You’ve g o t th e d e s ir e to b e a C h a m p io n . control buttons and servo reverse 5 channel Helicopter sys­ switching. And serious fliers can also tem. Write now for complete appreciate our water and dust proof, dual technical data, because ball bearing S121 servos, modular RF the sky's not the limit any boards and direct servo control. more. All J-serics system* use quid The J-series Futabas change RF modules lor hand an are available in 4,5,6 and modulation select ioi 8 channel systems, plus a Dreams of conquering the skies are what makes a winning pattern flier. But even the best contest competitors know that you've also got to have the right equ ip- ment. Futabas J-series radio control systems are just that. Pure, state-of-the- art electronics with high-performance features like full programming capability, dual mixing circuitry, roll and snap roll lie hind die M Vs hack panel are 20 programmina control ■* (tines, including 2 dual rates and < non-linearity functions. The best Glow Plug and the best Fuel go together like a horse and carriage. You can’t get the best out of either without the other. For both — THINK K&B and be assured of consistent peak performance. K&B Glow Plugs with patented blow-out proof seals have proven their consistent performance over the years, and K&B FUEL is the fuel that has brought home more winners at the NATS and other prominent meets than any other fuel. KB-IL KB-IS (long reach) (short reach) K&B GIVES GLOW PLUGS YOU A CHOICE The KB-IL and KB-IS Glow Plugs fea­ OF 7 FUELS ture a special platinum alloy wire — superior to that used in any other glow K&B MODEL ENGINE FUEL plug — that makes them more capable with X2C OIL of withstanding the fierce heat of to­ K&B 100+ for Free Flight, U-Con- day’s "H o t" fuels. trol and R/C Flying K&B 500 for R/C Flying & R/C Race Cars — where both high and low speeds are required K&B K&B 1000+ for '/zA Engines K&B SUPER SPEED for going "all GLOW PLUGS out" with Idle Bar K&B MODEL ENGINE FUEL with CASTOR OIL The "Idle Bar" Glow Plugs, long or K&B 100 for Free Flight, U-Control short reach, are the result of a con­ and R/C Flying cept first developed by K&B many K&B 1000 for Vi A Engines years ago. They are a "must” where K&B F.A.I. 80/20 for Pylon, Free control from a low idle to a constant Flight and U-Control Speed— no maximum r.p.m. is required at a given Nitro. Qualifies for F.A.I. rules speed. K&B Fuel is consistent from can to K&B Glow Plugs continuous demand can and year after year . the speaks lor itsell. quality is always there. K&B MANUFACTURING 12152 WOODRUFF AVE., DOWNEY, CA. 90241 v MODEL AUGUST 1979 'BUILDER volume 9, number 91 621 West Nineteenth St., Costa Mesa. California 92627 Phone: (714) 645-8830 CONTENTS STAFF PUBLISHER FEATURES Walter L. Schroder W O RKBENCH , Bill Northrop.................................. 6 EDITOR Wm. C. Northrop, Jr. “ . .T H R E E IF B Y A I R ” , Letters to the Editor............ 7 O V E R T H E C O U N T E R , Phil Bernhardt ................... 8 GENERAL MANAGER R/C W O RLD , Bill Northrop..................................... 10 Walter L. Schroder T H E F L IG H T I N S T R U C T O R , Dave Brow n.............. 12 ASSISTANT EDITOR R / C P Y L O N , Jim Gager........................................... 13 Phil Bernhardt F U E L L IN E S , George Aldrich, Otto Bernhardt, Joe Klause . 14 ASSISTANT GENERAL MANAGER CHOPPER CHATTER, John Tucker........................ 16 Anita Northrop E L E C T R IC P O W E R , Mitch Poling ........·................... 18 ART DEPARTMENT R IV E R O F A I R (Part II), Dave Thornburg................ 25 Chuck Blackburn Al Patterson R / C S O A R I N G , Dr. Larry Fogel............................... 26 H A L F - A S C E N E , Larry Renger ................................. 28 OFFICE STAFF C O X S P O R T A V I A & P IL O T T IN Y A C E , jef Raskin 30 Edie Downs Georgi Gilleran M A M M O T H S C A L E , Ron Shettler ......................... 36 Pat Patton “1 TO 1” R/C SCALE, Bob Underwood.................. 37 A. Valcarsel PLUG SPARKS, John Pond...................................... 38 R/C POW ER BOATING, Jerry Dunlap................... 44 CONTRIBUTING EDITORS STRICTLY SAIL, Rod Carr...................................... 46 George Aldrich Mitch Poling F R E E F L IG H T S C A L E , Fernando Ramos ................... 50 Dave Brown John Pond Otto Bernhardt Fernando Ramos C O N T R O L L IN E , Dan Rutherford ........................... 56 Rod Carr l_arry Renger H AN N AN ’S HANGAR, Bill Hannan....................... 58 Jerry Dunlap Dan Rutherford A .I.R .