Model Builder March 1982

m m MARCH 1982 volume 12, number 122 THE DYNAMIC DUO There's no better winning combination than a Halt Baron 50 helicopter and JR Unlimited helicopter radio. This Dynamic Duo of engineering excellence was flown to victory by Mike J. Mas in his recent win in the expert division at the 1981 Nationals. Becoming a champion is a selective process. Each step a decision. Thats why Mike chose a Halt Baron 50, sim ilar to the one shown and a JR radio. The kit is quick and easy to assemble, there are no wooden parts to cut out and fit. The main rotor blades are completely finished and balanced. The collective pitch rotor head is factory assembled and fully ball bearing supported. The aluminum engine mount is machined, drilled and tapped to fit most of the popular .60 size engines. Vacuformed body and canopy are shock mounted on rubber grommets for longer life. Each kit comes complete with all the necessary hardware and accessories including: fuel tank, universal servo tray, and linkages to complete the assembly of this outstanding helicopter. All you need is an engine and radio system to be ready to fly. Best of all, we ll keep you flying longer because we have a complete selection of factory parts in stock. So, when you're ready to put the Dynamic Duo to work for you, we'll give you a choice of 10 Halt helicopters and a wide variety of multi channel JR radios. For more inform ation call or write Circus Hobbies, National Champion Mike J. Mas Halt, JR, Webra, and IM are imported exclusively by Circus Hobbies. Send $1.00 for complete product catalog. New address: H0ŽÍM M S5 Circus Hobbies Incorporated, 3132 S. Highland Dr., S^cut ces** Subsidiary of Circus Circus Hotels Las Vegas, Nevada 89109 · (702)731-6472 Flex 4 chassis, a totally new design featuring s h o c k - dampened front and tear roll rates and a trailing lin k controlled beam axle. That gives the RC12i a siusp en - sion without springs, to isolate the radio and batte nes While the tires of the amazing RC12I follow the contours of the track, from excessive vibration for maximum traction every the central chassis, radio equipment and batteries remain stable for track surface. --------- 1------- Supetlighf graph The RC12i WonderCar. Vanloc* drf axle Accepts all popular radio systems. Nobody knows more about building w nners New SK dual compound hre$ e Team. In just four years our RCT2E wo astounding 10 National Championships, winn ng in every class of competition indoors and out. Now there's a tew w in n e rfromA sso cl- ated, the RC12Í. We call the RCT2Í the WoinderCa Dar, be- \ Special Sanyo racing bodenes Κ β Ι \ cause it has handling and road hugging chanacteristics n r a r Flex c iw rg io s s chassis ptaie second to none J _______ 1____ LAT OUT CORNERS THE COMPETITION And the RC12i isn't all that's new from the Team. Special "SK" dual compound front tires, graphite VariLock diff axles, Reedy Indoor rewinds, plus McRae Can-Am, Brabham FI and Lola T600 bodies are just a few of our latest speed secrets. Keep up with all the action with your free sub scription to Racing with the Team. Call or write The IMSA Champion Lola T600 GTR our newest 1:12 scale body shell. New McRae and Conquest Con-Am bodies also available. Associated Electrics 1928 East Edlngef/Santa Ana, CA 92705/(714) 547-4986 1981 ROAR Nationals! Boston-M ike lavacot/Team Associated wins Indoor Modified. Reedy motors win All m odified classes for 4th year in a row. MODEL /= MARCH 1982 BUILDER volume 12, number 122 621 West Nineteenth St., Box 335, Costa Mesa. CA 92627-0132 Phone: (714) 645-8830 STAFF EDITOR/PUBLISHER CONTENTS Wm. C. Northrop, Jr. GENERAL MANAGER FEATURES Anita Northrop WORKBENCH, Bill N orthrop................................................................... 6 ASSISTANT EDITOR OVER THE COUNTER, John Elliot......................................................... 7 John Elliot R/C WORLD, John E llio t......................................................................... 10 ASSISTANT GENERAL MANAGER CHOPPER CHATTER, Ray Hostetler........................................................20 Dawn Holcomb SHORT SHAFT, E lo yM a re z.....................................................................22 ART DEPARTMENT "1 TO 1” R/C SCALE, Bob Underwood...................................................24 Al Patterson HOW TO FLY PATTERN, Dick Hanson................................................... 25 FUEL LINES, Joe K lause............................................................................ 26 OFFICE STAFF R/C SOARING, Dr. Larry Fogel................................................................ 28 Edie Downs ELECTRONICS CORNER, E lo yM are z................................................... 32 Deb bee HoJobaugh SPORT SCENE, Larry Renger ................................................................... 