MAY 1975 volume 5, number 41 REALISM YOU CAN RUN W ITH

SCALE R/C NEW - TUNA CLIPPER TC-37 Scale Model of the 220’ Purse Seiner, built by Campbell Industries. San Diego. 37” long. 6-1/2” beam. Plywood POWERBOATS construction with mahogany planking. Complete with deck hardware. A beautiful shelf model, yet rugged for R/C use with single or dual Dumas-Pittman motors. Lots of room for FROM DUMAS radio and specialty gear.

NEW - THE LITTLE SHELLY FOSS TU-24 A 24” scale kit of this popular tug. Lots of room for R/C gear and electric motor power. Plywood construction. Deck hard­ ware included. Also available in a 36" model. . . and as a 45" fiberglass hull model with die cut wood deck and super structure . . . for electric or steam power.

TROJAN CRUISER TR-31 Kit of 3 Γ Trojan cabin cruiser. Γ '= Γ scale. Rugged ply­ wood construction for gas or electric power. All deck hardware included. Excellent for R/C.

Take your choice, these precisely scaled kits are built for R/C boating, free running or shelf display. Each an exacting replica of a popular ocean going prototype. Pretty enough to put on display, sturdy enough to run, they’re just a few examples illustrating why Dumas’ scale and semi-scale model kits lead in helping you get the most out of your hobby. Now available: Pre-packaged hard­ ware kits with everything you need for running. A hardware kit for every model. dum as Props available. See Your Local Dealer. If He Can't Help You Write Us. COAST GUARD LIFEBOAT S-200 See your hobby dealer or send to o ls 50C lor our complete catalog 33" kit for exacting modeler. Includes deck hardware. Balsa Dumas Products. Inc. construction . . . display it, run free, or R/C with Dumas- 790 South Park Avenue Pittman electric power. One of the most popular scale models Tucson, Arizona 85719 ever kitted. New Sport Series Five Channel System

The KP-3/5 is a companion radio to the famous KP-5 Sport, combining top quality and high performance with many new features. It offers the security of flying Kraft at modest cost. • Compact, lightweight transmitter has excellent balance for better control.

Expanded battery voltage meter eliminates guessing battery life.

"Click-stop" trim positioning minimizes accidental changes. • New stick design is a composite of the open and closed gimbal types, combining the best features of both. • Control potentiometers are conductive plastic and have vir­ tually unlimited life with excellent resolution and accuracy. • Complete receiver-servo package mounts quickly and easily; has throttle reversing link. • Aileron or rudder selector permits either channel to be oper­ ated off of the righthand control stick without transmitter modification.

$279.95

\ \ * External block plug is provided for the addition of fourth and fifth servos (not included). • Wired charge receptacle is built into the bottom of the trans­ mitter to provide instant conversion from the dry battery to our new KB-8D rechargeable transmitter pack. • WRITE FOR FREE CATALOG Heavy-duty KB-4E battery pack is standard. Charge recep­ tacle is wired into the switch harness. Available now on 72 MHz and 27 MHz.

* 450 WEST CALIFORNIA AVENUE RAFT RO. BOX 1268-VISTA, CALIFORNIA 92083 K?SYSTEMS. INC. é World’s Largest Manufacturer of Proportional R/C Equipment ΈΜΟ TO /ILL R/C ENTHUS/ASTS EM'S WHY ÖUR '75 LINE IS MTHI BEST EVER! f,IA L L E N G E R SERIES NOW SPORTS ij/ HIGH-RESOLUTION SEMI OPEN \A L FOR SMOOTHER CONTROL —

YOU NOW HAVE A SLOW POLL BUTTON AND DUAL RATE SENSITIVITY SWITCH AT NO EXTRA COST IN THE COMPETITION SERIES /

B A CHOICE BETWEEN 1 5 DIFFERENT TYPES ' OF S E R V O S — PL U S <4 BATTERS OPTIONS— A NEW SERVO IS ON THE W A Y — MORE ON THIS LATER ! 1 MASHEEL TRIM LS ARE STANDARD / Μ· DUAL STICK / ITION SERIES — ROR EASIER AND Λ A N ALL-NEW STA N D A R D URATE TRIMMING! Ψ BATTERY CHARGER WITH S INDICATING LIGHTS-Υ Ο υ KNOW WHICH BATTERY IS CHARGING. WE USE LEDS (LIGHT EMITTING DIODES') FOR A IR B O R N E RECEIVER DECODERS ARE LONG LIFE DEPENDABILITY.1 CIRCUITRY — DOES AWAY WITH 16 ER CONVECTIONS— EXTENDS BATTERS' ÍAi/ΙΤΗ A LOW-LOW 7m a DRAIN ------E IN-FLIGHT RELIABILITY !

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MODEL AIRCRAFT INC., 1424 E. BORCHARD AVE., SANTA ANA, CALIF. 92705 TELEPHONE 714-8 35-77 88 MODEL AND CRAFT SHOW TWO BIG “ s t e t i o n DAYS MAY 3rd & 4th OVER 200 EXHIBITORS Indoor and Outdoor Demonstrations Radio Controlled Planes, Cars, Boats, Helicopters Gliders, Rockets and Plastics —CONTEST OPEN TO THE PUBLIC—) Over 57 Categories with trophies, awards and prizes in each category. NO E N T R Y FEE. Check local hobby or craft shop for details.

HOURS: SAT 10 A M - 8 PM SUN 11 AM - 6 PM Admission: 2.50 Adults 1.50 Jr. (under 18) Under 6 Free SAVE 50 ' WITH FREE DISCOUNT TICKETS AVAILABLE AT ANY LOCAL HOBBY SHOP

CONVENTION CENTER 800 W«gl Kotello Ave., Anoheitn, Colifornia NEXT TO DISNEYLAND

FLYING SITE: HILL COUNTRY TIME: AIR MUSEUM, MAY 17 & MORGAN HILL, 1975 CALIFORNIA 1STAnnual West Coast * * s · ^ Work) War IISCROMHE ^ . SPONSORED BY THE PIONEER R.C. CLUB of Sunnyvale, California ^ and MODEL BUILDER MAGAZINE

'J ^ A M A and SPORT SCALE . AMA ENGINE ^ ( NO BOM ) AT and WEIGHT RULES ☆ ...... C.D. - LOUIS DELAT EUR ...... INFO-PACKET and PRE-REGISTRATION FORM UPON REQUEST!!! Contest Manager- Eric Clapp, 6116 Castello Drive, San Jose, CA 95120 Phone No. (408) 997-2298

2 WHEN CONTACTING ADVERTISERS,TELL ’EM MODEL BUILDER SENT/H0OBL BUILDER MODEL S MAY 1975

BUILDER volume 5, number 41

1105 SPURGEON, BOX 4336, SANTA ANA, CALIFORNIA 92702 (714) 547-3963

STAFF CONTENTS

EDITOR FEATURES Wm. C. Northrop, )r. WORKBENCH, Bill N o r th r o p ...... 4 GENERAL MANAGER Anita Northrop OVER THE COUNTER, Bill N o r th r o p ...... 5

EDITORIAL ASSISTANT REMOTELY SPEAKING, Bill N o r th r o p ...... 14 Le Gray R 1C SOARING, Le G r a y ...... 22 ASST. GEN. MANAGER Dawn Garrott CHOPPER CHATTER, John T u c k e r ...... 24

