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. Unloaded friction is 0.1 oz. (3 grams) per foot, and an easy turn radius is half an inch. \ There is one hitch: You must machine the parts, heat-swage the sheath to form \ its locking shoulder, and assemble the unit. The cost of automatic screw machine setup \ and the marvelous intractability of Teflon combine to move these operations into your shop. As is our practice, we provide the hard-to-find materials only. Included in \ the kit are 8 feet each of core wire and sheath, 8 inches of 1/16" o.d. plunger rod (polished stainless steel with a .023" diameter axial hole down it), a special Ungar soldering iron tiplet for heat-swaging the sheath, a capsule of silicone release agent to prevent the softened Teflon from sticking.to the tiplet, and complete drawings and instructions. Each kit will make either two or three complete cables, depending on their length and the stroke desired. Order from the stock list offered below.

•Teflon »s a registered TM of DuPont Corp

(For the curious, the retaining ring on the 1/8" o.d. / trunnion journal came from / Caltronic Laboratories.) /

Acrznt. ^/z£ a*A »w « 4 p//ora

fib Our purpose here at The Steamfitter is to provide, at conscionable prices, materials and things that we know to be valuable and needed, but that ordinarily are available only in big cities, in bulk, and just to industrial users. We have boilermaking copper tube in sizes from 1/8 inch o.d. through 6-1/8" o.d., hard copper sheet, fiberglass lagging for steam lines, metal dyes, Loctite kits, the beautiful DIANA open steam launch and her propellers. Conger train crew lanterns, small brass wire, and much else. Send a dollar for our stock list; the dollar will be credited against the amount of your first order.

(he Steam filtei Specialties To The Live Steam Trade R.D. 3, Box 326ΛΛ Chestertown, Maryland 21620

4 R/C MODEL BUILDER ^siGir SIG BALSA ^sig^t THE LARGEST SELECTION OF AAA AIRCRAFT BALSA AVAILABLE ANYWHERE

STICKS - 36“ Length« STICKS - 46“ Length« BLOCKS · 3" Length· BLOCKS · 18“ Length· PLANKS - 36“ Length· B-251 ...... 12 B-333 1 X 1 __ __ 59 B-OOl 1/16 X 1/16 08 ΒΌ61 1/8 X 1/8 ...... 15 B-173 1/32 X 2 ...... 22 1 X 1 B 206 1 X 1 ...... 1.27 ------.22 B-334 1 X 2 1-23 B-002 1/16 X 1/8 09 B-062 1/8 s 1/4 21 B-174 1/16 X 2 ...... 25 B-252 1 X 2 B-207 1/2 X 2 1 69 B-253 2 x 2 ...... 30 B 335 2 X 2 ____1.51 B-003 1/16 X 3/16 .12 B-063 1/8 X 1/2 ...... 35 B-175 3/32 X 2 ...... 28 B 208 3/4 i 2 2.15 B-336 1 X 3 ...... 1.51 B-004 1/16 X 1/4 .15 B-064 3 /1 6 X 3/16 23 B-176 1/8 X 2 ...... 31 B-254 1 X 3 ...... 30 B-209 1 X 2 2 50 B-005 1/16 X 3/8 ..... 18 B-065 3 /1 6 X 1/2 ...... 40 B-177 3 /1 6 X 2 ...... 40 B-255 2 x 3 ...... 40 B-337 2 X 3 ------2.31 B 210 1-1/2 X 2 2 95 3 47 B-006 1/16 X 1/2 ... .21 B-066 3/16 X 3/4 52 B 178 1/4 X 2 ...... 51 B 338 3 X 3 B 211 2 2 3 35 B-339 X 4 ...... 1.97 B-007 1/16 X 3/4 .28 B-067 1/4 X 1/4 33 B-179 3 /8 X 2 ...... 55 BLOCKS · 6“ Length· 1 8-212 1/2x3 2 15 B 340 2 X 4 ------3.13 B 008 1/16 X 1 34 B-068 1/4 X 1/2 .... 44 B-180 1/32 X 3 ...... 30 B-266 1 X 1 ...... 23 B-213 3/4x3 269 B-341 3 X 4 4 62 B-009 3/32 X 3/32 .10 B-069 1/4 X 3/4 58 B-181 1/20 X 3 ------.32 8-267 1/2x2 ...... 29 B-214 1 X 3 ...... 3 3 5 B-342 1 X 6 3 10 BOIO 3/32 X 1/8 ... .11 B-070 5/16 X 5/16 40 B-182 1/16 X 3 ...... 33 8 268 3/4 X 2 ...... 36 B-215 1-1/2 X 3 4.15 B-343 2 X 6 4 50 B-Oll 3/32 X 3/16 .12 B-071 3/8 X 3 /8 ...... 55 B-183 3/32 X 3 ------40 B-269 1 X 2 ...... 41 B-216 2 x 3 ...... 4 9 0 1/4 ...... 14 B 344 3 X 6 ...... 6.77 ΒΌ12 3/32 X B-072 3/8 X 1/2 62 B-184 1/8 X 3 ...... 46 B-270 1-1/2 X 2 ... 48 B-217 3 X 3 ...... 7.45 ΒΌ13 3/32 X 3/8 ...... 19 B-073 3/8 X 3/4 78 B-185 5/32 X 3 ...... 52 B-271 2 X 2 ...... 55 BLOCKS - 24“ Length· B 218 1/2x4 340 B-014 3/32 X 1/2 23 B-074 1/2 X 1/2 .... 72 B-186 3 /1 6 X 3 ____ 58 B-272 1 / 2 x 3 ..... 38 B-354 1 X 1 ----- 81 B-219 3/4x4 3 80 30 X B-015 3/32 X 3/4 B-075 1/2 X 3/4 98 B-187 1/4 X 3 ___ 64 B-273 3/4 X 3 47 B-355 1 2 ----- 1.62 B-220 1 X 4 4 20 B-016 3/32 X 1 ... 39 B 188 74 B-356 2 X 2 2 13 5 /1 6 X 3 ...... B-274 1 X 3 ...... 56 B-221 1-1/2 X 4 ...... 5.35 B-017 1/8 X 1/8 48“ AAA SHEETS B-357 1/2 1.30 B-189 3 / 8 x 3 ...... 83 B-275 1-1/2 X 3 65 B-222 2 ...... 6.50 B-018 1/8 X 3/16 .14 8-388 1/32 X 3 ... 86 B-358 1 3 ...... 2.13 B-190 1/32 X 4 49 B-276 2 X 3 .... -.. .75 B 223 3 x 4 ...... 10.25 B-019 1/8 X 1/4 ...... 17 B-389 1/16 X 3 ... 92 B-359 2 3 -.... 3 06 B-191 1/16 X 4 ---- 53 B-277 3x3-.. 1.16 B-224 1/2x6 4.75 B-020 1/8 X 5/16 .19 B-390 3/32 X 3 1.10 B-360 3 3 ...... 4 62 B-192 3/32 X 4 ---- 61 B-278 1/2x4 .... 55 B-225 3/4x6 ...... 5.90 B-021 1/8 X 3/8 -22 B-391 1/8 X 3 — 1.28 B-361 1 4 ...... 2 66 B-193 1/8 X 4 ...... 71 B-279 3/4 X 4 63 B-226 1 x6 ...... 6.70 1/8 X 1/2 ...... 26 B-392 3/16 X 8-362 2 4 ...... 4 16 ΒΌ22 3 1.63 B 194 3/16 X 4 79 B 280 1 X 4 ...... 70 B-227 1-1/2 X 6 ... 8 85 B-023 1/8 X 3/4 38 B-393 1/4 X 3 ... 1 80 B-363 3 4 ...... 6.10 B-195 1/4 X 4 ----- 93 B-281 1-1/2 X 4 88 B-228 2 x 6 ...... 10.25 B-024 1/8 X 1 ...... 43 B-394 3/8 X .2.34 B 364 1 6 ----- 4 10 3 8 196 3 / 8 x 4 . 1 18 B-282 2 x 4 ... 1.07 B-229 3 x 6 ...... 14.50 ΒΌ25 3 /1 6 X 3 /1 6 .... .17 B-395 1/16 X 4 - 1 3 2 B-365 2 6 ...... 6.10 B 283 3 x 4 ...... 1.54 B-026 3 /1 6 X 1/4 ..... 2 1 B-396 3/32 X 4 .1.64 B 366 3 6 ------9.00 C-GRAIN AAA 8 * 12 LBS B-284 1/2x6 __.79 B-027 .25 B-397 1/8 X 4 ...1.86 3/16 X 3/8 ...... 92 8-470 1/32 X 2 53 B-134 1/32 « 2 - ...... 46 B 285 3/4 X 6 AIRFOILED B-028 3 /1 6 X 1 / 2 ----- 30 B-398 3/16 X 4 2.20 B-471 1/16 X 2 56 B-135 1/16 X 2 ...... 48 B-286 l X 6 .... 1.07 B-029 3/16 X 3/4 ...... 39 B-399 1/4 X 4 ....2 60 SHAPED SHEETS B-287 1.33 B-472 3/32 X 2 ...... 64 B-400 B 136 3/32 X 2 - ...... 59 1-1/2 X 6 B-lll 3/16 X 3 X 36 1 3 5 B-030 3 /1 6 X 1 ------48 3/8 X 4 ....3 2 5 B-473 1/8 x 2 _ .74 B-137 1/8 X 2 .... 69 B 288 2x6 ...... 1.50 B-112 1/4 X 3 X 36 .. 1.50 B 031 1/4 X 1 / 4 ...... 25 B-401 1/16 X 6 ...2 5 5 B-474 3 /1 6 X 2 ... -93 B-138 3/16 X 2 ... 88 B-289 3 x 6 ,..-2 32 B-113 1/4 X 4 X 36 ...2.15 B-032 1/4 X 3/8 ...... 30 B-402 3/32 X 6 .2 8 5 B-475 1/4 X 2 ...1.17 B 139 1/4 X 2 ...... 1.12 B-033 1/4 X 1/2 ...... 35 B-403 1/8 X 6 ...2.95 BLOCKS · 12“ Lengths 36“ TAPERED B-476 3/8 x 2 130 B-404 3/16 X B-140 3/8x2 .. 1.25 B-034 1/4 X 3/4 ...... 49 6 ...3,40 TRAILING EDGE B-477 1/32 X 3 69 B 141 1/32 X 3 ....___ .64 B-299 42 B 035 1/4 X 1 ...... 60 B-405 1/4 X 6 3 8 2 B-097 l/b X 1/2 ...... 31 B-478 1/16 X 3 .74 1/20 X 3 .... .66 1/2 X 2 .....55 B-036 5/16 X 5/16 .... .30 B-406 3/8 X 6 4.95 B-142 Β-09Θ 3 /1 6 X 3 /4 . .. 40 B-479 3/32 X 3 88 B 301 3/4 X 2 ..... 70 B-037 5/16 > 3 /8...... 39 B 143 1/16 X 3 .... 69 B-099 1/4 X 1 ------51 B 480 1 / 8 x 3 . .1.00 TAPERED CUT SHEETS B-302 .....82 B-038 5/16* 1/2...... 46 B-144 3/32 X 3 ....___ B3 B-100 5/16 X 1-1/4 63 B-481 3 /1 6 X 3 .1 27 36" Length« B-303 B-039 5/16« 5/8 ...... 58 B-145 1/ 8 x3 ..... 96 B-101 3/8 X 1-1/2 - 72 B-482 1/4 X 3 ..1.40 Tapered to 1/16“ Edge B 304 1.07 B-040 5/16 X l ...... 65 B 146 5/32 X 3 ___1.12 B-483 3 / 8 x 3 .1 80 B-041 3/8 X 3/8 ...... 45 B-430 1/4 X 3 1.40 B-147 3/16 X 3 ....— 1.22 1 / 2 x 3 ... 68 BAGS OF BALSA B-042 3/8 X 1/2 ...... 51 B-431 1/4 X 4 ___ 2.10 B-148 1/4x3 . 1.35 3/4 X 3 86 B-524 Bags ot Balsa 2 25 VH ■ VERY HARD 1 X 3 ...... 1.07 B-043 3/8 X 3/4 ...... 59 B 149 5/16 X 3 1.59 B-493 1/16 X 3 _.74 ROUNDED EDGE B-044 3/8 X 1 ...... 75 B-150 3/8x3 ...... 1.75 ODDS A ENDS B-494 3/32 X 3 88 AILERON 6 ELEVATOR STOCK B-309 2 x 3 ___ B-045 1/2 X 1/2 ...... 57 B-151 1/32 X 4 ...... 98 1.53 PACKAGE OF BALSA B-495 l /β X 3 .1.00 B-441 1/4 X 1 ..... 70 B-310 B-046 1/2 X 3/4 .77 B-152 1/16 X 4 ---- 1.16 B-534 Package ..1.75 B-496 3 /1 6 X 3 .1.27 B 442 3/8 X ____82 B-311 1/2x4.. . 1.07 B-047 1/2 X 1 ...... 96 1 B 153 3/32 X 4 ...... 1.25 B-497 1/4x3 .1.40 B-443 1/4 X 2 ...1.12 3/4 X 4 .. 1 23 B-048 5/8 X 5/8 70 B-154 1/8x4 ....—... 1.40 B-498 3/8x3 .1 80 B 444 .1.25 1 x 4 B-049 5/8 X 1 ...... 1.05 3/8 X 2 B-155 3/16 X 4 — 1.65 .1 45 B-050 3/4 X 3/4 ...... 97 B 156 1/4 X 4 195 1-1/2 X 4 .1.72 BULK BALSA - 3" x 36” CONTEST BALSA LEADING EDGE B-157 B-315 2 x 4 ----- 2.07 Very Light 4 - 6 Lb. Stock B-051 3/4 X 1 ...... 1.15 36“ Length· 3/8 X 4 2 50 Not Stamped or Sorted B-316 3 x 4 3 06 B-085 1/2 X 3 /8 ----- 54 B-158 1/16 X 6 ----1.94 B-508 1/32 X 3 50 B-454 1/32 X 3 ...... 74 TRIANGULAR CUT BALSA 36“ B-317 1/2x6 1.48 B-509 1/16 X 3 .... 54 B-086 3 /4 X 5/8 .... 92 B-159 3/32 X 6 ..... 2 15 B-455 1/16 X 3 ___ 79 B-416 1/4 i 1/4 .31 3/4 X 6 . 1.72 B-087 1 X 3 / 4 ___ B-160 1/8x6 ..... 2.37 B-510 3/32 X 3 — 64 B-456 3 /3 2 X 3 . 93 1.22 1 x 6 2 03 B-417 3 /8 X 3 /8 39 8-161 3/16 X 6 ..... 2.65 B-511 1/8x3 ...... 76 B-457 1/8x3 ..1.06 1-1/2 X 6 2 6 1 B-418 1/2 X 1/2 49 ASSORTMENT B 162 1/4 k 6 B-512 3/16 X 3 92 B 458 3 /1 6 X 3 .1.32 B-321 2 » 6 3 05 B-419 3/4 X 3/4 63 B-600 Model Builder's Balsa B-163 3/8x6 .....3 90 B-513 1/4 X 3 1.12 B-459 1/4x3 .1 45 B-420 1 X 1 ...... 84 Wood Assortm ent ...... 7.50 B-322 3 x 6 4 52 B-514 3/8x3 ..... 1.40 B 460 3/8x3 .—1.85

ill ACC If IT COMPLETE KIT FOR MAKING FINISHING RESIN KIT VLHJJ 111 1 FIBERGLASS PARTS

Six Sheets 9" X 11" Tri-M-lte 8 Oz. Can Resin & Hardener Mixing Sticks Mixing Cups One Pint Resin With Hardener 1 Oz. Can Release Agent 28" X 38" Glass Cloth Directions For Use The Best Hobby Dealers Stock SIG - Catalog 4 0 -Complete Line Of Kits And Accessories -$2.00 SIG MANUFACTURING CO...... Montezuma, IA 50171 f r o m Birthday number 6 coming up for Belinda Northrop, shown here in RCMB's booth at the MAC B i l l show. Anita N. and Susan Schroder give her a hand. Belinda now drives R/C dune buggies. plan, you will also receive a separate One hundred people turned to each N o r t h r o p ' * sheet reproducing in full size all of the other in unison and said, ‘What did she printed sheetwood that comes with the say?’ During the takeoff roll, the center w o r k b e n c h kit. This will give you all of the ribs and engine of the 727 suffered two compres­ bulkheads not shown on the plans. sor stalls, one of which caused a number R/Cers might want to double the 32-1/2 of oxygen mask units to fall down. The MYSTERY SOLVED inch span model drawings for a classic rest of the flight was uneventful, except A leiter from Al Zorie, Satellite Beach. between-wars military aircraft. for considerable turbulence and an Florida answers our question about the “ HOW’S THAT AGAIN?” DEPT. unusually heavy run on the bar service.” designer of the 9 ft. Taylorcraft formerly We got a kick out of the following NOT ONLY GASOLINE. . . kitted by Miniature Aircraft Corp., and from Fred KomLosy as written by him in Although “ How’s your gas supply?” is featured as our Old Timer of the Month the “ Tale Spins” newsletter which he the main topic of conversation these plan in May. Turns out it was M.A.C.’s writes for his fellow Palm Beach (Florida) days, we’re once again reminded of our owner K.H. Pouch, who operated the Aeronauts. We bleeped the airline name January 1977 editorial as we see the company from his home on Staten for obvious reasons. increased prices and decreased alloca­ Island, in New York Harbor. Al still has a “ My trip went well, with the only tions of nitromethane that went into couple of the kits and a copy of the 1941 aviation ‘thrills’ being provided by effect on April 1,1979. In that editorial, catalog...... The first was prior to takeoff, we made what was thought to be a safe This month, on page 35, you'll find a which was delayed two hours. It was at prediction . . . that before the year was print of the plans for the M.A.C. Curtiss that point that the departure lounge out, some enterprising engine manufac­ Goshawk F-11C-4, in conjunction with attendant announced over the P.A. .. . turer would introduce a line of ignition Pete Westburg's drawings of the BFC-2 they were going to ground the aircraft engines for free flight, control line, and version. When in the 8th grade, we built due to mechanical problems, but the radio control models. this model, leaving it uncovered and Captain said it’s okay, so we’ll load now. installing movable controls from the We’re still amazed that it hasn't hap­ cockpit, as detailed on the plans. Al­ pened, and must now speculate again ready a typical modeler who doesn’t on the possibilities. Even though gaso­ follow the plans, our control linkage line is playing hide-and-seek, and the consisted of thread instead of wire, with price is rapidly approaching (passing?) a glass beads for pulleys glued into ribs, dollar per gallon, it has a long way to go spars, etc. to convey movement from the to beat most glow fuels which are in the stick and pedals to the moving surfaces. 10 to 15 dollar per gallon category. Add a Typically, full deflection of the stick or quart of oil to the gallon of gas and pedals, by the time all the slack in the you’re still under 1-1/4 gallons of igni­ thread was taken up, resulted in micro­ tion fuel. scopic movement of the movable Non-R/C interfering ignition engines surface. However, it was all part of that are becoming standard equipment with invaluable education that you acquire many Old Timer fliers. It’s no big deal to from building your own instead of overcome ignition noise interference in buying them. radios, if it does create a problem ... We were fortunate in being able to which it oftentimes doesn't. Proper relive some of this personal history justa insulation or isolation of the ignition few years ago. when we purchased our system usually takes care of it. second Miniature Aircraft Corp. kit for Speaking of glow fuel prices . . . of the Goshawk from a hobby shop in course the main cause of the recent cost increase has been the sudden hike in Orange, California that was going out of Whatinell'sgoing on here!? Walt Schroder business after many, many years. As stares, and Phil Kraft smiles. See other photos nitromethane costs. George Aldrich, pointed out on page 35, if you order the in R/C World for the answer. Continued on page 117

6 R/C MODEL BUILDER Dear Bill: t P In the May. 1979. issue ol Model Builder I noted a number ol things of interest that I Ι ι · ι if by wanted to write to you about. Ti/Kff /If B First oil. in Bill Hannan s Hangar column was Ihe mention ol Richard Allen's idea he calls (Letters to the Editor) "Extended Scale. " Thai sounds a bit like Ihe idea I've been tooling around with lor about live years, which I call "Pseudo Scale " (Pseudo Dear Bill & Crew, the challenge of a stubborn ship that won't Well, lime lo renew your magazine still trim out. We'll see.. . Scale is a model ol an aircraft that didn't exist, bul might have For example, putting two P-63s remains the worst buy on the market. I spend 3. We understand 1/8-inch foamboard is together to come up with a "Twin Cobra" a lat hundreds ol dollars a year on your magazine also being manufactured, but so far, it can the Twin Mustang, etc.) At any rate. I'd like to well, that and the endless protects you lure me only be purchased in freight car lots. It's write to A lien il you. or Hannan, could supply me into. I am just about at the point ol selling all my great material, with or without the paper with his address. ham gear to get more ol that Stull you keep covering . .. much stiffer with it, of course. The other things: Í like Model Builder, am showing me. ''Meanderthal" indeed! glad to see it will be on the newsstands I've 1 tried to quit, honest I did . I got triends to 4. We were sorry to see Jumbo rubber had a dilficult time getting a copy before the help it didn't work .the filmmaker is a scale drop down to a 36-inch span minimum local hobby shop is sold out. Keep the Peanuts closet Staggerwing freak, the sports car racer from the earlier 48-inch span . but 6 feet going (coming?), don't change too much when now does R/C electric cars; I get on my radio, . . . wow! Ed Dolby's going to love this one! and the guy on 40 meters Hies R/C sailplanes you become R/C. etc (although I can see why loo HELP." the change is probably a good idea), and was John Hullgren Dear Editor. interested to see the SAM meets to be held in Eugene. Oregon Just received my copy ol May 1979 MB Rocky Hill. Connecticut I grew up in that town Sorry, John, there is no immunity from Request you either a) reduce your magazine (we moved there in 1939 when nobody had modelmania. Germ carriers show up in the size to 3x5 or b) increase your magazine size to heard ol il except the 5.000 residents) and used least expected places. Best thing to do is lay 30x40. Guys my age should either a) not be to tly m odels in the m eadow s along the back and enjoy. able to see covers like that or b) be able to see Connecticut River even won a third place in covers like that without having to tear the shop the Connecticut State Championships with a up to find a 10X loop (magnifying glass). Option Thermic 50 that must have been in 1948 or Dear Mr, Northrop: b is the clear choice in both instances. Are so .. I remember that Frank Bushey was CD You promised us in your April 1979 issue a those Jim Crocket Replicas Coupe hooks he later became AM A prexy (but you know Peanut Fokker Triplane in the May 1979 issue allixing Ihe girl model's, er oh mm. control line? that) Well, enough Like MB would like Allen's What is this iazz. Ί cant get it tolly, solwon't II so. his product has now clearly completed address. Many thanks publish it?" Maybe Mooney can't do it . so stress testing Rev Hartland H. Gilford what. Maybe someone else can Your name change strongly implies more Secretary lor Stewardship An "Oiler Ό-2; wowi tl you 're going to publish R/C. No doubt there is more money in R/C than Lutheran Church ol America obscure "also rans" ol Ihe Big War. please at in rubber bands, but I think the gum banders hll Philadelphia. Pennsylvania least include a 3-view lor documentation or at a much needed spectrum ol the hobby. A s Phew! Thought we were going to catch least give us the relerence sources and/or irreplaceable as girls h— er, heck for the May cover. See our some background. Was the real ship all white? Charley Roth answer to Charley Roth re the RCMB Come on' And who cares about a Bellanca San Dimas. California change and gum band models. Richard “Aries" anyway? We often wondered what Jim Crocket Allen's address is on its way to you. With best wishes. really did for a living! Jerry Bockius Gum banders are alive and well, and we Colchester. Connecticut hope our R/C advertisers realize that with­ Dear sirs. Best wishes for what, Jerry? Sand in our out planting seeds, you don't get a new crop. .1 have been an active member ol the dollar-per-gallon gasoline? We intend to keep on plantin'. VA R M S (Victorian Association ol Radio Continued on page 104 Bill, A number ol things 1. The "hot water technique" lor forming thin plastic is now down pat. Tom Houle recently used it on the canopy of a Jumbo OU-10 Bronco. He said it worked perfectly. 2 Hmm Why not run Walt Mooney's Tri­ plane Peanut anyway? Make it a "Beat Walt Mooney" challenge Can a mere mortal beat the Great Peanut? Might be lun to try (Maybe not lor Walt.) 3. One ol my present interests is experi­ menting with loamboard lor novice planes (also an R/C glider) A 30 x 40 inch sheet is about $3.00 here Gives one heck ol a lot ol building material per dollar The paper covering on a 3/16 sheet soaks oil easily. So lar I have a 24 inch fuselage, sheet loam sides, 3/16 x 1/4 loam cross pieces. Covered, and with balsa doublers at the motor peg plus balsa strips around the nose, the weight is 19 grams. (Really like the name I gave Ihe R/C glider MEANDER- THAL.) Did I hear a groan? 4. Apparently there is a lillle interest in bigger-than-iumbo rubber scale models. I have been gelling letters and copies ol others letters on this sub/ect Minimum wingspans being discussed are on the order ol 6 leet Dave Gibson Louisville. Ohio 1. First reports on this idea sounded very promising. Hope to publish it for you soon. 2. You any kin to Bockius? We know Walt Mooney well enough to understand his concern about publishing plans for a model of dubious performance. On the other hand, "The first third resembles a catalog. Dirty Dan complains and complains. Worst of all, they no modeler worth his balsa dust can pass up never publish the neat letters I send!"

AUGUST I979 7 OVER THE COUNTER

The new "Live-Wire Champ Mark III" from Midwest Products. Top Flite's "Contender 40," shown here with the optional bent wing.

• In the April 79 issue we mentioned and a full-color decal sheet. that Hal deBolt had joined the Midwest No word on the price, but whatever Products group and would be working Midwest is asking for it, you can bet the in (he design department. Well, the first kit will be worth it. From Midwest result of this program should be avail­ Products Co., 400 S. Indiana St.. Hobart, able in the very near future. It’s a rede­ IN 46342. signed version of the classic Live-Wire * * * Champ, to be called the Live-Wire Top Flite Models is releasing a kit for a Champ Mark III. This is the third time scaled-down, ,40-powered version of this particular design has been updated, the well-known Contender, to be called, and it’s now better than ever. The model oddly enough, the Contender 40. If this is designed for one to three channels of one flies anywhere near as well as its big R/C and .15 to .35 size engines. Wing­ brother, then Top Flite has come out span is 55 inches. The kil comes with a with a winner indeed. The airplane is conventional landing gear, but the plan designed to go together in a minimum shows an optional tricycle landing gear of time and can be built with the engine installation for those who can’t handle a mounted either upright or inverted and taildragger (that little remark ought to with either a straight or bent wing (for bring in all sorts of hate mail!). In more stability, should be a help for the addition to the top-quality wood and absolute beginner). hardware, the kit contains a detailed plan, comprehensive assembly manual, The Contender 40 spans 47 inches, has 500 square inches of wing area, is 43-3/4 inches long, and weighs around 4-1/2 Perry Pumps and Pump Carbs are now pounds ready to go. The model is available for HB ,40's, ,50's, and .6l's.

MRC-Tamiya's R/C Car Guidebook. Pica Enterprises' new Bucker Bu 133 Jungmeister, to be released in the near future.

8 R/C MODEL BUILDER From Williams Brothers, a 1/32-scale plastic display model of the Wedell-Williams Racer, which can be finished to resemble the "Gilmore Red Lion" (left), "Miss Patterson" (right), or "Miss New Orleans" (below). your engine. It sure can’t hurt! The Perry Pump comes complete with an adjusting wrench and detailed in­ structions. All these items are now available at your dealer, or you Can order direct. Bavarian Precision Prod­ ucts Co., P.O. Box 6, New Canaan. CT 06840. $ * * Mr. Astro Flight, Bob Boucher, favored us with a hot-off-the-press copy of his new book, THE QUIET REVOLUTION: The Complete Manual of Electric Pro­ pulsion Systems. That’s just what it is, too: complete. Bob has been working on this project on and off for more than two years, and has done an excellent job of covering and explaining (in simple terms) all aspects of electric power. For example, there are sections about per­ manent magnet motors, ni-cd batteries designed with a thick, high-lift airfoil and metal fittings needed to complete that is claimed to make the airplane the model. The Contender 40 should Continued on page 714 almost impossible to stall. The kit fea­ make a great trainer or sport model, or, tures a machined leading edge, one- like the venerable Ugly Stik, would be piece fuselage sides, something like 20 ideal as a test bed for different engines die-cut balsa and ply sheets, a formed or to try out new radio systems. canopy, and all of tne special little nylon The Contender 40 should be in your local hobby shop by now, or you can order direct from Top Flite Models, Inc., 1901 N. Narragansett Ave., Chicago, IL 60639.

From Bavarian Precision Products "Grabbers," a new line of l/12-scale car racing comes word that Perry Pumpsand Pump tires from Parma International. Carburetors are now available for all HB ,40’s, HB .50’s, and HB ,61’s. Those who have already tried such a pump system on their engines know it’s the only way to go for a steady engine run through all maneuvers. In addition to increasing the already high performance of the HB engines, the Perry Pump and Pump Carb combination will let you put the fuel tank virtually anywhere in your plane or boat. HB Engines also recommends the Davis Diesel Conversions are now available for use of the Perry Air Cleaner as an easy, Parma's speed control resistors for electric R/C engines all the way up to .60’s. inexpensive way to increase the life of cars.

Two new Lexan racing bodies from Parma, the Capri (left) and "K ro ll." Can be bought clear or painted.

AUGUST I979 9 Col. Bob Thacker's "Turner Special", last month's feature, took first This is a roast!? Belly dancer was part of the "treatm ent" awarded in Sport Scale at the MAC Show, Long Beach, CA. Walt Schroder at MAC'S roast in his honor.

By BILL NORTHROP EWORLD PHOTOS BY AUTHOR “ MY FIRST R/C. . Mixer,’ it was an Arden .09 powered nose instead of the coil and batteries! In the June "R/C World” column, we pusher, with the engine aft of the tail like "It flew well, though overweight, and talked about our first R/C airplane and the full scale Douglas Mixmaster. Radio had an Austin flight timer to limit engine put out a request to our readers for was the then new Aero-Trol manufac­ runs to about a minute for test flights.. . pictures and info about their first R/C, tured (before Berkeley) by the old Aero in case the radio didn’t work . .. and it particularly if they were one of those spark coil company in Kingston, New was trimmed to fly free flight. Only adventuresome souls who took up R/C York. rudder control was used. in the days of escapements. Galloping “ The first version had an ignition "Plans were published in Air Trails, Ghost, reeds, relays, etc. system and weighed 32 oz., the second 1949.” Our first response came from John was a glow head version that ended up Come on, some of you R/C “ Early Worth, Executive Director of the weighing the same but with lead in the Birds” , send us a show-and-tell on your Academy of Model Aeronautics. Al­ though we first saw John flying R/C at a getogether in Hampton, Virginia, at Langley Field, around 1957, he had already been into radio control at least 10 years. In fact, John, and Don Brown, of New Jersey, independently devel­ oped Galloping Ghost, a sort of "Pranc­ ing Proportional” rudder and elevator control from single channel. Here is John’s report on his ‘First R/C’ (note photo). "It was quite radical for the time (1948) and would even be unique today. An The "U ni-Rod", a clever coaxial control system developed by Ted Strader, of Special Edition original design which I named ’Cement Plans. Box 2555, Schenectady, N.Y. I2309. Very compact, and saves weight.

Byron Godberson tunes the engine in one of the Byron's Originals Bob Violet is literally up to his elbows in Skyhawk ducted fans! Part Mig 15 ducted fan ships flown at Mile Square following MAC Show. of ducting came loose during flight demo at Mile Square.

10 R/C MODEL BUILDER Walt Schroder receives plaque from Dick Barnard, MACS Chairman, AMA Executive Director John Worth’s first R/C, built and flown in at roast given in Walt's honor. Susan Schroder looks on. 1948, and featured in a 1949 Air Trails. See text for more info.

The prototype Byron Originals P-51 hums down runway at Mile Square. Scale size 4-blade prop Byron Godberson took o ff and flew P-51 at is turned by 60-powered Byro Drive Belt reduction unit. Mile Square. Dean Copeland flies most demos. first R/C model aircraft. "Good Deal Remote Controlled Blimp” ; blimps, not including the control gon­ By the way, we have plans for Alex 15-1/2 feet long by 5-1/2 feet in diam­ dola, but with tether lines and harness, Schneider's three-time Nats R/C winner eter, 21 ft. long by 7-1/2 ft. diameter, and (1952, '54, ’55) and would like to do a 24-3/4 ft. long by 9 ft. diameter. The Continued on page 109 "Famous R/C Aircraft’' feature on it. One of the early reed control ships, it was flown with a Rockwood ("Rock- head") 5-channel system. Can anyone put us in touch with Alex? He’s in the San Francisco area. R/C LTA GOES BIG TIME The inaugural Indoor R/C Record Trials held at the IMS Pasadena Trade Show has brought about an interesting set of circumstances. Kit manufacturer Bob Peck (Peck-Polymers) who entered the LTA (Lighter Than Air) trials with a twin-balloon "blimp", has, in a very short period of time, found himself in the R/C blimp manufacturing business. As a result of publicity on the trials, Bob was approached by an advertising company to build an R/C blimp to be used in miniature Goodyear blimp fashion at large weather-protected gatherings, such as in the Houston Astrodome. Taking the next logical step, Bob is now producing stock units and has issued a catalog of three sizes of the

AUGUST 1979 11 INSTRUCTOR

Conducted by D A V E BRO W N 8534 Huddleston Dr. Cincinnati, OH 45236

• I know that this is supposed to be a high speed needle valve is adjusted control the airplane in pitch even if a column on flying techniques, but I have properly. I find that every engine is control horn, clevis, or pushrod fails. had so many people asking me how to slightly different in the way it unloads in I've seen many airplanes saved by this adjust and set up their engines that I will the air, and the ways they must beseton after mid-airs. The second and referred- spend some time this month giving you the ground in order to get a good to advantage is the ability to use the some of my ideas on engine set-up and performance in the air might vary. Once elevators as a trim device. This is a last operation. I usually prefer to use a single you have gotten it set to perform well in resort way to compensate for some vent tank with the vent connected tothe the air, it should never be changed more other deficiency in the airplane. The muffler pressure fitting. This type of tank than a few "clicks,” and if morethan this effect is as follows: offsetting one must be filled through the fuel feed line, is required, you probably have gotten elevator higher than the other will and I fuel it behind the filter to avoid some dirt in the system. Unfortunately, induce a roll in the same direction when running fuel both ways through the Harvard’s Law applies here in spadesand up or down elevator is applied, while filter. If a pump is used, the filter should it goes like this: ‘‘ Under the most increasing the throw of oneelevatorwill be installed between the tank and pump carefully controlled conditions of tem­ roll the airplane in opposite directions as and the tank line disconnected from the perature, pressure, humidity, and other up and down elevator are applied. I filter to refuel. The fuel tank should be variables, the engine will perform as it haven’t had to resort to this yet, but I mounted as close as possible to the damn well pleases!” know some who have, with varying engine and as close as possible vertically On to some letters. degrees of success. to the center line of the carburetor. Dear Dave: / have been reading all of Dear Dave: What is the best way to Mounting the tank fairly tightly in foam your articles in MB and enjoy them very cover regular foam, as in wings and the rubber seems to work best to avoid fuel much. I am sending this letter in regards fuselage? I have a foam Spitfire ΜΚ-Ί foaming problems. Make sure that the to a couple of questions I have. and I was thinking of just putting on the vent line can’t be shut off inside the tank I recently purchased an S.T. X45 R/C covering, but is there a better way? I'm if the top of the tank is pressed down. (I with tuned pipe. I know from one of going to give it a war covering so it will cut a small slot in the top of the tube to your reports that the pipe has to be have to be two colors. Should I cover the avoid this.) Make sure the tank clunk adjusted to the engine. There is also a fuselage or just spray it with something? moves freely throughout the tank and is measured distance between the engine Also, what is the best substance to make 1/4 to 1/2 inch from the back of the tank and the end of the pipe. I don't know the foam perfectly (or close to it) with the nose up. where to start, as no instructions came smoothi’ What would be the best paint Now that the tank is set up properly, with the pipe. I have used S.T. engines for a styrene canopy, and it shouldn't mount the engine solidly using socket- for a number of years and like them very peel or crack off. Please send a prompt head cap screws and hook up all the much. reply and try to be specific for my sake. goodies (fuel line, throttle, linkage, The second question has to do with a Sincerely, C. Durrell Cilcreose. muffler, etc.). Now, start the engine and Dirty Birdy 40 I built. The instructions Dear Durrell: Sorry I didn’t get to your adjust the high speed needle for normal say that the split elevators are for fine earlier letter, but combining it with this mixture (just a little on the rich side of trimming the plane, and I am wondering one, I’d assume your Spitfire is a small peak). To adjust the idle, I have a favorite if you could possibly explain this opera­ one of about .10-,15 size, so light weight trick which always seems to work well. tion, as no instructions were included in is of the utmost consideration. Keeping After the engine has been idling for the kit. Any help would be greatly this in mind. I’d probably cover it with about 10 seconds or more, pinch ther appreciated. Thank you again. James D. one of the low temperature films such as fuel lineand listen tothe way theengine Dowler. Solarfilm or Econokote. If you decide to dies. It should increase in speed slightly Dear Jim: On your X45, the manifold paint it, I’d try covering it with 3/4-oz. and then die. If it increases a lot before supplied for the tuned pipe has an “ O " glass cloth and epoxy glue (not paint). dying, it is set too rich at idle. If it just dies ring sliding adjustment, so I’d start with Use the slow-curing type, then sand and straight away with no slight increase in the pipe at about the midway point and paint it with an epoxy paint, using satin rpm, it is too lean. After this adjustment adjust in or out for peak performance on or flat hardener for a realistic look. The is made, try sudden acceleration from the ground. From this point I would fly it same epoxy paint can be used to paint idle to full throttle. It should accelerate and adjust it according to my earlier the canopy lines, but if you are brushing quickly with a slight richening at mid­ column. The only one of these engine/ it, don’t thin it too much, as the thinner range, You may have to fudge the idle pipe combinations I’ve seen runs great could attack the canopy. adjustment slightly to get this. Now, I at 10-1/2 inches between plug and high Dear Dave: I have an RCM .40 Trainer prefer to set the idle speed with the point of the pipe. with which I managed to get in a very throttle trim lever, and I set it so it will The separate elevator horns and few flights.. . via a buddy box cable. .. just barely idle with the trim lever all the pushrods are a good idea for more than before getting socked in (or the winter. I way down and the fuel tank almost one reason. First, separate pushrods give empty. Fly the airplane and see if the you more safety due to the ability to Continued on page 102 12 R/C MODEL BUILDER P Y L O N ’rurnfln/ By JIM GAGER KUĚ*Ěi L G ttf

IT’S ON!! IT'S ON!! IT'S ON!! nately unable to attend the CIAM meet­ What’s on?? The Form I NMPRA ing due to illness. This means another Championships at Las Vegas this year. year of uncertainty which may well For sure! result in a further disastrous loss of I had an opportunity to speak with interest. Bob Smith at his Bob Smith R/C Aircraft The writer feels that the only way in booth while at the Toledo show. He which the above situation can be reme­ informed me that, unless something died is for all interested parties to come drastic should happen between now to some solid agreement on the rules and the race, we (hopefully me too) will which we require and present a united be at Vegas. Stay tuned. front to the next CIAM meeting with a * * * recommendation that the resulting rules be frozen for at least 4 years. I received a letter a short time ago Obviously, the problem is to agree on OÍ from a gentleman in England, and his a set of rules which satisfies everyone. timing couldn't have been better. The Personally. I will build models to any subject has been on my mind for some rules which are guaranteed a life of Dick Tichenor, c/o RCM. 120 W. time (many other people’s also, it turns more than two or three seasons. Sierra Madre Blvd., Sierra Madre. CA out) and his timeliness prompts this As a starting point for discussion, let 91024. USA. column. Let’s turn things over to Dave me put the European view as I see it. Manfred Pick, 8752 Horstein. 1M Sand Day for a moment: 13. West Germany. Gentlemen. Most fliers would prefer to retain the existing model and motor sizes with Goran Karlsson, Havsfruuagev 20. 161 This letter is being written in an 38 Bromma, Sweden. attempt to promote correspondence about 50% wanting to use a fuel with some Nitro content. There is a problem Victor Casutt, CH 8154. Oberglatt. between all those of you who are inter­ Switzerland. ested in creating a truly worldwide FAI in obtaining Nitro in some countries, but those countries don't seem to be inter­ Guy Brouquieres. 4 Place Salengro, Pylon racing class. 31000 Toulouse, France. At the end will be found a complete ested in pylon anyway. Most European countries now permit the use of tuned G. Desgruelles. 1846 Ave Roger Salen­ list of all those who will be receiving this gro, 92370 Chaville. France. letter. If any of you write to each other pipes on FAI racers. This is not strictly to FAI rules, but is generally considered to R. Morell, 2 Rue Chateau De Wulzin. and send me a copy. I will try to keep all 1180 Bruxelles, Belgium. of you up to date on anything relevant at be justified on the grounds of noise reduction. The Matrix system is not very Tony Dowdeswell. 11 Patterdale Close, regular intervals. From now on. you will Dunstable. Bedfordshire, England all be receiving copies of the newsletter much liked, and most contests (all contests in Britain) are flown to a system The letter was received just prior to of the British Miniature Pylon Racing the Toledo show, and there was an Association (BMPRA). of timed heals culminating in semi-finals and a final. One reason for the matrix NMPRA meeting held during the show. If you have any suggestions for addi­ The meeting was well attended, with tions to the above list, let me know as system being disliked is the tendency for all the fastest fliers to gravitate to one approximately 60 interested people soon as possible. showing up and hearing what was going Now. to business. frequency so that they do not have to fly against each other. on in many areas. When the meeting was The present FAI pylon racing rules opened up to the floor, one of the less have, in the past, been very popular in No doubt other parts of the world, heated subjects brought up was Inter­ Europe and Australasia. Unfortunately, and individuals, have their own views on national Pylon Racing. Seemingly, from other parts of the world, notably the what constitutes the ideal set of pylon the positive response from the at­ USA. have been less enthusiastic. rules. Well, let’s hear them. tendees, there is a strong renewed At theendof 7977, Mr. Adam Saltier of Your sincerely, Dave Day, 4A Bushey interest in this country to get involved in the U.S. became the new chairman of Grove Rd., Bushey, Flerllordshire, WD2 FAI racing again. the FAI Pylon Sub-Committee. This 2)Q, England. In case you weren’t around back then, gentleman’s sole claim to fame was that Hal deBolt, 49 Golden Court, Buffalo, the U.S. was very dominant in this event he succeeded in getting the existing well NY 14225, USA. until about 1973 or '74, when interest in established rules returned to a provi­ jim Gager, 3727 Shepherd Lane. Fort this country died out. At that time. FAI sional basis. The resulting uncertainty Wayne, IN 46815, USA. (or Formula II, as we Americans called it. about the future of the class produced a Cliff Telford, 8612 Rayburn Rd., Be- the two being almost identical rules- marked drop in European interest. thcsda, M D 20034, USA. wise) and Form I races were held in In late 1978, Mr. Saltier was replaced Mike Smith, 4 Benstead’s End, Great by Mr. Hal deBolt, who was unfortu­ Wilbraham, Cambridgeshire, England. Continued on page 96 AUGUST I979 13 ALDRICH

• We had a very intriguing letter awhile back, and answering it presents some very interesting thoughts. Dear Mr. Aldrich: I've been arguing with a couple old modelers here lor a long time about P.O.Box 817 17119 S. Harvird long stroke engines making more Edinburg. TX 78539 JOE KLAUSE Garden·, CA 90247 torque. Now I see in the latest MB that P.O. Box 2699 Bill Northrop and Dave Brown believe Lagune Hills, CA 92653 the same thing. Please tell Mr. Northrop and Mr. Send in your questions, relative to glow or ignition engines, and these Brown that within bounds, bore to experts will give you the correct answers. stroke ratio isn’t very important, and that the timing, size, and shape of the intake; size and shape of the crankcase; timing, size, and shape of the bypass; size and shape of the combustion chamber; size and timing of the exhaust; and the ratio of the rod length to stroke length, all are much more important in trying to get more torque in the right range of rpm. I know there isn’t too much anyone can do about it after it's made, but the newer engines are making a lot of torque besides the high speed stuff, and if people start buying engines just because they have long strokes, they are going to be disappointed. Yours truly, Terry Rimert. Dear Terry: To a point you are right, for decreasing the stroke (or increasing it) by 20% will only affect power by approximately 6% (See graph). And, if you want to compare a "square” engine of .9375 bore and stroke to an "o v e r squ are” set-up o f .972 bore to .875 stroke, you will find very little difference in output, that is, in horsepower, all things being equal. Now, horsepower is a function of crank­ shaft speed, and make no mistake, there is no substitute for revs when it comes to producing horsepower. You are talking torque though, and torque is calculated via Brake Mean Effective Pressure, or BMEP: BMEP (lbs./sq. in.) = BHP x 33,000/ L X A X N W here : L = Length of stroke in feet

Two views of the new 1.2 cu. in. Fox Twin, shown alongside a ruler to give an idea of the size of this brute. Weighs 2-1/2 lbs., is claimed to put out over 3 horsepower. The $250 price tag includes the specially machined mount and fuel line " Y " fitting to get fuel to both carbs.

14 R/C MODEL BUILDER A = Area of piston in sq. in. N = Number of strokes per minute RPM TEST DATA 33,000 = 1 hp, i.e., 1 hp = 33,000 ft./lb. 15% NITRO FUEL per min. AND PROPS ENGINES Torque = BMEP x Swept Volume in cc/ Testors Cox Cox KK 1236.5 8000 Black Widow Golden Bee Custom Cox Competition 5x3 17,100 16,100 15,600 18,500 No matter how one plays with the Cox Competition 5-1/2x4 14,200 13,600 13,100 16,000 numbers, the long stroke engine is not Tornado nylon 5x4 16,200 15,200 14,700 17.900 superior to our present short stroke Top Flite nylon 5-1/4x4 16,900 16,000 15,500 18.400 (relatively) designs in terms of low-end Testors 5-172x3-1/2 14,200 13,700 13,200 16,100 torque, as torque is totally a function of displacement and thus with a longer stroke, for a given displacement, there is Speaking of Fox, we just received engines. a definite loss in gas pressure due to the Duke's new 1.20 cu. in. twin. We had to On the day of the tests, the tempera­ reduction in piston area for gases to wait our turn to get one, but friends, let ture was 69 degrees, dew point 50 push against. Long stroke or short me tell ya, it’s one hell of an effort. We degrees, sea level barometric pressure stroke, small bore or large bore, these can hardly wait to get it running, much 29.93 inches, and the test elevation was factors balance out exactly .. . until it less flying. The overall workmanship 1200 feet above sea level. The four comes to crankshaft speed. The advan­ alone is worth the price, if only for engines were all thoroughly broken-in. tage of the long stroke engine be­ collecting purposes. More later on this, The Testors 8000 and Cox Black Widow comes readily apparent when you con­ but we just ordered another twin and and Golden Bee engines were stock sider that its displacement rises in direct two side-exhaust Eagle M’s, partially configuration. The fourth KK engine was proportion to its stroke, while increases made from half of the twin. a Cox Black Widow which had been in the bore are effected by a factor of NOTE: We’ve changed our address. modified as described in last month’s 3.1416( IT I.Theotherrealadvantagetoa All correspondence should be directed issue of R/C Model Builder. The ta­ long stroker is that, due to its smaller to us at P.O. Box 817, Edinburg, Texas chometers were a Royal ProTach and a diameter bore, it has a much more 78539. · BWT Accutac. Both are excellent ta­ efficient combustion area due to the chometers with the capability of easily reduction of piston crown area (less heat KLAUSE indicating rpm’s in one hundred degree per sq. in.) and a more efficient combus­ increments. In fact, with the Accutac, tion chamber. • Last month we discussed custom you can clearly read fifty rpm differ­ The confusion about long strokers vs. tuning to tap the potential of a reed ences. Each rpm which is shown is the short strokers probably goes back to the valve engine. That may have brought average of four readings .. . two from purpose for which they were intended. knowing smiles to the faces of some each tachometer. Thus, while the read­ Most big-bore, small-stroke engines veteran reed valve racing fans. Others ings are not absolutely accurate, they were intended for high rpm speed work, may have dismissed it as just some more will give you a good relative comparison and vice versa. I remember a conversa­ media demagoguery. Well, since the of performance. tion several years ago with speed mer­ proof of the pudding is in the running, I With respect to props, I chose only to chant supreme, Chuck Schuette. We went to the test stand with four engines, test props that might be used in Class I were discussing bore/stroke ratios and a handful of props, a couple tachome­ 1/2A Mouse or Scale racing, since they he recalled that regardless of the bore/ ters, and some fuel (15% nitromethane, are the only AMA competition events stroke ratio, he could make any engine 65% methanol, and 20% Klotz KL-100 which use reed valve engines. The Cox, turn the same on whatever prop, just by racing lubricant). My objective was to Top Flite, and Tornado props are adjusting the port timing to do the job at gather some representative statistics so usually available in good hobby shops. hand. (By now I hope everyone under­ that you could better appreciate the The Testors prop is not as commonly stands that an engine with low exhaust performance potential of reed valve Continued on page 106 timing means one that will have a longer power stroke, and an engine with "high’' timing must be turned at higher revs to make up for the loss in power stroke.) All these advantages for the long stroke design are real, but in spite of the increase in better combustion chamber and porting, they can be cancelled, many times, simply by lowering the cylinder in the crankcase. That is, if swinging a bigger prop is your objective. If you want a perfect example, think of the Fox .35 stunt engine! Tell us about another engine that delivers steadier power at low rpm. Long stroke . . . phooey! It has a .800 bore (same as the old Dooling .29) by ,700stroke! Nuffsaid! Additional formulas: Cu. in. disp. = (3.14 x D- x S)/4 = .7854 X D- X S Where: D = cyl. bore S = stroke BHP = PLAN/33,000 Where: P = BMEP L = Length of stroke in feet A = Area of piston in sq. in. An inline twin built some I5 years ago by Otto Bernhardt. Was actually two K&B Stallion .35's N = strokes per min. joined together, with a distributor in the rear. Knob above rear cylinder was for adjusting the 1 cu. in. = 16.387 cc spark timing. Now owned by Walt Parker of Salinas, CA. Photo by R.M. O'Grady.

