position and ping on landing gear struts. going to include a photo which should the swash-plate. This may be accom­ plished by removing the arm, cutting it notice that I have cut two small “ slits" give you a few ideas for the Alouette shorter, and reinstalling the ball at the in the main rotor hub where it bolts to chopper. Specifically, I'm referring to the "Bell System" push rod which runs new position. Of course, you will have the main shaft. This was done during to turn down the arm or file it to accept the modification, to permit a more from the swash-plate to the mixing the ball securely. The photo shows rigid attachment instead of the lever on the main rotor head. This more than one ball installed so that "loose" connection, by a clamping particular cyclic control input creates you may experiment with the best action. a powerful force on the main rotor location for your own techniques and Another very unique idea from disc, and as built from the stock kit, proficiency. If you can silver-solder Kavan is the installation of a tiny brass might be a little too much for the well, you might decide to solder a universal joint between the Alouette novice. As the photo shows, this length of music wire to a very short transmission box and the tail rotor control input (movement) can be arm, and "stack" a series of balls along drive shaft. As you may already know, reduced by shortening the length of its length for a really good selection of the tail boom assembly has a slight the arm which is attached to the inner upward sweep in relation to the trans­ race of the swash-plate. The closer you positions. Or, in the alternative, a long machine screw (M2mm or 2-56) could mission box. This results in a slight can move (or relocate) the ball-link be installed and a single ball held in bend in the tail rotor shaft, with connection toward the swash-plate, place at the desired position with a attendant friction and loss of torque. the less control action will result. We By installing the universal joint, the would suggest that the ball can be small nut on either side of the ball. entire tail rotor drive system is almost installed right on the swash-plate At the other end of the push rod (on completely free of friction, and has itself, instead of having it on the arm. the main rotor head mixing lever), the reduced the tail-boom "dance" con­ Be sure to remove the arm if you do it proper "hole" selection will also siderably. Dozens of flights have this way. change the control input. In this case, produced no problems of any nature. On the other hand, I feel that it the inside hole w ill provide strong This too, is being considered as an reactions, while the outside hole will accessory for the Alouette. While tame it down somewhat. you're waiting, you might experiment by substituting a small steel spring By experimenting with these ideas, instead of the universal joint . . . it and choosing the best connection works well, but it's not as good a points, you can end up with a machine system as the universal. Again, the that flys like a pussycat, or like a tiger photos will show the details of the . . . take your pick. installation. FINAL APPROACH NEW PRODUCTS This month, we've concentrated on Now on the shelves at your dealer, the Alouette, and next month, we plan or available from Kavan, is the new to show you a much better and easier Alouette belly-pan. This new pan way of mounting the collective pitch seems to be slightly stronger and more lifting mechanism on your Jet Ranger. flexible, but the main feature is the The idea comes from a German model removal of the landing gear lugs builder who just thought it was a better (which have the habit of breaking off way of doing it.. . and he was right! on a hard landing), and the substitu­ Also in the mill, are some ideas for tion of heavy, reinforced pads to modifying the Graupner 212 to the which the landing gear struts are Heavy-duty injection molded cooling fan "Bell" stabilization system . . . three mounted with steel straps. For more shroud replaces flimsey vacuum formed unit. different ways. Until then, BCNU. · JANUARY 1978 19 Thø happy first twelve place winners at the 1977 Rough River Quarter Midget Championships. Bill Weesner (left), first place winner at Rough River, his own kit Toni, and caller Dan Kane. Too much work, you say. Well, don't do it, then. But, your competition is doing it and it's sure to add a couple of miles-per-hour to his speed. Can PYLON you afford to give him the edge? Along the same line . . . having a good prop working FOR you, instead of AGAINST you, is becoming in­ creasingly important. And having " GO FAST and _ spent countless hours working up props, we know what a royal pain it is, By JIM GAGER ana have been looking for a way to Turn Le ftf make it easier. We think we've found I PHOTOS BY AUTHOR UNLESS NOTED that way, at least for ourselves. Like all good things, it costs a little more, but we think it's worth it. We'll turn • I know, I know. There you are with away with. We personally could care the next portion of this column over to our new Prather Q-M "Little Toni" less what rules we fly under, but it's George Zink, writing in the MARA nice when you can be sure that what­ it, just waiting for the review we Newsletter: promised, to see if we ran into any ever contest you go to you'll be PROP REWORK building problems, before you start on familiar with the rules and be running "Reworking props is now a fact of life yours. Well, we're about 80% finished, competitive equipment (the reason we in QM racing (also legal, beginning Jan. lacking only the motor mount and fly under AMA rules). 1, 1978. wen). From all I hear, most QM With the increase in speeds and painting. It seems like a sure thing racers are excited at the prospects of that the article will be ready for the concurrent drop in lap times these doing their own thing with the props, and next issue, so we'll promise it for then changes are causing, it looks like they have been getting some pretty fair and keep our fingers crossed. we're going to have to clean our air­ results from their own rework. WHERE GOEST THOU, Q-M? planes up a bit more to stay compe­ "We have gone into props on a pretty We pose the question because it ap­ titive, ala Form I. That means fully fair level of effort in order to improve the pears we're rapidly moving away from cowling the engine, adding wheel breed, and without going into the ideas the original intent of this event; i.e., pants, skinny wheels, smoothly faired and engineering behind the end product, recently, in many widely geographic landing gear attachment, and a super­ we present here our procedure for com­ areas of the country, we've seen the smooth finish on the entire aircraft. ing up with a competitive blade. approved (by whom?) use of tuned 1. True the hub. pipes, the dropping of an enforced idle 2. Machine the back of the blade for rule, and even a case of running what­ the following results: ever nitro fuel you felt you could get a. Repitch the blade to a specific

"Senior Citizen" Bob Reuther, was 2nd at the Third Placer Greg Doe accepts silver tray from QM's famous B/S team, Denis Beilick (left) QM Champs, Rough River. trophy presenter Shorty Holsclaw. and Lynn Stevens.

20 MODEL BUILDER pitch and distribution to wash is taken from steps 3 to 77. The bulk of out the tip and hub surfaces. the work is all in the first 2 steps. If you b. Match the pitch distribution on would do these two steps by hand and "Profile of a Racer" in this month's text, Whit both blades. recheck frequently, you could be spend­ Stockwell, at the 1977 Riverside Nationals. c. Thin the blade. ing many hours making props and I'm George .. . not me! d. Decrease the blade chord. sure you can think of many other ways PROFILE OF A RACER: e. Sharpen the trailing edge. you would rather be spending that time. WHIT STOCKWELL f. Weight balancing by removing " That's why we are offering our We're sure that if you've been in this material from the whole length machining services to you and help with racing game for any period of time, of the blade for dynamic pur­ steps 7 and 2. Here's the deal. you've seen or heart of Whit. If you've poses. "You send me the props to be modi­ had the opportunity to fly against him, 3. Sanding the back of the blade for fied. We prefer Rev-Up 7x6 or 7x6N be­ you'll have found out just how tough finish and fine balance. cause these result in sharp trailing edges and fierce a competitor he can be. 4. Remove the existing finish from without removing the material needed for Nineteen years in modeling may not the front of the blade with 0 or 00 steel strength. I'll machine the props you send seem like a terribly long time . . . un­ wool, and balance. through step 2 and return them to you. less the modeler is 23 years old. That's 5. Reshape the airfoil at the tips with Your cost is $1.00 per prop and the cost Whit Stockwell's record; and he has 700 grit sandpaper and balance. Stop of postage both ways. Please include the the pictures to bear it out. and inspect frequently and work in name of the aircraft and the engine you The Encino, California, racer went stages. The purpose of balancing with are using. through the usual modeling stages be­ each step is to make more certain the "Right now, we are working with a 55 fore settling on R/C when he was 12. work is balanced on both blades. series prop, and it seems to work for a First came the rubber-powered 6. Fine sand with 320 or 400 grit fairly wide variety of QM aircraft and models, launched from a hill at a near­ paper and polish with 000 steel wool. engine combinations, but we will be ex­ by park by Whit and his father, Bob 7. Dip blades, one at a time, in perimenting with other props in the future (an integral part of the racing team laquer-type sanding sealer. and we will send out what we know to be known as 'Stockwell and Father' or 8. Polish with 000 or 0000 steel wool best for your particular combination. 'Stockwell and Son', depending on and repeat dipping once again. "Our fixture is capable of machining who's telling the story). Then came the 9. Polish and balance. props up to a 9 inch diameter, so that gliders, launched at the Sepulveda 10. Wax with a hard paste wax, I use Formula I props may also be machined. Basin Model Airport in the San Fernan­ Blue Coral. Our experience with these Form I props do Valley. 11. Hand-rub for glass type finish. is much more limited, but we can It was at the Basin that Whit and "If you were to go through each of machine a prop to your specifications for Bob saw their first R/C planes. A year these steps with several props, you pitch distribution. There can be no guar­ Continued on page 70 would find that comparatively little time antee that the blade will clean up or stay together even during static testing. If you want to work with us, call or write: George Zink. 80-28 222 St., Jamaica. NY 11427." There you have it. We tried some of the Rev-Ups George recommended, and also had him do some Top Flite 7x5 and 7x4-112 wide blade Super-M Power Props. With a little work to get the elliptical tip shape we wanted, and very little balancing, the props work just fine . . . you'll still have to play with them to achieve the rpm's you need but, believe me, they'll save you a lot of work. Just a cautioning note: Props are dangerous enough before you rework them, so if you redo or have someone else redo a prop for you, treat it as Could Paul Zink's QM be a Weesner "L ittle you would a loaded gun. Bob Block flew a J&M Glascraft "Miss Para­ T oni" with high aspect ratio wings? Be sure you send the props to noia" at Rough River. Placed 7th. JANUARY 1978 21 Mathes Electronic Systems' 5-channel radio has attractive brushed Transmitter components are neatly arranged in a smaller-than-usual aluminum and black-grained vinyl transmitter case. case. If reliability is based on simplicity, this is it!

transmitters ever, in a highly polished green anodized case. To keep things PRODUCTS IN USE in balance, they also put out what I consider the ugliest, the '68 and '69 MATHES ELECTRONIC SYSTEMS 5-CHANNEL RADIO. wood-grain vinyl-covered Micros. by ELOY MAREZ That company merged with Orbit Electronics in '69 or '70; Don went • For the newcomers in our hobby, tablets in the back room. I did estab­ along. He later spent a short spell I started to research just how long lish pretty definitely that Don's start with MRC, didn't seem to like New Don Mathes has been associated in R/C came at about the same time jersey too well, and came back to with the design and manufacture of as the development of the printing the West Coast. radio control systems. He needs no press. Don's present location is an ob­ introduction to old-timers and us Don Mathes and Doug Spreng scure little burg in Arizona, so ob­ "medium timers", and I found it in­ brought out the grand-daddy of digi­ scure that they have to take out ads teresting to go back and see just tal systems back in the early 60's, the asking "Where the hell is Lake Hava­ where I coula first find reference to "Digicon". Later, Don helped estab­ su City?" Well, it is somewhere in him in the model press. As it turned lish a company called "Micro- the great state of Arizona, better out, the publications I was looking Avionics", whose radios are still known for such cities as Phoenix, in got more yellow and more brittle seen on the local flying fields. Micro- Tucson, and Eloy! And Don's present as I went back in time. And I had to Avionics, before it became a part of company, Mathes Electronics Sys­ stop when I could no longer deci­ of Orbit, put out what, in my tems, is manufacturing a modern, pher the hieroglyphics on the stone opinion, was one of the best looking state-of-the-art, five-channel R/C system. TRANSMITTER At first glance, the transmitter looks quite different from what we are used to seeing. Instead of the one-piece front, top, and bottom that wrap around a one-piece back and sides, the former is inset in the latter for a shadowbox effect. The differ­ ence is largely visual, as the trans­ mitter does not feel greatly different in your hands, and in fact, because of the small size, feels quite com­ fortable. It measures 6-1/2 inches wide, 5-1/2 inches high, and a nar­ row 1-5/8 inches thick. Placement of the sticks is about optimum for my hands, which I would classify as of average size. The transmitter weight is 24-1/2 ounces. The transmitter is encased in a very attractive brushed aluminum front, and black, close-grain vinyl back case. The edges of the back piece have been finished smooth; 22 MODEL BUILDER The compact receiver utilizes two PC boards of equal size. Airborne components (clockwise from top); receiver case, battery pack, servo, and receiver components. and along with the inside, have been cadmium cells that power the trans­ Circuitwise, the transmitter does treated in what appears to be black mitter. The usual switching and not present any surprises. The usual anodizing. The Dunham open gim­ charging arrangements are used. The crystal oscillator and buffer/doubler bals and other external fittings, all only deviation from standard practice are found, driving the final, which in in black plastic, complement the is the use of a left side, sub­ this case, is three 2N5770's in paral­ brushed finish extremely well. mounted, non-removable antenna. It lel. The encoder is also standard; no The fifth channel, normally to be retracts almost completely into the IC's. It is obvious Don is not doing used for retracts, is operated by a case and does not create a problem his experimenting on us, the flyers, switch mounted on one of the upper during transporting. and is using only time-proven cir­ corners, depending on mode. cuitry, updated only by the use of So much for the outside, let's get The antenna location might be a the newest components. down to the meat of the matter. Tne factor to be considered if you fly The one departure from the norm Dunham gimbals are of the open/ with your index fingers hooked over is the use of a red LED driven by enclosed variety i.e., the pot wiper the top edge of the transmitter, such a battery condition circuit to show assembly is directly driven by the as I do. Don't ask why, except that it stick, without going through any feels comfortable. And if it is com­ when the transmitter is 'O N '' and when it needs charging. This LED is pivot or bale. But the whole gimbal fortable, it is right. But in this man­ submounted in a plastic well, located is enclosed, thereby not leaving the ner, your finger can touch the an­ in the position usually occupied by transmitter insides open to the ele­ tenna, causing detuning and ob­ the normal meter. In use, throwing ments. The integral mechanical trims viously some loss of signal. During the switch to “ O N " causes the LED are part of the gimbals, and are the considerable flying that I have to glow, which is easily seen down located under and to the inside of done with this system, I have caught in its recess even on a sunlit day. the sticks, as is common practice. myself touching the antenna, with no ill effects at the receiving end. I'm When the battery reaches the critical The electronics are all on one retraining myself though; this could 1.1 volt per cell level, the LED printed circuit board, with the ex­ cause a problem on a long low ap­ starts to blink, indicating a need to ception of a transmitter battery con­ proach or as you go round Number recharge. The instructions are to the dition circuit, which will be One pylon during a race. described later. This main PC board Continued on page 72 is located on top of the base- mounted plastic battery case which holds the eight 500 MAH nickel

Three servos in mounting tray . . . a small, Model Builder uses this arrangement to check servo performance. Very simple and effective. easily installed package.

JANUARY 1978 23 Fred Emmett shows his well-built Riser Rider. Hit a car at the Bruce McAvinew applies modern technique for starting the ignition Fresno Annual. converted engine in his GHQ Sportster. Fine aircraft for R/C. like a rocket, with excellent atten­ dance, considering the newness of radio controlled old-time free flight on the West Coast. Trophies and prizes were promoted by Red Bar- ÍPIU6SPARKS rows, while the PR work was done by Al Heilman. Of course, Tom Bris­ By JOHN POND tol and John LeSeur did their usual outstanding work. Only one fly in the ointment, they called the meet the • Well, SAM 21 and SAM 26 did “ Pond Memorial.'' The columnist is the Pond Commemorative up brown still getting calls asking when he this year! All due credit for running died, hence, the contest being re­ an excellent meet should go to John named Commemorative. LeSeur, Contest Director (SAM 26), Lessons learned from the first two Tom Bristol, Assistant Contest Direc­ meets were: (1) too many events on tor (SAM 21), and the Tri-Valley R/C one day, (2) with any sort of bad Modelers. A beautifully run meet to weather, there would not be enough say the least! time for flying and, (3) one day was For those not fam iliar with the not enough to attend to all the many Pond Commemorative, this came functions of a contest. about as an idea of Red Barrows, of This year, a two day affair was San Diego. Red's idea was to have staged, with the Commemorative an old-timer contest where the old Banquet being held on Saturday man would have absolutely nothing night. This year's banquet was no to do. The idea here was to have exception, as it proved to be very Pond possibly win with no excuses popular. For those who had not pre­ of administrative work interferring registered or reserved a table, things with his flying (it hasn't helped were a little tight, as over 100 had much, haw!). already signed up. With help from Al Heilman and The girls get into the fun. Neva Nicholau and The banquet featured Dr. John John LeSeur, the initial meet got off Miriam Schmidt with Nicholau's Super Buc. Nicolaides, formerly of Notre Dame,

Ted Kafer, Sam 21 newsletter editor, enjoys some help from Prexy Bob Sliff's fleet of Playboys won Class A, B, and C at the Pond Don Bekins. Ship is JASCO Flamingo. Commemorative, Santa Maria, California.

24 MODEL BUILDER Fawncy cowl on an unidentified Sailplane, seen at the Fresno The better half of the Bernhardt family. Marge, with brand new Annual. rebuilt Trenton Terror. Fresno Annual. and now head of the Aeronautical wind. The next day, he took two ment was generated on Sunday as Department at Cal Poly. His talk on fourths, in Texaco and .020 Events, the columnist's model, and quite a the development of RPV vehicles both fuel allotment type of contests. few others, were constantly playing and other aeronautical oddities (such Needless to say, Bob won the hide-and-seek in the scattered as his "Flying Mattress"), was the Sweepstakes trophy by a wide clouds. At one point, the writer hit of the nignt. For a change, the margin over runner-up SAM 21 never saw the model for two min­ women, who are generally bored to Prexy, Don Bekins. utes, having to rely on the timer and tears at these functions, found the A considerable amount of excite­ others for flight directions. Well, you good doctor most entertaining and amusing with his humor and dry wit. Slides and films on parafoils were shown, depicting John LeSeur taking an active part as the RPV pilot. Matter of fact, John has gotten such a reputation as a RPV pilot, he is seriously considering the sale of his excellent hobby shop in Santa Maria. Wanna buy a hobby shop? (Nicolaides was the "star" on a recent showing of "60 Minutes", demonstrating his parafoil, wen) Originally scheduled in December for the first contest, the Commemora­ tive has been steadily moved for­ ward a month each year. The first year featured frost in the morning. The second, in November, was still chilly, with very scattered lift. The third, staged in October, proved to be good, but suffered from early morning fog. In most cases, the fog did not lift until 10:00, which was followed almost immediately by the wind. By 2:00 each day, all flying was generally suspended. Seems as though there is something wrong with each month for flying! Regard­ less, John LeSeur announced that next year's Pond Commemorative would be held on October 14 and 15. So paste that one in your hat! What can you say about the flying when the results show Bob Sliff placing in every event (five) over the two-day stint of flying. To show that he wasn't fooling last year, Sliff won every event on Saturday. His fleet of scaled Playboys won Class A, B, and C. To show it was no fluke, he was actually ''maxing'' in the afternoon

JANUARY 1978 25 The Florida Turkey Flyers (I to r): Terry Rimert (Playboy), Howard Hemminger (Bombshell), Helmer Johnson's Playboy floats in after a Bryton Barron (Playboy), and Frank Carney (Playboy). Nice looking flying field. flight in Houston. Texas.

Mimi Gerard holds John Pond's latest electric Bob (EK Products) Elliott's Powerhouse reaches for the sky in Houston. Texas. This and above powered 1936 Turner Special. Sanwa 3-channel. photo of Johnson's Playboy sent to us by Owen Morris, NASA Space Center, Houston. know, as you get older, people talk one for a great meet. No question clone, and Ohlsson. A definite over­ softer, your arms get shorter, etc., etc. about it, next year's Commemorative haul was in order for the present line The new proposed club, SAM 49, will be bigger and bigger! of OK engines, and Charles Brebeck spearheaded by Otto Bernhardt and ENGINE OF THE MONTH proved his ingenuity as a machine Al Heilman, claimed the majority of A lot of old-time modelers never man. the prizes, led by Bob Sliff, taking realized that there was such an In 1940, Brebeck came out with a six of the fifteen trophies, and leaving engine as the OK 49. This motor, new look on his engines, while keep­ the balance of the hardware for SAM due to its slightly lower power out­ ing most of the basic parts un­ 21, SAM 27, and SAM 26. Worst put, was responsible for a consider­ changed. He announced an OK part about it all is that SAM 49 is able number of designs in the five Deluxe (.616 cu. in. displacement), not yet formally organized! foot wingspan size appearing in the OK Standard (.604 cu. in.), the OK To wrap up a real fine time by 1941 model magazines. Special (also .604), and the OK 49 all, the old man was requested to To back up a little, the gas engine (.493 displacement). There was a award the trophies. This gave the craze was in full swing by 1939, and price for every pocketbook, with the columnist an excellent opportunity to there was plenty of competition for Deluxe starting at $19.50 (strangely thoroughly express thanks to every­ the market from Brown, Super Cy­ Continued on page 75

Another Flying Aces design built by Phil McCary. Remember the Keep your eye in the sky, even for slow-flying old-timers. This Dal- "Stall-Proof Gassie"? laire belonging to Hal Cullens, Yuba City, punched hole in hood.

26 MODEL BUILDER PHOTOS BY AUTHOR // i ! in J.C. YATES MADMAN .02 0 R /C By FLOYD CARTER . . . Control Line, Radio Control, and Old Timer, all rolled into one! Most famous of the early post-war C/L Stunters was this design by "J.C." Yates . . both a legend in their time. • The peacetime economy of 1946 of the time. On the other hand, it that the Madman was indeed a brought a sudden increase in the avail­ seemed almost too small to be com­ capable machine. This performance ability of consumer goods, after a petitive with the big, lightly-loaded was not lost on the competition. The decade of economic depression, planes that were popular. Madman kit was soon introduced and which was followed by another four The designer of this new model was became the standard stunt machine years of severe rationing and wartime a young man named J.C. Yates. And for serious contest flying. It wasn't priorities. Many small companies he quietly began to show the rest of long after this that glo plug engines found their government contracts us what a winning combination could were introduced. These permitted ended, so they were eager to switch do. When the smoke finally cleared, smaller, lighter planes with wing flaps. their production lines from military he had earned 37 trophies to prove The Orwick engine faded from the hardware to candy bars, washing machines, and model supplies. En­ gines, balsa wood, and other materials once again appeared on the shelves of hobby shops. Former modelers found their way back into the hobby, along with countless others whose aviation interests were triggered by the recent air warfare. Control line flying had been intro­ duced only shortly before the war, and little development had since taken place. Without much of a background for guidance, modelers invented, developed and refined the control line stunt pattern while striving to design the optimum stunt machine. Planes of all shapes and sizes appeared at flying fields and in kits, only to be­ come obsolete and outclassed within a very short time. Along with the mainstream of de­ sign philosophy which gradually took shape, my own models of the time imitated the large "barn door" de­ signs powered by the magnificent new Orwick 64 engines. Size and lots of wing area were considered necessary to carry the heavy engine and its ignition system. In the midst of this trend, one can imagine the skepticism that greeted the Madman. Here was a very hand­ some model which resembled, but did Miss Allison Carter shows off the classic lines of the "Madman". While the .049 TD is tiny in not imitate, the sleek fighter planes comparison with the original Orwick, the 1/2A model has adequate power. JANUARY 1978 27 28 FULL SIZE PLANS AVAILABLE - SEE PAGE 112 MODEL BUILDER The original "Madman", built by J.C. Yates. Wheel pants were later discarded. Note the heavy ignition wire to the spark plug. stunt scene, and the Madman became another casualty of progress. During his practice sessions with the Madman, J.C. (yes, that is his full, given name) developed what became known as the "Yates Takeoff". With full up elevator at takeoff, the Mad­ man could roll a few inches and then half-loop to inverted flight. Modern control line combat machines will do this, but J.C. was the first to do it (but not in contests). That kind of flying was possible because of the brute power of that big Orwick, which would swing a 12-6 prop without any thought of slowing down, regardless of the attitude of the airplane. That kind of flying also earned J.C. the The control line lead-out wires are fake (but nickname "Madman Yates", which scale!). Antenna wire is clue to R/C. was coined by Johnny Davis in the the nature of a classic design. It model press. never seems to look dated or out of After his Nats win in 1948, J.C. place. retired from control line stunt compe­ To get the Madman down to 1/2A tition. He is now an R/C enthusiast size, it was necessary to reduce the and regularly flies at his home field plans only 18%. The same basic in Southern California. J.C. still has a method of construction is retained, but Madman or two that he takes out occa­ the fuselage had to be widened a bit This simple wing-jig is worth the effort to sionally to brush up on his U/C pat­ to make room for the 2-channel radio assure building a straight wing. tern technique. Except for the wires (The original model had a straight attached to the wing, it could easily taper from the firewall to the tail post.). pass muster side by side with modern If you use one of the small radios now R/C models on the flight line. Such is Continued on paqe 79

The 1/2A R/C "Madman" ready for covering. Conventional structure is very clean. Note Equipment installation arrangement. Battery leather pattern-maker's fille t between wing and fuselage. pack is below 2 oz. fuel tank. JANUARY 1978 29 the plan sheet; there is no separate instruction sheet to get lost or chewed PRODUCTS IN USE up by the dog, or whatever. The in­ structions are very complete, even to CRAFT-AIR'S R/C BUHL "BULL PUP", by PHIL BERNHARDT the point of specifying the proper type of glue to use for each step. The choice of glues is not really all that critical, • Craft-Air has made quite a name for fuselage and unusual mid-wing con­ except when something is to be glued itself over the past few years, by offer­ figuration, so it wasn't hard to accept to the plastic fuselage shells. A buty­ ing kits for some of the best competi­ the offer to do a review on the kit. rate-based cement (I used Ambroid) tion R/C gliders you can buy. Co to The full-size Bull Pup was one of the must be used for this, as nothing else any glider contest and there will al­ first lightplanes to use a metal mono- will stick to the plastic. The kit in­ ways be a handful of Windrifters on coque fuselage. To get the same ap­ cludes all of the hinges, horns, and hand. Always striving for better per­ pearance, the Craft-Air kit uses two other small hardware needed to build formance, Craft-Air's latest kit is the vacuum-molded ASA plastic fuselage the model. Black elastic thread for great big super-thermalling . . . hey, shells, supported by a simple internal the simulated rigging is included, even wait a minute! This one'sgaspowered! wooden structure. The shells even a nylon tailwheel. The landing gear is That's right. Craft-Air's newest kit is have little bumps molded in to simu­ pre-bent from hard aluminum sheet a 42-inch span, stand-off scale model late rivets. Needless to say, this type and comes in two halves, which can of the Buhl "Bull Pup", for .09 to of construction is a heck of a lot be removed from the fuselage if neces­ .15 size engines. In case you've never easier and quicker than building, let's sary. The landing gear is the only heard of it, the Bull Pup, built by Buhl say, a balsa fuselage, because all of major deviation from scale on the Aircraft of Marysville, Michigan, is a the nice compound curves of the Bull whole model. The full-size airplane 1931 ultra-light that was aimed at the Pup's fuselage are already done for used a type of tripod arrangement deflated pocketbooks caused by the you. for each wheel. This kind of set-up Depression. It never really did catch The kit incorporates all of Craft- would make the model look better, but on, and was in production for only Air's usual high quality. The wing ribs wouldn't be nearly as rugged as the one year, so that today, only eleven and spar webs are all pre-cut and gear supplied in the kit. or so are active. The Bull Pup has sanded, and the fuselage formers are The Bull Pup's construction is so always been one of my favorite die-cut from plywood. The building simple that little needs to be said vintage aircraft, with its potbellied instructions are printed at the top of about it here. The wing uses conven­ tional open-bay construction (no sheeting except at the center section) and features top and bottom spruce spars with shear webs in between, just like most modern R/C gliders. In order to save weight, the tail surfaces are built from balsa sticks instead of the more typical solid balsa sheet. The horizontal stabilizer is a little unusual in that the elevators are not full-span, but end a couple inches short of the tips. This is to decrease the eleva­ tors' effectiveness, as the prototype models, with full-span elevators, were quite touchy in pitch. All that's needed to build the fuse­ lage is to glue a few plywood formers and a spruce-and-plywood crutch into Top of fuselage, from headrest forward, is attached to wing. Single bolt, below tri-pod strut, the plastic shells, and then the two holds assembly onto fuselage, keyed with dowel. "Flying wires" are elastic thread. shells are glued together. It sounds 30 MODEL BUILDER simple, and it is. Be extra careful, however, when installing the crutch; the wing and stabilizer both rest on top of it, so make sure it doesn't get twisted when gluing it in place. I suggest tack-gluing two balsa sticks vertically to the nose and tail of the crutch; this way, any twisting that might creep in while gluing the crutch into the fuselage can be easily seen by sighting along the two sticks. The airplane itself is not very big, but there is enough room in that deep fuselage for just about any currently made radio. My Kraft "brick” and KPS-11 servo fit in there nicely, and with lots of empty space under them, Only obvious deviation from scale is the sheet aluminum landing gear struts, replacing the 3- where the receiver of the more typical strut scale gear which would be rather tender for every-day sport flying. individual servo system might go. The brick and servo wouldn't fit the rather closely spaced spruce servo mounting rails in tne kit, so I made a plywood mounting tray that is supported on both ends by the F3 and F4 fuselage formers. That big old KPS-11 servo pushes the brick to the very back of the radio compartment, which is the absolute worst place from a CG stand­ point. In order to offset the weight of the heavy radio, I decided to use a lightweight battery pack . . . No dice . . . The airplane wouldn't even start to balance with a 250 MAH pack, and just barely makes it with a 500. All this adds up to a pretty heavy radio Loaded down with a Kraft brick plus a KPS-11 servo and 500 MAH battery pack, the Pup still for this little ship, and the fact that it flew well. Most radio installations would be smaller and lighter. still delivers excellent performance is a credit to its design. results with it, but right there in the be completely compatible with the instructions, in capital letters, it said ASA plastic. The only gripe I have is The most colorful Bull Pup I know "EPOXY PAINT IS NOT RECOM­ that it's so hard to find; none of the of is based at Santa Paula, California, MENDED." It turns out that something local hobby shops had it (they told me and belongs to Clete Roberts, the well- in the paint has an effect on the ASA they couldn't get it either). I finally known TV newscaster. His airplane is plastic, making it brittle. Pactra's new tracked the paint down at a not-so- done up in the blue-and-yellow colors polyurethane paint looked like a good local hobby shop and had to drive of the primary trainers of early WW II, alternative, and in any other case it into the next county to get it. and since I've never had a model with would have been okay, but I needed this color scheme I decided to copy it. The building instructions end with a a particular shade of blue and the list of things to check before making The wings and tail surfaces were Pactra paint was either too light or covered with Monokote, then trimmed the first flight. One of those items is too dark. To make a long story short, "balance as shown on the plans". The with both Monokote and Trim Mono- I ended up using R&S Products' "Per­ kote. I had originally intended to only problem here is that the balance fect Paint". This stuff is every bit as point is not shown .. . not on the plan paint the fuselage with K&B Super- fuelproof as epoxy paint, and seems to poxy, because I've always had good Continued on page 82

An OS 10 R/C engine is more than adequate power for the Pup, even Fuselage is molded in two half-shells, of tough ASA plastic. Be sure with the heavy radio load as used in the test. to avoid certain paints, as specified, that can make the plastic brittle.

JANUARY 1978 31 mount in the event the bolts are not properly tightened and/or come loose. This is a good safety feature, and one PRODUCTS IN USE we were glad to see. A tank and throttle are part of the MRC/IM ENGINE TEST BENCH STAND, by ELOY MAREZ assembly. The former has a capacity of 1000cc (33-plus ounces), so you don't have to fool with filling a smaller one • Have you ever noticed how many the answer, in their Engine Test Bench all the time. It is held in place on of the answers on “ Advice to the Stand. formed, foam padded clips, to which I Engine Owner" in the model press This one has it all, starting with the added some rubber bands in case the wind up saying: "Sounds like you construction material itself, which is slipstream gets a bit much for it. The haven't run it enough to be familiar all heavy (.080 inch thick) steel throttle is another handy feature, with it", or, "Maybe it isn't quite yet angle and formed sheet. Heavy having a friction device that you can broken in?" enough to take the stresses for which adjust to keep things running at the Well, to do any of these things, the stand is intended, and heavy desired speed. you've got to bolt your engine down enough to provide some of the pounds Since the throttle-to-carburetor arm someplace, feed it some fire and fuel, necessary to anchor down all those distance will vary from engine to and run it according to its manufac­ horses. All the material, including nuts engine, I looked for an easy way to turer's instructions. We all have our and bolts, is finished in a corrosion- vary the length of the linkage. The pet way of doing this. It may be one of resistant finish to withstand rust and solution was easy; requiring only the the wooden or cast metal stands the ill effects of too much nitro. installation of a Du-Bro E-Z connector available, which don't look quite safe The engine-holding clamps them­ at the throttle. By simply loosening a for the .60's and even some of the selves, adjustable in spacing for model set-screw, the length of the wire going ,40's. It may be a piece of wood with a engines from .09 on up to the one-plus to the carburetor arm can be adjusted "U " cutout of one end. Or it may even cubic inch biggies, are formed from as required. be your one and only airplane, which .177 inch steel, and have a cross-hatch Assembly is fast and simple. The some guys will use as an engine test pattern stamped onto the areas be­ only tools required are two 10mm box stand. No doubt this sort of thing will tween which the engine mounting or open-end wrenches, or in the go on as long as there are modelers, lugs are held. This gives them more absence of these, a couple of good but for those of you who care to do it 'bite' than would smooth surfaces. metric Crescent wrenches will do the right, Model Rectifier Corporation has There is a third piece, with a formed job. The instructions are short, but the answer. Actually, MRC, importer, overhang, that prevents the engine complete. I have only one suggestion: and IM Products, manufacturer, have from going forward and out of the Lock-Tite. Over a period of time, this

Adjustable, but sturdy mounts, will take a wide variety of engines A simple plywood plate mount, w ith notch for engine, adapts stand which are firm ly clamped into place for running. for even the smallest glow and diesel buzzers. Make this yourself.

32 MODEL BUILDER To prevent the engine from sucking in surface dirt, and to avoid kneeling for grandfathers and other types of "old men , we suggest this storage box/stand seen in photo at left, and sketched below. To the right, the author's Black Head Webra with Zinger prop, ready for a long run-in. stand will get quite a bit of stress and And unless you are fortunate the opening in the top for inserting the vibration, and you know how fast an enough to have a soundproof venti­ stand. The stand is longer than it is engine will tear itself away from the lated room in which to do your engine wide, and will fit into an 11 by 14 inch mounts once the first screw gets loose. running, or are far enough from the opening. Therefore, I started with a The same thing can be expected to neighbors to permanently mount it box with 14-1/4 inch square inside happen to this type of assembly. Lock- above ground someplace, you are dimensions, and added 1-1/2 inch Tite on all the bolts, at the point where faced with the problem of transporting cross pieces at the front and rear. The the nut makes tight contact, w ill it to wherever you can do your engine Engine Stand will sit on these cross prevent future loosening. running. pieces, and is attached to them with It is possible to assemble the legs so After kicking this around, I decided No. 10 machine screws. Upon being as to be out-of-square with the top. To that simply putting it on a base was not removed, and rotated 90 degrees, the prevent this, snug down all the bolts, the answer, as then it would be high stand will drop down into the box. and then sight down along the front and awkward to transport. Therefore, I The height of this stand is 14 inches; and rear edges, towards the angle settled on a combination carrier and mounting piece along the bottom. I would recommend a minimum often base, which stores the Test Stand on its as enough for a total height to clear all Adjust the latter 'til it appears perfectly way to the running area, and supports lined up with the top, tighten all bolts, but the dustiest terrain. Higher than it above ground once there. that is better if you have slow starting and it's done. It is a simple box built of 5/8 The fittings on the top are put on in engines and don't care to bend over plywood, glue, and screws. The only too much. much the same manner, except that critical dimensions are the height, and you will need 5 and 7mm wrenches, Continued on page 81 and a medium sized screwdriver. NO. 10 SCREW HOLES Don't forget that some of these screws 1-1/2" WIDE are permanent, and can use Lock-Tite, while others are not, and should not. Since I also run and fly the smaller engines, I resorted to the "piece of wood with a 'U' cut out of one end" as adaptors to hold them. As shown in the photos, a Cox .049 with tank is mounted on a piece of plywood, which in turn is held in the Test Stand as though it were engine lugs. The whole idea was to keep from having two engine test set-ups. Now that we have it all together, we are ready to go run an engine, right? WRONG! As it is, the Test Stand is much too low to the ground to set someplace other than on perfectly clean concrete, and fire up. To do so w ill stir up all kinds of unwanted engine-eating debris that will wind up inside your $100 beauty or get thrown into your face at the prop. Though it isn't specifically stated, this stand must be designed for mounting on top of h - r - H something else, as three holes are -* ------10" — »-J provided in each horizontal base piece. ^ ------14-1/4- INSIDE

JANUARY 1978 33 you can taper the stuff to a razor-sharp can catch and hold a parachute so airfoil, and it'll even stay that way. strongly that the engine will pop out Note that the fins are set one body the back. Method No. 2 involves tying diameter ahead of the tail end of the a tiny knot in one end of a length of tube. Believe it or not, this helps. strong thread and gluing it along the Good ΟΓ CMR Egg Capsule (regis­ fin-body joint of one of tne fins. Once tered trademark) is employed to hide covered with a fillet or two of five- the egg. CMR Capsules come with a minute epoxy, this forms an extremely lanyard that is threaded through the strong mounting point for the recovery base and knotted, to provide a place gear, with the blessed advantage that for the shock cord and parachute the inside of the tube is clear of any attachment. The interior recovery and all hindrances to chute ejection. tackle is an important consideration in The advantage over Method No. 1 is the avoidance of messy recoveries, that the heat of the seventeenth and so deserves careful attention. Two ejection charge won't burn through a alternate systems are, in my experi­ string on the outside of the model. ence, the best. The first is to tie a strong line around the engine block before Our second record-setter, courtesy you glue it in, and attach shock cord, of the Southern-Fried Mr. Lee, is the recovery device, et al, to this. This Shotgun Rebel, so-called "because of hookup eliminates the blasted shock its double-barrelled pod." Apparently, cord mount that one usually glues to Terry got the idea during a local the inside surface of the tube, which "revenooer" hunt. Terry, never one to

MODEL ROCKETRY By DOUGLAS PRATT . .•

• (Caution. The following article has been written by a man suffering from a serious addiction to rocketry. He has also been known to indulge in heavy doses of Star Wars, followed by old Ernie Kovacs television shows. Ex­ treme skepticism is advised.) In case you're wondering, that's so the Food and Drug Administration can't claim that I cause cancer in monthly doses. Greetings across your horn-rimmed spectacles. This month we offer news from the peculiar world of rocketry, and two (count 'em) plans from Terry Lee, Southern gentleman and deadly competitor. The first of said plans is the Sprint D- 5 egglofter, which holds the current Pigeon (D engine) USA single Eggloft record. The record flight of 621 meters was made at NARAM-18, August 3, 1976, usinga D6.1-6 engine manufac­ tured by AVI. Note that tne model was launched from a tower, meaning that no launch lugs are necessary. If you don't have a tower, the "POP" launch lug from Competition Model Rockets is just as good. Main airframe is Estes BT-20; Cen- turi ST-7 is the same size, and CMR sells a tube that has a slight structural superiority (because it's stronger). Fins are from the Estes Sprint kit, made from The "Shotgun Rebel" with wing slid back against the stab and outer panels folded, all ready 3/32 balsa. Thin ply is also excellent; for rocket launch. After 5-second power boost, ejection charge releases wing for glide phase. 34 MODEL BUILDER WINGS - 20"x 3"x 3/16" PRE AIRFOILED HARD BALSA STAB & RUDDER - 1/8" BALSA BOX - 1/16" PLY. ENGINE TUBES - 5 " CENTURI no. 8 BOOM - 18..X 1/4” x 3/8" SPRUCE HOOKS & WING HOLDDOWN - PIANO WIRE WING HINGE MATERIAL - ADHESIVE BACKED CROME MYLAR

DURING BOOST. WINGS ARE FOLDED DOWN & HELD NEXT TO THE STAB BY NYLON STRING RUN THROUGH THE HOLES IN THE BODY TUBES. AT EJECTION. THE STRING BURNS. ALLOWING THE WING TO BE BROUGHT FORWARD BY A RUBBER BAND. THE WINGS ARE THEN PULLED OPEN BY RUBBER BANDS. SHOTGUN REBEL

U.S. CONDOR R.G. RECORD HOLDER EMTY WT. 59g TIME: 188 SECONDS LAUNCH WT. 145g VACUUM I - MAY 23, 1976 - BRISTOW. VA. GLIDE WT. 104ς BY: TERRY LEE - NAR 9020 WING AREA 54 « · POWER: TWIN FSI E5«

waste a newton-second, flew and lost barrel Shotgun (shudder!). of silence for sputtering and fuming. four of these little gems with twin FSI Terry sends word that MARS XII was The latest issue of the Model Rock­ E5-2 engines before getting one back postponed for lack of insurance. I eteer, which is back in the capable (good old Return Rule!) and filing for spoke to this point last issue, and here (understatement) hands of C. Ffarry his record. The Shotgun Rebel is a is more sad evidence. MARS, held for Stine, reports that insurance will soon good example of the Flip-Flap-Klunk- the last twelve years at the same site, be available to sections, and that there Sproing school of glider design; it is has, of course, never had an accident, is a good chance that next year's AMA technically known as a Sliding Flop- yet the site owners insist on insurance. policy can include a NAR rider. Pray Wing (no kidding). The wings hinge Sure looks good, doesn't it, when you for us all. It cost us $200 to insure back during boost to reduce the lose an insurance policy for no good NARAM-19, which contributed hand­ chance of shredding, and the entire reason? We will now have a moment ily to the meet going into the red. wing surface slides along the square boom on a plywood box built around the boom. At launch (see pic) the wings are back against the stab, and the outer panels are restrained by the wire hold-downs attached to the stab. The wing assembly is held in position with a loop of nylon string, which feeds through those holes in front of the engines. The E5's thrust for five seconds, and this bird has a reputation for a good, straight boost. At ejection, the ejection charges burn through the nylon thread, the wing slides forward against a stop, the panels hinge outward, and Nature takes its course. The glider is based around a Thermic B kit. Terry suggests using loops of piano wire to attach the bands to the wing panels. Adhesive mylar is dandy for the wing hinges, and Super Monokote works well, too. Terry notes that the FSI E5 engines have been officially re-rated as D engines, which With wing panels unfolded and in glide position, the Shotgun Rebel looks more like a glider, opens up the possibility of a triple­ though somewhat lumpy. Best official flight is 3 minutes, 8 seconds . . so it does work.