ART DIRECTOR PRODUCT? IN U$E, Ken W o lf ...... 30 Paul Plecan PRODUCT? IN U?E, Charles Larkey ...... 32 SECRETARY STRICTLY SAIL, Rod C a r r ...... 37 L. Gordon

SUBSCRIPTION MANAGER F/F SCALE, Fernando R a m o s ...... 40 A. Valcarsel HANNAN'S HANGAR, Bill H a n n a n ...... 42

FREE FLIGHT, Bob S ta lic k ...... 46 CONTRIBUTORS R 1C AUTO NEWS, Chuck H a llu m ...... 50 Rod Carr Chuck Hallum PLUG SPARKS, John P o n d ...... 52

Bill Hannan CONTROL LINE, Jed K u s ik ...... 56 Jed Kusik Walt Mooney John Pond SCALE VIEWS Fernando Ramos CASSUTT MODEL 2, H arold O s b o rn e ...... 29 Bob Stalick John Tucker CONSTRUCTION

ADVERTISING REPRESENTATIVES 1930 FLEET, R/C SPORT SCALE, Romey Bukolt 8

WEST: Bob Upton, 20626 Clarendon Ave. SEA FURY, HALF-A PYLON RACER, Jerry Holcomb ...... 21 Woodland Hills, California 91364 (213) 884-2294 GREMLIN, HALF-A C/L STUNT, Tom D ix o n ...... 34 EAST: Walt Moucha, 605 3rd Ave., E. Northport, New York 11731 BLÉRIOT IV PEANUT SCALE, W alt M o o n e y ...... 43 (516) 266-3596 SCIENTIFIC MERCURY OLD TIMER, Phil B e r n h a r d t...... 54 Subscriptions $12.50 per year, $23.00 for two years. Single copies $1.25. Add $2.00 for postage per year outside of U.S. (Except APO). Add 75 cents for Canada and Mexico.

Copyright 1975 The MODEL BUILDER. Cover: Cliff Silva, Livermore, California, is an ardent Old Timer modeler. His interest, All rights reserved. Reproduction without and the models he builds, covers the full scope of the great ignition powered designs of permission prohibited. yesteryear; from the hot pylons, to the big, lumbering Texacos, to the colorful scale Published monthly by MODEL BUILDER ships. This photo, taken by John Pond at the free flighter's Mecca, Taft, California, Magazine, 1105 Spurgeon, Box 4336, Santa shows Cliff with his Page Navy Racer, built from Paul Lindberg plans which were pub- Ana, Calif. 92702. Phone (714) 547-3963. ished in POPULAR A V IA T IO N "a few years ago.” Second Class postage paid at Santa Ana, Ca.

MAY 1975 3 "Good Grief! The next thing you know, AMA'II start its own insurance company!"

•from Biti Northrop'* w o r k b e n c h · · ·

• By the time you read this, you will the constitution authorizes the Executive effect, if he doesn’t buy Model Aviation, have discovered that we are not alone in Council to make a decision (that AMA a commercial newsstand publication, our concern for the future o f AMA in will publish its own commercial maga­ that he cannot fly in AMA sanctioned the light o f the recent decision by its zine) without approval o f the member­ contests? Isn’t that against his Constitu­ leaders that the organization should at­ ship? tional rights? tempt to publish its own, fully commer­ Is it mandatory that a modeler take AMA says that most successful organ­ cial magazine. Industry leaders, model the magazine in order to join AMA? izations and associations have their own magazine publishers, and most impor­ Does he still have the choice o f a month­ major publications with advertising. How tantly, AMA members from all parts o f ly mailing only, or is he forced to buy many o f these journals are sold at news- the country, have issued letters strongly the magazine? Does this mean that, in Continued on page 76 protesting the financial and moral feasi­ bility o f the action. Recent Monthly Mailings and the latest Competition Newsletter are THE crammed with all kinds o f “ logic” to justify the magazine, and as expected, the model magazine publishers are the B.I.R.D. CLUB only ones being mentioned as objecting, with the “ sour grapes" reaction being PRESENTS played to the hilt. In fact, the frenzied presentation of "logic” and finger-point­ A CALIFORNIA FUN-FLY VACATION ! ing at the magazines puts one in mind o f HOST: B.I.R.D. Cub, Carson, Calif. WHERE: B.I.R.D. Field a cat on a tin roof trying to cover you- know-what. SPONSOR: MODEL BUILDER Magazine WHEN: June 28 - July 6 Rather than boring you with another long dissertation on the frailties of FEATURING: Unique trophies, patches, decals, trained judges, AM A’s arguments in favor o f publishing three B.I.R.D. host parties, fun for the entire family, and a its own model magazine, we’d like to casual contest atmosphere for beginners and experts alike. pose some questions for you to think about. Also, to help counteract the heav­ CONTEST EVENTS: Class A, B, Cn, Cx modified pattern. ily one-sided presentations in A M A’s Also Quickie 500 Pylon Racing.. (Flying on July 3, 4, and 5.) CN and MM, we offer you a well written and carefully thought out letter by AMA SPECIAL EVENTS . . . are being planned for Family, Fliers, member Dave Meier, of Middlesex, New and Wives. Check the ones that interest you. Jersey. If AMA is so convinced that it is FAMILY ACTIVITIES: FLIERS’ TOURS: doing the right thing, in spite o f the O Disneyland □ Kraft Systems many written and verbal objections, why O Knott's Berry Farm O Bridi Hobby Enterprises is it taking so much time and energy □ Busch Gardens □ K & B Manufacturing arguing with, and sounding o ff at, other D Magic Mountain (children's day) □ Orbit Electronics □ Queen Mary model magazines? Why bother trying to □ Marineland IF YOU NEED: explain, since i t ’s doing it anyhow? □ Universal Studios Camping, Motel, Airline, or other Why is AMA polling its members □ Awards Banquet information, please contact . . . about the Hutchinson deal, yet com­ Don Gutridge, 2401 Gondar Ave., pletely ignoring them on the magazine LADIES' DAY: □ Ports O' Call Long Beach, Ca. 90815 decision? □ Old Towne Mall (213) 596-3567 What specific by-law or section of 4 MODEL BUILDER OVER THE COUNTER

