MODEL BUILDER MAY 1975 FULL SIZE PLANS AVAILABLE - SEE PAGE 88 35 Profile of the Gremlin Again Has That "Air" of Being a Big Stunt Ship
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MAY 1975 volume 5, number 41 REALISM YOU CAN RUN W ITH SCALE R/C NEW - TUNA CLIPPER TC-37 Scale Model of the 220’ Purse Seiner, built by Campbell Industries. San Diego. 37” long. 6-1/2” beam. Plywood POWERBOATS construction with mahogany planking. Complete with deck hardware. A beautiful shelf model, yet rugged for R/C use with single or dual Dumas-Pittman motors. Lots of room for FROM DUMAS radio and specialty gear. NEW - THE LITTLE SHELLY FOSS TU-24 A 24” scale kit of this popular tug. Lots of room for R/C gear and electric motor power. Plywood construction. Deck hard ware included. Also available in a 36" model. and as a 45" fiberglass hull model with die cut wood deck and super structure . for electric or steam power. TROJAN CRUISER TR-31 Kit of 3 Γ Trojan cabin cruiser. Γ '= Γ scale. Rugged ply wood construction for gas or electric power. All deck hardware included. Excellent for R/C. Take your choice, these precisely scaled kits are built for R/C boating, free running or shelf display. Each an exacting replica of a popular ocean going prototype. Pretty enough to put on display, sturdy enough to run, they’re just a few examples illustrating why Dumas’ scale and semi-scale model kits lead in helping you get the most out of your hobby. Now available: Pre-packaged hard ware kits with everything you need for running. A hardware kit for every model. dum as Props available. See Your Local Dealer. If He Can't Help You Write Us. COAST GUARD LIFEBOAT S-200 See your hobby dealer or send to o ls 50C lor our complete catalog 33" kit for exacting modeler. Includes deck hardware. Balsa Dumas Products. Inc. construction . display it, run free, or R/C with Dumas- 790 South Park Avenue Pittman electric power. One of the most popular scale models Tucson, Arizona 85719 ever kitted. New Sport Series Five Channel System The KP-3/5 is a companion radio to the famous KP-5 Sport, combining top quality and high performance with many new features. It offers the security of flying Kraft at modest cost. • Compact, lightweight transmitter has excellent balance for better control. Expanded battery voltage meter eliminates guessing battery life. "Click-stop" trim positioning minimizes accidental changes. • New stick design is a composite of the open and closed gimbal types, combining the best features of both. • Control potentiometers are conductive plastic and have vir tually unlimited life with excellent resolution and accuracy. • Complete receiver-servo package mounts quickly and easily; has throttle reversing link. • Aileron or rudder selector permits either channel to be oper ated off of the righthand control stick without transmitter modification. $279.95 \ \ * External block plug is provided for the addition of fourth and fifth servos (not included). • Wired charge receptacle is built into the bottom of the trans mitter to provide instant conversion from the dry battery to our new KB-8D rechargeable transmitter pack. • WRITE FOR FREE CATALOG Heavy-duty KB-4E battery pack is standard. Charge recep tacle is wired into the switch harness. Available now on 72 MHz and 27 MHz. * 450 WEST CALIFORNIA AVENUE RAFT RO. BOX 1268-VISTA, CALIFORNIA 92083 K?SYSTEMS. INC. é World’s Largest Manufacturer of Proportional R/C Equipment ΈΜΟ TO /ILL R/C ENTHUS/ASTS EM'S WHY ÖUR '75 LINE IS MTHI BEST EVER! f,IA L L E N G E R SERIES NOW SPORTS ij/ HIGH-RESOLUTION SEMI OPEN \A L FOR SMOOTHER CONTROL — YOU NOW HAVE A SLOW POLL BUTTON AND DUAL RATE SENSITIVITY SWITCH AT NO EXTRA COST IN THE COMPETITION SERIES / B A CHOICE BETWEEN 1 5 DIFFERENT TYPES ' OF S E R V O S — PL U S <4 BATTERS OPTIONS— A NEW SERVO IS ON THE W A Y — MORE ON THIS LATER ! 1 MASHEEL TRIM LS ARE STANDARD / Μ· DUAL STICK / ITION SERIES — ROR EASIER AND Λ A N ALL-NEW STA N D A R D URATE TRIMMING! Ψ BATTERY CHARGER WITH S INDICATING LIGHTS-Υ Ο υ KNOW WHICH BATTERY IS CHARGING. WE USE LEDS (LIGHT EMITTING DIODES') FOR A IR B O R N E RECEIVER DECODERS ARE LONG LIFE DEPENDABILITY.1 CIRCUITRY — DOES AWAY WITH 16 ER CONVECTIONS— EXTENDS BATTERS' ÍAi/ΙΤΗ A LOW-LOW 7m a DRAIN ------ E IN-FLIGHT RELIABILITY ! CHANNELS -* 5 ^VERSIONS TO CHOOSE FROM ----- THE 7 O S T COMPLETE SELECTION OF CHANNELS/ COMPETITION ONE TWO TWO m DES A N D PRICES EVER. CHECK THIS -------- (OPEN 2 - A X IS 2 -A X IS 2 A X IS E'RE SURE YOU WILL AGREE PRO LINE IS G/MBAL) STICK STICKS STICKS Έ OA/Í.V WAY TO GO IN ' 7 5 ! COMPETITION ONE ONE SINGLE 3 A X IS 3 A X IS STICK STICK STICK " CHALLENGER ONE TWO (S E M I OPEN 2 -A X IS 2 A X IS N. 21St AVE · SUITE 10 PHOENIX. AZ 85029 G/MBAL) STICK STICKS 'HONE (602) 944-4626 -T h e N ?1 1973 AND 1974 SUGGESTED PRICE $460.00 THE QUALITY HELICOPTER PERFORMING LOOPS AVAILABLE AT BETTER DEALERS EVERYWHERE OR ORDER DIRECT DEALERS SEE YOUR KAVAN DISTRIBUTORS DON’T LOSE YOUR TAIL! THE KAVAN GYROSCOPE PREVENTS UNWANTED TURNS BY AUTOMATICALLY ADJUSTING TAIL ROTOR LATEST HEAD MODIFICATION TO JET RANGER INCREASES STABILITY BY CONTROLING THE GYROSCOPIC FUNCTION OF THE FLIGHTWEIGHTS FREE OF CHARGE FOR YOUR FIRST JET RANGER WRITE FOR DETAILS MODEL AIRCRAFT INC., 1424 E. BORCHARD AVE., SANTA ANA, CALIF. 