AUGUST I979 15 The 1979 MACS Show attracted an impressive lineup of both scale and non-scale choppers. Curtis Croker's Rev-olution I, by American R/C Helicopters, in foreground. CHOPPER CHATTER By JOHN TUCKER PHOTOS BY AUTHOR UNLESS NOTED

NEW CONTROL SYSTEMS however, it can now be modified to a new rotor head similar to the Bell Jet Perhaps the biggest news to come out rigid-rotor, flybarless system which Ranger but on an appropriately smaller of Kavan this spring is the announce­ makes the cyclic response much quicker. scale, new style see-saw with mixers and ment of the soon-to-be-available new The existing main rotor head has been all brackets, components, etc. to convert control systems designed to firm-up changed by eliminating the stabilizer to collective. The new No. 3080 servo control response and to accommodate bar and paddles and the mixing lever. mounted mixers and associated control the new main rotor heads for both the Control input goes directly to the rotor linkages are included in this kit. Bell Jet Ranger as well as the Alouette 2 head and blades without mixing or 3) Alouette 2: Modification kit No. choppers. The available modifications reduction, thus making a very sensitive 2500R. Rigid rotor, flybarless, collective are so numerous, perhaps it would be a system, more than suitable for loops and pitch. This modification kit possesses all good idea to itemize them and take a rolls. the rigid rotor and collective pitch ad­ little time to discuss their individual 2) Alouette 2: Modification kit No. vantages. Like the Jet Ranger’s rotor features. 2500A. Collective pitch, with flybar and head, it is equipped with thrust bearings, 1) Alouette 2: Modification kit No. paddles. The Alouette 2 kit may be thus withstanding the high centrifugal 2000R. Rigid rotor, flybarless, fixed purchased with collective pitch in­ forces without binding. The kit also pitch. The fixed-pitch Alouette 2, as cluded, or you can modify your existing includes lead weights for the main introduced in 1976, will be continued; model. The kit includes a completely blades to increase stability and control

Side and front views of the new Kavan control system, shown here installed in a Jet Ranger. See text for more details.

16 R/C MODEL BUILDER Kavan's new glow plug clip features a self-contained battery (center), Clever blade angle measurement device from Kavan comes with a or leads to connect to a separate battery (left). Charger on right. wedge for setting the blades at 6°. hovering angle for most choppers. response, as well as a new hard rubber chase the new No. 3080 mixers and damper for the yoke! Incidentally, the control linkages. lead weights and damper are available 5) Jet Ranger: New rigid rotor head separately, and are definitely recom­ No. 3303, also available with new control mended for all rigid rotor installations. system modification kit No. 3000R. Rigid 4) ]et Ranger: New main rotor head rotor, flybarless, collective pitch. This No. 3302N. Collective pitch, with flybar rigid rotor head is a larger version of the and paddles. The pitch arm and blade head described in the Alouette 2 modifi­ holder are now a one-piece casting, cation kit No. 2500R (above). A must for rather than a separate pitch arm setting up rigid rotors is a means of cemented into the holder. The see-saw accurately balancing the main rotor has been redesigned to utilize a new system. This requirement is fulfilled by one-piece stabilizer rod, and the blade the new Leveling Fixture No. 3038B. holder bearings are seated in machined Since a slight out-of-balance condition wells instead of die-cast wells. The of the main rotor causes vibration and bearing axles have also been slightly might result in heavy oscillation (due to enlarged (from 6mm to 7mm diameter) harmonic frequencies), this device is an for better tracking and greater strength. indispensable tool. If you already have This much-improved rotor head de­ the Kavan blade alignment fixture which serves the best control system possible, came in your kit. all you need is the ball and it is recommended that you pur­ Continued on page 90

How the self-contained Kavan plug clip attaches to the glow plug.

Improved Kavan rotor heads described in the text. From top to bottom: Part No. 3000R, Part No. 2000R, Part No. 2500R, and Part WITH COLLECTIVE PITCH No. 2500 A.

AUGUST 1979 17 TOGGLE SWITCH

INTERMATIC TIMER/SWITCH

PLUS BATTERY CLIP

POWER PLUG

MINUS BATTERY CLIP CHARGER DIAGRAM NELECTRIC POWER / By MITCH POLING PHOTOS BY AUTHOR Y • Quite a few columns back, I promised sealed, a disadvantage in boats and tions are physically smaller, which is to tell how to build a charger, so on the seaplanes. important in a small model. The connec­ principle that a drawing is worth a The charger does require some solder­ tion gets a better solder joint because lot more than words, here is a drawing ing. I strongly recommend a 25 to 40- there is less stuff there to absorb the heat showing how to connect the charger watt pencil iron and 60/40 rosin core of the iron and give a cold solder joint. In parts. I recommend the power plugs solder. This is always a winning com­ case of a short, these connections can shown because they can carry a tre­ bination. The pencil iron is both inex­ open, which saves batteries, motors, mendous amount of current, and there pensive and versatile and can even switches, etc. Finally, in case of a crash, is no possibility of a short. The ordinary handle the Sta-Brite silver solder sold in the joints will break apart rather than hone plugs with the ball or pointed tip the hobby stores. Soldering is no big tearing up components such as switches, ave a momentary short just before full deal; I always tin the lugs on the plug, charge jacks, and the like. I know, my insertion, which is a big problem when switch, etc., then tin the wire (about 1/4 knowledge comes from crash testing! we are dealing with ni-cd packs that will inch of bare wire), then lay the two This is also the ideal way to connect easily deliver thirty amperes over a together and heat with the soldering servo and switch leads to plugs for the short. I gave up using the phone plugs iron until the solder flows. The result is a radio equipment. long ago, even though they are so easy good clean joint with minimum bother The charger uses extension cord to get, because of smoke and burn and fuss. Notice, though, that I said exclusively, as it is cheap, rugged, problems! The power plugs are available nothing about wrapping the wire lead compact, and handles very high currents on an irregular basis from Radio Shack umpteen times around the connections nicely. I also use it in my planes, since the (depends on the stock that day), or more so that elephants couldn’t pull it apart. parallel molded leads reduce radio reliably from Astro Flight. The Astro This is a constant temptation for anyone noise, much as twisted leads do for Flight female plug is particularly handy doing wiring, so how come I don’t do it servos. The box for the charger can be compared to the Radio Shack plug; it that way? For a lot of reasons . . . repairs anything; I usually use one sold by Radio mounts in the model with a single hole are much easier if the connection is a Shack for electronic projects. One last and isfairly waterproof. The Radio Shack simple one, just heat it and the leads are item: the toggle switch will short out the socket needs three holes and is not apart again for the repairs. The connec­ resistor in the on position. This is to get maximum current when charging by the Astro Flight method. Last month I talked about R.O.W. with the Astro 020. Since then I have found that conditions have to go to be just right to get R.O.W.’s; I guess I got lucky and hit a couple of good days in a row (no pun intended!). There is still a lot of work to be done to get reliable R.O.W. takeoffs from the R/C 020 sized planes. Anyone who has successfully done consistent R.O.W. with single-motor R/C power planes, please let me know, I’d like the information. However, despite the on-again/off-again R.O.W. experience, my interest in electric power on water hasn't been dampened. In this line, I got the new MRP electric boat to use at the local lake, and I’ve Mitch Poling’s original design "Electric Tern” taxis by on Lake Washington. With an Astro 020, found to my surprise that it's the most conditions have to be just right to get consistent takeoffs. Model weighs 15-1/2 oz. fun since airplanes! It gets up and goes,

18 R/C MODEL BUILDER planes at half power, and looks and acts like a hydroplane racer. I know this boat w ill lead to an electric racing class, and the sooner the better, I think. It looks like a racer, acts like a racer, and impresses the spectators. There were lots of “ I didn’t know an electric could move out like that" comments going around. The boat is available from MRP, 12706 N.E. 124th St., Kirkland, WA 98033 (tel. 206-823-0800), in three options. The kit, When using Deans connectors for motor circuits, Mitch recommends using two connector No. 992, is $35 and includes all running prongs for each wire. Extension cord wire works fine and is inexpensive. gear except the motor, batteries, and radio. I got this one since I already have use it! The boat is also quite watertight. control reversal when the model comes the MRP car with the Jomac Mach 3 As it comes from the kit with no extra towards you. Hmmm, it seems to me that radio (1000 mw transmitter, 20 ampere waterproofing, it stays completely dry the R/C toys may not be a bad thing after speed control). The No. 981 kit for $96 inside even in chop. all. They may introduce a lot of kids to includes the batteries and motor as well, the hobby. Anyhow, the boat handles so Since I can't leave a good thing alone, well that kidsand adults can race with no less radio. In addition, it also includes a I decided to hop it up by going to eight charge cord and a resistor speed control fear of spilling or dumping it. After all cells instead of six. On Sunday I took the the heavy use, the batteries and speed for those who have a two-servo radio. hopped-up version to the lake and The ready-to-run boat, No. 980, has controller were only warm. The motor proceeded to really wring it out by was hot, but not seriously so. That’s very everything for $245, including the Jomac continuous charging and running for an 407 radio (100 mw transmitter, 10ampere good for such abuse, heavy running plus hour and a half. Five-minute charges more voltage than the design called for. speed control). The boat uses the stan­ were good for four-minute runs, and dard roar legal Astro 05 motor and a six­ I am impressed by the fantastic job MRP fifteen minutes were good for seven- has done, and I recommend the boat, cell, 1.0 ampere hour pack which is minute runs. With eight cells the speed standard on the 1/12-scale cars. These are either for fun and racing by the experts, went up by 15% or so, to about 17 to 18 or for the first introduction to electric available in hobby shops or from MRP, mph at top speed. Handling and turning Astro Flight, Jomac, Bolink, and even in power for the novice. Go electric and were just as solid and pleasing as before, have a ball at the lake! · cordless grass clippers (Disston, Black so I’ll leave it at eight cells. I had quite a and Decker heavy-duty clippers). crowd of kids around, so I decided to do I took six hours to put the boat a "consumer test," and handed the boat together, mostly because I didn’t follow over to them. Out of six who tried it, the instructions on the rudder and had only one had orientation problems; the to do it all over again. The rudder is others handled it like pros and had a supposed to be mounted to one side of blast. I found out that they all had the the center line. I put it on the center line, inexpensive R/C cars, the ones that sell and this led to all kindsof problems with for $15 to $35, so they all knew about the flex rod steering set-up included in the kit, so I had to admit the instructions were right and do it over again. I also bent the coupling spring while pushing it onto the motor. This is easy to do, so be careful. I got it straightened out, and it works fine. I also took extra time to wire in an external push-on/push/off switch (a pretty red button!) and an Astro Flight charge jack. This made everything handy, otherwise I would have to open up the boat every time I wanted to charge. I put on striping tape, decals, and painted the driver and cockpit with Magic Markers, and it was all ready to go at 42 ounces all-up. Then to the lake and fun. This boat has lots of virtues and no vices. It jumps up on step at half throttle, hits up to 15 mph on the straights, turns fast, and is stable. By stable, I mean it cannot turn over, flip, or even come close to it. This was astonishing; even hard-over turns at full bore in chop were no problem at all, and this for a little boat only 19 inches long by 8 inches wide. The people at MRP really did their homework on this one. At full bore, the boat is far enough out of the water so that the prop cavitates (hits air) occasionally, but that doesn’t hurt the performance. The icing on the cake is that when the batteries run out, there is still enough current to bring the boat in on idle even from quite a ways out (600 feet in one case). I had my trusty The completed MRP boat, ready to go chasing the ducks. Mitch later ran the boat on eight rescue dinghy along, but never got to cells, top speed was around 18 mph. Handles well, Mitch says it won't flip over.

AUGUST 1979 19 • SNEAKY PETE « « « By D IC K HAIMSON . . . Behind the sorta-looks like disguise is a carefully designed, full-schedule pattern machine. Best of all, it's built from materials that your local hobby shop normally carries, p h o t o s b y a u t h o r • Sneaky Pete is a semi-scale design yaw and dive control was desired. We self. They are great for everything from intended for aerobatic flying of all types. added dihedral as we went by the “ saw & 1/2A to the “ flying forests” seen today. We used the basic layout of the old glue” method. It may be of interest to You may notice that the pictures show Howard "Pete” racer because it offered note that many older well-known pat­ a side-mounted engine while the plans the best set-up for good lateral area and tern designs have suffered from coupled describe an enclosed, upright engine force arrangements. Nothing was really yaw and dive problems. However, most configuration. We have also built the scaled from the Pete; we simply sneaked of the really good current ones are set Sneaky Pete with an upright engine and a few lines and angles we wanted (so up to prevent this problem (Phoenix 8, no cowl. This is probably the simplest much for scale!). Five different models Curare, Tiporare, etc.). The wing plan- arrangement, although it is not as attrac­ were constructed before we arrived at form was not critical on the shapes we tive as the side or enclosed set-up. The the one shown here. Each of the other tried, but note that we stayed with side-mounted version shown in the models differed slightly in various ways, rectangular shapes with round tips or pictures had a tuned pipe on an S.T. such as dihedral, stab area, wing plan- mild tapers with rounded tips, and all X-60. This set-up is fast, but the tuned form, landing gear type, etc. Some with low aspect ratios. pipe placement caused some problems interesting points were noted along the One design factor showed up crystal by shifting the lateral area and making way. such as the Dural gear originally clear. You must use large stabs and big the model dive when rudder was ap­ used contributing to a coupled pitch­ elevators if you want optimum results. plied. The version drawn up for this dive problem. It acted as a down force We used 26% on this design and up to article has all the problems corrected when the model was yawed with rudder. 35% on smaller models. The very low that we could find in previous building Retracts would eliminate this problem, speed flight characteristics are excellent, attempts. We have also tried to give you but we wanted to keep a fixed gear, so and sensitivity problems are taken care the best construction techniques we the wire type gear was substituted for of by the dual rate switch on the radio. could invent (or copy). We left out a bill the Dural. Dihedral was also found to be By the way, if you think dual rates are for of materials because we prefer to strip reasonably critical if a perfectly balanced the contest set only, stop kidding your­ pieces from larger stock as needed and laminate when necessary to get large blocks. The one advantage with this technique is that you purchase wood based on density or grain pattern rather than finished size. I laminate with polyester resin (K&B) or Hot Stuff as required, and have found that the finished parts are frequently easier to use than virgin stock. The benefits are: 1) Better weight selectivity; 2) A built-in “ centerline” for sanding; and 3) Im­ proved stiffness at a low weight gain. All the wood needed for the Sneaky Pete is soft or medium soft balsa, except as noted. Please save the lightest stock for the stab, elevator, vertical stab, and rudder. Frankly, I would use foam cores (Curare or Tiporare wings and stabs are OK) and sheet with dead soft 1/16 if I wanted the best weight-to-strength. The all-wood construction shown is plenty strong if glued properly. Use 5-minute epoxy or cynoacrylate where possible Side-mounted S.T.-60 and pipe is not as pretty an installation as an upright, rear-exhaust engine and laminate the blocks on the fuselage with pipe in forward cowl, but it happens to be Dick's favorite powerplant. top and cowl with polyester resin. This

20 R/C MODEL BUILDER will make shaping and sanding much easier. These three glues are compatible and will keep you from tearing your hair out waiting for resin to dry over slow epoxy or white glue. We will describe construction one unit at a time for quick reference. WING Make 1/16 ply templates of root and tip ribs, including the spar cutouts. Trace around the finished parts, then flip the part over and see if it still matches the traced outline. Sand as necessary until the shapes are absolutely symmetrical. Align the root and tip templates and drill and bolt the rib blanks between them. Use a new 100-grit sanding block to shape the ribs, then razor cut the spar slots. Lightly score the rib positions on the l.e., t.e., and spars, using a fine 1/8- inch flat file. Assemble each panel over waxed paper on the plans, and final shape the l.e. and t.e. with a long sanding block. Add shear webs after the basic framing is dry. The plywood land­ Dick forgot to remove anti-hangar rash padding from landing gear for this photo. Sign of an ex­ ing gear plates may be epoxied in and pert builder ., . glass-like finish with minimum paint . . . but lots of good preparation. the hole for the aluminum rod should be Add the tail post and notch as shown. final fit. Splice the wing sheeting by headrest fairing. Start by making the 1/8 Add the forward fin block and the fin applying Hot Stuff to the joint and then sheet box top. This piece must be symme­ top, then shape the fin block using the passing a Monokote iron over the seam trical. Make identical side pieces from fuselage sides as a guide. Frame the for fast, strong joints. Cut out the 3/16 sheet and add the 1/32 ply doub­ inside fin block and fuselage top with sheeting to cover from the t.e. to the lers using polyester resin. Allow a 1/8- 1/8-inch stock, leaving a 1/16-inch space center of the spar. Lay the sheeting on a inch gap at the fuselage top edge for the for the side sheeting. Add the ribs flush perfectly flat surface and align the t.e., top sheet. Epoxy the firewall and both with the framing and tail post, then add then Hot Stuff together up to the spar. bulkheads to the top sheet, then add the sheeting using Hot Stuff on one side and Flip the panel over and repeat. The sides, using Hot Stuff at the seams. Now panel is now rigid and you should install the 3/8-inch triangle corner Titebond on the opposite side. Carve correct any twists before proceeding pieces using polyester resin and install the rudder using a centerline reference. (this can be done by cutting the sheeting the firewall fillets using 5-minute epoxy. Add the 1/2-inch dowel piece as de­ loose from the t.e. and spar on one side, Clamp tightly until dry. You should now scribed in the stabilizer sequence. then blocking the panel into place and have a perfectly straight, square box MISCELLANEOUS reattaching the sheeting with Hot Stuff). with the wing and stab in perfect align­ All forward fuselage blocks are joined Now add the forward sheeting, using ment. Add the cowl blocks and headrest with polyester resin, then shaped and Titebond. Add the aileron linkage, t.e., fairing using polyester resin to join the cut out for the engine. If you are using and tips, and final shape both panels fillet blocks to the cowl side pieces. the pipe in the top set-up, cut the cowi making certain they are identical in size Carve to shape using a round X-Acto loose at the thrust line as shown in the and shape. (Note: Use a completed draw blade and a dowel wrapped with cowl detail sketch. The finished cowl panel to draw the wing saddle shape on 80-grit paper. blocks should be thin (approx. 1/8 inch), your unassembled fuselage sides before FIN AND RUDDER and a layer of light glass cloth should be joining wings. Ditto for stabilizer.) Align and join the wing panels using Hot Stuff or 5-minute epoxy. Cover the center section with a 2-inch ribbon of 6-oz. glass tape and overlap 3 inches fiberglass drywall tape to provide a 5- inch wide band on the center section. This entire operation can be done in one step, using Hot Stuff to locate the tape and a squeegee to apply the polyester resin in a thin coat. This technique is strong and requires no sanding after­ wards. Cut a 3/16-inch deep half-round notch for the rear gear strut and install the aluminum rod in the l.e., using epoxy. STABILIZER AND ELEVATORS Build these using the steps described in the wing building sequence. Add the pre-shaped 1/2-dowel pieces after the elevators are sanded to shape. Drill the 3/32-inch holes and insert 4/40 bolts, using epoxy.

FUSELAGE This is basically a flat-top box built upside down, then flipped over and Author-designer-builder-flier-etc.-etc. Dick Hanson with "Sneaky Pete". No, that's not Mono completed by adding the cowling and kote. Black and International Orange ship is finished with K&B Super Poxy. AUGUST I979 21

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AUGUST I979 "Sneaky" going away. Dick also designed the Tiporare, which w ill be featured soon. It's making it's mark in pattern competition and is currently Dave Brown's favorite flying machine. added for strength, using polyester elevator horn set. Swing the gear into 3/8-inch total, elevators 1/2 inch total, resin. Steel pins, brass eyelets, and a position and add the rear wiretotheslot rudder 3 inches total. Dzus or any small panel fastener provide in the wing block. Remove and rebend FLYING a solid mounting arrangement. the rear wire. Use heat (if required) until First check for perfect lateral balance; Add the 1/2 x 1/2 gear mounting it falls neatly against the front wire. Bind add lead to the tips as required. The CG block to the forward bulkhead and cut a and solder, using a soft copper or iron can be 4 to 5 inches from the leading 5/32-inch half-round slot for the gear to wire plus a good acid flux and solder. If edge at the root. Trim for hands-off set in. Add the wing mounting plate and you do not know how to solder, do not ailerons, both upright and inverted (this square up the wing by checking dis­ try to learn on this job. Get help. may require sealing all the hinge lines). tances from each tip to the tailpost. Drill Mount your wheels as closely as Trim for inside loops to the smallest and mount wing with 1/4-20 nylon bolts, possible to the bend to prevent any possible radius before the plane be­ then drill and add the plywood reinforc­ splaying tendencies when landing. I comes unmanageable. If it always breaks ing plate to the wing bottom, using 5- know this gear looks unusual, but it was out one way, check the elevators for minute epoxy. designed to rip off, not out, in a con­ equal throw. If it simply drifts sideways, TAIL WHEEL trolled crash such as when trying to taxi try rudder correction. Add tip weight as Center drill a 1/4-inch maple dowel over a curb stone at 30 mph. a last resort. Trim for outside loops in the with a 3/32 drill bit. Drill a 1/4-inch hole FINISHING same manner. The amount of stick in the sub-fin and up into the fuselage, Sand the entire model smooth with pressure required for inverted flight then mark a 1/4-inch slot in one side of 180 to 320-grit sanding blocks. Vacuum depends on CG, down thrust, linkage the sub-fin to intersect the 1/4-inch thoroughly and brush on a very thin coat slop, servo dead band, and level upright hole. Cut the dowel in half and epoxy in of polyester sanding resin (K&B). Sand trim setting (hands off). Do not start place, leaving the slot open. Add the lightly and spray on a heavy coat of K&B shifting the CG and down thrust until 3/32-inch tail wheel wire bent to the primer in progressive passes. Try to sand you are certain all other factors are desired length. Using a 2-56 bolt and nut it all off with dry 280-320 paper after 2 or correct. Have a good time! · and a 3/32-inch wheel collar, mount a 3 days. Spray on a thin coat of primer, missing link (Rocket City) and add a "Z " this time to see if everything looks OK. If bent wire to connect to the rudder. Bury not, mix up some primer and micro SAFE FLYING a small elevator horn in the rudder, balloons and fill all imperfections. Sand leaving approx. 1/4-3/8 inch of arm into these when dry and spot in with sprayed which to drill and hook the "Z " bent primer again. Now lightly sand to pro­ wire. This set-up will permit adjustable vide an even-colored primer base. Your steering and replaceable tail wheel legs. paint job should now be layed out and MAIN GEAR sprayed on. The entireairframe, painted, Bend the front piece cold and make but without any gear, etc., should weigh certain it will lie perfectly flat on a flat between 3-3/4 and 4 lbs. Ready-to-fly IS NO ACCIDENT surface. Install the front piece on the weight will be 7 to 8-1/4 lbs. Control fuselage using plastic plates from an throws should be as follows: ailerons

Relieve the flight judges from hours of lookalike pattern ships. No fancy molded parts, just materials from your local hobby shop.

24 R/C MODEL BUILDER DRIVER OF AIR PART TWO By D A V E T H O R N B U R G . . . Twelve hot tips on thermal flying, stolen from Dave's more successful com­ petitors. Good advice for hackers, Thackers, grocery packers, and just about anyone who flies sailplanes. • In last month’s sermon, brethern and circling first in the direction that felt don't lust after his thermal unless you cistern, we talked about visualizing the right instinctively, then trying a turn in have altitude to burn, because playing wind as if it were a “ river of air” flowing the opposite direction to be sure he musical thermals down close to zero across the flying field .. . a river that has hadn't missed anything. Somewhere altitude is risky business. "Normal” glide a few bumps and swirls and eddies in it, along the perimeter of one of these two slopes don’t mean a thing in the vicinity but basically flows smoothly and uni­ circles, the tail of the ship would usually of thermals. In their low, formative formly in a straight line for long periods rise up and go on step, or one long wing stages, thermals are associated with what at a time. This river almost never flows would suddenly twitch upwards, or the always seems like a ridiculous amount of “ down the field” or "across the field,” entire plane would “ come alive,” bob­ down air nearby. Hop out of a low core, because field boundaries don’t mean a bing about weightlessly and responding no matter how weak, and you’re likely to thing to it. Fences and tree lines and to every tweak of the stick . . . and Rick get socked in the turtledeck with a mass roads are important boundaries to the would know that he’d located the of falling air that feels like a month’s human eye, but to the riverof airthey’re thermal’s hot core. dirty laundry. just so much silt in the riverbed. Our This figure-eight pattern is certainly This sad experience has caused a lot flying field may be laid out very ac­ worth remembering; I use it often to of pilots to adopt the rule of never curately by the compass, but the com­ core out soft bubbles, but you want changing directions once they’re circl­ pass has 360 degrees, so the odds against to keep in mind that the figure-eight is a ing in a thermal. I've heard this rule the wind aligning itself with any of our luxury pattern, one that you can’t afford repeated so often by so many different field boundaries are 359 to one! This to use if you don’t have altitude to spare. fliers that I’ve come to think of it as a point may seem too obvious to belabor, When Rick flew into Dave Shadel’s kind of soaring superstition: “ It’s bad but you’d be surprised how many good thermal twenty feet off the deck (see last luck to switch directions in a thermal.” pilots try to follow thermals “ down the God will get you for it. If not now. then field.” Thermals don’t move down the month's sermon) he had no time for fancy search patterns .. . it was stick a later . . . maybe in your sleep (If you field, they move down the wind. wing into what felt like the core, and think I don’ttakethis“ rule” tooserious­ Which brings us to hot tip number ly, you’re right.) Still, it has a core of one for thermal flying: drift with the lift. spin on it! And that brings us to hot tip number thuth, like most superstitions: when the New pilots, particularly, tend to forget three: especially when you’re low, stay lift is small and low and violent, it's that the river keeps right on rolling with what you've got. Don’t get in the foolish to risk driving out into down air along, even after they've found their habit of thermal-hopping, looking for just to change the direction of your thermal. The river doesn’t pause with “ better" lift, if you want to do well in circle. Thermals don’t know or care awe and delight to see their “ Earth- contests. When you’re forty feet above whether you turn to the left or the right. banger 900” spiralling magically up­ the weeds and struggling to stay alive in And that's a fact. wards into the sky; it flows right on what feels like a mere gopher belch, Closely related to the “ stay with what downstream, as if model airplanes hard­ don't be tempted to bail out and dash you got” rule is the rule that says There ly mattered at all! You simply can’t for somebody else’s lift unless it’s really ain't no zero lift. I learned this years ago. anchor a drifting thermal by circling in it, close to you. You can covet your neigh­ flying with a "thermal sensor.” one of no matter how smooth and round your bor’s manservant, or his maidservant, or those clever little airborne transmitters circle. If you don't relax and let the even his ass if you're so inclined, but Continued on page 98 airplane drift with the lift. .. if you don’t give up your visual orientation to the earth and focus instead on the invisible «•uW, wind . . . then your thermal is likely to wander away absentmindedly and leave you circling underneath a waterfall of cold, heavy air. Even on a “ dead calm” day, when the river is sluggish and erratic, hardly flowing at all, the core of a thermal seldom remains stationary for very long. It tends to move off in one direction or another, probably under the influence of “ local” high and low-pressure areas. (I’ve spent the last month learning to fly a pair of 54-inch hand launch R/C gliders, and I’m still amazed at the micro­ weather patterns that occur in areas no larger than a little-league field.) Ther­ mals are high-energy creatures; like 10- year-old kids, they aren’t likely to sit still for long. Hot tip number two comes from one of last m onth’s heroes, Rick (White Trash) Walters. Whenever Rick flew into the area of rising air, and especially if the lift was weak, he used a very consistent search patterm to locate the thermal's core. He would fly straight only just long enough to be sure that it really was lift, ‘With afresh haircut, you can feci thermals on the back of your neck' then execute a very smooth figure eight,

AUGUST I979 25 Dave Thornburg's "Bird of Time" is now being kitting by Marks Models. In spite of its antique Mark Smith launching his Bird. Wing design appearance (sorry Dave), it's a hot ship. Steve Work won first on U.S. team with one. similar to some Jasco kits of the late ‘30's.

by Dr. L A R R Y FOGEL. * c S O A R IN G PHOTOS BY AUTHOR • R/C soaring is for everyone! Suppose find what you're looking for. What a you’re out to do your very best. you’re an introvert alone in an open great feeling to be aboard an unseen Or still better, you find a suitable slope field. The sky is unlimited. You stretch elevator. You decide when to leave the where you can demonstrate your aero­ the hi-start, check the control surface lift (when your plane begins to disap­ batic skill to other pilots and spectators movement, lean back, level the wings, pear or when you get greedy for an even alike. You heave your craft out into the then launch. A soft swish and you ease stronger thermal). You patrol the hori­ lift, climb, then dive for speed and back on the stick to get those extra few zon . . . all the way around. Is there any perform inside and outside loops, axial feet of altitude. better way ot get in touch with nature? rolls, an inverted pass, a spin, a hammer­ Now it’s slow motion. Your bird finally Suppose you’re an extrovert. You trek head, a Cuban eight . . . and whatever slips off the hook into free flight. You sail the contest circuit with others of like else comes into your head. What a great upwind, searching for bumps in the air, mind. Now it’s your turn at the winch. feeling of accomplishment. then tour above the horizon until you You tighten up. The tension tingles, and Suppose you’re the "thinker." You

Two shots of Arlie Simpson's "W indfreak" flying wing, designed by Roger Sanders and recently featured in RCM as a construction article. Combines good looks with good performance. This is one flying wing that can hold its own against most any "norm al" sailplane.

Spencer Wirner has been terrorizing the skies of Torrey Pines with The "Two-Yard Canard," by San Francisco s Bill Kaiser. Looks fast, this outrageous flying saucer. Flies well, is 34" in diameter. is said to be fu lly aerobatic. Nice to be different.

26 R/C MODEL BUILDER Lloyd Standley's "Super Profile" was inspired by profile U/C models. Radio in the Super Profile is neatly mounted in the hollowed out uses Ridge Runner wings sawed off to 54 inches. cheek cowls. This particular model belongs to Murph Misiewicz. watch birds fly. Not simply to enjoy the unique opportunity to convert modern national R/C Soaring Championships in beauty of their soaring, but to under­ technology into moments of joy. Belgium. This plane is designed around stand the mechanism of their flight. If this isn’t enough to convince the the concept that it's more important to Which way does the tail tilt for turn newcomer, take a look at this gaggle of find thermals than use them efficiently. control? While waiting for the bus, you geese. Mark's Models (P.O. Box 2134, Thus, the very low wing loading and thin wonder about an annular elliptical wing, Escondido, CA 92025) is now kitting the (9%) airfoil. Penentration is a breeze. tilted back so that the upper portion Bird of Time, designed by Dave Thorn­ This clean bird slips through the sky until becomes the elevator and the sides burg. Don’t let the Old Timer looking you find the bump you’re looking for. provide lateral stability. Deadly dull wings fool you; it’s no antique. This is meetings are compensated by doodles the standard class plane the Steve Work Then you back off and circle and let the which focus on airfoils and control used to win first place in the most recent thermal do the work. I have flown the mechanisms . .. “There must be a better FAI team selection conducted by our Bird of Time; it handles well and does way to couple spoilers to flaps." National Soaring Society. What’s more, I the job. Suppose you're the "doer.” You expect he’ll go on to win the Inter­ Continued on page 77 watch your plane bore holes in the sky. "How close can I come to terminal speed and still pull out safely?” You’re impressed by the swish as the plane levels out overhead, even though you know that efficient flight is quiet flight. And the doer can also be the crafts­ man, building (or rebuilding, which is far more difficult). You convert outlines into material more efficient than the birds (yes, more efficient in terms of L/D in order to compensate for being unable to fully sense the local environment and modify planform and airfoil at will). And tne doer can also be the pilot . . . contributing intellect to animate mechanisms that are at home in the air. You're the artist . . . creating beauty in the form of dynamic sculpture. Fragile fragments that glide gracefully in smooth sequences. These statues need no pedestals. But you’re all of these things rolled into one. All the better to enjoy this

Side and 3/4-top views of the automatic constant tension device dreamed up by Clell Dildy of Panama City, Florida. A sketch is shown above for those who might want to try their hand at making one. The unit makes for very smooth launches, should be just the thing for beginners.

AUGUST 1979 27 Only Bill Stroman could come up with something like this and make it fly well. Photo was taken at the 1979 Pasadena IMS show, where Bill's Taube copped top honors in the F/F Scale category. Power is a D.C. Merlin .049 diesel swinging a 7x4 Top Flite prop. plugs are easy to forget, too. How about extra engine mounting screws or bolts? On the field: Do an antenna-off range check. This is even better with the engine running so that you may evaluate Tke 1 2 vibration-caused problems, too. Check a our propeller for nicks and cracks / - scm efore every flight. The price of injuries Βγ LARRY RENGER PHOTOS BY AUTHOR from a shattered prop can be awfully • Hey! I found an interesting, profit­ vious flying session and storage. Put all high, and the inspection takes only able, and socially valuable thing to do batteries on charge. about two seconds. Before takeoff or launch, cycle all with old model magazines (except R/C Flight day: Make up a tool box con­ Model Builder, you have got to keep tents list and check that you have controls a couple of times. I have them!). I just gave a zillion year’s collec­ everything. I have driven the 10 miles to launched with the transmitter turned off tion away to the library of my old high my favorite flying site on a couple of once, and receiver off twice, and with an aileron servo unplugged once. I learn school. Here is how it works: they gave occasions, once with no fuel, another really slowly sometimes. me a letter stating that the value of the time sans transmitter. Extra props and collection of some 700 magazines was End of day: Drain yourtank and run all $645. Since my tax bracket is over 30%, the fuel out of the engine. Put some 3- Uncle Sam will charge me about $195 in-1 or similar oil in the engine exhaust, less in taxes next year. That is probably carburetor, and behind thedrive washer. about what I could have sold the maga­ Flip the prop a few times. I like to wrap zines for with a lot of effort. the engine in a clean rag to keep dust Now comes the part I really like. The out. Moisture won’t collect as it can with magazines will now see regular use, and a plastic bag. Clean the model with an be carefully stored. The users will be a ammoniated or alcohol-base cleaner. broad spectrum of potential modelers Inspect all surfaces, joints, hinges, motor for a period over the next twenty years mounts, etc. for damage. Even if you or so. This is a really good move toward have a perfect flying record, parts wear helping out on the Junior problem. In out, fatigue-cracked hinges can pull addition, I can still use the magazines if I loose from flutter or engine vibration. really need them. Hospitalsand military Fuel can soak into small cracks and start bases are also good potential recipients to lift covering materials. of the excess in your magazine collec­ Inspect nowand repair at your leisure. tion. Why wait for the night before a flying BEGINNER’S WORKBENCH session? You may find that you need I finished my Q.B. 10L and promptly some stuff from the hobby shop to make crashed it on the first flight. Whose fault the repair, and they aren’t open late at do you think it was? The receiver had night. gone out of tune from disuse for many On to the photographs! That woman months. Was it the receiver’s fault? with the BIG smile is Charlie, of Charlie’s NOPE! It was my fault. I did not do a pre­ R/C. She is also the wife of Bill Cannon, flight checkout. so any similarities of design in the two When you go flying you ought to have companies’ R/C equipm ent may be a written checklist broken into several more than coincidence. Anyway, Char­ parts. lie sells R/C equipment kits. She has 2 Night before: Check basic radio through 5-channel systems available, function, fuel lines for cracks, structure Charlie, of Charlie's R/C Goodies, shows her and flight packs and all individual for unnoticed damage from the pre- wares at the "79 IMS Show. units are also sold separately. The air­

28 R/C MODEL BUILDER w Eckhardt Calver, of Asheville, N.C., sent in this photo of a fairly One of the engines that our columnist is testing is the Enya .09, a rare K&B Twin Fury. Can any of our readers give us more info on well-built little powerplant that is great for sport models. this engine, such as date of manufacture and running characteristics? borne equipment is available in two One annoying peculiarity of the Enya Control Line Aerobatics. This year, Greg weight ranges. For example, a four- must be dealt with. For some reason, the Brown, an AMA senior, took second channel complete system weighs either exhaust and throttle linkage are on the place in the control line aerobatics 9.21 oz. or 5.57 oz. The heavier system left side of the engine, instead of the category of the show with this delightful has 4 lb. thrust servos and costs $25 less right like most other engines. I have no little model. The PA-2 is its name, and than the lightweight system with 3 lb. idea why this might have been done, but although it doesn’t show in the picture, thrust servos. Receiver is the same in in my case, where I wanted to switch the color scheme is a blue fuselage, both systems, but battery pack sizes vary, several engines on one model, I had to yellow wings, and red and white tail too. rig two complete throttle linkages. Since stripes, a design which dates back to Send a SASE to Charlie’s R/C Goodies, rigging controls is the part of building I between the wars. Greg built his model P.O. Box 192, Van Nuys, CA 91408, for a like the least, it is a significant point. If around a Black Widow .049 and using a price and specification sheet. you build a model with the head off to 30-inch, 185 in2 area wing, kept the Next photo is one I shot at the Inter­ the right side, as is frequently done in weight down to 10 ounces. Wing and national M odeler Show in Pasadena both R/C and U/C, watch out that you stab are plastic film covered, and the earlier this year. Bill Stroman took first don’t get fuel sprayed in your eyes after fuselage is painted with Sig and Aero- place in F/F powered scale. The model is priming the engine. Flooding is also Gloss paints. Wing construction is based an Albatros Taube dating from 1912. Up easier in this installation. on J&K foam cores (they are in Cypress, front. Bill installed a D.C. Merlin .049 On the whole, though, it is good­ CA). An unusual feature for a model diesel which he has swinging a 7x4 Top running, well-made engine that I can styled from the late 30’s era is the tricycle Flite nylon prop. Even so, he does not recommend either for training or sport landing gear. need to run the engine at full power to models. It certainly would be a good I especially liked the fact that Greg fly it. The model was beautifully detailed choice of the scale model set. went to the trouble to put in a pilot. That with engine cylinders, valves, wires, Last model for this month is the one adds a lot to how finished a model looks, pullies, those strange curves in the wing, that stole my heart away at the IMS in my opinion. The pilot in this case scalloped trailing edge, and wire wheels. Show. As you know if you have been appeared to be from a Cox Warhawk. A well-deserved win for Bill, in my reading my column for any length of There is a feeling about this model that opinion. time, I have a real soft spot for 1/2A Continued on page 98 The next photo shows the Enya .09 engine with throttle control. Now that I have repaired the Q.B. 10L, I have been flying with this engine. I added a DuBro Mini-Mufflaire to quiet the engine somewhat, and am really pleased with what a compact combination that makes. Performance is quite acceptable, al­ though still in the intermediate sport category. You aren’t going to do any vertical maneuvers, but it is certainly adequate for rolls, loops, inverted flight, spins, etc. I am really pleased with the throttle response this engine has. In fact, it is hard to set it up so that it can be killed from the transmitter. Idle speed is very slow. One non-functional feature about Enya engines that I really like is their appearance. Something thatspeaks well of the care that goes into the manufacture of an engine is how it looks on the outside. Beauty may be only skin deep, but in my experience, ugly goes all the way through.

AUGUST I979 29 • The Cox Sportavia is a scale model of the Sportavia powered glider. It is handsomely made of foam plastic and comes witn a Cox .049 QRZ engine installed. The Pilot Tiny Ace is an inter­ mediate aerobatic aircraft for Cox TD or Medallion .049 (or .051) engines. It has a sleek ABS plastic fuselage and a built-up wing that comes finished and covered. Since I have been having a lot of success with .049 ARF's recently, and since I enjoy gliders, the Sportavia was a natural for me. It seemed an ideal plane; it could be flown at the slope without the engine, or with an engine boost on the flatlands. At the same time, I am enamored of aerobatics. I remember struggling to get my Craupner Cumulus to do a roll and succeeding finally in a 40-knot gale at a seaside cliff. When I got an aileron- equipped Todi, rolls came a lot easier. Similarly, my Cox Centurion flies great, and with a clunk tank can fly inverted, and do a few limited aerobatics.. . but I needed a ship with ailerons. My choice was, almost by default, the Pilot Tiny Ace. There just aren’t many aileron equipped planes in the ready-built half- A category. BUILDING THE SPORTAVIA There isn’t much tosay about building the Sportavia. And that’s a compliment. The engine comes installed, the empen­ nage goes on with two plastic nuts. The wings are taped together, the landing gear snaps in place (the main gear requires attaching one Phillips screw), and that’s about it. The canopy comes already attached with double-sided tape. The most difficult part is placing the quite attractive stick-on markings. The wing markings are quite large and handling them without wrinkles or bubbles getting into the act, while simultaneously placing them in exactly the right position, is quite a trick. Small PRODUCTS IN USE markings cast into the wings and fuse­ COX HOBBIES' SPORTAVIA and PILOT'S TINY ACE, lage help locate the correct position for the decals. The markings are very sticky, by JEF RASKIN. photos by author and (as we are warned in the instruc­ lieu of a pilot. I refastened the canopy Building the Tiny Ace is quite a bit of tions) once you put them on, you can’t with four small sheet metal screws, one work in comparison to the Sportavia. move them. in each corner. Since the adhesive The wings are already covered, but the The hinges on theelevatorand rudder originally used on the canopy is not two halves have to be epoxied together. are much too stiff. Careful work with a strictly fuel-proof, you will have to do I recommend that you use your heat gun knife (using a light behind the hinges to something of the sort eventually any­ on the plastic covering if it sags. It avoid cutting them) is required to make way. The sticky stuff may be impervious behaves rather like Solarfilm, requiring them free enough to work without to Cox fuel, I don’t know. I have been much less heat than Monokote. The excessive current drain in the servos. having success and hundreds of instants ailerons and elevator have to be hinged. The hinges themselves seem to be starts with Fox Missle Mist, and' the The plastic hinge material that came pieces of rubber bands. Not a bad idea. canopy glue is definitely soluble in that with the kit seemed much too stiff to me, I chose not to use the Cox QRZ potent brew. so I used sewn figure-eight hinges. They engine/muffler that came with the Another advantage of having the fuel are a bit time consuming, but are nearly plane. To get throttle control, I used my in the cockpit is that you can see how frictionless, strong, and incredibly favorite Cox masterpiece: the Medal­ much fuel is remaining. A low fly-by, cheap. Building the ailerons is not too lion .049 R/C with its sleeve-valve with the wing tip grazing your nose, hard, but attention must be paid to the exhaust restrictor. This engine can be gives you a clear view of the tank. control rods. You must drill holes in the throttled down to a purr and will re­ With a good part of the flight consist­ ailerons and epoxy in the wires. The spond to full throttle instantly even after ing of floating around with theengineat instructions are not too clear on this 20 minutes at idle. If the needle valve is idle, the large tank gives over a half hour point, but it is essential that you carve set correctly, the engine is extremely of air time. channels in thetrailingedge of thewing. dependable. Too rich and it dies when After flying the Sportavia in (almost) The aileron linkage must be sunk into you try to open the throttle after idling, stock condition, I found a few modifica­ the trailing edge. If you omit this step, too lean and it won’t idle. tions that made it a much better aircraft. two things happen: the wing won’t fit, To get really long flights, I used a But I’ll save these hints for the "how to and the rubber bands that hold it on will Sullivan 2oz. tank. I pried the canopy off fly it” portion of the article. bind the linkage. I did it wrong the first and mounted the tank in the cockpit in BUILDING THE TINY ACE time.

30 R/C MODEL BUILDER The ailerons on the Tiny Ace should both be set slightly up at the Jef pulled the Sportavia’s canopy o ff and mounted a 2-0z. tank in neutral position, makes for better rolls and inverted flight. the cockpit for really long flights. The Tiny Act kit is not as complete as that must go into each plane. Even with that it is more typical than poor in terms the Sportavia. You will need to find your this lack of perfection, the price is not of directions. Some of the translations own wheels, fuel tank, engine, and unreasonable. from the Japanese might seem funny (do control rods. It does come with a very I left off the rear landing skid, which is not fly over spectators or through effective solvent for welding the plastic a heavy piece of wire mounted in an buildings) . . . until I think how I would fuselage to the fin and stabilizer. Mount­ even heavier chunk of plywood, fast­ sound to a native of Japan trying to ing the engine is a bit of a trial. The Tiny ened in place with a large steel bolt. The translate this article into Japanese. A Ace i; made for a Cox TD or Medallion lane seemed as if it wascomingouttail- careful and thorough reading is advised engine. The clever bent metal engine eavy enough as it was. This turned out before you begin building, but this mount is just right in size and mounting to be a good idea, as the rear of the advice should be followed even with the hole location, but bolting the engine to airplane is quite strong enough for the best manuals. it isquitedifficult. I finally cut awaysome little time is spends on the ground, and INSTALLING THE RADIOS of the plastic cowling underneath the the model would have been tail-heavy The Sportavia, for a half-A job, looks engine so that I could get to the mount­ with the skid provided. like it could swallow Jonah and the ing bolts. The bolts and nuts come with A round Sullivan 1 oz. tank can just fit whale. There is plenty of room. I fit a 500 the kit. There is a cutaway in the cowling in the nose behind the firewall. The filler mah battery pack, a two-servo Cannon sides for the needle valve, but the tube projects through a hole in the block, and a third servo, with plenty of needle valve knob is nowhere near long fuselage top. Speaking of fuel tanks room to spare. These were the usual enough to be turned by human fingers. I brings up a small gripe: it is really hard to miniature servos, not the really small used a piece of fuel tubing to extend the get a properly operating clunk in a tank ones. The inside of the fuselage is built needle valve out to where it could be small enough for half-A planes. I'd like without formers or any other obstruc­ reached. With the Hiscott muffler at­ to see some manufacturer come up with a tions, and the holes for the control rods tached, the front end looks like a model solution this problem. And maybe Cox are aimed just right. Of course, Cox of a .60 pattern ship. It fits like it was can come up with something that will Sanwa servos slip right in, and a pre-cut made for the plane. allow us R/C enthusiasts to use their piece of foam is supplied for the receiver Some of my flying friends have men­ handy one-piece engine and tank com­ and battery pack. An antenna lead-out is tioned that the bent-metal engine mount binations in aerobatic ships. I haven’t provided. seems a bit on the filmsy side. I must been able to get any kind of clunk to The fuselage is quite light in weight, admit that it looks that way to me, too. operate in a Cox tank, and installing and if you close your eyes and heft it, But the plane doesn’t seem to vibrate regular tanks isn't my favorite way to you’d swear it was balsa. It even sounds unduly, and I have stopped worrying spend an evening. like balsa if you tap it. Q uite some about it. THE MANUALS engineering has gone into this plane, The ribs on the Tiny Ace are die-cut, Cox has done its usual excellent job although, as you will see, it could use a and they were not sanded before the with the manual. It is well illustrated, bit more. covering was applied, leaving ugly accurate, and complete. There are many The Tiny Ace is just the opposite. bumps along each rib. The fuselage is warnings about trying to learn from the There is very little room at all inside the built more neatly. I can’t complain too beginning by oneself. The Tiny Ace fuselage. I used the really small Litco much, considering the amount of labor manual is a different story. I would say Continued on page 78

Closeup of the engine installation in the Tiny Ace. The TD .049 is Jef replaced the Cox QRC in the Sportavia w ith a Medallion .049 fitted with the Hiscott muffler and throttle. R/C. Note the needle valve extension, a piece of fuel line.

AUGUST 1979 31 • None of the export Goshawks were fitted with the pivoting bomb rack. It was supposed to be secret, as was the carrier landing hook deleted by censors on so many photos of Navy carrier aircraft. Which raises a question : Did the Navy, wittingly or unwittingly, reveal the divebombing device to Ernst Udet? Twenty-eight F11C-2s were ordered by the Navy and 27 delivered, the last becoming the XF11C-3, a Goshawk with a retractable landing gear. Soon changes began to be made in the F11C-2. The low pressure tires were notable failures in the carrier landing test program and were replaced by 32 x 6 tires, the carrier arresting hook was moved aft, the 12- inch-chord anti-drag ring became 18 inches, the ailerons fabric covered; hardly a square foot of the airplane survived some change. The most visible change was in the aft turtledeck. The Completed after the XF11C-2, the XF11C-1 was powered by a 600 hp Wright twin-row that had F11C-2 began with the P-6E deck and a vibration problems. Given to the NACA in 1936, it was used for research. radio mast, the headrest was then in­ creased in size, changed to a half-round, and for a time was flat topped. The final version was a high-rise turtledeck, CURTISS GOSHAWK higher than the pilot’s head, and with a sliding half canopy. The reason for the many changes? Navy pilots complained BFC-2 continually of a cold draft on the back of the head and neck. by PETER WESTBURG PART TWO A major change was in designation. In its new role of bomber/fighter, the Navy decided that a more accurate desig­ nation would be BFC-2. In 1934, a year after its inception, the F11C-2 became BFC-2. Again adding to the confusion, several different squadron designators appeared on the airplanes. Only two squadrons ever flew the Goshawk, the famous High Hat group flying from the Saratoga, which had its number changed from VF-1 to VB-2 to VB-3. The only other squadron to fly the Goshawk was assigned to the Enterprise, on which it never landed nor took off. Modelers have a wide choice of markings and colors. Base color of fabric was aluminum dope, except for the familiar chrome yellow upper wing top surface. Metal parts were a very light gray. Tail colors were red for the Sara­ The XF11C-2 carried a 474-lb. bomb in a pivoting cradle designed to clear the prop in a 3 dive. toga, and "true blue" for the Enterprise Shock cords snapped the empty cradle back in place. Photo courtesy of Nat'l Archives. Goshawks. (Author’s Note: I have been reliably informed that "Curtiss Blue," available in hobby shops, is the same as "true blue.") A squadron of 18 planes was divided into 6 flights. Flight leaders had a band around the fuselage and a full-color anti-drag ring; 2nd airplane had no fuselage band and the' top of the anti­ drag was painted; 3rd airplane was the same except that the lower half of the anti-drag was painted. All airplanes in the squadron had a forward or aft- pointing chevron and aircraft number on the upper wing. The subject of the drawings is the leader of the 6th flight of VB-6; thus, it had the designator 6-B-16, lemon yellow fuselage band, anti-drag ring, chevron, and true blue tail sur­ faces. · In March, 1934, the F11C-2 was redesignated BFC-2. High-rise turtleback and sliding half-canopy finally cured pilot's complaints of cold draft on head and neck.