JANUARY 1978 35 Oh, yeah. Addresses of manufac­ turers mentioned in Terry's plans are: Centuri Engineering, P.O. Box 1988, Phoenix, AZ 85001. Competition Model Rockets, Box 7022, Alexandria, VA 22307. Estes Industries, Penrose, CO 81240. Flight Systems, Inc., 9300 E. 68, Raytown, MO 64133. AVI Astroport, Mineral Point, W! 53565. Not really a manufacturer, but send money to them anyway: NAR HQ, Box 725, New Providence, NJ 07974. Lessee, what else is new? Centuri's new catalog is out, mailed wrapped in a copy of the "Rocket Times." The centerspread is Star Wars pix with appropriate captions (Han Solo at the controls of the Millennium Falcon: "Where is that safety key??"). Also highlighted is their new Club Assort­ ment Programs, calculated to save mucho dinero for educational groups who need a kit for each student and want to buy in bulk. In the RT tradition, there are plugs for NAR activities, and even a reiteration of the NAR discount on Model Builder subscriptions (thanks, guys). Of note is the slicked- up-and-expanded Centuri Aerospace Team, with pictures of some of the The Sprint D-5 pigeon egglofter, by Terry Lee. members in compromising positions See text for more construction information. (Alan Williams weighing-in a contest Wars products. The only one I have model, for example). And over to one definite word on is a Starter Kit, to be side there are a couple of pictures and out for Christmas giving. There are a description of the Cruise Missile. rumblings of scale X-Wing and Tie You wouldn't be thinking of releasing Fighter kits. Hot damn. I guess this is a kit of that little beauty, would you, what comes of the fact that Dane guys? Wouldn't a series of air-to-air Boles, Estes VP, was christened "R2- scale birds a la your Fighter Fleet be D12" at NARAM. Chirp, tweet. lovely? Hint, hint? In the future, I'll be running some­ Estes, lord and master of most of the thing interesting. In view of the prolif­ market, is pounding out some Star eration of microcomputers in the U.S., SPRINT D-5 . . National Record Holder it seems about high time that someone Pigeon Eggloft. . 621 meters, NARAM- worked out ways of using computers 18, August 3,1976, Allentown College, to do things with model rockets. The Center Valley, Pa. work has been done, mostly by Power: AVI D6.1-6.75 Tower Launched spacemodelers who had access to Parts: 12" BT-20 Estes, three 3/32" sprint fins Estes No. 32224, Egg Capsule CMR ENC- college computers during their ivy- 77 with RB-74 shoulder. covered sojourns. I was one of them, Set fins one caliber ahead of rear of body tube. and I'm searching for the FORTRAN Add fillets of 5-minute epoxy. programs that I had worked out for Empty Wt: (No engine or egg) - 27.5 gr. Launch Wt: 125.7 gr. things like estimating altitude, optim­ izing design, and calculating center of pressure. Some rather classical work was done by Charlie Andres at Cornell, and I'm trying to get copies of that too. The next step is to convert the FORTRAN into BASIC, which is by far the most widely-used microcomputer language. This shouldn't take too long, since I just bought a microcomputer (subtle brag). So start making friends with someone who owns a micro, and if you have or hear of any model- related computer work, please let me know. For now, I have to get back to my usual activities, which include slitting shock cords and flattening out Braille. ·

3 6 MODEL BUILDER ■r*-.

t i A stock 2T-1A Trainer with low pressure tires and wheels. Most Great Lakes were powered by one of three versions of the American Cirrus engine, 90 to 100 hp. Exhausts on this airplane were flexible tubing, bent and flattened at the ends. Photo from John Underwood collection. Great Lakes Trainer 2T-1A

By PETER WESTBURG PART TWO • The Great Lakes Trainer shown in the plans was originally purchased by Right side view of above ship. Great Lakes was compact aircraft, with no wasted space in the Cedric Galloway in 1934 (see his C.G. fuselage. Handgrip under tail was a formed cup around the longeron. Underwood photo.

NC818K at the 1932 National Air Races. Racing mods included long windshield, covered front cockpit, and wheel pants. Many companies located on the Delaware-Maryland-Virginia penninsula used Del-Mar-Va name. Wonder where this one was located? UNDERWOOD PHOTO

JANUARY 1978 37 ‘

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G> 00 MODEL BUILDER Enterprises ad in the last issue, wen); he put 150 hours on it and earned his Limited Commercial license before selling it to Clem Wittenbeck, April 25, 1936. While owned by Calloway, NC-856K was finished in cream and international orange, but Wittenbeck finished it in black and white and flew it in many airshows, doing inverted passes over the field and outside loops. Space does not permit listing all the achievements of the Trainer. In August of'1929, Tex Rankin flew a Great Lakes with an extra fuel tank in the front cockpit, 1350 miles nonstop from Vancouver, Canada, to Agua Caliente, Mexico, on 75 gallons of gas ($22.50 worth in those days) in 13 hours and 7 minutes. In the same airplane, he established a record of 19 Great Lakes designer, Charlie Meyers, with inverted Cirrus powered 2T-1E. Placed 3rd in 1930 consecutive outside loops. Several Cirrus Derby. Stock single seaters had no upper wing center section cut-out at trailing edge. other records were set or broken in 1929 and during the following two years, but the clutching hand of the Great Depression caught GLAC up in its grip, and though the price of the airplane was cut several times to a low of $2985 in 1931, the market for the marvelous little biplane disappeared. The company finally succumbed in 1936 after manufacturing approxi­ mately 450 units. Some of tne Trainers are still around, having been lovingly restored by aerobuffs; but even more remarkably, there is a factory in Wichita, Kansas, devoted to keeping the memory of the airplane alive. The new Great Lakes Trainer is now powered by the ubiquitous Lycoming opposed engine. The price? Approxi­ mately ten times the original cost! · "Cowboy aviator" Roman Warren entering front cockpit . Cowling between pits was hinged tor easier access. Photo taken at Riverside Airport, near what is now Flabob Airport, California.

This GLT was equipped with navigation lights. NC848K was 110th aircraft built. Note the Szekely powered Buhl "B ull Pup" in the background. Also not the jodhpurs and boots-clad figure under the GLT's nose. This was the typical "daring young aviator" togs of the day.

JANUARY 1978 39 Phil Kraft and a helper bring a wingtip of the Fournier into position. Fournier powered glider belonging to Phil Kraft. Note single main Note shaded portion of canopy. wheel and stabilizing wheel and strut near fold in wing.

by Dr. LARRY FOGEL. R c SOARING PHOTOS BY AUTHOR • Hopefully, we learn from our mis­ launch . . . just to make sure that scending. It impacted the ground in takes .. . and sometimes even from everything's turned on and operating. level attitude . . . and without a scratch. those of others. Let me confess. I was I did just that, and it was. So I threw What luck! I should have gone to about to launch my Raven off the cliff the craft out in level flight . . . only Vegas instead of the cliff. From now at Torrey Pines. . . You know, that fine to realize that I had no control. on I label each bird with the fre­ thermal flying wing designed by Dave Then it dawned on me. I had quency it contains. Do you? )ones, of Los Angeles. changed the airborne pack from Let me reflect on other things that Long ago I learned the good habit violet-and-white to brown-and-white. might avoid trouble for the newcomer of moving the control stick before With the transmitter so close to the to our sport. It's well to use an ex­ receiver, you have apparent positive panded scale voltmeter to check the control, but a few feet out you have charge level of your airborne pack . . . nothing. before you fly. If you don't have one I quickly shouted for any brown- available, at least watch for any and-white transmitter, but none was sluggish control response or a change available. I watched helplessly as the of trim which might testify to your sailplane porpoised in fitful loops, due need for recharge (or replacement of to the last "u p " instruction it had re­ those dry cells). ceived at the launch. That was a lucky If you find that you're flying with break. Most of the time, the Raven increasing trim away from neutral, you was flying near to level flight. As the might also check your hinges. They attitude became severe, it would flip could be slipping out a bit. This can or sharply drop its nose, then quickly introduce a significant bias in the pull out. The rudder was in neutral control surface, and thus the need and so the plane performed this dance for trim compensation. Jay Horowitz and Larry Fogel (in shirt) soar while the wind pressed it back toward You may experience jitter in the in desert thermals near Palm Springs, from hi- start launch. Sure looks like hard work! me. Soon it was overhead and de­ servos when operating near neutral

View of løft wing of Fournier from rear cockpit, at 3,000 feet. Instrument panel of Fournier powered glider, for the benefit of Sure hope that pin is locked! scale nuts.

40 MODEL BUILDER The inboard releasable tow hook, by Rocket The author's Raven, 300 feet over the Pacific, at Torrey Pines. City Industries.

Lloyd Standley and his Beaver, built from Can you imagine a mouse controlling a beaver? The Beaver performs some aerobatics for spec­ Pilot kit. The cockpit of Standley's glider. tators in a boat off Torrey Pines, California. position. That may be a sign of dirty usual landing circles. pots or excessive wear in the receiver There were many Rube Goldberg or transmitter . . . a condition worth bomb-drop arrangements. Some pilots checking, now. It's also worth check­ simply tried holding the bomb on the ing your controls to make sure you towhook before the winch ring, then don't have a significant "double­ making a smooth slideoff at altitude. neutral." Let the control stick center I dreamed up a simple idea of tying from one direction and note the posi­ a thin thread through the bomb tion of the control surface. Then do ring, which then goes forward through the same from the opposite direction. an eyelet and back to the winch ring. If the two final positions of the con­ In this way, as the winch ring slips trol surface differ, you have a double off, it pulls the bomb further onto the neutral . . . and precision flying be­ towhook until the thread breaks. I had comes difficult. The greater the dif­ neither the time nor the courage to try ference between the neutrals, the this idea. greater the difficulty. What to do? Some dropped their bombs from Check for sticky friction or slop in high altitude, while others preferred to your control system. Move the control drop it during their final approach. surface and see if the servo arm moves There were a number of obstacles to Flour bombing release set-up on Bob Peck's accordingly . . . and without play. dropping the bomb from a low alti­ Windfree. Uses extra servo. Check that the hole in the servo arm tude: a high wire fence, nearby tennis (for the clevis or control wire) is not courts, and a baseball backstop. That of excessive diameter. Lastly, have a made the final approach interesting, to serviceman check the cleanliness of say the least. Alex Mladeneo took the pot inside your servo. Here a little first place, with Don Edberg coming cleanup can go a long way. in second. Everyone had a good time. Another new contest idea, this one Recently, the Horowitz and Fogel due to Ed Hoppe. Last Sunday, 24 familes went to Palm Springs for a pilots met at Mira Mesa to try a Sail­ weekend. Out near Borrego Springs plane Bomb Drop Contest. The CD we found a small dry wash in the provided numbered bombs to each desert. What could be more appro­ contestant, these being soft paper priate for the hi-start and some flying? sacks filled with flour, with a beer can Soon the planes were way up there lid ring for affixing the bomb to your among a few wispy clouds and scat­ sailplane. You were scored on dura­ tered turbulence. We stretched out on tion (up to seven minutes) and your the sand and flew for an extended Flour bomb after impact with ground. Number ability to drop the bomb within the Continued on page 82 tag identifies bomber for scoring. JANUARY 1978 41 Older Atlas Van Lines boat used wing to advantage in Unlimited competition.

• The 100 mph barrier is not the far­ know various amounts of wind and Bill Muncey's new Atlas Van Lines fetched idea it was five years ago. chop can help all hulls; however, runs very smooth in all kinds of water Combine the sleek outrigger designs maybe we do not maximize their conditions. of today with the new high per­ use. The top-name unlimited hydros, I have seen several model boaters formance engines from K&B, Super like Pay 'n Pak, Atlas Van Lines, use wings with varying degrees of Tigre, and OPS, and you have a mean U-95, Miss U.S., and Sunny Jim, have success. Some, like John Bridge and machine capable of 70 mph. Next, all used wings to their advantage. Skip Horstman, have used operating you apply speed secrets from a John wings powered by a third servo. This Ackerman workshop, and you have a is great for changing conditions, or boat capable of speeds in the high during heat racing where the wing is 80's. A safe bet is that the 100 mph adjusted in the turns, the beginning barrier is only 3 or 4 years away. of the straightaway, and the end of (Only time will tell.) the straightaway. It's kind of like shift­ As speeds increase, environmental ing gears through the course. Other conditions, such as wind, chop, boaters have used a fixed wing to give humidity, temperature, and baro­ tail lift, which helps the boat stay on metric pressure, have a magnified the water. Dumas Models' Atlas Van effect on the running attitude of a hull Lines and Pay 'n Pak kits have a fixed design and engine performance. Small wing like the prototypes, which can changes in any of these factors can be made adjustable. have a big effect on a boat's per·* How does a wing work? We can formance. Could a properly designed thank Mr. Bernoulli for that principle; wing using sound airfoil principles as the air velocity increases, the improve a hull design so that it could pressure decreases; and as the velocity withstand higher speeds? Maybe al­ decreases, the pressure increases. lowing for a condition such as wind The author's Pay 'n Pak has adjustable wing. Thus, the movements of air flowing can be used as an advantage. We Du-Bro kwik links facilitate fine changes. Continued on page 88

Bill Muncey's new Atlas Van Lines uses latest aerodynamic concepts. Miss North Tool's wing is mounted on center fin, is an abbreviated design with wing tips.

42 MODEL BUILDER Profile of 58 inch long East Coast 12-meter, now called Heritage 12-meter. This is Crump 81 Associates hull.

tice to naught. Every hour of experi­ ence with the boat makes him an hour craftier than the next fellow down the totem pole. There are a few folks who com­ s m e w pete in the class infrequently and do well. Rich Matt comes to mind as a ByD.. o ROD n n ^CARRa d d 'V S good example. But Rich has done his homework, and he knows the im­ • Probably the question that I am ing about just what forces control a portance of good sail shape and con­ most often faced with is, in essence, model yacht. The EC/12 is not an stant trimming. He applies his knowl­ “ Which boat should I buy?" If the easy boat to sail as the wind goes edge to any boat he sails, and no questioner is already associated with over 12-13 knots. The sailplan matter what the class, is always in an existing club, he is really asking eagerly overpowers the rudder, and the top finishers. for inside information on what is the control of the boat passes from The East Coast 12 was born on the latest 50/800 or hot new 36/600 that simple steering to active trimming of drawing board of Charlie Morgan. will win him some trophies. But sails in order to balance the boat While designing an America's Cup more often, the query is posed by a on the chosen course. boat for the 1967 defense, a towing potential skipper who has learned Why give a beginner a boat that tank model of a big 12 never built about model yachting, wants to sail is tough? Simple . . . if he starts in was put into the hands of Buddy some sort of a boat, and may not one of those lightweight, spade- Black, of Tampa, Florida. By 1970, have yet considered the joys of rudder racing boats, he'll never EC/12's had become an established racing. My answer is invariably to develop the understanding required class within the new American choose an established one-design to make any sailboat perform at top Model Yachting Association. The class boat. Given that you do not efficiency. This is an established fact. class secretary at the time was this live in an area which is continually Look at all fhe EC/12 skippers who writer. While some evolutionary lashed with gale force winds, I'd go have spread out into other classes changes occurred in the hull form, one step further and specify an East and done well, and yet the EC/12 by 1977, all manufacturers of the Coast 12-Meter. The reason is class is not invaded and swept away boat were adhering to a well con­ straightforward. The EC/12 is a scale by a rank newcomer. trolled shape and sheer line. Skipper model with too little ballast and too Such a barrier provides a good skill was, and still is, the controlling much sail for its stability. As a re­ deal of protection to the novice skip­ factor in vessel performance, with sult, the skipper is immediately per. By the time he has sailed for a little difference, if any, seen between signed up to do some heavy learn- couple of years, he is just that much the new and old hulls. Also, in 1977, ahead of people entering the class the boat's name was changed to behind him. No new design is going HERITAGE 12-Meter, but I'm having to come along and put all his prac­ Continued on page 98

Jib traveler, 1/16 aluminum mast step, and Author's EC . . . er . . . Heritage/12, "Foxy Lady III" had already won a club regatta on her waterproof R/C switch on the foredeck. first time out!! JANUARY 1978 43 Class A MRP car cloaked in a Cobra GT body. Wing is optional, and is a roll-your-own number. PHOTOS BY AUTHOR BUILDING A PART ONE 1/12 SCALE R/CCAR By DAN RUTHERFORD .. . The fascination of 1/12 scale R/C car racing has taken hold of our far-from- docile C/L Combat veteran. Dan passes on some of the tricks he has learned, which will improve performance. • As a newcomer to R/C car racing, Nationals, I see the need for an article bee and MRP lines are competitive I have been both an observer and a that describes in detail how one of the right out of the box. What will be re­ competitor. As my accomplishments pros sets up his 1/12th car for get- vealed in this article are a bunch of as a competitor are so far not even serious competition. little detail set-up tricks that either aid worth discussing, we won't get it into A surprise to many of you will be handling, add to reliability, or in some that part of the story this time around. the fact that no secrets will be revealed other way help insure that you will But in observing what happens at in this article. The stock, production finish every time you light off the line. many R/C car races, even the ROAR cars offered by JoMac with their Jero- To write this article from my own

Hood area of Cobra GT body. Note large hole for antenna, a real Close-up shows No. 4 sheet metal scew used as a throttle stop. Gears time-saver during frantic pit stops. are 9-tooth pinion and 56-tooth main, a good all-around ratio.

44 MODEL BUILDER limited R/C car experiences would be to blow a lot of smoke in your direction. So one day I showed up at JoMac with tape machine, camera, tri­ pod, note pad and my Class A and B MRP cars. Didn't take very long to locate Bob Welch, who is not only a very good R/C car racer with lots of experience, but is also the designer of the MRP 1 /8th and 1/12th scale R/C cars. Bob agreed to help with this article by letting me in on exactly how he sets up his personal race cars, and we proceeded to almost completely dis­ The kingpin has been raked back 5 degrees with the installation of Sterling thrust wedges. These rupt MRP production for the day, plus give you exact measurement of rake. This really helps straight-line stability. putting the entire JoMac organization back about 40 person-hours. Although Bob and I discussed set-up of MRP cars, many of the things in this article also apply to Jerobee and other 1/12th scale cars. We could have used Jerobee units just as well, but my A and B cars are both MRP, so the choice was logical enough, don't you see? Just like the girls down the street, it's what's up front that counts, so let's start there. For this area, where the guard rail is always a sheet-metal number that does not catch cars by the bumper, the bumper is left stock. Front end of MRP car. Tie rod has extra bends to absorb road shock, protecting servo. Toe-in On a track using a guard rail that doesn't show in photo. Blue Line Hot Stuff around antenna tube base. can trap the bumper, it is bent up slightly at each forward, outside corner. Everybody smacks the rail at one time or another in a race. If the bumper gets trapped, you've got a real problem, but if it skips over the of­ fending portion of the rail, you're still running, having lost just a little bit of time from your mistake. The bumper takes a lot of abuse, so Bob mounts his with two 4-40 socket- head bolts in place of the stock pan­ head screws. The front body mount posts also get their share of punish­ ment, and here, a No. 6 sheet metal screw, 1/2 inch long, is used in place of the No. 4 screws. This is espe­ cially important when using a body like the MRP Cobra Mustang, which Jerobee electric R/C car front end, with Du-Bro ball links for steering linkage. Note shock-absor­ uses a single body mount post up front. bing loop to protect servo. Wire also annealed to make it softer. Foam wheels OK on electrics. When a Can-Am body is used, the two body mount posts are located at aware of the fact that there are other clevises in their starting linkage, Bob the bumper attach points. In this case, more exotic ways of checking for uses the stock wire pieces supplied forget the socket head bolts and use tweak, but when you have 90 seconds with the car. He does bend the tie- the No. 6 sheet metal screws to do until the start of your practice or heat rod in the center, however. The rod is double duty in holding the bumper to race, this method works just fine. bent forward, which increases toe-in the chassis and the body mount posts The basic aluminum plate chassis is on these cars. In fact, you should to the bumper. not cut or modified in any way. Minor always have some, never run with the Last thing to do to the bumper is to tweaks in the plate are either twisted wheels straight ahead. In addition to file a notch in the exact center of it out or compensated for by varying increasing toe-in, putting a bend in the (be sure the bumper itself is centered the spring hardness/softness at each tie-rod gives any excess side load ap­ on the chassis) at the forward-most front wheel. Rarely a plate will be plied to either wheel some place to point. This allows easy checking for tweaked badly in a real terrible smack. go besides into the servo gear train any tweak in the chassis. Just stick a In this case it is trashed, as it is al­ or spindles. narrow-blade screwdriver in the notch most impossible to permanently re­ Bob didn't mention it, but I have and lift the front of the car up slightly. move a bad wrinkle. Better to replace found that after a whole bunch of run­ If the car is sitting on a flat surface, any this piece than fight an evil handling ning, the link between the steering tweak will be easy to see, as one of car that cannot be tamed. servo and the left spindle will have the tires will come off the board be­ Although many racers use ball links flexed itself enough times to finally fore the other. Bob and I are both (made by DuBro) and assorted nylon Continued on page 83 JANUARY 1978 45 Phil Granderson, Jive Combat Team's main Jed Kusik's smile is result of narrowly winning K ill string from Dick Stubblefield's ship is all man, uses carbon fiber reinforced tail boom. 3rd spot on U.S. FAI TR Team for 1978. over Fox engine on Bob Burch’s bird, 7 7 Nats.

By "DIRTY DAM" RUTHERFORD ontrol line PHOTOS BY AUTHOR UNLESS NOTED

• With this, the first column to appear For your information here is a letter I some time now, and has stated so in the in '78, and the promise (threat) of a few just received from George. CIL Speed and Racing Gazette. A meet­ more thousand Dirty Words being sent "During the past year, a lot of people ing was called for at the 77 Nats this your way in the months to come, it have called for the forming of a group to year, and to this date, nothing more has seems highly appropriate to start out be known as the National Control Line been said about it. on a positive note. So. . . Society. Many of the leaders of the spe­ "The time has now come for someone NATIONAL CONTROL cial interest groups have expressed their to step forward and start the ball rolling LINE SOCIETY support for a national association to unite towards the forming of such an organiza­ There has been lots of talk about all control line fliers into a combined tion. Each special interest group is being forming a National Control Line Soci­ group for the advancement of all control asked to select one of its members to ety, but very little has been done in the line fliers, special interest group mem­ represent their interests, and to forward way of actually doing something. Talk bers or not. the name and address of such member is cheap and all of that. But George " 'Dirty' Dan Rutherford gave some ex­ to me. I will then inform each member and Mattei is not one to just talk . . . he is a cellent reasons in his last column in a National Control Line Society will be a guy who likes to do it, not just talk Model Builder magazine. 'Doc' Jackson reality and not some more talk. about it. has been calling for a national group for "A speedy selection and response to this letter by each special interest group is of the utmost importance; with speed, a £ i national group can be formed and work­ ing early in 1978. Let us not neglect this opportunity to put an end to all the talk, and show the modeling world that control line fliers can unite into an organization to benefit all. "Your immediate reply is awaited, George T. Mattei." How about that? Sounds really good to me, and I hope that George will get the necessary backing from not only the special interest groups, but indi- viduual fliers as well. If you would like to contact George directly in regard to the NCLS, write to: George T. Mattei, 105 Franklin Road, Hamden, Connec­ ticut 06517. If you have ideas for the NCLS, George will no doubt be glad to hear of them. Offers of help with NCLS would be super. And any donations to keep things moving . . . I mean for the right amount of money, we could probably not only help with NCLS, but Jim Houston, San Antonio, Texas, was bombardier on B-26, ser. 1388 in WW II. Model has make you a STAR in the world of toy retracts, flaps, OS Max .30’s. airplanes!

46 MODEL BUILDER Even if you are not at all interested in competition flying, many of the AMA policies have both direct and indirect effects on you, and until there is a large group pushing your viewpoints, you probably won't be heard from. All of you Sport Fliers carrying an AMA membership, just for the insur­ ance protection, are aware of the fact that your membership fee gives you insurance carrying a $250.00 de­ ductible clause, aren't you? That's right. Do $275.00 worth of damage with your normally very safe C/L plane, and the AMA's insurance com­ pany pays $25.00, you pay $250.00. See, already I've given you some­ thing to complain about. It's obvious that operators of low-risk C/L planes are subsidizing the modelers flying R/C planes. In the past few months, there have been several very serious accidents involving R/C planes, and Living legend of combat circles, Howard Rush. all are bound to be big-buck set­ He designed Nemesis II, a long time winner. tlements. Support NCLS and quite possibly Les Pardue's *77 Nats team racer was only The forming of the NCLS is not you can help to change things. If you simple, "no gimmicks" racer at March AFB. something to be taken lightly, whether choose to hang by yourself . . . well, you are a go-for-it competition freak or please do. answers. But all of the interest in, and a good ol' Sport Flier. The S.F. or For the C.F. (Competition Freak) or forming of, special interest groups, G.S.F. (Glorified Sport Flier) can bene­ G.C.F. (Glorified Competition Freak), and now the NCLS, would seem to me fit from the additional promotion the advantages to being a part of the to indicate the AMA is doing too much given to his favorite brand of flying in NCLS are obvious and already a part of of the wrong thing, too little of the right that more people will be involved in their thinking. So I probably don't thing, incapable of dealing with and C/L flying, and his voice will be heard, have to go on a big sales pitch to these catering to the many interests rep­ through the NCLS, by the people in the people, many of whom are already resented within the AMA. AMA who determine AMA policy. Say members of one or more of the existing Now, I know for a fact that the butt “ big deal" if you like, but surely you special interest groups. of many criticisms, known as “ The realize that the AMA keeps its ears WHAT DOES THE AMA DO FOR ME? AMA", is interested. And for proof of open to only four groups of fliers. The That is a question all AMA members that, just look at the minutes of Execu­ R/C competition and Sport Fliers com­ have probably asked themselves, at tive meetings, the tremendous amount prise the majority of AMA members, one time or another. The AMA likes to of correspondence generated by John so these two groups grab the attention think it has several good answers to the Worth, Johnny Clemens and the rest of of the AMA. And rightfully so, of question, and I personally have to the AMA officials. So we will assume course. The F/F and C/L competition agree with more than one of the Continued on page 89 types are the other two groups the AMA listens to. Some will disagree with that, but when we look at hard numbers, the F/F and C/L competitors pull a lot of weight for their size. In my opinion, the people left out in the cold are the F/F and C/L Sport Fliers who simply enjoy flying their models and could care less about competition events, or at the most, would be inter­ ested in trying their hand at a low-key event of some kind, using the off-the- wall Sport Flying equipment. You Sport Fliers out there may have been reading my rantings about abolishing the present jr./Sr./Open age (skill?) classification system. Going to a Novice/Amateur/Expert system would definitely make it easier for you to enter competitive modeling. If you agree, who are you, as a group, going to tell about it? Nobody, because as of yet, you aren't even a group, you are a bunch of modelers riding along on the shirt-tails of the competition-oriented modelers, most of whom could care less about Sport Flying in the first "Touche my foot! If you do that again. I'll sic 'D irty Dan' and his cucumbers on ya!" place.

JANUARY 1978 47 FOLKERTS By KURT ENKENHUS . . . Overall winner of MODEL BUILDER'S 1977 Parcel Post Proxy Peanut contest, this has to be one of the best Peanut Scale models ever designed. Plans show "heavy" and "lig h t" versions. • Cleveland, Ohio, 1937 ... the the Goddess of Flight. His SK-3 when preliminary calculations sug­ Thompson Trophy. With rumors of Speed King, the "Pride of Lemont", gested that two minute flights should war already casting shadows over boasted only a 400 horsepower be obtainable if the total weight the Golden Age of aviation, they Menasco Super Buccaneer, but the could be kept to 2 pennies. gathered here for a showdown to see slim, in-line 6 was so smoothly Before discussing the construction who was the fastest in the world. housed that it was the sleekest racer methods which permitted this weight While they all worshipped speed, a there. goal to be attained, let's spend a glance at the bulging cowls con­ The start . . . and the SK-3 trails little time analyzing the performance firmed that most of them put their next to last! Then the Goddess of an indoor rubber-powered model faith in brute force . . . eight hundred smiled, and Rudy Kling, passing one airplane. horsepower or more of radial engine. after another of the eight aircraft MODEL PERFORMANCE ANALYSIS... One man, Clayton Folkerts, an aero­ ahead of him, flashed to a photo­ DESIGNING FOR PERFORMANCE nautical genius, preferred to court finish victory at an average speed of It's clear that the rubber motor 256.91 mph. What made this plane so remark­ able? Details of the fascinating devel­ opment of the SK-3, as well as Bjorn Karlstrom's three-views on which my plans were based, may be found in the February, 1973 issue of American Aircraft Modeller. The aerodynamic features which enshrined the SK-3 in air racing history also give it superlative per­ formance potential as a 13 inch wingspan Peanut scale model. The low aspect ratio wings of generous area, long fuselage, and clean lines result in a model of light wing load­ ing, low drag, and excellent flight Thrust line adjusted by rotating nose button stability which packs plenty of Super-light version has no bulkheads. Please in block. Marks help locate best setting. rubber winds. My enthusiasm grew don't squeeze da fuselagel Plans show both. 48 MODEL BUILDER Biggest surprise to all the proxy fliers at the contest fly o ff was the exceptionally slow flight speed of the Folkerts. The extremely light weight and slow RPM of the large, high pitched prop were obvious clues to its performance capability. must supply the energy consumed in some calculations and past experi­ 1 + ClA ___ indoor cruising flight. The propul­ ence, I believed I could keep the 2 (L/D)Aprop sive energy supplied is equal to the total weight to 2 pennies, or, since where Aprop is the area of a circle specific energy of the motor, er, in there are about 143 pennies in a with the diameter of the propeller. foot-pounds per pound of rubber, pound, to W = .014 pounds. The Since the formula, in fact, indicates times the weight in pounds of rubber drag is therefore that propeller efficiency goes up with used, Wr, times the propeller effi­ D = .014/3.5 = .004 pounds. increasing propeller size, I picked a ciency, Peff. The rate at which a The flight speed is given by the 6.5 inch (0.54 foot) propeller for the model of drag D pounds flying at a aerodynamic formula SK-3, for which Aprop = 0.23 square speed V feet per second consumes V = /2W feet. We now find the propeller energy, is DV foot pounds per V .0023A-Q efficiency to be second. The time it will fly before in which A is the wing area = 0.25 peff = .85_____ = 0.78. using up the available energy is square feet for the SK-3, and Cl 1 + 6x.25 therefore is the airplane lift coefficient. I esti­ t = erWrpeff seconds. mated that, for the particular value 2x3.5x.23 DV of wing aspect ratio of the SK-3, Next, I determined the specific Cl = 0.6 when trimmed near stall. energy, er, of the rubber I had in This formula is correct even when We can now find the flight speed: mind through experiments using a the model climbs and descends V =/2x.014~ = 9.0 feet per homemade torque meter. The aver­ again, because the additional energy V ,ÖÖ23x.25x.6 age of three tests gave consumed in climbing against the second, or 6.1 mph . . . a fast walk. er = 2160 foot-pounds per pound. force of gravity is regained during The propeller efficiency can be A reason for doing several tests in the descent. It tells us that to obtain calculated from the following long flights, we need lots of energetic succession is that the rubber tends to fatigue, and a single test gives rubber and a high propeller effi­ formula, which is based on data from full scale tests: too optimistic a value. ciency, coupled with low drag and petf = 0.85 divided by The final design problem was to flight speed. As we shall see, the drag is directly proportional to the weight of the model, and the flight speed increases as the square root of the weight, so building a light model is an essential prerequisite to high per­ formance. Let's proceed with the SK-3 design calculations! The drag is equal to the total weight of the model, W, divided by the Tift-to-drag ratio, L/D: D = W (L/D) By gliding the model (This test was done with the outdoor model, which was built first. L/D does not depend on model weight, but only on the configuration.) when bal­ anced but without the propeller, the lift-to-drag ratio was found to be L/D = 3.5. In such a test, L/D is equal to the ratio of the horizontal distance Underside photo reveals access opening for hooking up rubber, which is attached to dowel just flown to the vertical descent. From aft of wing's trailing edge. Running motor to rear of fuselage would have caused balance prob.

JANUARY 1978 49 CJ1 o FULL SIZE PLANS AVAILABLE - SEE PAGE 112 MODEL BUILDER determine the size, number of strands, and length of the rubber motor required. A key question is how thick the motor must be to pro­ vide enough torque to produce climb early in the flight, without exceeding that needed for cruising flight later. The required torque, T, in foot­ pounds, is T = PD 2 IT where P is the propeller pitch in feet and D is the drag in pounds. For a 6-1/2 inch diameter propeller, the largest reasonable pitch, and the value I selected, was 13 inches The 1977 Grand Peanut Folkerts SK-3 among some of its competitors during static judging. (1.08 feet). The required torque is It rated third in scale behind the two Jungmanns of Krekovich and Strange, Mooney plans. then T — 1.08X.004 = .00069 foot-pounds the formula for endurance that maxi­ stable, is likely to hit the wall long 2x 3.14 mum flight time is obtained when the before the "race" is over, just like Using my torque meter to wind rubber weight is twice that of the some Indianapolis machinery we some sample motors, I found that 4 structure. However, 92% of the have read about. strands of .050 rubber gave an maximum is obtained when the two CONSTRUCTION average torque of .0011 foot-pounds, are equal. For the SK-3 model, the We have seen that there are many nearly twice too much. Four strands "motor efficiency", as I call it, is factors which promote high model of the next smaller size (.040) gave only 42%. By using a gearbox to airplane performance, but certainly .0006 as an average value, but twice match the high torque of the rubber one of the most important is keep­ as much when nearly fully wound, to the relatively low torque needed ing weight down. which was just what I was looking for cruising flight, much longer flight How light is light? The ultimate for . . . I hoped! Flight trials are times are possible. However, such a is the indoor microfilm model, which the final verdict. The most rubber I model is heavier, flies faster (but, can fly up to nearly an hour. In felt could be used was a 15 inch long due to the large increase in Wr, Peanut Scale, we can borrow the motor weighing 0.35 pennies, or Wr longer) and, unless exceptionally Continued on page 92 = .00245 pounds, with the motor peg located just behind the wing trailing edge in order not to have to add any weight to the nose to main­ tain balance. When added to the structural weight of 1.60 pennies, this brought the flying weight to 1.95 pennies, or W = .0136 pounds. This is slightly less than the 2 pennies weight assumed previously in cal­ culating drag and flight velocity; the corrected values are D = .0039 pounds and V = 8.9 feet per second. The predicted endurance from the first formula is now found to be t = 2160x.00245x.78 = 119 seconds .0039x8.9 or 1 minute 59 seconds. A best flight of 2 minutes, 3 seconds was ob­ tained by my proxy flyer, Walt Mooney, in the contest. To complete the analysis, a cal­ culation has to be made to see if the motor can provide the required number of propeller revolutions. The -F4 distance flown is: s = Vt = 8.9x119 = 1059 feet, ■F3 or 5 laps of a 67 foot diameter -F2 circle. The number of motor turns required is therefore N = s/P = 1059/1.08 = 981, or 62 winds with the usual 16:1 ratio winder. The motor used could take more than this, leaving a little more torque left near the end of the — Bottom flight, which was desirable. Let me emphasize that the present model does not represent an opti­ These dummy formers are used in construction of the super-light "eggshell" fuselage, as des­ mum design. It can be shown from cribed in the text. A full size reproduction of these is included w ith the full size plans package. JANUARY 1978 51 Bill Stroman preps his CO2 Stinson Reliant. Joe Bailey and his Skyfarer. All photos taken Bill Warner and pidgeon-tailed Blériot, power­ at Flight masters' Annual, Mile Square Park. ed by Telco CO2.