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• The aerobatic biplane bandwagon has a new member in the form o f a Steen Skybolt, just introduced by Sig Mfg. Co., Montezuma, Iowa. Designed by Claude McCullough, the Sig Steen Skybolt spans 5] inches and uses .45 to .61 displace­ ment engines. As expected from Sig, this sharp looking bipe kit features many prefabri­ cated parts, including a full-length formed plastic fuselage top, molded plastic cowling and wheel pants, pre- bent aluminum landing gear, formed wire cabane struts, die-cut balsa ribs with integral alignment jigs, die-cut plywood parts, and printed fuselage sides for building directly on the wood. In addi­ tion to full-size plans, decals, step-by- step instruction booklet with isometric views, the kit also includes an excep­ tionally complete hardware package, with nylon control horns, bellcranks, hinges, tail wheel bracket, nylon wing R/C model of the Steen "Skybolt", by Sig Mfg. Co., for .45 to .61 engines. hold-on screws, push-rod links, alumi­ num motor mounts, and all screws, bolts, and nuts. Price not available as this was written. Many of the same pre-fab features in the Sig Skybolt are also found in Sig’s new scale-like control line Mustang Stunter. Designed by Mike Gretz for sport and precision C/L aerobatics, the semi-scale P-51 spans 50 inches, weighs around 41 ounces, and can be powered with .29 to .40 cu. in. engines. The con­ struction is based on pre-cut foam wing cores, and plastic moldings for fuselage top, lower air scoop, and cowling. Price is $19.95. * * * Something different for radio control is now being offered by MRC, Edison, New Jersey . . . a 1/16 scale Sherman M4 tank! Available in kit form for fast i , V assembly, the tank is ruggedly construc­ ted of metal and plastic, can be com­ Sig's Mustang Stunter, for C/L , .29 to .40 engines. pleted in about 15 hours, including radio installation. Powered by dual electric or without radio for $109.95 list. Any­ selects the 18 inch ribbon(s) for his fre­ motors operating through an assembled one for a back yard war? quency and gives the rest to his wife or clutch and transmission, the tank will * * * daughter for hair ribbons. A dandy way climb obstacles, turn, move forward and Sonic-Tronics Inc., 2 South Sylvania to make points with the family and also reverse. The tread system is fully sprung, Ave., Philadelphia, PA. 19111, phone keep your modeling pals o ff your fre­ with independent wheel suspension, brass (215) 379-2391, has a great new idea quency. The molded fitting clamps over bearings, zinc die-cast sprocket wheels, on frequency flags. These should be of the ball tip and yet allows the unit to combination metal and plastic tracks. particular interest to the hobby dealer, swivel in the breeze. Altogether a clever Chassis is aluminum. A great item for because each package contains all the idea. relating the fascination o f radio control flags required for a given band, i.e., 27, * * * to the youngsters in the family. Avail­ 72, or 6 meters. A complete package Marine Specialties, Saratoga, Califor­ able with MRC radio for $249.95 list, sells for 89 cents. The modeler simply nia, has introduced a new outdrive dou-

MAY 1975 5 PIT-PAK by RG's R/C. Combines fuel bottle, pump, glow plug Double rudder outdrive unit for 40 to 60 class power boats, by power, storage, built-in charger. Marine Specialties. ble rudder unit which has applications The second Peerless/Kyosho item is tail kits are also available. Boat kit price on anything from outrigger hydroplanes quite unusual . . . an amphibious buggy is $69.95. See your dealer or write direct. to flat-bottom monoplanes, but is espe­ R/C kit. Designed by a Honda engineer, * * * cially effective on Deep-Vee boats. For the water/land buggy is 19-3/4 inches A new company, K&W Enterprises, 40 to 60 class boats, the HBR-II offers long, 9-1/2 inches wide, and can be driv­ Box 18895, Philadelphia, Pa. 19119 (see twin rudders with adjustable pivot an­ en from land, into the water, and back ad in this issue), is introducing items o f gles, and a power strut that is adjustable on land again . . . just like the real one. special interest to competition-minded for both depth and angle. The twin rud­ A single pull on the starter turns the en­ modelers. Fiberglass props are offered der blades operate in quiet water, out gine over6 times, there are two mufflers, in a variety of sizes, ranging from a 5-5 of the way of the prop turbulence. The a heat sink, duct-fan type propeller, and for Half-A Proto Speed for $1.50, unit includes mounting plate, mounting it is water tight and self-lubricating. Sug­ through Anderson, K&W, Hemmingway, screws, pivot bracket, two rudders, two gested retail, less radio and .15 to .20 Theobold and Cox Specials for F/F and pivot pins, three control arms, strut, engine, is $195. Send 50 cents to Peerless C/L, to a Rev-up type, 11x7-1/2 R/C water pick-up, and all hardware for com­ for catalog. Tell ’em we sent ya! prop for $4.25. plete installation. Price, $34.95. Single * * * A prop pitch gauge is also available ruddered Variable Outdrive Assembly, Accuscale, 18801 Napa St., North- for $19.95, and an engine brake called for 20 to 40 class boats, sells for $29.95. ridge, California 91324 announces its “ Stop-A-Prop.” The latter comes in 3 * * * 1/32 scale kit for the “Schnellboote,” sizes, for 1/2A (TD) $2.75, A-B (FAI) Peerless Corporation, 3919 “ M” a German torpedo boat from late World $3.25, and B-C $3.75. Weighing less than Street, Philadelphia, Pa. 19124 has intro­ War II. With its aluminum hull and 3 four grams (FAI version), it will not duced two new Peerless/Kyosho items. diesel engines, the Schnellboote could damage engines, and can be used with First, an R/C glider for 2 or 3 channel move along at close to 50 mph, and was 1 /2A squeeze-off timers. radios, which is scaled after the Libelle the most successful! torpedo boat to * * * and spans 106 inches. It is made o f ABS operate during WW II. The model kit Vintage Aero, producers o f model plastic, with an injection molded front features a 43 inch long fiberglass hull, airplane kits and materials which date fuselage half and vacuum formed rear along with fiberglass, wood, and metal back to the pioneer days o f modeling, half. Wings are covered with Filcote plas­ fittings. A 3 by 4 foot plan sheet and an has acquired K&K Products, o f Allen­ tic covering. A motor mount permits informative “ Schnellboote Booklet" town, Pa., manufacturers of "Pin-, powering with an .09. Suggested retail (with model and full scale photos) are Downs," the great little molded gadgets is $99.95. also included. Separate metal casting de­ for holding light balsa parts in place

German torpedo boat, "Schnellboote", to 1/32 size by Accuscale. Electric powered Sherman tank for R/C by MRC.

6 MODEL BUILDER Prop pitch gauge by K&W Enterprises. Pindowns now marketed by Vintag Aero.

Libelle R/C glider by Peerless/Kyosho. Peerless/Kyosho amphibious buggy for R/C and .15 to .20 engines. over plans while gluing. To be marketed and fuel pump . . . and glow plug clip or green plastic, and the list price is by Vintage Aero as "Big ’Uns" and "L it­ with leads. $49.95. tle ’Uns," these building aids are pack­ An indented area on each side o f the * * * aged by the dozen for $1.89, complete 1.33 gallon, molded polyethylene bottle CPM Products, 11054 Leolang Ave., with metal washers. contains brushed aluminum compart­ Sunland, California, 91040, which mar­ * * * ments. One side holds two “ D ” size kets that excellent nitrate dope, Flo- "Uncomplicate with RG’s Pit Pak.” nickle-cadmium batteries complete with Kote, now offers “ Band-Ades.” These This is the slogan that goes with a new transformer charger, an electric revers­ are triple packs o f rubber bands designed item produced by RG’s RC, P.O. Box ible fuel pump, and jacks for a glow for the F/F modeler in particular and all 406, St. Joseph, Michigan 49085. The plug cord. The other side is a storage model builders in general. Each pack is ‘Pit Pak’ is a sort o f field or pit box with space for tools, plugs, props, etc. Not a sub-divided into 3 compartments and in­ a different approach. Instead o f being a kit, the Pit-Pak is complete and ready to cludes two sizes of wing and stab rubber field box that holds a fuel bottle, it’s use (well o f course you have to put fuel bands, and a goodly supply o f DT bands, a fuel bottle that holds a field box . . . in it, dummy!) in a choice o f red, blue, Continued on page 85

"Stop-A-Prop" engine brake for F/F, Band-Ade assorted rubber band package by Frequency flags by Sonic-Tronics. by K&W Enterprises. CPM Products.

MAY 1975 7 1930 FLEET Sport Scale By ROMEY BUKOLT . . . Sport scale version of a very popular biplane from the 1930's era. An easy model to scratch build, and even easier in the k it soon to be released. See the ad elsewhere in this issue.