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This is a reprint of the plans for a 32-1/2" span Curtiss F11C-4 "Goshawk" by Miniature Aircraft Corp., which discontinued kit production in the late 1940's. Full size plans are available (See page 116), and include ribs and bulkheads printed directly off the original kit printwood. FULL SIZE PLANS AVAILABLE - SEE PAGE 116 AUGUST I979 35 Larry O 'Attilio sent in this photo of Weldon Smith's 1 /4-scale Aeronca Champ that was seen at a contest thrown by the Milwaukee Flying Electrons last year. Model was flown in non-military sport scale. Don't know if Weldon built it from scratch or a Bud Nosen kit. MAMMOTH By RON SHETTLER

• One of the questions most asked with rules. The answer here is simple. Quarter engines used in WW-I aircraft or the regard to the evolution of mammoth and larger scale models are largeenough compulsory "clearing” of engines used scale models is in which category (scale, for one to easily notice a missing pilot or in some WW-II aircraft on landing pattern, racing, sport flying, etc.) are crew if they were visible on the full-sized approach. they making their major contributions? counterpart. At this point in time, the 4) Visual byproducts. Did the full- The answer has to be scale or scale-like lack of a pilot is as acceptable as the sized counterpart trail smoke or vapor aircraft, but with the emphasis on flying. landing gear hanging down on a scale during high stress use? A lot of aircraft The next question, then, is a natural one. Spitfire doing aerobatics. did, but the trail of smoke on muffler Are large ignition engines too slow for But the pilot is only a small detail in equipped glow engines is totally out of scale flight of WW-II fighters? No way!! our illusion process. The following items place. But let’s prove that statement. In many are far more important. 5) Simulated landing maneuvers. past articles which I have read on scale, a 1) Duplication of aircraft speed in (Don’t simulate the bad ones!) Did the lot of opinions were given as to how this proper scale duringthe same maneuvers, originals do wheel landings or full-stall aircraft or that one, while looking like a flight attitudes, and altitudes. three-pointers as a general practice, or miniature duplicate in every detail on 2) Duplication of the same flight both equally well? the ground, did not carry that illusion maneuvers in the same style as the full- 6) Takeoffs and taxi maneuvers. Was it into the air, appearing either too fast or sized counterparts. normal for the full-sized aircraft to taxi too slow in flight. Actually, the word 3) Duplication of sound, where pos­ like today’s airliners, or did they fish tail "appearing” is the key here. sible, not only in tone but also amplitude in order to see past the cowl? Did they When you attempt to duplicate any­ and use of throttle during maneuvers, accelerate slowly on takeoff, roll, lift the particularly the "burping” or blipping of thing in m iniature, it has to be an Continued on page 70 illusion. The smaller the scale you use the more difficult the illusion is to TABLE I produce. This is why mammoth scale EXPERIMENTAL THRUST AND SOUND PRESSURE LFVEL VALUES aircraft have the advantage in the air by FOR THE 20x6 AND 20x10 PROPELLERS providing the thrill which no static 20x6 20x6 CAP 20x10 display can achieve. While on the ground, we have duplicated the scale RPM THRUST SPL THRUST SPL THRUST SPL rivets, worn paint, exhaust, and oil stains (lbs.) (db) (lbs.) (db) (lbs.) (db) to present the illusion of the real item in 2500 0.90 86.81 0.83 86.23 miniature, but we have done very little 3000 1.80 90.23 1.45 89.45 2.49 92.10 to carry out this illusion in the air. I 4000 4.85 96.96 3.46 96.29 5.19 99.02 would like to state that large aircraft 5000 6.92 101.23 5.88 99.84 8.31 102.86 models have done more to put model 6000 10.90 105.70 8.31 105.08 13.15 107.11 pilots and air crews into our creations 7000 15.06 112.55 12.80 110.98 18.69 114.56 than has anything before, including 8000 20.08 110.86 17.65 110.28

36 R/C MODEL BUILDER small contacts protruding somewhere are rarely seen. In that way you can simply connect an external battery and fire up. The connection at the plug can be accomplished in a variety of ways. The method I have been using successfully is to carefully attach a solder lug to a wheel collar and slide it over the post on the plug and tighten. You’ll need to experi­ ment with your plug to determine the proper hole size. In order to fit the Fox plug, I have found it necessary to drill out the collar. The ridges on the Fox plug allow a good solid fit that won’t slide and short out against the head or plug base. Wrap the battery in foam and seal in a plastic bag. Keep the wires as short as possible but leave some "vibration room.” Tuck it away as far forward in the nose as possible if you need the weight there. I use a fine wire secured through the slide switch to turn the system on and off. Bend a right-angle bend in the wire and arrange the switch so that pulling it out turns on. On one model I placed the fine wire in line with a panel line, and TO from a short distance, it was not visible. 1 One concern some people have is the amount of time you can get from a set­ up like this. In the case of the 4-amp By BOB UNDERWOOD battery, you can be quite confident that it is going to get through any average • The multicolored biplane rests lightly There is a concern with this method, contest without a charge, even for on the runway, seemingly oblivious of however. Make certain you tell your starting. One feature is that as the the hubbub around it. A transmitter is helper not to flip the prop. There could engine is running, the amount of cur­ poised nearby. A signal from the judges be one heck of a surprise involved rent draw is greatly reduced. In addition, and two figures stoop down. One flips should he absent-mindedly flip it I have found that I have rarely flooded the prop and the Kraft springs to life at through at the conclusion of a fight. an engine in an inverted condition, even idle on the first flip. The flight has begun. Another consideration is to provide during starting. This picture is nothing unusual per­ some external method for starting, A last thought is that you clearly mark haps, but several persons scratch their should your batteries go dead internally. the lead on the switch used to charge the heads and one fumbles with a watch to In the case of sport scale, a couple of Continued on page 70 start it. The scene was the ’78 Internats in England, and the model was a Hiper- bipe. Confusion resulted from the fact that the only equipment on the runway was the model and the transmitter. No starter or battery was present, since the model carried an internal starting battery. If you haven’t used an internal battery before, it is well worth the effort. Not only does it allow a more uncluttered starting scene, but it creates a better running engine both on idle and at the top end. There are commercial units available, however, may I suggest that you create your own system. Check with local radio and electrical supply houses and pur­ chase a D-size 4-amp cell. Those that I have are made by GE and have welded solder tabs attached. The weight is significant and comes out about 5-1/2 to 6 oz. Keep it forward and eliminate some of that lead you've been using in the nose. The wiring that is used is regular 16 gauge lamp cord, and a simple slide switch is placed in the circuit to turn on the system. I have used a mini-micro­ switch in conjunction with the radio switch, so that when you turn one on, you have both.

AUGUST 1979 37 • Texaco Time! As usual, this is the time of the year this columnist likes to talk about his favorite subject: the Texaco event. The reason this comes every year at this time is because of the 13th annual running of the SCAMPS Texaco and the 6th Annual R/C Texaco event as staged by the columnist and SAM 21. This year the Texaco events were blessed with the best weather this writer has seen at Taft for many years: 75-80 degree temperatures, 5 to 8 mph winds or less, clear skies, and an abundance of lift that was beyond belief. Even the early morning flying (the “ Dawn Patrol” ) was good, but thermals were not that much in evidence yet. You simply have to try this early morning event; it is the greatest! The writer will readily admit this column is primarily contest oriented, but as several fellows have indicated in their letters, this is okay as long as we don't forget what the name of the game is: FUN!! As we progress through this Marc Tackett with his Lanzo Record Breaker at the 13th Annual SCAMPS F/F Texaco, held in month's column, we'll try to talk about April. This is his third Lanzo and was brand new, but apparently Marc has the technique down the models used rather than how great a pat, as the model flew great right from the start. modeler is because of his winning times. Sunday dawned pretty early for some of us modelers, and as usual, Sal Taibi was the first on the field for the SCAMPS "Dawn Patrol” Texaco event. For those who are unaware of how this got started, we might explain. The SCAMPS used to run the Texaco event all day, but in the pm mPHOTOS m BY AUTHOR afternoon, some pretty powerful ther­ mals would come out. In many cases, the By JOHN POND actual winner of the meet wouldn’t be known until an hour after closing. This was brought about by the ruling that the timer was allowed to follow the model. Thirty-minute flights were common­ place, and many models were lost for good. About this time, Sal Taibi started a special event just for models that would fly well and not be too dependent on a lucky thermal. Sal’s reasoning was that flying early in the morning would pre­ vent long flights and even longer fly- aways. The wisdom of his event even­ tually caught on after several years and the Texaco event was moved up to the The grass on the Taft site was especially thick this year, but a thoughtful Taft resident brought a lawnmower and cut a swath big enough to take off from, saving the day for the F/F'ers. time of the Dawn Patrol. That's the way it has been ever since. Of course, after ten o'clock, when the Dawn Patrol is over, the competition is pretty well done, leaving very little flying for the rest of the day. It was at this time that the columnist organized the First Annual R/C Texaco event. Regardlessof the time of day, the wind and unfavor­ able weather, radio control models could be flown all day, generally con­ cluding at three in the afternoon. There was some slight friction be­ tween the free flight and R/C boys at first, but at this last meet, the division was less noticeable than ever. Most surprising to the writer (who also flies F/F Texaco) was the number of inter­ ested radio control fliers who came over to the F/F area to look, help time, and take pictures. Most of the R/C boys were enthralled by the free flight models. On A rare one! Kit McNorgan's English Cyclonic, powered by an Ohlsson 23. garnered a 2nd place the other hand, the F/F boys discovered at the SCAMPS Dawn Patrol Texaco contest with a flight of 21:49. A good, stable flier. that these guys aren’t a bad bunch after

38 R/C MODEL BUILDER Ross Thomas won the SAM 21 R/C Texaco at Taft with the fantas­ tic time of 1 hr., 40 min., and 46 sec.! Has anyone ever posted a Don Bekins took 3rd at the SAM 21 R/C Texaco with this scaled-up higher time in an R/C Texaco contest? (93") Gas Bird. Powered by an O.S. .60 4-cycle. 5) Jim Ogg (Powerhouse)...... 18:02 6) Bill Cohen (Dallaire)...... 17:18 7) Brad Levine (Powerhouse) ... 16:20 8) Bud McNorgan (Dallaire).... 15:26 9) Chris Christensen (Lackey Zenith)...... 14:50 10) Cliff Silva (Ehling)...... 14:40 In the Brown Jr. event, as we previous­ ly pointed out, total results were as follows: 1) Cliff Silva (Ehling)...... 51:20 2) Jim Adams (Ehling)...... 47:42 3) Sal Taibi (Scram)...... 43:09 4) Bill Cohen (Dallaire) ...... 40:28 5) Marc Tackett (Lanzo)...... 30:38

Over at the R/C side of the field, with this columnist presiding as Contest Thirty-three feet of wings! Nick Nichotau with his 10-ft. Yates Cabin, 15-ft. Boehle Giant, and 8-ft. PB-2. Nick did best with the Yates, placing 2nd w ith a flight of 39:35. Director (with help from the girls. Marge Bernhardt and Maxine Thomas), the all. They just didn’t feel like shagging a better take heed of R.B. McKenna, who competition was even fiercer until Ross free flight anymore! Very frankly, after won five years ago, retired the model, Thomas put his Shereshaw Eaglet (not the sensational times recorded in the then brought it out again and won! This, the Scientific version) up for the in­ R/C Texaco event, there may be a move against 22 entries! Results of the Texaco credible time of 1 hour, 40 minutes, and to also hold a Dawn Patrol event with the event looked something like this, in case 46 seconds. In order to win the Brown R/C ships. you are wondering which models seem Jr. offered for the total of two flights, To help replace the time left after to win most of the time: Ross promptly did 27:46 on his second 10:00 a.m.. Bud McNorgan, an irrepres­ 1) R.B. McKenna flight to prove it was no fluke. sible promoter, again staged his Brown (Super Buccaneer)...... 23:05 Thomas's model, the Shereshaw Eag­ Jr. Only contest. This meet is quite 2) Kit McNorgan (Cyclonic) . . . . 21:49 let, is a design made especially for the similar to a Texaco event, but all models 3) Sal Taibi (Anderson Pylon)... 21:00 short-lived Brown Jr. publication called are required to have a Brown Jr. engine 4) Cliff Silva (Roll)...... 18:31 Arpiem (RPM to you!). Featuring swept- for power. In addition, this is a three- flight-total type contest, so quite a bit of time could be spent flying all day. The top prize in this event was a Wahl Brown Jr., the same as issued in the R/C Texaco event. The latter, incidentally, was donated by Roy Turner of Oklahoma City, while McNorgan again promoted a Brown from Herb Wahl. In this event, it appeared that Jim Adams had it sewed up with two flights totaling 47:42. Cliff Silva put up a third flight for a total of 51:20. Needing less than four minutes to win, fate took an ironic twist and Jim was unable to start the engine in his trusty Ehling Contest Winner. The Contest Winner, originally designed by Frank Ehling, has proven to be such a good flier, especially with a Bunch Tiger, that it has won every year in one event or the other. Even Cliff Silva won the Dawn Patrol with the design this year! From Merrie Olde England comes this photo of Dave Baker with his Merco .60 powered M-G. For those who don’t believe Super Dave has been doing an outstanding job of promoting Old Timers in England... see text. Buccaneers are competitive, you had

AUGUST I979 39 Jack Alten made up these neat plaques for the SAM 21 All-Electric contest, held at Gilroy High School in central California. First 5 places were taken by Playboys! Bob Oslan tries to make off with the SCAMPS F/F Texaco perpetual trophy, won this year M elvin Yates design, the model ap­ flight time on the model and failed to by R.B. McKenna. peared in the 1937/38 Forster catalog, as make four minutes to get an official Mel was an avid user of Forster 99 flight. The model did come out a trifle back wings and a high elevator loca­ engines then. With today’s engines, heavy at 8-1/2 pounds, but still has an tion, the model appears to be uncanny Merco and O.S. .60 four-cycle types, the incredibly flat glide. in staying with a thermal. The version by model is a very good performer. The Another interesting sidelight of this Thomas has been scaled to 100 inches writer is hoping to see many more of meet was the engines employed. Worth and appears to be one of the best these built. noting was that the first four places performing Shereshaw designs to date. Outside of the remarkable flight were taken by models employing O.S. Bob Oslan flew a Scientific Commo­ posted by Ross Thomas, the rest of the .60 four-cycle motors. Bernhardt used a dore, also a Shereshaw design, for a very competition in the R/C Texaco event Super Cyclone which seems to get very respectable 28-minute flight. Oslan is was surprisingly close, as can be seen good economy. By and large, the four­ one of those fellows who does very neat from the following results: cycle engines dominated the first ten work and also flies well. Don’t you just 1) Ross Thomas (Eaglet)...... 100:46 places. hate that type! The only other Shereshaw 2) Nick Nicholau (Yates)...... 39:35 Field Pickups: Sal Taibi built his Scram model on the field was the writer’s 1937 3) Don Bekins (Gas Bird)...... 37:54 (a Ray Heit design) for the Beauty event, Champion, flown by John Drobshoff (his 4) Ted Kafer (PB-2)...... 34:12 but it has turned out to be such a good very first R/C contest) to a pleasing 15:20 5) Phil Bernhardt (Ehling)...... 30:05 performer that Sal is thinking of using it flight for 11th place. 6) Bob Oslan (Commodore). ... 28:36 strictly for duration competition. Inci­ The tough luck fellow on the field was 7) Karl Tulp (KG-2)...... 25:46 dentally, Sal sez the model checked out Nick Nicholau, who had to wait all the 8) Bob VonKonsky (KG-2)...... 23:13 in one flight! Many modelers now are time Ross Thomas was in the air. Even­ 9) Nick Nicholau (PB-2)...... 18:00 crossing lines to fly both free flight and tually, he did get to fly his Yates 10-foot 10) Karl Tulp (Dallaire)...... 16:49 radio control on the same day. That’s the Cabin model in the afternoon and came One of the newer models that made way it should be, it's all fun! Cliff Silva’s up with a very creditable 39:35 flight after an appearance was Rudy Calvo’s Gold­ 12-foot Baby Cyclone powered Roll opening with a 30:33 flight. berg Valkyrie, a beautifully silked model. Berryloid Winner continues to amaze For those who don’t know about this Unfortunately, Rudy doesn’t have much people with its slow and graceful flying.

Steve Roselle placed 6th at the All-Electric meet with this nice Flying Fifth place winner Don Anthony did a beautiful job of cowling the Quaker, a good flier with a geared Astro 25. Astro Flight motor in his Playboy.

40 R/C MODEL BUILDER From Nick Nicholau comes this photo of his Comet Curtiss Robin, built way back in 1938. Nick knew what the name of the game was then... note the billboard sign in the background. Plans for this model were featured in the July '78 issue of MB and are still available. Bill Cohen, in testing his Anderson valve, was actually a disc-driven rotary motor was running and the disc then Pylon, found the model turning back valve. As several engine collectors have turned counterclockwise and opened toward him and hitting his walker (Bill pointed out, this was actually an auto­ up a large slot (a la McCoy) to the intake still has problems with his broken hip). matic choke. By that, we mean the tube. Ironically, the damage was enough to following: When starting the engine, With such a large volume of gas now keep him out of the running that Sunday. the instructions said to revolve the being admitted to the crankcase, the Ross Thomas helped shag R.B. McKen­ propeller in a clockwise direction until a engine immediately went to a fast four­ na’s Buccaneer on the back of a motor­ small click was heard. What was taking cycle. The needle valve then required cycle. After a hair-raising 23 minutes, place was that the disc was being re­ more adjustment, with the engine com­ Ross decided he had better go back to volved backwards until only a small hole ing on stronger all the time. his transmitter. That's what makes horse opened to the intake tube. The With a 14x6 prop, the engine outper­ racing, a difference of opinion! columnist soon found that it was difficult formed comparable engines such as the MOTOR OF THE MONTH to flood the engine and as a conse­ Ohlsson and Super Cyclone. Not con­ Most modeler’s don’t know it, but the quence, made for easier starting, as per tent with the bench performance, the Barker engine, this month's subject, was their advertisement. writer then flew two identical Playboy actually produced before World War II Once the engine was running, the Seniors, one with a Super Cyclone and in four versions: the Model C, with engine was adjusted for maximum run­ the other with a Barker. This was the transparent fuel tank; Model 8, with ning condition; i.e., advancing spark most pleasant surprise of all. as the metal tank; and Model A, and the same lever and leaning out the fuel mixture. Barker version outclimbed the Super as the B, but set up for inverted running. The engine actually ran quite respecta­ Cyclone powered Playboy, which was The last of the pre-war engines was the bly with this set-up. Then, following the considered by most as no slouch in Barker Spitfire, which looked snappy instructions, the writer pushed the getting altitude. Alas, several contests with a cast metal tank, not unlike the button on the intake tube while the later, the Barker version disappeared Syncro Ace engine. After the Japanese had run up the white flag, with all the money that had pent up during the war, there was a terrific demand for motors, and right now! This had been brought on by the tremendous increase in controlline flying with consequent unheard-of prizes, like a full-size Piper aircraft for first place. All engine manufacturers were natu­ rally interested in cashing in on this sudden windfall, and the Barker En­ gineering Co. was no exception. One of the earliest advertisements of the new Barker engine appeared in the April 1946 issue of Model Airplane News. This advertisement billed the "Great new Barker sensational Man-U-Matic valve engine." Their claim of terrific speed w ith easy starting interested this columnist. So there was nothing else to do but invest $24.50 in a new Barker to see how it compared with the Ohlsson, Super Cyclone, and Orwick .60 engines. Upon inspecting the engine and reading the directions, a definite surprise was in store! The induction system, which the writer thought was a rear disc rotary

AUGUST 1979 41 Ed Rangus, of Waukegan, Illinois, did a beautiful job on this R/C 9-ft. "H erky," designed by Melvin Yates. The Herky is an excel­ A Buzzard Bombshell, being held by none other than its original lent flier and should prove to be a top contender in Texaco events. designer, Joe Konefes. Joe also designed the Comet Curtiss Robin Plans are available from John Pond. shown on the preceding page. and with it, the last of the available were correctly adjusted. The excellent using an Ohlsson type thrust bearing. Barker engines in the area, as the Barker fit between the cylinder and piston In conclusion, the Barker was just Co. was succumbing to the advent of the generally typified the workmanship of another good engine that failed to find glow plug. this engine. popularity with the modelers. Whether Barker engines had a real touch of For the technically minded, the bore it was lack of availability at all hobby stores, the higher price, or the newness class about them, as they featured a was .9375 inches with a stroke of .875 nameplate as is done in full-size aircraft inches, giving a displacement of .604 cu. of the engine, one or all factors pre­ engines. The magnesium castings were in. The overall weight was 11 ounces, vented it from competing with the quite well done, and coupled with a including tank. Two castings, both of established engine manufacturers. An­ shiny aluminum timer cover and a black magnesium, are used in this engine. The other good engine that has become an enameled head having deep fins and a steel cylinder and head was integral and engine collector’s jewel. cadmium plated exhaust, this engine blind bored like an Ohlsson .60. The SAM CHAMPS ANNOUNCEMENT was indeed attractive. piston was steel, with a tubular wrist pin Somehow or another, in compiling Barker timers were not the easiest to having aluminum wrist pin pads to the list of events to be run at the 1979 adjust, having 15 parts (Ohlsson has 11). prevent scoring the cylinder walls. A SAM Champs at Salt Lake City, the Despite this, very little intermittent ground, machined steel crankshaft was special Electric events were left out. This spark was encountered when the points fitted to a bronze bushed crankcase Continued on page 111 T lr Challenges

O LD T IM E R Model of the Month

Designed by: H. A. Thomas Drawn by: Al Patterson Text by: Phil Bernhardt • of his approach to model aircraft design. minimum of 23-1/2 ounces to be legal According to the original text, H.A. for modern Old Timer contests (‘‘mod­ • Most any modeler who has been designed the Challenger for his sister, ern Old Timer contests” .. . sounds like involved in Old Timers for any length of Mary Louise, who had just won a class B a contradiction in terms). Construction time has at least heard of H.A. Thomas, engine and needed a model for it. What is the last word in simplicity and should but go to any O.T. meet nowadays and else to do but to get big brother to draw give no problems. The only suggestion you probably won’t see even one of his up something? As it turned out, the we can make is in the interest of a much many designs. That’s because H.A.’s model was quite a performer, winning stronger wing, and that is to use the models, for the most part, were in­ 1st places in the first two contests time-honored plywood dihedral brace tended to be simple-to-build, steady, entered. in the center section, instead of that stable fliers, not all-out contest The Challenger spans 51 inches and dumb stick shown on the plan. machines. The Challenger, featured in has a wing area of 423 square inches, the May 1941 issue of Air Trails, is typical which means the model has to weigh a Continued on page 174

42 R/C MODEL BUILDER CHALLENGER FULL SIZE PLANS FULLAVAILABLE PLANS SIZE - 116 PAGE SEE

AUGUST 1979 & oo This month's Power Boating column deals with the Hustler M kll The center section framework ready for the application of sheeting, outrigger hydro from Mini-Marine Racing Equipment. The boat features extremely sturdy construction. R/C By JERRY D l LAP PHOTOS BY AUTHOR • After a one year engagement period, I up here in the state of Washington and questions, or other pictures that would decided to say “ Yes” to R/C Model I’m not going to be able to cover model be appropriate for this column. I would Builder’s invitation to join its staff of boating events all over this big old be more than willing to try answering Contributing Editors. I don’t know why I country of ours. No way. If you want to questions you might have on any aspect keep subjecting myself to this rather see your favorite event get some press of model power boating. I don’t know demanding task. For those of you who coverage in a national publication all the answers, but I have some friends don’t know of my background as a (RCMB of course), then you better take who are tremendous resource persons model boating reporter, I wrote my first the time while you’re at it. I’ll make a real in this hobby. I’ll be glad to respond to published model boating article back in effort to get your material into the issue questions by return mail. Please enclose 1966. I’ve tried kicking the model boat as early as possible. Remember, there is a stamped, self-addressed envelope for writing habit twice and each time I only a three month delay in getting some­ quick handling. I’d also be interested in stayed off the typewriter about three thing into print in most model maga­ knowing what you might want reviewed months. I guess that makes me a model zines, so don’t wait to get those results in the way of model boating products. boatoholic. However, I can only do so and photos in to me. The address is: Most of my past articles have been much when it comestobuilding, writing, Jerry Dunlap, 6702 Mt. Tacoma Dr. S.W., product review type pieces and they picture taking, and reporting. What I’m Tacoma, WA 98499. were boats that I personally wanted to now asking for is your input for the R/C Besides contest results and photos, build. Although they won't appear too Power Boating section of RCMB. I live we're always looking for opinions. often, I will be releasing some plans for

Sponson are assembled on a flat surface. Be certain to make a right A lead weight, map tacks, and clamps are used to hold the bottom and a left! sheeting in place.

The neighborhood squirrel checks out the construction of the The top sheeting being attached to the front and rear sponsons. sponson sides and aft sheeting of the center section.

44 R/C MODEL BUILDER The side sheeting being attached to the rear sponsons. Equipment installation. Jerry used two 4-oz. Sullivan tanks and a G&M radio box for the Kraft 2-channel rig.

The Hustler W ill runs nice and clean down the straights. Hardly Jerry's Hustler M kll leads two other .21 outriggers to the starting any of the boat is in the water. line of a heat race. new designs. I hope to hear from many return home on a Sunday evening. Now on to the feature topic of this of you so this column can begin to There has already been quite a bit of month’s article, the “ Hustler Mk II” reflect your concerns and contributions. print about the problems of the decreas­ from Mini-Marine Racing Equipment, And speaking of concerns, there are ing availability and increasing price of 542 North Yale, Villa Park, IL 60181. two big concerns for many of us in the the nitro we burn in our model engines. Although Mini-Marine Racing Equip­ hobby of modeling right now. Those If you didn’t see the articles in the June ment and its owner. Bill Pistello, are new two concerns are both in the area of what issues of Flying Models or Model Air­ to the model boating scene, the Hustler makes our engines, both auto and plane News, I’d recommend you go name goes back a few years to the .40 model, run. While this was written in back and read what Bob Hoeckle said in size outrigger offered by Al Churas. I mid-May, gas stations are closed on the FM editorial and what Don Typond weekends and nitro for model fuel is wrote in the boating section of MAN. I Continued on page 94 becoming even more scarce. Just what will be reporting on a very interesting effect the dwindling supplies of both of experiment that the Seattle Model Yacht these commodities will have on our Club will be trying in June. They are hobby remains to be seen. However, I holding a "non-nitro" race and I defi­ know many of my friends are becoming nitely plan to attend and race some of very concerned about attending out-of- my models. I will have some results for town contests where it is necessary to you in a couple of months.

What happens when 3 boats try to occupy the same space. John Moss's Gator .21, foreground, Our columnist with the 3rd place trophy he managed to finish race in spite of severe bow damage, K8iB .21 in Hustler M kll was snapped in won with the Hustler Mkll at the NAMBA half, Tom Brooks' Hughey Rigger was damaged when it ran over Jerry's stalled boat. District 8 Points Race held in his area.

AUGUST 1979 45 PHOTOS BY CHUCK BLACK

Chuck Black took this photo just after the start of a race in light air. Note the West Coast tradition, called " Walking to Windward."

length. Water is incompressible, so the real fluid acts like the ideal fluid we would specify for our analysis. For such a situation, there are two components which make up the drag: • SKIN FRICTION DRAG: due to the shearing of the fluid along the wetted surface of the body. • This month we continue designer Karl COMPONENTS OF RESISTANCE • FORM DRAG: caused by the displace­ Kirkman’s course on naval architecture For a clear description, it is helpful to ment and lateral movement of water, and hydrodynamics. The discussion break the total resistance into its compo­ eddy-making in the wake, and separa­ centers on the movement of bodies nents. Different resistances arise from tion of the flow on the after parts of the through fluids. While complex mathe­ different flow mechanisms. Consider body. matics has been eliminated from the first a body which is symmetrical about a When the shape of the body is not presentation, there is new vocabulary to centerline, parallel to the direction of symmetrical, a lift force may be gener­ be learned, and once learned it is motion (such as a keel bulb), and com­ ated and a third type of drag may be immediately put to use. An effort ex­ pletely bounded by a single non-com- generated: induced drag, or drag dueto pended on the reader’s part will be pressible fluid. The fluid must be non- lift. Further, when the body is brought amply rewarded by a new appreciation compressible in order that the energy near a free surface such as the air-water interface occupied by a boat hull, a of the dominant forces and considera­ required to move it aside be repre­ fourth drag is generated: wavemaking. tions in hull design. As one learns about sented by a physical motion. If the fluid comparing different sized hulls by using was compressible, its density would vary Each of these drag mechanisms be­ dimensionless coefficients, boats from and the body would have different haves according to certain physical laws. 36/600 to the International A classes buoyancy at different places along its An understanding of these laws is very become amenable to analysis. MODEL SAILING YACHT HYDRODYNAMICS: PART I, by Karl Kirkman A background in fundamental hydro­ dynamics is required if one is to under­ stand the basis for choosing among alternative hull forms. The following discussion is admittedly simplified and dwells on the general principles in­ volved. This was done to encourage the reader. A hull passing through the water is subject to forces. Of these, lift and drag are of the greatest interest in hull design. Lift is a force acting at right angles to the direction of motion, which helps pre­ vent the hull from making leeway when beating. Drag is a force in line with the motion and opposite in direction, which acts to slow the forward progress of the hull. Drag is the resistance of the hull tö Sailing is truly an international sport. These four boats belong to skippers from San Francisco motion through the fluid. and San Diego, California; Marblehead, Massachusetts; and Sydney, Australia!

46 R/C MODEL BUILDER Andy Littlejohn, Sr., gets himself ready to do his thing with his Ron Battershill attempting to lengthen the hull of his Epic in hopes LJ-50. Sure looks like a clean, relaxing sport. of increasing the hull speed. important when making initial design after its discoverer, Osborne Reynolds, We can compute skin friction drag on choices or when analyzing the per­ and relates the length of the plate to the a hull if we know its area, speed through formance of a particular hull. Let’s take velocity at which it is moving: the water, length, and have access toa C them one by one and inspect them more Rn = iV x L vs. Rn plot. Refined versions of this closely. If we measured the drag of many procedure would take into account the SKIN FRICTION plates of many sizes at many speeds, we density and the viscosity of the fluid. When a flat plate is pulled through the would find that they could be plotted as Since we use water, we can look for water, the water molecules nearest the in Figure 2. relative differences to guide our choice plate try to stick to the plate and are Now sure in the knowledge that any of better hull forms. dragged along. Those nearest the plate flat plate will fall on that curve, we can approach the speed of the plate. As one predict the drag (D) of any plate as Two distinct types of flow can exist moves out into the fluid, the speed follows: adjacent to a body’s surface. At very low drops off until a point is reached that is speeds near very smooth surfaces, undisturbed by the passing of the plate’s 1) Compute Rnby knowing the length the flow is hardly disturbed and little surface (see Fig. 1). The portion of the of the plate and choosing a value for the mixing occurs between adjacent layers fluid nearest to the plate is called the velocity it will be moving. of water. This is laminar flow. If the boundary layer. 2) Using Figure 2, move vertically speed increases or the fluid is disturbed Careful measurements have been upward to the curve, then left to the C or the surface is rougher, mixing can made which allow us to determine the scale, reading off C l occur between adjacent layers of the amount of energy required per square 3) Using Equation 1, we know all fluid. Little parcels of higher velocity foot of hull surface to drag the boundary except the drag (D). Rearrange the fluid are mixed outward into the slower layer along. This is called "specific equation and grind out the answer: water farther from the hull surface. This resistance,” since it refers to a given area D = C X AV2 flow is called turbulent. The change at a given speed. If we change the area or move the plate at a different velocity, we will obtain a different number for the drag, due to skin friction. To allow comparison between different sized lates moving at different speeds, the ydrodynamicists have found the drag coefficient to be useful. One measures the drag, then divides by both area and the square of the velocity. As an equa­ tion, it appears as: C = D/AV2 where: C= non-dimensional drag coefficient D = drag A = area V2 = velocity squared Further investigation showed that further benefits resulted if a parameter called the Reynolds number was used. The Reynolds number (Rn) is named

AUGUST I979 47 from laminar to turbulent is termed transitional flow. A composite plot of many data points for C (skin friction drag coefficient) versus Reynolds number is given in Figure 3. Notice that the transition flow happens over a range of Reynolds numbers. Also, we see that laminar flow occurs at low Reynolds numbers, while turbulent flow is more likely at higher Reynolds numbers. FORM RESISTANCE Form drag results from the thickness of a body and the requirement for the water to move out of the way as the body passes. Part of this drag is caused by the development of a “ super velocity,” the rush of the adjacent fluid parcels to travel the distance out and around the body. Since the fluid is incompressible, a pressure difference is caused by the arrival of the body. Both of these pro­ cesses require a continual input of energy, and since this energy is ex­ tracted from that given to the hull by the sails, it appears as drag, or a loss in propulsive force. The amount of form drag from a given body is affected by the Reynolds number of the flow. In Figure 4, the drag coefficient for streamlined foils (like a fin of a fin keel) is plotted against Reynolds number. The scales are somewhat different, but the plots for flat plates are identified. Common in the diagram is a drop in the drag coefficient between a Reynolds number of 105 and 106. A very similar plot can be made for other streamlined bodies, such as keel bulbs. It shows the same general shape, including the drop in drag coefficient at the lOMO6 Reynolds number area. INDUCED DRAG When a foil, bulb, or hull is placed at an angle to the flow, another drag appears. A typical sailboat actually crabs sideways while it is going to windward. By so doing, the fin and hull create a lift force which counteracts the sideways push of the sails. This allows the boat to make progress to weather, rather than being simply blown to leeward. The price we pay for this assistance is in­ duced drag, or drag due to lift. All the foregoing applies directly to deeply submerged bodies, and all can affect the performance of partially sub­ merged bodies. * * * Next month we will consider the problems associated with the hull and how wavemaking resistance and wake formation become a part of the de­ signer's arsenal. I would appreciate comments from you readers as to the appropriateness of the material being presented. Is it helpful? Is it too tech­ nical? If you’ll give me your reactions. I’ll be better able to provide the kinds of columns that meet your needs. I’ll field questions at 7608 Gresham St., Springfield, VA 22151, if you’ll provide a stamped, self-addressed envelope. ·

1 48 R/C MODEL BUILDER ^REEiUGHř CURTISS "GOSHAWK O.T...... 35 FREE FLIGHT SCALE ...... 50 HANGAR R A T ...... 53 AND CONTROL L IN E ...... 56 HANNAN'S HANGAR ...... 58 PEANUT MONOCOUPE 1 1 0 ...... 59 A .I.R .-X X ...... 62 ^Qa/t r o l UN£ FREE F L IG H T ...... 64

Jack McCracken's Waco Taperwing, built from Pete Westburg's scale drawings . More info in "Free Flight Scale" column.

• ' 4 V ' - N ·■ • s *

*v.\ w * - Λ A magnificent Waco Taperwing, built by master modeler Jack McCracken from Westburg A disgusted Bill Warner does a dance on his drawings. Has pendulum ailerons, working oleo struts. Dart powered, flies as well as it looks. Caudron after the motor broke while winding. The Floh flew in one very large circle, FREE FLIGHT SCALE looking as though it was going to leave the entire flying site. But when the By FERNANDO RAMOS power quit, it came back toward the launching site and made a perfect PHOTOS BY AUTHOR landing on the tarmac . . . not far from where it took off. Everyone gave Joe a • The Flightmasters held its first Flying only pleased but surprised. Several had standing ovation. During the whole Aces type contest ever. There were a an extra 50 points before they ever had flight, the model was as steady as a rock. couple of unexpected elements which to fly their model, because of the Another interesting but odd design really affected the outcome of the particular design they had chosen. The was Jim McMahon's Pterodactyl. This contest. The first and major one was the basic concept of the F.A.C. rules is to model was electric powered, and it lack of available gas, and the other was promote the building and flying of the showed real promise in the way it flies, the weather. It is infrequent that we more unconventional aircraft types. but the wind was too much to try any have poor flying weather, but this time There are airplanes flying today that more than a few test hops over tall the gods saw fit to bless us with a great would have never been considered as weeds. The fuselage was entirely vac­ deal of wind. In spite of these two flyable just a few years ago. uum formed with quite a bit of panel crummy factors, there was a tremendous There were many interesting designs detailing. I’ll have more on this type of number of contestants and models, that showed up, and one in particular construction at a later date. along with numerous spectators. Offi­ was Joe Tchirgi’s WW-I Floh (German for Tom Laurie had a unique Douglas cially, 72 airplanes were entered, but “ flea” ). This crazy-looking bipe is about Mixmaster XB-42. He took off the land­ there were many more which weren’t, as odd as you can get. No one watching ing gear, since R.O.G.’ing is strictly an due to the wind. expected the darn thing to fly. It was option for an extra 5 points with the The members of the Flightmasters, powered by a Cox .049. Joe, who is one F.A.C. rules. However, he had to fly over long noted for their accurately scaled very ingenious individual, tied a length the weeds since the dual pusher props flying models, held this type of contest of 2 lb. test monofilament fishing line to are quite vulnerable. What really makes in order to bring out the sport fliers. I the tailskid of the model. He R.O.G.'d this set-up unusual is that the props are believe that this was accomplished. the model, feeding the line just right so contrarotating and freewheeling, using When some of the fliers saw the number that the model would not nose over two separate rubber motors. One motor of points available to them by the during the takeoff. Once airborne, the is wound in one direction, and the other handicapped method, they were not invisible line trailed behind the model. wound in the opposite of the first. When

Tom Laurie holds the props on his Douglas Mixmaster while George Tom's Mixmaster is a very stable flier. Uses two rubber motors, James winds. An excellent type of model for the F.A.C. rules. geared props produce a unique engine sound in flight.

50 R/C MODEL BUILDER Dave Smith came from Arizona to fly his neat C O j powered Fokker D-VIII. Not unusual enough for F.A.C. rules, however.

Dick Siegfried tweaks wing of his rubber ship before fling in the WW-II mass launch event.

Mick Mikkebon waits for a gust to pass while winding his Laird biplane. Chuck Conover holds. Gusty winds and the shortage of gasoline held down the total number of entries. Tom launches his Douglas, he needs the There was so much going on that I was help of someone to hold the two props. unable to see it all or to photograph half The props are released and Tom of the models there. In fact, I brought six launches the all-sheet model for a of my own models and only had a spectacular flight. The meshing of the chance to fly two of them! The combina­ gears gives this model a real interesting tion of talking, photographing, and the engine effect while flying. windy weather prevented me from During the course of the meet, the flying. Just as well, as there seemed to be mass launch events were held at 10,11, a dark cloud following me all day. 12 p.m. They included WW-I, WW-II, In spite of all this, we had a full day of and Thompson Trophy respectively. flying and camaraderie. Who can ask for These events are enjoyed by both par­ more than that? There is no question ticipants and spectators alike. It is truly that we will be having more F.A.C. type Mick Mikkelson, Bill Noonan, and Dick Sieg­ fantastic to see six to eight models of the flying in the future. After all of the flying fried get a good launch in WW-I event. same class reach for the skies! was over, a new and novel approach to

Yipes! Joe Tchirgi's WW-I German "F lo h " (Flea) looks like something that Walt Disney might have designed. The model astounded everyone (probably Joe, too!) by proving to be a very stable flying machine. Power is a Cox Medallion .049.

AUGUST 1979 Bob Haight of Las Vegas launches his good­ flying COypowered Pfalz DR-1. trophies were awarded. They were a do- it-yourself-trophy kit. Neatly packaged were all of the materials necessary, including engraved plates, to make a genuine Flying Aces Trophy. We figured that anyone objecting to this interesting approach doesn’t belong flying in this type of contest! Here are a few hints I came across while preparing for thecontest. I needed to paint part of one of my models silver. Silver is probably one of the most difficult colors to achieve on a rubber Fernando's little ABC Robin is so homely looking, it's cute! Power is a D.C. Dart .035 diesel. model . .. without weighing it down, Model is not really suited to the F.A.C. rules, starts out with -5 points. that is. Normally, I’ll use Floquil’s bright silver or platinum mixed with nitrate spraying and drying, you can polish it to dope. This has always worked out well, whatever degree of shine you want. The especially on gas models, where more results are quite amazing. However, the pigment can be used. There is a fairly non-buffing variety is the one you want new product out (I believe out only 2 or to use for tissue-covered models. The 3 years) called Spray-and-Plate. This material has the viscosity of water and material is used frequently by the plastic should be applied using an airbrush fraternity to give plastic a metal look. It only. When this material is sprayed on it comes in two different forms. One is seems to cover in one fell swoop. You simply called buffing, and the other non-buffing. With the former, after Continued on page 102

V

NV. Howard poses with his Chambermaid. Typical action during the start of the Thompson Trophy mass-launch event. These are by far Looks bigger than most Thompson models. the most popular events with the spectators.

Before and after the start of the WW-II mass launch. Dick Siegfried (foreground) and the young fellow in the background get a good, even launch, but the flier in the middle hasn't released his model yet. We don't know what Dick's model is, but the other two are Heinkel 100's.

52 R/C MODEL BUILDER RAT

By H A R R Y B A R R ... A cute Once both panels are framed up, remove a small sliver of tissue from the little rubber job that is easy to gently sand the leading edge to a stabilizer center rib in order to get a build and fly. Full-size plans on rounded contour and reglue all joints. good bond between the fin and stabi­ next two pages. Do not join the wing panels at this time! lizer. Add the trim tab at this time, with Set them aside for now. about 3/8 inch right offset. Tack-glue • "Hangar Rat” owes its existence to the The tail surfaces and cabane structure lightly to allow for adjustment. Cut "M r. "Sig Parasol," a simple, easy-to-fly, are built flat over the drawings using the Rat” from foam of balsa, decorate, and tissue-covered profile model. Having time-honored method of pinning and glue in place. built one of these with a cambered wing, gluing. The only point worth noting I used a 7-inch plastic prop, and the I proceeded to fly it every lunch hour in here is the method of joining the stabi­ prop hanger was the one supplied with the hangar, where I worked, until it was lizer leading edges. This is stronger than the Sig Parasol. This simply slides onto so tattered it was retired to a place of a butt joint. The 1/32 trim tab is cut out the stick. If you wish, a metal strap or honor above my bench. Needing an­ now, sanded, and set aside. Do not glue aluminum tube type can be used in­ other fun machine that could be built in to the fin at this time. Lightly sand stead, as long as it’s securely bound and a hurry, "Hangar Rat” evolved, using the surfaces and check all glue joints. glued. Make sure that 3° to 4° of down- same airfoil I had used on the Parasol. The motor stick is a firm piece of thrust is built into the hanger, no matter It has been a success right from the 1/8 X 3/8 balsa. Pick a good straight what type you use. Use a drop of rubber first flight, with average flight times piece and after cutting to length, taper lube on the prop shaft. under a 20-foot ceiling of 50 sec., with a the bottom (from front to rear) to At this point, pin the cabane to the best flight to date of 1:08 and many 1/4 X 1/8. Sand to suit your personal fuselage and by trial and error move it flights over a minute. It is easy to adjust tastes. fore or aft until the “ Rat” balance at the and build and will bring pleasure to both The wire parts are bent up from .025 point shown. Because of the large the beginner and the jaded R/C nut (like music wire. Note that the tail skid and stabilizer, the CC is further aft than me). It brings back memories of simpler rear hook have a tang that pierces the might be expected. Once balanced, times when modeling was less complex motor stick approximately 1/8 of an mark the correct position of the cabane and expensive. inch. Bind the hook and skid neatly with and glue it in place. Ensure that the wing If you are a beginner, follow the plans cotton thread and cement securely. The is properly levelled and the incidence closely and you will be rewarded with a landing gear is pressed over the motor angle is correct. Adjust to suit. You can fun flying machine. If you’rean old hand stick in the proper position and it is also now add the 1/16 x 1/8 lift struts. The at the game you probably have your own bound and glued in place. Slip a pair of small “ X” on the wing drawing gives its ideas about a lighter airframe, better 1-inch wheels in place over the axles and location on the wing, and the side view prop, etc. Regardless, have fun! bend the axles upward to retain the of the fuselage indicates the struts’ CONSTRUCTION wheels. position. Although the struts' forward Let’s start with the wing and get that The wings and tail surfaces should position is unorthodox, I placed it there miserable so-and-so out of the way. now be covered. Use the lightest pos­ for a reason. If the "Rat” contacts an Using the side view of the fuselage, sible grade of tissue available, iron it flat, obstruction, the strut takes the brunt of cut a template from 1/32 plywood of the and attach with water-thinned white the collision and protects the leading rib profile. Reinforce the edges of this glue. Cover only the top of the wings edge of the wing. It’s much easier to template with a Cyanoacrylate type glue and stabilizer and one side of the fin. Do repair the strut than the wing. to toughen them against knife knicks. not use any dope and do not shrink the If desired, initial glides can be done Using this template, slice out ten ribs tissue. with the rubber motor left off. It has very 3/32 deep from 1/20 sheet and two full- Now that the wings are covered, little if any effect on the CG. Adjust the depth ribs from 1/16 sheet. Protect your cement both butt ribs lightly and join, glide for a flat right turn of about 20 feet drawings with Saran Wrap or something using clothespins as clamps until the in diameter. My "Rat” flies best on a 17- similar and pin the wing frame to your glue dries. At this point, glue the cabane inch single loop of flat 1/8-inch rubber. building board. Use the dihedral jig to to the wing in its correct position. Ensure This is for the aforementioned 20-foot set the root rib angle accurately and glue that it is perpendicular when the wing is ceiling. No doubt you’ll want to experi­ the root rib (the full-depth rib) in place. level (equal dihedral under each tip). If ment to find the best prop/rubber Add the gussets at the root and allow to such is not the case, apply your sanding com bination for your own site. The dry thoroughly. Since the wing is bi­ block to the surfaces that contact the wheels can be bent forward or back for laterally symmetrical, the same wing wing ribs until corrected. (Note: the final trim adjustments. drawing can be used to build the second cabane glues to the side of the root rib.) So now you can pack in the winds and panel merely by moving the root rib to Accurately assemble the tail group to have at 'er. I hope you enjoy the “ Han­ the opposite end. the fuselage. It may be necessary to gar Rat" . . . I still do! ·

AUGUST 1979 53 R/C MODEL BUILDER AUGUST 1979 55 Norm McFadden holds while Howard Rush checks his watch. Rush Moose Allen purposely tangles the lines on Phil Cartier's plane. Phil measures fast starts in minutes, not seconds. Charlie Johnson pic. is behind Moose, we don't know who's holding the plane, sorry.

PHOTOS BY CHARLIE JOHNSON

ontrol line By DIRTY DAN” RUTHERFORD

• As a C/L modeler, you are constantly there are still a lot of you out there who the damage will be there, but at least a building these funny looking wooden have yet to experience the th rill of chip won’t fall off, leaving primer staring things that have wings and such pro­ breathing epoxy-contaminated air. you in the face. Another advantage is truding at (sometimes) odd angles. For these, it is your choice as to which that it will keep for awhile, even if left at When all of the wood pieces are in of the many epoxy paints to use. When I room temperature. Just recently a good place, it is a generally accepted fact that think of epoxy paint, K&B Superpoxy is friend (Bill Brazzle) related how it is you need to then cover up your handi­ the first to come to mind, as I have used possible to mix Aero Poxy, apply it to the work with something. This something this product on many models. Hobby- model, and then store the leftover paint seems to serve a purpose in that it poxy is also a good standby, in fact I in a capped jar. It need not be stored in supports paint rather well and many think they were the first with epoxy the freezer like other epoxies. What claim that it helps the flying surfaces paint for the modeling industry. happens (according to Bill) is that the produce lift. But there is another relatively new color and the catalyst separate after Although many use plastic films for epoxy paint available from Pactra. It is sitting for a bit. With the two not mixed, covering and the rest seem to stick with called "Aero Poxy” and seems to offer a no chemical reaction can occur, so the tissue and dope, more and more couple of advantages over the other paint stays liquid. Naturally, there is modelers are trying the epoxy-based paints. First thing is that it seems to be paints. Not a new thing, to be sure, but less prone to chip. Ding the model and

Rich Lopez took this photo of his most un­ usual living room. Note "O p-A rt" on walls.

R/C MODEL BUILDER Bob Carver launches an all-wood Rotation Station built by Gene Pape. Smoke is from a rich needle setting on ground, but at this stage the engine is almost peaked out. California Flash pic. some chemical action at the interface of state before gluing them in place. These then sanded with a sanding block, you the color and catalyst, but still the stuff pieces would be cheek cowls, elevator/ will end up with few, if any, low spots. If will stay workable for about six weeks. stab assemblies, and so on. On a Good­ you screwed up, the big holes can be At any time in the six week storage year I once completely glassed and filled in with Hoppypoxy PFC, probably period you just remix the paint and go resined the wing as well as tail surfaces the best product for this purpose; in to it. Might want to check to be sure the and cowl before gluing them in place. fact, it can be used on small spots, but paint is still as thin as you like it, as the Of course, the fuse had also been usually is not necessary. Any places thinners may be lost to a certain extent. through the glass and resin business where the resin has been sanded Any of the epoxies will produce a before receiving the extra stuff. through should get another coat of resin good to excellent finish, depending With a ready-to-paint model in front and more sanding. upon how picky you are about sanding of you, prepare yourself for the fact that With the model once again sanded to the devil out of thestructure. Actually,it it really is not ready to paint. Unless you your satisfaction (still using that good goes deeper than that. The model has to have a bench covered with foam (some old sanding block), it is again time to be built carefully from the first to last do, believe it or not) upon which to rest hold the model up to the light and look. step, if you want to end up with a good the model while working on it, you have Right about now you will probably have finish that will last. Those little cracks managed to put a bunch of dents in it. to make a decision. You can mark the you see in the paint of a model are Until you get some color on the model, “ holidays” and go back to filling and caused by stressed structure that is plus doing some block-sanding, these sanding, or you cansomehow rationalize probably being stressed too much . . . or dings are really hard to spot. But if you not wanting to have that good a paint that has failed. Dig down into a crack in want a light finish, you will have to find job anyway... the paint and you can probably find them without resorting to too much One way or the other you will finally cracked structure underneath. A simple color sanding. get down to applying some color, but coat of paint cannot be expected to hold The best way seems to be to set up a not yet. First you need to put on a coat of the whole plane together. strong light. It can be a reading lamp; I primer. There are several primers So it really is important to get things usually use a naked 200 to 300 watt bulb around, and one that I know works well lined up before gluing. To use the in an overhead socket. Hold the model is Hobbypoxy’s "Undercoat White." proper glue for each joint. To be sure up to this strong light and look. I mean However, I generally use K&B primer, each glue joint is tight fitting . . . but not really look. If you have used resin over which has its own primer catalyst. This too tight. Any parts that butt up to or glass and wood and did the sanding with stuff has a lot of solids in it, is pretty easy intersect with other parts and are shaped a block like you should, the low spots to sand, and has a light gray color to it. should be completely sanded, ready to will be shiny. The high spots all got hit The main reason for using it is that the finish, before being glued to the model. with the sanding block, so will appear K&B primer easily covers in one coat, The ply doublers on profile models flat in finish. These low spots need to be and with all of the solids, does a good job come to mind here; if you want the filled in, or if you used too much resin in of filling in pinholes and even small ends of them to blend into the fuselage the first place (a common mistake), it is nicks. smoothly, then sand the doublers to sometimes possible to just keep on With the primer on in a fairly even shape before they become an (almost) sanding until the surfaces are complete­ coat, it is once again time to block sand. permanent part of the model. Trying to ly devoid of shiny spots. Sanding through Carefully watch the pattern produced sand the ply while avoiding digging up the resin to the glass cloth or wood when sanding. The block is flat, so if the the adjacent balsa is almost impossible. structure is also a common mistake, so primer comes off unevenly your paint base is also uneven. I generally keep on In order to get a super finish I have don’t overdo it. sanding the first coat of primer until it is occasionally taken separate pieces of the If you started out with a straight model straight to the "ready to prime” structure, did the resin bit properly and Continued on page 89

AUGUST 1979 57 I

"Whether the noise or the power is the greatest source of attraction is still an unanswered question." • The above quote, from an engine Howard Hughes’ monster flying boat, article in the September 1946 The Model New British Humbrol C O j motor features an generally known as the "Spruce Goose.” integrally mounted fuel tank and filler nozzle, Craftsman, might well be asked of some However, Frank T. Courtney, who was eliminates delicate copper tubing. Photo sent model builders, motorcycle enthusiasts, once involved in the project, reports in by Ron Moulton. and owners of power lawnmowers! The that among his associates the craft was article was supplied to us by Sears called “ termite castle” ! examples, and of course, the Kremer McCorrison, who also included a price Prize triumph of the Gossamer Condor. ACADEMY AWARD FOR MPA FLICK list for supplies from the Airplane Model COMING ATTRACTIONS League of America (AMLA). Apparently We were surprised and pleased to see an Oscar presented for the “ Flight of the From "The Hangar Pilot," edited by dating from the 1930's, it makes fas­ Dr. John Martin, a tongue-in-cheek cinating reading in these times of ram­ Gossamer Condor" film. Another film now reappearing on television, called announcement of a vitally interesting pant inflation. For example, plans were article for gum-band fliers: “ Safe Stor­ available for an “ Indoor Pusher,” an "Icarus’ Children," is also a winner in our book. It traces the history of man- age For Your Good Pirelli.” The author? “ Outdoor Twin Pusher,” "Hydroplane,” Brinks. “ High Climb R.O.G.,” Fokker F10-A, powered aircraft, including many of the Boeing P-12B, and others, for the mini­ early "freaks,” the partially successful Continued on page 86 scule sum of only two cents each! As if that isn't demoralizing enough, a “ 3-30 Darmstadt Glider” kit was offered for one buck, and a copy of the official AMLA manual was yours for the re­ sounding sum of one nickel. Ah, well. Some wag was saying the other day that dollar-a-gallon gasoline prices didn’t phase him . . . after all, he'd been paying eleven dollars per gallon for glow fuel! Dr. Dzus reminds us, however, that our hobby, at any price, is a real bargain compared to psychiatrist’s fees. WOODEN WONDER As of this writing, there seem to be no Beautiful R/C scale model of Maude Tait's Gee Bee "Y " , built by Henry Haffke. Note function­ fresh rumors concerning the fate of ing cockpit door and "Filaloola" bird emblem on the side.