FREE FLIGHT SCALE By FERNANDO RAMOS

• The Flightmasters held their 28th event. I wish I could say that it was where almost any design will fly and Annual Scale contest at Mile Square mine, but it wasn't. fly well. Take the Davis DA-2 (home- Park. As usual, the static judging was We had a whole battery of qualified built design), as an example. There done the evening before in the multi­ judges who have done this chore over were two of these entered; one by purpose room of Trident Jr. High the years. While the judging was tak­ Clarence Mather, and the other by School, in Anaheim. There were 60 ing place, there were films and slides Jack Leuken. Clarence's DA-2 had a F/F scale models entered in the various presented to us by Bill Noonan and flight of nearly eight minutes, while events; such as rubber, peanut, CO2, Bill Hannan, which entertained the Jack's put in a high time of 1 minute and electric. Unfortunately, there was contestants. This whole process 58 seconds! If you are not familiar only one entry in gas. The quality of started at 7:30 p.m. and ended at with the Davis, it is a low wing, V- the models keeps getting better and 11 p.m. tailed design, with a very low aspect better, and the overall competition in The flying promptly began at 8 a.m. ratio. A few years ago, no one would static is getting real tough. As to be on Sunday morning. The day started even look at this subject for a model. expected, the most entries were in the out with an overcast sky, but cleared I might add that Ken Hannan had a rubber events, with almost an equal up, with no winds to hamper the fly­ Farman Moustique which turned in a distribution between rubber and pea­ ing. The several hundred spectators high time of 4 minutes, 41 seconds. nut. The next most numerous event were well entertained with the excep­ It hasn't been so long ago that a high was CO2, followed by electric. As for tional flying of all of the various time with a Peanut was in the 30 gas, it was very disappointing to see models. It is amazing how the state of second bracket. only one model in my favorite scale the art has improved to the point Rubber scale has seen tremendous

Just so we'll know what a real, eastern style, free flight scale CD looks like, Dick Benjamin, Rehoboth, Mass., sends us these photos of Bob Thompson during the recent Fall meet of the Connecticut Flying Aces.

52 MODEL BUILDER Stroman's rubber powered Taube passes overhead. Bill Warner's C O j powered Blériot in flight. growth in spite of the rules which the most realistic takeoffs. One presently govern it. Seems as though inconsistency that I have observed is many scale clubs use their own rules that some electric powered models, rather than following the AMA rule when adjusted to R.O.G., will take­ book. There is more diversity in design off beautifully, but then not have than ever before, and it appears that enough juice to keep them air­ the average size for a rubber scale borne for the required 20 second model is around 24-30 inches in span. minimum flight time. Bill Warner's One notable exception to this over the tri-motored Airspeed Ferry would do last couple of years has been the de­ just that. Yet, with a hand launch, it signs of Bill Noonan. Bill has com­ would perform quite nicely. Bill won peted in rubber scale with jumbo size the electric with this most interesting models. These have had a wealth of biplane design. Second place went to detail and fly extremely well. This Bill Noonan's jumbo sized Fokker glides by. Bill Stroman and his unusual Valkyrie. year, Bill built a jumbo DeHavilland Tony Naccarato took 3rd, flying a Hawk Moth. Many of you may have McDonnell M5. certainly prefer it over the Cougar, seen this model at the Nats or in the Competition in CO2 was fierce this pages of MB. I personally feel that even though the Cougar is a near copy year. The flights of nearly every model this could start a new trend in rubber of the Tailwind. in this event were about as realistic models, which I will explain a bit later. Electric, in my opinion, is still not as you could make them. The R.O.G.'s, (Fernando didn't know, at the time he what I would call the “ perfect" source the flight patterns, and landings were wrote this, that the Hawk Moth would ap­ of power for a scale model. Bill just a pleasure to watch. There seemed pear in December MB. wen) Warner seems to be the only one who to be an even spread between Brown Bill Warner had a Compte (Swiss can consistently make almost all his and Telco engines, with each per­ design, I believe) that was a most electric powered models perform as forming equally well. Bill Hannan was spectacular flyer, which brought him they should. I know a lot of people flying a Farman Moustique, which into second place. Third went to Mike will argue with me, but again, it is my won him first place at the Nats. At Mulligan and his Wittman Tailwind. opinion. Batteries are still the weak our Annual it was no exception. Bill's Mike had this model at the Nats, link. They are heavy, and have to be exquisite Farman flew as flawlessly as where he finished in the money in treated with kid gloves during charg­ it looked. Right behind Bill was War­ rubber scale. This stubby-winged and ing, and certainly, they are not cheap! ner's pidgeon-tailed Blériot. This wide-bodied homebuilt is quite an ex­ One positive thing about electric model was powered with a Telco. ceptional model for rubber power. I powered models is that they can make Continued on page 97

Bill Warner, with his 3 electric motored Airspeed AS 4, talks things Joe Bressi and son winding his P-40, which is an excellent flier, over with static judge George James.

JANUARY 1978 53 be trying to figure out how the feats are accomplished, and may find the plot only incidental . . . which is probably why many viewers attend more than once! Not surprisingly, quite a few model builders were involved in the production, and for a pleasant change, they receive suitable credits for their efforts. All manner of minia­ tures were employed, along with radio-controlled devices. In fact, the electro-mechanical stars steal the scenes from the humans, in our opinion. The actors/actresses seem almost foils for the robots, instead of vice versa. The message is strictly entertain­ ment, with a pleasing absence of shock-for-shock's sake language. There is violence, to be sure, but "To have more, desire less ..." somehow the director/writer, George Lucas, makes it seem justified. The • We're not sure how our lead-in bizarre manner imaginable! Some of mix of humans, "un-humans", robots line can be applied to model the special effects are so powerful ('droids) and spacecraft result in the builders, but we found it thought- as to be distracting. Anyone with first really fresh concept to appear provoking anyhow. It was spotted on any mechanical aptitude is bound to in years. Continued on page 94 the marquee of the Rayne Water Softener Company. STAR WARS Every so often we feel compelled to don our critic's costume, usually for an aviation-oriented film. This time, the connection may not be so direct, but we think our audience may be interested. Already reckoned to be the greatest money-grosser of all time, the flick continues to at­ tract long waiting lines of patrons. Curiously, the appeal of this film seems to transcend age boundaries, whereas many science fiction offer­ ings have appealed only to a limited age group. It is difficult to peg "Star Wars" into any particular comparison nitch. Certainly it is reminiscent of the old Buck Rogers and Flash Gordon epics, yet in some ways, it resembles neither. Even though the basic story line might appear simple, the presen­ tation is almost unbelievably com­ plex. The good guys win and the bad Piper Aircraft Corporation has announced its new Tomahawk for 1978. Its design features guys lose all right, but in the most should be a turno n for scale enthusiasts.

Lonnie Cope launches his Renault Farman racer at the '77 Nats. It Scratch-built Monocoupe 90-A, a tribute to the late Earl Johnson, flew in rubber powered speed event. Photo by Chris Clemens. Photo submitted by Phil Cox, Calumet Aircraft Modelers.

54 MODEL BUILDER -CO2— MOSKITO—PHOTOS BY AUTHOR By JACK HEADLEY . . . Reminiscent of the pert little Springfield Waco biplane, designed around the K&B .020 "In fa n t", this tiny sheet balsa bipe has surprising performance with any one of the current CO2 engines. • This little model was designed on a with so small a wing area). There's thing that will conform to the airfoil Thursday, refined on Friday, built on probably even more performance in shape easily. Pin the ribs down to the Saturday . . . but not flown on Sun­ the model, as I've been running the building board, and cement the panels day, as the local store had run out of motor at a medium throttle setting, into place. Be sure, on the top wing, CO2 cylinders and I had to roam all rather than all-out. to recess the root ribs a little, to pro­ over town for some and it was actually Construction is reasonably straight­ vide space for the wing pylon when a week Tuesday before the first flights forward . .. the main concern is to the panels are glued together. While took place but it was worth the wait. make sure that the final assembly is the wings are setting up, cut out the Phew! done correctly, no one likes to see tailplane and fin, and cement these In fact, the first flights were a little an asymmetric biplane! Read on for together now, making sure that the scary, as I didn't have the correct details of the building procedure. fin is truly vertical. down-thrust figured out and the model As we previously mentioned, the The next item is the fuselage frames, kept wanting to return to base via the model doesn't take long to build, and in particular Frame 3, which is lami­ top of my head, hence the "Moskito" if you use one of the new glues, it can nated from two pieces of 1/16 sheet, name. Once trimmed (a lot of down- be constructed very quickly. with the U/C wire squashed between thrust and a tweek of left rudder), the Begin with the wings; by cutting out the two laminates. So we start by mak­ model flew magnificently, if I say so four wing panels, two upper and two ing the undercarriage, and the two myself, with a splendid spiral climb, lower, plus eight wing ribs. Use softish pieces of Frame 3, then epoxy them and a fairish glide (what do you expect wood for these wing panels, some­ Continued on page 87

Not exactly a thermal-catching machine, but it's still a good idea to Moskito and launch platform. Platform to launch author, not plane! include your name and phone number. Performance w ill surprise you. Marking pen trim easy to apply, adds very little weight. Cute ship.

JANUARY 1978 55 TAILPLANE 1/16 " SHEET

5 6 MODEL BUILDER JANUARY 1978 Lars Olofsson, 1975 World FAI Power Champion, sent these photos of his newest ship, "Yana Aminah" (?), featuring the worlds shortest nose moment! Dihedralled stab, triple fins, 6% flat bottomed airfoil, exhaust through pylon top. Climbs like a rocket, glides like a rock, says Lars. FREE FLIGHT » » · « « FOUR YEARS AGO THIS MONTH engine. tests to club meets. Could it be that long? Could what The annual 100 gram vs. 80 gram Rise in postal rates will eliminate be that long? W ell, in )anuary of Coupe debate will finally settle out postal meets. 1974, this column was first written with 90 gram Coupe being the norm Led by consumer advocate groups, by yours truly. What has happened . . . thereby satisfying no one. someone will sue AMA over the in that time in the wide world of No FAI Finals will be held in the quality of the membership decals. free flight? Try these on for size: U.S., because no one wants to host The AMA Nationals will be held The 7 second FAI Power engine the event. in Mexico due to lack of U.S. sites. run has become reality. Schneurle port engines will be So, there they are . . . some predic­ Category II outdoor sites have be­ banned by the EPA as being too tions for the next 4 years. I'm sure come the norm, along with the 3 dangerous. that this is not an all-inclusive list minute AMA max, and the 9 second Gas rationing will reduce all con- and that you could add your own pet engine run. items to the bunch. It'll be inter­ V.T.O. has gone the way of R.O.G. esting (not necessarily fun) to come The last vestiges of Pirelli rubber back in 4 years to see if any have have gone the way of the dodo bird, come true. except for the private stocks of the THREE-VIEW OF THE MONTH. . . privileged few. Super Turkey Unlimited, The long awaited intermediate by Jim Quinn event has appeared to encourage I find it personally very interesting people to fly sport rubber. It's called to note the increase in interest in P-30. the Unlimited Rubber event. With The regular hassle over scale rules the unavailability of Pirelli and the continues . .. Peanut Scale is now a general dissatisfaction with the cur­ flying event with very little to do with rently available rubber, there is a re­ scale. surgence in this event which belies Category III rules are being pro­ the claims that rubber powered flying posed to allow use of fields not is on the way out. In our N.W. large enough for Cat. II. meets, the events which seem to be There are others, but these come Would you let this guy time your last f lyoff growing in number are the rubber to mind. So, looking into the old flight? More on page 64. events . . . nosing out the popular crystal ball can give some clues as to what we can expect during the next 4 years. Here are the predictions: Category I w ill only be flown at Taft. If another site is located for Cat. I, the SoCal fliers will petition AMA for a Cat. 1 -plus category to use at Taft. It will feature 10 minute maxes and 20 second V.T.O. only. Category IV will be proposed and will feature 1 minute maxes, 20 meter towlines, 4 second engine runs, and 5 gram Coupe motors. Peanut Scale rules will be changed again to emphasize the scale factor. Models will not need to fly at all. FAI Power w ill go to 5 second engine runs in order to compensate for the development of the .15 size

58 MODEL BUILDER towline glider events. Jim Quinn's model is an excellent state-of-the-art ship. It is a relatively simple rolled tube fuselage model with simple wing and tail structure. Obviously influenced by the highly successful Bob White designed ships, it de­ serves attention as a ship to build. DARNED GOOD AIRFOIL . . . C.S. (Christian Swartzbach) 6356 Christian Swartzbach is perhaps most well-known for his develop­ ment of the Swartzbach propeller, but here is the airfoil he has devel­ oped for use in the Wakefield event. As mentioned last month in this column, the Wakefield Symposium held in the Scandanavian countries 3 years ago, mentioned 3 airfoil sections as being recommended for use in the Wakefield model. This is one of them. Next month we will carry the coordinates and sketch for had a sample of the sheet aluminum, balsa sheeting is epoxied to the the final choice. If you are into rub­ taken from the wing of the damaged same piece of aluminum. The frame­ ber powered models, the C.S. 6356 model. work of ribs and spars is laid up looks like a good one. This information is provided to you onto the bottom piece of balsa/ MYSTERY MODEL FOR JANUARY third hand, but is generally accurate, aluminum, the aluminum tube lead­ The Civy Boy Mystery Model according to my sources. ing edge is epoxied onto the front brought a deluge of mail from all of Essentially the process is simple, of the framework, and the aluminum the folks out there in free flight once you have the necessary sup­ sheet/balsa sandwich is wrapped land. This one may elicit one letter. plies, which includes sheets of very around this structure and securely If you are the one, drop it to Bill hard 1 mil aluminum .050 balsa epoxied into place. The aluminum/ Northrop and claim your prize . . . a wing skin, aluminum tube leading balsa sheets join at the trailing edge one year subscription to my favorite edge, and lots of weights. and are finished at this point. magazine (Model Builder). The aluminum sheet is cut to span The Russians used this form of Some interesting features of this and chord size (see sketch) and construction for the inner panels of month’s design. It's multi-engined. epoxied under pressure to the .050 their wings, with the outer panels Not just one or two engines, but balsa. Allowances for the nose radius being the more conventional sheet three. All of them are roughly cate­ are made, and the top and bottom balsa type of structure. Although the gorized as 1/2A engines. On top of tnat, it's a seaplane. It's also a free flight model. Did anyone ever build it? Well, at least one was built, if pictures of the model are any indica­ tion. Did it ever fly? Good question. Can you answer it? THOSE MAGNIFICENT ALUMINUM COVERED RUSSIAN FAI POWER WINGS . . . A close-up Several model magazines, includ­ ing this one, have covered the 1977 FAI F.F. World Championships held in Denmark. All have mentioned, or provided photos of the Russian FAI Power models and their alumi­ num sheet covered wings. At the N.W. Semi-Finals, both Charlie and Keith Martin described to me how I wet Reeling a little rough -the morning l mode this wing. these wings were made. Charlie also DARNED GOOD AIRFOIL - CS 6356

NOSE R AD KJSO ^^^. ______

STATION 0 1.25 2.5 5 7.5 10 15 20 30 40 50 60 70 80 90 95 100 UPPER 0.25 2.1 3.2 4.8 5.95 6.88 8.12 8.9 9.6 9.45 8.85 7.95 6.65 5 2.85 1.65 0.3

LOWER 0.25 0.02 0.15 0.51 0.88 1.27 1.96 2.55 3.45 3.75 3.72 3.45 2.91 2.17 1.19 0.55 0

JANUARY 1978 59 WING HAS A DIHEDRAL NOTCH T.E.'S AT RIB STATIONS ANGLE OF 10° PER PANEL ALL RIBS 1/16" C-GRAIN

16 STRDS 1/4" F.A.I. OR 20 STRDS 1/4" SIG

20 TO 24 DIA/24 PITCH PROP co 2 0 -3 /1 6 " 5° RT INCLUDES I2) 3/32" * € r i FINS

MEUSER-BERRY FLOP Λ BLADE SUPPORTS FOR 1/8"sq. HARD TUCK-AW AY ON FOLD 1/8"x 1/2" T. E. STK. STRAIGHT 1/8" X 5/16" & HARD STRAIGHT

TIPS PER B ILL BOGART FUSE TUBES ARE ROLLED WITH 1/16" SHT. WITH PLY DOUBLERS

STATION BULKHEAD TO RISIST STAB HOLD DOWN COMPRESSION 1 -3 /8 " 5° DT L 4 " 2- 1/ 8" L _L

SNUFFER TUBE Γ 5 /8 "Dl A ------42"

43"

5 4 -1 /2 "

BY JIM QUINN AMA 51443

— — = _____u ■ u ------STAB -

60 MODEL BUILDER purpose of such an involved process is not entirely clear, it would seem that this is an innovative attempt to ALUMINUM SHEET COVERED WINGS - RUSSIAN STYLE deal with the problem of minute changes in wing warp, which plague the high speed FAI Power models with their knife edge trim. The only WING TOP caution is that you shouldn't try to CHORD d.t. such a model onto power lines! An interesting and creative step ------1 NOSE forward in the design and execution ------^ RADIUS of model airplanes. FLEX TUBE MOUNTS FOR WING BOTTOM A-2 GLIDERS CHORD Bob Isaacson and )im Walters agree that the ability of an A/2 wing i - to spread the stress evenly from root to tip is a likely condition to suc­ (T) LAYOUT WIDTH OF ALUMINUM TO EQUAL DOUBLE CHORD PLUS NOSE cessful zoom launches when using RADIUS. SPAN TO MAIN PANEL ONLY. circle tow. The East Europeans, .050 BALSA NOSE RADIUS AREA notably the Russians, are able to get 3 - by with using relatively light wings ·■····■ ^ \ ^ ■ - ~ V '* 34567 ■·"i--_ 3 on their ships and still make high I & ' I climbing zoom launches. There are ways of making evenly stressed (2 ) EPOXY .050 BALSA SHEET UNDER PRESSURE TO THE TOP & BOTTOM wings, but for most of us, the CHORD AREA OF THE ALUMINUM. methods may be unfamiliar or be­ yond our equipment's ability to help us do it. So, we tolerate heavy wings in order to provide enough structure to keep the wing from breaking, and continue to use the well-known brass joiner tubes and music wire. We also continue to break our wings just (3) EPOXY RIBS & SPARS ONTO BOTTOM OF BALSA-ALUM INU M "SANDWICH'' where the brass tubing ends. Making EPOXY IN ALUMINUM TUBE LEADING EDGE & WRAP TOP OF ALUMINUM tubeless wings appears to be an -B A LS A SANDWICH OVER RIBS & SPARS. EPOXY IN PLACE. answer. The next question is, then, WEIGHT STRUCTURE TO INSURE ADHESION. how to accurately drill the holes in the plywood wing root ribs and more to the point, how to keep the holes 3. Slide pieces of brass tube over What you now have is a wing from enlarging during the life of the the wing mount wires. which will flex to the extent that wing. 4. Slide wing mount wires, with the wing wires will allow it, evenly I believe that I have a possible brass tube, into the plywood wing stressed structure which doesn't have solution to the problem. It's simple ribs mounted in the wing. a defined end point, and wing wire to the point of incredibiity. Here's 5. With micro balloons and Hot holes which won't wear out and can how: Stuff, adhere the small lengths of be constructed by the average A/2 1. Drill the plywood ribs as usual brass tube to each plywood rib. builder. (oversize). 6. Remove the wing wires and W orth a try? Maybe there are 2. Cut small pieces of brass tube completely surround each of the some other ways, but this one has (approximately 3/16 inch) to fit small brass tubes with micro bal­ worked for me. one for each rib hole. loons and Hot Stuff. Continued on page 91

Charlie Sotich with his Wakefield, at the '77 Nats. His models never Mrs. Virgil Coker holds "Coker's Cooker" A Gas model. Shoulder seem to age, they just get older (Don't we a ll!!) Shafer photo. wing has 650 sq. in. area. Update of classic design. Shafer photo.

JANUARY 1978 61 Haif*A Pietenpol from House of Balsa can be anything from a trainer to a stand-off scale winner; builder's choice.

the ideal prop. Here are the variables and their effects. Diameter: The amount of air driven by the prop is related to the area of The 1 / 2 - A $ c m the prop disc, that is A - dA Larger 4 areas yield more efficient coupling of By LARRY RENGER power to the air. Small differences in diameter mean large difference in • This column will be the first pub­ so it is twisted to match. There are power required. lished after a significant personal important factors to consider in the Pitch: Pitch tells you how many event for the author. I have left Cox choice of a propeller. inches forward you'll go for each turn and now work for a medical appliance Power available: This is what the of the engine. Power required is re­ company. In my new job, I manage a engine puts out, wishful thinking lated "linearly" to pitch. group which engineers various heart won't give you any more than what Blade width, airfoil, tip configura­ catheters, or widgets which help you have. tion: As in a well-designed wing, the eliminate the need for open heart Aircraft size, drag, and weight: This exact form of a prop affects the effi­ surgery, in some cases. is what you want your engine to pull, ciency. Blade width has the most The above event has a couple of and you also have to consider what noticeable effect of this group. effects, first, please send any letters, kind of performance you want. Prop blade flex: This is so deep and etc., to me, care of this magazine, not Performance: This is the type of fly­ complex a subject that it is neatly at Cox. Second, I should oe able to ing you intend to do. Straight up for avoided by the flat statement that the develop a more objective view of the U/C Stunt or Free Flight, top speed for more rigid a prop is, the better it is. 1/2A Scene. I have tried to be objec­ a speed job, in between for pylon Confused? Hang in there, it isn't all tive in the past, but nobody's perfect! racing or combat, slow and steady that bad, because we are only choos­ BEGINNERS WORKBENCH for U/C or R/C trainers. ing a prop, not designing one. Also This month, let's discuss propellers. Once you have nailed down the the selection is limited and the appli­ The propeller is a type of wing. It plane, engine, and desired per­ cation allows a pretty broad tolerance "flies" in a peculiar twisted airstream, formance, tne problem is how to select to error. First, read the kit recommenda­ tions, if any, and also the engine manufacturers recommendations. Next, I will stick my neck out and provide this chart as a very rough guide. Numbers are "diameter x pitch". These just represent the starting point. I have found that I usually try several propellers, including a few which shouldn't work, before I find one which I like the best for a given airplane, engine, and style of flying. For example, I have a 1/2A Miss Norway with two different engines I use on different occasions. One en­ gine has a Tee Dee crankshaft, QRC The Dumas 1/2A Cabin Cruiser can be neat fun with throttle and rudder on R/C, or just plain piston, cylinder, muffler, and drilled free running . .. ot tethered. Medallion carburetor; the other is a 62 MODEL BUILDER This attractive Citabria, by Jerry Farr, Abilene, Texas, for 1/2A R/C. has a 200 sq. in. wing, and weighs 18 oz. An excellent example of imagination and ingenuity producing a winner. hopped up, hi-nitro, bored venturi Tee Dee with no muffler. For the first engine, I like a narrow blade 6 x 2 made from an old Tornado 7x2, full- blade, wood prop. On the hi-nitro engine, I run a 5 x 3, because I like the sound and the level flight speed as opposed to climbing ability. The air­ plane is the same, but engine and intended style of flying have both changed, so the "correct" prop is different. Chris Leila wowed 'em in New York by flying this 1 /2A Sunspot C/L stunter on the ice rink All you really can do is to experi­ at Rockefeller Center. ment, starting from what the chart speed judgements. shows, and see what works best. on the needle valve setting, here is a That's what I do myself! In speed and For the more advanced flier, I have possible culprit. The nylon carburetor pylon racing events, be sure to use a a maintenance tip: If you have an body around the crankcase "grows" stopwatch on a timed course; your old Tee Dee or Medallion engine, and with time. Eventually, you get an air ear will lie to you when it comes to it has good compression but is erratic leak under the carburetor. If you are using the crankshaft pressure tap, the U/C FF R/C problem is worse. I know two solu­ ENGINE STUNT COMBAT TRAINER COMP. SCALE TRAINER AEROBAT RACING tions. First, you can replace the nylon Reed Valve 5 x 3 5 x 3 6 x 3 DNA 6 x 3 6 x 3 DNA DNA 1 port 6 x 3 part, or second, you can remove it, Reed Valve 5 x 3 5 x 3 6 x 3 DNA 7 x 2 6 x 3 5 x 3 DNA then seal it to the case with a very 2 port thin and carefully-applied dose of Tee Dee Std. 6 x 3 5 x 3 DNA 5 x 3 7 x 2 6 x 3 5 x 3 5 x 3 epoxy into the shaft opening, or up 7 x 2 5 x 4 6 x 2 7 X 3Va 6 x 3 5 x 4 into the venturi. Re-drill the crank­ 5V« X 4 6 x 3 shaft pressure tap, if that's being used. 7 x 2 Next, there is another newsletter Tee Dee, 6 x 3 5 x 3 DNA 6 x 3 DNA DNA 6 x 3 5 x 3 Pressure and 7 x 2 5 x 4 7 x 2 5 x 4 which appeals to the 1/2A U/C flyer. Hi Nitro 5’/2 X 4 This one is called CL-RPM and is pub- 6 x 3 Continued on page 96

Cox Hobbies’ new Cessna Centurian. "So close to ready-to-fly you won't believe it." Pre-painted, with engine and control rods in place.

JANUARY 1978 63 You guessed it! That is really Dave "Whatsistrum" on page 58, laun- At top: Remember to wind rubber backwards, and launch tail first! ching his Canardart on a flight over Beirut, to survey enemy guns. Bottom: Completed parts, dihedral added, ready for assembly. The idea behind Canardart was simply to do something a little differ­ ent, try a tail-first design in a simple PHOTOS BY AUTHOR format (none of the sophisticated Ihe canard"” Doug joyce stuff for us) and build By DAVE LINSTRUM . . . in musical circles, it might be called a "varia­ something suited to small sites. Would tion on a theme", but modelers would just likely say that the darn thing you believe flying in the street? That's goes "bass ackwards"! Call it what you will, it's a fun project. what we did before the snipers came. • Back when the author lived in Ehling, who later modified it to what The plans reproduced here are full Beirut (we got out fast when the guns we now know as the AMA Cub. The size. If you get a kit, simply tape started to go off, at the start of the basic difference is in the area of the down the covering onionskin and civil war) we had plenty of building flying surfaces . . . the old Dart had a build on it, noting that the fin goes time but little to build with. We had nice, racy sweptback LE on the wing. It on the opposite end of the motorstick brought a few Delta Dart kits along is still available as Sig kit FF-4. You from the normal model. If you choose with us, and one of them happened to can make a Canardart from the to build from the scrap box, make a be the old style Delta Dart, kitted by material in this kit, or scratch build xerographic copy of the plans (never Sig as the AMA Racer. This was the with balsa, tissue and a North Pacific cut up your precious MB) and tape prop. original design as conceived by Frank Continued on page 90

Parts laid out and glued on the AMA Dart plans/covering material. Dave Linstrum with his completed Canardart. Now the question is, if Up to this point, the Dart and Canardart are alike. some kid brings one to a Delta Dart contest, is he legal?

64 MODEL BUILDER TRIM & GLUE AT 0 THRUST

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6 6 MODEL BUILDER • Thermals are the most important, and least understood, “ Tool of the Trade" to free-flight modelers. Not only is it important to know how to detect them in order to assure a good flight during a contest, but it's equally important to be able to detect their absence, so that a test flight doesn't become a long exhausting chase. I've read a lot about weather, and thermal generation, but nowhere have I found a simple, dependable method to detect and forecast them; so hope­ fully this material will fill that bill. Whenever we deal with anything having to do with the ocean of at­ mosphere around us, we are talking about meteorology, the science of forecasting the weather. Here, since we are dealing with phenomena of a very small area, and a very small field of action, we are actually dealing with micro-meteorology. Now that we have defined the terms, let's see what factors are involved in thermal genera­ tion and forecasting. The theory I am going to lay out is based upon wind shifts as thermals pass by an area. As we are in the Northern Hemisphere, winds about a low-pressure area . . . which is what a thermal is . . . are deflected to the right, or counterclockwise. It is this physical deflection, detectable and THE WEATHER THIS YEAR HAS REALLY BEEN SOMETHING!" dependable, upon which the follow­ ing theory is based.

Therm*/ DETECTING By JEAN ANDREWS . ., Having the "ultim ate aircraft" for your favorite free flight event won't get you in the winner's circle, unless you know when and where to launch it to catch that "good air". Here's how. Probably the most important factor in thermal detecting is being alert to small changes in wind direction and velocity, as either of these factors is a symptom of activity in the air around us. Knowledge of the field on which you will be flying will help, of course, but the main thing to remember is that these rules and theories will hold up at even the most unfamiliar field, if the modeler is alert to changes in the atmosphere as the day progresses. Okay? Here we go. Remember that the wind is deflected to the right, or counterclockwise, around a low pres­ sure area in the Northern hemisphere. All diagrams show five wind-drift in­ dicators set up around the thermal core, and there is no allowance for wind. This is where the practice is going to come in, because in most cases, these wind streamers will be set up far apart, or non-existent, so you, the modeler, will have to use the exist­ ing wind indicators, plus your nose, to detect wind shifts. Surface winds will distort the shape of the thermal, deflecting it down-

JANUARY 1978 67 wind. The minute we release our air­ planes, they also drift with the wind, so it is sometimes best to wait until the main body of the thermal has reached your launch site, even though other airplanes may already be utiliz­ ing the lift. Be patient! There's plenty of lift for all to use! FIGURE I This is the condition before the ther­ mal starts to break loose. Winds are non-existent, or puffy and light, and air temperatures are stable. The air laying in contact with the ground is being heated by contact with the warm surface, though, and temperature- change instruments stationed around the area may show a slight increase in temperature as the condition, warm air under cooler air, becomes more unstable. TIGURE II The air which has been heated by contact with the ground until it is warmer than the air laying over it, has BIRTH . . Circulation; counter-clockwise circulation begins. Temperatures are still stable or started to rise. As it starts to rise, slightly variable. more air flows into the center of the thermal, and since we are in the this thermal, because there is not yet fringes of the thermal rather than Northern hemisphere, this flow is de­ too much turbulence associated with drifting into the middle of it. flected counterclockwise. The wind- the center 'bubble.' Temperatures will FIGURE IV direction streamers are beginning to show a slight rise now, although it The mature stage of the thermal is show this displacement, although the will be slow and unstable. Models the most visible stage, because dust- temperatures still have not shown any which are trimmed to circle to the devils will occasionally form in the appreciable change. right will ascend just as smoothly as core. As the bubble of air ascends, FIGURE III those gliding to tne left, and at this more air rushes in to fill this area, This is the stage at which thermals stage, the machines circling to the and this air will show a distinct rise should be used. The bubble of air is right will have a slight advantage be­ in temperature. This rise is due to the ascending rapidly, and the circulation cause they will center themselves in air's descending and being heated by is firmly established. A marginally- the core of the thermal, while those compression . . . not due to any heat­ stable airplane will be able to ride circling to the left will flirt with the ing applied by the surface. A considerable amount of tur­ bulence is now associated with the thermal, and with the boundaries of it. Ships circling to the left w ill have more of a chance of surviving now, although they may be tipped over into a spin. Monels circling to the right will be constantly in the turbulence around the bubble, and may or may not be able to utilize the strong lift now present. FIGURE V The lifting 'bubble' has now broken away from the surface, and though the thermal is still strong and usable, it is almost impossible to detect unless some other airplanes, or birds, are already circling in it. The surface winds have dropped off until they are almost stable. Temperatures at the surface still show an increase, because of the continuing flow of air down­ ward and onto the surface. Notice that the circulation around the bubble is still counterclockwise, and that there will still be considerable turbulence around the boundary of the thermal. So much for the theory of thermal detecting; now for the practical side. DEVELOPING . . Circulation; strongly counter-clockwise; temperatures stable or slight increase First of all, watch for thermal as air is drawn into body of thermal. "Pulses." Thermals tend to go through

6 8 MODEL BUILDER the lenses. These "80-20" lenses are available through most optometrists, and are used mostly for flying, be­ cause they don't change any of the colors . .. just darken them. I have found them invaluable when looking into a bright desert sky, because 0 they dampen down the glare and allow me to see columns of dust and pollen, indicating a thermal, which are invisible to the naked eye. "Fluffies", seeds of cattails blown into the air, are also handy, not just because they will ride the light surface thermals that presage a thermal, but also because they will indicate a wind shift as it begins. For this reason I always have a few extras in my flight box. That's about it. Practice, practice, practice, is what makes perfect. Watch ALL conditions the next visit to the field. Be aware of the conditions as you observe thermal pulses coming through, so you can launch and fly with more confidence, and HAPPY HUNTING! ·

M ATURITY . . Circulation; strongly counter-clockwise, with possible dust-devils in core. Temperatures increase. cycles, with a predictable span of time between them, so watch and time a few pulses. This way you will be ready to launch (rubber motor wound, en­ gine fueled and ready to be cranked, fuses in place, starter fuse where «/ν'· handy, and lighted, etc.) when the thermal cycle is at its most usable stage. Secondly, watch for anything you k can use for wind-direction indicators. Tents, streamers, smoke columns, dust trails from cars and motorcycles, are all good indicators. Be alert to any J- change in the wind direction or velocity, because this will mean a thermal somewhere in the vicinity. Knowing and understanding the above theory will help you locate it, but familiarity with the individual field will help immeasurably to in­ crease consistency and remove the "luck" factor from your thermal hunting. Thirdly, and probably most impor­ tant of all, KNOW YOUR AIRPLANE! Know where it will be when the prop folds, or the engine shuts off, or the tow line unhooks. Fly the machine often enough that you know whether the airplane will handle rough turbu­ lence in the center of a mature ther­ mal, or whether it might be better to wait until another thermal comes along that may be smoother. Remember also, that there are a lot of outside factors which help in thermal-finding. For instance, I wear a BREAKAWAY . . Circulation; light and variable at the ground, with strong counter-clockwise set of sunglasses which only pass rotation aloft. Much turbulence around bubble. Temperatures at surface show increase, due to twenty percent of the light through heating by compression as air flows down and into area to fill vacuum left by bubble. JANUARY 1978 69 Pylon...... Continued from page 21 later they were ready for competition. SOUTH W ES T The original plan had changed, how­ ever . . . Whit was the pilot and Bob the caller. The AMA Nationals held in River­ side, California, this August, marked the tenth Nats that Whit has attended, and the ninth in which he has partici­ pated. It's fitting that this decade of activity started in California . . . at the Los Alamitos Nationals. Between Los Alamitos and River­ side, Whit has been NMPRA Grand Champion (1969), represented the United States in the world champion­ ships (1972), and has won numerous local and regional titles. His trophies have become a major problem for his mother (who exercised her house­ wifely perogative some years ago and banished many of them to the garage). It's no exaggeration to say that R/C has been a way of life for Whit throughout his teens and into his twen­ ties. He has participated in contests throughout the mainland United States, in Hawaii, and in England. On entering college in 1972, he found he had to restrict his flying to pylon, be­ cause of lack of practice time for pat­ tern. Last year, 1976, was one of his best racing years . . . he won two of the four contests he entered. Currently secretary of the NMPRA, Whit will return to the University of California, Berkeley, after the River­ side Nats, to begin graduate work in business administration. He received his bachelor's degree, with a major in architecture, from Berkeley in 1976 (in his freshman year, he received an AMA scholarship). His long-range plans include a career in real estate planning and investment. . . and con­ tinued participation in R/C modeling. We're sorry to see Whit leave racing, even for a short period of time, but the nitro has obviously gotten into his blood, and there's little doubt that he'll be back racing after IF EVER A SHOW he's finished his graduate work. Good luck from all racers, Whit. WAS FOR QUARTER MIDGET CHAMPIONSHIPS AND THE KIDS OF ALL AGES DOOLITTLE TROPHY RACE On September 10 and 11, 1977, a total of 53 Q-M racers came to Rough THIS IS IT! River State Park, situated in the North­ eastern part of Kentucky. I was unable luadrons o f model planes. Flotillas of model boats, to attend this spectacular race due to Traffic jams of model cars. that back injury you heard all about last month, so we're publishing the It’s the Southwest Modelers Show, and it’s results as sent to us by C.D. Shorty all for fun. Come see. Holsclaw, and photographs taken by Allen Booth, for this column. From talking with some of the flyers lanuary zist οι zzna who attended, it sounds like a carbon copy of the previous years' races; fomen’s Building State Fair of Texas Dali beautiful fall weather, friendly hosts, more good food than could possibly

70 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL B >ER SENT YOU! MODEL BUILDER ANNOUNCING! MODELS BUILDER m asraz/ne s FOURTH ANNUAL INTERNATIONAL Parcel Post Proxy Peanut RUBBER SCALE CONTEST! _j------SPECIAL ANNOUNCEMENT ------^ Because o f the lim ited time available to MODEL Every peanut model, from near or far, will be BUILDER'S staff for the purpose of properly con­ proxy flown, indoors, by some of the U.S.A.'s best ducting and staying on top of a world-wide postal rubber scale flyers, including Walt Mooney, Bill com petition, we have obtained the capable services Hannan, Clarence Mather, Bob Peck, Fernando of Chuck Conover, a local modeler and Peanut spec­ Ramos, Bill Warner, and many others. ialist, who w ill manage the 1978 contest. The result Local modelers will be allowed to enter, but w ill be prom pt processing o f entries, score sheets, their planes must also be proxy flown, and no verbal tabulation, prize awarding, and model return. We ap­ or physical help will be allowed from the owner. . . ologize for past delays and confusion, and assure you only written instructions to the proxy flier, as that it will not happen again! allowed for all entries. ŽÉ______9Ě Open to modelers from all parts of the world... any nationality... any age... any sex... come one,come all!

AWARDS to include TROPHIES and MERCHANDISE . . . ALSO, a KRAFT RADIO SYSTEM to the GRAND PEANUT of 1978! (HIGHEST OVERALL COMBINED STATIC AND FLIGHT SCORE) Other prizes include such items as; Peanut Scale kits and materials, Astro Flight and VL Products electric motors. Brown Jr. twin and single cylinder CO2 engines, Uber Skiver knives and sets . . . over 50 trophy and merchandise awards altogether!