92705 TELEPHONE 714-8 35-77 88 MODEL AND CRAFT SHOW TWO BIG “ s t e t i o n DAYS MAY 3rd & 4th OVER 200 EXHIBITORS Indoor and Outdoor Demonstrations Radio Controlled Planes, Cars, Boats, Helicopters Gliders, Rockets and Plastics —CONTEST OPEN TO THE PUBLIC—) Over 57 Categories with trophies, awards and prizes in each category. NO E N T R Y FEE. Check local hobby or craft shop for details. HOURS: SAT 10 A M - 8 PM SUN 11 AM - 6 PM Admission: 2.50 Adults 1.50 Jr. (under 18) Under 6 Free SAVE 50 ' WITH FREE DISCOUNT TICKETS AVAILABLE AT ANY LOCAL HOBBY SHOP CONVENTION CENTER 800 W«gl Kotello Ave., Anoheitn, Colifornia NEXT TO DISNEYLAND FLYING SITE: HILL COUNTRY TIME: AIR MUSEUM, MAY 17 & MORGAN HILL, 1975 CALIFORNIA 1STAnnual West Coast * * s · ^ Work) War IISCROMHE ^ . SPONSORED BY THE PIONEER R.C. CLUB of Sunnyvale, California ^ and MODEL BUILDER MAGAZINE 'J ^ A M A and SPORT SCALE . AMA ENGINE ^ ( NO BOM ) AT and WEIGHT RULES ☆ .......................... ..... C.D. - LOUIS DELAT EUR ...................................... INFO-PACKET and PRE-REGISTRATION FORM UPON REQUEST!!! Contest Manager- Eric Clapp, 6116 Castello Drive, San Jose, CA 95120 Phone No. (408) 997-2298 2 WHEN CONTACTING ADVERTISERS,TELL ’EM MODEL BUILDER SENT/H0OBL BUILDER MODEL S MAY 1975 BUILDER volume 5, number 41 1105 SPURGEON, BOX 4336, SANTA ANA, CALIFORNIA 92702 (714) 547-3963 STAFF CONTENTS EDITOR FEATURES Wm. C. Northrop, )r. WORKBENCH, Bill N o r th r o p ............................................................................................. 4 GENERAL MANAGER Anita Northrop OVER THE COUNTER, Bill N o r th r o p .......................................................................... 5 EDITORIAL ASSISTANT REMOTELY SPEAKING, Bill N o r th r o p ........................................................................ 14 Le Gray R 1C SOARING, Le G r a y ..................................................................................................... 22 ASST. GEN. MANAGER Dawn Garrott CHOPPER CHATTER, John T u c k e r ............................................................................. 24 ART DIRECTOR PRODUCT? IN U$E, Ken W o lf ...........................................................................................30 Paul Plecan PRODUCT? IN U?E, Charles Larkey ............................................................................... 32 SECRETARY STRICTLY SAIL, Rod C a r r ................................................................................................ 37 L. Gordon SUBSCRIPTION MANAGER F/F SCALE, Fernando R a m o s ............................................................................................. 40 A. Valcarsel HANNAN'S HANGAR, Bill H a n n a n ............................................................................. 42 FREE FLIGHT, Bob S ta lic k .............................................................................................. 46 CONTRIBUTORS R 1C AUTO NEWS, Chuck H a llu m .................................................................................. 50 Rod Carr Chuck Hallum PLUG SPARKS, John P o n d ...................................................................................................52 Bill Hannan CONTROL LINE, Jed K u s ik ............................................................................................. 56 Jed Kusik Walt Mooney John Pond SCALE VIEWS Fernando Ramos CASSUTT MODEL 2, H arold O s b o rn e .......................................................................... 29 Bob Stalick John Tucker CONSTRUCTION ADVERTISING REPRESENTATIVES 1930 FLEET, R/C SPORT SCALE, Romey Bukolt 8 WEST: Bob Upton, 20626 Clarendon Ave. SEA FURY, HALF-A PYLON RACER, Jerry Holcomb ...................................... 21 Woodland Hills, California 91364 (213) 884-2294 GREMLIN, HALF-A C/L STUNT, Tom D ix o n ..........................................................34 EAST: Walt Moucha, 605 3rd Ave., E. Northport, New York 11731 BLÉRIOT IV PEANUT SCALE, W alt M o o n e y .......................................................... 43 (516) 266-3596 SCIENTIFIC MERCURY OLD TIMER, Phil B e r n h a r d t.................................... 54 Subscriptions $12.50 per year, $23.00 for two years. Single copies $1.25. Add $2.00 for postage per year outside of U.S. (Except APO). Add 75 cents for Canada and Mexico. Copyright 1975 The MODEL BUILDER. Cover: Cliff Silva, Livermore, California, is an ardent Old Timer modeler. His interest, All rights