Fuselage formers for Bill Noonan's latest model were developed Lubomír Koutný, of Czechoslovakia produced this fine "action using a carved foam half-model. Details in text. shot" of his l/20-scale Fokker D-VII and Martinsyde Buzzard.

58 R/C MODEL BUILDER

George James showed up with this really neat Red Zephyr, complete Mike Mulligan's "Cloud Chaser," published in MB, put in a 2:31 with motor hum device. Best part is the dummy Ohlsson .60! flight for high time of the day. Two of these models flew in meet. rules are set up as a starting place, with metamorphose, with one twist being the spirit of the event as a guide to tried using the model’s weight in grams modelers who come out to have fun. A as a score multiplier to take away some 4-gram minimum weight and a 10-point of the incentive to build super light. The bonus for authentic coloring and mark­ event has already been flown outdoors ings won't dissuade anyone who really as well as indoors, but the middle of the can’t understand what the event is not initial fits so nicely in AIR that it would for. One can but hope that a spirit of be a shame to change it! “ Lacey-Faire” will not encourage people Nineteen models showed up at the to Fike it up. first AIR-XX meet at Paul Revere Jr. High An AIR-XX must be rubber powered in Brentwood at the Flightmasters West's and have the original model outlines, monthly second-Sunday indoor meet, though a modeler may use his or her only a month after Ken announced the own modeling techniques. At present, rules. From George James’ “ Red Zephyr” two classes exist: Cabin, such as the (the original model by Scientific adver­ Sparky or Victory, and Stick, from the tised in the 30’s having made a 25-mile Gollywock on down the line. One flight) having a dummy Ohlsson .60 and immediately thinks of a variety of other a motor-hum device to Bill Warner’s classes (Scale, Wakefield replicas, gas 1936 Ed Lidgard ornithopter, there was a jobs, etc.), should the competition get wide range of models, to say the least. Ken Johnson's Sparky won the Cabin event too hot in these categories. Although Ken Johnson's 1:55 winner. with a flight of 1:55. Already the event is beginning to Continued on page 86

Mik Mikkelson managed a 1:42 flight with his Gollywock, good for Mik Mikkelson poses with his 20-inch Gollywock. The photographer 3rd place. Lightly built wings bowed up in flight. didn't say, but it looks like it's covered with condenser paper.

Bill Warner's Ed Lidgard ornithopter stretches the rules by having The historic Penaud "Planophore," built by Bill Hannan and proxy- to be measured 20" with wings in the "u p " position. flown by Curt Mooney to a very creditable 56 seconds.

AUGUST I979 63 Walt Prey is well known for his tissue trim jobs on free flights, and Walt also did a masterful job on this "Big Eagle." Walt is prime mov­ his Bean Bogan is no exception. Model held by his son, Ralph. er behind Nostalgia event described in April '79 F/F column.

By BOB STALICK

PHOTOS BY AUTHOR • I’d like to start things out this month chase! to recap these developments and pre­ with a piece I discovered in the Fresno "You ride past green fields where sent the system I am using today. Model News, by Corky Mullen, just cattle are grazing peacefully as they Any circle tow system, regardless of about the time the weather began enjoy the fresh young grass. Now you hardware, must allow for these func­ making its annual springtime improve­ pass orchards of pink and white blos­ tions: ment. I just couldn’t think of a more soms. Then you spot your plane where it a) Ability to allow the model to circle appropriate way to express the true free landed and sits there waiting for you to on tow. flighter’s feelings after a long winter’s retrieve it. Walking back to your motor­ b) A latch to allow the model to stay layoff: cycle, a cow moos in the distance. The on the line until the desired release "Take a dab of glue, some balsa, or sweet clear song of a bird comes from time. Hot Stuff. The month of May, add an where he is perching on a fence post. It c) Variable glide and circle tow posi­ engine and a set of plans. Mix a little is then you are sure you will be a free tions, so the model will circle more labor and you have a free flight plane. flighter all your life.” tightly on circle tow than in the glide. "Yes, you have that and a lot more. Now even john Worth can under­ d) Zoom launch into glide turn at You have that special feeling in the air. stand why we haven’t all “ graduated” to release. Excitement, anticipation, or whatever. R/C yet! The twanger tow system allows all of The scent of blossoms float on gentle PLUNK YOUR MAGIC TWANGER! these functions to be performed, and breezes. You arrive early at the field to AN UPDATE does it with a simpler and lighter mecha­ greet other fliers and have some pleasant I usually answer questions about the nism that is easily constructed and used conversation. Little problems at the back twanger towhook system I use on my by the average flier. In addition, it allows of your mind are suddenly gone. Nordics with a reference to Bob Stalick’s you to release the model quickly in an “ You start your engine! You light the December 1975 column, which pre­ emergency situation, unlike the mecha­ fuse and set the timer. The plane leaves sented a nice drawing and description. I nically-latched (Russian type) hooks your hand, climbs and circles, and then have been refining and changing small which require a complete cycle to you thrill to the silence as it glides slowly, details from these drawings since their restore line tension and release. For the beautiful to watch! Then begins the initial appearance, so this month I’d like average flier who wishes to circle tow his

Swinging arm of ths twanger towhook is made from an R/C nose- OFF position by a piece of thick monofilament. Plunger line end is gear steering arm. Ring for twanger hook is crimped into bottom wire hook, held in place by monofilament also. All lines are nylon- hole. Line runs through fuselage to rudder horn. coated cable.

64 R/C MODEL BUILDER gliders, the twanger system is the quickest and surest way to success. The first function, circling on tow, is provided by the swinging arm mounted in the fuselage. A line is attached to the arm and to the rudder arm, so that the rudder is fully forward (straight tow setting) when there is tension on the line. When tension on towline is slacked off, the arm moves back and permits the rudder to deflect to the circle tow setting. The arm can be made of any con­ venient material. I’ve used 1/16-inch thick brass sheet, but there's no reason 1/8-inch aluminum or even plywood (suitably bushed with brass tubes) wouldn’t work. If you don’t want to cut out an arm,checkyourlocal hobbyshop for a 5/32-inch nose gear steering arm (Sig, DuBro, and Goldberg make them). It’s made of nylon and even has the holes already drilled. The only arm dimension remotely critical is the dis­ AUGUST MYSTERY MODEL tance between the pivot hole and the rudder line attachment. It should be at tow. The plunger I use is a 2-56 threaded least 1-1/4 inches, to give good move­ rod, with a hole drilled at one end for ment at the rudder without an exces­ the actuation line. The best commercial sively short control horn. Use a piece of item for this is a DuBro Rigging Coupler 3/32 I.D. brass tube for a pivot. Attach (part No. RC 30). Regular Threaded this to the arm with Hot Stuff, solder, or Couplers may be used, but the line must epoxy, so it pivots with the arm. Make be attached by mashing or soldering it the tubing slightly shorter than the into the end of coupler. You might also inside width of fuselage. Mount the arm try drilling a hole in the end of a 2-56 in the fuselage with a 2-56 bolt running stud. Next, 2-56 nylon nuts (Radio Shack) through this tube and holes in the ply are placed on the ends of the plunger, fuselage sides. Make several sets of holes along with a 3/8-inch long piece of a for different weather/towhook loca­ ballpoint pen spring. The spring should tions. be stiffer than the glide turn actuating You will need some kind of forward spring. The nut at the front of the stop for the arm. I use a piece of 1/16 ply plunger controls the glide setting. When screwed to the bottom of the fuselage. the plunger is pulled fully forward, the Slots in the ply allow fore-and-aft adjust­ two rudder stops above it control the ment of the stops for different towhook straight tow and circle tow positions. locations. Locate the stop so the arm is These stops are identical to those I raked back about 1/8 inch from the normally used on straight tow ships: pivot point at the straight tow (fully plexiglass stops and a plexiglass bar forward) position. This allows you to tapped for 0-80x1/2-inch brass screws. bring the model in front of you before The only additional feature added for Elton Drew suggests using a mechanical latch beginning its circle, and shouldn’t be circle tow is the plunger, which is to prevent premature releases, made from overdone, since too much rake will mounted in a 1/4-inch long piece of monofilament passing through twanger hook. make good zoom launches difficult. plexiglass glued to the rudder. You Pulls out of the way when spring extends far The plunger arm provides the second could substitute a piece of brass tube enough. Twanger and towline flag are a com­ function. It pulls the regular glide circle plete unit, attached to towline via a steel cable epoxied to a piece of spruce instead. leader. Ball bearing swivel at base of twanger stop out of the way during the tow, spring prevents line twists. permitting a tighter circle to be made on The two rudder stops above the

Overall view of twanger system. Hook and spring rest in ring on end Twanger can be locked in straight tow position for windy weather of swinging arm during all towing maneuvers. flying by a line running from arm to timer start mechanism.

AUGUST 1979 65 R/C MODEL BUILDER I A

Left side of rudder shows plunger to give tighter circle for circle towing. Plunger pulls away, is locked in place at timer. Upper stop sets circle tow position. When plunger is released, nut on left (towards front of rudder) sets glide circle.

Bob White (holding model) and crew of helpers (I to r: Jason Kendy, Bob Tymchek, Bob Piserchio, and Irv Aker) that helped him set a new Unlimited Rubber record of 88:24 at Taft on March 11, 1979 Aluminum rudder horn epoxied to side of rudder. Line length is (see last month's F/F column for more details). To top it off, 3 adjustable via the nylon nut and DuBro Rigging Coupler. weeks later Bob set another record, this one in Coupe, of 24:34, again at Taft. Congrats, Bob! Photo by Toni White. plunger could be omitted, using the forward stop on the swinging arm for the straight tow stop, the forward nut on the plunger for glide circle, and the rear nut for circle tow. I retain the stops on the rudder so that my model adjust­ ments remainthe same whenthe hook is moved chordwise. They also provide a visual check that all systems are working properly, and I can adjust glide and circle tow independently of each other. My rudder horn provides a convenient way of adjusting line length when the rake is adjusted or the hook is moved. I use an L-shaped piece of aluminum epoxied to the rudder. A rigging coupler and nylon nut is attached to the end of the line, which is connected to the swinging arm. This turnbuckle allows about 1 inch of adjustment, sufficient for nearly all conceivable conditions. I use nylon-coated steel line for my auto­ rudder and plunger lines. This is avail­ able from fishing stores (Sevenstrand Sevalon, 18 lb.), or you could use Prather Products or Lou Proctor's rigging cable, which is higher priced. Use 3/32 I.D. aluminum tubing sleeves, crimped, at each end. The plunger line is attached to my timer start line. After the 1977 Flyoff at Taft, I changed my timer start systems to that shown in the photos. At Taft, I then used a washer on the end of my line, pulling off a pin in the bottom of the

AUGUST I979 67 fuselage. On the flight which kept me "TWANG." As mentioned in last month's out of the flyoff, the auto-start line column, this type line requires a good whipped around the fuselage and be­ reel to keep it off the ground and out of came lodged in the rudder horn, pulling the weeds while towing. the model down almost halfway before By the way, I mount my twanger hook the horn pulled out and let the model and spring on a steel cable leader, which 1/12 SCALE R/C release. contains the flag, and tie it to the end of The method I now use was taken from the line. The bottom end of the spring is ELECTRIC RACE a sketch in the NFFS publication by attached to a ball bearing fishing swivel, Harry Grogan. A piece of brass tube is so the line doesn’t get twisted from CAR AND soldered to both the switch and body of circling. The towline flag is a piece of a Seelig timer. This is cut into2partswith polyester sheathing material, glued to ACCESSORIES a Dremel cutting disc. A piece of nylon the steel leader. A flag that is attached at (.045-,055 inch diameter) holds the timer only one point tends to give extraneous switch shut, and the plunger line is "twangs," so this heavier-duty material r THE ORIGINAL hooked onto the nylon. This pulls out is glued for its full length. cleanly, and won’t hang up like the So there you have it . . . a simple, STILL THE BEST washer and pin set-up. As a side benefit, effective system of circle-towing your you can use this to hold the swinging Nordics. It will work as well as any of the IN QUALITY AND arm in the straight tow position if you more mechanically complex hooks, but SELECTION want to lock out the circle function in takes only a fraction of the time to make. windy conditions. Just run a line from The only disadvantage it has is lack of the swinging arm to the timer release. “ snob appeal” to those masochists who The third function, latching, is pro­ feel that unless it takes 50 hours of vided by the wire hook and spring on machine work, it can’t do the job. Try it, I the end of your towline. The hook (.045 think you’ll like it. music wire) sits in a 3/8-inch diameter (In case my description of the system split ring attached to the swinging arm leaves you cold, or you think even this is (either by a fishing snap or a piece of too much work, you could order the nylon-coated cable crimped to the arm MAXAID hook. It’s a small, neat package and ring). The hook and spring will that works on the same systems de­ remain in place during all circle tow scribed here, but I had trouble getting maneuvers, until you decide to release precise enough adjustments on the • 10 Best Selling Bodies the model. Just make sure the line is field, because the works were all hidden tight, then give it a mighty TWANG! by and I was never sure whether I was plucking the line like a bass fiddle. This turning the screws the right way. A sends a shock wave up the towline MAXAID costs $8.50 from NFFS Supplies, which jars the hook loose from the ring. 6519 Meader Ave., Sacramento, CA If your timing is right, you get a nice 95823.) zoom launch into your glide circle as well. NATS UNOFFICIAL EVENTS SCHEDULED The hook is attached to the spring by Terry Rimert sends the following hooking the spring end to a loop in the schedule of Unofficial Free Flight Events, hook. The towline is tied to the loop and sponsored by the NFFS, to be held at this the bottom of the spring, to limit the year’s Nats. This is a good chance for stretch of the spring. The piece of those of you out there who are inter­ monofilament which acts as the timer ested in the more unorthodox events to • 4 Electric Cars Less Radio start is attached to the loop in the hook try out your wings. (There’s no truth to • 4 Cars With Radio & Electronic also. (The hook extends about 1 inch the rumors that this year’s World F/F Speed Controllers into the spring). Champs will be held at the Nats as an The choice of twanger spring is very unofficial event, however.) Contact important. If too weak a spring is used, it Terry (367 Orange Ave., Baldwin, FL is possible for premature releases to 32234) for further details about the occur. As a guide, Jim Thornberry uses a events you're interested in. spring about 3 inches long with an inside diameter of about 1/4 inch. It National Free Flight Society Unofficial takes about 4 pounds pull fora 1-1/2to 2 Nats Events Shedule: inch deflection. (Your local hardware July 29 store has a wide selection of springs to Manhattan Cabin choose from. I picked out a No. 104 Helicopter spring from the Lane Spring Co. of El Autogiro Monte, Calif., which seemed the equi­ Ornithopter valent of Jim’s.) • 4 Race Car Chargers Elton Drew has passed on a further July 30 • 2 Electronic Speed Controllers improvement to prevent premature Nothing • 5 Racing Motors releases with a twanger. He passes a latch line through the loop and hook, July 31 L ______which gives the twanger an additional Rubber Speed mechanical latch, from the stiffness of Ornithopter Send $.50 for Catalog. the 50-lb. monofilament. The length of Helicopter this latch line is adjusted so that it pulls Autogiro clear of the ring at the desired spring Night Flying deflection. I haven’t used it yet, but it Hall of Fame Banquet 12702 NE 124th Street sure looks "right.” Kirkland. Washington 98033 The towline you usewithyourtwanger Aug 1 (206) 827-8606 should not be too stretchy. Use 30 to 40- Electric lb. test Dacron or Micron to get the best

68 R/C MODEL BUILDER The new Cox Cub revolutionizes

Designed for the beginning R/C design make flying the Cub a breeze. pilot, the new CubTrainer has everything We've also included step-by-step flying you need at a price you can afford. Now instructions, plus a list of AMA chartered you can own a ready to fly. engine- clubs, so you can get in touch with an powered aircraft, complete with radio experienced instructor. system, for less than $100! The Cub is available at your local The Cub is entirely factory built hobby shop. The only other things you with radio system already installed. The need are a Cox 880 or 990 accessory kit, Cox .020 Pee Wee engine is also and ten 1Ά volt alkaline penlights. In less mounted and ready to run. There's no than an hour, you're in the air! building or gluing required. Buy the new Cox Cub. It’s your first The Cox/Sanwa fully proportional step toward the fun and excitement of R/C system uses the same high quality R/C flying. stick assembly as our popular 8020 radio. And it's available on three different #1 in Power Modeling. COX HOBBIES INC., a subsidiary of 49 MHz frequencies for simultaneous Leisure Dynamics, Inc., flying. These new frequencies do not 1505 East Warner Ave.. require an FCC license, and won't inter­ Santa Ana, CA 92702 fere with other model plane frequencies. Check the yellow pages lor your nearest hobby s t o r e Simple rudder control and a stable loid cabin, the 2 sub-rudders, and the distinctive side profile. The model was flown as an FAI model at the time of the Ι® 0 § & last World Champs to be held in the U.S. If you can identify it, send your entry to the RCMB office demanding your free subscription for your efforts. STAB REAR ANCHOR AND DT LIMIT LINE, by Louis Joyner (reprinted from FFFliar, newsletter of the Alabama FFFlyers) “ Attaching the dethermalizer limit line to the stabilizer when using a remote fuse or timer DT is often a problem. Here is one solution that is easy to construct and practically fool­ proof. A looped piece of 1/32 music wire is attached to the stabilizer trailing edge, extending past the T.E. about 1/8 of an inch. The inside diameter of the wire loop should be slightly more than 3/32 of an inch. A piece of 3/32 O.D. alu­ minum tubing is attached to the end of the DT limit line, as shown in the sketch. The piece of tubing is then passed through the wire loop on the stab. It is important that the fit of the wire loop be just loose enough to let the aluminum THE HOBBY tube pass. The natural spring of the COMMANDER monofilament DT line holds the tube Now here's a trainer with character! The Hobby out in a “ T” shape. Thus it is easy to attach and detach the limit line.’’ Commander has the motor mounted high on a py­ lon, out of the dirt and up where it is easy to start I used a variation of this idea when and hard to kill. The super tough formed fuselage converting one of my old FAI models to takes the normal training abuses with ease and VIT. The stab limit line had to come up bounces back for more. It's the perfect trainer and about midway through the stab T.E., so fun for everyone! I just drilled a 1/8-inch diameter hole through the ply reinforcement (1/16 ply SPECIFICATIONS: SUGGESTED in this case) and passed the aluminum Span · 48 in. (1219.2 mm) RETAIL tube through the hole. · Area - 275 sq. in. (177430 mm^) Weight - 20-25 oz. (.567 - .708 kg) Mammoth ____Continued from page 36 Engine - .049 $59.95 tail and climb fairly flat, or did they blast down the runway and haul up in a near vertical climb? These are only some of the simula­ tions we are trying to achieve. If you HOLLOW PRE-MOUNTED PRE-MOLDED read over these six very basic sugges­ WING MOTOR HINGES tions a few times, you will realize that a scale modeler’s research shouldn’t stop MODEL MERCHANT· P.O. BOX 3792 · IRVING, TEX. · 75061 at 3-views, detailed pictures showing the number of rivets in a panel, etc. If we are Aug 2 through NFFS Publications (c/o Fred to consider flying scale an event for Cargo Terzian, 4858 Moorpark Ave.. San Jose, personal satisfaction and enjoyment or P-30 CA 95129) for $15, following the meet. dog-eat-dog, no-holds-barred competi­ NFFS Sympo tion, don’t you think that the documen­ Dave is already querying WC flyers for tation needed in competition should details of their designs, so that draftsmen Aug 3 include flight performance data of the in the U.S. can have the whole thing Unlimited Mulvihill aircraft in normal use so that flight ready in time. (If you’re capable of performance can be judged? Note the Aug 4 helping with the drawing, let Dave emphasized “ normal use.” There is a big Embryo Endurance know. By the time this appears in print, difference between the public relations the project should be reaching the panic data figures designed to impress people stages, and any help would be ap­ NATS INTERNATIONAL F/F and those which are actual figures preciated.) PLANBOOK IN WORKS achieved in daily operational use where Dave Linstrum is editing a special THIS MONTH’S MYSTERY MODEL the pilot needs to get home again and fly book in conjunction with this year’s It just dawned on me that all previous the aircraft the following day. Converse­ World Champs, consisting of 3-views Mystery Models I’ve come up with have ly, there have been things done with air­ and articles on ALL the models to be originated on the West Coast. So, to add craft in combat conditions and tests flown there. The book will be 8-1/2x11 a little variety, this month’s MM origi­ made during acceptance exercises that in size, and will be available to fliers and nates from someplace else. If you need a aren’t listed in the pilot's manual either, supporters at the contest, as well as little more help, notice the large cellu­ including looping bombers!

70 R/C MODEL BUILDER LOOK FOR MONEY SAVING OFFER WHEN YOU BUY THE NEW STERLING SPACE SQUIRT.

Background - Official NASA Photograph

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A snappy Land Vehicle developed for 2 channel R/C, expertly designed featuring accurately die-cut Balsa, precisely vacuum-formed parts, Hardware and detailed Plans and Instructions. Outstanding Aerobatic Performance With Engine-Off AUTOROTATION!!!

Truly outstanding in design and performance, the COMMANDER by American is well on its way to becoming an international star. You could pay more, but you can't buy a more responsive, rugged, dependable, versatile or competitive machine anywhere! From the smoothest hover Available at your Dealer or Direct to the most intricate aerobatic maneuver, including Engine- Dealer Inquiries Invited. off Autorotations, it does it all! NEW! Call our "Troubleshooter's HO TLINE" for technical help; a factory trained flyer will answer your call. 6 Call (714)837-7905. A m e r ic a n R (' Helicopters.IrX 23811 Via Fabricante · Suite 102 · Mission Viejo, California 92691 · (714) 837-2676

What it boils down to is that providing would be in visual contact with the checked and calibrated both before and a scale illusion in the air requires as control tower. By that I don’t mean a after runs. Low speed runs were made as much skill, research, and familiarity of speck in the sky, but an aircraft which is well, and these down to a speed where performance as it does to build the identifiable as to type and outline. The the aircraft was in danger of falling out of aircraft itself. What we are generally speed of any aircraft in the WW-II the sky. The aircraft used was our trusty seeing now is nowhere near the level of fighter category is not going to be "Frontier,” which was originally thrown the detailing of the aircraft itself in anywhere near the top speed of the together to test new wing construction average competition. Flying simulation aircraft in level flight under these condi­ methods for drones. The aircraft weighs would be classified as “ stand way, way tions. Even if we consider that this 22 lbs. empty, has an 8-foot span, 20-inch off” scale, but it doesn’t need to be that speed could reach 300 mph, 1/4-scale is chord, and a maximum airfoil thickness way, and I feel that mammoth scale 75 mph flat out. A 100 mph landing of 2-11/16 inches for its constant chord aircraft will lead the way in this field. speed would be 25 mph! Now, how does length. The leading edge radius is about Now to scale speeds. The April 1979 the current crop of 1/4-scale sized average for a fully-symmetrical pattern issue of the English magazine Radio aircraft fit in there? type wing. Wing frontal cross-section Control Models and Electronics has a To find out these figures accurately, area, excluding fuselage center section, summation reprint of the Florida Gold we enlisted the help of the Royal Cana­ is approximately 236 sq. in.,approximate Coast Radio Controller's newsletter by dian Mounted Police, namely Constable fuselage frontal area 90 sq. in., stab 13.5 Art fohnson. In this article it states that P.N. Haugen of the Vernon, B.C. detach­ sq. in., vertical fin 4.5 sq. in., 6-inch Fox the P-82E was the fastest propeller- ment and his trusty gun . . . ray gun, that wheels 30 sq. in. These figures do not driven fighter in the U.S. Air Force. The is. The test was set up as follows. The include landing gear legs, tail wheel, or pilot’s manual states that at maximum aircraft was flown in level flight down­ wetted area, but only major cross- continuous power settings at sea level, wind immediately followed by an up­ section frontal areas which the airstream top speed is 310 mph. If that’s the wind pass starting at an altitude too low "sees." I know that total aerodynamic fastest, then everything else is slower to allow the aircraft to dive to gain drag must also consider the initial point under these conditions. We all know speed, and checked enroute to find a of impact, how it is shaped, etc., but it that there are figures bandied about that “ stabilized” speed, a speed which gives some form of comparison, as these are much higher than that, but they allowed any excessive speed gained or points would be similar to the aircraft weren’t achieved with full fuel tanks, lost entering the test area to be bled off under consideration. The total of these external stores, full ammo belts, un­ or regained to obtain true level flight amounts to 374 sq. in. taped gun ports (if guns were even data. A crosswind check was also made, Now for the shocker. The average top carried for these top speed figures), or at during which drift was compensated for ground speed for Kolbo and Zinger 18x6 the scale altitudes at which we fly our in the same manner. Several runs were props was the same within 2 mph. Both models both in competition and for made with different props of different turned in the air within 150 rpm of each personal enjoyment. diameter and manufacture, but the other for an average of 8250 rpm. The We must also take into consideration same indicated pitch. In-air rpm was two-way average was 118.5 kmh (73.63 that we are flying our models in what checked via Wings Engineering Sono- mph) ground speed. A Top Flite 20x6 would be called “ field perimeter" trak and calibrated on the ground by a turning 7500 rpm in the air averaged 106 conditions; i.e., one in which the aircraft Royal Electronics ProTach. Radar was kmh both upwind and downwind for a 72 R/C MODEL BUILDER BRIDIBIRDS DESIGNED TO MAKE YOU LOOK GOOD IN THE AIR

STAND-OFF SCALE BRIDIKITS

The Good Building, Great Flying Machines

REARWIN SPEEDSTER COSMIC WIND M6000M — Classic 1/4 Scale Goodyear beauty. All balsa Pylon Racer, construction. 96%" glass/foam kit. wing span, .90-1.25 64" wing span, engine. 1/4 scale. ■60-.90 engine. $129.95 $147.95

F-7 TIGERCAT CORBIN BABY ACE Glass/foam kit, All balsa construction two .40 engines, 1/4 scale, .60-.90 65" wing span. engine. Available Available July '79. late 79. $198.95 ANNOUNCING A NEW STAND-OFF SCALE $129.95 BRIDIKIT — JEFF TRACEY AND GARRY REUSCH'S FULLY AEROBATIC CAP 20 L ^ Epoxy-glass fuselage, cowl and wheel pants. Foam wing and stab. Plug-in wing panels. Scale 3%"= 1 ft. 81" — — ^ wing span, 4 channels (2 aileron servos), Engine: 1.5-2.4 cu. in.

Other Stand-Off Scale Bridikits include the Brown Racer, Lockheed Sirius, Chipmunk, AT-K T-28, P-51, Kraft Super Fli, and the Shrike. Coming Soon: Spitfire, Dalotel D-N-165, and Waco.

TRAINER BRIDIKITS 1/4 SCALE BRIDIKITS SPORT FLYER BRIDIKITS Wing Cosmic Wind .60-.90 64" glass/foam Wing Eng. Span Const. Rearwin Speedster .90-1.2596’/«" balsa Eng. Span Const. RCM Trainer .60 .60 60" balsa Corbin Baby Ace* .60-.90 balsa RCM Sportster .19 50" balsa RCM Trainer .40 .40 50" balsa Dalotel D-N-165* .90-1.2578" balsa Tweedy Bird .19 48 %" balsa RCM Trainer .20 .20 45V’ balsa 15-500 .40 51" balsa RCM Trainer .10 .09 36% " balsa * Available late 79 Quickest 500 .40 50%" balsa RCM Trainer .05 .049 36% " balsa Quickest 200 .051 31 %" balsa RCM Basic Trainer .19 50" balsa PATTERN BRIDIKITS Sun Fly 4-20 .19 48% " balsa Deception .60 63" balsa/foam Super Kaos .40 52" balsa SAILPLANES UFO .60 64 V ' glass/foam Dirty Birdy .40 58" balsa Soar Birdy 78" balsa Dirty Birdy .60 64" glass/foam Big Birdy balsa Dirty Birdy .60 64" balsa BOATS Super Kaos .60 58 V ' balsa Chubasco •40-.60 glass Kaos .60 58 V' balsa Chubasco .21 I/O glass

BRIDI HOBBY ENTERPRISES 1611 E. Sandison St., Wilmington, Calif. 90744 (213) 834-0801 7 proportionately less pitch angle than the hub). The point of all this is that in airscrew theory, nothing is 100% efficient, and a H S FOR TUBING notable "slip” allowance must be made. But even considering the prop at 100% efficiency in our radar speed test, the in­ air rpm was 8250, which means that the maximum 100% efficiency would be 4125 feet per minute, or 46.875 mph! We have just submitted to you a radar checked actual speed of nearly 74 mph with the gear hanging down holding 6- inch wheels and an open cockpit. OUR CAREFULLY ENGINEERED UNE OF METAL So, there’s your answer. Yes, large PRODUCTS HAS UNLIMITED USES IN THE DE­ ignition engines will provide the neces­ VELOPMENT OF ALL TYPES OF PROJECTS. ALL sary scale speed. In fact, if you’re think­ OF YOUR METAL NEEDS AVAILABLE IN ONE ing of the older or slower aircraft such as PLACE. WW-I types, you might have to go larger to keep speeds down to realistic rates.

ALUMINUM TUBE 112' RECTANC ULAR BRASS TU BE 1 2 - SHE T METAL <4 "x1 0 ’ } But remember that the added drag of STOCK SIZE PRICE STOCK SIZE PRICE STOCK SIZE PRICE NO EACH NO EACH NO EACH the older aircraft might do this for you. 100 1 16 20 262 3 3 2 x 3 16 1 10 250 0 0 5 Brass 65 Secondly, if you want the crisp high 101 3 32 25 264 1 8x1 4 1 05 251 0 1 0 Brass 95 102 1 8 30 266 5 32 x5 16 1 10 2 5 2 1 0 1 5 Brass 1 25 performance of the faster, more power­ 103 5 32 35 2 6 8 3 16x3 8 1 20 253 0 3 2 Brass 2 20 ful aircraft, try to keep the weight down 104 3 16 40 254” 0 0 8 Tm 50 105 7 32 45 BRASS STRIPS (1 2 - 2 5 5 0 1 6 Alum 50 to 10-13 lbs. per actual hp, properly 106 1 4 50 230 016x1 4 20 256 0 3 2 Akim 75 applied. 10? 9 32 55 231 016x1 2 25 257 0 6 4 Alum ! 2b 232 016x1 40 2 5 8 1 Asst Brass 1 0 0 ROUN 8RASS TUBE(1 2 ") If you have been converted (I hope) to 233 0 1 6 x3 4 35 259 0 2 5 Copper 2 20 125 1 /1 6 30 234 016x2 70 rotating wing theory, you will realize BRASS ANGLE M 2"] 126 3 /3 2 30 235 025x1 4 25 171 35 than when the "lift” your rotating wing 127 1 8 30 236 025x1 2 35 1 8x1 8 172 5 3 2 x 5 32 40 12B 5 32 35 237 025x1 60 (commonly called a propeller) gener­ 129 3 16 45 238 02 5 x3 4 50 173 3 16x3 16 _ 5 0 174 7 32 x7 32 55 130 7 32 50 239 025x2 1 10 ates equals the drag of your aircraft in 175 1 4x1 4 65 131 1 4 55 240 032x1 4 30 level flight, that’s terminal speed in that 132 9 32 6 0 241 032x1 2 40 BRASS CHANNEL (12 ) 133 5 16 65 242 032x1 75 181 1 8 45 attitude. However, when you go truly 134 11 32 70 243 0 3 2 x 3 -4 60 182 5 32 50 vertical, that’s another story. How far 135 3 8 75 244 032x2 1 30 183 3 16 55 136 1 3 /3 2 85 245 064x1 4 50 184 7 32 65 you go is a matter of how much energy is 137 7 16 90 246 064x1 2 85 185 1 4 75 lost in the turn to go vertical, how much 138 15 32 95 247 064x3 4 1 10 SOLD BRASS ROD M 2 " ) 139 1 2 1 0 0 248 064x1 1 50 speed you have left when going vertical, 159 0 2 0 08 140 17 32 1 0 5 249 064x2 2 5 0 141 9 16 1 10 160 1 32 08 and the rate at which forces such as drag 181 3 64 142 19 32 1 20 SQUARE BRASS TUBE (1 2 ") 12 162 1 -1 6 20 eat away the kinetic energy fighting 143 5 8 1 25 149 1 16 40 163 3 /3 2 25 144 21 32 1 40 150 3 32 45 gravity. But the final analysis, when 164 1 8 40 151 1 8 50 COPPER TUBE M 2 " 165 5 32 50 things finally stabilize, is your power in * 117 1 16 25 152 5 32 65 • 1 18 3 32 30 153 3 16 75 terms of thrust in relation to weight. ROUND PLATED SPRING WIRE 12' * 119 5 32 40 154 7 32 85 192 0 3 2 08 However, one thing to remember is that 120 1 8 30 155 1 4 95 195 047 08 even if thrust slightly exceeds weight, SOFT BRASS FUEL TUBING ( H " ) BRASS STREAMLINE*£ TUITUBE 197 0 5 5 0 8 ~1gi I IB I 40 122 I SMALLLL I 75 199 0 6 3 08 you still have to overcome the aero­ dynamic drag at that speed as well. In IF NOT AVAILABLE AT DEALER ORDER DIRECT SEND 25c FOR CATALOG addition, the air speed over the control surfaces might be so slow that you can’t control its direction. Torque and slip­ stream effect can force you off your intended direction and you might think ENGINEERING you have powered out, but have simply Ή 5 . f 69Ί7 West 59th St., Chicago, III. 60638 lost control. Now you may say that I have a 1/4- scale aircraft going 1/4 speed, so it’s going to be 100% realistic, right? Not nec- cessarily, but don’t panic, as that can be true 65.865 mph ground speed. Twenty mph in 1/4-scale is 80 mph, so corrected also in order to protect the The other interesting points were as although the model may appear stopped illusion. The problem we have to correct follows. The average wind speed varied at that airspeed, so would the full-sized is that while we have a 1/4-scale aircraft from 8 kmh (approximately 5 mph) to 38 aircraft at 80 mph wind speed. flying at 1/4 speed it will look right kmh (23.6 mph). This definitely shows Now for the real shocker for those regardless at what distance we fly from the need for repeated runs both upwind people who still believe in airscrew us in the air and within our visual range. and downwind with as little time spacing theory and for those who aren’t aware of But if it’s being flown past full-sized as possible and the necessity to recheck our previous column of several issues buildings, trees, etc., it’s going to look by reversing the direction of flight. ago. In airscrew theory, propeller pitch phoney. This is one point where the When you start getting readings which (i.e., 6-inch pitch), crudely put, means static display boys have the advantage average out at less than 2 mph, you’re that the angle of the blade is set so that it over us. They can provide 1/4-scale close enough for our purposes. would "screw” through the air at the shrubbery, buildings, etc. in the model The slowest speed at which I was able rate of 6 inches per revolution, provided display area so their total scene is going to maintain altitude and control the it had no resistance to cause it to slip. to look right. To make the background aircraft readily (fully symmetrical airfoil) People who subscribe to airscrew theory look right in 1/4-scale it will have to be 4 using ailerons was 33 kmh (20.5 mph). go to great lengths to ensure that this times the distance behind the model. In This was the repeated average of both pitch is helical, that the tip which is other words, if you wanted to provide upwind and downwind runs. Remem­ turning faster than the hub screws ahead the illusion of an airdrome and your ber that wind speed must be scaled. at the same rate (the tip w ill have aircraft was 200 feet from you, the

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MOST BACK ISSUES OF "MODEL BUILDER" ARE STILL AVAILABLE, THOUGH SOME ARE IN SH3RT SUPPLY. ORDER NOW, WHILE THEY LAST! PRICES VARY ACCORDING TO QUANTITY REMAINING IN STOCK. NOTE SPECIAL ANNIVERSARY PRICES LISTED BELOW! Apr. 75 2.001 ) : s p e c i a l i n : May 75 3.001 ) Jun. 75 1.251 ) Put a check mark ( ) by the back issues you MODEL BUILDER MAGAZINE'S Jul. 75 *1.251 ) wish to order. Magazines will be mailed by Sec­ • ANN/VERSARY BACK-ISSUE SALE ! ! * Aug. 7502.001 ) ond Class, postpaid. Foreign orders (except Sap. 75 01.251 ) Canada, Mexico, FPO, APO) add 304 per copy. • ANY ISSUE MARKED WITH "o" 75 Cents! j Oct. 75 01.251 ) Allow about four weeks for delivery. If United Nov. 7501.251 ) Parcel Service (UPS) is desired, add 804 mini­ • ANY ISSUE MARKED WITH " · " 50 Cents! ! Dee. 75 01.251 ) mum for up to two magazines, or add 804 plus f c ...... Λ Jan. 76 01.501 I l(ty for each additional magazine on orders for Fab. 76 01.501 ) three or more. Send check or Money Order (no Nov. 71 S3.00I I May 7301.001 ) Apr. 7401.001 ) Mar. 7601.501 ) cash, please, and no COD’s). A facsimile of this Ok . 71 2.001 ) Ail. 73 · 1.001 ) May 74 1.001 ) Apr. 76 01.501 ) Aug. 73*1.001 ) Jun. 74*1 .0 01 ) order form may be used. Jan. 72 01.001 I Jun. 7601.501 I Sap. 7 3 *1 .0 01 ) All. 74 01.001 I N«m·: ______- ______f a·—< ) Jul. 76 01.501 ) Oct. 7 3 *1 .0 01 ) Aug. 74*1.001 I Aug. 76 through M/A 72 ·1 .0 0 ( I Nov. 7301.001 I S/O 74*1 .0 01 ) June 78,1.501 I Address: May 72 2.001 ) Dec. 73*1.001 ) Nov. 7401.001 I Jun. 72 3.001 I July 78 Sold Out Dec. 7401.001 ) •Aug. 78 to date Ait. 72 4.001 I Jan. 74 01.001 ) City: ______Stat«: Jan. 75 0 2.001 I each 2.001" ) F/M 73 2.001 I Fab. 74*1.001 ) Fab. 75 2.001 ) *Nov 78 Sold out Apr-73 3.001 I Mar. 7401.001 ) Mar. 75 2.001 I PLEASE PRINT^ z ip : . MODEL BUILDER. 621 West Nineteenth St., Costa Mesa. Ca. 92827

background would have to be 800 feet if you have a small group and you're disappointed in the noise level at that beyond your aircraft (1/4 scale of 800 worried about people entering sport power setting. feet is 200 feet). The realism you could scale with a model which should be in We are working with our thrust tester achieve is downright scary, but remem­ other higher professional categories, try now and are getting some interesting ber that only the full-sized objects which forgetting about the static judging results, but with the recent trucking are the correct "scale” distance away entirely and judge the entire flight from strike in the USA we don’t have sufficient from you will appear correct. The fore­ takeoff to landing for realism in the air. props and prop blanks to make a com­ ground, if prominent, will distract from Isn't that what it’s all about? plete chart. We want to give you a chart the illusion. You can adjust the distance While at Toledo I was able to ex­ that you can use and one that means from you and the model (within reason) change ideas and info with people such something. The figures we have ob­ to make the predominant background as Sid Axelrod, the propeller man of Top tained so far are very close to the Top look right. There is one more limitation, Flite, and found that much of the work Flite chart statically. In the end they will and that is that you can’t make the we are doing on large propellers suited be far more accurate, but for the present, aircraft appear to fly behind the object to our engines has been done for the compare the readings this chart pro­ without actually doing so. You can see full-sized people using model props to vides with advertised figures that are from this that there is a lot of skill gain data. In many parts of the world, bandied about. Some are too conserva­ required to make a model look right in noise pollution is a problem. The model tive while others are optimistic, to say the air, but the more factors you have industry has been asked to get down to the least. Mammoth scale models re­ goinfe for you, the more realistic it will 82 db at various distances. In layman's quire facts with which to work, and R/C be. language, db is the unit of measurement Model Builder will provide them. Mammoth scale models have brought used to determine sound pressure level Both Dick Phillips ("Big is Beautiful” in out the photographer in a lot of us. In values. The chart shows results of tests RCM ) and I have noticed that the addition to being more dynamically done with Top Flite propellers. It makes majority of correspondence which we correct, these larger models fly for interesting reading. Note that even at receive is from the older generation. smoother. It isn’t only the movie makers taxiing speeds, the proposed noise level Many are from the full-sized field and who have discovered large R/C models. limit is exceeded. Admittedly, the dis­ many are building models for the first With photo equipment with sound, tance from the source that the measure­ time, using the techniques used in full- telephoto lenses, etc. now available at ments are taken has a great bearing, but sized aircraft (especially in the area of home prices, the club’s photo sessions suffice it to say, it is a major factor. safety and good workmanship). Could it are a lot more interesting. If a club or The center column, 20x6 CAP, is an be the mammoth scale, rather than organization is holding a scale flying experimental prop which in theory was cause the loss of modeling which many meet and there is a choice of flying designed to reduce noise. Note that doomsday forecasters predicted, will be areas, they can do a lot for everyone if while it did reduce noise, there was also the catalyst which allows it to continue they have the correct background. The a loss of static thrust at the same rpms. and provide guidelines for others to moral of the story is that if you like scale, Since the reason we make all that noise follow? Sport or Precision, you are missing the anyway is to produce thrust, by the time The predominance of mammoth scale biggest advance in realism if you are not we up the power and rpm to gain it back, at Toledo was such that I would have flying in a scale-like manner. I’m afraid someone is going to be hated to be a judge. No one could 76 R/C MODEL BUILDER DUAL RANGE Expanded Scale Voltmeter FIELD SUPPORT BOX The only device which allows pilot to predict safe flight time A quality field support box at a reasonable price. available from receiver and transmitter Ni-Cads. IT’S A FACTI If you fly R/C, sooner or later you'll have a battery failure! There are • Ready to use ■ NOT A KIT just two ways to find that out: • Roto-cast polyethylene 1. CRASH YOUR AIRPLANE. 2. MEASURE THE POTENTIAL OF YOUR BATTERY BEFORE • Light weight and practically Y O U F L Y I indestructible There is no more accurate, easier to use, less expensive, more versatile • Attractive and easy to keep clean device available than the Craft-Air Dual Expanded Scale Voltmeter. • Holds any site can of fuel securely • Know how much safe flight • Removable 4x7x4 ditty well in top time is available before each • Has room for mounting power flight. panel, etc. • Know the voltage available to the receiver and transmitter. • Know the condition of the airborne battery. • Holds any size transmitter securely • Know the condition of the > Holds any starter in special starter transmitter battery. well • Plot a characteristic voltage vs time curve at simulated load. > Holds any motorcycle or Gel-Cell battery securely • Cycle the batteries to prevent memory. λ ο λ n c • Detect shorted or weak cells before it’s too late. 5 0 1 $ 2 4 .9 5 • Large 12’/4x654x2 drawer for props, • Use the meter on any 4-cell (4.8 volt) Ni*Cad battery. tools, etc. • Use the meter on any 8-cell (9.6 volt) Ni-Cad battery. • 10 minute instructions for optional aircraft cradle Built-in load simulates normal average flight battery load. 500___$29.95 1 YEAR GUARANTEE

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complain, as they did at Vegas, that they There you have it, a really beautiful except that it uses a one-inch balsa slab weren't up to standard. It would have and distinctive Peanut which flies as well for the fuselage. Evidently the extra been easy to award the prizes to mam­ as it looks. Any questions about the width costs nothing in terms of required moth scale models only because they model can be directed to me care of trim weight in the nose. Murph used a deserved it, but that would have been as RCMB. · Dremel routing tool to hollow out the popular as giving all the Christmas cowling. I’m consistently amazed to see goodies to one child in a family of Soaring...... Continued from page 27 how his planes go together, as if by twelve. To me, and I’m sure also to magic, in a dust-free workshop. Blink an others, every model was a winner, and We’re now accustomed to flying eye and it’s ready to fly. I expect to see your participation was appreciated by converted U-control craft on the slope. more of these appear at Torrey Pines. everyone who attended. These profiles are particularly suitable Can’t wait to see aerobatic competition We gathered a lot of info at Toledo for pylon racing (maximum weight of 34 or formation flights. Let’s start with the and will present this information as well ounces). Lloyd Standley has now come Super Profile. as some test evaluations in our next up with a Super Profile. This pseudo P-51 has a 54-inch span comprised of the The more efficient a plane becomes, article. In this way you can make com­ the harder it is to land (that’s why you parisons between similar products. outboard sections of the Ridge Runner wing (9-inch root and 6-inch tip). It need spoilers for the larger craft). A case Thank you to all of you who stopped in point is the Windfreak. I’ve now been by our booth in Toledo with many kind weighs in at 34 ounces without ballast, and in fact needs none in the nose to flying one of these built by Arlie Simp­ words about the Mammoth Scale col­ son, of Atwater, CA. It’s built standard, umn in R/C Model Builder. · make it trim properly. The nose cone and engine cowling are lathe-turned according to the design of Roger Sanders (also of Atwater). Details on this bird Peanut...... Continued from page 59 balsa. Half of the cowling comes off to allow access to the radio installation. The appear in the November 1978 issue of RC Modeler. This sailplane is very leading edge (with motor installed, of fuselage is 3/4-inch balsa with large responsive and handles well, except course). Providing that everything is lightening holes. The pine or fir skid is that it doesn’t want to come down! I’m correctly aligned, the model should fly permanently affixed to the wing and can using three servos in order to experi­ straight from the board; if it doesn’t, be be replaced by heavier material when ment with dive brakes under the wing. patient. . . carry out one adjustment at a ballast is needed, but I’ve seen this bird These do not affect pitch and are mar­ time and you’ll slowly get it right. (There fly in a 30-knot wind without ballast. The is a super passage on trimming models in stinger on the tail is removable to ginally useful. With the chance to do it the “ Flying Scale Models of WW-II” provide access to the elevator control over again, I would have had these on book, available from R/C Model clevis, which is inboard. Lloyd demon­ top of the wings to act as spoilers, but it’s Builder.) strates that this plane can perform axial too late now. All I can do is enjoy, enjoy, For 100% scale modelers, the color of rolls, outside loops, gentle stalls, stays up enjoy. "Little Butch” is midway between Insig­ in light air, and is rigid on impact. What Bill Kaiser of San Francisco has come nia Red and Maroon, probably equiva­ more can you ask? up with the "Two-Yard Canard,” an lent to Stinson Red Q-1913, which was Murph Misiewicz has now built a aerobatic slope soarer that’s different widely used in the USA in the late 1940’s. sister ship identical in every regard, . . . to say the least. There might be some

AUGUST I979 77 the past three years, and have yet to break a wing on launch. According to Clell, even novices can use a winch equipped in this manner with very little instruction. The line tension is calibrated by using a fish scale on the end of the SHIRTS line, and adjusting the maximum pull to DISPLAY THE EMBLEM THAT TELLS EVERYONE about eight pounds for two-meter and YOU'RE A SUPPORTER OF other light planes, to 10 pounds for average planes such as an Aquila, and to 12 pounds for larger unlimited aircraft. In point of fact, it becomes easier to add a rubber band to the nose gear spring to change the tension, then to adjust the set screw as you launch planes of dif­ ferent size. Clell wants to publicize this device in the hope that it will save wings and become a standard part of our launch apparatus. Let’s hope so. See you next month. ·