Contest Director: CARL HATRAK Chief Static Judge: RUSS BARRERA Competition will be divided into five (5) classes: Pioneer. Scoring will be based on the total o f each entry's static World War I, Golden Age. World War II. and Modern. There scale points (100 maximum) and flight points (100 max- w ill also be individual awards such as; most distant entry, mum). Static judging will be according to AMA Indoor best shipping container, entry most damaged in shipping Rubber Scale rules. Flight points w ill be the average o f the (Don't try hard for that one!), best entry built from Walt two best flights out of four official flights (10 seconds Mooney plans, best model by a female, best entry by any minimum, 100 seconds maximum). Ties w ill be broken by m o d e le r u n d e r 15 years o f age, oldest q u a lify in g contestant, highest single score, or a fly-off. Number o f attempts to be youngest qualifying contestant, best biplane (Big John limited, subject to size of total entry. DO NOT SEND UN­ Award!), best entry built from a Peck-Polymers kit. longest TESTED MODELS! A three-man jury w ill preside over all flight, most static points, plus a few surprises. decisions. SCHEDULE: Register by mail on or before February 1, 1978, Models to be on hand on or before April 1, 1978. Contest to be held approximately April 15 to May 1,1978. Send in now for your registration form, which includes an entry blank, a complete set of rules, and other particulars. Write to:

MODEL BUILDER PROXY PEANUT CONTEST 621 West Nineteenth St., Costa Mesa, California 92627 USA The receiver is extremely small, measuring only 1-1/8 x 1-3/16 x 7/8 inches, and weighing only 1-1/2 ounces, including harness. It is built »S:.- = on two PC boards of equal size, one holding the audio and decoder IC's, and the other, all the RF and IF and FOX service is the World’s fin est. A sk the man who related circuitry. The layout is un­ owns one. We will airmail you parts or give technical cluttered and extremely neat, with no advice-call SO 1-646-1656. crowding of components. The latter .. all appear to be of high quality, with I ox 19RC names like Texas Instrument, Fair- 31.95 Fox 25RC 31.95 child, and Toko being in evidence. Fox 19CL 23.95 Fox 25CL 23.95 Circuitwise, again no surprises. A Th e Fox 19 ϊκ a sim ple con ven tion ally The Fox 2b is lighter weight and bums double-tuned front end and half-fre­ designed engine that for no obvious less fuel than 29s or 35s yet has plenty reason runs amazingly well. of power to fly models calling for 29s quency crystal oscillator are followed It outperforms most BB schueurle or 35s. Starts easily. Runs reliably sported engines. Buy one. priced modestly. A truly fun engine^ by the usual mixer, three stages of IF, and a detector, before going to AUTHORIZED FOX IMPORTERS & SERVICE CENTERS the audio and decoder sections. rCANADA - Ron Shettler FINLAND- Jukka Vatanon Shettler Enterprises Racing Hobby Regulated voltage is used at various Pottery Road, R.R. 3 / r P .O . Box 130 critical stages. Thus the receiver has Vernon, B.C., Canada VIT 6 L 6 , k00151 H elsin k i 15, Finland 604-542-4151 the one-cell-out capability so im­ SWEDEN — Stig Baverfalk ENGLAND - John Haytree|j|j I Wentzel'e Hobby ΛΒ portant to getting your bird back on Fox Manufacturing Co. U.Kv M F ack S-161 14 Bromma the ground in one piece in the event Shutterton Industrial EstatcrgH Stockholm, Sweden Exeter Road, Dawlish 25 25 10 of a cell going out in the flight pack. Devon EX7 ONH, England \ P Dawlish (0626) 864564 ^ If one cell does fail, it does not GREECE — Theodor Astifidis noticeably affect range; your only AUSTRALIA — Jim Davie Rania's The Hobby Shop Futaba Sales Australia Pty. Ltd. M etam orfoseos 87 clue will be a slightly less responsive 56 L ev a n sw ell Road Moschaton, Athens, Greece airplane as the servos lose some of Moorabbin, Victoria 3189, Australia 94 17 837 95 9477 their "zip ". Therefore, it is a good SOUTH AFRICA -Peter 01iver| BELGIUM - Phil Cohen Pix Raceways Pty. Ltd. idea to train yourself to recognize the Tenco Division P.O. Box 48148 Comptoir Commercial & Industriel R o o s e v e lt Park 2129 normal speed of the servos and con­ 358-362 Ave de la Couronne Johannesburg, South Africa trols, and to look for any loss of 1050 B russels, Relgiupi speed during your preflight. ,02/49.91.40/10-1 F O X MANUFACTURING COMPANY 5305 Tpwson Avenue, Fort Smith, Arkonsos 72901 The receiver current drain is 24 milliamps, which compares favor­ ably with most others on the market. be eaten, and six rounds of fast and erratic while zipping around the Antenna length is the more or less furious racing. course, his superior engine/prop com­ standard 36 inches. Tuned pipes were permitted, and bination allowed him to finish about SERVOS this allowed lap times to drop slight­ 10 feet ahead of Jacobson. Final order As in the rest of the system, the ly. To be competitive, you had to be was Stevens, Jacobson, Grove, and don't-fool-with-it-if-it-works approach capable of flying the course in the mid Zink. In winning the race, Stevens has been followed in the servos. The to high 1:30's consistently. also set the lowest time of the meet. .. proven and popular Dunham D-1 1:31.1. Jacobson was close behind mechanics are used, driven by a TOP 10 FINISHERS with a 1:32.8. single board amplifier designed Name Points Best Time around the Texas Instruments 1. Bill Weesner 24 1:34 HAPPY NEW YEAR! Hope it doesn't 2. Bob Ruether 22 1:35 hurt too much. Jim · SN28640 Integrated Circuit. 3. Greg Doe 22 1:40 Actual size of this servo, less mount, is 1-1/2 inches high, 2 inches 4. Bob Nelson 21’/2 1:34 Mathes...... Continued from page 23 5. Ronald Bressler 21 1:41 long, and 3/4 inch wide, including 6. Gail Jacobson 21 1:36 ears, but not the height of the output 7. Bobby Blouch 20 1:38 point . . . Do not attempt to operate shaft or the arm. The individual servo 8. Al Grove 19’/2 1:39 the equipment while the indicator is weight is 1-1/4 ounces, including 9. Denis Beilich 19V2 1:36 flashing, as total system failure is arm and its 6-1/2 inch long lead. 10. Dr. Bill Adams 19 1:45 inevitable. There are a lot of this type of servo Flyoffs were used to break ties for The electronics for the battery con­ flying around in airplanes as small as second and fifth places, in this contest dition indicator is located on its own 1/2A's, so size and weight can be for the Quarter-Midget Champion­ PC board, on the upper right side of classified as average. ships. As you can see by the list, the case. The LED flashing point is A smaller servo, using the Dun­ Crazy Bill Weesner brought the preset, and requires no adjustment or ham D-5 Micro mechanics is avail­ marbles home to Indiana, as I (ahem) maintenance. able on order, at no increase in sys­ couldn't attend the event. The transmitter current drain is 90 tem price. This is the same mechan­ The 12 fastest fliers qualified for mils. Since this is an unvarying load, ics as used by Cannon, D & R, and the grudge-type "Doolittle Race". we can safely assume an "O N " time Ace R/C, but the motor, amplifier, Four heats were run to weed out the of over five hours being available and in some cases the gear ratio, men from the boys, and Paul Zink, with the 500 MAH battery being differ from one brand to another. Lynn Stevens, Gail Jacobson, and Al used. Bear in mind that this is not This smaller servo was not tested Grove were to be the finalists in the system time. Almost all systems have at this time. last of many exciting races. Early in a much higher transmitter operating The throttle connection is made the last race it was soon obvious that time capability than that of the air­ by the use of a clever sliding arm everyone was using his best prop for borne system. fitting that permits precise adjust­ this one. Though Stevens was a bit RECEIVER ment of total pushrod travel. This 72 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER KIT FEATURES: No cutting or other purchase required to complete kit, (w ith the exception of a good quality white glue). All parts are precision cut from select, kiln dried wood and high quality alu­ minum. Zinc plated, quality hardware. A ll in fool-proof, easy to assemble, kit form with c o m p le te instructions for assembly and usage. Handles 8Vz" x 17" sheets of plastic. ONLY , POSTPAID IN THE U.S.

CShipped via UPS—For air service, add $2.00) Canadians—add $2.00 for surface shipment, $4.00 for air. All other foreign orders—add $3.00 US for surface shipment. $10.00 US for air. For immediate shipment, send Postal Money Order or certified check. U.S. personal checks welcome, but allow 3 weeks extra.

ABS Plastic Sheets for the Formicator— A ll sheets 8 V2" x 17"— Packs Only PCS. PACK THE LOW COST VÄCOUM FORMER THICKNESS PER PACK PRICE .020(1/50")...... 30 $13.00 .030(1/32")...... 20 13.00 THAT WORKS LIKE A PRO! .045 (3/64")...... 13 13.00 Almost two full years of research went into the development .060 (1/16")...... 10 13.00 of this product to be su re it would be easy to assemble, easy .090(3/32")...... 6 ...... 13.00 to use, reasonably priced, and still perform as well as vacuum forming machines used in light industry. Assortment Pack (see below) 13.00 Assortment Pack contains .' 6·.020/ 4 ·.030/ 3-.045 Used with a home oven and a hose type vacuum cleaner, the 2-,060/ a n d 1-.090 sheets. Any pack $12.00 when Formicator w ill make part after part with ease and speed— ordered w ith the Formicator. ALL ABS is white only. from Peanut Scale to giant-size R/C; fairings, cowls, wheel A ll ABS packs shipped Postpaid in the U.S.—Foreign add $2.00—For air in U.S. add $2.00—For air to pants, detailed panels, wing tips, etc., etc. The only lim itation Foreign, consult your Post for 4 lb. air rate and include is your imagination. We’ve worked on that too . . . the in ­ with order. International money orders only. structions are loaded with information and suggestions. The Formicator will open up a whole new creative world for every modeler. {We even put in some ideas for things wives can Idμ Development. lac. m ake fo r th e ir craft projects!) P.0. Bat 73S9 Ncwtrk. Del,war, 19702

makes it possible to get the throttle the battery and the switch. The 8- material and workmanship, which set for maximum opening, proper inch lead provided is adequate in makes it pretty well all-inclusive. It idle, and cutoff at low trim. length for most installations, and in does not cover damage from misuse, The servo amplifier standing cur­ my opinion, leaving out this connec­ accident, water or repairs or modifi­ rent is 8 mils, increasing to an tor reduces the number of things cations done outside the Mathes average of 130 as the servo is that can come unplugged and ruin facilities or service agencies. operated with no load, and to 350 your fun. The instruction manual includes under stalled conditions. These are The total harness length from bat­ some do's and do not's for when pretty average figures, and since they tery to receiver is 15 inches, and a your system needs service. They are constantly varying under flight separate charge connector is found are all pretty basic and common conditions, it is not possible to cal­ on the end of a five-inch lead. A sense things, but can be considered culate exactly how much flight time separate 6-inch extension is fur­ as a good checklist. All service is is available per charge, lust be sure nished and w ill probably be most being done by Moses R/C Elec­ that none of your controls bottom useful when used in the aileron tronics, for which there has been a and stall your servos; you should be position. change of address from the one in safe for 1-1/2 hours or so in the CHARGER the manual. Chuck is now located average airplane. A transformer-isolated, dual, wall- at 925 N. Main St., Orange, CA A complete set of servo mounting mounted charger is provided. It can 92666; (714) 639-8886. accessories is included, from grom­ be used to charge the system bat­ ROASTS mets and screws to single, double, teries individually or simultaneously, I really didn't like it all! But I triple, and side mounts. Included and has a separate LED charge in­ realize that some of the things I also are a goodly assortment of out­ dicator for each section. A minimum didn't like are petty, and as personal put arms. charge time of 14 hours is recom­ as the colors that I pick for my air­ HARNESSING mended, with 24 hours stated as planes, and have no bearing on the The receiver comes with two being the maximum safe time. Our operation or reliability of this system. three-section block connectors on tests showed a 47 mil rate for the For example, I am a thumb flyer, the end of four inch cables. One transmitter and 52 mils for the re­ and find that the plastic ends on the block provides for elevator, engine, ceiver batteries. These are con­ sticks are sharp and uncomfortable. and rudder servo connections, the sidered adequate and safe values, But before you start saying "Poor other for the aileron and auxiliary and are in following with the mini­ Baby", remember what I said earlier, channels. The second block also has mum and maximum times as stated. that if it is comfortable, it is right. pins protruding from it, which mate WARRANTY AND SERVICE The reverse is also true, if you are with the switch harness for power The Mathes system is warranted flying around with something dis­ connections. The switch harness dif­ for a period of 60 days from the date tracting you, you are doing it wrong. fers from many in that it does not of sale to the original owner. The I eliminated this particular distrac­ have a plug-in connection between warranty covers all the defects in tion by removing the slip-on plastic JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 73 properly, you need only concentrate on enjoying the flying. GENERAL The suggested retail price of this system is $400, on your choice of frequencies in the 27, 53, or 72 MHZ bands. You also have your choice of normal or Micro servos, and 500 or 225 MAH battery pack. A 180 degree Goldberg type retract gear servo is available at $45. Extra batteries, in either capacity, are $20, 'and a complete e*tra“airborne sys­ tem, tuned to your frequency is $250. Dollar-wise, this is not a “ Cheapie" R/C system. But then, it is not in that class quality-wise, either. Don Mathes has stated that his goal is not high volume production; the systems are virtually individually as­ sembled. The payoff is integrity, per­ formance, and eventual satisfaction. Airborne system weight is 11-1/4 ounces, including servo mounts, of which 4 ounces is the 500 MAH battery. The use of a 225, 400, or 450 mil battery will result in savings of from one to two ounces. Even with the larger battery, the weight is not excessive and is more or less average. The use of the Micro servos w ill result in another ounce or so being saved. I have yet to fly servos of that size, but there is bound to be some reduction in available torque. So for average use, and as long as space permits and the one ounce is ends and installing a set of metal is well made and is there for you. not critical, I am staying with the ends as used by Millcott Corporation My other dislike, more on the normal size servos. on the “ Specialist" transmitter. In order of a suggestion, is a bit more The stick-to-servo travel movement addition to what is a more com­ on the valid side. If you lay the was checked and measured, as I feel fortable feel, I gained the adjustable transmitter on its back, such as many this is an important test of general stick feature which can also con­ of us do when starting the engine, quality that any of us can carry out tribute to comfort and precision in you are going to get the back of it all and interpret. I found an average of flying. scratched. It needs rubber feet. 85 degrees servo movement, with These stick end pieces are de­ They've been installed on mine, and only a 6 degree variation from least signed for the same diameter rod as are available from Moses R/C Elec­ to most. Trim movement averaged is used in the installed gimbal, and tronics at four for $1, postpaid. out at 23 degrees, with 8 degrees will slip right on with no modifica­ FLYING variation least to most. tions. Length adjustment is made by A considerable amount of flying Most impressive, I found that in simply positioning the piece, and time has been accumulated on this moving one servo from channel-to- locking it in place with a twist of the system. All of it was done on one of channel, there was never over 3 top as the bottom piece is held. They Archaeoperyx Airframe's “ Safari" degrees change in center, and two of are available from Millcott (see ad) RTF birds, powered by one of the the channels differed by only one de­ for $4.25, postpaid. The only fly in new Enya 40X engines. This aircraft gree. This is indicative of the fact this particular ointment is that they being rather high off the ground, and that everybody along the way, in­ are only available in a gold anodized with the antenna running externally cluding the set-up technician, cared. finish to match the rest of their trans­ back to the top of the stab, the 50 Setting up radios is dull and boring, mitter. I decided I could give up the feet minimum ground range as stated nowhere near the challenge that "color coordinated" for the other in the manual was easily achieved. troubleshooting and repairing can be. features. Other types of installations and other To you, it means that you can The other thing I didn't like is of airplanes will doubtlessly differ move servos from one channel to an­ an even more inconsequential somewhat. The important thing is to other, such as you would want to do nature; the X&@&)#$ switch cover set a standard and to be wary if the if one developed a questionable on the transmitter. It is of the flip up range changes. condition and you want it in throttle, type, which remains up and gets in In flight, we gave it the works. Far with only the slightest re-trimming my way. Possibly it would bother us and low, antenna pointed directly at being necessary. Mode One flyers more, but I've it, turned on every transmitter on a I found the servos to have minimal never felt the need for such a gadget, different frequency that was at the dead center, with no trace of "ner­ and it was also taken off. It removes field. Through it all, control was solid vousness" or overshoot. Power and easily, and is just as easily replaced and reliable. speed are acceptable for all uses, with a 98# Kraft Switch Guard. But Generally, we feel safe in saying including Formula One. And while it if you like the type, the one installed that if you install it and preflight it hasn't yet, as it has been in a test

74 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER SAILPLANES LOVE ELECTRIC POWER

Yes, electric power and soaring are blissfully com­ patible; both are clean, quiet and lots of fun. Here is a perfect combination: • The high thrust Astro 05 electric power system. • The Super Monterey Sailplane, an improved version of the world-famous Monterey that features hands-off stability and an excellent floating glide. • The rapid charger that charges your electric system in just fifteen minutes from your auto battery. Now you can fly from that neighborhood field that is too small for a winch or high start. Fly electric! It's the neighborly thing to do. Available at your dealer now.

RSTRO f lig h t me PIONEERS IN SILENT FLIGHT

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plane, this one will soon see service the foregoing engines, in an attempt ship and could be found everywhere; in one of my Quarter Midgets, which to capture the car racing and boat even in the Western Auto Stores! is my way of saying without resorting trade. With the addition of a fly­ For the technically minded, the to TV commercial superlatives, that I wheel, prices jumped about three OK 49 featured a .900 bore (as did consider this to be a high quality and dollars on each engine. the 60 motors) with a stroke of .775. reliable system which I am not con­ The OK 49, which was simply a The OK timer consisted of a steel cerned about flying in an airplane destroked sixty, featured a three- trunion pin cast into the bracket. It that I built. piece welded crankshaft. The engine was claimed that by reaming the My type of flying does not require was clearly identified by the num­ breaker arm bushing to close toler­ roll and spin buttons (yeeck!) such as bers 49 stamped on the left lug on ances, point flutter was eliminated are found on other radios, but if you top. Outside of being a 1/4 inch over full speed range. ever get that "GO FASTER" button shorter than the Special, and a 1/2 circuitry perfected, Don, I want one!· inch shorter than tne Deluxe, it was Brebeck took out Patent No. difficult to quickly spot the differ­ 2,179,683 for crankcase and cylinder ence between the 49 and 60 motors. design, with the cylinder mounting Plug Sparks. . Continued from page 26 flange forming a separator between It was also about this time that the transfer and exhaust ports. With enough, if you wanted it inverted, the Herkimer Tool & Model Com­ transfer ports located below the this was $1.50 extra), followed by pany launched its intensive cam­ flange connection to the crankcase the Standard at $16.50, the Special paign of "A Snap to Start", indicating and the exhaust ports above, it was at $12.50 and the OK 49 at $12.50. the ease of starting its motors. The claimed this eliminated (or mini­ Almost a carbon copy of the Junior columnist owned three in his day mized) the expansion of the crank­ Motors Corp. of scaling prices on and found them fairly tractable. case cylinder extension, thereby their Brown Jr. models B, C, and D! However, with the spark lever slight­ eliminating leaks between cylinder Three-view drawings show the ly advanced, the engines developed and crankcase. This allowed the cleverness of the engineering at a mean streak and left their mark on cylinder to be machined from a solid Herkimer Tool & Model, as all ot the many an unwary finger. billet of steel, with no gaskets. Pis­ above engines had interchangeable Although OK engines were tons (ground and lapped) were parts. A commonality of this type generally accepted as pretty fair run­ machined from solid steel, hardened, allowed Brebeck to drop his prices ning engines, they never quite made ground, and finally lapped. The wrist so as to match Super Cyclone, which the big time as did Brown, Super pins were steel, hollow-drilled, with was then a strictly mail-order en­ Cyclone, and Ohlsson (incidentally, aluminum pads to prevent scoring. gine at a very competitive price. in that order of succession). OK en­ All engines were provided with trans­ To really round things out, the gines were a very much discussed lucent bakelite type tanks which Herkimer concern offered a Raceway engine, but one thing was certain, were impervious to all solvents such and Marine engine takeoff on each of they enjoyed an excellent distributor­ as gasoline, ether, benzol, alcohol. JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 75 Zap GOLD bonds in seconds! and now...you SEE it at work!

m Practically universal ■ Bonds: Wood · vinyl · metal · leather DID YOU • rubber · plastics · glass · china • similar and dissimilar materials ■ Save adhesive and get stronger bonds EVER WONDER • No waste through reapplication. You SEE the first drop go on! • Best bonds use the least adhesive. SEE WHAT how much you are using! YOU DID only $ ^ 9 5 "W 1/2 FL. OZ. LAST NIGHT ASK for ZAP GOLD at your hobby dealer!

Distributor Inquiries Invited. ■ KPACER » jr» n me 550 Dell Avenue / Campbell. CA 95008 V Á etc. old Flying Aces magazines. He has crews room. When off duty, and OK 49 motors were rated at 1/5 only one precious Flying Aces copy there was sufficient room in the horsepower turning at 6500 rpm. left (sob!). He has built replicas of hangar (when aircraft were out on Weight, complete with coil, con­ the 1936, 1937, 1938, and 1939 patrol), Vic would fly his models. denser, and tank was 11-1/4 ounces. Wakefield winners. Entered the That ought to be some sort of a Not bad for a complete assembly! United Kingdom Team Eliminations record, 1000 miles from the nearest One point worth noting in the in 1939 with a "streamliner". Even­ land! OK brochure on starting and running tually he did make the British team Hopefully, w e'll get some more of its engines is the interesting piece in 1954, for proxy flying in the USA stuff from Vic on how he was able of advice which could be applied to (Jerry Kolb, are you still there?). to come up with other modeling sup­ engines of today: "Use a good With this background in mind, Vic plies, such as rubber, covering, quality propeller weighing 1-1/4 to never completely gave up modeling, cement, etc. Sounds like fun! 1-3/4 ounces for breaking in the en­ even when in the Mid-Atlantic in 17th ANNUAL STOCKTON O/T gine. After break-in, select a pro­ 1943. At that time, he was serving It hardly seems possible to this peller of one to one-and-a-quarter with the 811 Squadron, Royal Navy, writer that seventeen years have ounce weight that is carefully bal­ aboard the carrier HMS Biter, for gone by so quickly. It only seems anced. The use of a propeller light convoy protection. The aircraft in use like eight or ten years ago, the first in weight will cause the engine to be then was the Fairey Swordfish (a old-timer contest was held at Sacra­ difficult to start due to lack of torpedo carrying plane). Occa­ mento. Man, is this Annual starting momentum to carry the piston past sionally, when the weather was bad, to get a few whiskers on it! compression. A light propeller will and particularly at night, every so Despite the cries that the colum­ also cause the engine to vibrate often, a Swordfish would go splat. nist is strictly O/T R/C oriented, excessively." The resultant ditching would ruin the this is one of the writer's favorite 30 YEARS AGO I WAS. . . undercarriage (landing gear in contests. Don't miss these very often! Looks like this little section of this Americanese). Before being scrapped Held on the same days as the Fresno column may get to be real popular, and heaved over the side, Dubery Annual, at the same site, an aston­ as fellows enjoy hearing about the would lay claim to the "step" in the ishing 81 entries were noted in the other guy and then recounting their vee of the leg struts. Underneath good weather. Quite a few models own experiences in the "good old the formed dural was a filler . . . you drifted off in the afternoon breeze, days". Here is the latest from Vic don't have to guess twice . . . balsa- and by the time the count got up to Dubery of England, an avid Model wood! This stuff was unobtainable 7 O/T models lost, an airplane was Builder reader (wouldn't have him since 1939! chartered to find the errant ones. any other way!). After laboriously making his own Imagine the surprise of the pilot Vic cut his aeromodelling teeth sheet and strip stock from the odd when he found a "downer" of an (now, there is a well turned phrase!) sized block, Vic built peanut-size area wherein there were 12 to 15 on Megow kits in 1935, and a lot of models while on standby in the models! Talk about making a profit! 76 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER (We're only kidding, as there were quite a few modern free flights out there from the joint Fresno Annual.) Because of the badly overcrowded old-timer contest schedule this year, the Annual North-South Contest was held in conjunction with the Stock- ton Annual. This gave the meet a little added spice. As usual, the AMPS (although outnumbering the southerners) lost to the SCAMPS and SCIFS by a rather lopsided score of 22 to 14. Maybe if "w e" eliminated Sal Taibi and a few of the other boys, the score might even out a bit. Something new was added to the Stockton Annual this year, with the inclusion of the First Annual Swap BOX 511D, HIGGINSVILLE, MISSOURI 64037 Meet. The Fresno Club handled most of the preparations (including the A special meeting was called by site). Although attendance wasn't John Pond, SAM V.P., inviting repre­ that great (Perssons was expecting a sentatives of SAM 21, 26, 27, 32, real heavy turnout in Fresno for a and 49 to attend. The primary reason mRc-suEum first-time thing), the swap meet for the meeting was to stress fewer 25cc (1.5 cu. in.) ENGINE turned out to be a good one, with and better contests rather than hav­ A Powerhouse To Flandle Your numerous items being traded and ing every club running off and stag­ "Biggest" Model sold. Next year should see a much ing a dozen poorly attended meets. heavier participation, as many of All clubs were in agreement with ■ Smooth running, low vibration those attending weren't exactly sure this idea, as it did not exclude any ■ Schneurle porting for high torque how this Swapfest would turn out, small get-togethers any of the indi­ ■ Easily swings 18" props let alone being held! vidual clubs might care to stage. Back to the flying saw Sunday After considerable discussion, the with a real day of thermals all over following months were assigned, the place. Class A turned out to be with the individual clubs to come up the real dog-eat-dog event, with son with suitable non-conflicting dates Greg nosing out dad, Al Rasmussen, with other O/T F/F activities (wher­ both at 20:00 mark. )im Persson beat ever possible): Larry Boyer's good time of 14:21 February SAM 27 with 16:04 for third. The competition March SAM 30 was alive! April SAM 21 Texaco (Taft) Other winners featured Abe Gallas May SAM 21 .020 Annual again winning .020 Replica, Larry Memorial Day 5 Boyer topping the field of 30 Second Club Meet Antique Models, Jim Adams copping June SAM 49 Class B, while Chris Christenson, of July SAM 27 Bakersfield, won Class C. In old-time September SAM 21 rubber, Bill Langenberg easily out­ Oct. 14-15 SAM 26 distanced all others with a 20 minute Pond Commemorative flight total. Interestingly enough, November SAM 30 Charlie Werle pulled a fourth place December SAM 49 Texaco (Taft) with one out-of-sight flight with his All clubs are to notify the Chair­ Schmaedig Twin Pusher. Beginning man (Pond) as to dates so that they MRC@ to see more and more of these old- may be properly publicized. time pushers. They do fly well! MEMORIAL DAY O/T R/C ANNUAL MODEL RECTIFIER CORPORATION Full credit for promotion of the As part of the business being 2S00 W oodbridge Avenue «E d iso n . N J 08817 meet and the tremendous trophies conducted at the Santa Maria meet­ and merchandise should go to Russ ing, the idea of a three-day Old Time duties would consist of field pro­ James, of Fresno, for his tremendous F/F Radio Control meet was brought curement (in the Fresno area), ar­ PR work. His tireless efforts really up by the columnist. As originally rangement of block motel reserva­ paid off and those who skipped this suggested by Otto Bernhardt, this tions, publicity, prize arrangements, meet have only themselves to blame date appears to be the best avail­ field facilities, you name it! for missing out on all the loot! See able. Some objections arose as it was you next year on the last weekend of felt some old-timer flyers would be No Contest Director was named, September. unable to attend O/T functions at the but it appears the columnist may WESTERN OLD-TIMER U.S. Free Flight Champs and this inherit it by default, unless an eager F/F R/C ASSN. proposed O/T R/C meet. It was volunteer can be found. We'll carry For lack of a better name, this will pointed out that the majority of the more on this in future columns. do until some bright lad thinks of members of all clubs do not attend Tentatively, events would shape one. But regardless of a name, some­ the USFFC; hence, there would be up something like this, spread over thing like this was bound to happen, no conflict of interests. three days: Glow events, Class A, B, with the formation of the So. Cal. Upon the recommendation of the and C, Ignition events, Class AB Club, the 49ers, making the fifth O/T chair, Russ James, of Fresno, was combined and C, Antique, Texaco, R/C Club in California. appointed Contest Manager. His and .020. Looks like a full schedule

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 77 Jenkins goes on to say the CIA * # (Central Indiana Aeromodellers) meet MODEL BUILDER PRODUCTS held at Wright Patterson Air Force BASS ULTIMATE AIRBRUSH Base was "blessed" with Bong AFB type winds. As also noted by Harry FEATURES: Murphy, Editor of the CIA Informer, • Molded Delrin Body quite a few models bit the dust in • Contoured To Fit the high winds. However, "Murf" The H and sez WP AFB is still large enough for • Fingertip A ir Valve two-minute flights no matter what • Improved Hose the wind. Great stuff! Just what was L o ca tio n needed in this area . . . a flying field! • No Pressure Build-up Noted was the flyaway by Buck • Easy To Clean Zehr's Playboy, witn a full tank of • Accessories and Parts gas. The model went into the over­ A vailable cast, still snorting, because of an inactivated timer. The D-T timer • Sprays: Dopes must have been set for a minute Lacquers. Acrylics, and a half as the motor ran for 1:48, Epoxies, Enamels resulting in the darndest spin you • Includes medium tip. would ever want to see! Model Large & small tips landed about a mile downwind with available, $6.45 ea. very little damage. How lucky can • Compresser adapter you get! 11/4" Std.l with 8' Compare that with Harry Murphy heavyweight hose, ruining his Demon on a crosswind $4.00. launch. Another cartwheeling model, The BASS Airbrush is an external-mix, precision instrument that sprays a John Peck's Playboy, was another variable pattern from 1/16 to 2 inches wide. "lucky" with John taking bids on his "two piece" wing. (This is a direct SPECIAL INTRODUCTORY OFFER, includes shipping *36.- and handling quote from Harry Murphy.) Jenkins' boy, Don Jr., had the boys California residents add 6% sales tax. Dealer inquiries invited. uessing for quite awhile as to what ind of old-timer he had when first MODEL BUILDER PRODUCTS putting his Air Warden on the flight 621 West Nineteenth St., Costa Mesa, California 92627 line. As some wags said, it looked like a Buccaneer with a gland condition. for the biggest "hot dog" of all. loop a Foo. By the way, as a side Results, as appearing in the In­ FLORIDA FUN note, Bryton Barron went into the former, show Bill Hale winning Class Terry Rimert reports as a follow-on hospital for a checkup, and they kept A-B O/T and Bob Larsh copping to the George Perryman episode at him there. The hospital personnel is Class C. In closing off his com­ the O/T Nats Dinner, that George is still trying to figure out why he is mentary, Murphy looks for a real almost over the shock of the Muivi- in such good shape. Easy! Fly Old renaissance in free flight now that hill Trophy award presentation. To Timers! the Central Ohio Free Flight Club keep him in line, Terry has put a Looks like the Jim Kloth Memorial has been successful in obtaining the bounty on him. Sez this w ill keep may be renamed the McNeill Bene­ use of Wright-Patterson AFB. Maybe George from getting the big head. To fit, as Jim ran off with half of the we'll even get a SAM Chapter going! further sweeten the pot, Rimert is loot. Terry sez he pulls models out of EAST COAST giving extra prizes for anyone who his car trunk and puts them up like OLD TIMER CHAMPIONSHIPS beats George. Now that's getting to they have been flown before and The SAM 7 "Yankee" newsletter be rough competition! completely trimmed out. Everyone didn't carry very much on their Reports on the Jim Kloth Memorial knows that's against the rules! Haw! highly successful East Coast O/T O/T and Turkey Fliers Contest at Might even disqualify him! Championships held at Wendover Pensacola suffered from lack of en­ Other winners were McGloughlan AFB. The Champs enjoyed one of the tries. Same old problem, if you don't in O/T Pylon, Sharpton and Ralph best days ever seen for flying. About advertise, the modelers don't know Jolbert in .020 Replica. The rest the only wind noticeable was some about your meet! Truly a shame, as McNeill got! To round off a great later afternoon shifts. In short, condi­ Jim Kloth is well worth remembering contest, Caroline Kloth came over to tions were superb and practically for all his activities in Florida help out with the officiating and to every model had a good flight! modeling. award the prizes. How appropriate About the only contestant who "A nyw ay," sez Terry, "I had a an end to a very promising contest! has not come down to earth yet is smashing good time. My Playboy is MIDWEST ANTICS Bob Bissett, of Baltimore, who won now doing better loops than it was Received a most informative letter the Wahl-Brown Jr. custom engine so at Riverside. More spectacular when from Don Jenkins, of Indianapolis, generously donated by Herb Wahl. it crashes!" Between running, bust­ who writes to say the 15th Old Bob worked hard to get it, as the ing an Orbitier into an antenna wire, Timer Bash at Bong came off on competition was pretty fierce. and powdering his .020 Replica Foo, September 11 with everyone having To sum up the SAM 7 News­ Terry had a great time. a great time. letter, this year has been excellent Ron Sharpton, not to be outdone, Bob Larsh finally lost his 15-year- for flying, and believe it or not, no borrowed Terry's hot fuel after over­ old Brooklyn Dodger in the usual contests had rain! Attendance was hauling his ignition system, and pro­ Bong wind. No results, but Tim always over 65 individual entries. ceeded to show Terry how to really Banaszak sez it was a good meet. Everything was lovely! As the SAM 7 78 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER Club puts it: "Flying with SAM 7 is flying for Fun and Enjoyment" Couldn't have put it better myself! “ Midwest DECALS, DECALS! Not content with his previous of­ fering of re-created old-timer engine Micro-Cut decals, Larry Vance, of 5066 Cindy Lane, Las Vegas, Nevada 89102, has Balsa... now produced several more sheets of assorted old decals. Old Timer modelers will be par­ it’s the better ticularly pleased to see the old Academy of Model Aeronautics de­ cal with the center circle of NAA. scratch-builders’ Of course, to properly decorate your model indicating the engine, Larry offers decals of Dooling, Phantom balsa·’ P-30, McCoy, Drone, Bunch, Ohls­ When Ralph DeFalco of Oak Lawn, Illinois, began work on the model he’s son 23, K&B Torpedo, and even for always wanted to build, he built with the rubber fans, "T-56 powered!" Midwest Micro-Cut Balsa. How about that? That’s because Midwest balsa builds Vance has gone to considerable with less hassle, fewer problems. Mid­ trouble and investigation to make west Micro-Cut is all straight grained, them exact in size, coloring, and pre-sanded to a .002 tolerance satin smooth finish and then inspected three type lettering. For the fastidious times. And Midwest balsa is available in modeler, these decals are best a wide range of sizes. quality, will lay flat, will not crack, So when you’re ready to build the and with proper application, can be model you’ve always wanted to build, fuel proofed. go with Midwest Micro-Cut Balsa, "the The set of decals (now available!) better scratch-builder’s balsa.” sell for $7.50 postpaid. Before you Midwest Products Company back off on the price, this includes 400 South Indiana Street 23 varieties on six sheets. Actually, Hobart, Indiana 46342 you receive two sheets of each style. Worth noting the price is now a 50% reduction over the first set offered some time back. You won't be sorry if you order them, as the columnist was more than pleased at the beautiful repro­ ductions. Gettum while they're hot! THE WRAP UP Almost missed it in the Nats News put out by Les Hard, Editor at River­ side AFB during the Nationals. This could so easily apply to old-timers and in particular old-timer FF radio controlled, that it isn't funny. Try these rules that were the actual regu­ lations governing the operation of full scale aircraft in the early 1920 era. Ralph DeFalco, RC 1. Don't take the machine into the model airplane enthusiast air unless you are satisfied it will fly. and his scratch-built, 1”— Γ, 2. Pilots should carry hankies in a stand off scale P-61 Black Widow. handy position to wipe off the main point is to be safe whenever Since the wing is tapered in every goggles. you fly. Let's not be stuffing our possible direction, a wing jig is neces­ 3. In case the engine fails on take­ models into the parked car area! sary to insure alignment. A simple off, land straight ahead regardless of We're having fun; let's keep it that temporary jig can be put together as obstacles. way!! · shown in the photo. The spars are 4. No machine must taxi faster assembled over the plan to obtain the than a man can walk. M adm an...... Continued from page 29 proper dihedral and thickness taper. 5. If you see another machine near you, get out of its way. available, the fuselage can be straight­ The spar assembly is then lashed to 6. Do not trust altitude instru­ ened out as on the original Madman. the upright blocks on the jig, using ments. Other than this, the Madman is an rubber bands. The ribs and trailing 7. Pilots will not wear spurs when exact reduction and was scaled photo- edges are aligned, and the entire wing flying (How about that one!). graphically. Ordinary materials are is glued up at one time. Zap, or 8. If an emergency occurs while used throughout, as in the kit version. equivalent, is good for this, since the flying, land as soon as you can. So you don't have to send away for adhesive is applied to the outside of (You're telling me!) fiberglass or foam parts in order to get each joint without disturbing the Ridiculous and absurd as some of started. alignment. After adding the leading the old regulations seem to be, the CONSTRUCTION edge, remove the wing from the jig