• I consider myself fortunate to be old sion hi-speed, hi-performance pattern The Fleet, named after a Major Reu­ enough to remember an era before tele­ ship, and recount the nostalgic days of ben Fleet, was an outgrowth o f the Con­ vision, jet planes, and mini-skirts, when the smooth, easy-going graceful airshow solidated Aircraft Company, under the it was commonplace to spend a lazy sequence. direction o f Lawrence D. Bell, who later summer afternoon out at the local air In contrast to the racy Aeromasters, was to gain fame as the founder o f Bell patch a mile or so east of town, watching Pitts Specials, Acro-Sports and Acro- Aircraft. The first model was granted a familiar red biplane performing an Stars, we bring you the “ Barnstormer,” A.T.C. No. 122, in May 1929. Some in­ aerial ballet of loops, Immelmans, Cuban a stand-off scale model o f the vintage stability was found in the earliest mod­ eights, and spins, in one continuous 1930 Fleet Biplane. els, but was corrected with changes in strand o f imaginary yarn tossed freely across the deep blue sky. The plane was a 1930 Fleet Biplane, powered by a five cylinder radial engine, and dressed in bright red fabric which was accented by large white letters and numbers on the wings. It belonged to an old barnstormer who earned his wings during World War I. He flew every chance he could get, and spent his week-ends picking up enough money to pay for his gas and oil by giving the more carefree townfolk a $3.00 birdseye view of the courthouse, river, and water tower. These are among my fondest childhood memories. Now, all you biplane nuts, who cher­ ish similar moments, and even you younger “ Double winger” enthusiasts, whose only exposure to barnstorming comes from the current film , "The Great Waldo Pepper,” have the opportunity to recount those memorable days. The National Sport Pattern Association was formed for you people. Its objective is to duplicate full scale aerobatics in a real­ istic manner with models which are realistic replicas o f biplanes that have been built and flown. The idea is to get away from the slick, crisp, high speed, Romey Bukolt's daughter, Susie, holds the Fleet for a size comparison photo. At two inch scale, unreal pattern maneuvers o f the preci­ the span comes out to 49 inches. Performance is brisk with a 40 engine. 8 MODEL BUILDER fin and rudder area. Several models were fitted with the five cylinder radial Kinner K5 engine. The Model 8 had a wide fuse­ lage to accommodate three people. The model 10 carried a D.H. Gypsy Major engine for overseas use. A Fleet factory was built in Ontario, Canada and a win­ terized version was built there with an enclosed cockpit. The R.C.A.F. version was called the Fleet Fawn, and the civi­ lian version was called the Fleet Finch. In 1930, the famous movies stunt pilot Paul Mantz broke the record for consecutive outside loops by executing 49 in a Fleet, however, the judges dis­ counted three because they claimed he lost heading on them. A number o f Fleet Bipes are still in operation in the hands o f collectors, and can sometimes be seen at Antique Fly-ins Transparent covering may not be too scale-like, but it provides the opportunity of checking the or perhaps at the big E.A.A. fly-in at open type construction used on this model. Tail surfaces are 1/4 inch soft sheet. Oshkosh each summer. and the wing requires no bent sheeting Lay the plastic over the part, trace the The Barnstormer has a number of or rib capstrips. outline, scoring the sheet with a sharp features designed into it to make it an All four cabane struts are identical, Uber Skiver knife, bend on the score easy-to-build, easy-to-fly, nearly fool­ simplifying installation, and wing align­ mark, and the plastic template will snap proof aircraft. I say “ nearly” because I ment. out of the sheet. Trace around the tem­ know of modelers who can begin with Tried and proven biplane design par­ plate on the wood, using a fineline ball­ an ARF airplane kit and end up with a ameters are incorporated, insuring stabil­ point pen such as the yellow-barreled locomotive. I do not claim credit for ity, performance, good stall characteri­ “ Bic” pen. Simple and quick, it saves this design in its entirety. Many o f the stics, and ease o f flight trimming. the plan and provides a reusable tem­ features are tried and proven, such as the PRIOR TO CONSTRUCTION plate for duplication o f pieces, should Ugly Stick wing assembly and the Acro- A t the end o f the text you will find you need to replace damaged parts or Starcabane struts (which came from our a complete list of materials required for want to build another model. T'Winger. wen). construction of the Barnstormer. Some o f the parts are cut from stan­ The fuselage is basically built around While every scratch builder has his dard dimension stick stock and others, a box made up of two fuselage sides, the own pet way o f doing things, I ’ll suggest such as the formers, are dimensioned so F-2 and F-3 formers, and the cockpit the sequence of steps I followed to get that they can be drawn on the wood floor. the model together quickly and easily, using a ruler, triangle, and a compass. The tail surfaces are simple sheet con­ and you can take it for what it’s worth. If you own a bandsaw or a Dremel struction, with no complicated com­ First of all, I like to cut out all or saw you can stack cut a number o f ribs pound curves at the base of the fin. nearly all the parts, so that in effect, I at a time. All four wing panels are basically can then, begin with a “ k it.” A most The model requires twenty 1/8 x 1/4 identical in span and chord, and rib valuable asset to transfering shapes from hard balsa or spruce sticks for wing spacing, and are constructed in the same the drawing to the wood is a large sheet spars and fuselage stringers. What you manner, with minor modifications made of acetate plastic (frosted on at least one use is up to you, but balsa is generally after the basic construction is complete. side) o f .005 to .10 thickness, found cheaper and easier to come by, and with All the ribs are cut from one template, in most stationery or art supplies stores. shear webbing between the main spars

Williams Brothers scale cylinders and pilot add a lot to the realistic appearance of the ship, both on the ground and in the air. Sig Lite-Ply fuselage sides are light in weight, but very strong. Note shadows from side stringers. A kit is about to be released on this model, put out by the author. MAY 1975 9 in the wing, balsa provides all the trim off I/16th inch from the front or the wing saddle as a gauge, mark the strength you need. But, before chopping edge of the right fuselage half. This will position of the front surface o f the F-3 up three turtle deck stringers from one provide the 2° right thrust when the former. stick, note that you can get one stringer firewall is installed. Cut, fit, and cement the three nose and one wing spar from each stick. Also, Using a triangle, draw a line at right area braces from 1/4 x 1/2 stock, and the cutoffs from the remaining wing angles to the top edge of the fuselage align and cement the wing saddle in spars will provide the necessary material side, at the front of the front 1/2 x 5/8 place, allowing an 1/8 inch space for the for the N-Struts. inch cutout. This line defines the posi­ F-2 former. Repeat this procedure on FUSELAGE tion of the rear surface o f the F-2 for­ the opposite fuselage half. Prior to beginning fuselage assembly, mer. Then, using the cockpit floor piece Cut battery plug and throttle push

Marking the former positions directly on the fuselage sides helps to With sides marked, the next step is to add the 1/4 x 1/2 braces, wing assure accuracy. Right fuse side is cut 1/16 short for right thrust. saddles, and the stab platform. Notches are for cabane strut braces. 10 MODEL BUILDER CO CO