Prod. Review .. Continued from page 30 micro servos and receiver, and barely made it. The aileron servo gets mounted on the wing in time-honored fashion. A 100 mah battery pack fits in the nose ahead of the first former, and behind the fuel tank. The side views supplied by the manufacturer are very optimistic about (COMING OR GOING . . . THE EMBLEM IS ON FRONT AND BACK!!) servo mounting. The first time I tried mounting the elevator servo, it inter­ fered with the aileron linkage. It turned out to be very difficult to get a third EACH, INCLUDING THIRD CLASS POSTAGE. ADD 50* PER servo in place to operate the Hiscott $5 95 throttle. The receiver ended up behind SHIRT FOR FIRST CLASS OR U.P.S. SHIPMENT. OVERSEAS the wing, in the rear portion of the ORDERS ADD 50* PER SHIRT. fuselage. A friend of mine who has had a Tiny Ace has never flown it, since he can’t get his small radio (normal minia­ ture servos) into it. As it was, it took me MEN'S ...... Available in S, M, L, and XL sizes, and a choice two nights and three tries to get every­ of white, yellow, or blue. thing to fit. LADIES...... Available in S, M, and L sizes, and a choice The fuselage is quite heavy, and also of blue or yellow. very strong. I had fears that the plane wouldn’t fly, but these fears turned out CHI LDREN'S . Available in S and M sizes, and a choice to be due to my lack of experience with of white or yellow. fast half-A planes. Not much decoration When ordering, state style (men's, ladies, children's), size, and color. is supplied with the kit, but the plane looks fine if you just add a line or two to California residents add 6% sales tax. delineate the canopy from the rest of the fuselage. I didn’t follow the instructions 0 for the elevator linkage; I put the horn PRODUCTS just off the centerline, and let the MODEL BUILDER control rod come out the back of the 621 West Nineteenth St., Costa Mesa, California 92627 fuselage. If you use the landing skid provided, you will have to use their lead- out hole and put the horn off to one advantages in moving the stab out of the The 34-inch diameter disc is a semi- side. plane of the wings, but even without symmetrical airfoil with the main spar TRIMMING this, it’s an interesting configuration. and CG one-third aft of the nose. The There is nothing to do with the Sporta- You’ve got to remember that the CG is rim is 3/32-inch plywood; all the rest is via. I had to move the battery pack back now far forward of the usual place. It balsa. The radio is a Hobby Lobby with until the ship balanced on the spar, as flies, flies, flies. Unfortunately, Bill tells the Kraft mixer on top. Believe it or not, the instructions say. Make sure the me that he has no plans available for this this craft has gone up the winch a controls are centered and you are ready. ship. Incidentally, he’s been involved number of times. It's a sight for sore Given enough altitude, and if the ship is with a nine-foot, electric-powered, eyes. trimmed straight ahead, the Sportavia helium-filled blimp with a six-inch will recover hands off from any attitude. propeller that swivels left and right, up Clell Dildy, of Panama City, Florida, has designed an automatic constant It recovers more quickly given the and down, on the rear end of the modifications mentioned below. fuselage under the bag. We wish him tension device to improve the perfor­ mance of electric winches. The model The Tiny Ace will fly if set up normally, good will on his new adventures with as shown in the instructions, but it will fly new designs. shown is easy to hold, portable, and can be coupled with any winch that uses a a lot better if the ailerons are both set a Spencer Wirner has been flying a standard DC connector for the foot few degrees up! This gives the wing a bit saucer ... a circular airfoil elevon switch. Fliers in the Panama City area of reflex, rolls are cleaner, and inverted controlled glider. This is his own design. have been using devices such as this for Continued on page 84

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Devcon THE GUIDE TO ALL YOUR MODELING NEEDS! Introducing the catalog you've been waiting for - the NEW mat. This chart enables you to determine what accessories you 1979-1980 Tower Hobbies RC Catalog! This is the largest and will need to complete the kits listed in this catalog. most complete RC catalog ever published, by far! This new cat­ Other outstanding features of this catalog are the special sec­ alog is much more than just a list of available products at super tion introductions that appear throughout. These introductions low prices. It's actually a complete modeler's reference guide, were written specifically to add to the general knowledge of featuring two indexes (manufacturer and product indexes) to someone new to the RC hobby. Even if you've been a Tower make finding a needed item fast and easy. customer for years, we hope these introductions will answer We developed the actual descriptions from a modeler's point some of your questions, provide you with helpful hints, and of view! We know from experience the questions you need an­ entertain you! swered in order to make that important buying decision. If after Remember, this 358 page Tower Hobbies RC Catalog was reading the descriptions, you still aren't sure of something, you developed for you, the modeler, and contains everything you'll can use the TOWER ACTION POST CARDS supplied inside the need to enjoy your hobby to its fullest! This Radio Control catalog to write directly to the manufacturer for more informa­ "Bible of the industry" will be included free of charge with tion. This is just another customer-oriented service you've come your first merchandise order from Tower Hobbies. Or, it's *■ to expect from Tower! We've also included a revised and up­ available by itself for $2.50 postpaid. ORDER TODAY! dated accessory completion guide in an easy to use chart for­ TOWER HOBBIES P.O. BOX 778 CHAMPAIGN, ILLINOIS 61820 217-384-1010 CALL TOLL FREE: ILLINOIS TOLL FREE:

Q4 W 800- 637-7686 800- 252-3336 P.O. BOX 778 CHAMPAIGN, ILLINOIS 61820 217-384-1010 CALL TOLL FREE: ILLINOIS TOLL FREE:

800- 637-7686 800- 252-3336 THESE SPECIALS ARE GOOD UNTIL THE 15th OF THE MONTH OF THIS ISSUE. ONLY. ALL SPECIAL PRICES ARE SUBJECT TO CHANGE IF RETAIL PRICES CHANGE DURING SALE PERIOD. MILLER No.2017 QUADRA 2 CU. IN. 29% TOP FLIT E 30% DREMEL 41% O FF OFF SPRAYSET ENGINE OFF SEALING IRON M O D E L 381 MOTO-TOO W ITH FU LL ACCESSORI This sealing iron is great for covering with Monokote, Solar- The Model 381 is the ultimate in film. etc. It features adjustable Complete set Includes a precision Develops 2 horsepower! An engine hand grinders. It features variable suitable for large models with its temperature, teflon shoe, and a built genuine piston type air com­ speed control, ball bearings, and pressor, 12 ft. air hose. 16G siphon scale-like sound and realistic per­ handy shape. Excellent quality. full accessories. type spray gun & 14G air brush both formance. Comes with muffler, RETAIL NOW O N LY$13.98 RETAIL NOW ONLY $42.98 with open & fine spray nozzles. mount, and Tillitson pump/carb. $19.95 MBM313 $72.95 MBM153 RETAIL NOW ONLY $46.78 RETAIL NOW ONLY $99.98 $77.95 MBM228 $139.95 MBM260 GOLDBERG 40% K&B .40 RC ENGINE 40% DEVCON 36% OFF D R E M E L 572 FALCON 56 MK II OFF No. 8011 OFF 5 M IN U T E M OTO SH

EPO X Y IN THE MOST ECONOMY POPULAR RC ENGINE EVER 9 OZ. S IZ E MADEII

Now in squeeze This all time best seller is now re­ Features a unique design for high bottles for your This deluxe saw features a complete designed with ailerons. 56" span. power; and a Perry carburetor accessory set of blades, discs, etc. convenience. Limit Uses a .30 -.40 engine, all balsa for excellent throttle response and of 3 per order. and flexible shaft. construction. An excellent trainer. easy adjustment - from a slow RETAIL NOW ONLY $3.98 RETAIL NOW ONLY $60.98 RETAIL NOW ONLY $28.78 smooth idle to a roaring top speed. $6.25 MBM151 $94.95 MBM154 $47.98 MBM020 RETAIL NOW ONLY $43.48 $72.50 MBM200 SULLIVAN ELECTRIC BOLINK POWER PACER GOLDBERG 40% STARTERS ELECTRIC CAR BATTERY SKYLARK 56 OFF TESTER M K II

HI - torque, hi - rpm 12 v. starters. A new ni-cad battery tester, These heavy duty, long life starters This 2 ch. 1/12 scale electric car Fun to fly sport airplane with pat­ develop more torque end rpm '! than comes already assembled with .05 I cycler, and charger. Works great! tern capabilities. 56” span. .30 to any other startersl motor, niceds, & charger. Goes over ! RETAIL NOW ONLY $23.98 25 miles per hourl RETAIL NOW ONLY $46.98 .40 size engine, all balsa constuc- $38.95 MBM305 RETAIL NOW ONLY $79.98 $59.95 tion. New improved design I Dlx. model has V-groove In drive $99.95 MBM118 cone for starter belt. Starts copters, Bolink kit for above car - must MBM259 9.6 volt RETAIL NOW ONLY $29.98 airplanes, boets, and cars. be assembled. BLX-155. MBM024 6 volt $49.95 MBM181 RETAIL NOW O N LY $27.28 RETAIL NOW ONLY $59.98 $41.95______MBM306 $79.95______MBM117 CRAFT-AIR 33% CRAFT-AIR 38% CRAFT-AIR S & O BATTERY 33% D R IF T E R II T E ST E R OFF F IE L D BO X OFF HI - S T A R T OFF H E A V Y D U TY Features reel, tubing, towline, parachute, stake, tow ring, and strong construct­ It's ready to use. not a kit. made ion. For sailplanes of 100" wingspan of lightweight indestructible pol­ Would you believe? A competition Tests 8 cell transmitter and 4 cell re­ and larger. yethelene. 22" long & holds sailplane for only $13.98! It isn't ceiver nicad packs under load. Ex­ everything. A SUPER BUY! just a trainer, it's a contest winnerl tremely accurate scales. Detects bad RETAIL NOW ONLY $19.98 RETAIL NOW ONLY $32.98 71 Vi" span. Uses a 2 channel radio. cells and/or abnormal current drain $29.95 MBM148 $52.95 MBM141 RETAIL NOW ONLY $13.98 RETAIL NOW ONLY $19.98 $19.95 MBM142 $29.95 MBM272 P.O. BOX 778 CHAMPAIGN, ILLINOIS 61820

THESE SPECIALS ARE GOOD UNTIL THE 15th OF THE MONTH OF THIS ISSUE. ONLY. ALL SPECIAL PRICES ARE SUBJECT TO CHANGE IF RETAIL PRICES CHANGE DURING SALE PERIOD. HOW TO ORDER HOW TO ORDER HOW TO ORDER HOW TO ORDER HOW TO ORDER BY MAILORDER BY TOLL FREE PHONES

If you have a Tower order form, please use it. If not, then just use any When you place your order over the phone we will ship it to you C.O.O., piece of paper or stationery. Write down all of the items that you want and you pay for it when it's delivered to your door. When you phone in your order, please have the stock numbers written down ready to give to along with their special stock numbers and prices. Total them up (Illinois the order taker. residents add 5% sales tax) and add $2.00 for postage, handling, and full insurance, to obtain the grand total. Obtain a money order, certified check, Continental United States: Illinois Residents Only: bank check, or write a personal check for the grand total amount (personal checks may be delayed to allow for clearance). Foreign orders add $10.00 800 - 637 - 7686 800 - 252 - 3336 (excess will be refunded with order). Date of postmark determines special period eligibility. Send your order along with full payment to: TOWER The "8 0 0 " WATS lines are open weekdays from 9:00 A.M. to 5:00 P.M., HOBBIES. P.O. BOX 778, CHAMPAIGN, ILLINOIS 61820. Monday through Thursday evenings 5:00 P.M. to 9:00 P.M., and 10:00 A. M. to 5:00 P.M. on Saturdays. Closed Friday evenings and Sunday.

STOCK NOW STOCK NOW NUMBER DESCRIPTION RETAIL ONLY NUMBER DESCRIPTION RETAIL ONLY

M B M 4 0 0 Cox Hydroblaster w/.049 & Radio . . $ 1 0 9 . 9 5 $ 7 4 . 9 8 M B M 1 7 5 F o x . 6 0 R C E a g l e ...... $ 6 9 . 9 5 $ 4 1 . 9 8 M B M 1 0 5 A i r t r o n i c s A q u l l a ...... 7 4 . 9 5 5 2 . 4 8 M B M 1 7 2 Fox .40 RC Schneurle ...... 4 5 . 9 5 2 8 . 4 8 M B M 1 0 6 Alrtronics Olym pic II ...... 4 9 . 9 5 3 4 . 9 8 M B M 1 7 4 Fox .45 RC Schneurle B B ...... 6 4 . 9 5 3 9 . 9 8 M B M 1 0 7 A-Justo-JIg W ing & Fuse Jig ...... 5 9 . 9 5 4 1 . 9 8 M B M 1 7 6 Fox .60 RC Hawk Engine ...... 8 4 . 9 5 5 2 . 6 8 M B M 1 0 B Andrews Arc-1 S-Ray ...... 3 4 . 9 5 1 9 . 9 8 M B M 3 9 2 Goldberg Falcon 56 M K II ...... 4 7 . 9 5 2 8 . 7 8 M B M 4 0 1 Dumat Dauntless ...... 7 5 . 0 0 4 4 . 9 8 M B M 1 8 1 Goldberg Skylark 56 M K I I ...... 4 9 . 9 5 2 9 . 9 8 M B M 3 9 5 Andrews Aeromaster T o o ...... 7 4 . 9 5 5 1 . 9 8 M B M 1 8 2 Goldberg Skylane 6 2 ...... 6 4 . 9 5 3 8 . 9 8 American RC Helicopters ...... Call For Low Prices M B M 1 8 3 Goldberg Senior Falcon ...... 6 4 . 9 5 3 8 . 9 8 M B M 4 0 2 Dumas 12 v. Pittman Boat Motor. . 2 7 . 5 0 1 8 . 9 8 M B M 1 8 4 Goldberg Handi-Tote ...... 1 6 . 9 5 1 1 . 8 8 M B M 1 1 2 Associated RC200 Car K it ...... 1 9 5 . 0 0 1 1 9 . 9 8 M B M 1 8 5 HB .12 RC BB w /M uffler ...... 3 9 . 8 7 2 7 . 8 8 M B M 1 1 3 Associated 6-Cell Car Kit w/o Body 1 0 2 . 0 0 6 9 . 9 8 M B M 1 8 6 HB .15 RC BB w /M uffler ...... 4 3 . 2 3 3 1 . 9 8 M B M 1 1 4 Badger 200-1 Air Brush K it ...... 3 2 . 9 5 2 1 . 3 8 M B M 1 8 7 HB .25 RC BB w /M uffler ...... 5 6 . 0 0 4 0 . 8 8 M B M 1 1 5 Badger 200-3 Deluxe K it ...... 4 2 . 9 5 2 7 . 8 8 M B M 1 8 8 H B . 4 0 R C B B ...... 6 9 . 4 4 4 9 . 9 8 M B M 1 1 6 Badger 180-1 Com pressor ...... 8 5 . 0 0 5 9 . 4 8 M B M 1 8 9 H B . 5 0 R C B B ...... 7 6 . 2 7 5 4 . 9 8 M B M 1 1 7 Bolink 6-Cell Car K it ...... 7 9 . 9 5 5 9 . 9 8 M B M 1 9 0 HB .40 RC BB PD P ...... 8 4 . 3 4 6 1 . 9 8 M B M 1 1 8 Bolink 6-Cell Electric C a r ...... 9 9 . 9 5 7 9 . 9 8 M B M 1 9 1 HB .61 RC BB PD P ...... 1 1 9 . 2 6 8 7 . 6 8 M B M 1 1 9 Bridi Soar Blrdy Glider ...... 1 9 . 9 5 1 3 . 5 8 M B M 1 9 2 Hobbypoxy Formula 2 hpoxy-8 oz. . 4 . 2 5 2 . 9 8 M B M 1 2 1 Brldi Sun Fli 4-20 ...... 2 9 . 9 5 2 0 . 3 8 M B M 1 9 3 Hot Stuff Adhesive .5 oz ...... 3 . 9 5 2 . 7 8 M B M 1 2 3 Bridi RCM Trainer 4 0 ...... 5 4 . 9 5 3 7 . 3 8 M B M 1 9 4 House of Balsa P-51D (.29 to .40) . . 6 4 . 9 5 4 4 . 9 8 M B M 1 2 5 Brldi Dirty Blrdy 40 - w ood ...... 5 9 . 9 5 4 0 . 7 8 M 8 M 3 8 9 House of Balsa .40 P-51 D - glass. . . . 1 0 9 . 9 5 7 9 . 9 8 M B M 1 2 6 Bridi RCM Trainer 6 0 ...... 6 2 . 9 5 4 2 . 7 8 M B M 1 9 5 Jemco P-51 M ustang ...... 6 4 . 9 5 4 5 . 4 8 M B M 1 2 7 Bridi Super Kaos 6 0 ...... 6 9 . 9 5 4 7 . 5 8 M B M 1 9 6 Jemco AT-6 Texan ...... 6 4 . 9 5 4 3 . 8 8 M B M 1 3 0 Brldi U FO - fiberglass ...... 1 2 9 . 9 5 9 3 . 5 8 M B M 1 9 7 Jemco F4U-1 A Corsair ...... 7 9 . 9 5 5 5 . 9 8 M B M 1 7 3 Fox .45 RCSchneurle ...... 5 1 . 9 5 3 2 . 1 8 M B M 3 9 3 Jemco F6F Hellcat ...... 8 4 . 9 5 5 9 . 4 8 M B M 3 9 6 B r id i D e c e p t i o n ...... 8 9 . 9 5 6 1 . 1 8 M B M 1 9 8 Jensen Das Ugly S tic k ...... 6 9 . 5 0 4 6 . 9 8 M B M 1 3 2 Coverite Balsarite 8 o z ...... 3 . 2 0 2 . 3 8 M B M 2 0 0 K & B . 4 0 R C E n g i n e ...... 7 2 . 5 0 4 3 . 4 8 M B M 1 3 3 Coverite Glaskote ’Λ p t ...... 2 . 9 5 2 . 1 8 M B M 2 0 1 K&B .40 RC Pressurized ...... 1 0 5 . 0 0 6 2 . 9 8 M B M 1 3 4 Cox Tee Dee .049 Engine ...... 2 4 . 9 5 1 5 . 9 8 M B M 2 0 3 K& B.61 RC w/Muffler ...... 9 6 . 9 5 5 7 . 8 8 M B M 1 3 5 Cox Tee Dee .09 Engine ...... 2 6 . 9 5 1 7 . 4 8 M B M 2 0 4 K&B .61 RC w/Muffler & Pump . . . 1 2 5 . 0 0 7 4 . 9 8 M B M 3 8 7 Cox Tee Dee .051 Engine ...... 2 4 . 9 5 1 5 . 4 8 M B M 4 0 3 Goldberg P6E Curtiss Hawk Bipe . . . 4 4 . 9 5 2 9 . 9 8 M B M 1 3 7 Cox RTF Cub w/Engine & R a d i o . . 9 9 . 9 5 6 9 . 9 8 M B M 2 0 7 K&B .40 RC Sport Marine ...... 8 2 . 5 0 4 9 . 4 8 M B M 1 3 8 Cox RTF Cessna Centurion ...... 6 9 . 9 5 4 7 . 9 8 M B M 2 0 8 L& L On-Board Ignition System . . . . 1 9 . 9 5 1 4 . 9 8 M B M 1 3 9 Cox RTF Sportavia Trainer ...... 8 9 . 9 5 6 0 . 9 8 M 8 M 2 1 0 L a n ie r C a p r i c e ...... 7 3 . 5 0 4 5 . 5 8 M B M 1 4 1 Craft-Air H.D. Hl-Start ...... 5 2 . 9 5 3 2 . 9 8 M B M 2 1 1 L a n ie r J e s t e r I I ...... 7 3 . 5 0 4 5 . 5 8 M B M 1 4 2 Craft-Air Drifter I I ...... 1 9 . 9 5 1 3 . 9 8 M B M 2 1 2 Latrax Corvette w/Nicads and Radio. 1 5 9 . 9 5 1 1 9 . 9 8 M B M 1 4 4 Craft-Air Sailaire ...... 1 3 9 . 9 5 8 3 . 9 8 M B M 2 1 4 Mark's Models Wanderer 7 2 " ...... 2 3 . 9 5 1 4 . 3 8 M B M 1 4 5 Craft-Air Viking M K I Sailplane. . . 7 9 . 9 5 4 9 . 9 8 M B M 2 1 5 Mark's Models Bushwacker w/Acces . 5 2 . 9 5 3 3 . 9 8 M B M 1 4 6 Craft-Air Butterfly I I ...... 4 9 . 9 5 3 2 . 4 8 M B M 2 1 7 M EN Trainer .15 -.25 ...... 3 1 . 9 5 2 2 . 9 8 M B M 1 4 8 Craft-Air Field B o x ...... 2 9 . 9 5 1 9 . 9 8 M B M 2 1 8 Microflame 4400 Dlx. Welding Kit . . 3 9 . 9 5 2 9 . 9 8 M B M 3 9 4 Custom Retracts V4 Scale - mains . . Call For Low Price M B M 2 2 0 Midwest RK-40 Axiflo Fan Kit .. . . 4 9 . 9 5 3 4 . 2 8 M B M 1 4 9 DAE Series IV Power Panel ...... 3 4 . 9 5 2 2 . 4 8 M B M 2 2 1 M id w e s t L it t l e S t i k ...... 3 3 . 9 5 2 1 . 9 8 M B M 1 5 1 Devcon 5 min. Epoxy-9 0 2 ...... 6 . 9 5 4 . 4 8 M B M 2 2 2 M id w e s t C a r d in a l A R F ...... 3 2 . 9 5 2 1 . 3 8 M B M 1 5 2 Dremal 210 Drill Press ...... 2 3 . 9 5 1 5 . 9 8 M B M 2 2 3 Midwest Super Chipm unk ...... 3 3 . 9 5 2 1 . 9 8 M B M 1 5 3 Dremel 381 Moto Tool K it ...... 7 2 . 9 5 4 4 . 9 8 M B M 2 2 4 M id w e s t S w e e t S t i k ...... 4 2 . 9 5 2 5 . 7 8 M B M 1 5 4 Dremel 572 Deluxe Moto-Shop . . . 9 4 . 9 5 6 0 . 9 8 M B M 2 2 5 M id w e s t S t r i k e m a s t e r ...... 6 9 . 9 5 4 1 . 9 8 M B M 1 5 5 Dremel 580 Table Sa w ...... 9 9 . 9 5 6 1 . 9 8 M B M 2 2 6 M id w e s t A t t a c k e r ...... 4 2 . 9 5 2 7 . 9 8 M 8 M 1 5 6 Dubro Lg. Nylon Hinges (15) . . . . 2 . 4 9 1 . 8 8 M B M 2 2 7 M id w e s t P it t s S p e c i a l ...... 9 6 . 0 0 6 3 . 5 8 M B M 1 5 7 Dubro Flex Cable - 2 0 " ...... 1 .4 9 1 .1 8 M B M 4 0 4 HB .40 RC BB PDP M arine ...... 9 3 . 5 0 6 6 . 9 8 M B M 1 5 8 Dubro Kwlk Fill Fuel Pum p ...... 1 0 . 9 8 6 . 9 8 M B M 2 2 8 Miller No. 2017 Spray Se t ...... 7 7 . 9 5 4 6 . 7 8 M B M 1 5 9 Dubro No. 203 Kwik-Switch Mount 1 .7 5 1 .3 8 Monokote Reg. and Trans. Colors. . . 9 . 0 0 5 . 3 8 M B M 1 6 0 Dubro Kwik-HInge Slotter ...... 1 .9 5 1 . 5 8 Monokote Metallic C olors ...... 1 0 . 5 0 6 . 2 8 M B M 1 6 1 Dubro Muff-L-Air II for K&B .40. . 8 . 9 5 6 . 2 8 M B M 2 2 9 M RC RTF Hawk Trainer w/Enya 15 . 9 9 . 9 5 7 4 . 9 8 M B M 1 6 2 Dumas Big Swamp B uggy ...... 3 5 . 0 0 2 2 . 3 8 M B M 2 3 7 M RC 1/12 Scale Leopard Tank . . . . 1 7 4 . 9 8 1 3 9 . 9 8 M B M 1 6 3 Dumas Atlas Van Lines U -1 ...... 5 0 . 0 0 3 2 . 4 8 M B M 2 3 3 M RC Porsche 934 Turbo ...... 7 4 . 9 8 4 9 . 9 8 M B M 1 6 4 Dumas Competition DV60 - glass. . 1 0 0 . 0 0 6 3 . 9 8 M B M 2 3 5 MRC FMC Combat Vehicle ...... 8 4 . 9 8 6 3 . 6 8 M B M 1 6 5 Dumas Hot Shot 2 4 ''Tunnelhull . . 3 2 . 0 0 2 0 . 7 8 N o s e n ...... 28% Off Retail M B M 1 6 6 Dumas Hot Shot 21" - glass ...... 7 0 . 0 0 4 5 . 4 8 M B M 2 3 8 Ohio Superstar Softglas - Q t ...... 9 . 9 5 7 . 9 8 M B M 1 6 7 Edson Adjustable Motor Mount. . . 6 . 9 5 5 . 5 8 M B M 2 3 9 OPS .40 RC Marine w/Tuned Pipe . · 1 4 9 . 0 0 1 1 3 . 5 8 Enya Engines ...... Call For Low Prices M B M 2 4 0 OPS .65 RC Marine w/Tuned Pipe . . 2 1 9 . 0 0 1 5 9 . 9 8 M B M 1 6 8 Fox .15 RC Schneurle ...... 3 7 . 9 5 2 2 . 7 8 M B M 2 4 1 OPS .60 RC Big Red w/Pipe ...... 1 6 8 . 0 0 1 2 4 . 9 8 M B M 1 6 9 Fox .19 RC Engine ...... 3 6 . 9 5 2 2 . 9 8 M B M 2 4 2 Orline Fokker D V II ...... 9 7 . 5 0 6 8 . 2 8 M B M 1 7 0 Fox .25 RC Engine ...... 3 6 . 9 5 2 2 . 9 8 M B M 2 4 5 O.S. Max .60 FSR RC w/Muffler . . . 1 2 9 . 9 5 9 0 . 9 8 M B M 3 8 8 F o x . 3 5 U / C ...... 2 6 . 9 5 1 7 . 4 8 M B M 4 0 5 Jet Hangar .40 Ducted F a n ...... 6 9 . 9 5 5 5 . 9 8 PHONE ILLINOIS TOLL FREE: 800-252-3336 (217) 384-1010 CONTINENTAL UNITED STATES TOLL FREE: 800-637-7686

THESE SPECIALS ARE GOOD UNTIL THE 15th OF THE MONTH OF THIS ISSUE. ONLY. ALL SPECIAL PRICES ARE SUBJECT TO CHANGE IF RETAIL PRICES CHANGE DURING SALE PERIOD.

STOCK NOW NUMBER DESCRIPTION RETAIL ONLY

M B M 4 0 6 K& B .21 RC Schneurle w/Muffler . . $ 7 2 . 5 0 $ 4 7 . 9 8 NOW STOCK M B M 2 4 8 Pacer X-30 Adhesive .36 o z ...... 3 . 5 0 2 . 2 8 M B M 2 4 9 P a c e r Z ap Giant .36 0 2 ...... 3 . 5 0 2 . 2 8 MODEL ONLY NUMBER M B M 2 5 0 Peerless Pop B uggy ...... 1 4 0 . 0 0 9 7 . 9 8 M B M 2 5 1 Pice Cessna 1 8 2 ...... 9 9 . 9 5 6 2 . 9 8 M B M 2 5 2 Pica Spitfire ...... 8 9 . 9 5 5 4 . 9 8 TOWER HOBBIES TOWER HOBBIES TOWER HOBBIES M B M 2 5 3 P ic a T - 2 8 B ...... 8 9 . 9 5 5 4 . 9 8 6 Channel w/2 KPS-14M Servos $139.95 MBM 397 M B M 2 5 4 Pica Focke Wulf 1 9 0 ...... 8 9 . 9 5 5 4 . 9 8 6 Channel w/3 KPS-14II Servos 169.95 MBM 398 M B M 2 5 5 P ic a W a c o ...... 8 9 . 9 5 5 4 . 9 8 M B M 2 5 6 Pica Duelist 2 / 4 0 ...... 8 9 . 9 5 5 9 . 9 8 6 Channel w/4 KPS-14II Servos 199.95 MBM 339 M B M 2 5 9 Power Pacer 9.6 v. Model 3 0 0 ...... 5 9 . 9 5 4 6 . 9 8 6 Channel w/4 KPS-1511 Servos 209.95 MBM 340 M B M 2 6 0 Quadra 2 Cu. In. Aircraft Engine . . . 1 3 9 . 9 5 9 9 . 9 8 M B M 2 6 2 Robert Incidence M eter ...... 1 5 . 9 5 1 0 . 9 8 Tower KPS-14II Servo...... 30.00 MBM 399 M B M 2 6 3 Robert Super Pumper Mark II ...... 1 7 . 9 5 1 1 . 9 8 THIS SALE IS NOT RETROACTIVE M B M 2 6 4 Robert Auto M ix ...... 9 . 9 5 7 . 4 8 NOW STOCK M B M 2 6 5 Rhom 2 Gear-Mains ...... 8 7 . 0 0 5 6 . 5 8 MODEL RETAIL ONLY NUMBER M B M 2 6 6 Rhom 3 Gear-Firewall ...... 1 2 5 . 0 0 7 9 . 9 8 M B M 2 6 7 Rhom 3 Gear-Flat M o u n t ...... 1 2 5 . 0 0 7 9 . 9 8 KRAFT KRAFT KRAFT KRAFT KRAFT KRAFT M B M 2 6 8 Royal Photocell Tachom eter ...... 3 9 . 9 5 3 3 . 9 8 $139.95 $91.98 MBM 344 M B M 2 7 2 S& O Battery Tester ...... 2 9 . 9 5 1 9 . 9 8 KP-2AW (Wheel) w/14IIA's. . . M B M 2 7 3 Schluter Hali-Boy ...... Call For Low Price KP-2AW (Wheel) w/15IIA's. . . 145.95 95.98 MBM 345 M B M 2 7 4 Sealector Custom Model Iro n ...... 2 8 . 3 5 1 9 . 9 8 KP-2A (2 Stick) w/14IIA's . . . 139.95 91.98 MBM 346 M B M 2 7 5 Sig Piper J-3 C u b ...... 4 4 . 9 5 3 2 . 3 8 M B M 2 7 6 Sig Kadet Trainer ...... 3 9 . 9 5 2 8 . 7 8 KP-2A (2 Stick) w/15IIA's . . . 145.95 95.98 MBM 347 M B M 2 7 7 S i g K o u g a r ...... 4 7 . 5 0 3 4 . 1 8 K P-2 AS (1 Stick) w/14IIA's . . 139.95 91.98 MBM 348 M B M 2 7 8 Sig Smith M iniplane ...... 5 4 . 9 5 3 9 . 5 8 M B M 2 7 9 Sig Kavalier ...... 4 4 . 9 5 3 2 . 3 8 KP-2AS (1 Stick) w/15IIA's . . 145.95 95.98 MBM 349 M 8 M 2 8 1 Sig Skybolt ...... 6 9 . 9 5 5 0 . 3 8 KP-4A w/KPS-14IIA's...... 309.95 191.98 MBM 350 M B M 2 8 2 Skyglas Phoenix 5 ...... 5 5 . 0 0 3 6 . 9 8 MBM 351 M B M 2 8 3 Sky glas Vertigo II ...... 7 0 . 0 0 4 5 . 4 8 KP-4A w/KPS-15IIA's...... 321.95 200.98 M B M 2 8 4 Skyglas Phoenix 6 ...... 7 0 . 0 0 4 5 . 4 8 KP-6A w/KPS-14IIA's...... 339.95 212.98 MBM 352 M B M 2 8 5 Slim line Std. Muffler for K& B .35 -.40. . 9 . 9 5 5 . 9 8 KP-6A w/KPS-15IIA's...... 351.95 219.98 MBM 353 Solarfilm Reg. Colors ...... 7 . 9 8 4 . 4 8 M B M 2 8 8 Southern RC Compensator - glass. . . 8 9 . 9 5 5 8 . 4 8 KP-5C w/14ll's or 15ll's...... 389.95 274.98 MBM 354 M B M 2 9 0 Stafford B-24D Liberator ...... 1 8 9 . 9 5 1 2 9 . 9 8 KP-5CS w/14ll's or 1511's----- 389.95 274.98 MBM 355 M B M 2 9 1 Stafford Twin Comanche - balsa . . . 1 3 9 . 9 5 9 7 . 9 8 M B M 2 9 2 Stafford Comanche - balsa wing. . . . 6 9 . 9 5 4 8 . 9 8 KP-7C w/1411'sor 15ll's...... 529.95 377.98 MBM 356 M B M 2 9 3 Sterling Puddle Jum per ...... 1 7 . 9 5 1 2 . 5 8 KP-7CS w/14ll's or 15ll's----- 529.95 377.98 MBM 357 M B M 2 9 4 Sterling Puddle Jumper M K 11...... 4 1 . 9 5 2 9 . 3 8 M B M 2 9 5 Sterling Fledgling ...... 4 1 . 9 5 2 6 . 4 8 BUY A KRAFT 7C OR 7CS RADIO NOW AND RECEIVE M B M 2 9 6 S t e r l in g ΆΑ C o r s a i r ...... 3 1 . 9 5 2 0 . 9 8 A COUPON THAT WILL LET YOU BUY A KRAFT 2 CHAN M B M 3 0 0 Supertigre .40 RC w /M uffler ...... 7 2 . 9 5 4 6 . 8 8 M B M 3 0 4 Sonictronics No. 1250 12 v. Fuel Pump . 1 5 . 9 5 1 1 . 9 8 NEL FOR ONLY $29.95. IF YOU DON'T NEED A 2 CHAN M B M 3 0 5 Sullivan Electric Starter ...... 3 8 . 9 5 2 4 . 9 8 NEL, SELL THE COUPON 8t SAVE EVEN MORE! M B M 3 0 6 Sullivan Deluxe Starter ...... 4 1 . 9 5 2 7 . 2 8 KPS-14II Servo...... 44.95 34.88 MBM 358 M B M 3 0 7 Su ref lite Skylane 182 ...... 3 9 . 9 5 2 5 . 9 8 M B M 3 0 8 Sureflite All Foam J-3 C u b ...... 3 9 . 9 5 2 5 . 9 8 KPS-15II Servo...... 44.95 34.88 MBM 359, M B M 3 0 9 Sureflite >4A J-3 - foam ...... 2 9 . 9 5 1 9 . 4 8 KPS-18 Servo (Super Mini) . . . 54.95 43.98 MBM 360 M B M 3 1 0 Sureflite Spitfire - fo a m ...... 3 9 . 9 5 2 5 . 9 8 M B M 3 9 0 L.R. Taylor Multi-Charger ...... 2 4 . 9 5 1 9 . 9 8 KPS-14IIA Servo...... 39.95 27.98 MBM 361 M B M 3 1 1 Top Flite 10x6 (12) Super Maple. . . 1 6 . 2 0 1 0 . 5 8 KPS-15IIA Servo...... 42.95 29.98 MBM 362 M B M 3 1 2 Top Flite 11x7 (12) Super Maple . . . 1 8 . 6 0 1 1 . 9 8 M B M 3 1 3 Top Flite Sealing Iro n ...... 1 9 . 9 5 1 3 . 9 8 M B M 3 1 4 Top Flite Heat G un ...... 2 9 . 9 5 1 9 . 9 8 FUTABA FUTABA FUTABA FUTABA FUTABA M B M 3 1 5 Top Flite Freshmen Trainer ...... 4 7 . 9 5 3 0 . 9 8 FP-2GS...... 109.95 71.98 MBM 363 M B M 3 1 6 Top Flite Contender ...... 5 6 . 9 5 3 6 . 9 8 M B M 3 1 7 Top Flite P-51 D M ustang ...... 7 4 . 9 5 4 4 . 9 8 FP-2F w/S-7's...... 149.95 98.98 MBM 364 M 8 M 3 1 8 Top Flite P-40 W arhaw k ...... 7 4 . 9 5 4 4 . 9 8 FP-2F w/S-18's or S-22's...... 134.95 89.98 MBM 365 M 8 M 4 0 7 Lanier Comet II ...... 6 2 . 5 0 3 9 . 9 8 M B M 3 2 0 Top Flite F4U-1A Corsair ...... 9 9 . 9 5 5 9 . 9 8 FP-2E w/S-7's...... 149.95 98.98 MBM 366 M 8 M 3 2 1 Tower RC Long Plugs - 6 plugs .... 8 . 9 4 4 . 6 8 FP-2E w/S-22's...... 134.95 89.98 MBM 367 M B M 3 2 2 Tower 12 v. Starter Battery - wet. . . 2 5 . 9 5 1 2 . 9 8 FP-3S w/S-18's...... 144.95 94.98 MBM 368 M B M 3 2 3 AFI 12v. Battery Charger ...... 1 3 . 9 5 6 . 9 8 M B M 3 2 4 A F I 1 2 V . Gel-Cell Battery 2 6 . 9 5 1 9 . 9 8 FP-3S w/S-20's...... 169.95 109.98 MBM 369 M B M 3 2 5 Tower Rubber Bands V* Lb. No. 64. . 1 . 5 0 .9 8 FP-3FN w/S-18's or S-22's . . . 219.95 139.98 MBM 383 M B M 2 3 0 M RC RTF Cessna w/Enya .35 RC . · 4 4 9 . 9 5 2 7 7 . 4 8 M B M 3 2 9 VK Cherokee ...... 6 9 . 9 5 4 8 . 9 8 FP-4FN w/S-18's...... 289.95 179.98 MBM 370 W e b r a ...... Call For Low Prices FP-4FN w/S-16's...... 319.95 199.98 MBM 371 M B M 3 3 1 Wing Mfg. The Love M achine ...... 4 9 . 9 5 2 7 . 9 8 319.95 204.98 MBM 372 M B M 3 3 3 X-Acto No. 5083 Deluxe Knife Chest 7 . 9 9 5 . 5 8 FP-5FN w/S-18's...... M B M 3 3 4 X-Acto No. 5087 Knife & Tool Chest 2 9 . 9 5 2 0 . 9 8 FP-5FN w/S-16's...... 359.95 222.98 MBM 373 M B M 3 3 6 Zinger Props 9x6 6 each ...... 7 . 8 0 5 . 4 8 FP-6FN w/S-18's...... 339.95 209.98 MBM 374 M B M 3 3 7 Zinger Props 10x6 6 e a ch ...... 8 . 4 0 5 . 8 8 M B M 3 3 8 Zinger Props 11x7 6 e a ch ...... 9 . 6 0 6 . 6 8 FP-6FN w/S-16's...... 369.95 234.98 MBM 375 S-16 Servo...... 39.95 29.98 MBM 378 S-7 Servo...... 39.95 29.98 MBM 379 Remember, these are only a few of the several thousand different items that Tower Hobbies stocks. If you need an item that doesn't appear in this issue, give us a call to see if we have it. The chances are good that we do. By all means compare our prices before you buy elsewhere; you'll SANWA SANWA SANWA SANWA SANWA SANWA be dollars ahead. No.8020 2 Channel...... 99.95 69.98 MBM380 as without. I found that with the engine at full blast, there is a slight tendency for the airplane to turn left. This is due, no doubt, to my using a more powerful Help For The engine than is called for. Right and down thrust appropriate to the engine supplied are built in. From 3/4 throttle on down, flight is straight ahead. The Beginning RC Modeler transition from power to glide is totally SS9S Now there is a book, "Radio Control uneventful. Radio Control Rjdng Flying for the Non-Modeler," that represents A few things mar my total pleasure for The NonyVIocteter a major breakthrough in getting the first with the Sportavia. Some of them may be BVBUKUGIR time builder/flyer off on the right foot. due to my use of slightly heavier gear "Radio Control Flying for the Non- than the designers expected, but the Modeler" is unlike any other "beginner's manual does not warn against the extra book" because it is a step by step do-it- two or three ounces my Sportavia car­ yourself pictorial instruction manual for ries. The plane, unlike the Cox Cen­ turion (the other Cox Ready-to-Fly R/C building and flying the "Performer." This model), has a nasty stall. It does not stall plane was designed for remarkably fool­ straight ahead; it tends to snap to one proof building and flying. It is a totally side or the other, with some hairy unique 72" span .049 powered glider with control stick motions required to save flight characteristics that virtually assure the plane if it is at a low altitude. If it is that the first time modeler will succeed — too low, say goodbye to it. My Sportavia even without the assistance of an expert! was damaged quite heavily (wing brok­ For the first time the non-modeler has en, fuselage cracked apart in many a book that answers virtually all of his get­ places) when I let an experienced flier I ting started building and know try the plane. He stalled at about years in preparation. 20 feet, and that was it. A novice flier I To be sure that it cov­ know found it harder to maintain a ers all of the basics, author, constant heading than the Western Paul Kugler, has had a Wind R/C glider (the plane she is most number of non-modelers read familiar with). the manuscript and build the There is no spare parts list with the "Performer" from scratch. The book instructions for the Sportavia, and I hope was then revised to answer any questions Cox will soon make spare partsavailable. that these beginner's had. The wings are quite flexible, and in The "Performer" can be easily inverted flight they lose their dihedral built from scratch or from the kit and are almost dead straight. In a loop available from Midwest Products Company. Now you the wings curve up quite noticeably. The have a way to get that new RC Flyer into the hobby without wings thus act somewhat as springs in mild turbulence, smoothing the ride. difficulty. The instructions state that you can do an "Radio Control Flying for Non-Modeler" includes full size outside loop with the plane. Since you templates and a detailed list of materials needed for building the "Performer". could hear the wings creaking on inside 7 “ —------— — -r loops, and since the spar is on the ! Please send m e ______copies or Kaaio Control Flying for the | A T BETT ER I Non-Modeler". Enclosed is $6.70 for each copy ordered ($5.95j bottom of the wing, I was quite careful I for each book plus $.75 for postage and handling). to try the outside loop as gingerly as this HOBBY maneuver can be performed. The plane I Total Enclosed ______(U.S. and Canada only) SHOPS OR I made alarming sounds and the wings ORDER I N a m e : ______[ bent the wrong way, but the Sportavia DIRECT! I did the outside loop. The wing showed ■ Street Address: ______| no signs of damage upon landing. The friend of mine (Ralph Voorhees,another City, State, Z IP : ______true sportsman) who crashed the ship \»»M Return to: Boynton & Assoc., Clifton House, Clifton, VA 22024 offered to make the repairs, and we added fiberglass tape to the wing in an effort to make it stiffer. We also took out flight easier. The airfoil, as provided, is over a quarter of mile. I made a wide, two degrees of dihedral, as the plane thick and flat-bottomed. For aerobatics I sweeping turn and it eventually came looks silly and unscalelike with the would have preferred a semi-symmetri­ down in some weeds at the other end of wingtips over the canopy. Also, without cal airfoil. Setting the ailerons up a bit the field. Fantastic! I was prepared for this modification it tends to wallow, has about the same effect. Without the the second glide test, and pretended I much like the scoop-winged Hobie skid, and with the receiver a bit further was flying an intermediate sailplane. (now Midwest) Hawk. There is still back than I would have wished, the Tiny That’s how it glides. plenty of dihedral left after the modifi­ Ace balanced where called for, and flew Before I had a chance to try a powered cations. without any trim changes necessary. flight, I took it to a slope-soaring pylon With the strapping tape and the les­ race to see how it would do. The S.F. sened dihedral the Sportavia is a much FLYING Vultures all agreed that it was a good- better plane. It is easier to keep on a Since the Sportavia is a glider, I looking plane, but a broken connection given heading, and turns smoothly and decided on a hand launch glide test in inside the wiring harness prevented my in a most realistic manner. Loops are the sloping 95-acre field behind my flying it at the contest. cleaner and sustained inverted flight no house. I aimed for a point on the ground After the contest (I came in third by longer brings gasps from the crowd as about 50 feet away and gave it a gentle borrowing Rich Pearsall's plane . . . the wings no longer bend like Alice in toss. Without a touch on the stick, it flew there’s a sportsman for you), I took the W onderland’s flam ingo. The wing- off, level and flat. To my surprise, it went Sportavia home and soldered the con­ creaking is gone and, as I said, the plane up a few feet, and proceeded to glide for nection. It flew as nicely with the engine is much more pleasing to look at. The

84 R/C MODEL BUILDER bad stalling characteristics are still there. I called up Cox about this, and they admitted that their engineering ' sample had the same problem, and was DU-BRO PLATED BRASS sitting on someone’s workbench in pieces. One last hint: Remove three of DURA-COLLARS the four wheels. First remove the out­ board wheels. On anything but smooth ENOUGH STOCK SO THAT THREADS WILL NOT STRIP CAN BE RE WORKED FOR pavement they just cause groundloops OTHER USES - NOT LIKE HARDENED STEEL A NICE IMPROVEMENT THAT HAS ALWAYS BEEN THERE STILL AVAILABLE IN SETS OF 4. COMPLETE WITH ALLEN or tear themselves out of the wing. My WRENCH. FOR MODELERS WHO DEMAND ONLY THE VERY friend filled the holes with epoxy and microballoons. I also recommend re­ moving the tail wheel. Since there is but one central wheel, the plane tends to rotate (in yaw) causing the tailwheel to skid and pull the back of the fuselage apart. Removing the tailwheel helps. Perfect pilots who always land on glass- smooth runways may ignore this advice. Flying the Tiny Ace is the most aero­ batic fun I've ever had with a half-A plane. I set up the ailerons with differ­ ential throw (more up than down) by motor bending the linkage wires forward a bit. This also allows them to clear the rear FLBGCABLE control rubber band peg. (I keep on getting the CAT. NO. feeling that nobody tried out this plane 165 after it was kitted.) Axial rolls, even though I don’t have a 20 ASSEMBLY lot of practice doing them, are quite ONLY $1.49 easy, requiring only a bit of down NO SHRINK . . . NO STRETCH . . . elevator once the plane is sideways. FREE RUNNING . . . MICRO ADJUSTABLE Inside and outside loops and extended GREAT STRENGTH . . . QUICK, EFFICIENT INSTALLATION PROCEDURE . . HOT HUMID OR periods of inverted flight (even climbing COLD DAYS DO NOT AFFECT THROTTLE SETTING . inverted flight) are possible. It is very THE FINEST R/C ENGINE CONTROL CABLE ASSEMBLY AVAILABLeT- easy to stall the plane inverted, but recovery is easy. The weight, which I had feared at first, was no problem at all, and the momentum afforded by it allows n y l o n HINGES showy tricks like vertical rolls. The Tiny THE FINEST HIGH PERFORMANCE RC AIRCRAFT HINGE AVAILABLE Ace requires your attention every sec­ ond. It is not stable. There is no hands- PRECISION MOLDED . . TABS ARE EMBOSSED TO off flying. I suspect a less experienced ASSURE A "FAIL SAFE” BOND IN THE RECEIVING pilot could set it up a bit nose-heavy and SLOTS . . . .031 TAB THICKNESS FOR GREATER fly it with a tad of up-elevator trimmed STIFFNESS AND LONGER LIFE . . . STEEL in. It would be a tamer beast under those HINGE PIN FIRMLY LOCKED IN PLACE . conditions. It is also more gentle if you INSTALL DU-BRO HINGES AND YOU start without the up-ailerons (orshould I KNOW YOU WILL HAVE THE VERY say up-flaps). BEST No. 116 ( Beach) $1.10 / MINI \ No. 118 $1 00 In learning aerobatics, there are No. 117 (15 each) $ 2.49 V. SIZE ) No. 119 $1 95 always a few hard landings, and the Tiny Ace has shown its mettle in that regard. It is very strong. After a dozen flights, I KWIKHINGE removed the main landing gear. It lands better in the tall weeds now. All the wheels do is catch in a thistle and dump SLOTTED the engine in the dust. It also seems to FOR LARGE ANO SMALL HINGES. "groove” through maneuvers more THE ONLY UNIVERSAL SLOTTING easily without the wheels. TOOL THAT NOT ONLY CENTERS, BUT GUIDES YOUR BLADE FOR As a matter of taste, I (and most of my PERFECTLY ALIGNED HINGE friends) don't think that it is a very good- SLOTS EVERY TIME! looking airplane. But a lot of them wish The black oxided, hardened steel that they had one that flew as well. blades lit neatly In a no. 2 x-acto SUMMARY knife handle and work In conjunction with our handy alignment jig that In the Almost-Ready-To-Fly arena, features 3 Interchangeable snap-on both these planes are standouts. The guides Two for large and small leaf Cox Sportavia is very quick to get in the hinges, and one for drilling 3 stan­ air, and provides a good-looking and dard size holes to match any type of pretty capable powered glider. It needs hinge you choose to use. a bit of beefing-up, and has treacherous slow-speed stall. The Pilot Tiny Ace takes only $1.95 Cat. No. 216 quite a bit of construction (compared to the Cox kits) and is a very sturdy and aerobatically capable. You can fly it on ■DU-BRO PRODUCTS1 relatively windy days. INCORPORATED Take both these planes to the field 4ΘΟ Bonner Road Wauconda. Illinois 6ΟΟΘ4 U.S.A when you go to fly and you are ready for

AUGUST 1979 85 r ^ published quietly by Model Builder in April, 1977, which then proceeded to break two minutes easily on test flights! When you think retracts... Mik Mikkelson followed the glory boys home in 3rd spot with a nifty Gollywock, which gained an incredible amount of dihedral in flight to post a 1:42. M ulli­ THINK gan's 2:31 was unsurpassed for the day. Warner posted a 41-second flight with the ornithopter, while the most historic model there. Bill Hannan’s Penaud "Planophore,’’ was proxy-flow n by R O M A m Curtiss Mooney to an incredible 56 seconds! The real “ Planophore,” one of the first, if not the first rubber models ever flown, would have been proud to see that. Construction ranged from 4-gram Dl (indoor wood and condenser tissue) to 12-gram outdoor style with 1/16 square and Japanese tissue. It will be interesting * STANDARD MAINS * FLAT MOUNTSD R.v«rslbl*-lnboard or outboard cylinder! NOSS GEAR to see the direction this event takes. Hopefully it will not be in the direction of the AMA rulebook! ·

Hannan...... Continued from page 58 WRIGHTS TO WIDE-BODIES From the Air Transport Association of America's publication we have ab­ stracted the following, written by Robert ). Serling, well-known aviation writer and brother of the late Rod Serling: "The progress in air transportation since the blustery day of December 17,1903, at Kitty Hawk, North Carolina, can be summed up in this single comparison: You could easily duplicate the entire length of that historic flight inside the cabin (italics ours) of a modern jetliner and still have room to spare.” The article goes on to point out that today, 23 of every 24 people travelling between the U.S. and Europe go by aircraft. Perhaps more startling is the fact HAND VALVE COLOR CODED HOOK UP TURING that jetliners are traversing the Atlantic at the rate of one every fifteen minutes! OTHER MODELS AVAILABLE: THE AEROPLANE •ř.A .I. MAINS Cylindir Outboard — Not Rovortiblo That’s the name of a 1911 book written MAINS tor PIATT FW 190-D9 - with 3/16" Praformad W ir· 90 ROTATION MAINS for P-40 Tomahawk or HU Cortair by pioneer British aviator Claude •HEAVY 3 /1 6 " STRUTS on »podal ardor only. Graham-White and Harry Harper, with contributions added by other early