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 79 for clearance and freedom from bind­ “SERIES 50” ing, add the fuselage bottom planking and the built-up turtledeck. OLD TIMER R/C Leather fillets were supplied in the .09 .15 3 CHANNEL Madman kit. These are again available in hobby shops, and are superior to SPORT FLYING the usual putty fillets because they are AT ITS BEST not messy, require no sanding, and $31.50 will not crack out. The Tee Dee 049 should be set up 50" SPAN for pressure operation. With previous 380 SQ. IN models, I have found that a non­ 32 38 02. pressure system using a 2 oz. tank is PRE CUT PARTS- unreliable. In order to clear the cowl­ FORMED LANDING GEAR ing, a 90° elbow made from brass PARTIAL HAROWARE tubing should be epoxied to the crank­ $33.50 shaft pressure fitting. Note that the CAL AERO-MODEL 7142 BLUESAILS DRIVE. HUNTINGTON BEACH. CALIFORNIA 92647 TD does not have the pressure line drilled clear through the crankcase. Follow the manufacturer's instructions Begin by cutting the fuselage sides when drilling the crankcase. from medium 3/32 sheet. Epoxy or The wing structure is quite strong, contact-cement the ply doublers to the and does not depend on silk or silk- sides and assemble the fuselage up­ span tissue covering for strength. Plas­ side down on a true surface by using tic films may be used, but I chose GET A HEAD! the firewall, FI and former F3 for the classic silkspan and dope finish Dieselize Your Cox Engine alignment. The T-nuts for the engine to be authentic with the period. The mount should be installed on the tire- wings and tail surfaces are tissue • No Glow plugs • More* Power wall before assembly. The firewall is covered and the finish is built up with • No Battery & l>*ads • More economy set so there is no engine offset. Add talc mixed with Aero Gloss clear. The • Kasiiy throttled the braces to the fuselage sides aft of paint scheme matches the original • Ivess noitie the cockpit area and bring the rear to­ Yates Madman and is overall light blue gether at the tail post. Next, add former with dark blue trim and black striping. F2, the servo rails and the stabilizer The AMA numbers on Yates' Madman platform. The engine should be trial fit are gold decals outlined in black. at this time. Glue in the blocks for These are no longer available, so I had the cowling and the ply spinner ring, to settle for the pressure-sensitive type. after adjusting the length of the cowl­ FLYING ing blocks to provide about 1 mm The newcomer to 1/2A ships of this clearance between the spinner back- type will require some psychological plate and the spinner ring. Save the orientation. Although not faster than carving on the cowling until after the larger pattern planes, the apparent Convention in »econds. No tool« required. wing and fuselage bottom pieces have speed is greater because of the smaller Available for .020 and .049/.051. been added. size. Depth perception is also af­ INTRODUCTORY PRICE $9.95 The completed wing should be in­ fected, especially if you regularly fly include» W pi. o f fuel. stalled after the stabilizer and fin. larger models. These difficulties will A »k your dealer or add $1.50 n&h It is likely that the wing cutouts in disappear after a little practice, hut To order direct. (Conn. Res. add S.T.) the fuselage will not be exactly true, so first flights should be high and cau­ the stabilizer provides a good refer­ tious. The hand launch is the only Send SASK for literature. ence for alignment of the wing. After practical method of taking off, since Dealer inquire» invited the wing is installed, some of the this model is a tail-dragger with poor leading edge planking will have to be directional control on the ground. Davis Diesel Development Inc. cut away for installation of the landing Needless to say, ground looping is a Box 141, Milford, Conn. 06460 (203)877-1670 gear bulkhead. Sew the gear wire to problem with this configuration. DEPT. MB the bulkhead with carpet thread or Launch smoothly straight ahead and copper wire and epoxy this into the avoid massive control inputs until and install the planking. Tack glue slot in Rib No. 1. The ply faces on altitude and speed are reached. the wing tip blocks in place. After Rib No. 1 carry the landing gear loads With a 225 MAH battery pack, my carving and sanding, they are re­ back to the spars. Some additional model weighed in at 21 oz. No bal­ moved and hollowed. reinforcing may be added in the form last was required to trim to the CG of glass cloth or blocks, if desired. shown on the plans. Initial flights The tail group on the original Mad­ The gear wire is lighter than normal could carry a slightly more forward man was carved from thick balsa sheet to act as a spring shock absorber. CG, for safety. As flight experience is and the same procedure is used here, The radio and pushrods should be gained, the CG can be moved back except that the center portions are cut added while the fuselage is still open. until the model is able to snap roll out and sheet balsa ribs are substituted The 2-channel brick radio is mounted smartly with full rudder and elevator. to save weight. After tapering the to the hardwood rails that have been For better roll performance, you blanks linearly to 1/8 at the tips, epoxied across the fuselage and to might consider substitution of strip sand to a symmetrical airfoil shape. former F2. You may choose to install ailerons for the rudder. However, Then cut out the centers where shown. Nyrods, but 3/16 square hard balsa this is a scale model, in a sense. So The fuselage structure is a simple wrapped with tissue and doped would ailerons just would not be authentic. box, with embellishments added here serve, since the pushrods are straight. My object was to exactly duplicate and there to give it a pleasing shape. When the controls have been checked the classic Madman in the 1/2A for- 80 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER mat. What resulted is a tine looking model that is fast, responsive, and great fun to fly. AILERON CONNECTOR & DUAL ACKNOWLEDGEMENTS I would like to thank Mr. J.C. Yates, Mr. Bob Palmer, and Mr. J.A. Miske, TAKE-OFF BALL LIN K 5-Piece set (No. 183) includes 2-way for their contributions of historical nylon link, 2 threaded couplers. and documentary information. · 1 steel ball with pin and washer for peening assembly securely onto servo arm. For fast equal Stand...... Continued from page 33 trim adjustments just "snap-off' nylon link, twist in desired The base is longer than the size of direction and "snap" back on. the box, both front and rear. The front EASY I Also great for rudder- part acts as a leg out front, to keep the nosewheel and elevator-brake whole thing from tipping over when hookups. Only $1 .00 called upon to hold that new 1/4-Scale powerplant. The back leg, shorter, has a hole through which a screwdriver or large nail can be inserted into the AILERON HORN W IF ^ ground for added anchorage. Maybe DU-BRO BALL LIN KS you won't need either one, but it is PRODUCTS better to be safe than sorry. One coat Excellent hook up of K & B polyester resin overall, INC. assembly for strip ailerons. effectively fuelproofs the base forever. 480 BONNER ROAD *1 Eliminates differential throw WAUCONDA, ILL. We have found this MRC/IM No. 189...2 Sets $ 1 .7 5 Products Engine Test Stand a worth­ 60084 M while addition to our support equip­ ment. It allows us to safely and conveniently break-in, test, and 4. Keep hands away from prop as otherwise run our engines. If the much as possible; use "chicken stick" $34.95 selling price is considered as device or electric starter; follow too high for your individual budget, it instructions supplied with device. certainly isn't too high for a team or 5. Keep face and body away from TEST BEIIIH & ŠTÁBO club purchase. In fact, an ideal set-up path of prop as you start and run Makes Breaking In An Engine would be a permanent installation at engine. Safe, Reliable, Simple the club field, with a waterproof box or 6. Make all engine adjustments ■ Sturdy all metal bench and from behind rotating prop. even a plastic cover to protect it from test stand the weather. (Also a burglar alarm! wen) 7. To stop engine, cut off fuel sup­ ■ Complete with adjustable And for those of you in the “ with ply or follow engine manufacturer's enough power, anything will fly” directions. DON'T use hands, fingers, engine mount, locking throt­ school of thought, remember that it or any part of body. DON'T throw tle, lever and 33 oz. fuel tank will probably take a lot of elevator just anything into a running engine. ■ Pre-drilled stand to get it to rotate. . . 8. Discard any props with nicks, This is an appropriate time and scratches, splits or cracks or any sign location to publish the Standards and of wear or damage. Never repair, Warnings with respect to using pro­ alter, shave or bend a prop! Normal pellers safely and properly. These engine vibration can loosen a prop; standards were developed in coopera­ inspect and retighten if necessary! tion with propeller, model engine, and ADDITIONAL PRECAUTIONS kit manufacturers, and were compiled A. Use safety glasses when starting \ and published by Top Flite Models. or running engine. MRC includes a set of these Standards B. Don't run engine in area of \ along with its Engine Test Stand loose gravel or sand; prop may throw Instructions. such materials in face or eyes. C. KEEP AWAY FROM PROP: Loose clothing, shirt sleeves, ties, Under INSTRUCTIONS AND WARNING scarfs or loose objects (pencils, $34.95 Retail SHEET — HOW TO USE screwdrivers) that may fall out of shirt PROPELLERS SAFELY & PROPERLY or jacket pockets into prop. The failure to read and follow in­ D. Make certain glow plug clip or structions, abuse or misuse, may re­ connector is secure so that it will not sult in serious personal injury! pop off or otherwise get into running 1. For correct propeller size and prop. MODEL RECTIFIER CORPORATION pitch, follow advise of engine manu­ E. If a spinner is used, be certain 2500 Woodbndge Avenue »Edison. N.J. 08817 facture or prop chart available free its edges do not touch the prop blades. from dealer or Top Flite. ADDITIONAL SPECIAL WARNINGS as follows: 2. Install prop with curved side AND INSTRUCTIONS FOR 1. Boil each propeller in water for facing you. Securely tighten propeller NYLON PROPELLERS 30 minutes before first use. Water nut; use correct wrench for this Nylon props are affected by should cover the entire prop. Do not purpose. amount of moisture in the air and will cover pot. Let prop stay in water until 3. When starting engine, keep become brittle and break if too dry. cool. spectators away (20 feet or more) Since amount of moisture may vary 2. You can add dye (Rit, etc.) in and out of path of rotating prop. greatly from time of manufacture, do the water to identify boiled props as

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 81 ably because of the low center of APPLIED DESIGN TORP. 738 PENN STREET S t a v = T F å v $198 gravity. EL SECUNIX). CA WM This was a fun project from the start, KEEP EVERYTHING MINI o - SANDER and I doubt that anyone who builds IN PLACE-NEATLY one of these models will be dis­ ADJUSTABLE TENSION HAND BELT SANDER Th.i iroiciod plastic yyo«k oigamtar satisfied with the kit or the model's FIRMLY HOLDS PAPER i i «V ·» ■<$«·· to kMp looii «od pa

M IN I STRIPS PRECISION OIE CUT U N ium U>««t MINI SAW $3.95 SAVESTIME λ λ . REPLACEMENT FuwOatfwl AND EFFORT Ύ Ύ ζ SANOING BELTS. A m

SAWS ANYTHING. ANYWHERE

M IN I GLUE TIPS fugged die cat· llama with time in a most relaxed attitude. coitdofUbl«. chip-proof |rf*ti>c imat MAKES ANY GLUE TUBE handl« ««ceding no»· «nd *d|ui1«»)W Trouble is, flying like this fails to con­ A N ·*INSTAIVT GLUE GUN". 6 " Marts groet good work acorn Cull Mood. plaitic. m»t»l. and HARDENED vince any spectator that it's a difficult PUT THE GLUE WHERE u o r .ic IV lR f YOU WANT IT1 ^ art. • For those of you who take model • No *ιλ » lo Ml MINI - SAW BLADES ai« 99< photography seriously, may I suggest • No n**»» lo cl**« 4 lot 99c FINE TOOTH REPLACEMENT HACK SAW BLAOES (6 inch) that you look into some equipment TEMPERED 10« ndting HAROENEO MUSIC WIRE now available from Burleigh Brooks Optics, Inc., Hackensack, New Jersey. They offer the Novoflex Auto-Macro ))) The MODEL ROCKET ENGINES of the FUTURE ((( Outfit for use with 35mm cameras. Here you can move in on your subject I MORE POWER and efficient u*e of that power for down to eight inches. They also offer straightcr, higher altitude flights. a Squeeze-to-Focus Pistol Grip and Close Focusing Bellows, adapted to your camera, with a rifle stock outfit FIOO-8 Y b° ' which consists of a metal rifle stock, ° * o . s forward trigger handle, and cable release. With this equipment, you can go Send, $1.00 for catalog of our entire into action as the aircraft maneuvers line of model rocketry products. overhead. It provides accurate sighting Flight System·, Inc. and focusing and facilitates tracking Dept. B 4 through their unique Trigger-Focus 9300 East 68th Strsst feature. You sight through your ition Raytown, Missouri 64133 I ’ NAR camera as you hold the ligntweight unit with both hands, and shoot from the shoulder. One hand triggers the against unboiled. comes out a little over the 32 ounce lens head forward and back for instant 3. After use of prop, remove from maximum weight shown on the plan. If engine, wrap in moist cloth, paper you don't tell your plane, it'll never focusing from closeup to infinity. The towel or rag and store in a water­ know the difference! other hand triggers a rapid shutter- tight plastic bag. release connection to your camera. • The Bull Pup is really a fun little They offer a choice of 600, 400, or ship to fly. The O.S. 10 is plenty of 280mm interchangeable, color-cor­ power for it, even though the ads say rected lenses. Bull Pup...... Continued from page 31 .09 to .15. With limited control sur­ Lloyd Standley of the Torrey Pines or anywhere else. A quick call to Tom face deflection, the airplane is docile Gulls enjoys his Beaver (although the Williams of Craft-Air confirmed it; and would make a great trainer. With pilot in his cockpit looks more like a mouse to me). This plane, produced the balance point was left off the plan full back stick, it just sort of mushes by Pilot, weighs only 1 7-1/2 ozs., with by mistake. All of the Bull Pup plans along and refuses to break into a stall, 44-inch span in the glider version. sti 11 at the factory have had the balance thanks to the flat bottom airfoil and This produces a 9 oz. per square foot point added with a rubber stamp, but the use of washout to prevent tip wing load. Lloyd increases the rudder there is still a number of kits in the stalling. Don't neglect the washout; area to provide more positive control. hobby shops that were shipped before it's important for safe, slow-speed The craft flies well and provides loads the mistake was discovered. For those flight. who happen to get one of these, the Increasing the control surface de­ of fun. correct balance point is on the spar. flection makes the model surprisingly Rocket City Industries now offers a My model weighs 36 ounces ready aerobatic for an airplane that doesn't releaseable towhook which can be to fly, which is four ounces over the have ailerons. It will loop, of course, mounted inboard of the fuselage. They maximum weight listed on the plans but it will also do some of the best suggest cutting a 1/4-inch slot, then (no doubt due to the heavy radio). rudder rolls I've seen, and in a spin it mounting this plastic device so there is With a wing area of 269 square inches, winds up like a runaway Maytag! The no protrusion. This is particularly this translates to a wing loading of ground handling is excellent, and appropriate for scale models. The re­ slightly over 19 ounces per square there is none of the ground looping lease lever is inclined 15 degrees for­ foot. Not real light, but then it's not tendency that a model with conven­ ward, and has been tested up to 72 really heavy either. The extra weight tional landing gear is supposed to pounds load. A simple servo connec­ doesn't seem to have any bad effects have. In fact, the Bull Pup is more tion is all that's required. In the lock on the airplane's performance, so stable on the ground than some of position, the towhook takes a special don't be concerned if your model the trike-geared ships I've seen, prob­ long thin winch ring which can be

82 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER attached to the usual circular ring. A support servo can be used, or the con­ W rite For trol wire can be coupled to the spoiler FREE BROCHURE or elevator servos. For example, full On Our Complete Line Of spoiler extended or down of the ele­ vator servo could be made to trigger R/C PROPORTIONAL EQUIPMENT the release. I expect we'll be seeing including quite a number of these in the near future. While talking with Phil Kraft, of WORLD'S SMALLEST SUPERLIGHT Kraft Radio Systems, the other day, he mentioned that we might go for a ride DIGITAL CONTROL SYSTEMS in his Fournier full-scale powered SMALLEST SIZES (PLEASE SEND AIRMAIL p o s t a g e ) lo w e s t PRICES sailplane. I didn't let that remark slide by, and so last Saturday. . . 13400-26 Saticoy Street You unfold the wings, crank up the North Hollywood, Calif 91605 Volkswagen engine, and leave the ground at very slow speed. We circled Phone (213) 764-1488 at a thousand feet, climbed to 3,000, changed the trim, and cruised down the coastline from Oceanside to FLYING SCALE MODELS NEW Torrey Pines. Turning inland, he cut PLANS the engine, and the silence was golden. Very few thermals, so we sank at about 100 feet per minute. He dived AIKCKHIXKK to assist engine start-up and we re­ 65' MNG SPAN r - V SCALE turned to Oceanside for a perfect PLANS (2 SWTS. 7 X ST 4 dead-stick landing. It was fun to watch >ί >:ιμ;μιι«; PATTSEE PATTERNS 9100 80” WING SPAN Γ - ť SCALE Phil adjust the final approach with SPARROW HAWK F9C-2 (3 sheets)...... S11.50 PLANS (2 SWTS. 7 X 5 1 S1S00 the spoilers. 13/4" scale C/L. 44-1/2 " span PATTSEE PATTERNS S&00 i :k ASH CURTISS HAWK P6E 13 sheets)...... S14.50 CHAR It SWITCH That flight gave me renewed inter­ 2” scale R/C. 63” span PLAN 1ST SI OQ SENO S A S E DEALERS INQUIRIES INVTTED FOR 0 T F/F AMO ALL ELECTRIC est in scale. I've now had sufficient GRUMMAN J2F-6 "DUCK” (4 sheets)...... $19.50 MODELS & 0 & SENO FOR INFO. 1-1/2” scale R/C, 58” span MAKE CHECKS 0« MONEY 0KOERS PAYMLE stick time on my 1/4 scale Kestrel 17 LOCKHEED P 38 (2 sheets)...... $12.50 TO: to report that it handles easily in spite 1” scale C/L, 52” span of its remarkable size (14 foot span) Price includes m ailing tube and postage. PAS-At-LO Brochure and additional info., send 50d PIERCE & SONS MODEL CO. and speed. There is a slight pitch down SMITH PLANS 2&2S0 1S3R0S.L as the spoilers are actuated, and a Box 8, Snowmass. Colorado 81654 KENT. WASHINGTON 98031 pitch up when you drop the flaps. I must remember to drop the wheel be­ links on my cars. I do this because I giving you more front bite than you fore landing and to flare so as to im- am still learning about the handling of need or want in the turns. If you're act with only the eight pounds this these cars and like to experiment with a brodie freak, run foamies in front, Eird weighs. The roll-out is brief and toe-in, toe-out, plus being able to ad­ otherwise stick with stock rubber. beautiful. In flight you can't tell that just centering easily. With the ball At the '77 ROAR Nationals, when it's not full scale. For this reason, it links and/or nylon clevises, each ad­ the bite started to come in pretty takes concentration to judge the justment can be made in controlled well, Bob started to notice a bit of range. and very small amounts, something straight-line instability creeping into I've also learned the great im­ that the stock wire pieces do not offer. his cars. This was traced to the tripod- portance of a clean radio installation Bob sets the toe-in on his cars using mounted JoMac radio shifting slightly . . . especially when there are six the infamous eyeball method, and due on the chassis. As the radio would servos. It's crucial to keep the receiver to his experience, gets away with it. shift, slight steering inputs would be as far as possible from the servos and You probably can too, as the MRP made. Due to the amount of traction extend the antenna away from those chassis plate sides are parallel, pro­ at the Nationals, any steering input "troublemakers." I'm using a 1000 viding a reference line to judge toe-in. showed up where previously this mah battery pack for extra insurance. For those with rulers and a con­ problem had not been noticeable. A Can't be too careful about this beau­ science, Bob likes to have 1/16 to temporary fix was to shove paper tiful bird. · 3/32 toe-in on his cars. Whatever wedges in between the radio and the works for you is what you should use. inboard ends of the A-arms. This held R/C Auto .... Continued from page 45 After lots of running, the six-spoke the radio more securely and elim i­ front wheels, even though they are nated the problem. Since then, Bob get brittle (work-hardened) and break. bushed, will wear and get a bit sloppy has changed the tool used in making I suppose it is only fair to mention on the axle. Don't worry about it. the chassis plates and the radio fits that I have only had this happen on a Front rubber used is stock stuff, narrow snugfy (noř tightly) between the Jerobee electric R/C car that has many, though they may appear to be. A little A-arms. If you have an earlier chassis' many hours of running on it. Due to running time to get mold lines scuffed and run on a good bite track, try this their ease of operation, the electrics off, and they are the hot tip. I have trick. If most of your racing is done simply get run to death. You'd have seen guys chuck a front wheel/tire on grease-pit tracks, forget it. to be a real fanatic to run a gas car assembly in a lathe and scuff the tire One of the great points of discussion as much as an electric car. Still, the down, but it doesn't seem to be worth in R/C car circles is on the subject steering link is a nickel 'n dime item the trouble. of how to go about getting more that I feel ought to be replaced occa­ Running a set of wide foam tires understeer or less understeer. Notice sionally, just to be on the safe side. on the front may seem like the way that we aren't going to talk about Even though Bob prefers the stock to go, but they only make the car a understeer or oversteer. A full-sized wire linkage, I continue to use ball little unstable on the straights, plus car with oversteer can be a bit of a

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 83 won't be long before you know what works for your car and track surface. Products By Perfectionists! The most important thing to re­ m ic r q Y4 member, and the bottom line on this Shown in Photo: bit about changing spring rates, is to be Waco-Scale! aware of the fact that spring rates do in Red affect handling, and that your car ★ 5 Easy Built Semi-Scale Kits! PC-6 Porter Semi-Scale! should be set up to match your own in mint Green driving style to the particular track on ★ 8 Peanut Scale Kits! Farman Peanut Scale! which you are running. ★ 5 Scale Kits! in Bright Orange Last thing concerning the front end, is caster. In stock condition, the MRP ★ Plan Service! Sherry! has no caster, the king pin being up­ ★ Strips '/32 sq., y20 sq., ’/16 sq Perfect Scale right in relation to the cnassis plate. It in Jet Black and Fine Wood Sheets! has been found that by raking the king pin back 5- to 10-degrees the car is ★ Over 20 sizes of more stable in a straight line. The High Torque Rubber! added caster does not seem to make any difference in the turns, although it would seem logical that the car would be easier to get pointed straight when exiting a turn. At Your Dealer or Direct To get the caster, Bob simply clamps Send for Catalog 75C the A-arm assemblies in a vise and twists in the amount of caster he Micro-X-Products Remember ... You Owe it to Yourself to P. O. Box 1063-A wants. Sounds crude, but he does it Lorain, Ohio 44055 own the Finest Flying Models! this way for a reason. If the caster is put in by shimming with washers between worked to produce the desired steer­ the base of the A-arm and the chassis Superior Aircraft ing. Trying to hash this out was great plate, the chassis plate is pre-loaded. fun and made a dynamite tape that is Not only do the mounting screws go Materials really fun to listen to (Welch and I through the plate at an angle, but the are planning to play it over the JoMac washers themselves put a pre-load on intercom system some day). However, the chassis. By twisting the A-arm, it we didn't come to a concrete con­ still mounts flat to the plate while clusion. giving the required caster. But that's OK, as the important Another solution is to face off the thing is to know that changing front base of the A-arm at the 5- to 10- spring rates will have a definite effect degree angle on a lathe. What I per­ BALSA WOOD, HARDWOOD, PLYWOOD on the amount of understeer your car sonally do is to use Sterling Models has. To soften the spring rates, simply nylon thrust wedges (stock No. 105). Master Charge · Bank Americard accepted cut a coil or two out of the spring Tnese little wedges are molded in 1,2 Box 8082, Long Beach. CA 90808 and reinstall it. To harden the springs, and 3 degrees increments and are just slip a washer or two under tne normally used for making thrust ad­ MIKE TAIBI Bus· (213> 865-3220 "E " ring and on top of the spring. justments on model airplanes. I stack a OWNER Res. (213) 421-3935 Do not simply stretch the springs. 2 and 3 degree wedge one on top of They'll just get sacked out, putting the other and underneath the A-arm. handful, especially something like a you right back where you were ini­ An advantage to using these wedges is Porsche that is capable of quickly tially, plus it is difficult to stretch that the amount of caster is known, going from understeer to oversteer in the springs to exactly the stiffness making caster changes more meaning­ a hard corner taken at racing speeds. you want. With the washers doing the ful when experimenting. Also, the stiffening, much more consistent re­ amount of caster can easily be In an R/C car, true oversteer is an sults can be obtained. When going changed at the track. impossible situation due to the fact out to practice, just take a bunch of Either in cranking caster with the that you are not actually in the car new springs and a handful of washers. wedges, or facing off the base of the where you can feel the back end kick They're cheap and deserve some at­ A-arm, lowers the front end of the car a out and then control it by the seat of tention, if you expect to get the little bit, which supposedly ought to your pants and an educated right foot. handling you want. help handling some. On the other side In both the MRP and Jerobee cars, Above, we have talked about of the coin, both of these methods puts the degree of understeer can be changing understeer, but by changing a slight bind on the chassis plate, as the varied by changing the front spring the spring rates, you can also com­ mounting screws still go through the rates. It would be real nice to be able pensate for a slightly tweaked chassis. plate at a slight angle. Still, these two to tell you which way to go with the If the car is turning to the right better methods are much better than shim­ MRP chassis to get the degree of than it is to the left, try stiffening ming with washers and the amount of understeer you want, but there is some or softening the spring at the right pre-load is spread out some and prob­ disagreement on this, even within the front wheel. In the left hand turn, ably doesn't affect the chassis enough JoMac/MRP Racing Team. When do­ the right front is the outside wheel, so to worry about. Your choice, just don't ing the tape for this article, almost that's the one to play with. Make notes use washers for shimming. everybody at JoMac got involved, and on how the change affected the car, Go to more than one R/C car race all seemed to have a slightly differ­ then go a step further (add more and you are bound to see somebody ent idea on how spring rates, weight washers or cut out more coils) and have to drop out due to the antenna transfer, steering under power, steer­ again note the difference. If you pay support tube coming out of the re­ ing under braking, chassis tweak, etc., attention to what is happening, it ceiver. This is dumb, especially when

84 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER the fix is so easy. With the tube shoved a WINNER almost a Stahl design see your local hobby dealer into the receiver, put a drop or two of AO years a go ---- Hot Stuff around the base of the tube. Don't expect this fix to last forever. Check it once in awhile and reglue if v V necessary. At the other end of the receiver an­ RUBBER & CO? tenna, let's hope you have an inch or V • 108 so of antenna sticking out the end of -j J a u m J u L OGA « 10 9 Earl Stahl’s famous the support tube. If not, I wish you 24 1/2* WINGSPAN — $ 6.95 plenty of luck in removing your sup­ — and Rr«n»in Spcrd»trr port tube from the receiver, now that it A WINNER AT THE 50th NATS - is glued in with Hot Stuff. If you do 28* WINGSPAN — have an inch or so of excess antenna, $6.95 tie a knot in the end of it with the knot Send for free brochure. tight against the support tube. During a Mottocaufi* race, you may still have the antenna 22l/2'w— - F L Y LINE M O D E LS support tube come loose at the re­ 10% FOR PACKING AND POSTAGE. $695 ceiver end, but with the knot in the end VA. KESIOCNTS A00 4% TAX. N/ 10643 ASHBY PL FAIRFAX.VA 22030 of the antenna, at least you won't lose the support tube, leaving the bare antenna to be ripped out. Another very necessary radio com­ JOHN POND ponent that can come loose is the changeable crystal. A wide rubber band is wrapped around the radio case and slipped over the crystal. If the Old Time Plan Service band is wide enough, a slit can be cut The largest selection of plans in the world at the most into it, the tail on the crystal being reasonable prices. Each list 75c stuck through this slit. This gives a very positive retainer for the crystal, yet No. 8 OLD TIMER F/F GAS crystals are still easy to change. No. 8 OLD TIMER RUBBER/TOW LINE The JoMac radios are generally owered with dry cells. I regard radio No. 8 OLD TIMER FLYING SCALE A through K Catteries as very important, so I con­ No. 8 OLD TIMER FLYING SCALE L through Z verted my radio to nickel-cadmiums with a unit available from JoMac that P.O. Box 3215 comes with batteries, plugs and San Jose, Calif. 95156 charger. An overnight charge before Phone (408) 292-3382 going racing guarantees no battery roblems. For those still using dry Catteries, it is suggested that you keep so; the radio will stay in, using the close track of the batteries and put in stock mounting system and without new ones when you figure the bat­ over-tightening the mounting screws. teries are about half shot. Don't trash the old batteries; use them when you The fuel tank supplied with MRP go out for some one-on-one rat racing cars works on a negative pressure prin­ around the local concrete jungle. To ciple, more commonly known as uni- use old batteries in a race is not only flo in model airplanes. Internally, the asking for trouble, it's truly false MRP tank has a feed line with its pick­ economy. up point located in the center of the Another point concerning receiver tank and right at the bottom. Each vent batteries is to keep everything as clean line goes to the bottom of the tank, the as possible in the battery box. Clean right vent to the right bottom side, the Do you Know that almost any modern glow engine can be converted to ignition R/C operation? We stock many sizes the ends of the batteries and the left vent to the left bottom side. In by different manufacturers, converted to ignition and available for immediate delivery. We also can convert your contacts in the battery box frequently. operation, the air venting into the tank favorite engine to ignition, if you wish. A ll work guaran teed to meet your satisfaction. Complete line of ignition It's only common sense preventative to replace the fuel going to the engine accessories stocked at all times. maintenance. has to bubble up through the fuel left 77 PRODUCTS. 17119 So. Harvard Blvd. The brick radio unit itself is tripod in the tank. This creates a slightly Gardena, California 90247 mounted (three-point mounting, two negative pressure in the tank, and if the rear, one front) in stock condition and tank is without leaks, will result in this is not changed, as the tripod really consistent engine runs. This with the tank comes when it is time to mounting allows the chassis to flex style of tank, when used on a model refuel it. With the vents both going to pretty much independently of the airplane, does not go lean towards the the bottom of the tank, it is necessary radio brick. Be sure to use the grom­ end of the tank. If anything, it will to turn the car upside down when re­ mets and do not tighten down the supply a richer mixture at the end of a fueling. Seems to work OK, but is cer­ mounting screws enough to compress tank. tainly not very sanitary. The other op­ the grommets noticeably. This allows The Class B cars (normally powered tion in Class B is to fit the tank with a the radio to be insulated a bit from with a Cox TD .049) always seem to fast-fill plug from Randy's . . . assum­ shock. With the heavy abuse that an suffer from leaning out during a race, ing you can even find one of the rare R/C car is subjected to, it would seem with a flame-out being the result. So things. Here the problem is that the that the radio should come flying out the MRP tank is a lot of help in getting fast-fill plugs are designed to be used of the car about the second endo. Not good, consistent runs. The problem in positive-pressure tanks where the

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 85 why. On the throttle linkage, Bob regards a positive throttle stop as very im­ portant. For the Class A car, this can be a No. 4 sheet metal screw in the top of the Cox nose mount for the motor. Check out a pic if it's not clear to you. Notice that the long arm on the throttle ring hits the stop at low throttle. With­ out a stop, getting a consistent idle can be hit 'n miss what with chassis flex being able to give a higher or lower idle setting without any command from the transmitter. On a TD pow­

RFP-1, 2-9/16" square t l w n < im ·<·■ i i i i n i i i I l it i ·· i u NH I t i t t t ClltUC l· » " ' ered Class B car, the venturi is used as by 9/16' thick; 450 mah CLASSIC ERA MODELPLANS the throttle stop. mi n.(t m il 355 Grand Blvd. im t.m i.iu ii1 m i ... gidforll Qh|0 44146 The reason Bob doesn't feel the Sug. Ret S15.95 less conn. need for an adjustable quik-link on the Kraft, Futabd conn available. brake linkage is that he has his trans­ mitter fitted with the optional trim knob for throttle. With the positive 'aASH!! throttle stop, throttle trim is not used to adjust idle, however. Instead, the trim 180 mah, 2 oz. is used to fine-tune the amount of 1-15/16" sq. X 13/32 thick. brake available at low throttle. The wire linkage is bent to give approxi­ Steering shock link: S1.50 pp. mately the right amount of brake and 0 RUBBER SCALE PLANS the trim takes care of it from there. Introductory Offer! COMPLETE PLANS SHOW ALL PARTS, BOTH WINGS. PULL STAB. PROP BLANK« Neat trick. 2 RFP-1 p a c k s , SCALE SOURCE REFERENCES The amount of braking force de­ 1 shock link $25.00 pp. 20‘Polk«rt· SK-2, 20 Cro*by CR-4. pends upon the track. Bob dials in as 13* C h a m b erm a id . 13' P o lk « r t · SK -2, Check or Money Order with order much brake as he can get without 13'Floyd B«an. 10'Smirnoff Boaro«t breaking the rears loose. The only ac­ SotSØQS Postpaid Poralgn add *10Q curate way of finding out if you have ROBINAIRE ordar from·. CLOUDBUSTER VENTURE PO, Box 2921 enough or too much brake is to run on Box K, Boca Raton. Fla 33432 Livonia. Michigan 40100 the track. In the pits, about all you can DEALERS INQUIRIES INVITED do is to be sure that the brake isn't overly tight. Experience helps a bunch pressure itself helps to keep the fast-fill for doing it is that rocks and dirt get in here. pinched closed. But the MRP tank between the tank and the tank mounts. Even though the brake strap is a very operates on negative pressure, so After a lot of racing, this trash may simple appearing piece, even here keeping the fast-fill closed can be a finally wear a hole in the tank. A leaker there is a little set-up trick. The brake problem. To fix this, Bob uses a tank can ruin your whole day; glue it strap should be in contact with the closure spring inside the riser tube for in with silicone. clutch bell only when you want the fast-fill. This is simply a piece of Due to manufacturing considera­ braking. The rest of the time it should light music wire soldered into the top tions, MRP has to build the tanks with ride completely free of the bell to cut inside of the riser tube and bent so that the fuel pickup line exiting the tank at down on power-robbing drag. To get one end of it extends over to the fast- an outboard location. This does seem this kind of fit, apply maximum brake. fill plug. Light tension of this music to work OK, but I prefer to have as Then take a pot of boiling water and wire against the lips of the fast-fill keep short a fuel feed line as possible. So I pou r it over the brake strap. Wait a few things airtight, yet allows fast pits. relocate the pickup line in the center seconds and then pour cold water over In Class A, we have a different prob­ of the tank on the back side. This may the strap. The boiling (or near boiling) lem, as fast-fills are not allowed. The or may not be a worthwhile modifica­ water makes the strap very pliable and Pylon jet-Fueler is allowed and most tion. Your choice. it forms itself to the bell. The cold use it. But you still have to turn the car As can be seen from the pics, I have water then makes the strap take a set in upside down to fuel it. modified the rear body mount to more this position. If you've done this What I am trying on my Class A car securely mount the Cobra body. As properly, the brake strap should re­ is a Pylon Jet-Fueler on the filler tube supplied, the Cobra body mounts with lease itself from the clutch bell very and a normal vent (venting from the one body pin front and rear. The Tony cleanly and without any unnecessary very top of the tank). This of course Bellizi-inspired trick here is to mount drag. · eliminates the negative pressure fea­ two 1 inch body pins to the rear mount Concluded next month ture of the tank, but the reed-valve platform. This gives the desired tripod motors suck a lot better than the TD's, mounting for the body, plus the right being very choked-off with the stan­ ride height. Stinger...... Continued from page 13 dard venturi size. With good fuel Over the tank and under the rear draw, a normally vented tank ought to mount platform are the wire linkages edge must be 1/8 inch lower than work OK, yet be a lot easier to fuel. for brake and throttle. As with the the trailing edge. Line up the center The tank mounts in the MRP cars steering linkage, Bob uses the stock of the wing at the trailing edge with work great, but when you get the tank pieces on his own race cars. I have the vertical center line on former No. working like you want, be sure to glue been tempted to put a Du-Bro quik- 2, and get the wing tips equidistant it to the tank mounts with silicone link on the linkage to the brake as from the tail. Five-minute epoxy is glue. This does hold the tank just a many others do, but this is not really sufficient here, as the wing is later little more solidly, but the real reason necessary, and in a minute, I'll tell ya built right into the fuselage.

86 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER The horizontal stabilizer, with ele­ vator hinged in place and controls CUSTOM TUNED ENGINES connected, is now carefully aligned and glued in place. Next, the fin is AND COMPETITION H i - T l i e r installed, making sure it is 90 degrees ACCESSORIES to the stabilizer and true fore and aft. Specialists in standard Now the top sheeting, the turtle- or throttled Cox .049/. 051 deck, and the noseblocks can be fitted and glued in place. Cut the and Rossi .15 engines, cockpit to shape, paint the interior, parts & quality racing products. install instruments and pilot. No For detailed information, cockpit floor is required, the top of send 13c stamp to: the wing is just about right. Trim the Kustom Kraftsmanship canopy to fit and install. The fuse­ lage can now be sanded to fit its P.O. Box 2699 Build’n Fly Airplanes final shape. Laguna Hills, CA 92653 The cheek cowls can be carved from balsa or molded from fiberglas, (714) 830-5162 depending on individual preference. The cowls run back to the wing, and angle, then cement the wing panels the epoxylite wing fillet is continued together. Note that the dihedral isn't right around the cowls. The fin and the same on both wings, it's a 1/2 inch stabilizer are also filleted with on the upper and 1 inch on the lower. Easy to Build epoxylite. Let these joints dry well. Fun to Fly It will be necessary to file away a Make the two wings struts now, and little wood from the fuselage sides in leave these a little too long at this 10 authentic, true-scale order to fit the landing gear flush stage, as the final length will be deter­ models and 4 original against the 1/4 inch plywood mount. mined on assembly. Make slots for stylized designs plus a With the hatch in place, there should these struts in the lower wing only; at ready-to-fly NAVY be no gaps. the upper end, the struts lean against BATTLE JET glider. All Two coats of finishing resin, with the wing rib. Cement the lower wing no cloth, seems sufficient for the into place, then test fit the upper available from Hi-Flier. fuselages of all the Stingers built to wing onto the pylon. If you've left Great fun for everyone! date. A heavy coat of K&B primer, enough space between the root ribs, All made with: well sanded, makes a good base for the pylon should slip easily between • simplified balsa frames your choice of paint. them, but if it's no go, then sand a FLYING little off the pylon and glue into place. and printed parts-tlssue The balance point should be no Test the wing struts for fit, trim them body more than 3 inches back of the lead­ to the final length, then glue . . . but • plastic propellers, engine ing edge with the fuel tank empty. before the glue is set, check the align­ cowlings and wheels The throws on all control surfaces ment of the top wing, both from the • rubber-powered motors should be no more than 3/16 inch front and side, and make any correc­ From HI-FLIER KITES... each way. tions required. Hold about 1/2 up-elevator, and Frame 1, the 1/16 ply firewall, can the flying toy experts! when released, the Stinger will lift off now be attached, and this completes almost immediately with no turning the construction work. When all the THE HI-FLIER tendency. The rest is up to you. · gluing has dried, sand all over, round­ MANUFACTURING CO. ing off the edges of the fuselage a little, then brush on a coat of clear A Damon Company Moskito ..... Continued from page 55 dope, followed by a final sanding. 510 East Wabash Avenue all together, using a vise or something After this, the final decor is up to you, Decatur, Illinois 62525 si mi I ar to press the wi re i nto the wood. but don't add too much weight by Area Code 217/429-4361 Cut out the fuselage sides, including painting excessively. Our prototype (429-6318) the slot for the horizontal, then join was given a further coat of clear dope, together with the aid of Frames 2, 3, then colored with marker pens. The motor installation, as you will and 4. Pinch the sides together at the positive location. Run the supply pipe have noticed, isn't shown on the rear, and glue. When this is dry, in­ externally down the right side of the stall the tail assembly and make sure plans, due to space limitations. How­ fuselage, and let the filler pipe float ever, the photos show that the motor that it's aligned correctly before finally freely, as the plans indicate. cementing it into place. Now cut out is simply tacked onto the front, and The beauty of this installation is and attach the wing pylon (Item 5), doesn't really need much description. that the complete system can be easily My main modification was to discard followed by the upper and lower fuse­ removed without tearing the model the two tiny nuts and bolts supplied lage sheeting, noting that this is in­ apart. stalled with the grain running cross- with the Telco unit, and substitute the biggest self-tapping screws that would Test flying is best done in a grassy ways. fit the mounting holes. The motor was area, so that the model w ill have This assembly can now be put aside then simply screwed to the 1/16 ply something to bounce off while going to dry while we get along with the firewall. through the trimming process. Start final wing construction. First trim the The location of the tank unit is with some power flights, as there's not excess ends of the wing ribs away, shown on the plan, and is a very slight much to be seen from hand glides. then sand all except the wing root push fit into the cockpit. If required, With the engine throttled back (on the edges round. Sand these wing roots a small scrap of 1/16 sheet can be Telco motor, the crankshaft cam to the bevel required by the dihedral glued behind the tank to give a more should be set at around 2 to 3 o'clock JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 87 POLLY WINS & WINS & WINS... WINS BY DESIGNER BILL BLANCHARD: • 1977 Nats 1974 thru 1977 USFFC • 1971 NFFS Model of the Year • 9 AMA Records in Open HLG since 1970

ψ Kits available: $3.98 DT, S2.49 Std. Ug ^ See your local dealer first!! ^ DIRECT ORDERS ADD 50 tf PER KIT POSTAGE CALIFORNIA RESIDENTS ADD 6% SALES TAX

AERO MODELING ENT., Box 11, Cerritos, Ca. 90701

When both of these trims are that will not slow your boat down with achieved, you might try opening up too much drag. According to the Na­ COVERUP! the throttle . . . but remember, you've tional Advisory Committee for Aero­ Sturdy, dark green vinyl covered only got a finite amount of energy in nautics (NACA), the optimum angle binders for your valued copies of the tank, so expect more exciting of attack for number 2421 standard MODEL BUILDER. Gold logo. flights, coupled with more rapid visits airfoil is about 22°. A greater angle to the liquor store for more gas! · would produce a negative effect due to the high degree of drag. Power Boats.. Continued from page 42 The angle of attack will vary accord­ ing to airfoil, air speed, etc. I would over the curve of the airfoil must say 22° could be considered a maxi­ move at a faster velocity than the mum, and you will probably find a air flowing across the flat bottom of much shallower angle will be ef­ the airfoil, because the air over the fective. top has a greater distance to travel. 3. All surfaces of the wing and Applying Bernoulli's principle, the superstructure must be smooth and result is Tift. free of turbulent features. If you feel Now, as we increase the angle be­ ambitious and creative, how about a tween the airstream and the leading wing with "low-drag boundary-layer edge of the wing (increase the angle control". This principle involves of attack), we increase the lift. If we maintaining the air speed of the layer apply this to a hydro by placing the of air on the surfaces of the wing Only S4.95 each, two for $8.95, three wing past the rear running surface, by pulling part of it through small for $12.95, four for $16.95, or five and if we increase the angle of attack, air holes near the leading edge, fo r $20.50, postpaid in the US. Canada then the lift to the transom will keep through chambers, and discharging at and Mexico add 30 cents per binder. the front of the boat down on choppy the trailing edge. This process should Overseas add 50 cents per binder. water. Thus, if we keep increasing the help decrease turbulence. California residents add 6% sales tax. angle of attack we can expect all posi­ 4. If you use plywood for construc­ NOTE: One binder holds 1971 and 1972. tive effects. Right? Wrong! As the tion, it is recommended that you Use one binder per year for 1973 to present. angle of attack increases, so does the laminate several layers to the desired (For UPS delivery, add $1.00 per binder) opposing drag force. thickness. Be sure to run the grains With this background in mind, let's in opposite directions for strength. MODELS consider what factors we can use in The wing and structure must be strong designing a good wing for a boat. It is enough to withstand that occasional BUILDER important to understand that a wing flip at 70 mph. 621 W. 19th St., Costa Mesa, Ca. 92627 will not improve every boat's running 5. By keeping the angle of attack characteristics. So don't be dis­ low, you can increase the lift by in­ when viewed from the front), put a gas couraged if your early attempts prove creasing the area of the wing. This will charge in the tank, tweek the rudder unsuccessful. Generally, we are con­ also keep drag down and could a little to the left, then launch. If sidering high-speed outriggers and produce the results you need. the down-thrust is OK, then the model other hydros, and possibly 50 mph 6. The location of the wing is very should climb briskly in a sharp left mono designs. important. Positioned on the front spiral. If it's not OK, then there will 1. No matter what shape or size air­ deck or fuel tank area in a downward probably be a lot of hanging on the foil you use, the wing must be ad­ attitude will only deter speed and prop, ala old-fashioned rubber justable. A fixed wing will just not be cause excessive drag. The intent is models. Add down-thrust as required useful during changing conditions and good if it is designed to keep the in 1/64 intervals (ply shims behind trimming the boat. boat from blowing-off, and it may the motor). 2. The angle of attack is also critical accomplish this; but the location is Now for the glide. The main prob­ to the wing's efficiency. As the angle poor. A more effective area is behind lem here is to prevent a straight glide of attack increases, so does the lift the last wetted surface, where it would path, as the model flies quite fast, and factor. However, drag increases at a be adjusted to create lift to the because of the size, can easily become proportionally faster rate, so you must transom. The desired result would be very lost. find a compromise between lift/drag achieved without the drag.