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After joining lower wing, the servo floor, aileron linkage, and mount­ Center section of top wing with mounting blocks and 1/8 inch sheet ing dowels are added. Note similarity to Ugly Stik wing construction. added. For extra strength, add webbing between spars at mounts. 12 MODEL BUILDER Slot the previously scored center ribs, to accommodate the 1/8 inch ply center brace. Install the “ N” strut mounts flush with the bottom surface, in the positions shown between ribs No. 8 and 9. Notice that front mount has a 1/8 x 3/8 inch slot and the rear mount, a 1/16 inch drilled hole. Sand the top surface o f the trailing edge to a taper as shown in the wing section views, and finally, after carefully matching both panels together, join the two panels. The top wing has no di­ hedral. Bottom Wing Completion: Taper trailing edges with a sanding block. With a razor saw, remove the aileron portions by cutting through the trailing edge along the outboard side o f rib No. 3 and the inboard side of rib No. 11, then Top wing and fuselage are aligned on tape marks, as described in text, before soldering rear cabane strut brace joint. Careful alignment is the difference between a good flyer and a toad! cut each rib along the back edge o f the rear wing spars. Using one o f the 1/4 inch aileron end pieces as a template, mark and cut away, the front portion of each rib, then install the aileron ends. Face both the front o f the aileron ribs and the rear o f the wing cutout ribs with 3/32 X 3/4 balsa. Position and install the 1/8 x 1/2 ply bellcrank mounts between ribs No. 6 and 7 as shown on the plan and in sec­ tion. Install the aileron horn mount, also between ribs No. 6 and 7, flush with the bottom surface o f the aileron. Add 1/8 inch sq. bracing to each o f the mounts. Sheet in the area along the bottom surface between ribs No. 6 and 7 from the bellcrank mount to the aileron frame. Cut prescored slots between main spars in No. 1 ribs, carefully match up both wings, insert dihedral brace and join wing halves. The proper dihedral is 4 ° per wing panel, which is equivalent to 1-13/16 inch under each No. 11 rib. Bottom wing is aligned with top wing, fuselage, and table top. There's more to trimming an air­ plane than putting fancy stripes on the paint job! Note outer strut mounting slots. Install the wing dowels, inserting the end in the holes in the dihedral brace and notching the leading edge if neces­ sary, so that the dowels are approxi­ mately parallel to the chord line. Before the cement sets, slip the plywood lead­ ing edge mounting plate over the dowels to insure correct alignment. Notch out the center ribs as shown in section, to accommodate the aileron ser­ vo base. Add servo plate and 1/8 inch sq. bracing. N strut mounts are positioned flush with the top surface between ribs No. 8 and 9 this time, with the slotted mount to the rear and the drilled mount for­ ward. CABANE STRUT ASSEMBLY AND Landing gear mounting detail. Note " V " in bottom just aft of wing opening to blend with di­ hedral. Screw retains battery/fuel tank hatch in forward bottom of fuselage. ALIGNMENT Here’s where you take your time and repair shop. Cut four pieces 8 inches paper. Insert, but do not cement, the do a careful job, because the flight per­ long and bend a 1/4 inch I.D. eye in one four struts into the strut mounts. It may formance o f the aircraft is very much af­ end, then make the other two bends per be necessary to clean out the holes with fected by the alignment o f all the flying drawing. a 1 /8 inch drill or small round file. surfaces. Next, from two 6 inch pieces, bend Attach the wire angle braces to the Soft iron welding rod is available the angle braces. Clean all areas to be cabane strut by binding with fine copper through any welding supply store or auto soldered with steel wool or fine sand Continued on page 60

MAY 1975 13 Pete Neilsen's Big John roars overhead, streamers flying. Pete's son, Tom Mahon, now from Carmichael, California, and his 10 year old Chris, does all the piloting. Power is an OS 80. RS radio. Big John. Tom built new wings, and added ailerons to the top.

R/C News, by BILL NORTHROP

• The FCC has announced that as of March 1, 1975, the fee for a Citizen’s Band radio station license has been re­ duced to $4.00 (yes, four dollars!) This reduction is part o f an overall revision o f FCC fees started earlier this year and represents a substantial drop from the previous $20. fee. We now recommend that every R/Cer get his own station license, rather than depend on a club license. By this means, we can let the FCC know how many modelers in the country are using radio control equipment, and it will give us added weight when we file requests for additional, and safer, frequencies on which to legally operate. The 27 band is practically useless for R/C in many areas now, particularly since many o f the new CB transmitters are equipped with variable frequency oscillators instead o f fixed frequency crystals. The selector dials include the five R/C frequencies, illegal for voice transmission, thus tempting the CBers A Dumas "Shelley Foss" tug carrying the banner at the Pacific Science Center, Seattle, Wash. to use our relatively quiet channels. They Good way to get publicity for a coming show. Photo by Dave Katagiri.

The "Pea Pod" continues to be one of the most popular construction "Made in Japan." The photographs were taken and sent to us by projects ever published in MB (April '72). These two examples were Ritsuri Honda, now President of the Japan Model Yachting Society. 14 MODEL BUILDER Two types of Half-A pylon racers coming out of the active Seattle, Bob Mikko's Half-A streamliner. Heat sink on head saves plugs. Pig­ Washington area. This “Batman" by Gene Weaver. Note eyeballs. tail antenna is typical. Note two wheels in fuselage. Allowed by rules. don’t have to be nearby either. Skip CB signals have nailed R/C models from hundreds o f miles away, even a thousand or more. Many hobby dealers are aware of this problem, and if they are in an area that is noted for heavy CB interfer­ ence, will not sell 27 mHz radio systems to their customers. If you are new to R/C, or have just moved to a new area, check with the local R/C fliers before flying, or purchasing new equipment. SAD NEWS In a letter from Pete Waters, our R/C Contest Board member from Livonia, Michigan, he relates that on December 29, 1974, Tom Brett passed away. Tom was World Champion at the R/C Pattern competition, held at RAF Kenley, Great Britain (we believe that was in 1962). His pattern model designs were classics (Nimbus, Perigee, Appogee). He was a member of the Detroit R/C Club, and his pretty wife, Helen, was an active committee member. Tom had been out o f modeling in recent years, having taken up full scale flying. Bob Petro, Athol, Iowa, is building this neat little 30 inch span Sperry Messenger for Astro 05 electric power, and 4 channel radio. He's been having a ball with electric in the cold country I

A whole gaggle of "Pea Pods" at the Pacific Science Center pools. Built in a crafts program for A serene site for model sailing. The Center was young modelers, they are outfitted with vane steering, considerably less expensive than radios. designed by Minoru Yamasaki, for Expo '62. MAY 1975 15 That father and son Mrlik team at it again! Jerry (father) launches Dave Leach launches his Esprit at the GDSHS Sno Fly. Note the for Jeff, Warren Tiahrt on the watch. Jeff went on to win Sno Fly. winter clothing. All Sno Fly pictures by Charles "Bud" Pell.