_ V R O M AIR-CHOICE OF CHAMPIONS fliers. Filled with conjecture, it makes intriguing reading now. Jim Daugherty, ΗΗΠΜ © RHDM PRODUCTS MANUFACTURING CDRP. of Winged Victory Scale Aeronautics, was kind enough to send abstracts, such 924 65th Street, Brooklyn, New York 11219 as following, from A.V. Roe (AVRO): "The triplane lends itself particularly well to safety, for should any one wire or anything. After a 10-minute flight, all 1:42. George lames’ 1:30 flight with his bolt give away among the main-planes, tension and knees shaking (this is caused Korda Victory was upstaged by his Red there is always another to take up its by attempting repeated inverted passes Zephyr, which may have done only 55 work. Each part of the aeroplane is at 5 feet altitude), relax with a 20-minute seconds but was cute as a gnat's wrist- independant of any other, whilst each flight gracefully soaring in the domain of watch. Dick Baxter and Mike Mulligan portion helps to support the remainder. the eagles. With this pair, who needsfull both broke a minute with scale jobs, In this way much of the aeroplane has to house? · Dick’s Ideal Taube at 1:17 and Mike’s be broken before the machine col­ Megow Cessna at 1:02. Joe Bailey and lapses." A.I.R.-XX ... Continued from page63 Lonnie Cope both had Korda Victories, FIRE though to slightly different scales. The almost total loss of the San Diego a Sparky, was impressive enough, Mar­ Chuck Conover’s Flying Yankee and Bill AeroSpace Museum by fire last year had lon Albert’s “ Triangle” was equally so Warner's Cleveland “ Polish Valor” a sobering effect on many of our readers. with a 34-second flight, as its potential is helped push the event also . .. from the Quite a number have sent in donations much less. Walt and Curt Mooney’s bottom! Oh well, can’t win ’em all. or aviation memorabilia to assist the Pacific Aces seemed ideal choices for In stick, a secret weapon was sprung rebuilding cause. Others offered practi­ someone who wants to get going in the by Mike Mulligan and Lonnie Cope, cal suggestions toward safeguarding event, both flying exceptionally well, who both showed up at the party with existing collections. with the Ό Ι Professor knocking down Cloud Chasers, a little twin-tailed gem J.D. Schaffner feels that microfilming

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AUGUST I979 87 The Minimousetan^ is designed lor two channel ENGINE SIZE: 049 radio control operation with a % A motor. MINIMOUSETANG The 35 inch wing span combined with approximately BY KEN WILLARD 15 ounce flying weight gives a wing loading of 9.2 The Mmin>ousetang is a sport airplane designed by ounces per square foot The kit features quality ma­ Ken Willard with Kit engineering by Model Engineer­ terials. rolled plans, building instructions, complete FLYING WEIGHT: 15 OZ. ing of Norwalk hardware package, canopy, and pre-shaped landing gear The building time for the Mimmousetang is 7 to This quick building, fun flying plane will put you at 14 hours ease on the ground and in the air With a Cox QRC motor this plane can easily be flown in areas where The following items are needed to finish the model noise and size would not have permitted you to fly radio, motor, tank, covering material, glue, i %” main before. wheel. tail wheel. */„ collars. collars, and motor mounting bolts. Model Engineering of Norwalk's "THRU-CUT" die cutting, combined with TRI-SQ UARE-LOC' as­ sembly in lite plywood and balsa makes construction simple enough for the beginner The inherent strength of our lite ply construction provides durability and lasting performance. You will be spending more time on the flying field and less at MEN the repair bench. Model Engineering of Norwalk TRI-SQUARE-LOC enables us to bring you the best 54 Chestnul Hill · Norwalk Connecticut 06851 in hte plywood construction. This method of squar­ ing. straightening and holding parts in relation to one DřAltn ANO OlSTReuTOfl (NOuMCS INVtTEO another revolutionizes construction WING SPAN: 35

INTRODUCING THE NEW M.E.N. RC $ 5 3 .« BUZZARD BOMBSHELL M.E.N.'s re-creation of a classic old timer free flight, Wing Span 72" strengthened and modified for RC, meets the Society of Antique Modelers requirements for RC Old Time Competition. \T , τ Λ »-«1 9 0 1 52% in May be flown Free Flight, Rudder Only, Rudder/Eleva- tor, Rudder/Elevator/Throttle. ■) Weight with > 3 Channel Radio. MEN. m 3 Lbs. to 3 Lbs. 12 Oz. ------Engine .25- 40 Glow 4S-.60 Ignlllon Model Engineering of Norwalk (1975 S.A.M. Competition flutes ,361Glow Mai.;

OtALÍ R ANO OISTReUTOR MOURCS INVITED \ It not availaď*· at your d M k r. order direct. § Conn rwktont* add your Uul important documentation may provide seems only to have added confusion to was the big attraction in "playing with the best security, since so little space is an already much misunderstood subject. toy trains." The answers were as varied required for storage in a fireproof vault. The result is much frustration for model as they weredelightful: Pam Fitzpatricks: He states that the U.S. Air Force offers builders. Ideally, such a story would be "I don’t know why. Maybe we’re daft." microfilm copies of WW-II history, based upon comprehensive tests, would Angus Wallace, who runs full-size diesel including aviation, for sale. These may name brands, discuss actual chemical trains for a living: "Well, I dunno. But be read on equipment available at many compositions, explain advantages, dis­ these work better than some of the libraries. Schaffner suggests that micro­ advantages (including possible toxicity things I am given to drive.” Nigel films of old magazines, such as Flying problems), and explain WHY some McMillan: "I doit because I have done it Aces and Air Trails, would find a ready products are or are not compatible with since I was five. Also it is a craft. People market, if anyone cared to offer them. others. don’t make things anymore.” George Chaulet asks how many Some years ago, "V on D utch,” a Hunter then offers his own interpreta­ model builders have a fire extinguisher famous Los Angeles automobile painter tion: "The enthusiasm (this is my guess) located near their own book and maga­ and striper of great talent, explained that has also something to do with escape. It zine collections? Probably very few, we in spite of all his years of experience, he is a way off this super-atomic techno­ suspect. Yet, such units are relatively still could not really claim to understand logical world in which, despite all the inexpensive and readily available. The why sometimes paint jobs would turn wizard machinery and whiz-kiddery, cost might be about the same as a single out well and other times fail miserably. things just don’t work anymore . . . in an high-quality reference book. Think of Our guess is that someone in this audi­ age when hardly anything works, it having to replace YOUR archives! ence is qualified to provide the answers satisfies some basic emotion and, maybe, ARTICLE IDEA in an understandable manner! a sense of the need to survive to restore Any authors out there looking for a WIT AND WISDOM FROM SCOTLAND things which used to work well.” way to while way an excess of spare Doug Gillies favored us with two ALONG SIMILAR LINES time? Here's an idea for you. Back in articles from the Glasgow Herald, au­ From the United Kingdom publica­ May of 1970, Connie Stine published a thored by William hunter. The first tion MODEL RAILWAYS, for )uly, 1978, most informative writeup about paint contained this gem: It seems that a BEA we have abstracted some comments by compatibility. She tested very logically Rapide pilot once boarded his plane Stuart Kine, which would seem equally the many possible combinations of wearing "civvies" rather than his uni­ applicable to any form of scale model­ paints and their effects upon each other. form, and sat down in a passenger seat ing. After reflecting upon a remark “ If a Included were enamels, dopes, lac­ with the others. After a time when model isn’t 100 percent scratch-built, it quers, and other which were employed nothing continued to happen, he is no good,” Hine reacts thusly: " .. . on model rockets. climbed behind the controls, growling There are only two criteria on which the We think the subject could be ex­ that he "would drive the bloody thing ‘goodness' of a model can be judged: panded and updated to include epoxies, myself.” This actually happened, during how closely it resembles the prototype acrylics, water colors, etc., to remove 1946. and how well it works. If it satisfies both much of the mystery that still seems to Hunter also devoted attention to the these requirements, I can’t see that it surround this very basic yet complex rebirth of interest in model railroading, matters whether it was assembled from a type of product. Manufacturer’s hype and asked a few Scottish modelers what kit or carved out of a solid block of 88 R/C MODEL BUILDER tungsten carbide. If your mind works that way . .. and I must admit mine tends to . . . there is more satisfaction in doing it all yourself, but this is a thing personal to the builder and has no bearing on the model’s intrinsic goodness.” H P ENGINES TEXAS PEANUTS HIRTENBERGER — AUSTRIA Travelling Dave Linstrum, scribe of MAN’S VTO column, alerted us to a poster published by Texas International Airlines. Depicted is a squadron of ten HP120 GOLD CUP POWERTWIN "jet planes", each featuring a hu­ manized peanut (the edible kind) for its fuselage. BUZZER LOENING Genial Ed Toner, proprietor of Bu zer Model Airplane Co., 52 Newbury R >ad, Howell, NJ 07731, has just released a fine new plan for the Loening "Shoeh »rn” amphibian. Desigh°d by spoked-vs ieel manufacturer Fulton Hungerford the prototype model easily .von its class at Lake Elsinore during a Fl'ghtmaster R.O.W. meet some years ago. The land­ ing gear is manually retractable to permit simple conversion from water­ borne to landplane version. The excep­ tionally clean drawing was inked by Ray Borden and manages to present a fairly complex design in uncluttered fashion. Although the original model was rubber driven, it would also be adaptable to End those big engine vibration problems with the smooth running HP120 power- CO2, glow or diesel operation for free twin. The perfect engine for 1 /4 scale airplanes or a tournament of champions scale flight, or possibly "Schoolyard” R/C use. aerobatic design. Marine version ideal for the new giant scale unlimited hydros or Just $4.50 will get you a set of these plans, maximum performance racing boats. The powertwin uses the widely acclaimed gold cup 61 major components (schneurle or send a stamped envelope for the porting, chromed sleeve, dykes ring). Engine is of an alternate firing type with a complete list of other Buzzer offerings. single HP automix throttle. Crankcases can be reversed so that the exhaust loca­ FOAM FINDS FORM tions can be fixed for proper exhaust manifold locations. Gear reduction units, (FUNCTION FOLLOWS FOAM?) special exhaust manifolds, tuned pipe, motor mount, will be available soon. One of our photos this month shows SPECIFICATIONS Bill Noonan’s approach to developing Displacement 19.8ccm(1.20cu. in.) bulkheads for his flying scale models. Weight 970 grams (34 Vi oz.) Since many 3-view drawings do not Length 6-3/8 in. depict fuselage cross-sections, one is left RPM Range 1800 to 14000 to his own devices to arrive at various Horsepower 3.13 station contours. Plotting them on paper Suggested list price $350 is a chancy business at best. With (Sotcrfkcattorm subject to ctwnQ· without note· 0*ow cfegs not tnciudw)) Noonan’s technique, a half-model of the fuselage is cut from styrofoam and Available at your favohte dealer carefully shaped, using photographs of the prototype as guides to the correct MIDWEST MODEL appearance. Bulkhead locations are selected as dictated by spar and strut SUPPLY CO. attachment convenience for the model. The styrofoam half-model is then cut at NspenHIle Dr. ■ Ronieovlllg. IL 60441 · (312) 75S-19S5 these stations, and cardboard templates V. traced at each position. Then a right and left balsa former is made from each template. exuberance here (with hand-held paper) Floats for this particular model, a C/L ...... Continued from page 57 will show up later. Curtiss 18-T-1, were plotted in the same Finally, you are about ready to paint manner. Summing up the idea, Bill says: all gone, leaving only the little pits and the thing. Arrange some way to securely " I can’t imagine any better way of stuff filled. The primer is not meant to fill hold the model, yet be able to either making accurate formers, without a lot in big stuff, just the little ones. If you maneuver completely around it or to of cursing and fuming.” still have low spots and so on, it is once turn the model itself. SILLY SIGN-OFF more time for making the Big Decision. Mix up the paint, and while it is sitting, It seems that two air cargoliners were At least the primer coat shows you what wipe the model down with a lint-free rag passing over a desolate section of the the color will later on. lightly soaked in thinner. I still see South Pacific ocean. One was transpor­ With everything going OK so far, I articles suggesting you use a tack-rag to ting a large quantity of red paint, while spray on a last coat of primer and put it wipe thingsoff with, but don’t. The usual the other had a similar load of purple on fairly lightly. Decent coverage, but tack-rag seems to leave junk on the pigment. Unfortunately they collided in not much more. surface, junk that comes off the tack-rag mid-air, and while both crews para­ A good eye-balling session is next, itself. It is also possible to vacuum the chuted to safety, they were all marooned more block sanding, although at this model to get rid of lint, but in my shop, on an island. · stage I will sometimes cheat a bit by wet- the vacuum generally stirs up more dust sanding with used 600 wet-or-dry paper than it picks up. No matter the method, very lightly held in my hand. Any over­ just get that sucker spotless.

AUGUST I979 89 weight. A definite no-no. With the two color coats being ap­ This is our shipping plied back-to-back being so important, I have always finished a couple of large clerk, Ed. He is fa ste r scraps of wood right along with the than he looks. Fact is, model itself. Each step is also done to the scraps. When it comes time to actually all of the RADIO lay on paint, the scraps are painted first. SOUTH Team are In this way, a surface identical to that being painted can be used to test for pretty fast. So if you possible runs, orange peel.and so on. want fast turn-a­ With the model painted, it should be allowed to dry thoroughly. Many think round on your R/C that epoxy is dry after a day or so, and it repairs and orders call does feel dry, but it has not yet devel­ oped a hard surafce. Wet-sand a day-old on RADIO SOUTH and epoxy finish wfth 600 or 800 paper and watch Ole Ed jump! you’ll see what I mean. Only a fiend at rubbing-out paint, or a coat of clear, will bring back the gloss. ‘At RADIO SOUTH Customer satisfaction I personally do not like the “ wet look” you can get with epoxy paints, as it looks isn’t just a motto, it’s our way of life.” too “ plastic.” So I let the model dry for a week or so and then wet-sand with 600 We provide fast economical in-house service on all or 800 wet-or-dry paper. The model is radios and engines we sell. Our list of satisfied cus­ completely cleaned and any trim masked tomers reads like a “who’s who” of R /C competi­ off and sprayed. This too is wet-sanded. tion. Call Steve Helms, our resident R/C expert for A coat of clear is then applied, again using the one-shot, two-coat method. his advice before you buy your new equipment, or The clear is let dry for at least four days call Steve to discuss any problems you are having and then it is wet-sanded with used 800 with your present equipment. He’ll be glad to help. wet-or-dry paper. The (almost) final step is to get the paint rubbed out. I imagine any good Special of the Month from Southern R/C grade of very fine rubbing compound The EZ FLYER — a fabulous EZ works OK, but I use the DuPont white to build and EZ to fly Trainer. stuff. It is difficult to carry this step too far, so don't be afraid to get every square inch rubbed out. Depending upon the future use of the model, it can be waxed. A stunt plane shouldn't be seeing much high nitro fuel, so a good quality wax is fine. On a racer subjected to nasty brews, some­ thing more is required. Truck on down to your local Speed Shop (hopefully you know the difference between them and the garden variety auto parts stores) and .40 - .46 engine, 54" span, 600 sq. ir ask for some of the wax used on nitro- And remember for fast reliable radio repairs burners. If you don't know what a “ nitro-burner" is, you don’t deserve to RADIO SOUTH IS THE CHOICE OF THE PROS ... TRY US! get the wax. Although I have never tried it, most of SOUTHERN R/C PRODUCTS. INC. these shops also stock a clear paint that is used on fuelers to protect that trick paint RT 3 - BOX 47 NIMS LANE. PENSACOLA, FL 32503 from raw nitro and its fumes. You might * PHONE: (904) 477-3974 try it, there should be no problems with spraying it right over any epoxy finish. . . When spraying epoxy (the only really back and hit it again before moving on try it on a scrap first, though. suitable way to apply it), I have found to the next area of the model. The paint While in the Speed Shop, you might that the one-shot method works best. In will still be wet, so the touch-up shot will ask about nitro, as many of them sell it. other words, do it all in one sitting. flow and not show later. Nitro is kinda scarce right now, you Starting someplace logical, spray the This second coat is critical. Missing a know... · model with a light coat. You need not spot means coming back a day or so get complete coverage with this coat, later, shooting it again and then trying to Choppers.... Continued on page 17 but do get the material on as uniformly get the overspray sanded off the rest of as possible. As soon as the entire model the model. Too heavy a coat means runs, bearing unit with screws and bushings is covered with the first coat, immediate­ which are difficult to get rid of without (No. 3038C). ly go back to your starting point and do it resorting to block sanding and a com­ MISCELLANEOUS NOTES all over again. This coat has to go on plete redo of the particular panel. Well now, that was quite a bundle of heavier, both to get complete coverage Another reason for taking a lot of care goodies for the Jet Ranger and Alouette and to get that nice glossy finish. with the second coat is that if you mess it 2 owners, wasn’t it? Actually, I've only Again, the constant use of the strong up, you will probably sand the whole scratched the surface, there being light is suggested. By looking across thing again and almost start over fresh dozens of other items we won’t have each panel as you spray it is easy to see with the color coat. What you end up room to talk about in this issue. I would, the spray pattern and the surface you are with is a model that has been painted however, like to pass on a few observa- painting. If a spot is missed, you can go twice with an acompanying increase in • Continued on page 94

90 R/C MODEL BUILDER SYSTEMS FEATURE • SMOOTH OPEN GIMBAL ACTION WITH CLOSED DUST COVER SHIELDS RADIO CONTROL SYSTEMS • TRIPLE TUNED FRONT END RECEIVERS • ACCESSORY PACKAGE WITH TRAYS AND EXTRA WHEELS OR ARMS

DEPENDABILITY 6 SERVO CHOICES SMOOTH STICK OPERATION TRIPLE TUNED RECEIVER

Aero Sport Three Systems Include 3 channel Aero Sport Four Systems Include: 4 channel Aero Sport Six Systems Include: & channel Aero Sport Two Systems Include: 2 channel receiver, 4 channel transmitter, all Ni-Cads tor receiver, 2 channel transmitter, both for AA receiver. 3 channel transmitter, both for AA receiver, t channel transmitter, all Ni-Cads for Alkaline battery operation (battenes not in­ Alkaline battery operation (batteries not in­ both tram m itter and receiver airborne, dual both transm itter A receiver airborne, dual charg charger (charges both batteries at the same cluded).? Aero SportNS-IC servos, dry airborne cluded)^ Aero SportNS-IC servos, dry airborne er (charges both sets of batteries at the same battery box, switch harness, frequency flag, ex­ battery box. switch harness, frequency flag, time),4 Aero Sport NS-IC servos, servo tray, ex­ time), 4 Aero Sport NS-IC servos, servo trays, tra servo wheels and full ISO day warranty. servo trays and full 1 ·0 day warranty. Choice tra servo wheels, instruction book, frequency extra servo wneeis. instruction book, frequency 72 mHz only. of 72 or 75 mHi flag and full 1 ·0 day warranty. 72 mHz only. flag and full 1·0 day warranty. 72 m Hi only.

Hobby Shack takes particular pleasure in lowing you a choice of six different types to best knowing that we are offering the American modeler suit your needs. In fact all systems are shown in the the finest line up of radio systems and accessories at catalog with several servo options for the initial pur: real money saving economical prices. For the past chase. This year we have introduced our brand new seven years we have been contracting for our radio stick assembly giving you open gimbal action with a systems to be manufactured by the largest and best dust shield to keep the dirt out. When you select an radio maker in Japan. This has allowed us to keep Aero Sport System you're getting quality, dependa­ pace with the new electronic technology and get bility, up to date engineering design, and back up ser­ quality craftsmanship. For 1979 we have four sys­ vice and warrenty. That's the reason we have always tems, giving you a choice of four radios to choose sold so many radio systems each year and know that from, depending upon your needs and progression we have the best for 1979. in the radio control hobby. No one else that we know of as of this writing has a better two channel to offer you than our Aero Sport Two. Our two channel transmitter is an aluminum vinyl covered case unlike ail the other plastic cases. Only Aero Sport Two offers a triple tuned front end receiver the same as our other radio systems have. Only the Aero Sport Two offers you three servo types to select from when you make your purchase. We think the Aero Sport Two is the best two chan­ nel you can buy at any price and our price is only $79.99. This year we have expanded our servos al­ EMPKE MODELS AN EMPIRE EXCLUSIVE! MIDWEST CONTROL LINE PRICES SLASHED! -Length: 36 in. Bushwacker w/o access 35.25 -Beam: 5.5in. FULLER ENTERPRISES 215 Magician 15 8.75 tfcOS Wanderer 15.69 -Sponson to Sponson: 16 in. 235 Magician 35 12.49 Sunny 25.80 ■ Weight: (Unfinished) 3.5 lbs. OUTRIGGER 40 236 King Cobra 35 14.95 WindtreeRTC 107.61 237 Mustang 35 14.95 9 4 6 Wanderer RTC 53.77 ■ Adjustable Rear Sponsons Trainer 40 RTC 78.29 E.D. TUNED PIPES #1 (15-20) 17.25 MIDWEST #2 (29-40) 18.65 106 Tri Squire 21.50 #3 Quiet (40-60) 21.75 109 Lil Tri Squire 15.49 122 Das Lil Stik 22.25 FOX ENGINES 125 Cessna Cardinal 21.95 116Ó0 15 Schn 19.56 126 Super Chipmunk 21.95 21600 15 SchnR/C 26.56 128 Sweet Stik 27.95 21900 19 R/C 25.86 129 Cardinal Squire 57.49 22500 25 R/C 21.60 130 Sinke Master 49.75 ASTRO FLIGHT 13500 35 Stunt 19.56 131 Pills Special 71.75 KITS 13600 36 19.56 27.95 $69.95 13700 36 BB Combat 34.96 134 Attacker ASW-17 Sailplane 62.75 Love Machine 32.95 Monterey Sailplane 31.75 23600 36 R/C 25.86 AXIFLO40 35.95 Electra-Fly 17.75 24500 45 R /C Schn 36.35 26099 60 BB Eagle R/C 48.95 AXIFLO049 29.50 Californian 51.75 Easy Flyer DUMAS Sail Boats 60 Trainer 60.75 ACCESSORIES Hfemket He-162 53.95 Std Hi-Start 26.25 Hobie Cat 8.45 Fox Tanks Wheels All in Stock Alcort Sun Fish 14.89 Multlers 25% 0(1 List HD Hi-Start 29.95 30 Star Class 36.75 SIG Astro-10 System 54.75 86.25 Kadet 27.68 45 Star Class GOLDBERG 35.60 Astro-15 System 66.75 Bingo 50/800 Fiberglass 195.00 Ranger 42 ARF 19-16 Kougar Astro-25 System 74.75 219 Lightning 15.75 Komander 30.50 Falcon 56 II 34.95 Crtabra 45 9H •NEW' DumasHuson 121.50 Sr Falcon 44.75 Chipmunk R'C 47.52 163.95 Jr Falcon 9.55 AIRTRONICS Etchells 50/800 J-3 Cub 30.50 Q-Tee 20.09 East Coast 12 Meter •N E W * SKYLARK 56 II 34.95 Clipped Wing Cub 30.50 Square Soar 22.75 Fiberglass 195.00 Jr Skylark 11.95 Smith Mini Plane 39 60 Gere Sport 36.55 Probar Sail Unit 40.50 Skylane 62 44,75 Doubler It 19.80 Questor 31.95 Super Sport 15.84 Aquila St 63.95 Dumas Hardware 25% Oft HUGHEY BOATS Liberty Sport 50.50 Currenl List 20 Rigger 84.95 22.18 Olympic II 45.75 40 Rigger 92.50 Sig Mmow Acro-Star 82.49 Cessna 150 5S 44 DUMAS Scale 19 Hydro 66.75 Mustang Slunler U/C 22.18 PT-109 29.85 BATTERIES Coast Guard Lifeboat 43.15 INTERNATIONAL PIPES STEVE MUCK Nicads Tuna Clipper 35.25 501 (15) 14.95 North Wind 40/60 Mono 44.95 I 25 V 2 Amp 1.98 Lillie Shelley Foss 32.00 36.75 58.85 503 (19-21) 16.50 Lit Lightning 21 O B 1.25V 4 Amp 2.95 Shelley Foss 507 (40) 17.25 Bushwhacker 20 Hydro 82.50 I 25 V AA 500 MAmp 1.75 Goasl Guard 40' Ulilily 34.50 Lit Northwind 20 Mono 42.75 Sealed Lead Dauntless 56.25 509 (45) 18.25 511 (61-71) 19.25 12 Volt 1 9 Amp 14.95 ★ NEW * USCG 44· SURE FLITE MODELS Lifeboat 74.95 J-3 Cub ARF 28.50 * NEW * American Soilfire ARF 28.50 BRIDI Enterprise 56.25 67Πβ19 26.95 84.49 T-10 Trainer 18.75 6712 19 R/C 33.75 7' Citabria T-20 Trainer 29 95 84503.5 F Rotor 41.75 Bird Dog 44.95 RCM Trainer 40 37.49 8384 3.5 cc Inboard 54.95 RCM Trainer 60 44.95 DUMAS Hydro & Deep Vee 8382 3.5 cc Outboard 79.95 TOP FLIGHT MODELS RCM 15-500 29.95 AVL-1 Atlas Van Lines 8.65 8600 5.8cc FF Racing 69.65 P-51 Mustang 63.75 RCM Sportster 29.95 AVL-40 Allas Van Lines 40 41.65 8380 3.5CC R/C 48.50 P-40 Warhawk 83.75 Super Kaos 40 39.31 Pay n Pak 29.85 P-39 Aircobra 63.75 Super Kaos 60 52.49 Hoi Shot Tunnel Hull 24.00 8011 40 R/C 42.25 P-47 Thunderbolt 81.55 Shrike Commander 138.95 U-76 Hydro 39.35 8360 40 R/C Pump 60.49 SE-5A 63.75 Dirty Birdy 40 44.25 DV-20CF Deep Vee 20 9040 40 RSII Marine 72.95 School Master 12.75 P-51 Mustang 97.49 6525 61 R/C 57.49 Competition Fiberglass 60.00 Freshman Trainer 38.55 T-6 Texan 97.49 DV-40CF Deep Vee 40 6535 61 R/C Pumper 74.25 Quickest 500 29.95 Compelilion Fiberglass 71.25 BATTERIES GALORE! RCM Basic Trainer 29.95 DV-60CF Deep Vee 60 LANIER 1.25 Volt Nl Cads Dirtv Birdy 63.75 Competition Fiberglass 75.00 Comet II 43.95 Soar Birdy 13.50 DV-10 Mahogany 8.65 Cessna 34.85 Deep Vee 21 33.75 Pinto 34.85 PICA Atlas Van Lines U-1 37.50 Jester II 55.15 RC-2T-28B 69.95 Hot Shot 21 Glass 52.50 S RC-3FW190 69.95 ★ NEW* DV-10 Glass 16.65 MARKS MODELS RC-4 WACO F-3 69.95 ★ NEW * Li'l Rascal 18.75 Windward 72 25.80 4 , 1 RC-5 Duellist 72.95 ★ NEW * Quickee 40 29.95 Wmdlree99 35.25 AA-500 MAmp 2 Amp 4 Amp RC-6 Cessna 182 72.95 1.75 1.98 2.95 II WHITE SILK 36 12 Volt Sealed Lead 1.9 Amp 14.95 WIDE $2.95 per yard Want anything you don't see — call us! CALL (602) 881-1257 FOR IMMEDIATE SHIPMENTS. DEPT D P. O. BOX 42287/TUCSON, ARIZONA/85733

POSTAGE AND HANDLING and insurance orders up to $5 0U add 95. $5 01 to (a) C O D within 48 continental states only $10 00 add $1 50 510 01 to $20 00 add $1 95. $20 01 to $30 00 add $2 50. $30 01 Please add $3 00 to $40 00 add $2 95. $40 01 to $50 00 add $3 50. $50 01 to $80 00 add $3 95. over (b) Outside 48 Continental States add$15.00for actual $80 01 add $4 50 Send money order or certified check for fast service A P O s postage and handling, excess will be refunded welcome Export welcome Prices subject to change, some quantities limited Note Arizona residents add 4 % sale s tax some of the larger fiberglass kits are sent freight collect best way available Reserve (c) BankAmericard/Visa and Mastercharge welcome the right to dear checks NEW! DUMAS LIL RASCAL $18.75 K&B MARINE PARTS ED Tuned/Blown R/C Pipes 1032 .40 Outdrive Dbl Rudder _ 28.85

DUMAS SPEED $18.75 #1 #2 #2Q #3 CONTROL FOR 7.25 18.65 18.95 18.50 6 OR 12 VOLT MOTOR

Special of the Month 16.50

K&B

3.5 MIDWEST MRCTURBO OUTBOARD OUTDRIVE $47.95 ATTACKER MRC WATERPROOF $79.95 30% OFFI RADIO BOX $15.96 1009 Master M otor Mount 6.60

SUREFLITE L-19 BIRD DO G PUMAS AMERICAN $44.95 $56.25 ENTERPRISE 1010 Insert Adapter (.40) 4.95 1011 Insert Adapter (.60) 4.95 Powerful 6 Volt Motor 1023 Safety Shear Hi-Torque - Perfect for Rudder (.40) 10.65 Boats . . . $30.00 value 1024 Safety Shear Rudder (.60) 10.65 $14.95 1034 .40 Outdrive W/Shear Rudder (Single) 25.50 1000 Double Skeg (.40) 3.30 1001 Double Skeg (.60) 3.30 DUMAS Complete Line in Stock! SCALE BRONZE PROPS OCTURA MODELS 15 Flywheel (Steel) 3.87 DUMAS $69.95 15 Flywheel (Aluminum) 3.87 USCG 44 LIFEBOAT .30 Flywheel (Steel) 4.14 .45 Flywheel (Steel) 4.68 .45 Flywheel (Aluminum) 4.68 DUMAS NEW! .60 Flywheel (Steel) 5.36 INTERNATIONAL SHORT STUFF Slant .40 Eng. Mount 4.68 TUNED PIPES $16.85 Slant .60 Eng. Mount 5.63 FIBERGLASS PICA $71.95 6-60 V-Type Mount 7.02 Kool Klamp Size 0-14 5.18 C E SSN A 182 Competition Props All Sizes Available J.G. BOAT PROPS ROAD RUNNER MARINE ENGINE SIZE . 150 cable 1.00 per It. PROP MONO HYDRO PRICE ,1 3 0c a b le .95 per It. A-7 19 — 4.20 .186 cab le tor C-7 19 — 4.50 40-61 engines 1.50perft. 19 5.10 TFE tubing for G-20 40 — 130cable· 1.00pertt. HUGHEY H-25 40 5.40 TFE Tubing for 21 OUTRIGGER I-27X 60 40 5.80 186 cable 1.10 per ft. 1-30 60 40 5.80 Many other available items. Call $97.75 J-30 60 40 6.05

w a t c h f o r o u r 1979 R/c c a t a l o g ! Want anything you don’t see— call us!

EMPIRE MODELS ™ M602)881·1257 dS t d R 0 ^ 4 2 " ^ T ^ J K T O N A e 5 W 3 IMMEDIATE SHIPMENTS WE* THE PEOPLE OF THE UNITED STATES* IN ORDER TO á FORM A MORE PERFECT f UNION DEALER INQUIRIES INVITED ZAP REVOLUTIONARY SUPER GLUE SUPER STRONG . . . SUPER FAST. . . ADHESIVE SUPER CLEAN AND EASY TO USE! DIVISION The precision adhesive for PACER TECHNOLOGY & RESEARCH • Modelers · RC Automobiles 1600 Dell Avenue • RC Aircraft · Miniatures Campbell, California 95008 • RC Boats · Hobbies (408) 379-9701 G ef revolutionary SUPER ZAP at your hobby dealer's.

tions which the Kavan engineers and test basic idea was to get away from the pilots have felt were important. With moving servo plate and simplify the new releases- regard to rigid rotor operation, the lead collective pitch movements. This was weights are rather important for smooth accomplished by using a modified ver­ Biicker performance. The blades and the sion of the old "ruddervator” mixers on JUNGMEISTER weights should be matched to the top of the servos, and by firmly mount­ 11/2" machine. With the proper amount and ing the bellcranks on the control base­ sc a le location of blade weights, the entire board. An alternative to this is the rotor system can be extremely smooth installation of new pitch levers (parts No. and stable. With a poor match, loose 3506A and 3507A) which act to control controls, or improperly balanced rotor the swashplate more positively and 33" wingspan, system, your pussycat can and will turn accurately. · .049 power, (1095 into a tiger! Blade weights are generally valuable on all rotor systems. By using Power Boats.. Continued from page 45 great for schoolyard scale weighted blades, the centrifugal forces TRAVEL AIR increase enormously and the gyroscopic built and reviewed this older Hustler .40 principle of rigidity helps to stabilize the three years ago. Al designed a .21 size ‘6 0 0 0 ’ system. If, during an autorotation with version of the Hustler and the Mk II was the engine off, the rotor blades have added. There’s certainly no denying the been weighted with lead strips, etc., heritage of the Hustler Mk II when it is .020 or rubber they will even speed up, exceeding the compared to the .40 version of a few pow er herb clukey normal operating rpm. This provides for years back. A couple of boating friends 3 6 's p a n a controlled descent, leaving sufficient even thought I’d simply dusted off the 1-2 channel R/C or Ire« flight. $14.95 motion energy for recovery near the older boat and installed a .21. Such, ground during the flare. More on auto­ however, was not the case. The Hustler rotations next month. Mk II is an all-new configuration. This past summer, I had the pleasure This kit also breaks away from the of building prototypes of the new increasing use of foam or prebuilt parts positive control systems for both the that are found in many of the outrigger Alouette 2 and Jet Ranger. Perhaps you hydros now being sold. The Hustler Mk saw these machines at the last MAC II is a kit for the builder who still enjoys 1111 fo r r i C 0 2 show in Long Beach at the Kavan booth. the intricacies of assembling a top- available soon. Unfortunately, the mechanisms were quality kit. The quality of all the wood in SEE YOUR send 259 for covered so you couldn’t tell how they this kit, aircraft grade plywood and DEALER NOW catalog worked, but now that Kavan has given spruce stringers, is simply the finest his OK, we’ll show the sketches (and available. All parts are precision cut on a FLYLINE MODELS, INC. naoooftft AvtMUf i* H photos if space permits) of the control bandsaw and I can honestly state that I fAine&i vMGiWi* Tie* irUlin-MM concept, as applied to both kits. The have never seen a finer job of cutting out

94 R/C MODEL BUILDER THE QUIET REVOLUTION By BOB BOUCHER "This book tells you everything you ever want­ ed to know about electric flight, and many things that we bet you haven't even dreamed of yet. Over 100 photos and detailed drawings of models of every type and description that you can build and operate; free flight planes, R/C planes, scale mod­ els, autos, boats, even manned electric planes and solar powered planes. Extensive references to suc­ cessful designs and where to get plans. What kits are available to use with your motor. A list of elec­ tric articles in the leading U.S. magazines. Do's and don'ts, and other helpful hints. "This book is a must for everyone who owns an electric system or is thinking about buying one." THE QUIET SEE YOUR DEALER OR ORDER DIRECT REVOLUTION

THE COMPLETE MANUAL OF ELECTRIC PROPULSION SYSTEMS

RSTRO FLIGHT inc ROBERT J. BOUCHER PIONEERS IN SILENT FLIGHT 13377 Beach Avenue Venice, California 90291 parts for a model boat kit. Having cut Building the Hustler Mk II reminded me more than my share of plywood over the of putting together a jigsaw puzzle. past 13 years, I can really appreciate the There are lots of parts. However, each RUBBER STRIP work that went into cutting out the parts part is clearly numbered or lettered and FAI RUBBER: ENDORSED BY BEST of the Hustler Mk II. Also included in the the building instructions are most ade­ U.S. RUBBER FLIERS. MADE IN U.S. kit are machined aluminum sponson quate for telling where each part is to be SIZES: 1/4", 3/16", 1 /8", 3/32", 1 /16" mounting brackets with mounting hard­ placed. I personally received a great deal 1mm THICK (.042). SPOOLED, ware and an Octura slant motor mount. of satisfaction from building the Hustler GROSS WEIGHT 1 POUND. I’ve got to tell you about the Octura slant Mk II because it did require more of my PRICE $10.00 PER SPOOL PPD. IN mount. Apparently, I'm one of the first skills as a model builder. I don’t plan to U.S. ADDITIONAL SPOOLS, $9.50 guys to use one out this way. Almost get into one of those “ Glue Part A to Part NEW PIRELLI everyone who looks at my boat tells me B” kit reviews because I believe that's SIZES: 6mm, 5mm, 4mm BY 1mm. my engine is in crooked. There is also an why the manufacturer wrote the instruc­ PRICE: $14.00 PER HANK PPD IN additional running hardware package tion sheet. However, there are just a $13.50 available from MMRE. couple of things that should be men­ U.S. ADDITIONAL HANKS, tioned because they are most important SOLE U.S. DISTRIBUTOR AND The boat measures 31 inches in length WORLD WIDE SALES. with a width of 15-3/4 inches. A hot OPS to the final results. or K&B .21 will really make this little Time and care should be taken during rigger scoot. Evidence of its scooting the assembling of the framework of both PO Bo* 9778 ability is substantiated by the fact that the sponsons and the center section. A Phoenix, Arif on· 85068 Gary Preusse used a Hustler Mk II to twisted framework is going to cause grief when it comes to running the boat. establish a new IMPBA record on the 1/3 setting up of the hardware and radio mile oval last year. This same boat has Be especially careful during the applica­ tion of sheeting so as not to cause a equipment. This is especially true in the been timed at 67 mph in the 1/16 mile smaller hydroplanes. I would suggest straightaway. Although that’s not near twisting of the framework while clamp­ ing the sheeting in place. My hull came that unless you know your different the record for the class, it’s very good for types of hardware for model boating, a boat that holds an oval type record. out very true because I took time to align everything carefully. This isn’t the type you order the running hardware kit that According to Bill and Gary, the boat has is available for this particular boat. The proven to be very successful back in the of boat that lends itself well to a rush job during the building stage. Take the time balance point for outriggers is most Chicago area, and that area is definitely a important and is shown on the plans. To hotbed for outrigger hydro racing. to do it right and the results will be more than satisfying in both self-satisfaction achieve the balance point shown on the There are basically two aspects to and performance. Looking at the build­ plans, I found it necessary to move my building the Hustler Mk II. These two ing photos will give a general idea of the radio box forward. This was very easy to aspects are the sponsons and center construction sequence. The boat is not do in my case, since I wasn’t using the sections. The sponsons don’t contain difficult to build. hatch to cover the top of the boat. anywhere near the amount of material Moving the radio box is a very easy way as that found in the center section. Another very critical factor is the to help achieve the proper balance

AUGUST I979 95 P ylo n ...... Continued from page 13 conjunction with one another much as BOATERS! Form I and QM are today. At a large Form One race with about 60 entries you could reasonably expect to get 35 to 40 Start Your Marine Engine FAI entries. Not having been involved in any racing except QM at that time, I can’t say From Your Transmitter for sure why interest died, but here are some of the reasons given: 1) FAI racing wasn’t exciting enough; 2) tempera­ mental engines; 3) airplane configura­ tion and specifications. Let’s look at the statements a little LECTRA-STARTER more closely. Yesterday's Daydreams Have Become Today's Reality with LECTRA-STARTER. 1) Not exciting enough (really trans­ NOW A T LA ST you can start any engine from the transmitter with the revolutionary lates into not being as fast as Form 1): I Lectra-Starter (Patent Pending). After 3 years of development and testing we are went back through some old stats on happy to announce the most versatile, powerful and practical model starting system In the world. Form I and FAI in regard to times. I What could be more exciting than starting your marine engine with the boat In checked the 1972 Chicago Nats results, the water, while you are standing on the beach. Ideal for the competitor, sports which are the last big FAI race results enthusiast and the scale modeler. All Lectra-Starter systems are equipped with a patented clutch assembly which readily available to me. The fastest Form disengages when the engine starts, allowing your engine to run up to full speed with I qualifying time was by Bob Smith with a no power loss. 1:27.5, as compared to the FAI team of Unit fits entirely into your model - Simple servo operation - Bolt on installa­ Telford/Violett’s best qualifying time tion - Completely waterproof - One evening installation time - Complete pack­ of 1:44.4. That’s not a very large margin age includes all hardware, mechanical, electrical components and battery - 25-50 starts per charge - One battery does it all, no additional glow circuit is of difference. The current Form I record needed · Light enough for a .20 size model or powerful enough to start the is now being claimed by Bill Williamson largest high compression engine-Can be used to restart a stalled engine - Versa­ of Apopka, Florida, at around 1:09, if I'm tile and compact; can be transferred from one model to another easily. not mistaken. I would assume that had Many systems to choose from, all marine engines, O. & R.'s, Ropers, Quadras. the U.S. continued to participate in FAI System s also available for aircraft, helicopters and prop drive units racing, we would have seen an equal For prices, Inform ation and literature, contact: drop in lap times in that event. EASTCRAFT SPECIALTY PRODUCTS - Marine Division 2) Temperamental engines: This 709 Longboat Avenue · Beachwood, N.J. 08722 · (201) 240-3882 problem seemed to be mostly related to We honor MasterCharge and Visa. having to run a fuel mixture without being able to use nitro in the mix. The most commonly used fuel was 80% point. The radio box I used is available I’m using a JG-I25X, and the boat runs methanol and 20% oil which, for those from G&M Models, P.O. Box 342, Broad­ plenty fast. I’m fine when I’m out not accustomed to running such a mix, view, II 60153. and comes complete with running the boat by myself, but this is a made the setting of the needle valve all the fittings. It's a real nice box and has race boat and after racing mostly stock even more difficult and critical than with sufficient room for any of the popular outboard tunnels the past three years, a nitro based fuel. Weather also played a radios being used in our hobby. My going to a much faster outrigger is taking more important part in getting good Kraft 2-channel with the big KPS-15A some adjustments on my part. Things engine runs. Instead of being able to tip servos and big 500 mah battery pack fits happen much quicker in the hydro the nitro or propylene oxide can to in without any problems. All the hard­ classes and it takes a great amount of allow for changes in temperature or ware and radio equipment should be anticipation to be ready for them. humidity, it was necessary for the flier to added prior to beginning the finishing Racing these little boats, no matter what adjust engine head clearances through­ process. My Hustler Mk II was finished the brand name, isn’t easy. Exciting, out the day to enable his engine to using K&B Superpoxy products. The challenging, and sometimes frustrating perform at its peak operating capacity. boat was sanded and all cracks filled . .. racing a .21 rigger is all these things. Many competitors did not have the prior to brushing on a couple of coats of But easy it isn’t. background in handling engines in this K&B clear that had been thinned 25%. For the person who has raced an manner, where as little as one or two After the clear had dried, the boat was outrigger hydro, the Hustler Mk II has thousandths head clearance meant the sanded again and the K&B primer was the potential to run right up there with difference in a good performing engine sprayed. This will bring out more pin­ the best of them. The limiting factors in run or ruining the engine. It’s generally holes and cracks that can be filled, and how well this boat will do in competition conceded that it’s easier for the average then another coat of primer can be rest on how well the builder sets up the racer to set his engine running a nitro applied. The boat was sanded again and boat and his/her ability to really get in based fuel in regard to finding a peak final color coats were applied. Mine was and mix it up. I know the boat is capable; but still somewhat forgiving needle painted all red and then peel-off letters I’m not so certain about my own skills. I setting. were applied. I was going to use some will say that I’m learning at every race Back a year or so ago, when Terry striping tape but couldn’t find any, so I and did manage a third place finish at Prather and some other people were decided to just go with what I’d done. I the fist NAMBA District 8 Championship promoting the idea of slowing Form I don’t spend much time doing fancy Points Race being held in Longview, down, it was recommended that we go paint schemes on my competition boats. Washington in early May. With more to 15% nitro based fuel as a means of I know I’ll run over someone or some­ time and practice, my skills will begin to reducing speed. Several races were run thing, or someone will run over me and reach the potential of the boat, and then on an experimental basis with 15% nitro. mess up a lot of work. look out! The .21 rigger class is exciting Lap times increased only 5 or 6seconds if Running the Hustler Mk II has proven and the Hustler Mk II can make that my recollections are correct, and it to be a real relearning experience for excitement happen. · seems that we should only expect an­ me. Having not built or raced a hydro in other slight increase in times if we were the past three years, I find my skills are to go without any nitro at all. somewhat behind what the boat de­ mands. The boat drives easily enough. A consideration which has just reared

96 R/C MODEL BUILDER its ugly head and may affect our current QM and Form I flying is the shortage of nitro. In case you weren’t aware of it, there is only one manufacturer of nitro in the U.S. And it seems that awhile back SAVE $150 ON YOUR NEXT RADIO! they suspended production of nitro and thereby created a shortage. . .not just to Buy a Digital Commander Flite us racers, either. . . but to everyone who Pack Kit and Save Money with­ was using nitromethane. They are cur­ out Compromising Quality or rently back into production but the Performance! price has jumped to over $1000 a barrel.

So not only are we faced with the Three Servo Options; Two Receiver Options; K it Prices Start at $74.95! possibility of not being able to acquire nitro from time to time (how would you For details, send $1 for our like to go to a race where everybody else latest catalog. (Add $.50 for had their 70% nitro fuel and you were 1st Class return and $1 hand­ ACE R/C, In c . only able to come up with a 25% mix?), ling for any direct orders.) but they also have us by the short and (816) 584-7121 BOX 511D, HIGGINSVILLE, MO. 64037 curlies when it comes to price. So the problem of what we’ll be using as fuel may be decided for us by people anyway, it really shouldn't be of any other than ourselves. concern. The other problem area is that unless 3) Aircraft Specifications: The biggest ANNOUNCING something has changed in the last Fa·! Steep Climb FLat Slow Glide differences between our Formula I several years that I’m not aware of, event and FAI racing is in aircraft size retractable landing gear is allowed in and the style(?) of planes allowed to FAI. This may or may not prove to be an compete. In FI we are limited to replicas obstacle, as my feelings are that a well- of the Goodyear, or as it is termed now, built Form I ship (to FAI area specs) with For the new P 30 claaa 190 cubic inch Formula I full-scale racing here ia a model deeigned with fixed, airfoiled undercarriage and skin­ the novice in mind and hat the r ; ------\ event, whereas FAI is open to original ny wheels/wheelpants would be com­ potential to win in the toughest frompeTttion^ prototypes or models resembling full- petitive with an FAI plane with retracts. scale aircraft that were designed for or It’s tough enough to build a 5 lb. mini­ THE POT ENT·· 30 have raced on a closed course. The Delexe kit features include mum weight airplane with a fixed gear, Rolled balsa fuselage and wing mount with d4. above in itself doesn't present a major Completed prop ana nose plug tail plug A ru d d e r and I suspect that adding retracts and Precut wing ribs, spar notches Job rated balsa atrips problem as we could take any of the beefing up the wing to withstand the Highest quality tissue, lubed contest rubber Goodyear full-scale racers and use a stresses plus the weight of the retract Detailed inatructions. flying tips to help you winl model of them in either our Form I or CAT NO R2 $6.95 PLUS $1 00 PAP mechanism would outweigh the aero­ check or money order to CHAS. WERLE FAI. . . except! The exception being that dynamic benefits. Besides, our Form I 3620 MORSE AVE NO 8 SACTO. CALIF. 05821 our FI planes are limited to a wing area of rules don’t say you can’t have retracts no less than 450 sq. in., whereas FAI is installed, just that you can’t use them. limited to no less than 600 sq. in. But it’s has been and is a movement to go to really not that great a difference, as FAI One other area that may present a tuned pipes. And as we know from our counts the area of the horizontal stab problem is that of mufflers. Most all own FI and QM experience, the short when figuring wing area. When you countries outside the U.S. have a noise pipes we use to extract the exhaust look at the most-used airplane in FI, the limitation rule (around 85 db) which residue from within the cowling do a Prather Toni, and figure in the stab area must not be exceeded. Prior to the very super job, so just look what we could do (70 sq. in.), you’ll find a total surface area recent past it had been necessary to use with a real tuned pipe. of 520 sq. in. So we’re really not too far a muffler, as tuned pipes (which can SOAPBOX from being legal in FAI. There is also a meet the db level required) were not Also keep in mind that there is an restriction on minimum wingspan, but allowed. While this rule may not have undercurrent movement in this country as we’d probably have to add area been formally eliminated as yet, there to slow Form I down as a safety factor.

Made in W.Germany PERFORMANCE · PRECISION · POWER DESIGNED AND MANUFACTURED TO MEET THE HIGH PERFORMANCE DEMANDS OF TOMORROW’S COMPETITION-TODAY! HB.21 PDP* (3.5 ccm) The HB-CAR ENGINE is an engine with •Perry Directional Porting one purpose in mind... TO WIN AUTO RACES! This is not an aircraft engine that was modified for cars, but a car engine intended only for cars.