8 8 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER FROM THE WILLIAMS BROS. SCALE CLASSICS! FOR THE SERIOUS MODELER

'Φ GEE BEE RACER 1/32 MARTIN B-108 1/72 CURTISS C-46 . 1/72 exciting and historically important aircraft in NORTHROP plastic kit form, featuring a selection GAMMA of configurations and decal markings. 1 7 2 V fc lA H S BOEING 247 1/72 SEND 50« FOR COMPLETE CATALOG DEPT. MB 181 PAWNEE STREET · SAN MARCOS, CALIFORNIA · 92069

So if your boat needs stability, why flying at an angle greater than 60 not try a wing. Experimenting is the degrees from horizontal. . .? And spice of life. After all, that's what won't it be fun trying to find people to keeps boating interesting, it allows direct Carrier events with such a rule RUBBER POWERED FLYING SCALE the modeler to be creative and in force? A m te t A r r o w 2 V * original. · If you have more money than time, 3 * c Chipmunk 20" Provost - 19" now you can (legally) "buy 'n fly" Mustang - 18 1/2" your way into the winner's circle in ■vd: Hurricane 1 *1 /2 " C/L...... Continued from page 47 Luscomb 21" Combat. That isn't totally accurate, of Fairey Junior 17-1/2” Cessna 140 19-1/2" our AMA is interested. But it could course, as winners in Combat are gen­ — 16 others — very well be that our AMA is not erally the better fliers, not the better $ 2 .7 5 . capable of dealing effectively with so buyers. But it sure is welcome relief to CATALOG 35Í many special interests within the ranks many to get rid of the Builder-of-the- AVAILABLE THROUGH YOUR LOCAL DEALER of the membership. And I'm not so Model rule in Combat. Even Jean D IRECTACCESSORIES. ORDERS AR/C D D & 10% C/L SHIPPING. UOOELS 7ΝΌ» U M INΉ· IM U M sure but what that isn't simply a Pailet voted for this proposal, indica­ statement of fact, rather than a criti­ tion of changing times, the influence •{► MAJESTIC MODELS·!· cism. To make my point, I was going to of MACA, or both. 3273 WEST 129 ST list a bunch of special interest groups, One Combat proposal that passed, CLEVELAND. OHIO 44111 but just a minute of thought later I had and I still can't believe this one, is to over 20 on the list! It should be allow 15-powered models to fly on obvious that no organization the size .012 lines. Do you realize how easily a of AMA and with the budget the AMA new Fox Combat Special can cut a set IToctor HARDWA R E has to work with, can possibly deal of ,012's . . . and how a set of ,012's • WORKING TURNBUCKLES with so many groups to each group's would fare in a jerking contest at the • RIGGING & CONTROL CABLE ^ satisfaction. center (as in a line tangle) when up CONTROL HORNS ^ ,& Still, my answer to the question against a set of .018's? If for some • STRUT FITTINGS H ~ “ What does the AMA do for me?" is reason we would want to let 15's and that it doesn't do enough for me. A • COCKPIT TRIM 36's compete against each other on • PULLEYS selfish answer, of course, but one I will lines of different diameters, the safer • INSTRUMENT HOUSINGS stick with, thank you. No matter what way to do so would be to require the your answer to the question is, I'll bet it 15-powered model to use .018's and won't be too hard to find your District the 36-powered model use .012's or { * ( * I For informationmlo and catalogue V.P. willing to listen to it. j seaaL.S.i-QDia s .015's. Just think about it for a minute DrvITodor ENT. CORP. BUILDING SEASON . . . you'll catch on. P.0. BOX 9641 'Tis the season for building, in addi­ I explained this to Ron McNally, SAN DIEGO.CA.92I09 tion to Ho-Ho-Ho and Happy New chairman of the CLCB, and his reason­ Year. If you are among the C.F.'s and ing was that if the rulebook said it was G.C.F.'s, I certainly hope you are up- OK to use .012's on 15-powered the Cox 049/051 engines. Since then, I to-date on the rules to be used in '78 models, then at least the CD's would have used the hemi-head plug for a and '79. Sure would be too bad ifall of be covered by the rulebook instead of few flights in a really honkin' TD .049 your Slow Combat planes for the next just allowing this on their own, placing that is mounted on a Dirty Beaver season came up with short noses, this themselves in a bad situation in case of (1/2A Combat plane). The plug lived being defined as less than 5 inches an accident. Sounds to me as if, in through all of the runs and just gener­ from the leading edge of the wing to Ron's area at least, there is a CD ally worked great. Unfortunately, I drive washer of the engine. Or how problem, not a rulebook problem. forgot my tach when we went flying, about that Speed ship you're just Now that the rule is in the '78-'79 but it was pretty obvious that the finishing? Are you sure there will be an AMA rulebook, it is assumed that we engine ran faster on the GloBee plug, event for it next year? Many classes of will have a problem nationwide with as compared to a Cox No. 1702 high Speed were dropped, you know. fly-aways. A strange solution to a local compression head. Changing from the How about the Carrier plane de­ problem, don't you think? Nitrotane 1/2A 70% fuel to a mild signed to do your basic Sabre Dance I KNOW, I PROMISED brew of 40% verified the claim that on slow speed? Aren't you going to be Yes, last month I promised to let you this plug needs about 50% fuel to keep surprised when the SeeDee disquali­ in on the performance of the new the fire lit. fies your flight because the model was plugs from GloBee, designed for use in For those running on milder fuel, or

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 89 TOLEDO TWENTY-FOURTH ANNUAL RADIO CONTROL EXPOSITION

TOLEDO SPORTS ARENA ONE MAIN STREET TOLEDO, OHIO Unquestionably, the world’s greatest radio control show and its open to the public all three great days Plan now to attend. A PR IL 7,8 FRIDAY S AM TO B PM SATURDAY S AM TO S PM SUNDAY S AM TO 3:30 PM presented by WEAK SIGNALS R/C CLUB P.O. BOX 5772, TOLEDO, OHIO 43613 llllllllllllllllllllllllll mu wanting to use a GloBee plug in a Now that even those at the MB pin; it should hold the motor just reed-valve engine, the Glo Button office are after me, I think it is past time above the LE of the front wing (stab). Standard, using standard coil material, to close out for this month. · Check to be sure there are no offsets is suggested. in any surfaces .. . this model is very When talking horsepower, in all of Canardart .... Continued from page 64 sensitive to misaligned wings or fin. the modeling events, there is only one Torque will give it a natural turn. that rewards pure power without con­ a sheet of tissue (Vintage Aero or Now make up a motor from 1/8 sideration to other factors. That is Peck Japanese tissue) over them on a Vintage Aero or Peck rubber . . . it Speed, of course, and in 1/2A Speed, soft building board. Glue the wing and should be a loop about a foot long. the plugs are setting records. How's tail outlines to the tissue, getting glue There is no point in test gliding, since about Open I/2A at 122 plus? in the wood-to-wood joints. Do not the model (being primarily an un­ Although I cannot verify the claim (I glue the motorstick to the tissue as on orthodox sport job) does not have a forgot my tach, remember?) Harry Roe normal model. Once glue is dry (if super glide. Just wind on about a says that rpm gains of 800 to 1500 are you use a cyanoacrylate like Zap, hundred turns for a lower power test, possible by just switching to a Glo But­ that is instantly . . . but be sure to after insuring that the CG is at the right ton. You'll have to wait a bit for this, put plastic wrap under the tissue) you point (1/4 inch in front of rear wing though. The plugs are to be introduced can trim the parts from the covering. LE). Add clay to nose to get this right. in the spring of 78. Cost? Less than We used a No. 11 X-Acto, but that's If the Canardart does nothing Cox plugs, which makes them very because we didn't have one of MB's erratic, try about 200 turns, going up to desirable, even if they give the same fine Uber Skivers! fWow . . talk about about 300 turns max by stretch­ power as Cox plugs. a subtle hint! wen) winding with a winder. The Sterling A CONTEST CANCELLED Butt-join the wing halves, propping 5:1 winder w ill do. Hook it up to the Every once in awhile, I like to slip in up one tip 3-1/2 inches for dihedral. front of motor while someone holds a contest of some kind, just to see if Crack the stab (forward wing) along prop shaft, stretch out 3X and begin anybody actually reads this stuff. As I centerline and prop up to same dihe­ to wind, moving in slowly. On the write this, we are making plans for the dral angle . . . see plan detail. Glue count of 60 (that's 300 turns) pinch Thanksgiving Day holiday, so it came the subfin to the motorstick. Cut the the motor near winder hook, back off to mind to throw a contest here in the top out of the plastic thrust bearing, a few turns and you have a little loop pages of MB and to give away several leaving both sides intact to glue to the to hook on the rubber hook. Be sure turkeys to the winners. But then on motorstick. Turn it upside down and to wind backwards. . . this is a pusher! second thought, I realized that if MB glue on with 0-0 thrust. Now add the If the model stalls, try a bit more gave away any of its turkeys, Unca' two wings to the motorstick, propping clay or a fin trim tab to induce some Bill would just have to go out and hire up the LE of the front wing (stab) turn. If it dives, try a bit more inci­ new staff members to replace those with a scrap of 1/8 square. See detail dence under front wing, but do not given away . . . (Anyway, who wants a at front of motorstick on plans. Now move the CG back. Avoid trying to Dirty Turkey?! wen) add a small rubber hook bent from a turn the model in tight circles. We 90 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER • RADIO CONTROL, FREE FLIGHT, & CONTROL LINE • STATIC COMPETITION IN MANY MODEL CATEGORIES APRIL 28,29&30 • OUTDOOR DEMONSTRATIONS HOURS: 1978 • FRIDA Y, APRIL 28 - 1 PM to 9 PM • GIANT RAFFLE . . . MANY PRIZES • SATURDA Y, APRIL 29 - 10 AM to 6 PM • LECTURES AND HOW-TO SESSIONS • SUNDAY, APRIL 30,- 10 AM to 5PM

INTERNATIONAL MODELER SHOW BOX 127, COSTA MESA, CA 92627 PHONE (714) 548-4700 hope you have as much fun with if you would like to be involved in Earle's words, "The damned thing Canardart as we did in Beirut. We operating the FAI F.F. Team selection just fell together. It was the best kit also hope the flying is under much finals, you can give the entire pro­ I've ever seen." Since Earle's model­ more peaceful circumstances. With gram a boost by offering your site. ling days span Joe Ott and Megow that in mind, we leave you with the This year, the geographical limitation Models, that's quite a compliment. Arabic farewell "Mas salamah" which which applied during the last pro­ Pictures of the Moorhead-built means literally: "Go with safety." · gram does not exist, so anywhere in Square Eagle w ill appear in next the country is fair game. However, month's installment of Model Builder BILL OF MATERIALS: time is short. The deadline for sub­ Free Flight. If you want the kit, or One Sig AMA Racer kit or the mitting a site bid is January, 1978. any of the other fine models manu­ following: If you can do it, do it. Contact factured by Blue Ridge, drop them a 1/8 X 3/8 X 13 balsa Rol Anderson, Chairman, FAI F.F. line and a self-addressed stamped 2 - 1/16 X 1/8 X 36 balsa Committee, 3769 Alexis Rd., Toledo, envelope, and they will forward to 8x10 min. sheet Japanese tissue OH 43623. Give Rol a call at (419) you their 3-page brochure. You North Pacific prop assembly (from 474-2117. won't be sorry, as there isn't a bum­ Sleek Streak) ANOTHER NFFS mer in the bunch. All of their kits 2 feet of 1/8 rubber SYMPOSIUM ANNOUNCEMENT are done with T.L.C., and literally The National Free Flight Society fall together. After you have built F/F ...... Continued from page 61 is soliciting papers for the 1978 one, you'll wonder how they do it for Symposium publication. Papers the price they charge. Address: Blue FAI FINALS SITE. . . should cover some aspect of the Ridge Models, P.O. Box 9188, Ashe­ You Got A Place? science or art of free flight models. ville, NC 28805. As of the writing of this column, Send an abstract of your proposed OR SO IT SEEMS the FAI Finals, scheduled for Labor paper immediately to: Bob Dodds, This, the 4th anniversary of this Day weekend, 1978 still has to find Box 436, Rancho Santa Fe, CA column as writ by Bob Stalick, has a home. The FAI F.F. Committee 92067. gone by in no time. It has been an has developed a set of criteria for BLUE RIDGE MODELS enjoyable and pleasant duty to write site approval. In order to overcome DOES IT AGAIN this column. It is made more pleasant some of the difficulties which have Earle Moorhead, erstwhile past by those of you who read it and arisen in the past, the committee is president of the Willamette Modelers respond to it. I do appreciate your accepting bids for sites. These sites Club, Inc., and perennial non-builder cards and letters (and phone calls). will then be evaluated in relation to of models (The article on the Round Keep 'em coming. May the next 4 be the developed criteria. The site TUIT was written with good ol' Earle as good as the last . . . and if the which most nearly meets the opti­ in mind), has discovered a kit that last weren't good to you, may the mum will be selected. So, if you even he can and w ill build. The next 4 be better. have a site or know of a site, and Square Eagle 30 is such a kit. In Thermals... ·

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 91 EIGHT "ELECTRIFYING" EVENTS!! 1. JR. FREE FLIGHT: Any plane and motor, unlimited motor run. 3-minute max, for contestants under 16 years of age only. 2. FREE FLIGHT SCALE: Mooney system for scale judging and flight scoring. 3. OLD TIMER REPLICA FREE FLIGHT: For Astro 02 motor only, any old timer, 25 second motor run, 3-minute max, hand launch. 4. UNLIMITED FREE FLIGHT: Any motor, any plane, 25 second motor run, 3-minute max. 5. R/C POWERED SAILPLANE: A 2-minute motor run and 6 minute max, with spot landing bonus points. 6. SPORT PATTERN: Novice Pattern with special handicap bonus points for planes with less than 4 channels. Anyone can win this event! 7. SPORT SCALE: Stand-off scale, Mooney judging system, extra bonus points for multi-engine aircraft. 8. R/C OLD TIMER: R.O.G., Precision, Spot. Free Flight CD: Bill Stroman, (213) 868-1479 R/C CD: Bob Boucher, (213) 472-6344 CHAMPIONSHIPS Preregistration requested. Name______AM A ______MODEL BUILDER MAGAZINE AND ASTRO FLIGHT Jr. F/F ( ) R/C Sailplanet ) COMBINE TO BRING YOU THE FIRST ALL-ELECTRIC F/F Scale ( ) R/C Pattern ( ) CHAMPIONSHIPS. TROPHIES TO THIRD PLACE AND F/F O.T. ( ) R/C Scale ( ) F/F Unlim. ( ) Freq______FOR GRAND CHAMPION. PRIZES FOR ALL. COME JOIN Each event: $1.00 All events: S4.00 US IN THE QUIET REVOLUTION AT MILE SQUARE, All events for whole family: $5.00 FOUNTAIN VALLEY, CALIFORNIA, ON JAN. 29, 1978 Send check and registration to Bob Boucher, 2301 Cheryl Place, Los Angeles, CA 90049

vice on construction. and assemble these parts, then F o lke rts...... Continued from page 51 And, since Peanuts use so little cement in the wing spars in seg­ building materials, why not invest in ments between ribs. Finally, add the jargon of race car buffs and think in diagonal trailing edge bracing which terms of Stage 1, Stage 2, and Stage the best quality? The .040 stripwood, .040, .020 and .012 sheet, condenser greatly inhibits warping, and cement 3 "tuning". the wing plug-ins to the root ribs. A "Stage 1" Peanut can be recog­ paper, and Micro Coat called for in the plans are all available from Now for the fuselage. Two con­ nized by its 1/16 or thicker frame­ struction options are shown on the work, generously doped Japanese tis­ Gerald Skrjanc of Micro-X Products, P.O. Box 1063, Lorain, Ohio 44055. plans. In the "outdoor" version, the sue covering, plastic prop and body sides built over the black out­ wheels. It's usually too heavy to fly (His catalog is 750.) I would recom­ mend his Ultra Cement for gluing line are assembled and completed long. using the conventional former and A "Stáge 2" model might be built balsa, but used thinned white glue for laminating the wing tips and at­ stringer method. from the same plans, but using The body of the "indoor" version, selected light stripwood with balsa taching foam parts. The plastic model paints required for the foam which was flown in the contest, was propeller and wheels. Flights of a essentially "formerless". After gluing minute are common. wheels, spinner, and pilot, and the Floquil paints and Dio-Sol thinner the sides together at the tailpost A "Stage 3" Peanut uses 1/32 or and adding formers F6 and F1B, the .040 indoor stripwood and con­ used to spray paint the tissue, are available at hobby shops. structure was mounted on a special denser paper covering. A few kits form and the top deck completed are available, such as those sold by Let's warm up by building the tail with a purely stick construction as Micro-X Products, but they are often surfaces. They're of conventional illustrated in the auxiliary drawing. scratch-built. Such models can pro­ construction, but the result is about vide the ultimate thrill-flights of two 2.4 times lighter than what you'd end It is essential that you first run strips minutes or more. Nor need appear­ up with using 1/16 strips and sheet- of 1/4 inch wide Saran Wrap over ance be sacrificed, because, as I will wood. each dummy former and tack them explain, they can be spray painted Optimizing structural design is just to the bottom of the base, or you'll with an airbrush to provide just as as important as using lightweight never be able to remove the beau­ colorful a finish as their Japanese materials, and the wings, which we tifully light and true creation you've tissue rivals. turn to next, incorporate many fea­ built! Hold the form over heat to 'Nough said . . . Let's build the tures which maximize strength and shrink the Saran Wrap strips so they SK-3! stiffness with minimum weight. won't slip off during building. And If you haven't already done so, I These features include built-up ribs, cut the strips at the base to facilitate strongly advise you to buy and read laminated tips, and a thin sheet removal of the partially completed Fred Hall's book, "In d oo r Scale leading edge which is much stiffer fuselage, pulling out any strips that Model Flying", for an expert's ad­ than a spar of equal weight. Build stick afterwards. Now cement in the

92 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER R/c SO A R IN G IS N ’T O U R O N L Y B A G

BUHL "BULL PUP"

TYPE: SPORT SCALE * ENGINE: .09 - .15 * CONTROLS: 2 or 3-CHANNEL * WING: BALSA & SPRUCE - FLAT BTM. • READY TO USE . . . NOTA K IT FUSELAGE: FORMED PLASTIC WITH PLYWOOD & • ROTO-CAST POLYETHELENE BALSA * WING SPAN: 42" * WING AREA: 269 SQ. IN. • LIGHT WEIGHT AND PRACTICALLY INDESTRUCTIBLE WLYING • ATTRACTIVE AND EASY TO KEEP CLEAN FLYING WEIGHT: 25 - 32 OZ. * WING LOADING: 13 - • HOLDS ANY SIZE CAN OF FUEL SECURELY 17 0Z . PER SQ. FT. • REMOVABLE 4x7x4 DITTY WELL IN TOP DELUXE QUALITY KIT INCLUDES: • HAS ROOM FOR MOUNTING POWER PANEL, ETC. • PRE-CUT BALSA WING RIBS • HOLDS ANY SIZE TRANSMITTER SECURELY • PRE-CUT BALSA SPAR WEBS • HOLDS ANY STARTER IN SPECIAL STARTER WELL • PRE-CUT PLYWOOD FUSELAGE FORMERS • HOLDS ANY MOTORCYCLE OR GEL-CELL BATTERY SECURELY • VACUUM FORMED ASA FUSELAGE SKIN • LARGE 1214 x % x 2 DRAWER FOR PROPS, TOOLS, ETC. • FORMED LANDING GEAR • 10 MINUTE INSTRUCTIONS FOR AIRCRAFT CRADLE • CONTROL RODS • COMPLETE HARDWARE PACKAGE

7851 ALABAMA AVENUE · CANOGA PARK, CALIFORNIA 91304 internal and bottom fuselage cross­ on the prop form, then sand to a like a ghost ship." Buy a good air­ pieces. very thin airfoil shape, less than 1/32 brush. I am using a Paasche with Build the bottom deck on a in thickness. Mount the blades on the the H-3 tip. Go to your local sup- separate form, remove, and cement propeller hub at the proper angle, lier of bottled gas, wave the air- in place. Almost finished . . . and not using triangular templates temporar­ rush hose, and tell him you want a much more difficult than conven­ ily cemented near the tips as a guide. 20 lb. refillable cylinder of CO 2, a tional construction, except that the Now that the framework is all regulator with a 0-60 psi gauge, and whole darned thing is pretty delicate done, plug the wings into the wing an adaptor to fit your hose. He'll before it's completed! mount slots and check that both probably tell you he wants about If you wish to include the pilot, have exactly the right angle of attack $80, but its worth it. Mix yellow don't forget to build, paint, and in­ as indicated by the construction note Floquil with up to 50% Dio-Sol stall him before cementing the string­ on the plans. If not, fix up the wing thinner, and with 30 psi set on the ers and sheeting over the cockpit plug-ins until they do. regulator, spray as fine a mist as you area between F8 and F9. Cigarette Sand the structure very gently can get on the condenser paper. If wrap is about right for the side win­ where needed, and brush on two the mist is as fine as it should be, dows, which are attached with thin coats of thinned dope where the you will have to apply several coats, dope. Hold over the stove to get tissue will be attached. I employ but stop as soon as a translucent them tight. If you don't have a thinned dope to fasten the condenser yellow-cream color is obtained. To vacuum-former to make the canopy, paper, then use a perfume atomizer paint wood or foam yellow-cream, you can heat shrink the mylar over filled with water to spray tighten. mix some white paint with the yel­ a balsa form . . . as I did. Condenser paper will not warp the low, using Floquil on wood, plastic structure the way Japanese tissue model paints on foam. The red wing "Turn" the wheels and spinner by does, so don't be afraid to get it and stabilizer leading edges are most holding sandpaper against the rough- fairly moist. However, to cover the easily brushed on after marking the cut foam as it rotates while ce­ tail surfaces, first shrink condenser boundary, with a red felt-tipped pen.- mented on a dowel shaft in your paper onto a balsa frame, then lay Moto-Tool. Hollow out the spinner the freshly doped framework on the Use a black felt pen for the control- with the Moto-Tool and slot it so it paper and let dry thoroughly before surface outlines and panel separa­ will be removable to expose the pro­ trimming. If you plan to fly out­ tions. Consult the three-views for peller winding hook. Use Hot Stuff doors, brush the covering with Micro the location of the latter if you wish to cement the prop shaft to the hub Coat to prevent sagging tissue on to include them. after binding with thread, and also humid days. The lettering and decals were to cement the landing gear in place made as follows. Spray pre-shrunk (but not until the fuselage has been Now for some suggestions on sheets of condenser paper red and covered and spray painted). Cut out, finishing, or "Why a condenser black for the larger lettering; trace soak, and bake tne propeller blades paper covered model needn't look the outlines on bond paper and sand- JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 93 right circles of 60 foot diameter; mark this setting. If your model is Greatest Book of heavier than mine, you'll need FULL-SIZE RUBBER FLYII\fG thicker rubber. (Micro-X has a wide increment of sizes.) Your 1937 SCALE PLANS, plus Thompson Trophy winner is now building, trimming, and SCALE MODELS ready to take on today's compe­ flying instructions ever tition! · published! OF W W II H a n n a n ...... Continued from page 54 Twelve half-inch scale Q f O I O i O Obi-Wan Kenobi, played by Alec rubber powered flying Guinness, bears a remarkable re­ models by some of the semblance to Richard Miller, of 12 FULL SIZE PLANS hang-glider fame, and delivers the world's best modelers, • M i «HlOCAt • OXUftMAM r#f MtltCAT most polished performance. We • VOUOHl NUCO NtAl* including Doug Mc- • MitsuatiHi nno were glad to see that Carrie Fisher • HA.WKIK IHMIUCMiK I (daughter of Debbie Reynolds and Hard, Clarence Mather, •aunuMAMMC amriM • unstHsuMin at toac Eddie Fisher) had washed her pre­ Bill Hannan, Bill War­ • r o c v t nut,» t * t u •KUMMUCMWA vious role out of her hair, in her • c u n r a j h o c ner, Bob Peck and •*« jd tm u n d «im kk.t portrayal of Princess Leia. She seems • re m must a m to have inherited her mother's voice others. • CDVE»INO AND tlllMWIIIC • MAXIMO f t fi.V and her father's features. Luke Skv- walker (Mark Hamill) is properly Compiled and pro­ FEATURE ARTICLES ON "All-American Boy" throughout, in ALL 1/24 SCALE the best comic book tradition. But it duced by I.E. Coleman, (1/2"· 1') BUILDING, FINISHING, AND edited and published FLIGHT ADJUSTMENTS. is C3PO (See-Threepio) and R2D2 (Artoo-Detoo) that keeps things mov­ by Model Builder Ma­ AVAILABLE NOW - $6” ing in the good humor department, gazine. with their Mutt and Jeff antics. SEE YOUR HOBBY DEALER, OR ORDER Model builders will be intrigued DIRECT. ADD $1.25 FOR FIRST CLASS. with the various space vehicles, CALIFORNIA RESIDENTS ADD 6% SALES TAX. which resemble old Nash Ramblers, FLYING more than the ultra-jazzy machines 621 West 19th Street usually found in sci-fi movies. The SCALE MODELS Costa Mesa, Ca. 92627 weapons are equally unlikely, pre­ senting the paradoxical combination of ancient and modern. How about wich the condenser paper between even soloed, in the cockpit, I a sword which emits a limited- this and another sheet of bond, and wouldn't put too much reliance on length laser beam? Or spaceship cut out with a sharp blade. I used the test pilot. Balance the model guns with World War Two style black rub-on letters for the smaller where indicated, wind just a few Pom-Pom action? On paper, it printing, since I couldn't obtain red turns in the motor, rotate the thrust sounds very corny . . . but it isn't on letters. Use a very fine brush to button about 45° for right and down the screen! Rather, it is so out­ paint the comet, planets, etc., on pre­ thrust, and check the vertical tail for rageously incongruous as to seem pared yellow condenser paper, with 2° right turn setting. Try a few perfectly logical. the pattern underneath to guide you. "glides" with the prop just ticking In summary, we suggest you attend Now attach everything to the model over and add clay to the nose or tail and prepare to be entertained. To with thinned dope. The plans explain until it's correct. Maiden flights are paraphrase a line from the film, "Let how to make the louvres and pitot- best made outdoors on a dry, wind­ the FARCE be with you"! static tube, if you wish to add these less dawn or sunset . . . grass is a NEW MODEL MAG touches. lot more forgiving than the gym wall. New model publications appear FLYING With more power, adjust the thrust about as regularly as lower prices. With a doll-like idiot who hasn't button by rotating it until you get Thus, we were delighted when Georges Chau let sent us a copy of a new aviation magazine from Spain. Although our linguistic capabilities MOVING TO SOUTHERN CALIFORNIA? are limited, we greatly enjoyed the MAKE SURE YOU GET A HOME many photos and illustrations. From WITH A MODEL WORKSHOP ! ! what we can deduce, the magazine will deal with several facets of air­ FOR ALL YOUR REAL ESTATE NEEDS CONTACT craft, including models, hang-gliders, ANITA NORTHROP and man-carrying sailplanes. The quality of the paper is first-rate, and SPECIALISTS IN ALL PHASES OF REAL ESTATE. the abundance of advertisements suggest a strong financial base. En­ CROCKER REAL ESTATE gine collectors might well be turned- G n tU M y . on by adverts for the Spanish LLAM powerplants; ball-bearing units avail­ We’re H ere For You. able in both diesel and glo varia­ Each office ii independently owned and operated. tions. In fact, all this fine new publication would appear to lack is a Office at 621 West 19th St. Costa Mesa. Ca 92627 (7 1 4 )6 4 2 5062 Spanish Peanut! Further information 94 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER could probably be obtained from: AEROSPLAI, Periodisticas con el No 1416, Aragon, 331-1°, Barcelona 9, Spain. SPOKED WHEEL KITS Peck-Polymers has announced Superior Products for the> availability of the “Hunt" spoked wheel kits. Featured are detailed in­ Serious Hobbyist. structions, formed plastic wheel components, a jigging base, hub bearings, and lacing thread. Offered in various sizes, the wheels are in­ tended for use on small flying scale models. Complete price and size list may be obtained by sending a stamped, addressed envelope to Peck-Polymers (see advert in this mag for address). UFO's AGAIN In earlier Hangars, we mentioned the flying saucer ports located in France and Canada, each claiming to be the first of its kind. Now japan has filed claim to that honor! Ac­ Hobby products developed by Evercoat Laboratories are cording to the October AVIATION specifically aimed at the serious hobbyist. Among our fine NEWS, the UFO facility is located products are: finish coat resins thatd/y in thin coats .. .new close to Mount Fuji, ana cost over a five minute cure glues and fillers .. .unique microballoon million dollars to build. In addition filler .. .super light-weight glass cloth — thirteen products to a four-foot thick landing pad made in all .. .see them at your local hobby shop. Ask for Evercoat of asbestos-impregnated reinforced for assured quality. concrete (which ought to be able to Fibre Glass-Evercoat Co., Inc. withstand even a crash), the space­ o 6600 CORNELL ROAD. CINCINNATI. OH 45242 port features a sort of temple, com­ evercoat 700 N. Batavia St.. Orange. CA 92668 plete with helmet-clad buddha 1437 Railroad Ave., Bridgeport, CN 06605 figures. Funds for the unique project were donated by a Japanese super­ market czar. TIME FLIES AMA Prexy Johnny Clemens sez: MANPOWER UPDATE Recently, TIME magazine pub­ "They use small wind-tunnel models Thanks to Russ Hiatte, of Taft, lished a gallery of its front cover to check out ideas, then scale them California, and Ron Moulton, of Eng­ pictures . . . some 2,810 of them, up to full size. After that works, land, we have some additional facts. spanning the period of 1923 through model builders miniaturize 'em The prize has, of course, been offi­ 1976. People associated with avia­ again!" cially granted to former model tion fared quite well in representa­ HAIRY PEANUT? builder Paul MacCready and his tion. Some even appeared more than The most popular chimpanzee in crew. In addition to the heroic pilot, once. With only a casual scanning, the San Diego Zoo is named KAKO- Bryan Allen, Dr. Peter Lissaman and we discovered the following pilots, WET .. . phonetic for "cacahouete" another model builder, Vern Older- designers and others who influenced . . . the French word for Peanut! shaw, made important contributions. the progress of flight in one way Happily, others who have man- or another: JAPANESE GAS powered machines underway have Anthony H.G. Fokker, Glenn H. We promised additional reports on not been forgotten. Lee Du Bow, of Curtiss, Henry Ford, Giuseppe Bel- the NITTAN brand Japanese CO 2 Palomar Airport, has put up a trophy lanca, Capt. Rene Fonck, Charles cartridges. These capsules are of for the first manpowered craft to Lindbergh, Richard E. Byrd, Orville welded design, which eliminates the reach 100 feet of altitude. And back Wright, Hugo Eckener, Harry Gug­ leakage of other types. The result is in England, prizes remain for the first genheim, Winston Churchill, General more uniform pressure, ideal for ap­ 3-minute flight by a competitor from Italo Balbo, Juan Trippe, Frederick plication to model CO 2 engines. the United Kingdom, and another for Rentshcler (Pratt & Whitney engines), Our initial tests were so encouraging flights around a slalom course by a Bill Bridgeman, Gen. Hoyt Vanden- that we decided to give them the Commonwealth flier. berg, James H. Kindelberger, Igor "acid test" (pun intended, as CO 2 is Additionally, Henry Kremer has Sikorsky, Lt. Col. Paul Stapp, Roscoe also known in some quarters as car­ pointed another ten thousand pounds Turner, Jean Harlow (Hell's Angels, bonic acid), by using them under for the first entrant, other than from remember?), Donald W. Douglas, contest conditions during the Call· the United States, to complete the Glenn L. Martin, Hermann Goering, fornia Nationals. Results were be­ original figure-8 course. Will Rogers, Air Marshall Barratt, yond expectation, and we were able Many photos and specifications of Vice Marshall Playfair, Rueben Fleet, to count upon uniform "fills" every the MacCready machine have been "Hap" Arnold, Sir Arthur Tedder, time, for our Brown Junior engines. published, but we have yet to see a James H. Doolittle, Leroy Randle The cartridges are being distri­ 3-view. As soon as one appears, a Grumman, Gen. Curtiss LeMay, buted through sporting goods stores, scale model of it would seem to be Danny Kaye, Howard Hughes, Capt. but if you are unable to locate them in a position to blow the lid off all Charles Yeager, Arthur Godfrey, and in your area, you might contact existing records. At last, a full-size Major General Tunner. Takehide Sumi, Vice President, NIT­ "ghost" ship! UP AND DOWN TAN (U.S.A.), Inc., 4901 Mořena JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 95 FOKKER FK-3 1/6 Stand-Off Scale now in full kit form and completely redesigned for KIT INCLUDES: one thing: Thermals • Poly Glass fuselage. • Canopy. • Machine-cut wing and stab s rib. • All balsa and spruce. • All necessary hardware. • Easy to follow full size plans W ing Span ...... 128" and instructions. W ing Area ...... 750 sq. in. Wing Loading ...... 8-10 oz. $89.50 Length ...... 48.5" W eight ...... 42-48 oz. Aspect Ratio ...... 21.85

Rt. 3, Box 457, Coeur D'Alene, Idaho 83814 W INDSPIEL MODELS (208) 664-6894

r Γ\ ^ Rockefeller Center in New York. He GOOF PROOF KNIGHT , Λ ,5” flew right on the ice rink! Second model is by Jerry Farr, 2802 TRIM SHEETS! H B H - 3 2 < 1 y v : _____ J Robertson, Abilene, TX 79606. He i L/ 5 " X 3 6 " sheets CATALOG 2 5 € built this incredible Citabria for 1/2A in red, white, blue R/C. The model uses a Cox RTF (No. yellow, orange, aluminum, MODERNISTIC MODELS 290) reed valve engine and weighs in olive, dayglow orange^ , PO. BOX 6 9 74 ALBUQ. NM 87107 at 18 oz., for a 200 sq. in. wing. The dayglow yellow^ black only clue that this is a model is the It's an you been flying models all your iron-on, so life?" Answer: "Not yet!" · elevator horn, which is barely visible if you goof, in the shadow! re heat, lift, Third, Dumas has bailed com­ reposition ÖSÄ H a l f - A ...... Continued from page 63 pletely out of the airplane line, but lished by Russ Sandusky, at 1122 Jay Brandon, the President hasn't for­ Plaza Cir., Jappa, MD 21085. Dues gotten us. Here is a really cute cabin C O V E R I T E j are $6 each January, payable to cruiser for Medallion .049 R/C power 2779 Philmont Awe. Huntingdon Valley, Pa. 19006 CL-RPM. and two channels of radio. Could be Two problems hit me last month. free run or tethered too, if you wanted. Blvd., Suite 307, San Diego, CA Here they are . . . the causes and Fourth model is as close to a ready- 92117. their solutions. First, I had a QRC to-fly as you can get in an R/C model. CONCORDSKI? which would not rev up. It ran OK The Cox Cessna Centurion comes rich, but died off when I tried to get molded, pre-painted, and with engine, The Soviet Union's TU 144 super­ full power. The problem turned out to sonic transport was scheduled to pushrods, control horns, and nose enter regular passenger service on be a bent con rod caused by use of an landing gear in place. About 30 min­ November 1st. It had been deliver­ electric starter when the engine was utes are required to PUSH the radio flooded. The clue was that the metal into position and attach the rods to the ing mail and cargo on a regular rim around the reed valve area was basis since December, 1975. Origi­ servos, apply the full-color, authentic scored. The rod had to be hitting it, stickers, slip the wing dowels in place, nal intentions were to place the which meant some distortion had hap­ machines in service during 1971, but rubber band the wing on, and push the pened. I disposed of both piston/rod rear landing gear into its sockets. I various troubles forced delays. Won­ and crankshaft. der if they'll let them land in New have flown four different copies of York? Second problem was an engine this model, they all fly alike; smooth which would run perfectly, no matter and docile, but with good wind pene­ CONGRATULATIONS, PIPER! how I held the model, but died in a fast In an age when most factory- tration and climb. The trike landing roll. The cause was that the fuel hose gears are well placed, so landings produced lightplanes are uniformly between tank top and "clunk" had dull "spam cans", it is indeed re­ and even ROG's are easy. The wing slipped so that the clunk hit the rear has a semi-symmetrical airfoil. Trim freshing to see something new and of the tank. exciting appear. We refer to the doesn't change much when the engine "Tomahawk", recently announced MODELS FOR THE MONTH quits. The model has been tested in by the Piper Aircraft Corporation. First, Chris Leila, of 120 Pelham purposeful crashes to check out its One glance at our featured photo­ Road, New Rochelle, NY 10805, sent structure . . . it is very rugged. graph will show how different it is, in photos of his 1/2A C/L stunter, Fifth and final model is House of with "radical" features usually found "The Sunspot." Chris uses a Tee Dee Balsa's 1/2A "Pete", the little brother only on homebuilt or foreign aircraft. .049, 6 x 3 prop with Uniflo tank, to their big stand-off-scale Pietenpol Wouldn't this make a fine subject no pressure. Weight at 200 sq. in. is Air Camper. This photo was shot in for an R/C model? 9.8 ounces. Bob Hunt describes the 1974 at the MAC Show. Don Dom- HOW'S THAT AGAIN? finish on this model as being perfect, browski set the design aside for a few From the Poway Pilots Newsletter, and he really knows! Chris used the years until he had some other models edited by Lee Rose: Question: "Have Sunspot for a big model demo at the completed and kitted for his 1/2A line- 96 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER DU-BRO SNAP-ON