Jack Malott, Don Lubahn, Jim Hansen, and Tom Kelley, of the Warren Tiahrt does some plowing with his Esprit. His timer is Otto Lansing, Mich. CARDS, on the "assembly line." "Man in the Mask" Heithecker. Brrrrr! MORE BIG JOHNS Two more members of the Big John Owners Club o f America have been heard from. One o f the earliest members, Tom Mahon, o f Carmichael, California, has just recently restored his 10 year old OMT version, adding some wing area. The trusty O.S. 80 fired up the first time after an 8 year layoff. The ship now weighs in excess of 13 pounds, but Jfl i with the added area, still has plenty of bounce. We had a look at it at Taft, California a few weeks ago. f i I X The second B.J. is also an OMT ver­ j ■’’O' am I sion, built by Pete Neilson, Grand Junc­ --- . w F m s x r r W - ■ tion, Colorado, and is powered by an O.S. 80. It was rebuilt in 1970 following a house fire (hard to keep a good model down!) and is now covered in transpar­ ent red Monokote. Son Chris does the flying, with an RS radio. By the way, the original BJ OMT is still alive and well. It is in the hands o f Fred Smith, Levittown, Pennsylvania. Saw him at the WRAMS show in White Plains, N.Y. a few weeks ago, and he is willing to let us have it back ... which Continued on page 70 Some of the Sno Fly winners with hand made plaques. Standing (I to r): Ray Hayes, Jeff Mrlik, Jim Steele, Bob Robinson, and Mike Gaishin. Kneeling (I to r): Chris Corven and Barb Robinson. 16 MODEL BUILDER The very popular Swap Shop (“ My Junk is Your Bargain") was in full swing on the upper level, occupying the floor space over the entrance lobby of the building. To us, the highlight o f this year’s WRAMS show was meeting a double image face to face. The Good brothers have always been to R/C modeling what the Wright brothers were to aviation, but until the Friday night cocktail party hosted by “ Pops” Schroder, we had never met one half o f the team. Bill Good has not attended any kind of modeling function for over 30 years, and when we first saw him at the party, unaware that he was to be present, we thought he was Walt, and that his stay in Germany for two years had altered R/C's answer to the Wright brothers . . . the Good brothers; Walt (left) and Bill. Their famous his appearance just slightly! What a "G uff" was borrowed from the Smithsonian for special ceremony at the WR AMS show. relief to have the confusion end when 1975 WRAMS SHOW

• The Westchester Radio Aero Mod­ display booths on the main floor o f the elers, Inc., (WRAMS), held its Seventh building. The lower level, scene o f the Annual Eastern States R/C Jamboree, entire show just seven years ago, was the in White Plains, New York, on March 1 display area for hundreds o f models and 2. This show, which has rapidly brought in by hobbiests who were com­ expanded into one o f the three largest peting for prizes in more than a dozen affairs o f its kind in the U.S., occupied categories. In a separate room on this all three levels o f the Westchester County level, continuous film shows were being Center, and officials are now faced with offered to the thousands o f spectators the prospect o f finding a larger location who were solidly packed into the build­ for next year. ing throughout all the available hours Just under 90 exhibitors occupied o f each day.

Hank Hankinson (Sr. and Jr.) at the Sonic- Tronics booth pointing to Glo-Devil plugs.

George Hill holds the fiberglass fuselage for the new P-47N Sport Ritchie Brooks and Long Island Hobbycrafts were showing a new Scale model by Airborne Associates. He'll pattern fly it too. Great Lakes for the NSPA pattern competition.

Bill Mazarack's big 1/4 size Sopwith Snipe placed third in World War Guess we were judging the wrong things. Standard kit models won One category. One of 3 huge scale jobs. the Sport Biplane category prizes over this original design. MAY 1975 17 Many unusual glider designs were in evidence. The T.W.O. (The Wierd In second place for gliders, directly behind the T.W.O.,was "Henry One), was a canard creation by Dick Sarpaulis and Andy Pederson. Hawk" by Tom Wood, Bainbridge, N .Y. All foam. brought from the Smithsonian Institu­ tion, the original “Guff” radio control model which Walt and Bill flew back in the late 30’s and at the 1941 Nationals. Through a juggling o f dates, the WRAMS had the first show o f the “ Big Three” this year, and since it came close on the heels o f the “ Big Magazine Ca­ per,” there was a constant undercurrent of conversation among the exhibitors on the subject. In spite o f headquarters literature claiming otherwise, the conver­ sation was almost unanimously in oppo­ sition to the proposed (already decided?) publication. There were quite a few new items on display . . . too many to cover all at once here. We’ll be describing them from time to time. Heath Company’s new radio has plug-in RF sections for both transmitter and receiver, permitting fre­ quency switching across all three com­ monly used R/C bands... about 30 bucks per frequency set. Airborne Asso­ ciates has a classy new Sport Scale “ Jug” (P47) that will fly pattern. Coverite finally has its prepainted, iron on fabric, Classy little Cape Cod Cat Boat, by Fred Jay "Dumas” Brandon fielding one of many Noesner, Union, N. J., was one of our favorites Perma-Gloss. And there are many more questions on the renewed interest in boats. in the boats and ships division. coming. Walt appeared alongside. Thank Heavens One old modeling friend estimated in his own case, modeling provides a they were wearing different suits! that probably 20% o f the adult male relief from everyday worries, and we To complete the Good story, W RAMS spectators at the show were victims of need it now more than ever. Show at­ members requested permission and the recession . . . out o f work . . . but as tendance would seem to bear him out. ·

Another original helicopter by Faye Peoples, again beat out by kit Sorry, we didn't record the name of the builder of this Miss Phila­ models. This one is called the Lone Ranger. . . .Get it? delphia, designed by Maxwell Bassett, and kitted by Scientific.

18 MODEL BUILDER A little too polished for the rigors of Half-A pylon racing? Not really, when you consider the gleaming pieces of work that appear at most Formula I events. Perhaps this will tend to bring up the quality. SEA FURY PYLON RACER By JERRY HOLCOMB .. . Modified Junior Falcon Half-A Pylon Racers are nice, but semi-scale pylon racers are nicer. The Sea Fury is both fancy . . . and fast. • This model was designed to be as light with the Ace foam wing that a lot of rolls with the CG as shown on the plans, weight a racer as could be built within 1/2A designs use. This is not intended but be warned that a more rearward CG the RAMS Half-A racing rules without as a statement for or against the Ace will indeed produce a nice rapid snap ignoring the rules' scale intent. With an wing, it is just that the rules require a when you yank in the “ up” for a hard all up weight (including a 225 ma bat­ minimum 7/8 inch thickness, and awider turn. I discovered this when I installed tery) o f 20 oz, the original design objec­ chord seems to work better. a 500 ma battery in place of the usual tive was met. Design complexity is some­ Simple, squared-off wing tips were 225 ma pack! The model normally stalls what higher than a simple “ box” type used for lightness and simplicity, and straight ahead power-off, but o f course, model, but the much better appearance because I get lazy sometimes. Aerody­ P-factor (or torque, if you wish) will o f the finished model makes the extra namic tip-losses because o f the squared cause a roll off to the left in power-on work seem worth while. (Incidentally, off shape could probably be improved stalls. If you do encounter a snap-roll the original won 2nd Place, 1/2A Pylon, by using some sort o f end plate, but I tendency with the CG as shown, you at the 1974 Seattle RAMS Show.) have no proof of this. I do feel that this have too much control movement. I A fairly low aspect ratio wing plan- wing planform and airfoil handles well used the horn lengths shown on the plan form was chosen to get a more favorable with no unexpected nasties. and the inside holes on my Kraft KP2B thickness/chord ratio than is possible I have not experienced surprise snap- receiver/servo output arms. Wing construction is designed to be as light as possible. I would suggest that you use 1/16 sheeting for the wing if you can find some good light weight wood. I built the original during the last “ balsa shortage” and had some trouble finding good 1/16 sheet, thus the 1/32 sheeting shown on the plans. Even using the 1/32 sheet will prove more than strong enough for any flight loads and most landings, provided you include the 3/4 oz fiberglass cloth in the finishing process. (Note that I said “ landings” and not “ controlled crashes.” I try to build my models to fly, not to be crash­ proof. If you are looking for an over­ built design to compensate for your hard landings, this one isn’t for you.) Tail surfaces are just medium weight 3/32 balsa sheet with a surfacing resin finish. It does get a little tricky instal­ ling Klett hinges (which I recommend) in the edge o f 3/32 stock, but it can be done if you are careful. Seattle RAMS rules for Half-A require a minimum of 200 squares of wing area. This one is Fuselage construction starts with the covered with sheet balsa throughout, yet just meets the required weight. two 1/16 balsa sides, with the doublers FULL SIZE PLANS AVAILABLE - SEE PAGE 88 MODEL BUILDER Rudder and elevator controls are internal. If you build 'em in, make sure they are going to last several seconds longer than the aircraft! Tail surfaces are of 3/32 sheet balsa. Note outlet for heated engine air. Important if you want the mill to keep running. installed between formers as shown on the plans. Next, glue in F5, F6 and F7, making very sure that you get everything aligned and square. Now add the top sheeting between F6 and F7. Add F4 and sheet the top of the nose. Form the conical motor mount from F1, F2, and F3 . . . cut to fit these pieces. Add the fuel tank of your choice. A one ounce tank will work for suction and crankcase pressure, or cut a suitable opening in F2 if you intend to use a bladder type tank. Install this unit o f F4 and then finish sheeting the forward fuselage. This coni­ cal motor mount is quite strong and has proven to be trouble free. Just be certain that it is well glassed in place. Now you can finally bring the fuse­ lage sides together at the tail and sheet the rear fuselage top. Add the horizontal stabilizer/elevator assembly (the original Cowl is made from a plastic bottle. Filler line extends almost to thrust washer for refueling model had an internal horn and pushrod without removing cowl. Note line filter. which must be installed at this p o in t. . . if you decide to use this sort o f arrange­ ment, be certain that it will keep on working for the life o f the model) and then sheet the fuselage bottom. Add the Z / vertical fin, a couple o f small balsa fil­ lets on either side of the fin, fill any small dings with vinyl spackle, and sand the whole machine smooth. Finish the model with surfacing resin and 3/4 oz. fiberglass cloth. Top o ff the finish with an epoxy paint of a suitable shade ... the original was dark blue-grey with white undersides. Markings were cut from Trim Monocote. Oddly enough, you are almost done. You must still figure out where to put your radio gear and how to install the engine. A Kraft “ brick” will fit between F5 and F6, while a 225 ma battery will fit quite nicely between F6 and F7. A Continued on page 85 RAMS rules permits Jerry to use a Kirn-Kraft TeeDee .051, also pen bladder pressure, if desired. Much of the fun of Half-A racing is due to the use of local club rules. MAY 1975 21 A semi-scale Elfe lazily feels its way along a Pacific Coast slope site in northern California. Photo by Whitey Pritchard.