-X X , Count Alex Pisana..................................... 6 2 Larry Fogel Ron Shettler J im Gager F R E E F L IG H T , Tom Hutchinson................................. 64 Tom Hutchinson Chuck Hallum Dave Thornburg Bill Hannan John Tucker Joe Klause Bob Underwood Walt Mooney SCALE VIEWS CURTISS “GOSHAW K” BFC-2, Pete West burg 32 ADVERTISING MANAGER Walter L. Schroder CONSTRUCTION R/C MODEL BUILDER (ISSN 0145-8175) “SNEAKY PETE”, Dick Hanson ............................................................20 is published monthly by RCMB INC., 621 CURTISS “GOSHAW K” O.T., Miniature Aircraft Corp........................ 35 West Nineteenth St., Costa Mesa, California, 92627. Phone (714) 645-8830. CHALLENGER O.T., H.A. Thomas ...................................................... 43 HANGAR RAT, Harry Barr ................................................................. 53 Subscriptions $20.00 per year, $37.00 for two years. Single copies $2.00. Add $3.50 PEANUT M ONOCOUPE 110 SPECIAL, Butch Hadland ................... 59 per year for postage outside of U.S. (ex­ cept APO and FPO). Copyright 1979 by RCMB INC. All rights reserved. Reproduction without permission prohibited. Change of address notices must be received COVER: Greetings from Hawaii! Barbara Cabebe poses with Darrell Wong's six weeks before date of issue that new Aeromaster, at the entrance of the Oceana Restaurant, which was built on a large address takes effect. Send old address with floating barge, in Honolulu. Powered by an O.S. Max 60 Goldheadand controlled by a new; old label preferred. Post Office w ill not Kraft 7-channel radio, the Monokoted Aeromaster has been modified as follows: forward copies unless you pay extra postage. aluminum cowl, straight wings (52 and 50 inch span), two cockpits, and rounded tail Duplicate issues cannot be sent. surfaces. Transparency was taken by Jim Miura, Kapiolani R/C. Aloha! Second Class postage paid at Costa Mesa, California, and additional offices. 2 R/C MODEL BUILDER Kraft’s more control, more fu more value! The addition of a three channel system to our highly popular Sport Series line gives you the extra ci pa bi lity to make your modeling even more fun ... and this three channel system costs only $149.95 (Sugg, i Ce). It’s perfect for boats, gliders, and simple aircraft. The K P-3 AS, as are our two-channel sets, is top quality. Unlike our competition, we use five-pole servo motors instead of three for greater accuracy and reliability. The system features plug-in receiver and transmitter crystals on the 27 MHz band, and for the receiver only, on the 72 MHz frequency band. I The receiver antenna plugs in, and two special short length Ji( antennas are available for use in cars, boats, and small 1/ airplanes. The system is designed to use pencell type alkaline batteries, but can be easily converted without I modification to rechargeable nickel cadmium batteries with I our conversion kits. This kit contains rechargeable I transmitter and receiver battery packs, charger, and a I switch harness with a built-in charge receptacle. j (Sugg, retail price, $49.95). The KP-3AS system Includes: transmitter, receiver, two servos, battery cases, and switch harness. I The KP-3AS is a quality high reliability radio control system backed by Kraft’s famous reputation for service. The purchaser is protected by a full one-year limited warranty. HOW TO DO LIGHT WORK AT A DISTANCE & The actuator cables used by the radio control model airplane people — they call them "push rods" — are usually installed out of sight, where critics cannot see them. When we looked for throttle, reverse, and steering cables to run in plain view in DIANA's cockpit, everything we found was grossly oversize, far too stiff, and rainbow-colored. We wanted something that looked like honest machinery, scaled to the boat, so we had to design our own. The sheath of our actuator cable is a special Teflon*, .048" o.d., and the wire core is flexible stainless steel, .019" o.d. The severest operating mode for an actuator cable is that in which the sheath must carry the reciprocal load of the core, as in a camera cable release. In this Mode One, our assembly is rated at 12 oz. continuous duty, push and pull. In Mode Two, where the plunger cylinders are fast to the same entity airplane or boat structure the sheath serves chiefly as a guide, and acceptable duty loads increase. Since the sheath material is serviceable to 200°C. (392°F.), and the core wire is non-corroding, the steam/marine environment is unthreatening.