TAKES CARE OF ANY : _ _ ~ j MISALIGNMENT. BALL LINKS THREADED LINK BOLT-ON LINK 5-Piece ball link set (No. 181) is This 3-piece ball link set (No. 180) MAKES excellent for off-set steering, is a must for all helicopters and is THROTTLE i throttle and servo hookups. HOOK-UPS readily adaptable for rudder, elevator Includes steel ball assembly with EASY! and servo linkage on R/C planes, 2-56 thread, washer, nut, threaded boats or cars. Ball joint action coupler and nylon ball link. eliminates binding and is neat and Easily adjustable. Only 8 5 C clean in appearance. Only 85 C • TOUGH NYLON LINK SNAPS-ON DU-BRO PRODUCTS AND HOLDS TIGHT IM P 480 BONNER ROAD ι ι ί \ * . v v a u c o NDA, ILL. 60084

up. Now that 1/2A scale R/C is catch­ large models could be the answer. Let s - F LY ’N T H I N G S '------v me explain what I mean. I've had , SMALL MODEL SPECIALISTS: Complete , ing on, the 1/2A Pete is in the line 1 rubber power supplies. Plus, Flyline Models, and on the shelves. Power has to be a several conversations with Clarence I R/N Models, Classic Models, Micro-X, Peck- | Tee Dee .049 or 051, as the model is Mather regarding rubber scale rules. ■ Polymers, F.H. Spokes. Shark CO2 engines. . I Williams Bros, rubber, Japanese tissue. Pea- ' too large for reed-valve engines. You He favors dropping the 100 second I nut balsa, and more! could use a Black Widow or Tester's max to around 80 seconds or even I WHOLESALE ONLY: Dealer, Distributor. 1 8000 for Free Flight Scale with this lower. Why? With a lower maximum and O.E.M. Sales. I VINTAGE AERO · 1 THE GLEN I kit. time required, the models can be more V______JTENAFJ.Y^NJ. 07670______J A final word . . . all you Free realistic and more diversified in de­ Flighters out there (all ten of you?), if sign. We presently see essentially the care, and I'll tell you why. Simply you want coverage of your specialty, same type of models, often sparsely stated, competition causes an ad­ you have to get in touch and send detailed, in favor of attaining the 100 vancement of the art. The way anyone photos! I have published all the F.F second mark. With a lower maximum can really improve is to try some com­ pics I have, so get with it and submit!· time I would think that the models petition. Going out and sport flying is would or could have more detail and great fun, but one's techniques can still be able to put in respectable improve immeasurably by watching F/F Scale .... Continued from page 53 times. As an example of this, Bill what the competition is doing. Also, Third place went to my venerable Noonan's Hawk Moth had a fantastic etting a cross-section of foreign ABC Robin. This particular model has scale score and deservedly so. It had uilders and seeing how they do been a real pleasure from the very tremendous detail within its 44 inch things can't help but improve the art beginning, and has done very well for wingspan. When it came time to fly, of F/F Scale. it put up consistent flights of be­ me in contests over the years. It is One prime example of what I'm powered with one of the early Brown's tween 40 and 45 seconds. The sight of this large scale model in the air is truly talking about is Peanut scale. Peanuts (serial No. 112), and has always been at one time were considered sensa­ very reliable. In fact, I like the early spectacular! I'm sure that Bill could have put in more winds and increased tional flyers if they could attain flights design much better than the more re­ over 30 seconds or so. Steadily the cent one. The older versions look the flight times if he had to, but the combination of his scale points and times kept on creeping up. There are more like an engine than do the new probably more contests for Peanuts ones. the amount of time he was getting, was more than enough to win the event. over recent years, both indoor and As for gas scale, I wish I had the outdoor, than for any other form of answer to the lack of participation in The models, of course, would not have to be large, but it would help in scale, including R/C. Now the times this event. Apparently, there are just are nearly out of sight, and consistent­ too many modelers who do not want order to adequately carry more detail. I wouldn't want to specify what the ly so. This didn't just happen. Com­ to fuss with the hassle of fuel, batteries, petition has brought about the change. dirty airplanes, etc. It could even be size should be for a rubber scale model, but merely point out possi­ It also brought out a diversity in the that flying fields do not permit this type of aircraft modeled. So please, type of operation. What ever the rea­ bilities. Hopefully, we will have F/F Scale as an International event, and if don't snub your nose at the idea of sons, gas is certainly on the decline. International competition, because in Even at this year's Nats, the overall wind is a factor, without question, the larger models should fair better. the long run, we will all benefit from gas entries were low, with some elec­ what is learned at these special events! tric and CO 2 taking up the slack. I As long as I have brought up the In the past, I have mentioned some hope something can be done to re­ subject of International Scale compe­ of the interesting finishing techniques verse the trend. tition, as mentioned earlier, something that are used by George Tames. He is All in all, I would say that the has to be done about stimulating F/F a real aficionado of the Dr. Martin Flightmasters 28th Scale Annual was gas scale. This would be the other dyes, and he does some rather fasci­ another successful contest, with event, along with rubber, in which we nating things with these water-soluble numerous F/F scale flying beauties . . . would be competing. We would dyes. Here is a new twist to his and through all of this, the overall definitely want the best representation covering methods. In preparation for tempo was one of absolute FUN! from this country, but if hardly anyone the dyes, George covers his models I would like to expand on a couple is actively engaged in F/F gas scale, in white japanese tissue, using of items I mentioned earlier. With we cannot expect to do very well in thinned-out white glue for the appli­ many rubber flyers advocating new this particular event. cation (very important to use white rule changes, striving for some Many of you could probably care glue for applying the tissue). Then the equality between scale and flying, less about International competition. I covering is water-shrunk in the usual JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 97 Sailing...... Continued from page 43 trouble remembering to incorporate TRIC that in my discussion. FLY The class has maintained strong control over auxiliary functions. VL-101 Electric propulsion system Only sheets, and jib twitchers are shown—using Hytork 48 motor and allowed as running rigging. The idea planetary gear box, SJ-3 switch & is to make skipper skill, not pocket- charging jack, and B-33L fast charge book, the difference between win­ ni cad flight battery—total weight ning and losing. This tight control 2l/i 02.—will power models 25 to has been the result of a class techni­ 50" wingspan weighing up to 10 oz. cal committee. The Tech committee Send 50c for latest catalog showing V L PRODUCTS keeps abreast of new developments full line equipment & accessories. Division or Vista Labs and advises the Class Secretary of Hobby dealers send for information. 7023-D Canoga Avenue their effect on the one-design phil­ Canoga Park, California 91303 osophy within the class. They also do a good job of sounding out skippers throughout the country to find out what kinds of planned jfe&Ř FREE FLIGHT evolution might make the boat a HARDWARE better one to sail. An example of this was the decision to ask the class ustralian to vote on a reduction in mainsail WINDING BALSA A roach from 3 to 2.25 inches. The BOOMERANGS! appearance of the boat was im­ 32 SIZES-PREE ILLUSTRATED c a t a l o g lh | proved, as the new main looks more bniov fun 4 Sport scale-like (and let's face it, there is a BOOMERANG MAN Ä large component of esthetic enjoy­ \3lQParkJg7 Monroe.t.a 71201 ment in model yachting). Also, heavy weather performance was improved by reducing sail area way aft on the mains'l where it did the most to pro­ mote a wild weather helm. Overall performance was just about un­ changed. I took an absolutely new boat out into our local fleet wearing manner, however, George uses an air­ Instead of using the typical India ink the only "small" main. With weather brush for spraying the water. His next treatment for outlining the ailerons, from 0 knots to some wild 18 knot step is to make a very dilute white flaps, fin and rudder, etc., he filled a gusts, the new main came through glue solution, using about 5 or 6 parts Rapidograph type pen with a com- and the boat wound up winning the water to 1 part white glue. He air­ merical bleach such as Purex or event. The reduction in area cer­ brushes this solution over the entire Chlorox. He then ruled with this pen tainly did nothing to devaluate model. This acts like a sizing and the different separations, leaving a downwind performance. leaves the surface very smooth. Over neat white line. The white portion of Building a 12 can vary from the sheeted areas, you can lightly sand it the German crosses was done essen­ ready-to-run variety, to nothing more and apply another coat, followed by tially the same way, except he used than a bare hull and a copy of the more sanding. This will leave a a brush dipped with bleach. If you class specifications. Most of the pre­ smooth, pore-filled surface. After the have a steady hand, ^11 registration sently manufactured boats can be "sizing" has dried, Dr. Martin dyes numbers and letters can be done this obtained with the deck already at­ are applied, again using the airbrush. way, using a fine brush. In fact, you tached to the hull. This does elimi­ Various colors can be mixed together can outline the letters and numerals nate a rather tedious evening of to get any shade or color you want. with the bleach-filled pen, using a measuring to be sure that the sheer As everything used prior to the dyes straight-edge, then come back with a beam tolerances are met, but makes were water-soluble, the dyes, as ap­ small brush and bleach and remove gear installation a little bit tougher. plied, are very uniform in texture. If the remainder of the color. The pictures accompanying this dope had been used to put on the This method of finishing a rubber column are of my new boat. FOXY tissue, this would not have happened. scale model gives them a very inter­ LADY III is a Crump and Associates After the dyeing has been applied and esting and distinctive look, and best hull, (see ad in December '77 MB). dried, a single coat of thinned nitrate of all, the weight increase will be It came with the deck on, all blocks dope is brushed on. No more dope is insignificant! I’m sure that many of in, and the rudder installed. I required, because the thinned-out you can think of other innovative adapted the mast off of the TRACER white glue takes care of filling the changes to George's techniques. If so, to the 72 inch length required by the pores of the tissue. please pass them along so that we may EC/12 specs. It took me exactly one Now, for another interesting twist. all profit from your discoveries! My day to mount all the gear, pour the George has found out that bleach re­ address is 19361 Mesa Drive, Villa lead and test float the boat. That is moves the dye from the tissue com­ Park, CA 92667. · hardly to be called "building" in pletely. At our last club meeting, he my book. brought his multi-engined Dornier While most of the winning boats push-pull model. It was finished in a are using wooden masts, I have very neat camouflage pattern typical opted for the aluminum one from of the aircraft of the Third Reich. Reynolds Mfg., in Orlando. 98 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER This boat was built the right way. I assembled all the gear that was to go in it; winch, batteries, R/C gear mounting boards, the rig, and so on. The whole package was weighed in­ side the hull/deck. That weight was subtracted from 24.5 pounds and yielded the amount of lead ballast that could be poured into the keel. POURED LEAD KEELS The writer and Model Builder magazine disclaim any responsibiity for any problems which may occur if this process is tried as a result of reading these instructions. It is DAN­ GEROUS, and requires careful atten­ tion to detail. We are absolutely not responsible for any difficulties, in­ juries or damage which may be caused by pouring molten lead into a model yacht. The proper weight of lead is melted in a crucible of some sort. I have found a stainless steel, seam­ less bucket to be a good choice. If the melting is done indoors, provide adequate ventilation, since zinc fumes may be emitted from the lead, and that can stop you from further modeling ... to say nothing of further living. While the lead is melt­ ing, mount the hull, with the keel dam in place, inside some sort of a container, on a slight bow down slope. Weight the hull and surround it with water. Do not let any of the keel which is to be filled with lead touch the bottom of the container. saying that this kind of a job can people sailing with jib trim, and There must be free circulation of result in your untimely demise if you since they don't really understand the water to remove the heat from take a jaunty attitude. Don't risk what it is doing, they spend as much the lead and preserve the integrity your eyes or skin. Wear some old time hurting themselves as helping. of the fiberglas and resin hull. I clothes, and make sure you wear a Beginners are best left to learn how usually put a masonite lid over the good set of goggles or safety glasses. to sail the boat. Extra functions de­ hull, with a 3 inch hole centered While you are engaged, send the tract from developing the concentra­ over the keel cavity. Spend plenty of family and the dog out to a movie (or tion necessary to sail well. In this time leveling the hull and blocking a cat fight). If you can use a one-design class, there is no gadget it securely. MOST IMPORTANT . . . plumber's rig for melting the lead that will make you significantly faster THE KEEL CAVITY MUST BE AB­ outside, so much the better. They are than everybody else. This is really SOLUTELY DRY. NOT ONE DROP available, with propane cylinders, at true if you are sailing against the OF WATER IS ALLOWED IN THE a very reasonable cost, from tool likes of Ron Stephanz, Buddy Black, KEEL. The reason is that the hot rental outlets. Bob Harris, or any of the dozen or lead will convert any water in the A well handled 12 will sail just so top skippers to be found in the hull into superheated steam. As the fine with lead shot poured in for bal­ class. steam expands it will blow the last. The molten-lead trick is not TIPS ON SAILING molten lead back out of the boat all really necessary, unless you have AN EAST COAST 12 over your body!!!! Be sure that you your heart set on the national cham­ Sailing to weather . . . This is have an assistant check the bottom pionship or the Mini-America's Cup. where fortunes are made or lost. A of the keel cavity immediately before I'm going to assume that if you have good start in this class is worth 40% you pour the lead. set that as your goal, you'll do the of the total for winning. Making it to With cold water, and good cir­ job carefully enough to insure your the weather mark first will put you culation around the hull, I've seen survival to sail the event with two in control of about 60%. Anybody this job done to hulls with lacquered eyes and all your fingers. . . who gets by you after that will have bottom paint and not even one blis­ I've seen 12's sailed with every to get through your dirty air and that' ter forms. Be very careful!!! Get rid conceivable kind of internal equip­ is extremely difficult. Most changes of all children, dogs, and wives be­ ment. The R/C gear is usually two- of position after that first beat occur fore you start. If you use old tire­ channel, but the class rules do allow at the marks. Beating with a 12 is a balancing weights as a source of both a jib trim function and a jib- game of conservation of momentum. lead, they are going to (1), smoke twitcher, in addition to the two Keep the boat moving at all times, like crazy while the oil burns off and sheets and the rudder. Any other and resist the pinching that the hull (2), be about 25% short on weight kind of running rigging is absolutely is capable of. The boat will point a after you skim the metal clips off the illegal. I'll stay on record on behalf good 10 degrees higher than the top of the lead melt. of the absolute minimum two- direction at which she is making her Let me finish my comments by channel arrangement. I see a lot of best speed to windward (Vmg). JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 99 — ------Ί RUBBER POWERED SLATS ANTIQUE SCALE I COMPETITION MODELS C o u n te r...... Continued from page 8 FOR COUPE d ·' HIVER OR AVRO TRIPLANE I UNLIMITED CLASS — CAUORON versing switches; metal open gimbals; INCLUDES RUBBER & PROP. LINCOLN BEACHEY ■ KIT FOR SIMPLIFIED FOLDING PT-1 .002% crystal tolerance; vibration PROPELLOR WITH ALL HARDWARE BELLANCA BIPLANE J proof batteries; dual or single stick; all LONGSTER III these and more features are built-in with the Specialist Eight. If you have MAVERICK CURTISS PUSHER any plans at all for a new radio for COUPE OR LIMITED '78, we strongly recommend that you 34 WINGSPAN obtain all the literature available from $10.95 Millcott, either at one of the coming trade shows, or direct from 1420 Vil­ AVAILABLE SOON lage Way, Unit E, Santa Ana, CA FOR THE NEW C02 92705. .010 ENGINES 24” WINGSPAN * * *

ADO ) l 00 FOSTAGC K M (ACM KIT | CAUKMNIA M SID O m ADO « X TAX I Cal Aero-Model, 7142 Bluesails mmmmrnmmmmmmmmmm* Dr., Huntington Beach, CA 92647, has informed us that production of the 1938 Powerhouse and 1939 Air Trails FREE CATALOG Sporster has ended, and only about SUPER COVERITE NOW 100 kits of each are, or will be COMES IN A NEW COLOR: available. ★ 144-pages Both of these "Series 50" Old ★ Over 3000 Timer R/C kits are designed for .09 to items .15 power and three-channel radios. They feature pre-cut parts, formed ★ Hard-to-flnd landing gear and partial hardware. precision tools The Powerhouse sells for $31.50, the ★ Useful Tool Tips Sporster for $33.50. Don't forget, this may be your last Your single source for hard-to-find tools used chance to get a kit for one of these It simulates the look of by hobbyists, technicians, scientists, labora­ reduced-size old-time favorites. old-time airplane coverings. tories, schools. Send for your free copy of this * * * most wanted catalog today. COVERITE uj With the exception of the ones who 2779 Philmont Ave Huntingdon Valley, Pa. 19006 JGNSGN TOOLS & ALLoys just started last Saturday, all small 1230 SOUTtl PRÆ ST DRIVE · TEfTipE. A Z 85281 mode! enthusiasts are well familiar with the service and supplies that have Being a displacement hull, the 12 as they catch up with you. Good been available from Vintage Aero in pushes a lot of water out of the way skippers usually only resort to luffing Tenafly, NJ. They still are, but that when she goes forward. It takes strategies when approaching the company has now gone to wholesale energy to do this. As long as the sails finish line, or in the period just be­ only; to dealer, distributors and are pulling well, the boat will move. fore the gun goes off-at the start. O.E.M., and all of its products are When you tack, the power from the When sailing the reaching legs, do available at the retail level only at your sails is lost. As a result, the boat everything you can to get and keep local hobby shop, or by direct mail slows down as it swings through the clear air. Reduce your heel angle, from Aircraft Model Products, Box wind. The power does not come on and the size of your wake, by slack­ 318, Scituate, MA 02066. again until the sails have filled on ing your sheets. The boat will be the new tack. The twisting of the hull going faster, but the smaller wake A retail catalog has just been pub­ in the water as it turns causes a and the lack of heel will seem to lished by A.M.P., and is available via greater loss of energy than if the boat you to be indicative of a slowing First Class Mail for only $1.00. Your was just allowed to coast straight down. T'aint true, though. Convert buck will also bring you a full size ahead. The result is a tremendous all the energy into forward thrust Peanut Plan; ours was an extremely loss of speed every time you tack. and you'll scoot out ahead of all well done Curtiss "Swift" Pursuit. The moral of the story is to keep rest. Remember that old dictum, Listed are all the Vintage Aero tacking to a minimum. Don't put the "WHEN IN DOUBT, LET'EM OUT!!" products, as well as everything from helm over every time you think Remember to send in your 1978 Peck-Polymers, R/N Models, Classic you've been headed. It comes out AMYA dues to Bob Crysler, 2709 S. Models, Sig, Hi-Flier, VL Products, better in the long run to keep the Federal Highway, Delray Beach, Williams Bros., Telco, and a host of boat speed up, and only tack when Florida 33444. And I'll answer in­ others. the shifts are fairly long lasting, and quiries if they are accompanied by a Accessories, such as Japanese tis­ of a decent size. This kind of tactic stamped, self-addressed envelope in sue, imported rubber, props, Peanut will in general see EC/12 fleets going care of MODEL BUILDER, or directly balsa, plans, and much more are to weather on one side of the course to: ROD CARR, 7608 Gresham St., listed. If the little ones are your way or the other. Skippers who try to Springfield, VA 22151. · to fly, you shouldn't be without this short tack up the middle usually one-source catalog. A price list is also drop back with each tack. available for a S.A.S.E., tell A.M.P. On the beats as well as other legs, you read about it first in MB. avoid luffing matches. The speed you * * * lose when you luff a nearby compe­ Micro-X Products, manufacturer of titor is just the speed that the rest a large and rather diversified line of of the boats behind you are keeping model products, has just what you 100 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER want for that young modeler at your house . . . or for that old modeler who is unfortunate enough to live where the winters are long and cold. They are called "Parlor Mites", a box-full of indoor flying fun. The materials are all of first class indoor quality, and include everything necessary to build and fly your choice of several different models. Included also, is a four-page instruction booklet written for the beginner, explaining the mys­ teries of wash-in, incidence, pitch, etc. The fine points of winding the rub­ ber motor of one of these little flyers is being illustrated by one of Micro-X's "Parlor Mates", Sherry. These quickly built small aircraft can be flown in the average living room, and have been known to reach flight times of over five minues in rooms with 25 foot ceilings. Information on the 'Mites; not the 'Mate (sorry!) can be obtained from Micro-X, Box 1063, Lorain, OH 44055. * * * To the aspiring modeler, happiness must appear to be having all of the many goodies that he sees at the field and shop. To the long-time modeler who has accumulated a large amount of this paraphernalia, happiness has to be something to carry it in! Whatever group you fit, Craft-Air has come to your rescue with a quality field support box that seems to have the good features of most boxes seen in use, plus some of its own. It is not a kit, doesn't have to be painted, is fuel proof, and is claimed not to break . .. either itself or you, as the price is only $29.95. The Craft-Air field box is molded from polyethelene, in bright, easy-to- see yellow. It has a base of 7-1/4 x 22-1/8 inches, and is 11-1/2 inches high. The empty weight is only 2 lbs., 11 oz. It has a 12-1/2 x 6-3/4 x 2 inch drawer in the bottom, a 4 x 7 x 4 inch well at the top, a well for the starter, and a ledge for the 12-volt battery, transmitter, and a gallon fuel can. Also there is enough panel space to allow for mounting your power panel or aire, the Florida outfit that has dis­ the skinny 450 MAH pack, is 33432. other support item of your choice. covered the way to thin them down, Rest of the address is: Box K, Boca Now you have no excuse for not will soon have a smaller one, of 180 Raton, FL. Tell them MB sent you to MAH capacity. This one measures the proper address this time. having it all together, and all you need 1-15/16 square by 13/32 thick, weighs is your bird in the other hand and 2 ounces, and is recommended for * * * someone to tell you which way the The winner of the 1/12th Scale wind is coming from. Try your dealer 1/2A's, Quarter Midgets, and any other low-drain, low-time flying. They Electric Class D, 6-cell outdoor event first. If he doesn't have 'em, write at the 1977 ROAR Nationals is now Craft-Air, 7851 Alabama Ave., will be available with Kraft or Futaba connectors, or without, so you may available, completely assembled and Canoga Park, CA 91304. install the proper type for your R/C ready to run, with radio, from JoMac * Φ * equipment. Products, Inc. Using the time-proven First flier to 2nd flier: "Say, your In an earlier mention, we gave MRP chassis, a painted and trimmed hair is getting a little thin on top!" Robinaire a wrong ZIP code, which Cobra II Lexan body, and the new Second flier: "That's OK, who apparently put it east of Florida some­ No. 406 JoMac Mach 3 Electronic wants fat hair!" where out in the Bermuda Triangle. Speed Control Radio Control System, Same thing applies to nickel-cad­ The correct ZIP to use when you ask this speedster is loaded with many miums. Who wants fat ones? Robin- for information on this new pack, or other desirable features. JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 101 50% reduction in cost since the initial release, and in this day of rising costs, Will mount with rubber bands we think this is commendable. Order or can be screwed down for $4.95 yours from Larry at the above address; permanent installation. complete don't forget to mention MB. Fits Cox Tee Dee and Medal­ less engine * * * lion .049 and .051 engines. Engine mounts upright or This seems like our month to bring inverted. Running time approx. 4 min. you good looking twin objects! Total weight 3/4 oz. Neither the last nor the least is the Injection molded from tough DAMO FS-218, an opposed twin- nylon. cylinder, four-cycle, pushrod oper­ Plenty of power for 3 lb. ated overhead valve, aircooled, glow airplanes. engine now available only from its distributor in Sweden. This new beauty displaces 1.10 cu. in., at a weight of 19 ounces, and is claimed to swing props of from 12x6 to 18 X 6 inches, at RPM's from 11,000 maximum to 1,200 at idle. The cal­ culated power is stated to be 1.25 HP. Constructed primarily of aluminum PRODUCTS and hardened steel, bronze is also 3407 W. MacArthur Blvd. See your used for the valve guides and seats, Santa Ana, California 92704 dealer or and the pistons are of cast iron. The order direct. engine is well equipped for long life, Phone (714) 557-1451 with the extensive use of bearings. Four ball bearings are used for crank­ interest and manufacturing have both shaft support, two needle bearings A.M.P. - Specialist in Vintage Aero prod­ increased. The latest from his new for the camshaft, and even the con­ ucts and all small models. Dallas base is the "Li'l Dolphin” , necting rods have needle bearings at WE CARRY: Vintage Aero, Flyline Models, a new three-way kit for the beginner. both ends. The carburetor is either a Micro-X, R/N Models, Classic Models, SIG, modified Perry or an OS. Hi-Flier, Peck-Polymers, F.H. Spokes, VL It can be powered by either a K&B Products, Williams Bros, plus SHARK and 3.5 CC Outboard, inboards up to 3.5 Interestingly enough, this engine TELCO CO2 engines. CC, or electrics of comparable power. does not use castor or any other lubri­ COMPLETE ACCESSORIES: Japanese tis­ The "Li'l Dolphin” kit comes com­ cant. It runs on straight methanol, sue in silver, black & colors, imported rub­ plete with pre-cut bulkheads, deck with up to 10% nitro. Because of the ber, props & accessories, Megow, Continen­ shears, cabin sides, and radio box. In­ extensive use of bearings, and with the tal & Ideal replica kits, books. Peanut balsa, use of proper tolerances, the manu­ plans, and more! cluded also is birch plywood sheeting and a plexiglass radio box lid, screws, facturer claims that the lubricating CATALOG $1 - FIRST CLASS RETURN. qualities of the methanol are ade­ 56 pages of the finest models & supplies; in­ and turn fin. Instructions include step- cludes FREE Peanut plane plan. by-step photos and building hints. quate. Oil at no more than 5% is recommended only for tightly cowled Send S.A.S.E. for current price list The length is 28-1/2 inches, and any two-channel R/C system will handle installations, or whenever a high- AIRCRAFT MODEL PRODUCTS the steering chores. For inboard in­ nitro fuel is to be used. BOX 318, SCITUATE, MASS 02066 stallations, a hardware kit using all Priced at $495, the Damo FS-218 stainless steel hardware and including is currently available only from Mar­ keting Consulting Corporation AB, A 12-volt quick charger is supplied, a cable stern-drive system and an ad­ justable strut is available. Also in­ P.O. Box 241 11, S-750 24 Uppsala, as are fast-charge GE batteries. The Sweden. Write to them for their in­ receiver works directly off the motor cluded are a motor mount, cable en­ gine coupling, cable assembly, formation pamphlet, and be sure to battery to save weight. Two cells may mention MB. be disconnected for slower indoor rudder, arm, stuffing box, and teflon operation. The transmitter is a full liner. * * * 1000 MW; the system uses plug-in Sorry, we don't have prices, but Is one picture worth a thousand crystals for maximum channel utiliza­ they can be obtained at your favorite words? Hope so, cause all we have on tion. boat dealer, or direct from Steve these new O.S. and Super-Tigre en­ The actual speed is 29 MPH, using a Muck's R/C Boats, 6003 Daven Oaks gines, available or soon to be avail­ dyno-tested 05 motor. A gear ratio of Dr., Dallas, TX 75248. able from World Engines, are the pic­ 16/52 is used, driving 2-1/8 x 1-1/2 tures; little information. inch wide foam-rubber rear tires. Total * * * The O.S. 45 Marine R/V features a weight is 38.5 ounces. Have you ever tried to grow decals? Dykes ring and comes complete with The price is a tentative $240; check Larry Vance, 5066 Cindy Way, Las marine head, flywheel ana U/joint. your local R/C car dealer, or inquire Vegas, NV 89102, must have the The Super-Tigre is a Schneurle .60, direct from JoMac Products Inc., secret! At least he has been successful which will be available as a rear or 12702 NE 124th St., Kirkland, WA in making his Old Timer decal set side-exhaust engine. 98033. grow, with new additions, and better Other new goodies from the same prices. The original set, as reported in folks include a special mount for the * * * "Over the Counter" for May '77, has O.S. .60 Four-Cycle engine, and a Contrary to popular belief in some been expanded to include decals for heat mount for the O.S. 25 FSR. quarters, there are lakes and ponds in Dooling, McCoy, Champion, Ohlsson Interesting looking items from Texas; enough so that Steve Muck has 23, and other products . . . 23 varieties manufacturers of many other well- not had to give up R/C boating since in all, on 6 sheets (2 sheets of each known and quality products, but his move from California. In fact, his style) for only $7.50. This is about a you'll have to get the rest of the 102 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER thousand words direct from World Engines, 8960 Rossash Ave., Cin­ cinnati, OH 45236. Tell them M B sent you. * * * Ready for something new in R/C cars? How about an 1 /8th scale Sprint Car? An exact-scale fiberglas and aluminum body for Don Edwards' Sprint Car is now available from Auto Research, Inc., 1418 S. Central Park Ave., Anaheim, CA 92802. The nose and tail pieces are molded fiberglas, and the main body is formed aluminum, similar to the full size car construction. The body parts sells for $37.50, plus postage. California resi­ dents don't forget the 6%. Note that this is for the body parts only, and that S the chassis or any of the running gear THE (714) 547-3055 or detail pieces are not included. * * * PEClALlST I recently received a modern form THE ONLY RADIO SYSTEM LIKE IT of keel-hauling for saying that I didn't FULL 8-CHANNEL · ELECTRONIC TRIMS • METAL OPEN GIMBAL · FRONT PANEL really care for the name of a certain CONTROLS · VARIABLE DUAL OR EXPO­ airplane. Well, there are very probably NENTIAL RATES · ELECTRONIC MIXER OP­ complete classes of modelers out there TION · 3 VARIABLE MANEUVER BUTTONS · who won't care for the name of this SERVO TRAVEL ADJUST & REVERSE · AUX one: R/C-56. But as Dirty Dan points RUDDER CONTROL OPTION · ESV BATTERY out: “ Hey gang, even if it is pri­ MONITOR · MADE IN U.S.A. marily intended for some other type of cMILLCOTT model . . . if it does a good job for MILLCOTT CORPORATION you, use it. Keep an open mind." 1420 VILLAGE WAV. UNIT E Actually, R/C-56 is not intended for SANTA ANA. CAUFORNIA 92705 radio control models only, and its name was probably conceived back in some laboratory. It was originally introduced to us a super-sticky for an threaded end of a nylon clevis where Fourmost Racing Products can't unusual gluing job; that of joining the it mates with the wire rod, very effec­ boast of the largest product line in the very dissimilar materials of which tively holds it from coming loose. hobby. But it can boast that all of its canopies and fuselages are made. It There must be many more plastic-to- products are exclusive, high quality, does this well; creating a firm, flexi­ something-else gluing jobs that this and certainly make life easier and ble bond that withstands shock and glue will handle better than others more pleasant for modelers. It has just vibration. we are now using. announced two new products, neither Lately, I have discovered other uses It is non-toxic, goes a long way, and of which has appeared before in just for this adhesive. Nylon and plastic comes in handy 4-ounce bottles with this form. exit guides, and wing tip skids, such applicator spout. Look for it down at One is Cockpit Coaming, extruded as those available from Goldberg tne hobby snop. For further literature from flexible black vinyl material, models, always had a way of getting and data, write to Wilhold Glues, Inc., pre-shaped to fit around corners. Just loose or lost for me because tne ad­ 8707 Millergrove Dr., Santa Fe the thing for that new one or two-holer hesive did not "take" well. R/C-56 Springs, CA 90670. you are building, or even that old one now cures that for me. A drop on the * * * you've been flying around. It comes in

MINIATURE Send application to: AIRCRAFT MACA COMBAT Wm. “ Moose" Allen ASSOCIATION 418 Fairmont Dr., $5.00 Annual Fee DeKalb, Illinois 60115

Name AM A No.

Address Club Affiliation

Town State Zip

Phone

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 103 your copy to: "Che Hobbies", 10900 CUSTOM R/C CAR COMPONENTS Eastwood Ave., Lennox, CA 90304. Tell them Cindy sent you! INC. ♦ * * • NEW HRE 1500 RS $169.95 It's a MIRACLE! Sounds kinda like Prather Products has gone into the This new chassis has adjustable front and rear roll laundry detergent business, but that is suspension for better performance on all track surfaces. not so. Its Miracle Micro-Balloons filler is called that because it does everything you can possibly ask from a filler. It is smooth, sands easily, comes in a convenient easy-pour con­ tainer, and is snow-white in color. Mixed with your favorite polyester or epoxy resin, epoxy glue, or even old- fashioned so-called 'model airplane glue', micro-balloons will adhere well to all common construction materials. Applied with forethought and discre­ tion, the mixture will not add appre­ ciably to the gross weight of your model. Miracle Micro-Balloons are available only in a 42 gram (1.5 ounce) container at $1.98. • HRE 1000 CHASSIS KIT $144.95 Another new release from what most of us erroneously think of as a Basic chassis kit has performance where it racing products manufacturer, is of counts: most use to the sailplane crowd. It 1st 1975 Roar Nats, Expert Oval is Double-Back Tape Squares, in one- 1st 1975 Winter Nats, Expert Road inch pieces, using a strong 3M ad­ 2nd 1974 Roar Nats, Expert Oval hesive. They are reported as great A ll metal chassis parts, aerospace quality, kits for holding servos, receivers ana bat­ less body, engine, fuel tank and radio. teries in gliders, or for holding any hardware in your airplane or field box. WRITE FOR FREE BROCHURE Tape Squares come ten to the package HRE Inc., P.O. Box 4658, Irvine, California 92716 for 980. And while the following is not about a new Prather Product, it is news, two sizes, 3/32 and 3/16 inch, two higher than normal "C " engines; and you never read it anywhere else feet of either size for $1.95. come packed three-to-a-box, com­ before. As any one who ever used one Second item is a slip-on Strut Fair­ plete with igniters. will verify, once you have used a ing, also of extruded vinyl, in two For further information, contact Prather Drill-Tap Jig to mount an en­ sizes, 3/32 and 1/8 inch. This should Centuri Engineering, Box 1988, gine, you will never do it any other also serve well to dress up those scale Phoenix, AZ 85001. way . . . not if you are interested in and semi-scale birds. The Strut Fairing * * * perfectly located and tapped holes is packaged in two 23-inch lengths, that allow you to mount your engine at $2.25 for each size. Is something lacking in your rubber powered flying lately? Maybe what securely, and where you want it, with­ Look in your hobby shop first. If out having to resort to elongated not there yet, write to Fourmosl you need is our Cindy and her "Rub­ ber Power" T-Shirt from "Che Hob­ holes. The real news is that the Jig Racing Products, 4040 24th Ave., designated for use with the K&B 15 is Forest Grove, OR 97116. bies", to put some more winds in your motor. also of the proper spacing for the * * * Well, too bad, Cindy is not avail­ newer Rossi and Cox 15's . . . And like all the higher RPM racing en­ Engines for the big ones, rockets, able. But the T-Shirts are, for yourself and your own pit-person, as are a gines, these will perform better if that is, are now available from Centuri. mounted securely. It has just announced new "Super-C" multitude of other hard-to-get items designed exclusively for the competi­ A last bit of news, not good, is that single-stage and booster engines, de­ Prather Products has temporarily dis­ signed to boost big model rockets tion free-flighter, both rubber and power. continued production of Pylon Racing higher and straighter. They are said to Props, due to scarcity of the high- be especially effective with Centuri's Wood, covering materials, glues, engines and accessories, rubber, quality wood necessary for their Super Kits, and its Space 1999 Eagle manufacture. More news from them, Transporter. winders, reels, kits, etc. If it is free flight, chances are that you will find and from MB, on that subject as The "Super-C's" are a development soon as the problem is overcome. of the popular "C" engine, and pro­ it all from this one source, which also promises one-day shipping service. Can't wait for news about the props vide a higher initial thrust "spike" at or any of its other fine products? liftoff, to stabilize the larger rockets The shirts are available in small, Check with Terry at Prather Products, early in their flight path. The CR-3S medium and large, in your choice of 1660 Ravenna Ave., Wilmington, CA single-stage engine may be used with orange or yellow. The price is $5.00, 90744. most rockets which already fly well plus $1.00 for postage . . . plus 6% if with a standard C6-3, while the C5-OS you live in California. The prices for * * * is recommended for most staged the rest of the goodies are too Engines for Marine Steamers, in rockets. numerous to list. You'll get a catalog small sizes, are now available from "Super-C's" are priced slightly with your T-Shirt, or send a SASE for Polk's Model-Craft Hobbies. They are 104 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER WRAM SHOW 1977Γ\ February 26&27 Westchester County Center, White Plains, N.Y.

available in two- or three-cylinder ver­ reactions, particularly in our capacity like a pioneer!) is so strong that it sions, and are made with cylinders as chairman of the R/C Contest Board. seems inevitable for the Contest Board cast from zinc alloy with brass liners. Please let us know what you think of to be faced with establishing some Both models are equipped with gears, the ideas presented. Remember, this kind of AMA-legal maximums on size, which allow two speeds forward and will be a proposal for the 1980-81 weight, and power. two reverse. For R/C applications, rulebook. Canadian modelers are talking the gear mechanism can be handled about a single limiting factor of by any normal servo. MORE ON BEEG SCALE! weight, 35 pounds . . . no limits on The dimensions for the two-cylinder The current rise in popularity of size or horsepower (or displacement). are; 4.1 inches long, 3.5 inches high, large scale models (having flown our Next year's Las Vegas extravaganza and 2.4 inches wide. The three-cylin­ 1/4-scale Gipsy Moth in the 1961, will call for close-to-scale models of der differs only in length, being 5.1 1965, and 1966, Nats makes us feel aircraft that have competed in aero- inches long. Completely equipped with boilers and burners, the two-lunger is priced at $219.95; the three at $299.95. NATIONAL SOARING SOCIETY From Polk's Model Craft Hobbies, NSS No. MEMBERSHIP APPLICATION Inc., 314 Fifth Ave., New York, NY DUES ARE AS FOLLOWS: 10001. · Name: . Individual: $10.00 Family: $15.00 (Any Senior or Open AMA member and any of his immediate family who are also Address: AMA members.) Remotely .... Continued from page 16 Junior: $5.00 (Any Junior AMA member) in new interests; Advanced . . . an Each member or family automatically upper level for the more skilled; receivesa subscription to the society pub­ Expert . . . the real training ground Phone: lication SAILPLANE, starting with the dues an for tomorrow's Master; and Master. .. first issue published affer payment of AMA No. LSF No. the pros who have demonstrated their dues and continuing thereafter through right to be there. the membership year. ''Say . . . have you seen the new kid Membership type: Dues are payable prior to December in the club fly that ole' Falcon 56? 31st of each year for the ensuing year. Dues In the event a member joins during . . . Anyway, it is simple!!!" M AIL TO: the dues year, he shall submit dues as Donation ____ follows: between Dec. 1 and June 30, Horrace D. Cain Dr. Stan Pfost, President AMA 539 NSRCA 281 full annual fee; between July 1 and Nov. 2110 Venetian Way Total Winter Park, Fla. 32789 30, one-half the annual fee. Members 525 Weidner Rd. joining during December of a year shall Buffalo Grove, IL 60090 New membership ( ) Renewal ( ) also be members of ensuing year. Obviously, we're interested in your JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 105 batics. T h e minimum size limits are 800 sq. in. monoplanes or 1000 sq. in. SAIL CONTROL WINCHES biplanes. Weight limit is 10 kilos, or ■ 22 pounds, with no maximum limits on overall size or engine power. It would seem that our concern for super-powered big engines is a little premature. Most everyone who is examining the possibilities or is in the process of building a scale biggy, is looking for engines capable of turning big props with plenty of torque, at low W-2 . . . $119.00 RPM's, which is a healthy attitude. It could be that the very nature of the • Custom R/C design for all boat sizes · Power - 40 in. lbs. «Travel requirements for large scale models time - 5 seconds »Voltage · 4.8-6 (W-1) «Size -2x2x5 inches. will self-prevent any desire for high- The Probar W-1 is mechanically operated by a separate, neutralizing revving monster engines. servo. The Probar Propo W-2 is designed to plug directly into the receiver, All of this leads us to the following and requires no extra batteries. Specify Kraft, Futaba, or no connector. letter, from John Preston, Falls Church, Both winches are fully assembled and tested, ready to install. AH mounting Virginia. hardware, switch pushrod (W-1 only), and winch arm blank are supplied. "I read with interest your comments in the November '77 MB regarding STAINLESS STEEL HARDWARE: MISCELLANEOUS ITEMS: Turnbuckles, Chainplates, Goosenecks, Sheet exit guides, 3owsie, Mammoth Classic Scale. I would like Boom vang pivots. Pad eyes, Tangs, Rudder posts. Mast head to offer you my thoughts and in return, Deck cleats, Boom cleats. Rigging wire, fitting. Dacron sheet line. try and solicit some information on Deafer inquiries malted. how to run a 1 /4-scale class in a future PROBAR DESIGN P.O. BOX 639 ESCONDIDO, CA. 92025 contest. "I was the assistant CD at an all­ scale contest held by DCRC at Beal- ton, Virginia in September. I have volunteered to CD a repeat of this ^TTltO B S DO HAVE M O R i T ^ event on September 23 and 24, 1978, and would like to include an event for f t lC JOIN THE * 1/4-scalers. As a result of the presence AMERICAN MODEL YACHTING of a Nosen Mr. Mulligan at our 1977 contest, there is a surge of interest in ASSOCIATION large models in the Washington, D.C. SEND $5.00, YOUR NAME AND ADDRESS TO: area. This model, which was built by BOB CRYSLER, 2709 SO. FEDERAL HIGHWAY Kirby Crawford, of NVRC, was too large to compete under Sport Scale DELRAY BEACH, FLORIDA 33444 rules, but we used it for judges' warmup flights and in a model air- show which preceded a full-scale airshow on the second day of the contest. The enclosed photograph does nothing to show you its realism in flight, which scores an A + in all departments, including sound. Pow­ ered by a 1.6 cu. inch ignition AMYA chainsaw powerplant, it tips the scales at 23 pounds. Hardly the MCS model that Le Gray and you had in mind! "For our contest in 1978, I would like to add a class for 1/4-scalers which would permit the Paul Bunyon engines, but like you, I would get weak at the knees if we had to also include 2 CARR SAILS cu. inch Schneurle-ported glo en­ gines. What I had in mind was to 7608 GRESHAM ST. permit any model which is +5% of 1/4 scale and use Sport Scale judging SPRINGFIELD, VA. 22151 rules, but raise the weight limit to 25 pounds and the displacement for STANDARD ON ALL CARR SAILS Finest American-made DACRON sailcloth. ignition engines to 2 cu. inches. A 60 Vinyl, press-on numerals and insignia. Heat sealed edges eliminate fraying glo engine powered big one could Coated, stainless steel jibstay installed. enter either 1/4-scale or Sport Scale if Rolled-edge grommets in tack, clew & head. Bolt-rope mains'l luff mast attachment it met the 15 pound weight require­ Santa Bartara ...... $30.00 10-Rater ...... $30.00 ment that currently exists. The em­ East Coast 12-M eter...... $30.00 50/800 (M-class) ...... $30.00 36/600 ...... $25.00 Internat. A-class ...... $35.00 phasis in flight judging will be in West Coast 12-Meter ...... $30.00 Star 45 $30.00 realism. Particularly in realistic speed. Vanguard “J"-boat ...... $40.00 T&A Petrel ...... $30.00 "If you see fit to print this letter, I Scale vessels, special purpose boats, one-of-a-kinds: Write for a quote, and for our 1975 Brochure and Used Saits List. would like to ask any of your readers who may have thoughts on 1/4-scale 106 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER *Realistic r/c yachts