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AUGUST I979 97 I’m one of those people who are basi­ things, several of these other countries cally in favor of the slowdown move­ go strictly by times. .. even though they SILKSPUN ment. I’ve said it before and will say it race more than one plane at a time . . . again (and again, and again): Outside of rather than like our Form I point system. COVERITE a few really sharp pilots, most racers are If you have feelings about this, you’d STILL THE MOST ECONOMICAL behind the airplane . . . Form I mostly, better let it be known. IRON-ON COVERING but Q M ’s are getting to that speed area Bob needs your input so that at the Red, White, blue, .. .atsomepointduringaflight.Slowing next FAI meeting concerning racing yellow & orange them down a little bit isn’t going to ruin rules we can formulate a proposal that, racing as long as we are running fairly should it pass, we competitors would ONLY 58 i close in competitiveness, and any extra back up with participation. Write Bob at PER SO. FT. reaction time we can allow ourselves is the above address. · THE to our mutual safety benefit. Changing GREATEST FOR SHEETED to a larger plane (FAI) and/or less potent H alf-A ...... Continued from page 29 SURFACES. fuel would serve to slightly slow things down and also allow us to be in the FAI everything goes together. I don’t know COVERITEu game again. if I am being clear, but some models 420 Babylon Rd., Horsham, Pa. 19044 So there you have the basic differ­ look as if they have been assembled at ences in the two kinds of racing. What random from several different designs. we’d like you to do is to think about Others, and Greg’s PA-2 is one, just where the U.S. should be in this. The seem to be happy with themselves. No mWBBVB time to change things (if that’s what one part dominates, and each curve S t r e a k e r needs to be done) is apparently now. complements the rest of the aircraft. While at Toledo, I also had a chance to Even choice of decor matches the over­ talk with the editor of the English all effect beautifully. · magazine. Radio Control Models and Electronics, Bill Burkinshaw, who, as it River of Air .. Continued from page25 happens, is also a racer. Judging from FIBERGLASS COMPETITION that broadcast right from your airplane’s DEEP VEE Bill’s impressions of the desire of other cockpit, telling you continuously (and • Uses 6.5cc Engines & 5" Motor Mount countries to get the United States back •Tw o Channel Radio into FAI racing, it seems that if any monotonously) whether your plane is • IMPBA & NAM BA Legal changes in rules or aircraft specifica­ rising or descending. What is taught me •Page After Page of Building Photos & Instructions tions are going to be made, now, more was very depessing news: sailplanes that • Uses Steve M uck’s Hardware Set No. 66 than at any time in the past, is a realistic are not in lift are constantly sinking out •Length 39.3·' - Width lOVz" - Kit No 58 possibility. of the sky. Write Tot/αν for Free Catalog Bob Brown, 1255 High St., Bradford, DEALERS & DISTRIBUTORS WASTED Of course, this is only common sense: 6003 Daven Oaks, Dallas. TX 75248 PA 16701, is the U.S. rep to the FAI you launch, you fly about with gay Phone: (214)661-1572 Council on racing. Bob is looking for abandon, and unless you strike lift you opinions from us, the interested racers. strike the earth instead . .. usually in The biggest problem over the years has four minutes or less. But somehow I had been communications. . . not only here always entertained the illusion that I within the U.S. but also internally in could park up there for minutes at a other countries. When you throw in stretch, in zero lift, and just wait for a international communications the prob­ thermal to blow through. Not so. Any­ lems become even more magnified. time you're not visibly falling out of the With all the talented, aggressive people sky you’re in rising air, and you'd better NEW! FOR THE C/L FLYER currently pushing to unite FAI racing shake yourself awake and start exploit­ SAFE-LOK LAUNCHER worldwide, this seems to be the time for ing it, unless you want it to go rising off you to get involved, one way or another. Features: plated 1/8" x 4" c.r. steel support eee- downwind without you. ber, plated 5/32" manganese bronze moving parts, Remembering that we can’t have A thermal that is barely maintaining .050" X 1/2" aluminum anchor strap; simple anchor­ ing: stake to turf, spike to asphalt or screw eye­ everything our way, consider the above you, down low, will almost always get bolt into 6-32 T nut (furnished) for board mount­ points and let Bob Brown know. Do you better, if you have the nerve (and the ing; 25 lb. capacity, will not pull apart at 125 lbs; spring biased restraint arm is thrown to want aircraft built to Form I or FAI specs? eyesight) to stick with it. I relearn this open position on release, built in lock pre­ Would you prefer a tuned pipe or a vents accidental release. , i again and again, flying my handlaunch muffler? What type fuel would you want ships: thermals grow. Sometimes they to run . .. 80/20,15% nitro, or unlimited dissipate unexpectedly, just fall apart EsM ejSO lair M S i f nitro? around you . .. but not often. Usually MODEL COMPONENTS box S626, eu cene. or 9740s One other area that you might want to they grow. I remember making half a comment on is that, as I understand dozen circles in what seemed like lift

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98 R/C MODEL BUILDER Semi-big fun scale Fokker D VII Quick build up Kit OL781 $ 9 7 .5 0 FOKKER D- VII: Engines. 60 size Wing span 72” Wing area 1488sq.in. Weight 10 lbs. 4-channel radio required

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KIT FEATURES: 2 full sized rolled plans See your dealer or order direct step by step constructbn manual postpaid Hardware package includes; with photographs Prototypes flew great with a K&B .61 aluminum motor mounts, quality die stamped balsa parts and 14-4 prop. machine cut hardwood parts pinned hinges, snap links, Dealer and distributor inquiries machine cut and pre-sanded control horns, nylon bolts, invited plywood parts landing gear strap, socket head preformed balsa blocks bolts and blind nuts, plus all preformed leading and trailing necessary fittings. edges preformed landing gear and cabanes heavy duty one piece ABS cowl

Accessories included: 5 ' scale wheels Scale machine guns Scale pilot Self adhesive decals ************************ moment arm, the stabilizer reacts to lift * or sink much quicker than the wing, ____ + kicking the nose down in good air, up in bad. That’s the chief reason I like such 7 Η Β ! » = - p r o P E L L O R S * rearward CG on a sailplane . . . it makes * the stab even more sensitive to fluctua­ 23018 S NOfl MA NO· i AVI T OR RANČÍ CA 9040? PHONt 213-539-2313 tions in lift and sink. For the same reason, I and a lot of other cranks insist on lowering Hobie Alter’s wing inci­ ♦ dence on our Midwest Hawks. I just CUSTOMIZED couldn’t adjust to the sight of a fuselage that perpetually flew with its tail 10° up * * in the air, as if it were always in tre­ * · mendous, hat-sucking lift! » 3 and 4 B LADED Developing a sensitivity to minute * Size 18",- 20" and 22" Dia. in 6",-8” and 10" pitch changes in air quality will probably add * These props are made to fit inside our 6" Dia. more to your enjoyment of soaring than * spinner. anything else you can do. And this ♦ S 40.00 each. applies equally to sport and competitive * flying, because staying up until you want * 24",- 26" and 28“ Dia. in 6”.- 8" and 10" pitch to come down is what they’re both * These props are made to fit our 634" Dia. spinner. about, right? I think this is what people + S 48.00 each. are getting at when they say things like * “ know your airplane well,” or "always * practice with the same plane,” or "don’t * keep switching designs if you want to * win.” What they really mean is learn to * recognize instantly your sailplane’s * Individual response to good and bad air. When * you start to drive out into deep molasses, * Blades the quicker you recognize it the quicker * you can make the decision to go else­ * Replaceable where. And this kind of rapid response * Price will add minutes to your flight time, * Extra blades - S 6.00 to $ 10.00 each whether you’re competing or Sunday­ * soaring. * * PAT. PEND. A lot of sailplane fliers tend to be ★ ★★★★★★★★♦★★★★★★★★★♦★★★★★★■Λ ·*-*·*·*··*··*·-*·*·*·* loners . .. they slip quietly into the local hobby shop and buy a kit or a handful of directly above my head at a Bakersfield balsa, then disappear into the bush like contest once, then heading off upwind an illegal alien. They fly alone, or in to find something with a little more small, inconspicuous groups somewhere energy in it, something a little more like out in the far, green meadows beyond New Mexico lift. In two minutes I wason the phone lines and the last McDonald’s the ground, and walking sadly back to wrapper. I can identify with thesestrange the pits. Mark Smith had been watching folk, because I’m one of them. Three from the sidelines, and when I passed good pilots, all on separate frequencies, him he looked at me and shook his head. are my idea of a comfortably full flying "Never leave rising air, Dummy,” he field. If somebody shows up on my said. frequency it’s never a problem, because Dave Shadel gave me the next hot tip, I was just leaving anyway. and it concerns what to do when you’ve But loners like myself lose a valuable The M.A.P. followed a fat boomer as far downwind asset in the soaring game: the habit of range of plans as you dare, and you’re ready to head "keying” off of other sailplanes in the from England back to the field. "Never leave your sky. The Honorable LeMon Payne is the largest, (Democrat-Texas) is a wizard at this. He most compre­ thermal and come straight back up­ hensive in the wind," he used to say. “ Odds are. the watches his competition the way a cat world. Buy a biggest sinkhole is right behind the watches a goldfish, and it doesn't take ** plans handbook thermal’s core. To avoid it, leave the him long to pick out the consistent pilots and find out for yourself. core by tacking off to one side or the in his flight group, the ones he can use to The handbook contains full other, and come home in a series of base his go/no-go decision on. Full- details of all of our thousands scale soaring pilots use each other of plans and their prices. tacks, or zig-zags, like a sailboat. You can Many of these plans are see what your plane is doing a lot constantly in this manner. Lots of available from our U.S. agents better if it’s in a slight tack than if the "markers in the sky" (i.e., other sail­ listed in the handbooks. nose is pointed directly at you.” planes) make thermalling easier for Handbook 1 Aeromodalling Hurrah! Excellent advice, David! It’s everybody, and for this reason quite a Handbook 2 Modal Boats and Cars always better to keep your sailplane’s few hot competition pilots feel that it’s Handbook 3 Modal Engineering side-view in view as much as possible. actually easier to find thermals during a Handbook 4 Radio Control Aircraft Most of the feedback about the quality contest than during practice! of air we’re flying through comes from Not only do competition flight groups model & nilied our observation (conscious or other­ give you obvious markers to go by Publications ltd wise) of the angle which the fuselage ("Don’t turn west, old Harvey Kickstan is assumes in flight. Airspeed,sluggishness out there sinking like cast iron!” ) but Available in the U. S.A. of the controls, liveliness of the wings you have a continuous, day-long stream Price $1.50 each including postage from: Sale· Office. P.O. Box 36. Bridge Street . . . these things are also indicators of of planes in the sky, just begging you to Hemel Hempstead. Herta. HP11EE. good and bad air. But the angle of the watch them and time the lift cycles on England. fuselage tells all. Because of its long the field, just dying to point out to you

100 R/C MODEL BUILDER or any patient observer where the day’s hot spots for thermal and wave activity are occurring. Each time a flight group WESTBURG launches, you have four or more eager SCALE PLANS pilots tearing off in every direction to 11/24th sue 1/2“ « 1 ft No sheets Price test the air for you, to make all your DougIβ* 0-35/B-7 1 83 28 1 mistakes in advance. . . IF you’re willing Douglas XO-38/XB-7 3 25 1/ 12th t i n : 1" - 1 f t to watch and learn. (What's that? You’re Curtis A-β Shrike 3 $8 25 in the first flight group of the day? C u rtis· Gulf hawk 1A 2 6 50 Well.uh, in that case, maybe we’d better Curtiss O-IB/A-3 Falcon 3 625 Curtis· XP/YP-23 3 8 25 just move on to the next hot tip.) Czech Avls B-534 2 550 Which has to do with downwind Devis D -tK 2 5.50 Douglas 0-2SC 3 825 thermals. I don’t recall who first pointed Douglas 0-31A/0-31B 3 825 it out . . . maybe I learned it watching Douglas O-31C/Y10-43 3 8.25 Otto Heithecker at the '74 SOAR Nats Douglss 0-38/0-380 2 5.50 Douglas 0-43A 3 8 25 . . . but very few people ever practice Douglas 0-46Λ 3 825 thermalling downwind. A long-time Fokker D-XVII 3 8.25 Price includes handling and free flighter, Otto had a good feel for General Western Meteor 1 325 first class mailing within the Travel Air 2000 2 550 United States, Canada, and Mexico. thermals moving through the launch Waco ATO Taperwing 2 550 On foreign oversees orders, area. He was famous for coming off the 1 1/ 10tti size: \T - 1 f t top of the tow and turning (Oh, no! Barllnef/Joyca P-18 4 110.90 calculate postage based on What's he doingl) straight downwind. Curtiss Hawk P-66 4 110 50 80 grams per sheet. Fiat CR-32 3 8 25 No rolled prints — folded only. 4 Great Lakes Trainer 10.50 All prints are blackline — 30 x 42 inches. "Why go looking, when I already know Hawker Fury Mark I 4 1050 Hawkar Taper Wing Fury 3 8 25 where a thermal is?” Otto asked quietly. Hawker Persian Fury 3 8 25 He practiced a lot, in variousconditions, M onocoupe 90A 2 550 PETER WESTBURG so he knew just about how far he could Sparmann P-1 2 5 50 Curtiss F9C-2 Sparrowhawk 4 10 50 834 Seventh St., No. 8 hang it out in any given wind. And it Curtiss N2C-2 Fledgling 4 1050 Santa Monica, Calif. 90403 ought to be pointed out that he always Stearman 4E. t/12 size 2 5.50 flew large, clean airplanes with mucho ballast. And ballast is hot tip number next. SCALE CLAS Now, I’m not a ballast fan, myself, the idea of adding cold, crippling LEAD to anything as light and delicate as a model airplane strikes me as an unnatural act, a sociopathic perversion . . . like praying for wind. But I look around at the people who win contests, the people who are Plans & Construction Manuel STINSON RELIANT SR· β RUBBER SCALE PLANS •cuR Tiee h a w k pee still in the air long after I'm back on the '«ScBto«4V8fun ·2 2 .·0 Va Scale 1W Bpmn ·2 6 · ° COMPLETE PLANS SHOW ALL PARTS. r S c i M U ’ 80 »n n 2 .*o rmS e a l · S4* S p a n iV i Γ Span ·1*Α<> ground, and what I see in their tool BOTH WMOS. FULL STAB. PROP BLANK. 1V |-Scale 47>Tβρβη Π θ··° lots of different sizes of ballast. •CURTISS OOSMAWK Pile· boxes is SCALE SOURCE REFERENCES *· 8cala 63· Span SI·-··

They have ballast for light winds, ballast 20'Forkerte SK-2. 20'C m by CR-4, •CURTISS OULRHAWK1A la 6 3 ' S p a n 616 9 ° · New % Soala M V Span 63Q— for gusty winds, ballast for gale winds, 13" Chambermaid. 13' Folkarte SK 2. ■ rScaia» AAd63‘ ·1 8 ko Ď*-ee> spr Poeieae a"B MenanŘf ~ ballast to loan, ballast to spare, ballast to IS Ftoyd Bean. IB" Sfnlmof» Bearcat

AUGUST 1979 101 spin. My control surfaces are set up with limited movement and seem about right FLY WITH THE WINNER! in other situations, and incidences are as specified on the Bridi plans. Also, this Pro Line radio control equip­ occurs in relatively mild banks (30°-45°). ment is the choice of champions. I have been told by my instructor and Think Pro Line: by several other experienced fliers that When you want reliability... this is a characteristic of these trainers. When you want performance ... However, it still bugs me. I have always When you want the very best... heard that the function of an airplane's control surfaces is to position the wing When you want to be a winner! so that it moves the airplane in the We make every piece of Pro Line desired direction. As I understand it, for gear as if it would be most models the normal procedure used by a winner . . . and it would be to bank over with the ailerons usually is! and add elevator to actually make the turn. I guess what I'm asking is: 1) is this ' . N i really normal or do I have a basic Join Pro Line! misunderstanding of the principles Join the Winner’s Circle of involved; 2) am I doing something Radio Control! wrong, or; 3) is my plane set up wrong? Your advice would be greatly appre­ ciated. Sincerely yours, joe Carnett. Dear Joe: Your understanding of the fundamentals is fine, and I don't think you’re doing anything wrong, but I’d guess that the airplane is set up wrong. I’ve got a hunch that if you jack up the leading edge of the wing 1/8-1/4 inch, it might cure your problem. My guess is that the fin is being blanked out, giving you spiral instability at increased angles of attack. A small sub-fin added on the Pro Line Electronics Inc, bottom may also help cure this problem. Dear Dave: I really appreciate your 10632 North 21st Ave.. Suite 11 Phoenix, Arizona 85029 column, and I keep having the fear (602) 944-4626 a subsidiary of Pace Industries you'll be snatched from R/C Model — Builder. Every time I hear your plea for questions I feel guilty about not writing you. Believe me, I have an unending list Another idea to pass along is that on of beginners and average flier’s ques­ FREE FLIGHT my 1-1/2" = 1* ABC Robin, I had a dickens tions. HARDWARE of a time finding wheels of the right I’ve been modeling for a few years diameter for it. At first. I was going to (still training at R/C). I’ve designed and turn out a pair using a lathe, but lack of built a few R/C, F/F, and C/L models, experience and time negated that idea. and with flying friends, etc., I’ll be able Williams Bros, wheels did not even to give a wide range of questions. come close, but I had a pair of Hunger- 1) Where can I easily obtain 3-views ford stainless spoked wheels that were and cross-sections for different aircraft? just right. Unfortunately, the Robin did (I’m currently looking for an Aeronca not sport wire wheels. Now what? To C-3 Collegian.) make a long story short, I turned out a 2) How can I make effective use of shallow disc on my little Sherline lathe. bracing wires which enhance structural Then I vacuum formed four of these integrity (as on my C-3)? discs. By using a compass, I drew a circle 3) What kind of wing loading should I of the appropriate diameter, which in have on a .15-powered, 5-foot span C-3 turn was cut out using a pair of scissors. (I want it pretty light for scale-like flying Using a Whitney punch, I punched a speed)? Cordially, Pete O. Hudson. hole in the center for the axle to pass Dear Pete: Excellent 3-views for the through, and on two discs I punched an Aeronca C-3 Collegian, as well as many F/F Scale . . . . Continued from page 73 additional hole which represents the other aircraft, are available from Histori­ access hole to the tire valve. After the cal Aviation Album, P.O. Box 33, Temple can put it on ever so thin with virtually discs were painted, they were attached City, CA 91780. A list of drawings and no weight build-up. Yet, the color is to the wheel using contact cement. You aviation books is available from them uniform. When doing my model, I ran may ask yourself, "Is this any way to treat free of charge. Peter Westburg, whose out of the non-buffing type, but had the a Hungerford stainless steel spoked outstanding drawings appear regularly other on hand. There was quite a dif­ wheel?” Maybe not, but necessity is the in RCMB, also has drawings for sale. ference between the two. This latter mother of invention, and I think they Write to him at 834 Seventh St., No. 6, material appears to require more for look pretty darn good! After all, I can Santa Monica, CA 90403. covering, plus there is a tad more always take the discs off! · weight. So, the next time you have to Bracing wires can be an important part have an all-silver finish for your rubber of the structural integrity in this type of model, try using Spray-and-Plate. I think Instructor . . . . Continued from page 12 airplane, allowing you to keep it light yet you will be very satisfied with the results. like the airplane, but one thing about it strong. Be sure to use steel cable and I have a Pfalz D-lli under construction puzzles me. When making turns,I give it keep them tight. which is basically all silver. When I some aileron to bank it over, but I have Your C-3 should come out with a wing complete this model, I will do a follow­ to carefully avoid giving any up elevator, loading of about 15-16 oz./sq. foot for up on this product. or the plane flops over into a vertical what you want in performance. This 102 R/C MODEL BUILDER means a total weight of about 3 to 3-1/2 pounds, which may may be difficult to obtain. Keep it as light as possible and it should fly OK, but don’t forget to balance it correctly (about 25%). THIS VISE IS Dear Dave: / want to be able to side­ slip into a landing, and would also like to climb straight up to a vertical stall . . . shove the elevator control forward CATCHING. (down), cut the engine to idle, and have Catch PanaVise. It tilts, turns and the ol’ bipe drop tail first upside down. I've asked numerous “experts" if they've rotates your work exactly where ever tried such a thing, and they just you want. Add our new Tray! look right through me and mumble It catches small parts you drop, something about the price of goose- separates tools, and keeps parts down in Bangkok as they walk away! sorted. The Tray's wide 8Vii" diameter Some experts. Hey fella, when the of cast metal gives ‘no-tip’ colonel turns me loose on my own you stability, and has 6 slip can bet I’ll perfect it... if it can be done. resistant neoprene feet. Catch Now tell me, is there any reason it all the PanaVise combinations cannot? Yours Sincerely, lean Paul at your dealers now. Write for Steele. FREE brochure and Dear lean Paul: The slide-slip is a maneuver done by cross controlling the dealer list- rudder and ailerons to cause the side­ slip, and then straightening the airplane out at the last moment prior to touch­ Dept. CH 16 down. It’s a great way to lose altitude to 2850 29th St. land over an obstacle. Long Beach, CA 90806 The falling leaf is really not too diffi­ cult to do and involves pulling up for a tail slide and "over pulling” slightly, causing the airplane to slide and then fall on its bank. I've done it many times by mistake while practicing for a normal tail slide (and once all the way to the ground when a forgotten 2-pound weight slipped from the nose to the tail during a first flight on a new airplane!!! typist- wife). you get the right color on the right wing bow, tip your hat. and smile at the Well that, believe it or not, is the last tip. Don’t do what I managed to do assembled crowd. letter I have, except one on workshops when I had a model of a plane with lights Pay more attention to that scale prop. which I will cover in a column next on the top and bottom of each tip. I I’m sure you’ve seen some, as I have, that winter. If you want this column to managed to have a matched set of colors look like paint paddles stuck in a spinner continue, you’d better drop that ques­ on each tip with one red and one green. with no pitch or shape. The appearance tion in the mail, as I’m out of material for That sure as heck would have confused of a nicely-built model can be com­ future columns. Dave Brown, 8534 the witnesses! promised and actually be better off Huddleston, Cincinnati, Ohio 45236. · WHY DON’T YOU. . .? without having it. Set up your idle so that pulling the Use some black nylon fishing line to 1 to 1 ...... Continued from page 37 trim back shutsoff the engine. It certain­ duplicate the antenna on aircraft. It’s ly is a lot classier than grabbing the strong and doesn’t look like clothesline battery. In a situation some years ago, I spinner, throwing a rag at it,sticking your when compared to the scale of the hooked up my charger to the plug side foot in it, or running the spinner into the model. of the switch. The little light on the dirt or asphalt. As you taxi back to the Run the radio antenna out the bottom charger came on, so I figured I was set. pits, you can shut the engine down and of the model through a curved nylon Some time later, I wondered why the call "flight complete” to one and all, tube and secure with a small rubber battery ran down so quickly. At that point I discovered I’d driven the plug for some 8 hours with the charger. A real YES-SIR. YES-SIR. THREE BAGS FULlT^I intelligent maneuver! LIGHTS Hey! Do you need some wing naviga­ tion lights? Mix up some five-minute epoxy and stir and stir and stir. .. until it’s getting close to that magic moment. Using a toothpick, get a glob and let it gently touch the surface of the wing at the front portion of the proposed light. WALT MOONEY NOW OFFERS 3 BAGS OF PEANUT SCALE PLANS Gently pull the material toward the tapered rear portion and it will fall into ALL WELL TESTEO DESIGNS. AT ONLY fS.OO EACH shape. You may have to do a little EACH BAG FEATURES FOURTEEN PEANUT PLANS, shaping with the toothpick point, but be ONE OTHER, PLUS PHOTOS ANO INFORMATION careful, since as it sets, you may pull out SEND tl.0 0 FOR COMPLETE LISTING ANO SAMPLE PLAN TO: a strand that won’t fall back. Paint them with some of that enamel WALT MOONEY, 2 9 12 CABRILLO MESA OR. in the small bottles and you’ll have a nice SAN OIEGO, CALIFORNIA· 9 2 123 shiny “ light.” Watch out, though, that AUGUST 1979 103 there is a Sportsman and Expert class, and then these are divided into classes or aircraft types, with the lightly loaded, sorta-civilian type in one and the option- f l y E L m r n i c filled, multi and military in another. Frantic work helped me complete my new Sport Scale in time for this event. VL-101 Electric propulsion system Then Mother Nature socked it to me and shown—using Hytork 48 motor and covered the only paved R/C strip in the planetary gear box, SI-3 switch & St. Louis area first with 12 feet ofwater charging jack, and B-33L fast charge and then with a half inch of mud. As a ni-cad flight battery—total weight result, I wound up flying a 12-1/2 lb. twin 2V4 oz.—will power models 25 to taildragger with a double fin/rudder 50” wingspan weighing up to 10 oz. that only clears the ground by 1-1/4 Send 50c for latest catalog showing V L PRODUCTS inches off a grass strip. What fun! full line equipment & accessories. Division of Visla Labs It looks like a banner year for scale Hobby dealers send for information. 7023-D Canoga Avenue participation with many new and excit­ Canoga Park, California 91303 ing models that have been constructed or are in the process. If they turn out as fine as they sound, there will be a strong band and hook nearthetail wheel. Can’t before your wife gives you the brushoff. team representing the U.S. in Canada be seen very easily, but does the job. Put in '80. a small knot in the end and shove it back LOOKING FORWARD WIDGET 10 into the fuselage for judging. Don't As I write this, the leaves have popped I have received a letter or two about forget to pull it out before you fly! out of the buds, the dandelions are the scale project that I have often Use the other housing of flexible making their appearance, and the con­ referred to in this column. For years I pushrods as guides in the wing to route test season in the midwest is about to have thought of attempting the well- tubing for retracts. Rough it up a bit and commence. There has been a large known Widget 10, but have delayed by secure with a spot of epoxy. number of scale models constructed the thought of hooking up those ten Check with your local supplier for during the last winter. I made mention engines. In addition, the four wings homebuilt full-scalers for the polyure­ of a number of nice ones at a local club require an awful lot of building, espe­ thane foam. It's beautiful to form for meeting here in St. Louis in the last cially when you have the polyhedral cowls, wheel pants, etc., and to lay up article. The Mint julep is just next arrangement. I am not quite certain how fiberglass. Once you’ve layed up the weekend and Dale Arvin has received a to handle the retractable floats, and the cowl, etc., you can dissolve or sand large number of entries. It looks like it striped corregated covering is difficult as away the pattern. It works fast but leaves will be a great event. Interestingly, they well. I'll try to have some pictures for your workshop and clothes full of itchy have divided the models in what you in the future. particles. Give yourself a vacuum job amounts to four classifications. First, On the serious side, look around for some of those more interesting projects. Some years ago I found the Alcor C. 6.1 Junior Transport. Very few persons are familiar with this aircraft, but it made a striking model. It was coal black, a twin with the engines way inboard and canted out 3-1/2 degrees. The rectan­ gular gear rotated 90 degrees into open wells. Look around and I’m certain you’ll find some unusual aircraft to model. With sport scale, you don’t need a flock of material. Be a pioneer! A Scaler, who’s name was Mel Flew his Cub like a bat out of hell. Said the judge with dismay, "What a terrible display! His score ain’t gonna be too swell!’’

Letters...... Continued from page 7 Model Soaring) lor 9 years, taking particular interest in 1 /4-scale aircraft. Since December 1973, our 1 /4-scale group has grown to 16. Hying mainly Kestrel 17m, Foka 5, Pilatus, Standard Cirrus, and myself, an A SK. 13. which is a 2-seat trainer. All these machines are llown on various slopes around Melbourne, as well as flat fields, using Ralph Learmont's Launch Master winch, which is driven by a Briggs & Stratton 2-1/2 hp petrol engine, and using the automatic line retrieve system, can launch a 161b. model every 50 seconds. A great improvement over some earlier efforts with a variety of battery powered winches which often "died" half way through a launch. The articles on Mammoth scale are read with great interest, as a number of R/C soaring buffs have bought Quadra engines and are currently busy building their own towing aircraft. We hope to perform the first true 1/4-scale airtowmg

104 R/C MODEL BUILDER POWERFUL - RELIABLE - DURABLE AMERICA’S FINEST MOTORS AT A PRICE YOU CAN AFFORD. FOX 15 SCHNEURLE BALL BEARING B o re ...... 590 Weigh! ...... 6 oz. Stroke ...... 550 RPM with 8-4 prop...... 14,000 Displacement...... 15

The new Fox 15 8B is truly an exceptionally advanced design m otor The Fox version ot schneurle porting

provides lour separate b yp asses arranged to produce m axim um am ount ol pow er as w ell as exceptional low speed

characteristics Perform ance-w ise the Fox 15BB is in the sam e league as the m ost powerful full race engines

H owever unlike others, the Fox is neither cranky nor difficult to keep running at idle and cruise speeds. Som e

outstanding construction features are Fox patented crankcase; separate head button, flange m ounted carburetor

for quick change from control line to R/C; rem ovable prop stud; special 10m m bore ball bearings, super durable

8620 crankshaft T he Fox 15BB is your b est bet for FAI C om bat. G oodyear type control line racing, or Q uarter M idgel

R/C racing, as w ell as sport FC flying 11698 Fox 15 RB for C.L...... $49.95 90301 Tuned M uffler...... $15.95 21698 Fox 15 BB for R/C...... 59.95 21750 Oversize Carburetor 90242 Conventional Silencer ...... 5.95 for Quarter Midget Racing...... 12.00 40716 Button Plug for Racing ...... 3.50

FOX 40BB B o re ...... 800 Weight ...... 11 oz. Stroke ...... 790 RPM with 10-6 prop...... 14.000 Displacement...... 399

T he Fox 40B B is undoubtedly one of the finest 40s you can buy W e have concentrated on getting the Fox 40B B to

pull a useab le size propeller a s fast as possible W e know of no other 40 engine, regard less of cost, w hich will pull a

10-6 prop faster H owever this h as been done without any sacrifice of idle or throttle characteristics The m otor

features the Fox patented crankcase design which is extrem ely sturdy and crash resistant. The flange m ounted

carburetor w e feel is superior to the clam p in design b ecau se it produces no crankcase distortion Im provem ents for

1979 include a com pletely redesigned bell shaped com bustion cham ber w hich runs taster than before, and a restyled

extenor w hich w e feel you will like. T he m easure of any en gin e is how it H ies your airplane. In this departm ent the Fox

40 excels. It is very e a sy startin g. docile to handle, and p uts out excellent pow er even in over-rich or o ver-lean settin gs

T he parts are sturdy and structural failures alm ost n ever occur. T he cylinder is m inded for long life. Ihepiston fitted w ith

one free to rotate com pression nng which practically never w ears out.

14100 Fox 40 Schneurle BB for C.L...... $54.95 90302 Tuned M uffler...... $19.95 24100 Fox 40 Schneurle BB for R/C ...... 64.95 90412 Vi" Prop Extension ...... 3.00 90252 Conventional Silencer ...... 7.95 90413 Vi" Prop Extension...... 3.00

FOX COMBAT SPECIAL FOX 60 EAGLE Bore ...... 907 Weight ...... 15oz. Stroke...... 937 RPM with 11-7 Vi prop ...... 12,000 Displacement...... 604

A lthough schneurte ported engines generally

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tion still h as quite a bit going for it. A baffle type

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hot baffle which m ore thoroughly atom izes and

vaponzes the fuel. A baffle engine is also m ore

econom ical to produce U nless you are power

hungry and prepared to shell out substantial

quantities of m oney for an engine and fuel the

Fox E agle 60 m ay be your best bet. Of all the

baffle 60s on the m arket the E agle is probably

the m ost pow erful and certainly on e of the m ost

e c o n o m i c a l For 1979 the Fox E agle has m any significant

refinem ents The whole crankcase lower end

h as been enlarged to provide heavier w all sec­

tions and clearance for a m ore sturdy rod W e Bore ...... 800 have developed improved machining Stroke...... 715 techniques and now the crankshaft bore is step Displacement...... 359 bored to provide a close fitting seal area forward of the carburetor and absolute concentncity with

Weight...... 8 oz. the front bearing. The port section and aft is bored larger to provide shaft clearance. The problem RPM with combat pro p...... 18.000 of heat sag which w e had on som e earlier E agles has now been com pletely elim inated. The new

First introduced in the sum m er of 1976. this new Fox C om bat crankcase also features bosses on the front and rear of the m otor which m ake the m uffler attach­ m ent easier W e no longer install exhaust valves except on special order as m ost people use a Special w as an im m ediate success It won first place at the m uffler w hich m akes the exhaust valve unnecessary. The crankcase is now bead blasted which w e think A m encan N ationals and the C anadian N ationals, and first p laces

at m any contests throughout the country W henever the C om bat gives a very pleasing contrast to the polished head

Sp ecial w as dow n it w as obviously laster than the rest of the field and rear cover and the black hardw are. If you have

A suction type restnctor and needle valve are included with the to work tor your m cney. you should take a long

m otor. This suction ventun m akes the C om bat Special a surpns- hard look at the Fox E agle

m gly docile m otor for beginner type profile airplanes A s m od­ eler's skill p rogresses and h e w ants to go faster, he will b e able to 16099 Fox Eagle for C . L ...... $59.95 sw itch from the suction intake to bladder type and this w ay the 26099 Fox Eagle for R /C ...... 69.95 sam e m otor will progress right along with Ihe m odeler from the 90232 Conventional Silencer...... 9.95 first profile m odel up through the fastest com peitition type com bat FOX 90303 Tuned Muffler ...... 24.95 m o d e l s MANUFACTURING CO. 13700 Fox Combat Special ...... $49.95 5305 TOWSON AVE FORT SMITH ARK 72901 PHONE 501-646-1656 90412 Vi" Prop Extension ...... 3.00 JACK S HOBBY CRAFTS WHITTIER, CALIFORNIA'S HOBBY SUPPLIER FOR 26 YEARS NOW OFFERING MAILORDER SERVICE AT P.O. Box 1342, Whittier, California 90609

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John Gottschalk Westburg (see ad). We also have an excel­ North Knoxlield lent 24x34 inch cutaway perspective draw­ Victoria. Australia ing of the same 'Lakes, done by Nick ΒΙβ FLEET A launch every 50 seconds . . . very Karstens. Prints are available from us at interesting. Please have Mr. Learmontsend $3.50 postpaid. · us more information on his automatic line retrieve system! Also, send us photos of that first 1/4-scale airtowing operation. Fuel Lines. . . . Continued from page 15 Heaven help us if we ever become govern­ seen, but since it is the one which comes ment-subsidized. That, like British TV, is the with the 8000 engine, I included it in the only way we could stay in business without advertising. In the meantime, we'll try to tests. After about two hours of running, keep our continued articles as unbroken as tweeking and taching, I came up with 36 Wing span Λ j fj Cå f i r the figures shown in the accompanying 20 P o u n d s j? * / ' ' · */*J possible. chart. You can draw your own conclusions CONCEPT MODELS Mr. Northrop I am more or less a novice in radio control, from the statistics, but in selecting a BOX 7335 Madison. Wl. (608)2710355 having/ust completed my second Ugly Stik. but prop for control line racing, my experi­ I really want to go to the 1 /4-scale aircraft ence has been that a four-inch pitch is What I need is some help or guidance in the best place to start your individual operation in Australia within a lew weeks. finding plans, drawings or documentation so I tests with your plane, engine, and fuel. Since early 76 I have also developed an can build a 1/4-scale Great Lakes The exact diameter, pitch, and compo­ interest in power llying, particularly pylon Any advice ol yours would be greatly appre­ sition of the prop which is best for you ciated. will depend significantly upon density racing. Hall-A and 1/4-midget are really my Thank you, favorite classes, and I lind Jim Gager and Larry Skip Porterfield altitude, your engine, fuel, and the Renger with their contributions extremely Houston. Texas weight and drag of your plane. So, get interesting, not to torget Dr. Larry Foget and his P S. I really enjoy your line magazine Keep up out there and do a little practicing and excellent articles on R/C soaring testing. In closing I certainly hope that you will keep the good work. up your good work and maintain the present You couldn't do better than to pick up a Assuming you’ve done that, and that ratio ol ads/articles Many ol my lellow set of Pete Westburg's plans for the Great you and your buddy have practically modelers turned away trom certain other model Lakes, as featured in our Dec. '77, Jan. '78, perfected the pit stop, what kind of magazines due to "over-advertising ." and Feb. '78 issues. Order direct from Pete times should you be getting for a three-

ALWAYS AVAILABLE AT YOUR HOBBY DEALER Photo by Bob Hoeckele - Flying Models Magazine HOT STUFF WORLD CHAMPIONSHIP - NEWS! C/L STUNT WORLD CHAMPION - BOB HUNT KNOWS “ HOT STUFF” IS FAST - LIGHT & STRONG! Dear Bob & Bill: Had to write to tell you how pleased I am with the performance of “HOT STUFF”. In Control Line Aerobatics, weight and alignment are very critical. “ HOT STUFF” is VERY LIGHT and allows critical joints to be bonded instantly, insuring nothing moves, once perfect align­ ment is achieved. “ HOT STUFF” is also great for “tack” gluing blocks onto the fuselage for carving. All in all, it seems, “ HOT STUFF” is the IDEAL "STUNT MAN’S BOB HUNT ADHESIVE". Control Line Stunt WORLD CHAMPION

SATELLITE CITY - P.O. Box 836, Simi, CA 93065

106 R/C MODEL BUILDER pit, 100-lap race? Well, anything under six minutes is very good. A 5:30 is great Presents three new Peanut Scale Kits In two great and should win just about anywhere. M IC U d K i series: Super Light Indoor and Outdoor styles However, I'm gonna go out on a limb and predict that we’ll see around a five- Both series feature minute time in the not-too-distant Color Coded Labels * Printwood! Auditorium Green-indoor kits future. * 18" Stripwood! At about this point, I usually get a Sky Blue-outdoor MICRO-X PUTS EXCELLENCE * Light Colored Tissue! couple of requests that in essence say, K'ts IN YOUR MODELING!! “ Fine, but how about telling us exactly SHOWN IN PIC * Catalog $1.00 what fuel, plane, and prop you use?" OK Piper J3 Cub! guys, here it is. In Class I Scale racing, I fly Stinson 125! a Falcon Special. The plans are available Piper Vagabond! from Model Airplane News, No. 198 Sherry! 1/2A Goodyear Racer, 11/74. In Mouse race, I fly my own design Lil’ Rodent. It’s available in kit form from hobby shops EACH $4.25 t Mlcro-X Products or mail order direct from Kustom Krafts- P.O. Box 1063-A manship. For fuel, I use 40Vi, nitro- At Your Dls/Dealer Now!! Lorain, Ohio 44055 methane. 40% methanol, and 20% Klotz KL-100. My prop is made of fiberglass. It is left hand, and has a 4-3/4 inch diame­ escape out the exhaust, as happens in ter and 4-1/2 inch pitch. Each one is the two cycle type. Operating one of A. J. FISHER INC. these little jewels, such as the O.S. FS-60 individually molded, since they are not M anufacturers o f q u a l i t y commercially available. If I had to use a is a real pleasure, one that is difficult to S c a l e B r a s s S h i p a n d Y a c h t commercial prop, I’d start with either a express in words. The scale-like sound in F i t t i n g s S i n c e 1 8 2 5 5x4 or a 5-1/2x4. My engines are exactly itself must be actually heard to be P l a n * - F i t t i n g s - K i t s - B o o k s as described last month. That’s about as appreciated. No muffler is necessary, ILLUSTRATED CATALOG, $1.50 straightforward as possible. Good luck. and I have heard normal conversations Oops, almost forgot, build light. Rocks take place next to an engine going full don't win races. throttle (10,000 rpm). On the low end I Until next month . . . Have fun, and have seen these engines idle at 1,100 race well. · rpm on glow and approximately 700 rpm on ignition. These observations BERNHARDT have been with an O.S. FS-60 running on a sturdy test stand. Vibration is at an • For the past forty-odd years, model absolute minimum, while fuel con­ builders have enjoyed the availability of sumption will have to be seen to be miniature combustion engines as a believed. Seven to eight minutes per source of power for their model air­ ounce of glow fuel can be expected, ZIP - 48067 planes, boats, and cars. Manufacturers swinging a 14 to 16-inch prop, and on of these engines were numbered by the gasoline, 15 minutes or better per ounce from backfiring. When starting an en­ hundreds, each competing for the is not uncommon. Some models have gine equipped with ignition, starting modeler’s dollar. All were based around only a one-ounce fuel tank when is done in theconventional manner with the same design; the two stroke cycle, equipped for ignition operation. When the ignition points set in the full advance differing basically only in the intake starting a model four cycle engine on position. Once positioned for maximum valve design and materials. To be sure, glow, it is necessary to flip the prop in a performance, the ignition points are some were more efficiently designed clockwise direction to keep the engine locked down and all speed control is than others and enjoyed a longer span of manufacture. The Brown Jr., Super Cyclone, and Ohlsson engines are prime 1979 CANNON MINI-SPORT R/C SYSTEM examples of fine design and workman­ ship that have enjoyed a good reputa­ 1 tion throughout the years. Many ad­ The only PRACTICAL RADIO * vances have been made over the years in that expands with your needs! both materials and design, so that today’s .60 will develop eight or more Available from 2-channel (dry) times the power than the engines of the Golden Era were capable of. In the old ($129.95) to 5-channel days, the lightness of the engine was a Deluxe ($274.95). All great selling point; today, you never hear it mentioned. systems may be con­ Until recently, the only engines avail­ verted up to 5 channels. able commercially to the modeler were of the two stroke design. These fire once 28 PAGE COLOR BROCHURE for each revolution of the engine. Today ON WORLD'S SMALLEST we also have available engines of the SUPERLIGHT DIGITAL R/C four stroke design, which fire once for EQUIPMENT-50c every two revolutions of the engine. The principle of operation of these four (S I.50 FOREIGN) stroke (or four cycle) engines is identical to a modern automobile engine having CANNON the intake and exhaust valves located in DEALER DISCOUNTS AVAILABLE SEE R/C SYSTEMS the cylinder head. The efficiency of four Í 7 YOUR DEALER OR ORDER DIRECT. cycle engines is greater than the con­ 13400-26 Saticoy Street ventional two cycle engines because the North Hollywood. Calif. 91605 SHIPPING $3.50 (U.S.A.). raw fuel is not mixed with the exhaust (213) 764-1488 C A LIF . RESIDENTS ADD SALES TAX gases. Also, the incoming fuel cannot

AUGUST 1979 107 1- 800- 428-4682 CALL TOLL FREE

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.49 59" SP STEVE MUCK'S Little Dolphin MILE HIGH MODELS 6-1/4 LBS. R L is t:...... 34.95 Save 35% P-68 Victor SALE:...... 24.47 JEROBEE DELUXE NO. 167 DAE SERIES IV L is t:...... 36.95 8RIOI KAOS Electric Porsche 6 Cell POWER PANEL SALE:...... 25.87 L is t:...... 66.95 Car w/Radio L is t:...... 34.95 SALE:...... 43.52 li s t : ...... 249.95 SALE:...... 23.42 Save 35% SALE:...... 187.47 Save 35% Save 35%

OS 60 FSR R/CW/MUFFLER L is t:...... 129.95 SALE:...... 84.47

K&B 3.5ce INBOARD INOY FILM MK II AIRTRONICS CADET MIDWEST ENGINE Opaque matches K&B Epoxy. Twin Stik Trainer L is t:...... 36.95 L ist-...... 69.50 Save 35% White, orange, yellow, black, SALE:...... 24.02 L is t:...... 49.95 SALE:...... 45.10 blue. Corsair blue, bright red. SALE:...... 32.47 List: Per ro ll...... 7.98 SPECIAL: 3.99AI-3 rls - 9.99 Save 35% Save m Save 35% Save 35%

INDY YUASAGELL CELL 1 -2 Volt 6 AMP L is t:...... 29.95 SALE:...... 21.95 CUSTOM CHARGER K8t8 7.5cc (.45) R/C L is t:...... 19.95 SONIC TRONICS INBOARD MARINE SALE:...... 15.95 FUEL PUMP RACING ENGINE COX READY-TO-FLY 2 -4 Volt No. 250 L is t:...... 120.00 Save 40% Cub Trainer w/Radio 6-1 2 Volt No. 1250 Save 35% SALE:...... 78.00 lis t : ...... 99.95 L is t:...... 15.95 SALE:...... 69.97 SALE:...... 10.37 Save 37% Save 30% Save 30%

CURARE 40 All Balsa L is t:...... 90.00 SALE:...... 58.50 Save 30% TOP FLITE HEAT GUN OREMELNo. 381 COX HydroBLASTER L is t:...... 29.95 With Full Accessories L is t:...... 72.95 READY TO RACEW/RAOIO CALI. SALE:...... 20.97 SALE:...... 43.77 L is t:...... 111.00 TOLL FREE SALE:...... 77.70 COX 4 CH. MEDALIST SERIES RADIO L is t:...... 449.95 1-800-428-4682 Save 30% Save 37% SALE:...... 283.47 MRC LEOPARD TANK Save 30% Prices subject to change L is t:...... 174.98 without notice SALE:...... 122.49

INDY R/C SALES, INC. 10620 N. College, Indianapolis, In. 46280

$1.50 handling on all orders. Prepaid domestic orders postpaid, DELUXE SULLIVAN MRCTRANS AM foreign orders allow S10.00 (excess refunded). Orders · check, M. 0. OS 10 FSR R/C STARTER ELECTRIC CAR W/RADIO or C.O.D. Also. BankAmericard, Visa, or Master Charge (bank L is t:...... 36.95 L is t:...... 41.95 L is t:...... /2.95 number). Indiana Residents add 4% Tax. SALE:...... 25.87 SALE:...... 26.43 SALE:...... 51.07 P r o ROD NYROD Su-Pr-ROD MASTEROD S IE R O D - X F

The Leader in ADVANCED Push-Rod Systems PLAINFIELD. ILLINOIS 60544 done with the carburetor. A lower idle may be obtained by retarding the spark, THE CUSTOM TUNED ENGINES but in my opinion, 700 rpm is slow I II enough for any practical purpose. SAFETY-SPINNER AND COMPETITION Installing an ignition system on an ACCESSORIES O.S. .60 four cycle engine is a delightful HUB and rewarding experience, providing Specialists in standard you exercise care and take pride in your or throttled Cox .049/.0S1 work. None of this business of using a lightweight and Rossi .15 engines, machine bolt as a lathe arbor while polished· parts Λ quality racing products. turning the timer seat on the crankcase For detailed information, or filing the ignition cam into the aluminum aluminum prop drive washer, as recom­ send 15 c stamp to: mended in a recent article in another Kustom Kraftsmanship model magazine. These are exacting operations, requiring machine tools and "FLY SAFELY P.O. Box 2699 a knowledge of how to use them. If in Laguna Hills, CA 92653 doubt, give the job to someone who can HARRY a HICLEY A SONS, INC. do the job right. A good conversion of a (714) 830-5162 433 AROUILLA OR GLENWOOD ILL 60425 glow engine to ignition operation can­ not be accomplished using the hammer- and-tongs methods of the blacksmith IN STOCK FOR IMMEDIATE SHIPMENT era. The care and thought you put into it R/C World . .. Continued from page 11 will be evident when you fire it up for QUADRAS 99760 the first time. stencil set, 12 sq. ft. of sign making QUADRA REPAIR · $10.00 plm parts Used in radio control models, these material, inflation hose, and repair kit, ZINGER & TOP FLITE Props - 10% OFFI engines, operating on ignition, will are priced at $1795, $2295, and $2495 Jim Messer's ERCOUPE KIT · $196.00 present the same problem of electrical respectively. The four fins inflate with BARK LEY'S TIGER MOTH- $249.95 interference to radio receivers as their the blimp and have no moveable CONCEPT'S BIG FLEET KIT- $179.95* two cycle cousins. Some receivers are controls. (* 6" Du-Bro wNs, a $15.95 value, more sensitive to ignition noises than The vinyl/thermo, helium-filled bag FREE with kits bought from us) others, and the only sensible solution is can be merely tethered 150 feet or so 1/4-SCALE PLANS (for Quadra) to install a transitorized ignition system above the ground, or a complete R/C STEARMAN BIPE, ERCOUPE (T.I.S.). I haven’t seen an R/C system yet Gondola with two 12-volt electric drive $20.00 par set. that would not operate reliably when motors can be used to fly the blimp by 24-Hour Service. .. Add $2 00 postage. the engine was equipped with a proper­ radio control. Employing the same Send Bank Check or Money Order to: ly designed T.I.S. unit. There are a few system proven by tests at the Pasadena JIM M E S S E R 'S good units available on the model record trials, directional control is QUALITY MODEL PRODUCTS market today, or you can build your provided by pivoting the motors up, 106 Valley View Dr„ own, as described by Tom Bristol in the down, left, or right. Forward, stop, and ____ Allegany, NY 14706 May 76 issue of Model Builder, and I reverse complete the motor controls. A urge you to try one. It may solve all your 16 oz. water ballast tank can be emptied should be interesting. problems. a little at a time to compensate for NSRCA BRITISH STYLE So far I have mentioned only the O.S. helium loss. The Great Britain R/C Aerobatic .60 four cycle engine, which probably is The Gondola is 42 inches long and Association was formed with the help of the most popular on the market today. includes the two electric prop driving Geoff Franklin around the first of the Coming on strong is the KALT .45, the motors mounted on outriggers. With year. Geoff is President and News Editor. SAITO .30 and the SAITO .15, all beauti­ complete radio system installed, charg­ Nev Holmes is Chairman, Sue and John fully designed and built. Also, O.S. is ers for radio and drive motor batteries, Robinson are Secretary and Treasurer starting to produce a 1.20 twin opposed, etc., the Gondola is priced at $1195. respectively, Chief Judge is Bill Timlock, while KALT has displayed its .90 twin If one of these blimps isn’t soon and Tom Isom heads up Public Relations. opposed. The DAMO 1.20 opposed written into a TV “ Mission Impossible” First thing we noted was that the twin from Sweden is a beautiful ex­ type adventure story, we’ll be quite British R/C Aerobatic team has been ample of fine craftsmanship, performing surprised. selected. A familiar name from previous every bit as well as it looks. Now, if you Incidentally, Bob Peck has promised World Champs is Dave Hardaker. The installed points on one and replaced the us an article about the design and devel­ others, who we believe are on the team glow plugs with spark plugs. .. · opment of his commercial blimps. It for the first time, are Martin McIntosh

AUGUST I979 109 PIERCE AERO COMPANY PRESENTS

COMPLETE KITS WITH PRECISION CUT PARTS ALL HARDWARE FULL-SIZE PLANS

"RIDGE RAT" - S39.95 "PARAGON" - $69.95 49" span Slope Sailplane PIERCE 118" span Thermal Soarer Area - 436 sq. in., Wt. - 32 oz. Area - 1080 sq. in., Wt. - 48 oz. Wing Loading - 10.6 oz/sq. ft. AERO CO. Wing Loading - 6.3 oz/sq. ft. 9626 Jellico Avenue, Northridge, California 91325 Phone (213) 349-4758

and Ken Binks. Nev Holmes, GBRCAA Chairman, is the Team Manager. MOTOR MOUNT řLI d ř 9HIRTC We’ll see you all in Johannesburg. LUG South Africa, September 24 through 29. ON-BOARD GLO BATTERY INSTALL Wanna really dazzle your R/C flying buddies by walking up to your airplane, OPTIONAL grabbing the fuselage in one hand, and TOGGLE propping the engine into life with the SWITCH HERE other? Give ’em a bad time. Let ’em think you’ve switched to a diesel. But don’t tell ’em you’ve simply wired a small on-board starting battery, through ME AND MY KC a push-button, right on to the engine’s 4 COLOR glow plug. (EXCLUSIVE RIGHTS Why bother to install an extra battery FROM ROYAL CROWN COLA) in your plane just to surprise a few Your choice plane friends? Well, it also has a practical use. boat car on poly FLI CAP By paralleling the push-button switch ester/ cotton T-shirt with a micro-switch mounted on your With throttle servo, you can kick on the A M A W IN G S A M A W ings battery in low throttle, keeping the plug 4 COLOR hot and improving your idle. The latter (PERMISSION FROM AMA) idea was tried years ago to improve idle $6.50 reliability, but was not popular because Size S, M, L, XL + 50« Postage small, high capacity, rechargeable bat­ teries didn’t exist, and replacing pen We do custom work tor clubs, cells after one or two flights just didn’t special events, businesses hack it. Information sent on request. The idea for this idle/starting battery installation was revived by Jack Minch in the Blue Angels (Bronx, New York) řLI dř 9HIRT9 newsletter, as copied from the Middle Tennessee R/C Society Newsletter, as 5132 DEL REY · LAS VECAS, NEVADA copied from, etc., etc. (702) 878-1624 89102 The push-button is mounted so that it naturally falls under your thumb or APPLIED DESIGN CORPORATION 738 Penn St. MINI GLUE TIPS El Segundo. CA 90245 MAKES ANY GLUE TUBE åv AN "INSTANT GLUE GUN" MINI SANDER PUT THE GLUE WHERE ADJUSTABLE TENSION YOU WANT ITI HAND BELT SAN DEB • Saab with a pin FIRMLY HOLDS PAPER i ' • Na hraa M IW ALL 22 GAUGE OR FOR EASIER SANDING • Na mail tt clean 4lar99c \^LAFLARGER HOOK-UPWIRE & • Padded llm and curvea • Handy M HMd M IN I wfes SAW 94.55 J4 55 • EaaytoUaa $1.59 COMPACT 10 Inch HACK SAIN SAINS ANYTHING. ANYWHERE index finger when you hold onto the MINI-STRIPS PRECISION DIE-CUT Medium Garnet fuselage while cranking your engine. SAVES TIME REPLACEMENT Fina Garn« Sa» has nrggad da-cast trama artth ANO EFFORT $1.05 SANDING BELTS Aiat d WaMr Preel comfortable. chip-pnot plastic la- The micro-switch is adjusted so that the sail handle Rocadlag nese and ad- throttle servo arm closes the switch piataNo 6" blade ghrts goad »ork S t g y z J F B y SI .98 accost Cats wood, plastic, maul, contacts when the throttle is in about its KEEP EVERYTHING end HARDENED MUSIC lowest position. A charging jack can also IN PUCE - NEATLY WIRE. TMa melded plastic organiser Hay la be installed, if you want that many Mul M Inf toots and parts clean and M IN I-SAW BLADES 3 Mr $1.05 gadgets sticking out of the fuselage, or LJfjij Kandy — on benet), tablo or In Olo you can merely use alligator clips to held Groat whiM yta bedd or tako FINE TOOTH REPUCEMENT HACK SAW SLADES (S toe*) things apart. TEMPERED tar cutting HARDENED MUSIC WIRE connect the charger to the battery. Be