33 A. Valcarsel THORNBURG AT LARGE, Dave Thornburg ...........................................34 CONTRIBUTING EDITORS PLUG SPARKS, John Pond ...................................................................... 35 Dave Brown Joe Klause R/C POWER BOATS, Jerry Dunlap......................................................... 40 Jerry Dunlap Eloy Marez R/C AUTO NEWS, Dan R u th e rfo rd ......................................................... 42 Larry Fogel Walt Mooney ELECTRIC POWER, Mitch Poling ............................................................48 Jim Gager Mitch Poling Bill Hannan John Pond HANNAN’S HANGAR, Bill Hannan........................................................50 Dick Hanson Fernando Ramos CONTROL LINE, Dan R u th e rfo rd ............................................................ 54 Ray Hostetler Larry Renger FREE FLIGHT, Tom Hutchinson ................................................................ 62 Tom Hutchinson Dan Rutherford Ken Johnson Dave Thornburg Bob Underwood ADVERTISING SCALE VIEWS John Elliot DOUGLAS X02D-1 , Nick Karstens............................................................................31 Wm. C. Northrop, Jr. MODEL BUILDER (ISSN 0194 7079) is published monthly by RCMB INC., 621 West Nineteenth Street, Costa Mesa, Cali fornia 92627. Phone (714) 645-6830. CONSTRUCTION GREAT LAKES TRAINER, FrankComyns................................................................. 13 Subscriptions: $25.00 per year, $47.00 for two years. Single copies $2.50. Add $3.50 per TWIN PUSHER O.T., Ralph Kummerand David H e cht...........................................39 year for postage outside the U.S. (except SIMPLE SIMON, Frank Roales........................................................................................ 44 APO and FPO). U.S. funds only, please. PEANUT HOT CANARY, DickSweitzer................................................................... 51 Copyright 1982 by RCMB INC. All rights 1912 BLACKBURN MONOPLANE, Sid M ille r ..................................................56 reserved. Reproduction without permis sion prohibited. Change of address notices must be received six weeks before date of issue that new Cover: A modeler's model, the Great Lakes has appeared in a multitude of scale sizes, address takes effect. Send old address with probably beginning with the famous Cleveland Model & Supply line of many years ago. new; old label preferred. Post Office will In fact, it was kit No. SF-1 in the long, long list of Cleveland 3%4-inc scale models. The not forward copies unless you pay extra aircraft on the cover, in one-fourth scale, was designed, built, and has been flown success postage. Duplicate issues cannot be sent. fully many times, by Frank Comyns, one of Southern California's leading R/C scale mod elers. Frank isn't that competition minded, but his models look and fly well enough to Second class postage paid at Costa Mesa, place high in Precision Scale. Construction article begins on page 13. California, and additional offices. 2 MODEL BUILDER Changing track conditions can servo reverse switch Convenient needle valve send RC cars scurrying into the ing. electronic trim, adjustment knob. pits for a linkage adjustment that mixing and throttle Exclusive torque compensation __ _ could take laps to complete. fine tune in the hand mixing control. The driver with Futaba's 3FG some brushed alloy doesn’t panic though, because he case. Prefer Twin-stick control? has Total Control on his side. The 3-channel 3FG We’ve built the .'EG model for sou. Available A flick of a lever and the system is available with w ith S26 o r S27 servos. adjustable dual rate takes over. a w ide range of servo options, too. Ultra mini for 1:12 scale electrics, while Increase or decrease steering S20 servos are perfect boat and gas car racers favor the seno throw while maintaining full lock-to-lock control. The Gentlemen, choose your servos. watertight, heavy-duty S27’s. 3FG gives \ou a choice, on the track. _ And for total performance, The deluxe 3FG/3- the 3FG can be ordered channel svstem includes An oversteering, R3F triple-tuned receiver, with high-torque, coreless 2-S24 servos. NiCads and * >Futabi sliding car charger. 27 and 72MHz. motor S24's and recharge instantly able NiCad batteries. responds to the pre-set steering ratio and is dialed-in again. The 3FG system was developed by and for serious racers. In addition to rate control, you'll also find Track tune your racer from the driver's stand with the new Futaba 3FG. T3FG ER WE PUT THE THRILL BACK INTO R/C* . been flying your Revolution I for five years. I know For a beginner in R/C Flying I feel you have come up the quality of your products and have been delighted to with a real big winner - both

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