/ i l ______/ ______i z — ______i

Mail order only, no dealers or distribu vortex Model Engineering tors. For illustrated brochures describ Department MB ing all of our model yacht products 210 East Ortega Street send S1.00. Santa Barbara, CA 93101

rules to please contact me with any McCullough, c/o Sig Mfg. Co., Monte­ suggestions they may have. zuma, IA 50171. “For your information, Kirby's Mr. HOTMAC POKER Mulligan was constructed from a The Waco, Texas Heart of Texas modified Nosen kit. In the entire Miniature Aircraft Club (H.O.T. fuselage, balsa was replaced by white M.A.C.) successfully concluded its IENDSH1P SLC pine. Engine vibration required a Tenth Annual Fun Fly contest back in SCHOONERS, STAR 45 BOATS Lexan windshield, and steel engine August of 1977. Though this report is a cowling attachment brackets. Kirby little late, due to space problems, the Radio-Contr oiled cannibalized an $80 chainsaw for the ideas for fun-fly events don't become Fiberglass Sailin} Models motor, and did his own machine work dated, so we're bringing them to you on a Taig micro-lathe to modify it for now. Jim Smith, a HOTMAC member “SB aircraft use. Covering is Permagloss from Waco, describes them for you. Coverite, and radio is a Kraft KP5C "The format of the Summer Fun Fly with KPS-15 servos. No ignition has contributed to the popularity of shielding is used, other than an this contest. The events flown are aluminum plate fitted over the entire designed to appeal to both the experi­ David M aiiiwuHng firewall. enced and the novice flyer. A luck “ My own 1/4-scale Tiger Moth, factor is introduced, which in effect, -W b OX5SAD£PTA rtePHAM.W.0219 which will be constructed to the MCS weighs the end result of point tabula­ to fly under the Limbo line. If he is concept, is still sitting on the drawing tion. The three events flown are: Short successful in flying under the line he is board waiting for me to quit photo­ Field Takeoff, Limbo, and Pokerhand given 500 bonus points. Should he not graphing other peoples' airplanes and Spotlanding. be successful in his attempt, 500 writing to editors of magazines!" "The Short Field Takeoff event is points are deducted from his short Sincerely, scored bv erecting a 6 foot high paper field takeoff point total. John D. Preston mache ribbon. The runway is marked "The landing area is marked off 7012 Elvira Court off in one-foot increments to 100 feet. into five spaces and titled Ace, King, Falls Church, VA 22042 Point scoring is tabulated for each foot Queen, Jack and Ten. The contestant If you do write to John, please clue distance from the barrier. A minimum has five landing attempts to land in us in with a xerox copy. We are of 1,000 points is allowed when the an area that would give him the best interested in gathering data on this plane clears the barrier. A greater pokerhand. Should he land on the subject, and will make the better number of points is allowed for a runway, and miss any of the five portions of it available to our readers. successful takeoff for each foot closer designated card areas, he is allowed Of course, it goes without saying, that to the barrier. The same 6 foot barrier to draw a card from a deck of another copy should go to the Scale is used for the optional Limbo event. ordinary playing cards. Point scoring Contest Board Chairman, Claude The flyer may elect, at his discretion, is allowed, not only for each caraj JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 107 1977 INDY UNLIMITED: WIN WITH THE WINNING COMBINATION 1st, 3rd, 6th, & 8th OF FIRST 10 OCTURA WING-DING PLUS OCTURA PROPS & HARDWARE OUT OF 124 ENTRIES (Overall winner 4th year in a row) 1977 IMPBA ANNUAL REGATTA: 1st in Class E Straightaway 1st in Class F 1/3 Mile Oval 1st in Class E 1/3 Mile Oval 1st in Class E M ulti 1st in Class F M ulti 1977 NAMBA NATIONALS: A ll but one of the winners used Octura Props, most all used Octura Struts, Rudders, Etc. M ulti: 1st in Class X 2nd in Class X 1st in Class B 2nd in Class B S E N D 50< FOH CATALOG AND PRICE LIST 2nd in Class A 7351 n. Hamlin Ave. Plus! New N AM BA Oval Record OCTURA MODELS Skokie, III. 60076 of 1 min., 13.4 sec.

Whiskey Club, sometimes called the ‘W Club,' composed of CB operators who illegally use the single sideband mode of transmission. ' "These CB operators are organized into state Whiskey Clubs which employ a system of operator Identification num­ bers consisting of the letter ‘W’, pre­ ceded by a number representing the particular state's order of admission to the union and followed by the individual member's personal number,' the FCC order said. “For instance, it said, members of the Kansas Whiskey Club use Identifications with a '34W' prefix, adding that Runyan apparently uses the identifier of '34W1 "In addition, the FC C said, the Whiskey Clubs operate radio transmitting equip­ ment on frequencies above those as­ signed to CBers by the FCC, apparently using equipment not approved for CB use. ' “It further appears that rosters of Whiskey organizations identify operators by first name, city and Whiskey number instead of commission call signs,' the complaint said. but also for various pokerhand com­ are still catching hell from the press. ' "Thus, it appears that this number binations such as straights, flushes, It's a little difficult for us to side with assignment scheme enables members and etc. the newspaper's victim in this case, as to identify each other over the air, while "The points accrued by each indi­ a certain element of the Garbage Band avoiding detection by the commission by vidual contestant are converted to has had telling and senseless effect on concealing their identity and station checks for Contest Dollars.This many a radio controlled model. location from the commission.’ 'Money' is used to bid on merchandise The latest Associated Press story "The complaint against Runyan was a prizes in a Country Store type auction. comes out of Washington, and we major step in a campaign by the FCC "The Auction is -actually the high quote from a local newspaper against illegal CBers, mainly those who point of the Contest. Fierce competi­ clipping: operate high-powered illegal equipment, tion develops in the bidding, and it is “The Federal Communications Com­ which interferes with television and other not unusual to see a half-dozen props mission has cracked down on the al­ communications." sell for $2,000.00. The Contest is leged leader of the CB Whiskey Club', limited only by the imagination of the which the FC C said promotes nationwide Lack of this kind of bad press sponsoring club. The requirements for use of unauthorized citizens band radio continues to put licensed radio control working personnel are minimal and equipment, channels and call signs. operators on the good side of the FCC. the amount of fun to be had is "The commission served notice on Let's hope we continue to stay there. tremendous." Jesse D. Runyan of El Dorado, Kan., to While we're on that general sub­ show why his CB license should not be ject, reference is made to the January WHISKEY WITH A GLITCH revoked and why his license as an 1978 issue of our competitor, "Model Typically, newspapers don't con­ amateur radio operator should not be Aviation", the supposedly member- sider anything to be news, unless it's canceled. only AMA magazine which is also bad news. Fortunately for our hobby, available for over-the-counter sales in there hasn't been anything bad "Runyan was given 30 days to respond hobby shops. enough to print lately . . . thud, thud to the order and ask for a hearing if he A report on the Frequency Commit­ (knocking on wood, but it happens to desires. tee's efforts begins on page 57. Of be a soft piece of 1/4 by 3 contest “The FCC said ‘it appears that Runyan particular interest, is a discussion on balsa). On the other hand, the CB'ers was founder, member and leader' of the R/C frequency monitoring, which be- 108 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER CYANOACRYLATE SUPER STARS ADHESIVES HOT STUFF NEW HOT STUFF ORIGINAL CLEAR Formula = fc\JÆ LINEE I HS-1 350 PER UNIT HS-4 24°o PER UN|T j-500 .50 PER PK /v^ EXCLUSIVE • 113.4 GRAMS 4 OUNCES · 18 INCHES OF * FORMULA!! ★ · 1 4.2 GRAMS (SINGLE BTL) BLUE INSTANT ★ · 6 INCHES OF Control Drop (TWO 56.7 GRAM BTLS) CONTINUOUS TEFLON ψ * ADHESIVE ★ TEFLON APPLICATOR TUBING • 12 INCHES OF Control Drop Control Drop FOR COMPLETE DETAILS: ★ · COMPLETE INSTRUCTIONS APPLICATOR TUBING APPLICATOR TUBING SEE R/C Modeler SEPT 77 FOR ALL HOT STUFF FROM THE SHOP ★ HS- 2 7 GM BTL 4 9 5 • 2 SETS OF INSTRUCTIONS 14.2 GRAMS (SINGLE BTL I n . 1 ADHESIVES.10 PKS/CD rWtf eliite C ii*f p o b o x 1935. ARLETA. CA 91331 PHONE (213)899-2301 HS-5 495 ★ ★★★★★★★★ ★"* gins on page 58 and continues on page 62. Anyone who has the skills and Refractive equipment required to carry out moni­ 3” Letters & toring of the "Guard Band" fre­ Striping Tape Numbers quencies (ranging from 31.995 to 42.005), which are being examined by — Self Adhesive the Frequency Committee, could be — Diffraction Grating doing all radio controllers a great - Peel and STICK-ON Any favor. Discovering if the frequencies Smooth, Gean Surface listed are truly "dead areas" could -In a Variety of Sizes and Colors lead to special effort by the Committee ▼ TAPE DISPLAY in requesting that the FCC assign them No. 1701 - $307.62 •R tF R A K IV t HEADER RACK for radio control use. · WITH STAND ANO J4 HOOKS ■ J OF I ACM H i t A COLOR 1114» F O R M E D . Ho 1702 S 102.54 Q UICK R EFILL P L A S T IC ψ • ONI O f f ACM S lit A COLOR IM I DISPLAY 1 3 "X 22" APPLIED DESIGN CORP. fo r Will or Counter 7;« PENN STREET EL SEGUNDO. CA 90245

JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 109 of fuel! In fact, the area treated with K-2R seemed to be not only cleaned, but ap­ VES-SIR. YE8-8IR. THREE BAGS FULL!^ peared to be bleached. The K-2R seems to have the ability to draw the fuel out of the balsa. This experience has con­ vinced me that the use of epoxy and plastic bags to enclose the receiver and batteries is well worth the trouble. It has also proven the benefit of a pre-flight check. If I would have pre-flighted the plane, I may have found the small cut in WALT MOONEY NOW OFFERS 3 BAGS OF PEANUT SCALE PLANS the fuel line which allowed the fuel to get ALL WELL TESTED DESIGNS, AT ONLY fS.OO EACH into the fuselage area. EACH BAG FEATURES FOURTEEN PEANUT PLANS, "K-2R comes in spray can and tube ONE OTHER, PLUS PHOTOS AND INFORMATION forms. I would recommend the spray can because of its ability to get to areas which SEND *1.00 FOR COMPLETE LISTING ANO SAMPLE PLAN TO! could be hard to reach by hand." WALT MOONEY, 29I2CABRILLO MESA DR MODEL SHIPYARD SAN DIEGO, CALIFORNIA 92123 Our search for somone to head up a feature column on the interesting hobby of static and operational model BENDIX WINNER ships continues. The building of VINTAGE R-C FLANS model ships had obviously been with PAUL MANTZ P51 us much longer than model airplanes, however, the majority of ship models have, in the past, been of the static type; ornamenting desks, tables, and 9 FT. WING SPAN mantlepieces. In the last century, free- ALL RIBS 8 FULL FORMERS SHOWN ON PLANS 11 running sail and power boats have be­ PLASTIC ENG.COWLS | 9.90 PR. CLEAR GUN BLISTERS ) 6.60 PR come more popular, and in the past 10 years, model ships have become a a large plan sheets — Plans $14.95 noticeably "visible” hobby, as clean MACHINE CUT BALSA .0 k9 6 f t . WING SPAN MODEL PBY-5A and silent sail and electric powered SCALE-LIKE PROFILE STUNT ENGINE COWLS | 6.50 PR. R cT lS $ 10 .9 5 radio controlled scale model boats AT YOUR DEALER $5.50 GUN BLISTERS > 4.50 PR App ||.5Q POSTAGE CATALOG-OVER 50 PLANS'ψ' 5 0 i DEALERS WRITE cruise around public parks, lakes, OR ORDER FROM: harbors, and man-made lagoons. HOBBY HIDEAWAY, DELAVAN, IL. WORLD X) WIDE We have run several columns on 309-2A4 7389 61 7 3 A SID MORGAN scale ships under the "Model Ship­ Γ3Ι57 ORMOND.BELLEVILLE, MICH.48lllu.SA. yard" title, and each time it has ap­ “I had been told by some fellow peared, we have received enthusiastic Workbench . . Continued from page 6 modelers about a product on the market reaction through the mail, phone calls, which would draw out fuel from fuel- and personal contact. So again, we batteries, and receiver, and filled the soaked balsa. I d ecided to give it a try. call your attention to the fact that we fuselage with cornstarch to soak up as I went to the store and purchased a are still interested in finding someone much fuel as possible. At this point, my spray-can of K-2R spot remover. I who would like to prepare monthly biggest concern was with the receiver sprayed the interior of the fuselage and, or alternate month columns on model and batteries. I removed them from their as per instructions, I let it sit for two ships for pubication in Model Builder. foam and plastic jackets. Close examina­ hours. I then removed the K-2R residue, If you are interested, or know some­ tion revealed only slight traces of fuel, which had turned to a white powder, one who might be, drop us a line. which could be removed with a little using a paint brush and a small hose In the meantime, here's an inter­ wiping. The plastic jackets had done connected to a vacuum cleaner. esting little tidbit gleaned from the their job well. I then turned to the job of newsletter of the Ship Modelers Asso­ removing the fuel from the plane." "Upon careful examination of the fuel- ciation, located in the Orange County COMES THE HANDY HINT. . . soaked area, I could not find any traces area of Southern California. No credit

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

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 of S3.00 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. ______Signed ------110 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER 9 CLASSIFIED ADS ADVERTISERS INDEX Non-commercial (personal items) Rate is 25 cents per word, with a minimum ot $3 00 Ace R/C, Inc...... 77 Commercial Rate is 40 cents per word, with a minimum of $5 00 No mail-order discount Aero Modelling Enterprises ...... 88 house ads knowingly accepted No advertising agency discounts allowed Agnew Model Propulsion Systems .108 All ads are payable with order, and may be for any consecutive insertion period specified Aircraft Model Products ...... 102 Name and address free, phone number counts as two words Send ad and payment to Applied Design Corp...... 109 MODEL BUILDER Magazine. Classified Ads. 621 West 19th St.. Costa Mesa. CA 92627 Astro Flight, Inc...... 75 Boomerang Man ...... 98 Cal Aero Models ...... 80 DECAL REPRODUCTIONS: N.A.A., O&R. CONTEST WINNERS. 1/2-A Country Boy Cannon Electronics ...... 83 Forster, Drone, Doolmg, Super Cyke, Cham­ Kits and 1/2-A Okie Bird Kits, $9.50 each Carr Sails ...... 106 pion and others 23 varieties on 6 sheets. Postage paid two kits or more Mix or Classic Era Model Plans ...... 86 $7 50 p.p , Larry Vance, 5066 Cindy Way. match Dealer inquiries invited Clemcraft, Cloudbuster Venture ...... 86 Las Vegas. Nevada 89102 P.O Box 524. Sand Springs, Okla 74063 Coverite ...... 96, 100 Cox Hobbies ...... Cover 6 Black Knight and New Red Knight Spark FLYING PAPER AIRCRAFT New books each Craft-Air ...... 93 Engines again available from stock F.F. & containing 18 cutout replica paper models Jim Crocket Replicas ...... 98 RC! Accessories and owner service. Write that fly. No glue required $2 73 each post­ Davis Diesel Development ...... 80 Chandler Engineering, 7858 Farralone paid. Specify Volume I. II, or III. L.B.J. Enter­ D & R Products ...... 102 Avenue, Canoga Park. CA 91304 prises, Dept MB. P.O. Box 180. Getzville, Du-Bro Products ...... 74,81,97 New York 14068. Electric Championships ...... 92 AERO ERA Peanut Plans now introduces Fibre Glass-Evercoat Co., Inc...... 95 new Grapenut Scale! Catalog for stamp COMBAT FLYERS . Get in the air fast with a Flight Systems, Inc...... 82 Aero Era, 11333 N Lake Shore Dr.. Me- CORE HOUSE plane. Almost-Ready-to-Fly Flying Scale Models ...... 94 quon, Wl 53092 Gotcha — $26, Axe — $22. Send S.A.S.E. for Flyline Models ...... 85 complete info and details. The CORE Fox Manufacturing Co...... 72 MODEL AIRPLANE PLANS. Peanut, Walnut. HOUSE. Box 300A. R.D #2, Palmyra, PA Carl Goldberg Models ...... Cover 3 Hazelnut. Rubber, Gas. CO 2. S.A .S.E. for list. 17078. Hi-Flier Mfg. Co...... 87 Modernistic Models. P.O Box 6974. Albu­ Hilbig Industries ...... 103 querque, New Mexico 87107 Hobby Hideaway ...... 110 HRE, Inc...... 104 Idea Development, Inc...... 73 UNITED STATES International Modeler Show ...... 91 · PATTERN JUDGES Jensen Tools & Alloys ...... 100 K & B Mfg. Co...... 2 j o i n USPJA ASSOCIATION Kraft Systems ...... 1 Kustom Kraftmanship ...... 87 David Mainwaring ...... 107 Majestic Models ...... 89 MOVING? SEND NOTIFICATION FIRST! Micro-X Models ...... 84 ^ A tta c h old label here ' _ Attach old label here Ί Midwest Models Supply ...... 101 NAME \ I Midwest Products Co...... 79 OLD Millcott Corp...... 103 ADDRESS ADDRESS Model Builder Binders ...... 88 (Please Print) Model Builder Products . 78, Cover 4 & 7 CITY I STATE ZIP | Model Rectifier Corp. 77,81,Cover 2 & 8 1 _ 1 L Attach old label here / Attach old label here Modernistic Models ...... 96 Walt Mooney Peanuts ...... 110 NAME Sid Morgan Vintage Plans ...... 110 NEW Octura Models ...... 108 ADDRESS ADDRESS Pacer Industries ...... 76 Pas-M-Co ...... 83 (Please Print) CITY STATE ZIP P.P.P.P...... 71 Probar Design ...... 106 Change of address notices must be received one month before date of issue that new John Pond OT Plans Service ...... 85 address takes effect. For prompt service, old label MUST be attached. Post office will Proctor Enterprises ...... 89 not forward copies unless you pay extra postage. Duplicate issues cannot be sent. R/N Models ...... 100 Robinaire ...... 86 MODEL BU ILD E R , 621 West Nineteenth St., Costa Mesa, Ca. 92627 Satellite City ...... 109 Sig Manufacturing Co...... 3 line is given. this opportunity to wish our readers a Smith Plans ...... 83 WHY IS A SHIP A SHE? happy and prosperous New Year. Sonic-Tronics ...... 99 "A ship is called a she because there's There have been times, particularly Southwest Modeler's Show ...... 70 always a great deal ot bustle around in the first few years of our existence, Sterling Models ...... Cover 5 Superior Aircraft Materials ...... 84 her. .. because there’s usually a gang when it was questionable that we Vintage Aero ...... 97 of men around . .. because she has a would make it to the next January VL Products ...... 98 waist and stays .. . because she takes a issue. However, through the support Vortex Model Engineering ...... 107 lot of paint to keep her good looking .. . of you who subscribe or buy the Weak Signals R/C Club ...... 90 because it's not the initial expense that magazine over the counter, the sup­ Williams Brothers ...... 89 breaks you, it's the upkeep . . because port of hobby shop owners who have Windspiel Models ...... 96 she’s all decked out... because it takes promoted its sales, and most of all, the WRAMS Show ...... 105 a good man to handle her right . . . be­ support of members of the industry, 77 Products ...... 85 cause she shows her topside, hides her who have pumped life-giving cash bottom, and when coming into port, al­ flow through its account books in ex­ MODELS ways heads for the buoys. Also, she change for display advertising space, needs an ensign with the 'jack'." we're still here and going strong. And BUILDER ONCE AGAIN. . . for this we offer our sincere thanks 621 W. 19th St., Costa Mesa, Ca. 92627 For the 7th year in a row, we take to all of you. · JANUARY 1978 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 111 FULL SIZE PLANS SERVICE No.8772 SBD "DAUNTLESS" $2.50 No. 2772 SEALANDER II $3.00 Including reprint of construction article Designed for C/L Carrier or Sport Scale. Twin engine R/C seaplane based on Gee Uses .40 size engines. By Roland Baltes. Bee floats. (2) 20-30 eng. George Wilson. (if any) No. 8773 TYRO A /2 NORDIC $2.00 No. 277-O.T. BERLINER JOYCE $6.00 Ail-balsa, Jedelsky winged competition Scale military bipe from 1935 mag. Span No. 1781 STINGER $4.00 glider for FF beginners. W. Langenberg. 6 ft. Great for R/C assist. Donald Evans. Proven Form I R/C Pylon racer. All built-up wood structure. George Baynes. No. 877-O.T. PB-2 $6.00 No. 2773 FOKKER TV $1.50 Payload gas model winner from Aug. '38 Profile scale WW I l-twin engine (.049) C/L No. 1782 J.C. YATES 'MADMAN' $3.00 M.A.N. Spans 8 feet. By Thracy Petrides. Half-A R/C (18% reduction) version of bomber. Span 34-1/2". By Mike Keville. famous C/L stunt ship. By Floyd Carter. No. 7771 OS2U "KING FISHER" $5.00 No. 2774 OFFSPRING $2.00 No. 1783 FOLKERTS SK-3 $2.00 Sport R/C Scale of famous WW II Navy Excellent A/1 Nordic glider. All sheeted Winner of Model Builder's 1977 Peanut floatplane, 48" span. By Eliot Kimble. surfaces cleverly built. By Ron Roberti. contest. Flies 2 min. By Kurt Enkenhus. No. 7772 FLIGHT BOX $1.00 "Quick-Pit" field box especially designed No. 1771 CURTISS HAWK XP-23 $6.00 No. 12771 HEINKEL/BAKA $3.00 for Combat. Good for all. Rich Lopez. Two inch R/C scale of last biplane in Two WW II pseudo-scale 1/2A push-pull Hawk series. Much detail. Charley Smith. R/C twins. Ace foam wings. Ken Cashion. No. 7773 HOTBOX S1.00 Easily built design for new P-30 rubber No. 1772 SHOESTRING SLOW RAT $2.00 No. 12772 DH "HAWK MOTH" $3.50 class. Use plastic prop. John Oldenkamp. Semi-scale slow rat racer for .29 to .40 Superb rubber powered 1 inch scale (44" engines. Consistent winner. Bill Melton. span) cabin monoplane. By Bill Noonan. No. 777-O.T. NEW YORKER IV $2.00 No. 1773 KORLA PLANKTON $3.00 No. 12773 SCOUT'S PENNYPLANE $1.50 Frank Zaic's 1938 Stout Trophy winner, Lars Olofsson's 1976 FAI power model. Excellent beginner's indoor rubber stick also for Wakefield. Patterson & Northrop. Won 2nd in "76 Nats A Gas. Bob Stalick. trainer. Full instructions. Jerry Murphy. No. 6771 GIPSY MOTH $10.00 No. 177-O.T. SHERESHAW'S XP-3 $8.00 No. 1277-O.T. HURRICANE $2.25 Exact quarter-scale (7-1/2 ft. span) R/C Beautiful 10 ft. span twin-boom pusher. Earl Stahl's 33" span 1940 rubber pow­ of famous D.H. bipe. By Bill Northrop. Left and right wing plans. Phil Bernhardt. ered low winger. Northrop & Patterson. No. 6772 SC-1 $1.50 No. 11771 LI'L GEM III $3.00 Slow combat ship designed for easy parts No. 12761 DON QUIXOTE $6.00 Competitive 1/4 Midget R/C pylon racer. replacement. Foam wing. By Phil Cartier. R/C scale model of Polish homebuilt, 86" All wood construction. Austin Leftwich. span, pusher engine. Laddie Mikulasko. No. 6773 PARAGON $0.75 No. 11772 WEICK W-1A $2.50 High performance outdoor hand launch Unusual scale twin-boom pusher for CO2 glider, with D.T. stabilizer. By Ed Franz. engine. 24" span. By Walt Mooney. \ ”’" s t i c k " έ μ "V ä t t e r n s """ j Complete sets of pressure sensitive patterns No. 11773 PLUTO $2.50 No. 677-O.T. A LL BALSA G.M. $2.00 Easy-to-build profile stunt/sport/trainer All sheet balsa pylon-type 1939 gassy for I provide "printed wood". . . on your stock . . for .35 engines. 44" span. Dave Horvath. small 'C' engines, 48” span. Tom Laurie. I for selected MODEL BUILDER plans. Press ! all patterns for ribs, bulkheads, tips, etc., on No. 1177-O.T. INTERCEPTER $2.50 i proper thickness sheet balsa or plywood, O.T. .020 Replica of famous Carl Gold­ No. 5771 POLLIWOG $2.50 j and cut 'em out! No tracing, no transferring, berg design. 34" span. By Jerry Murphy. Easily-built pod-and-boom electric pow­ I no plans tearing, no inaccuracies. Just like ered single-channel glider. Jack Headley. j making up your own kit with printed wood. No. 10771 KRIER KRAFT $8.50 I "Stick 'em Pattern" numbers correspond to Large R/C sport scale model of famous No. 5772 GUS $1.00 j plan numbers. Order with plans and they'll aerobatic bipe, 70" span. By Ray Nugen. A typical stick-n-tissue rubber powered i be mailed together . . 3rd Class. Add 504 fuselage model, 24" span. John Walker. J per set to mail patterns 1st Class. No. 10772 YELOISE $1.50 I CALIFORNIA RESIDENTS ADD 6% TAX. Manhattan class indoor "cabin". V-tail, No. 4773 VOLARE A /2 $2.50 and plug-in wings. By Ronald Williams. Highly competitive 85" span Nordic A/2 No. 12711SP CURTISS-WRIGHT Jr. $3.96 Complex, but not difficult. Ron Roberti. No. 11731SP BIG JOHN the FIRST $6.96 No. 10773 VOLKSPLANE $2.50 No. 574-O.T.SP T-D COUPE $2.96 1-1/2" C/L scale model of popular home- No. 477-O.T. CLOUD CHASER $1.00 No. 674-O.T.SP RED ZEPHYR $3.96 built. 36" span, .15 eng. Vern Schroeder. This 30" span stick job from 1938 MAN No. 6741SP TRIXTER BEAM $2.96 is OT, FF trainer, Unlim. Bruno Marchi. No. 774-O.T.SP OUT Ό SIGHT $2.45 No. 1077-O.T. EUGENE II $2.00 No. 7741SP CURTISS A/12 SHRIKE $3.96 Streamlined, retract gear Wakefield, built No. 477-H SHRIKE- COPTER $2.00 No. 874-O.T.SP POWERHOUSE $3.96 and flown in 1940. Design by Ed Lidgard. Full-size parts and installation drwg. for No. 91074-O.T.SP BUHL PUP $4.95 TUcker's Jet Ranger-Shrike conversion. No. 1174-O.T. SP LANZO STICK $1.96 No. 9771 BOOMER $5.00 No. 11743 SP"C-QUELL" $3.96 A different, but efficient, twin-boom R/C No. 3771 WACO UPF-7 $4.50 No. 575-O.T. SP MERCURY $3.96 Standard Class sailplane. Bert Striegler. Stand-off R/C scale (1.8"=1’1 of one of the No. 776-O.T. SP BOMBSHE LL $3.26 prettiest Waco biplanes. Span 54'.’ R. Steely. No. 2781 SP DRAGONFLY $2.96 No. 9772 BLUE BOOMER $1.00 No. 277-O.T. SP BERLINER JOYCE $6.26 Clever all-sheet balsa twin-boom pusher No. 377-O.T. GAS CHAMP $3.50 No. 3771 SP WACO UPF-7 $8.60 for indoor or outdoor CO2. Ray Harlan. The famous 1940 "Eastern States Champ" No. 4771 SP "MISS ARPIEM" $3.26 by Russell Simmons, span 76". Al Patterson. No. 577-O.T. SP GLADIATOR $4.76 No. 9773 HI DUMMY $2.00 No. 8771 SP GIPSY MOTH $8.96 National record holder and 1977 USFF No. 3772 DIRTY BÉAVER $2.00 No. 7771-SP OS2U KINGFISHER $6.96 Champs winning Pay Loader. Ed Eliot. Hot Half-A combat ship for popular new event, by MB's C/L editor, Dan Rutherford. Price includes 3rd Class postage and reprint of building instructions (if any). Add 454 No. 977-O.T. "G U FF" $3.50 PER PLAN for 1st Class postage. Add 504 Walt Good's 1938 Class 'C' gas winner, No. 3773 KEITH-RIDER "S U ZY " $1.50 for overseas orders (except APO's). from '40 AT. Span 72". Al Patterson. Winner of first Nationals based Thompson Trophy Race for rubber scale. Tom Nallen. CALIFORNIA RESIDENTS ADD 6% TAX. No. 8771 CLEOPATRA $6.00 MODEL BUILDER PLANS SERVICE Scale-like, twin-engine R/C flying boat. No. 2771 SEALANDER I $3.00 621 WEST NINETEENTH ST. Span 98", uses .40 engines. Pavel Bosak. Single engine R/C seaplane based on Gee Bee float. 20 to 40 eng. George Wilson. COSTA MESA, CALIFORNIA 92627

112 WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! MODEL BUILDER Out Of The Skies Of History Chance Vought F4U-1A

Kit FS-36 Wing Span 36" $29.95 36" Stand-Off Scale R/C Model

About The Airplane: About The Kit:

The prototype XF4U-1 was first flown on March 29. 1940 The Designed eviesslv *or 2 channel R/C with plenty of room for |ust Corsair was to become the most important Naval Attack Fighter of W W about anv R/C up to 4 channel miniature units. Maintaining top quality II. and remain in production for 13 years, yet its first service trials had and «unple construction, (even the inverted gull wing), all Balsa and ended in failure in its chosen role. It did not reach maturity as a great Plywood parts are accurately die cut. Hardware Package including R/C fighting machine easily. It gave notice that it was to be flown and tested Hardware, full-size step by-step Plans and a flat finish Decal sheet for at all times like a true racing stallion, and was an airplane for inexpe Maior Gregory "Pappy" Boyington's Lulubelle as it appeared after the rienced pilots to reckon with. Because it was an advanced design— and Oct. 17. 1943 raid on Kahili Airfield. Solomons. Recommended engine had a new and untried high horsepower engine the Corsair required sizes for maximum performance .09 or .10. Minimal performance achieved many perplexing and difficult flight tests and service changes before with stock .049 or .051 Tee Dee. Diesel conversion of Tee Dee Engines assuming the role of the Navy's first line fighter. is suggested. The Chance Vought Corsair had a service life spanning two wars, performing every conceivable mission possible for a military flying ma chine. The Corsair had a 15 year life span of battle victories unequaled in the annals of aviation history Vought ceased production of the F4U 1 Model on Feb. 2. 1945 with the delivery of the 4.996th airplane In air-to-air cumbat the Corsair had destroyed 2.140 enemy aircraft with the loss of 189. The Corsair's distinctive whistling war cry. caused by the wing root inlets for engine air. earned it the nickname "whistling death" among the Japanese. The Corsair's most unique feature was the bent (gull) wing which was necessitated by the most powerful engine ever installed in a piston engined fighter, coupled with one of the largest props in the world. Thus the inverted gull-wing permitted the short, sturdy landing gear required STERLING MODELS · 3620 G ST PHILA PA 19134 If no dealer available, direct orders accepted — with 10*' additional for carrier operations. charge tor handling and shipping (60< minimum m US SI 25 The first combat unit to receive the Corsair was VMF-124 and the minimum outside U S ) first 12 machines arrived at Henderson Field on Guadalcanal or. Feb. 12. □ Catalog of entire line of airplane control line model kits R C scale 1943. On Feb. 13. VMF 124 dem onstrated their superiority over the and Trainer kits, boat model kits, accessories, etc 50« enclosed Wildcat by escorting PB4Y-1 Liberators all the way to Bougainville The □ Secrets ol Model Airplane Building Including design, construction following day they saw combat for the first time, and the inexperienced covering, finishing, flying, adjusting, control systems etc 25c Corsair pilots were badly mauled by some 50 Zeros. Two Corsairs, two enclosed Liberators, two P 40s and four P 38s were lost in this "Saint Valentine s □ Secrets of Control Line and Carrier Flying Including preflight Day Massacre” , but the Corsairs soon gained superiority over the Japa soloing, stunting. Carrier rules and regulations. Carrier flying hints and control line Installation instructions 25c enclosed nese which was never lost. VMF 124 was .subsequently credited with 68 No checks Only U S money orders or currency accepted kills against a loss of four aircraft and three pilots. Within six months, all Pacific based Marine Fighter Squadrons had been re equipped with N am e .. ____ the Corsair and the list of aces and the airplanes legend began to grow. A d d re s s ______City______S la te _____ Z ip ______The Cadet UT-1 is a Stand-Off Scale model surprisingly similar to most non-scale designs of a World War II training glider used by the of this size. And now with the interest in U.S. Armed Services. It’s a 2-channel sail­ Stand-Off Scale sailplanes rising, as seen at plane with a 62 inch wingspan that’s ideal the August 77 LSF Tournaments, you'll be for general sport flying and competition. (By seeing a lot of Cadets on the field. With its the way, we recommend using the Cox/ unique combination of performance and Sanwa 2-channel system.) nostalgic heritage, the Cadet UT-1 will be the In overall performance the Cadet UT-1 is only Stand-Off that really stands out.

CO X/SANW A RADIOS. AIRTRONICS KITS, COX ENGINES. WHEN YOU FLY WITH COX, YOU FLY WITH THE BEST. Cox Hobbies Inc /A subsidiary ol Leisure Dynamics. Inc . 1505 East Warner Avenue. Sama Ana. Calif 92705 IN THE BEST CIRCLES, IT’S fib e r *»ki\er

A PRECISION INSTRUMENT FOR THE DISCRIMINATING MODELER

Safe, Rear Draw-Bar Clutch Available in seven satin anodized handle colors: Precision, Instrument-Quality Materials silver, blue, red, green, gold, copper, violet. Complete set in fitted hardwood case: includes Strong-Holding Advanced Collet Design uber Skiver, together with two vials containing Non-Rolling Hex Cross-Section four No. 11, and one each of Nos. 10, 12, 15, and 2 0 ...... $14.95 Deeply Knurled, Non-Slip Grip Individual handles (specify color) $5.95 Long-Life, Stainless, Vial of 6 blades (No. 10, 11, or 15) $2.10 Surgical Steel Blades (No. 12 or 20) $3.30

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% sales tax. 621 West Nineteenth St., Costa Mesa, California 92627 When you buy atwo channel

Don’t miss the boat, compromise control of the glider or the car

Get an MRC system with open gimbal sticks

Don’t for one instant put all two channels in the same category. 772 comes complete with 2 servos, receiver. They may all be priced within a few dollars of each other . . . * ’ battery holder, switch harness. (At a small additional but there aren’t any within even a few features of our charge, select the servos best 772. Let’s start with the sticks. MRC’s 772 has open lited to your application). gimbals. They allow the control potentiometer to con­ nect directly to the stick arm without linkages. This means maximum response, virtually free of play at neutral. It's a must on more expensive, professional multi-channel sets . . . a rarity on most other two channels. We also make a full-size transmitter for solid feel and sure grip, not a toyish size designed to save us a few dollars. You'll also find Darsonval meter (not just lights) to monitor transmitter battery. And ITT Cannon "Centi- Loc"* gold plated connectors, as well as an external servo potentiometer adjustment for centering. You won’t find those on other two channel radios. Nor are you likely to see a combination of receiver features which include lead out wires for easy installation, double tuned RF front end and 1C circuit decoder. In short, we didn’t skimp on the 772, it's better all the way 'round. So whether you sail, fly. glide or take a spin, don't trust your pride to just any two channel. Buy the better one so you don’t compromise control. Ask your dealer to show you the 772 with open gimbals.

MODEL RECTIFIER CORPORATION/2500 WOODBRIDGE AVE., EDISON, N.J. 08817 In Canada: Borgfeldt Toys LTD., 3440 Pharmacy, Scarborough, Ontario M1W2P8 •A Registered Trademark of International Telephone and Telegraph Company