110 R/C MODEL BUILDER sure to remember to keep your throttle out of the low position when the en­ gine’s off, or install still anotherswitch in the lead to the grounding lug (see wiring CARR SAILS diagram). · 7608 GRESHAM ST. Plug Sparks. . Continued from page 42 was primarily due to the list of events S P R IN G F IE L D , VA. 22151 being taken from the trophy list. In past STANDARO ON AU. CARR SAILS years, Bob Boucher and Joe Beshar have Finest American-made D AC RO N sailcloth Vinyl, press-on numerals and Insignia sponsored R/C and 020 F/F Electric Heat sealed edges eliminate fraying events respectively. This year, Bob Coaled, stainless steel iibstay installed Rolled-edge grommets in lack, clew A head Boucher offered to sponsor both. Natu­ Bolt-rope mains'l luff mast attachment rally he was a little upset when the Santa Barbara . $30 00 10-Rater $30 00 events did not appear on the entry East Coast 12-Meter $30 00 50/800 (M-elass) . $30 00 36/600 $25 00 Internat A-class $35 00 sheets. West Coast 12-Meter $30 00 Star 45 $30 00 For the electric power fans, both Vanguard J ' boat $40 00 T&A Petrel $30.00 events will be held on Thursday, the last Scale vessels, special purpose boats, one-of-a-kinds Wnte lor a quote, and lor our day of the Champs. The R/C O.T. Elec­ 197 9 Brochure and Used Sails Ust. tric event will consist of 1-1/2 minute motor runs with seven-minute flights, three flights to decide the winners. The Free Flight events will be a shade differ­ ent this year, as Joe Beshar will not be available to run them. The 020 Electric F/F models will feature 25-second motor runs with 5-minute maxes. Three flights determine the winner. (These are the same rules as used at the 1977 Champs in Las Vegas.) SAME! Yes it is SAM, but still not quite the same (no pun intended). Dave Baker has been heavily promoting Old Timers in England and an English Society of Antique Modelers Chapter (SAM 36). Over 100 members have succumbed to Baker’s efforts. The club has become so large that they are now the official group have arranged tb hold their meet on plus a printout of Flying Aces. As Dave for Old Timer flying in England. September 29 and 30 at the American puts it. a promotion to propogate the The latest letterhead from Dave has AFB at Sculthorpe, in Lincolnshire. species. Wild!! the same logo as SAM, but has been Baker reports there will be all the ONLY THE GOOD DIE YOUNG modified to SAME, Society of Antique trimmings traditional with the SAM It is with considerable regret that this Modelers (England). How about that? Champs, i.e.. bean feed, special events columnist announces that his good Baker has been so successful that they like the Sheelds Twin Pusher events, etc. have decided against holding the Eng­ friend, Bob Reuter, died of a heart attack Some of the American boys have sent on April 18 at the tender young age of 51. lish SAM O.T. Champs at the Nationals. some of their models to be proxy flown! This was brought about because the The group has organized and char­ He first suffered a massive heart attack English governing body, S.M.A.E., de­ tered a 747 for next year’s SAM Champs on Saturday morning. April 7, at the cided to split the Nationals into three in the USA. With 108 members, they MECA Booth at the Toledo Weak Signals parts, one being 150 miles away! The should have no problem in filling the R/C Show. He was given immediate British site was totally unsuitable from required 200 seat quota. Talk about an attention and taken to a hospital. He SAME viewpoint, miles from anywhere, active group!! appeared to be doing quite well and was and worst of all, completely away from Their latest promotional stunt is to scheduled for release when he suffered all public exposure. augment the official SAM publication, another attack. Despite all efforts to save With this in mind, the English boys SAM Speaks, with an English version him, this one proved fatal on the 18th. CESSNA

P erhaps you need som ething a bit out-of-the ordinary tor scale com petition? O ur C essn a 182 is a big,

stab le airplan e; ideal as a scale trainer on only a

.40 engine. Put a .60 under the cow l and fly circles around

the com petition. The sem i-sym m etrical airfoil m akes

the 182 groove, yet It’s a s do cile a s a kitten. For

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for p leasan t ground handling. The kit is all-b alsa, w ith

lots of hardw are and m olded parts for speedy construction. The clear plans and sp ecial illustrated construction booklet

m ake it a kit that anyone can build. Kit features: Span: 72", 2657 N E 188th Street A rea: 702 Sq.", 5-7 lbs. flying w eight, 4 ch ann el. P ow er: .40 to .60 M iam i. Florida 33180 Telephone 935-1436

AUGUST 1979 111 the SAM 7 boysareavidly promoting the Authorized- F A CT O R Y A U T H O R IZ E D S E R V IC E O.T. Towline Glider event. According to FOR ALL OF THE FOLLOWING BRANDS their argument, there is no questionable (Radio rubber to argue with, no gas engine Ace* Cannon Cirrus EK Logictrol propeller to get chewed up with, and Opntrol Pro Lin·* Math at* RS* Micro Avionics best of all, it is truly a clean flying sport. Royal Orbit D & 0 World Engines SAM 7 uses the pre-1942 ÁMA Tow- s e r v i c e Simprop Kraft* Jo Mac line Glider rules, which require no more than 100 feet of towline. However, quite •ALSO WARRANTY SERVICE a few of the fellows wanted to fly Nordic gliders in this event, and a compromise EXPERT SERVICE ON ALL BRANDS was finally effected: all pre-Nordic (1948) gliders will be allowed to fly in the Don McCarthy · Factory trained technicians with over O.T. Towline Glider event. It will be 15 years in Radio Control Electronics. interesting to see if this will help swell the entry list. Hours: Closed Sun & Mon; Tues - 10 am—8 pm; Wed — Fri - 10 am— 6 pm; Sat · 10 am— 2 pm Jack Whittles, SAM 7 livewire, advo­ cates the use of pre-1942 gliders, as he (714)639-8886 915 N. MAIN ST., ORANGE, CALIFORNIA 92667 finds they are real performers, case in point being a Jasco Thermic 70. Jack has As Vic Didelot sez, “ A more friendly, could fly another person’s model if he volunteered to make up a list of eligible congenial, and all-around nice guy felt he could do better and had the price pre-1942 towline gliders. Let's hope he never lived.” of the entry fee. shares the wealth with us. We’d like to promote the event too!! ELECTRIC SPARKS With the waiting between charges (generally 15 to 20 minutes), this gives MECA GRAND NATIONAL This time our title sez what it means, COLLECTOGETHER no Plug Sparks, but truly good flying many of the competitors a good chance Great news! Just got confirmation electric powered Old Timers! to see what is going on plus enjoy from Dick Dwyer, MECA District 2 This latest fad is starting to catch on meeting all the other boys. If you Coordinator, that the MECA (Model real big in California, particularly with thought the regular Old Timers were low-keyed affairs, you should try an Engine Collectors Association) Grand the R/C Old Timers. To keep up with the National Collectogether will be held in times (and satisfy the membership), a electric meet for just plain out-and-out conjunction with the SAM Champion­ contest was projected for March 31 at a fun. You don't have to be an expert to ships in Salt Lake City. This is something new flying site, the large grassy greens of thoroughly enjoy yourself. many SAM and MECA members have Gilroy High School. The meet suffered only onedrawback. The rains had made the grass grow so been asking for ever since the last one at lack Alten, a real electric enthusiast, the Champs in 1975. volunteered for the thankless job of lush, the 2-1/2 inch diameter wheels simply wouldn't roll! Hand launching Many of us, including the writer, are Contest Director and what a job he did, eagerly looking forward to this Collecto­ complete with original plaques. It truly was the order of the day. Here’s what the fun looked like: gether. Dick Dwyer will head up the was a shame it rained all week, thus National Collectogether and will be scaring off the expected contingent 1) Larry Horaček (Playboy)...... 900 2) Don Bekins (Playboy)...... 899 working closely with Mark Fechner. The from Southern California. As it turned Collectogether will be held on Monday, out, one could not have asked for a 3) lack Alten (Playboy)...... 895 4) Ted Kafer (Playboy)...... 814 July 23, beginning at 9:00 a.m. and better day. With warm weather, very wrapping up at 5:00 p.m. On this day, little wind,and thermals galore, it was no 5) Don Anthony (Playboy) ...... 693 6) Steve Roselle (Quaker)...... 437 the SAM Bean Feed, the MECA Annual wonder competition was so tough. Meeting, and the Collectogether will be Actually, in an electric contest such as SAM SALLIES In the recent Yankee Flyer newsletter. held at the Ramada Inn. So, now is the this, the accent was on fun, as anyone time to write Dick Dwyer, 1837 Flood Dr., San Jose, CA 95125, and let him know if you intend to display your SAIL CONTROL WINCHES engines. You can’t start too early on this. Dick would appreciate hearing from you. ANOTHER GOOD GUY. . . This month’s write-up is beginning to look like an obituary column. Just received the sad news from Francis Kastory that his brother, Paul, age 50, died of a massive heart attack while in bed. Paul leaves 3 children, one age 24, one W -1... $59.00 W-2 ... $119.00 a junior in high school, and the other a sophomore in high school. His brother, • Custom R/C design for all boat sizes »Power - 40 in. lbs. »Travel Francis, says that all will carry on as Paul time - 5 seconds »Voltage - 4.8-6 (W-1) »Size -2x2x5 inches. would have wanted. The Probar W-1 is mechanically operated by a separate, neutralizing CIA INFORMER servo. The Probar Propo W-2 is designed to plug directly into the receiver, Harry Murphy, newsletter editor of and requires no extra batteries. Specify Kraft, Futaba, or no connector. the CIA Informer, emblazons a headline Both winches are fully assembled and tested, ready to install. AH mounting to the effect that “ COFFC Inks W-P for Nine Dates.” Maybe that doesnt’ sound hardware, switch pushrod (W-1 only), and winch arm blank are supplied. like much to you, but Dick Smith, the STAINLESS STEEL HARDWARE: MISCELLANEOUS ITEMS: COFFC spokesman and diplomat ex­ Turnbuckles, Chainplates, Goosenecks, Sheet exit guides, 3owsie, traordinaire, has again turned the trick Boom vang pivots, Pad eyes, Tangs, Rudder posts. Mast head in getting the Wright-Patterson AFB Deck cleats. Boom cleats. Rigging wire, fitting, Dacron sheet line. officials to allow model contestson their Dealer inquiries invited. field. PROBAR D E S IG N P.O. BOX 639 ESCONDIDO, CA. 92025 This has in itself been responsible for a

112 R/C MODEL BUILDER tremendous resurgence of free flight activity in the midwest states. The Cen­ tral Ohio Free Flight Club is to be JOHN POND commended for its excellent work in resparking free flight in their area. The best part of it all is that COFFC Old Time Plan Service shares its wealth with the rest of the clubs, assigning dates to the Central The largest selection of plans in the world at the most Indiana Association and other Ohio reasonable prices. Each list 75c clubs such as NOFFA, etc. This generous outlook is ideal for encouraging all fliers No. 10 OLD TIMER F/F GAS to come and enjoy themselves. That is No. 10 OLD TIMER RUBBER/TOW LINE the name of the game . . . FUN! No. 10 OLD TIMER FLYING SCALE A through K LATEST FLASH As we were wrapping up this column, No. 10 OLD TIMER FLYING SCALE L through Z we received the news that Russ Barrera had finally succumbed to that dread P.O.Box 3215 disease, cancer. Russ made his final San Jose, Calif. 95156 flight as of 12 noon. May 8, at the Good Phone (408) 292-3382 Samaritan Hospital in San Jose. Russ will be remembered by many for his untiring efforts in organizing the A NEW ERA PUBLICATION Flightmasters into a flying scale club that AEROBATIC AIRPLANES has reached national and international BY ROB'T. C. MORRISON a s PAGES ------SS PHOTOS prominence. Many of the best known IS DETAILED DRAWINGS contributors of flying scale designs are SCALE DATA from or still active in the Flightmasters. SOFT COVER During the last 10 years of his life, only S 3 . 9 5 p l u s sod: p o s t a g e Barrera dedicated all his time to the formation of a true Model Airplane PIPER J3 CUB Museum. His efforts were outstandingly successful. Russ left no stone (model) ANOREASON unturned in his effort to present a proper chronology of model flying from its earliest starts in the United States. His death leaves a large gap in the National Model Airplane Museum lo­ cated in Morgan Hill that will be hard to Can't Ignore This. HEPLA-TECH replace. We will have more on this in AecA-Myrners P O BOX 2491 -MB IN T E R N A T IO N A L M C. future issues. LA MESA. CALIF. 92041 MIC KENZIE HWY. PHONE (714 469 B675 or (7141 442-4634______/ WHAT2IT LOOK LIKE? VIDA, OREGON 97ΑΒΒ______Many readers have written in com­ Our recent column proposing an old plaining that they don’t know what a His comment on the event is simply, timer CO 2 event, as outlined by Dick particular model looks like. Bob Lane, in " It’s great!” Lidberg scaled down Sal Tanis, brought forth some comments, Taibi’s Powerhouse some time back and a recent letter to this columnist, has the best being from Al Lidberg of volunteered to act as a source. had it published as a construction article Tempe, Arizona. So from now on, fellows, write to in the September 1978 issue of M. A.N. Al Robert E. Lane, Jr., 836 Sycamore, Lake Al states we (the columnist and Dick) feels there should be no restrictions on Jackson, TX 77566. Bob has promised are incorrect about the standard size of model size or airfoils (keep things that he will advise you of a source, the tanks supplied with Telco motors. simple, like the .020 Replica event). The sy>pJy a picture if possible, or if avail­ The standards are 3.75 cc. not 6 cc as problem of limiting the motor to a stock able, a two-or three-view drawing of the stated. Possibly this might be the Shark Telco or Shark with stock tank pretty model. tank, but Al feels it must be about the well defines the size of the model. On Bob is to be commended on this labor same size as the Telco. He has used a 6 cc the Powerhouse. Al didn’t bother with of love. If you do write, try to remember tank in scale models with a Telco motor scale undercamber, feeling there to enclose some decent postage money. and has gotten quite reasonable flights wouldn’t be much effect with such a C02 REVISITED with heavier models. small chord. He still wonders if you

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AUGUST 1979 113 ing the major components. The model MARINE VERSION was the last of a four-part series of th e remarkable i beginner’s models, starting with a hand- launch glider, then a simple all-sheet Quadra i g n i t i o n e n g i n e stick rubber job, then an all-sheet full- Ě J m ^uadra “ fuselage rubber model, and then the Tiger. Why the model’s name was changed is anyone’s guess, unless the MADE IN CANADA magazine people wanted to convey the idea that the model was designed espe­ cially for that four-model series. world distributor Old Timer fanatics who go so far as to and developer: duplicate the original model’s color R. Shettler Ent. scheme might want to make an excep­ new! tion in this case. The Challenger was P ottery Road R-R 3 painted ivory, with gray-orange, gray- Vernon, B.C., C anada V IT 6L6 now available green, and blue-black camouflage. Not Telephone: (604) 542-4151 (all hours) recommended as the best color scheme for locating a lost model! . ·

Counter.... Continued from page 9 BUILDING and how they work, different methods of charging, how to wire the circuits, how to mount the motor and batteries, motor speed control, gearing, propeller BIG? selection, what to look for when choos­ MA Y WE HA VE THE PLEASURE OF QUOTING ing a model for electric power, how to YOU ON A CUSTOM MODEL AIRCRAFT CON­ pick a size of F/F or R/C model for a VERSION OF YOUR OWN BIG ENGINE? particular size motor, separate sections A CATALOG OF OUR PRODUCTS on boats, cars, and helicopters, sources IS AVAILABLE FOR ONLY S1.00 for plans and technical data, etc. The book consists of 70 pages and should 77 P R O D U C T S answer just about any questions the 17119 S. Harvard Blvd. active or potential electric flier might Gardena, C A 90247 have. No devotee of electric power should be without one. Phone (213) 329-4863 (PLEASE CALL AFTER 7:00 pm. PST) Bob’s book should be available in most hobby shops by the time you read this, or order direct from Astro Flight, Inc., 13377 Beach Ave., Venice. CA 90291. Retail price is $5.95. * * After producing an entire line of electric R/C car and tank kits, MRC- TELCO/ Tamiya is coming out with a 36-page, full-color book on how to get the most The Flight Proven out of your electric car. It describes the basics, suggests how to set up race courses, describes the do's and don’tsof C 0 2 Motor R/C electric car racing, and offers tips on how to get the most performance out of * RELIABLE your car. The book also describes all the MRC-Tamiya R/C car kits and displays them pictorially. There is also a trouble­ $ 1 9 5 5 shooting guide for quick service. The MRC-Tamiya R/C Car Guidebook From A L L good Hobby Dealers looks like about the most complete guide to R/C electric cars available. You can get a copy for $1.50 from MRC, 2500 could tell the difference in flight with engine and donate the model to boot. Woodbridge Ave., Edison, N) 08817. such small models? Lidberg winds up his At that, after having seen the Power­ comments with the observation that if house fly, Boyer exclaimed, “ I’ll lend we make the event too restrictive, who you a motor, what kind would you like?” will fly it? More fun! · Bob “ I Hate Details” Morrison, of Repla-Tech International, was kind Toconcludethings with a littlehumor, enough to give us permission to men­ Al was at the 1978 Southwestern Re­ Challenger .. . Continued from page 42 tion his new book as many times as we gionals flying his C02 Powerhouse for wanted, even letting us put it on the fun. The model was making some very As an interesting side note, the Chal­ cover if we liked! Gee, thanks, Bob! realistic flights, rising off the asphalt and lenger was actually published twice, but Bob’s book-is called AEROBATIC flying in a smooth power pattern. About not under the same name. In addition to AIRPLANES: Participants in the IX World this time Larry Boyer of San Diego came the 1941 article, the model was featured Aerobatic Championships. It consists of over for a look at the fun. Lidberg in the 1943 Air Trails Annual and was excellent 3-view drawings (complete explained he had borrowed the motor called the Tiger. The plans and text were with color schemes) of the aircraft that from a friend to check out the possibili­ identical to the 1941 version, except that flew in the World Champs, plus a draw­ ties of CO 2 Old Timers. The arrange­ one of the photos was replaced by an ing of the Stolp Acrodusler II. for a total ment was that he was to return the exploded drawing of the model, show­ of 18 drawings. Bob attended the meet,

114 R/C MODEL BUILDER ADVERTISERS INDEX CLASSIFIED ADS Ace R/C, Inc...... 97 Non-commercial (personal items) Rale is 25 cents per word, with a minimum ot $3 00 American R/C Helicopters...... 72 Commercial Rate is 40 cents per word, with a minimum ot $5 00 No mail-order discount Applied Design Corp...... 110 Astro Flight. Inc...... 95 house ads knowingly accepted No advertising agency discounts allowed Authorized Radio Control Service ..112 All ads are payable with order, and may be tor any consecutive insertion pettod speolied Barron's Scale Classics...... 101 Name and address tree, phone number counts as two words Send ad and payment to Bavarian Precision Products...... 97 MODEL BUILDER Magazine. Classified Ads. 621 West 19th St . Costa Mesa. CA 92627 Bridi Hobby Enterprises...... 73 Byron Originals ...... 118,119 Cannon Electronics...... 107 STARTER CORDSET glowplug to battery GLASS CLOTH 0 6 oz 38” wide, continuous Carr Sails...... 111 30” tangleproof. insulated clips — $1 89 length. 5yds.S11 75.10yds S21 50 Add S 75 Cloudbuster Venture...... 101 Razor blades, single edge industrial quality — postage, handling R/C Consultants. 11809 Concept Models, Inc...... 106 100 S3 75 200 S6 75 300 ' S9 75 COBBIE'S Fulmer N.E.. Albuquerque NM 87111 Coverite...... 98 GIFTS Box 2 Deal New Jersey 07723 Cox Hobbies...... 69 WANTED Old-Time spark-ignition model Craft-Air, Inc...... 77 airplane motors magazines and gas powered Jim Crocket Replicas...... 102 PEANUT/GRAPENUT Catalog Send stamp Du-Bro Products. Inc...... 85 Fokker E-1 Gee-Bee R-t Geep. SBD Daunt­ race cars of the 1930's and 1940 s Russell Stokes Rt 1 Box 73J Keller, TX 76248 Eastcraft Specialty Products...... 96 less. Davis DA-2. Fike E St 00 ea Aero Era. Empire Models...... 92. 93 11333 N Lake Shore Dr Mequon. Wl 53092 FA I Model Supply ...... 95 FORSALE M AN magazines Send SASE tor A.J. Fisher. Inc...... 107 list Bob von Koňsky. 5543 Drysdale Dr. San Fli Shirts...... 110 MODEL YACHTSMEN Proportional conver­ Jose. CA 95124 Ph 408/266-9796 sion of any sail control unit R C " Flyline Models...... 94 spinnaker control "R C ' genoa Plans Fox Mfg. Co...... 105 ELF "4" Complete with plugs and original coil $2 each, all S5 Rainbow Box 796-MB Futaba Corp. of America...... Cover 2 set Operating Best offer over $1200 Write Westbury. NY 11590 Harry Higley & Sons...... 109 16552 S E 28th, Bellevue. WA 98008. Hobby Shack...... 91 Indy R/C Sales ...... 108 Jack's Hobby Crafts ...... 106 which took place last year in Czechslo- kit, of course). J & Z Products ...... 100 vakia, so his drawings should be the last Pica's new Jungmeister is a really J.V.S. Products...... 117 word in accuracy. In addition, the book attractive model and is well worth J-5 Enterprises...... 117 Jomac ...... 68 includes sections on the history of waiting for. If you’d like to learn more K & B Mfg. Co...... 1 aerobatic competition, an explanation about it. write to Pica Enterprises, Inc., K & S Engineering...... 74 of the Aresti maneuver diagrams, results 2657 N.E. 188th St., Miami. FL 33180. Kraft Systems, Inc...... 3 of the IX World Champs, specifications * * * Kustom Kraftsmanship...... 109 of the airplanes flown there, and an Jim Messer's Products...... 109 Williams Brothers is coming out with interesting writeup on the history and Micro-X Models ...... 107 yet another 1/32-scale plastic display kit. Midwest Model Supply...... 89 development of each of the aircraft intended to complement the excellent Mini-Marine Racing Equipment ... 111 shown in the 3-views. The book makes Model and Allied Pub...... 100 Gee Bee racer kit released earlier. It’s Model Engineering of Norwalk...... 88 for extremely interesting reading and is the Wedell-William Racer, one of the well worth the $3.95 it costs. Model Merchant...... 70 most successful of the Golden Age air Model Rectifier Corp. (MRC) .. Cover 4 To get a copy, write to Repla-Tech racers, and which managed to win or Walt Mooney Peanuts...... 103 International, 48500 McKenzie Hwy., place in the top four in seven different Sid Morgan Vintage Plans...... 111 Vida. OR 97488. events at the 1932 Cleveland Air Races. Steve Muck Boats ...... 98 * * * Bud Nosen Models ...... 75 They were flown by such noted racing Octura Models ...... 98 Two-winger buffs will look forward to pilots as Roscoe Turner, Jimmy Wedell, Orline ...... 99 the eye-catching stand-off scale Bucker and James and Mary Haizlip. Pacer Industries...... 94 Bu 133 Jungmeister that Pica Enterprises The Williams Brothers kit includes all PanaVise Products ...... 103 is due to release late this year. Not much of the parts and decals necessary to Peck-Polymers ...... 113 Pica Models...... 111 information is available yet. but accord­ finish the model as any of the following: Pierce Aero Co...... 110 ing to the press release that was sent to Number 121 “ Gilmore Red Lion.” Num­ John Pond O.T. Plans Service ...... 113 us. the total wing area is 1035 sq. in., ber 44 “ Miss Patterson.” or Number 92 Probar Design...... 112 ready-to-fly weight is about 7 lbs., and it “ Miss New Orleans.” The builder has a Pro Line ...... 102 uses a .40 to .60 size engine. The struc­ choice of two types of landing gear and Quarter Headquarters...... 104 Radio Control Buyer's Guide...... 84 ture is all wood with a molded plastic two types of wheels (hard or flexible RAM R/C Models. Inc...... 113 cowl and wheelpants (included in the tires), and special flat monofilament is Repla-Tech International...... 113 Rhom Products...... 86 Satellite City ...... 106 MOVING? SEND NOTIFICATION FIRST! Scientific Models...... 79 ^ Attach old label here J Attach old label here 1 R. Shettler Enterprises...... 114 Sig Mfg. Co...... 5 NAME \ 1 Southern R/C Products...... 90 OLD Oba St. Claire...... 98 ADDRESS ADDRESS The Steamfitters...... 4 Sterling Models. Inc...... 71 (PI«*» Print) CITY \ STATE ZIP \ Su-Pr-Line ...... 109 Telco ...... 114 L Attach old label here / Ύ Attach old label here Top Flite Models. Inc...... 87 Tower Hobbies...... 80. 81.82. 83 NAME Uber Skiver Knives ...... 120 NEW VL Products...... 104 ADDRESS ADDRESS Chas. Werle...... 97 Peter Westburg...... 101 (Please Print) CITY STATE ZIP World Engines ...... Cover 3 77 Products...... 114 Change of address notices must be received one month before date of issue that new HOUSE ADS address takes effect For prompt service, old label MUST be attached. Post office will Classifieds ...... 115 not forward copies unless you pay extra postage Duplicate issues cannot be sent. Oldies but Goodies...... 76 Plans Service...... 116 T-Shirts ...... 78 MODEL BUILDER, 621 West Nineteenth St., Costa Mesa, Ca. 92627

AUGUST 1979 115 FULL SIZE PLANS SERVICE No. 4793 PELICAN $2.50 No. 12782 COUPE DE PLASTIQUE $2.50 Including reprint of construction article Far out, but well-tatted F/F pusher can­ A provon conto« winner with tube futo- ard flying boat, .049-.09. Jim Fullarton. logo end plonic propl Horry Stoinmotz. (if any) No. 479-O.T. TLUSH MITE $2.50 No. 1278-O.T. THE "TRIANGLE" $2.50 From May 1938 Air Trails, a 4' span gas Roro Antique designed by Ehling. Used No. 8791 SNEAKY PETE $6.50 modal for Atom (I) engines. Frank Tlush. OÄR 23, 1/2A with R/C. B. Shulmen. Contemporary .61 pattern ship. Howard Pete lines, fixed dual gear. Dich Hanson. No. 3791 OUSTER $6.00 A 7/8 size “ Big John" biplane for .61 en­ No. 11781 TRAVEL AIR D4D $7.50 gines and 4-channel R/C. Bill Northrop. Accurate 2-inch R/C scale model of fem- No. 879-O.T.-1 CURTISS F-11C-4 $4.00 ous Golden Ere biplane. By Bill Seidler. Reprint of Miniature Aircraft Corp. plans plus ribs and bulkheads from printwood. No.3792 MYSTERY $3.50 No. 11782 PAZMANY PL-4A $4.00 Compact 64" span aerobatic R/C slope Jumbo rubber scale model of VW power­ soarar for 2-channel radio. Al Patterson. No. 879-O.T.-2 CHALLENGER $3.50 ed homebuilt. 56" span. Leon Bennett. Easily-built Class B gassie w ith 50" span from May '41 A ir Trails. H.A. Thomas. No. 379-O.T. PRIVATEER $6.00 STICK 'EM PATTERNS Very clean cabin design from Sept. '38 M.A.N., 87" span. By Thracy Petrides. Complete sets of pressure sensitive patterns provide "printed wood” . . . on your stock . . for selected MODEL BUILDER plans. Press No. 7791 TURNER SPECIAL $9.00 No. 2791 GROSS VOGEL II $7.00 all patterns for ribs, bulkheads, tips. etc., on Roscoe’s famed Thompson Trophy racer Large (1700 sq. in.) plank-type R/C fly ­ proper thickness sheet balsa or plywood, in 2 " = V R/C scale. Col. Bob Thacker. ing wing. .19 to .60 eng. Charles Clemens. and cut 'em out! No tracing, no transferring, no plans tearing, no inaccuracies. Just like No. 7792 PERCY $4.00 No. 2792 CLIFFHANGER $2.50 making up your own kit with printed wood. Pulse-rudder slope glider uses panty-hose R/C slope soarer quickly built from Ace foam wings, 54" span. By Larry Ranger. "Stick 'em Pattern” numbers correspond to egg/pod fuselage, 68” span. Jack Headley. plan numbers. Order w ith plans and they'll No. 2793 STORMHAWK $2.00 be mailed together . . 3rd Class. Add 654 Sleek, 26" low wing sport rubber ship, per set to mail patterns 1st Clast. No. 6791 CAP 20L-200 $10.00 reminiscent of late '30's. John Morrill. Fully aerobatic large-scale low winger for CALIFORNIA RESIDENTS ADD 6% TAX. 2 cu. in. or red.-drive engines. Jeff Tracy. No. 2794 HALF-A SCALE RACERS $2.00 No. 6792 LONGSTER $3.00 Two-for-one plan with 'Little Mike' and No. 11731SP BIG JOHN the FIRST $6.95 F/F or R/C 1-inch scale (30" span) cutey 'Shoestring' ukies. Jim & David O'Reilly. No. 574-O.T.SP T-D COUPE $2.95 for CC>2, .010, or rubber power. Le Gray. No. 674-O.T.SP RED ZEPHYR $3.95 No. 279-O.T. S/S PUSHER/CANARD $2.00 No. 6741SP TRIXTER BEAM $2.95 No. 679-O.T. VALKYRIE .020 $3.00 Single stick, 32" pusher/canard rubber No. 774-O.T.SP OUT Ό SIG HT $2.45 Build this .020 Replica of Carl Goldberg's ship from '33 M.A.N. By Harry Edsall. No. 7741SPCURTISSA/12 SHRIKE $3.95 famous soaring gas model. Rudy Calvo. No. 874-O.T.SP POWERHOUSE $3.95 No. 1791 DFH-21 $4.00 No. 91074-O.T.SP BUHL PUP $4.95 Smaller FAI pattern ship for .15 power No. 5791 DFH - 20 $7.50 No. 1174-O.T. SP LANZO STICK $1.95 by top Swedish flier. Bengt Lundström. Latest FAI pattern ship by top Swedish No. 11743 SP "C-QUELL" $3.95 flier. Has built-in pipe. Bengt Lundström. No. 1792 MAC'S "ROBOT" $5.00 No. 57 6 0 .T . SP MERCURY $3.95 Famous R/C Aircraft Series, No. 3. First No. 775-O.T. SP BOMBSHELL $3.25 No. 5792 DORNIER Cs 20 $2.00 published in 1951 AM. Fran McElwee. No. 277-O.T. SP BERLINER JOYCE $5.25 Contest-winning CO2 scale free flight. It No. 3771 SP WACO UPF-7 $5.50 takes off water every time. Walt Mooney. No. 4771 SP "MÍSU ARPIEM" $3.25 No. 1793 LITTLE BIT $2.00 No. 577-O.T. SP GLADIATOR $4.75 No. 579-0.T.TAYLO R C flAFT $10.00 Super-mini 24" stunter will fly on up to Quarter-scale in 19411 Famous 9-foot de­ 35' lines with Cox .010. Randy Heydon. Price includes 3rd Class postage and reprint sign kitted by Miniature Aircraft Corp. Of building innructions (if any). Add 654 No. 1794 A V IA TIK 0-1 $3.00 PER PLAN for 1« Class po«age. Add $1.00 No. 4791 HOLLY HAWK $3.50 Rubber powered scale model of WW-1 Scale-like shoulder wing sport model for PER PLAN for overseas orders (except APO biplane fighter, span 26". Bill Noonan. end FPO). Complete plans list 354. 3-channel R/C, .19 eng. Mike Hollison. CALIFORNIA RESIDENTS ADD 8% TAX. No. 4792 PETREL $5.00 No. 12781 GRUMMAN AG-CAT $11.50 MODEL BUILDER PLANS SERVICE Mammoth 2-1/2'.' R/C scale biplane, for Rugged, competitive R/C sailplane with 621 WEST NINETEENTH ST. 100" or 2-meter wing options. Jim Ealy. 2" engines. Span 7.5‘ . Floyd Fitzgerald. COSTA MESA, CALIFORNIA 92627 included for the wing and tail rigging. sumption of about 2/3 oz. per minute. For more information and prices, send The W edell-W illiams racer kit is So what are the advantages of a diesel 25c and a SASE to Davis Diesel Develop­ recommended for experienced mod­ engine? Well, first off, the fuel is cheap, ment, P.O. Box 141, Milford. CT 06460. elers and should be available at hobby especially when compared to the price dealers everywhere, or may be ordered of glow fuel nowadays. There are no direct from the factory. Retail price is glow plugs or starter batteries involved Parma International is marketing $5.95. From Williams Brothers, Inc., 181 . . . a further savings in cost. Also, and some new items that will be of interest to Pawnee St.. San Marcos, CA 92069. this is especially good in the case of scale all 1/12-scale R/C car maniacs. First off, models, a diesel produces more torque there are two Lexan car bodies. One is than a glow engine, so you can use a the Capri, the full-size version of which Bob Davis has done it again! Now. in bigger prop for a more scale-like ap­ has been doing quite well in races in addition to his well-known Davis Diesel pearance, and since the engine is run­ Germany over the past year; the other is Conversions for the Cox .020, .049, and ning slower, it sounds more scale-like, the "Kroll,” which is claimed to be the .09 engines, there are conversion kits too. sleekest aerodynamic Can Am type body available for the Fox .15 BB Schneurle, The new Davis Diesel Conversions now on the market. As we said, the K&B 3.5 cc, S.T. .35. O.S. ,40FSR.and the include everything you need to convert bodies are molded from Lexan; anyone O.S. .60FSR. To give you an idea of how your glow engine to a diesel. As far as who is active in R/C car racing knows these engines perform, the O.S. .60FSR is installation is concerned, all that’s how tough this material is. Both bodies claimed to turn a 16x4 prop at 10,000 required is to replace the old cylinder can be purchased unpainted (clear) for rpm, idle down to 1800 rpm, and is said head with the Davis head. . . should take $9.95, or painted for $14.00. to put out 1-1/4 hp, with a fuel con- about two minutes at most. Parma is also introducing a complete

116 line oř 1/12-scale racing tires, called I suggested he try to take off that “ Crabbers." They’re available in soft to morning, as the ground was in good medium grades and retail at $2.75 for condition and the wind was light. He MAMMOTH fronts and $3.00 for rears. Lastly, Parma agreed to try and proceeded to fuel up STINSON VOYAGER has a speed control resistor for 1/12- and start his engine, an OS 25. After a ONE QUARTER SCALE scale electric cars, and is available with few fuel feed problems were overcome, 1/2, 3/4, 1, or 1-1/4 ohm ratings. Each then a glow plug battery connector one will give a different degree of problem, and a fair amount of prop dynamic braking, so you can pick the cranking, Ralph got the engine going. one that best suits your car and your He went through the normal proce­ $89.50 driving technique. These resistors will fit dures; hold the nose up, fine-tune the Reg. 99.50 most of the 1/12-scale electric cars needle, go through the throttle range, currently on the market. etc. With the engine all tuned up, he You can find out more from Parma taxied out on the strip, lined up the International, Inc., 13927 Progress Park­ airplane, with some coaching, and gave way, North Royalton, OH 44133. · it full throttle. Everything looked pretty good and then it happened . . . ground Workbench . .. Continued from page 6 loop. He tried again . .. taxi, line up, full throttle, ground loop. He tried time and one of our "Fuel Lines” editors, and time again until we concluded it looked president of Aldrich Products, Edinburg, like a lost cause . . . the plane just Wing Span 101.75" Length 73.75" Texas, has discontinued all of his Mag­ needed a bit more practiced hand to get Designed For Quadra Engine num fuel containing over 10% nitro. airborne. So he taxied back, shut off the Approximately 20 lbs. Finished weight Also, because of increased production engine and refueled. He then fired up vacuumed Formed wheel Pants & costs, George has decided to market his again and handed me the transmitter. Fairings included. V» Diameter fuel directly rather than distribute Little did he know that I had only flown Landing Gear through Carl Goldberg models. This Old Timers before and this was to be my change is strictly a matter of economics first experience with a “ real” R/C PLYWOOD & SOFTWOOD and has been mutually agreed upon by airplane, so to speak. Unlike my Com­ CONSTRUCTION both parties. The name has now been modore, which lifts off in about 30 feet at changed to Magnum Plus instead of half throttle, that trainer accelerated like KIT BY ART LANE Magnum Power. Magnum Plus Sport a freight train. When it finally lifted off it lists for $10.95 per gallon, and Magnum took up-trim to stay airborne. Anyway, I Plus Piped lists for $15.95. For further got it up to a safe altitude and gave the Ontario Residents add 7% P.S.T info on his fuel, contact George at Box box to Ralph. He proceeded to have a Dealer inquiries welcome 817, Edinburg, Texas 78539. grand time flying around for about 15 CORRECTION TIME minutes. He got about a quarter of a mile l+ l J-5 ENTERPRISES |*| Jim Newman, whose International away at one time and I thought he might P.0. Box 82 Belmont, Ont. Scale Plan Service will be written up in lose it, but he didn't. He brought the Canada next month’s “ Over the Counter” , ship back and put it into a shallow dive; N0L1B0 indicates that we erred in identifying the when the engine began to wind up he D.H. Vampire ducted fan as being got a bit concerned, leveled off, and 1 - 519 - 644-0375 designed by Nick Ziroli. Nick did build continued cruising around. the model, but it was designed by Jim Finally, the engine ran out of fuel and while he was still with Midwest Products. he gave me the box to dead-stick back JVS CLAIM JUMPER Nick built the model his own way in. We got back down in one piece and A Fiberglass Masterpiece however, with cut expanded polysty­ Adam went to pick up the ship. If rene foam. anyone wonders why I didn’t land the DETERMINATION PLUS ship right in front of our feet, the reason Bob Oslan brought us the following is simple . . . I ain’t that good a flier. story, and we can just about guarantee Anyhow, I noticed that while Adam was that you’ll read most of it twice. walking back, Ralph was playing with I was at Cal Poly University airstrip the sticks. I asked him if he was checking waiting for a friend to show up for some something out, as Adam was still about Sunday flying when I happened to meet 75 feet away when Ralph started playing JVS SPORT 40 a couple of Poly students with similar fiddle sticks, and wasn’t holding the A Consistant Winner in plans. My friend didn't show for one plane so that it could be easily seen for .Oval Course Competition reason or another, so I joined the two control movement. Ralph replied that young men. Their names are Ralph he was trying to listen to the servos. Council and Adam Abrego . . . both How’s that for hearing? This guy could Californians. Ralph is a flier; Adam was be a submarine sonar man just by pit crew that day .. . he had dorked an putting his ear to the hull. As a matter of airplane some time ago and was ac­ fact, if his hearing wasn’t so good he cumulating the desire to try again. He couldn't fly that R/C ship at all .. . be­ unloaded the car while Ralph busied cause Ralph is blind! That’s right kiddies, Manufacturers of the World's finest himself putting the wing on his R/C I may not be able to spot-land, but I can fiberglass Model Hydro planes trainer (rudder, elevator and throttle). I spell B-L-l-N-D. Ralph Council showed H r f f Send 25« or stamps for catalog me what independence, guts, and deter­ don’t know how long Ralph had been IF & 0 JVS Products, flying, but it was apparent that he had a mination are all about; he's got enough 39292 Spanish Bayonet, problem with takeoffs and landings. His for an army. He regrets that he’s not able JVS 'V PRODUCTS Box 452, Anza, CA 92306 ship was a tail dragger, and a ground to build; I’ll bet he’d be some competi­ loopy one at that. He said that he had tor if he could. managed to take off a tricycle geared Ralph, I hope you're not too embar­ trainer once, but the tail dragger had rassed by this, but those of us who feel him stymied. Normally, he said, some­ sorry for ourselves or complain about one else took off and landed for him; he our problems should meet one helluva didn’t do too bad in the air. man. ·

AUGUST I979 117 Quick-Build BYRON ORIGINALS Exact Scale Precision 4’* Complete Byro driven pulley Drive, w/prop J ensures vibre spinner, only 21 tion free service lbs. Less than one year ago, Byron Originals introduced its Pitts Special with optional Byro-Drive reduction unit. We Unique engine made some pretty strong product claims and were more mount offers than ready to back them up. We have since learned, from wide range of positions for actual applications by customers both in this country and locoting engine a nd exhaust overseas, that the Pitts and drive unit have far exceeded equipment ben­ our own ratings. Whether it be packaging, overall parts fit, eath cow l ease of assembly, fidelity to scale, flight performance, 2 0 x 8 maple Beit tightener prop end 3%" materials quality, overall appeal or completeness, these offers easy spinner included with Byro-Drive. firsts from Byron Originals have firmly established a new Precision pulleys adjustment for designed and optimum per standard of excellence for the entire modeling industry. matched for peak formance and Tensiometer ind­ performance extended belt icates exact No one will agree more than the proud and satisified recommended Pitts and Byro-Drive owner. He'll be the first to recom­ belt tension for peak perform mend a Byron Originals kit for your next project. And you once and belt can count on him giving you a long list of reasons why. longevity Poly-Flex* V We suggest you take his advise and look to Byron bolts-proven af Originals for the newest and most intriguing concepts in ter years of tool Factory Direct Price shop applications recent modeling history. You'll agree it's like a breath of requiring up to 20.000 rpms fresh air. Prop. & Spinner Inc. The Proven with Order Byro-Drive model number for matching engine. Model No. for Engine MFR-10- .60 & .65 O.S. Max. frt. & r. valve RR-11- .61 & .65 Rossi, rear valve RF-12- .61 & .65 Rossi, front valve WFR 14 .61 speed Webra, frt. & r. valve TFR-13- X.60 Supertigre, Wing Span:68 frt. valve, r. Wing Area: exhaust 1400 sq. in KF-15- .61 Kraft Length: 62" HPFR 16 Silver Star or Gold Cup. frt. & r. valve OPSR-17- OPS .60 Speed, rear valve

Factory Direct Price

.Pilts K ills) at $188.00 ea. plus $8.00 shipping Fibcrglassing kit(s) at $36.00 ea. plus $2.50 shipping Byro-Drive(s) Model No.______(See chart at 1 plus $2.50 shipping. Mig-15 kills I at $168.00 ea. plus $8.00 shipping Foreign Inquiries contact: Fiberglassing kills) at $22.50 ea. plus $2.50 shipping Exportations. I.td. (Iowa residents add 3% sales tax.) 17835 Sky Park Circle Suite E Name Irvine, Calif. 92714 — U.S.A. Address

□ 1 have enclosed check or money order (or $_____ Weight: ready-to-fly. Ujkfuel □ Please charge to Master Charge or Visa Account. •Under 15 lbs. withVronokote finish. Master Charge #. Expires. Visa». Expires. •Under 17 lbs. with Epoxy/Fiberglass (Prices subject to change without notice) finish. Send to: Byron Originals. P.O. Box 279, Ida Grove, Iowa 51445. Includes ALL ITEMS to Kits... complete models as shown! Engine, radio, and final paint not in clu d ed BYRON ORIGINALS

Wing Span - 57 " M iG -15 Lenght - 5 5 ” Ready-to-fly w t. - 8 Ά lbs. Wing area - 600 sq. inches For .60 size engines and 4 channel radio The First Practical Approach to Realistic Jet Performance That: • Is designed (or the average R/C en­ thusiasts. • Allows short grass strip take-offs • Offers fast and easy starting without having to remove and assemble hatches. • Eliminates complicated belt-start procedures • Readily accepts most standard .60 size engines • Does not require high nitro fuel for satisfactory performance • Arrives factory installed (standard equipment) and ready for engine. With factory installed • Produces up to 8 Ά lbs. of static thrust w ith Schnuerle .6 0 and low nitro fuel. * Quick Assembly Scale Accuracy Easy Access to Radio and Engine

Unlike other quick-build kits that often sacrifice authentic detail for fast assembly, Byron Originals has kept both authenticity and simplicity high on the priority list. All die-cut The ducted fan with exclusive wood parts and 11 foam components needed for completion quick-start capabilities. are designed with quick assembly, scale accuracy and minimized weight in mind. All foam modules consist of light­ weight yet impact resistant injection molded polystyrene. Fuselage consists of hand-layed fiberglass and arrives with fan unit, thrust tube, radio compartment and push rods already installed. All decals and color scheme templates also included. All control surfaces utilize center point hinging requiring standard servos. Every last item, except radio, engine and final paint are included in kit. No shaping or carving required. No extension provided with kit. guesswork involved. Only quick, accurate and enjoyable Add $8.00 for building. shipping to any Optional epoxy/fiberglass kit for glassing wings and tail sur­ U.S. address. Items $168.00 faces available for $22.50. shipped by United Parcel Service. Factory Direct Price IN THE BEST CIRCLES, ITS ttber skiver'

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, • Deeply Knurled, Non-Slip Grip and 2 0 ...... $14.95 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. All direct orders sent postpaid in U.S. PRODUCTS California residents add 6% sales tax. 621 West Nineteenth St. Costa Mesa, California 92627 Fewer MRC-Enya engines are for everyone. We’ve got power outputs that range from ,2HP to 1.7, (even without a tuned pipe), and engine sizes from .09 to .60. All to cover the needs of the beginner, Sunday flier and the expert. Reliability Special Flying Season It's a legend with MRC-Enya. Our engines are out there season-after-season, Sunday-after-Sunday, doing their job and doing it well. And that’s because they're made better to last longer. For instance, the hand lapped, matched piston and cylinder assembly used in many MRC-Enya engines is just one example of why our engines run on and on and on. Hand Prices reduced on all lapping is an expensive and slow process. But it yields the best, cleanest, lowest leakage fit between MRC/Enya Engines piston and cylinder. And that spells reliability.

Versatility See your hobby dealer MRC-Enya engines are available in a broad variety, while sale lasts! including marine and U-Control versions. Some are basic cross flow ported loop scavenged engines, others are our complex Schneurle ported, high performance “ X” type. Whatever you need, from U-Control to helicopters, from pattern planes, to Deep Vee boats, whether your interested in competition or Sunday sport... let MRC-Enya be your guide for engines that are built to last. See them at your hobby dealer.

MRC-Enya sport llyers hand lapped engines with bronze bushings MtC-Enya’s Max. HP less Max. HP less muffler RPM muffler RPM .09 III .2 8,000-16,000 .19 VI TV .36 2,500-14,000 .09 III TV* .16 2,500-13,000 .29 B IV .8 9,000-17,000 Sunday .15 IV .33 8.000-16,000 .29 B IV TV* .5 2,500-13,000 .15 IV TV .28 2,500-14,000 .35 B III .8 8,000-16,000 .19 VI .42 8,000-16.000 .35 B III TV* .6 2,500-13,000 flier’s guide MRC-Enya Schneurle ported engines— ballbearing supported shafts and G type carburetors Max. HP less muffler RPM .19 X TV .55 2,500-19.000 .40 X TV 1.2 2,500-17,000 .45 X TV 1.3 2,500-17,000 .49 X TV 1.3 2,500-16,000 .49 X TV .49 X TV Helicopter 1.3 2,500-14,000 .60 XF TV 1.7 2,500-16,000

MRC-Enya engines with ballbearing supported shafts Max. HP less muffler RPM .19 VI BB .46 8,000-18,000 .19 VI BB TV .40 2,500-16,000 .29 IV BB .85 10,000-18,000 .29 IV BB TV'' .55 2,500-13,000 .35 III BB .85 10,000-17,000 .35 III BB TV • .65 2,500-13,000 .40 1.1 9.000-16.000 .40 TV* 1.0 2.500-15,000 .45 II 1.15 9,000-15,000 .45 II TV* 1.05 2,500-14,000 .60 B III BB 1.45 9,000-14,000 .60 B III BB TV* 1.3 2,500-13,500 .60 B III BB TV* TV-G8* 1.45 2,500-14,000 .09 III ‘ Also available in marine version. Tuned pipes and mufflers available separately. BB— Ball Bearing Model Rectifier Corp. / 2500 Woodbridge Ave., Edison, N. J. 08817 TV— Throttle Valve G8— Special Carburetor In Canada: 3440 Pharmacy Ave./Scarborough. Ontario. Canada M1W2P8 Like its full size brother the FMC cal obstacles up to 2", and take on a across-the-street. MRC-Tamiya's XR311, built for duty with the armed 45° incline with ease. XR311 is aggressive and built for the forces, this MRC-Tamiya 1/12 scale PRECISION ENGINEERED FOR road. Extraordinarily engineered fea­ replica was engineered to offer high THE HOBBYIST tures include proportional steering; a performance capability on-and-off Nothing has been overlooked in its 540 Mabuchi high power motor; two the road. It extends the mobility of design. A sealed transmission keeps forward and two reverse speeds; eas­ R/C wheeled vehicles into areas dust and grime off the gears. Run it in ily adjustable gear ratios 9.3 to 1; normally the province of tracked your yard, driveway, cross country or 16.1 to 1; 21 to 1; semi-pneumatic units, opening a whole new area of tires; posi rear end for sure grip; rug- challenge for the R/C car enthusiast. ed ABS plastic body; long lasting Unlike toy-type R/C cars, you'll derive Belrin gears. It gives you everything, a good deal of satisfaction from as­ power, control and reliability . . . on sembling this precision kit... and in and off the road. doing so you’ll be able to understand See it at your hobby dealer. It’s the it, service it when needed and enjoy it most versatile R/C vehicle ever made. as a hobby . . . because a toy it cer­ Accommodates dry cells or rechargeable nickel cadmium batteries. MRC two channel radio recom­ tainly is not. A ctual torsion bar suspension system along with mended. although any comparable two channel INCLINED TO BE operating, independent w ishbone suspension on radio is sufficient. Radio and batteries not included INDEPENDENT each w heel help you run on uneven terrain. Once assembled the superb en­ gineering becomes evident. You'll find actual torsion bar suspension which stabilizes all four wheels for © na taking on rough road environments. TAMIYA Operating, double wishbone, inde­ MODEL RECTIFIER CORPORATION pendent suspension on each wheel 2500 Woodbridge Avenue. Edison N.J 08817 allows it to move quickly, over punish­ In Canada 3440 Pharmacy Avenue, Scarborough, Ontario. Canada M1W2P8 ing, uneven terrain. It can climb verti­