SOARING By LE GRAY The Standard Class Syndrome . . . a lively subject, this . . . and Soaring Editor may have suffered an acute attack of recurring foot-in-mouth disease. And those withdrawal pains are going to be murder. Fortunately, there's plenty of room for said foot in mouth. Who else can thermal on his own conversation?

• Man, it ’s getting hot out there! appropriate solution . . . as he sees it. graph 3 that’s on page 45 o f the 1974- If you have yet to hear some o f the Before things go much further, it 1975 book. proponents o f various Standard Class might be worthwhile to throw out a So where did Standard Class come R/C Sailplane rule concepts . . . you just rather tired cliche: like cool it, man. from? There’ll be those who may argue haven’t heard really torrid oratory. Sorta Some o f the stuff that’s starting to hit the p o in t. . . and they’re wrong . . . but reminiscent of the hell-fire and brim­ the streets. . . or fan, as the case may the first public pronouncement "Hey, stone bit that used to scare the devil be. . . is unfair, unthinking, and at times, let’s divide these gliders up into two clas­ outta me on Sunday mornings as a kid. almost questions the heredity o f the op­ ses like they do in full scale” was made Come to think of it, that must have been position. Let there be some basic ground atop a barbeque table at Hummingbird the idea . . . and it sure did work, though rules o f war among us gentlemen of the Haven, Livermore, California in the we have effected some recovery in the soaring sport. First, let it be assumed summer o f 1968. The occasion was the last 30 years. So what’s that got to do that each person in the melee has the founding fun-fly o f the late National with sailplanes? Not much . . . unless exact same interest in the advancement Radio Control Soaring Society (NRCSS). you want to compare the passion, the and growth of the sport, and especially The speaker was Chief Foundee, Jerry emotion, and the absolute conviction o f Standard Class competition, as every Nelson, and about fifty or seventy-five the speaker/preacher. other person. Second, let it be assumed guys seemed to think that some split Seems as if about everyone who has that everyone knows the identity of their ought to be made. After a bit o f lively even the slightest interest in a standard father. Third: nobody’s sister chased banter, 100 inch span fell out as a rather competition class is up in arms either troop trains. Fourth: no soaring sports­ round and workable number. It definite­ defending what is or attacking what man’s mother wore tennis shoes to her ly separated the Lil-T’s from Nelson’s ain’t. And there aren’t just two sides to Senior Prom. fiberglass Ka-6’s . . . and that was about the matter, but at least four that we’re Now, let’s talk. all that was needed. The 100 inch dimen­ aware of . . . and there may be more. As At this point in time, there are NO of­ sion worked pretty well for those inter­ with most debates, there are good strong ficial, AM A Rules Book-identified classes ested in scale configuration because most points and some weakness in each camp. o f R/C sailplanes. There ain’t no Open were built to 1/6 size which gave a mod­ And . . . each representative o f every . . . there ain’t no Standard . . . just sail­ el o f a Standard sailplane a span o f about position speaks with complete sincerity, planes with size and weight limitations 98 inches. Great. Besides, the important honesty and personal integrity. He feels as set forth by the FAI for international thing was to get back to the fun o f fly ­ very strongly about the subject and the competition. Check Section 39, para­ ing. Wonder whatever happened to that

22 MODEL BUILDER ridiculous idea. Fortunately, we’ve pro­ gressed. Awhile later, and dates aren’t impor­ tant, some of the folks planning con­ tests under the auspices of the old ECSS believed that the big sailplanes could whup the not-so-big sailplanes just dern near ever’time. The old story about a good, big man can most always beat a good, little man. They picked 100 inch span as the dividing point. It may have been coincidence or it may have been a direct tie back to the NRCSS classifica­ tion. Who cares!? The S.O.A.R. sponsored R/C Soaring Nationals provided a division for the un­ official but popular 100 inch Standard Class. This has been a big thing each year since inception, and has done much to promote the national interest in Stan­ dard sailplanes. West Coast activities have followed the pattern and most club and regional meets identify Standard and Open Class competition. The LSF 1974 R/C Soaring Tournament was the first o f its series to recognize other than Open . . . wide open . . . competition. That there is and undoubtedly always will be a Standard Class within R/C soaring competition is an irrefutable fact. Okey, so what do we have to work with, where do or can we go from here . . . and why? As mentioned, there is no AMA class breakdown within the general category o f R/C sailplanes. There is a proposal on Even after the wind has calmed down, it's kinda nice just standing here and listening to the waves breaking on the shore. Photo by Whitey Pritchard. the AMA docket to define a “ Basic Sail­ plane Class” limited to a maximum some o f these ideas. Look at some of the high-performance wingspan of 100 inches and two con­ The Basic or Standard Sailplane Class Nordic free-flight glider wings. The span trols, specifically rudder and elevator or proposal and the several cross-proposals may be only six or seven feet, but con­ V-tail ruddervator configurations. The that have been presented to AMA all peg struction can be a practical exercise in proposal prohibits any other functions out a sub-classification from the AMA toothpick-bridge building. On the other or features such as ailerons, flaps, spoil­ Section 39.3 requirements. This leaves hand, few wing configurations are sim­ ers... and most pointedly . . . does not a rather large void: no definition of pler or quicker to build than that of the allow thermal sensing devices. The idea what’s left. That is, there is still no 12-foot Yankee Gull. (MODEL BUILD­ behind the proposal is to provide a sim­ proposal that identifies an Open Class ER, March/April 1972) ple, economical machine suitable for the ... either by title or specifications. The Transportability? A two-piece, 12- "average” flyer, but at the same time so-called Open Class will still be unoffi­ foot wing can be loaded into a VW. Try provide for “ a competition class o f sail­ cial and merely that which is not Stan­ Continued on page 58 plane that represents a more reasonable dard Class. Or is Open an absolutely investment o f time, effort, and monies anything goes, unlimited category which than do the very large complicated sail­ means a Standard Class vehicle could be planes presently used by the top compe­ registered and flown in Open Class? titors.” This two-control concept might Don’t knock it. There are numerous em­ be identified as the “classic” definition barrassing incidents at major contests for Standard sailplanes, and represents where Standard Class sailplanes have out­ the basic point o f departure in this pointed the Open Class behemoths and ------^ friendly, nationwide discussion. won top honors Overall! Haven’t those A second or “ cross” proposal submit­ guys heard the “ good big man/good little ted to the AMA R/C Contest Board man” bit? Perhaps the classes should be agrees with the 100-inch wingspan lim ­ called Standard and Bigger. itation ... but as the only restriction. But how about that 100 inch span This concept would permit any number limitation? It may be the perfect dimen­ of controls or functions. If you can lift sion. Listen to some o f the arguments. it with 100 inches, you can fly it. There’s talk about simplicity of construc­ It seems that most of the current tion, about transportability, and about noise is generated around this variance: the economics attributable to this one two-controls vs. unlimited functions. perfect length of wing. Wonder what an However, another cross-proposal speci­ inch or two, one way or the other, would fies a wing area limitation in addition to do? the maximum span. Now that ought to There is no direct relationship be­ really get things stirred up. tween wing span and complexity . . . as­ “Come on fellas, there's plenty of room up Let’s back up now and look into suming reasonable limits, o f course. here for all of us!" Pritchard photo. MAY 1975 23 Jerry "Sea Fury" Holcomb flying one of his original design single rotor choppers. Photo by Mark Freeman. CHATTE By JOHN TUCKER

• As promised, I’ll lift-off this month area and would like to meet up with Flies’’ he wrote for Model Airplane News with the Graupner Bell 212 Twin Jet those interested in scratch building. He a few years ago. He has a number of construction review, but first, let’s clean offers a complete shop equipped with ideas he’d like to develop and would like the mail box and list the new chopper a Unimat and Atlas 6 inch metal lathe, to team-up with a serious partner or two. pilots who need help, or will share their plus numerous other facilities. He also He can be reached at A pt #1, 155 Den- knowledge with others: indicates he has a complete collection rose Drive, Tonawanda, N.Y. 14150, Western New Yorkers, give Ed Grey of anything that has ever been published telephone 716-691-5924 evenings. a call if you need your interests sparked on model helicopters, and has an indexed Here are some others, for the record: a bit! Ed writes that he has been trying anthology! You might remember Ed George Jablinski Jr., 21 Ferndale Ct., to create an interest in helicopters in his from the article “How a Helicopter Battle Creek, Mich. 49015, wants advice

New rotor head and swash-out for the Kavan Jerry Holcomb flies his experimental tandem twin rotor helicopter. It is not perfected yet, but Jet Ranger. See text for more information. test flights show steady improvement. Photo by Bob Yorkston. MODEL BUILDER Graupner 212 fuselage with ply formers installed. Installation of cabin top reinforcement plates.

Bottom view shows tank mount (cut-out for gear) and clip for Bottom view from other side, also showing landing gear formers. rubber band strap. on how to start building, etc. experience, wants help on extended off. Jerry L. Holcomb, 1010 N.E. 122 flight. There were lots more, but since space Avenue, Seattle, Washington 98168, Thomas F. Diamond Sr., 1129 Alien- is limited and we have a long way to go, phone (206) 892-7732. Has built 8 chop­ grove St., Philadelphia, Pa. 19124, Kavan I’ll save them for next time. Now, for pers in past 2 years, including scratch- Jet Ranger, needs help in wiring gyro to the Graupner 212 kit review ... built tandem rotor designs! Will share tail rotor servo. GRAUPNER BELL 212 TWIN JET his special talents in design and set-up. Carl W. Hickman, 3434 E. Valencia HELICOPTER Robert J. Fogg, 20 Orchard Lane, Ave., Lot #32, Tucson, Arizona 85732, Thanks to the very precise instruc­ Springfield, Vermont 05156, phone phone (602) 327-3966. Graupner Bell tions and clear illustrations, a detailed (802) 8854382. Kavan Jet Ranger. Will 212, has training platform but needs report on how to construct this gem will share basic set-up and hovering flight help on trim and moral support for lift- not be necessary, even for the tyro build­ er. There are a few areas, however, that might be elaborated on, and that's what I intend to do in this report. Last month we talked about reading and re-reading the instruction booklets, so now you should have a good idea of how to begin. Starting construction with the airframe kit, I found the engine mounting box was the first thing to tack­ le. Not surprisingly, the wood formers were die-cut to professional standards, and tit very well; only light trimming was necessary to get an excellent fit in the fuselage. Remember, the mechanical drive assembly is not mounted on the centerline o f the fuselage, therefore the formers are not symmetrical and could throw you o ff if care is not taken! Each former is plainly marked as to which side is right “ R” and how it faces. The “ Endfest” cement is good for attaching the box to the epoxy fuselage, since it has a long-cure time at room temperature (several hours). This allows time to posi­ Radio servo box (looking toward front) and Another bottom view of formers in engine bellcrank rod assembly. compartment. tion formers and move them around to MAY 1975 25 Drive shaft and control tubes for tail rotor. Initial gearbox and drive shaft installation, looking toward tail boom.

John is threading the tail rotor drive shaft into the coupling, with Fitting the main rotor shaft. Can that be a Tauri in the background? the aid of a pair of tweezers. get the best fit. There is a disadvantage After installation, you can’t get to these since the adhesive on the back side o f though, in that the Endfest tends to run surfaces and they will become oil soaked the paper picks up every little speck of down like syrup and forms puddles in in time! airborne lint, which w ill definitely show the lower parts o f the assembly. Careful While the fuselage assembly was cur­ through the thin paper covering when use o f a monokote heat gun will set-off ing, I sanded and sealed the rotor blades finished. The blades balanced perfectly the curing process much faster, but be per instructions. My personal preference when done; Graupner makes a point of careful you don’t get it too hot or it will is to resin finish and spray appropriate matching the blades from identical thin out like water and run even faster! K&B Superpoxy color, rather than cover wood. The metal straps for balancing Be sure to finish all surfaces o f the for­ with paper. In this case, however, I did the tail rotor blades are very handy and mers and reinforcement plates with follow the instructions and used the do a fine job ... they could be used for sealer or resin (except for gluing edges) covering material supplied with the kit. other blades as well. prior to cementing into the fuselage. Be sure and work on a dean bench, Back to the fuselage now, and making

Engine assembly installed. Starting belt rests in landing gear bracket Plastic parts with wood veneer cemented in place. See text, when not in use. 26 MODEL BUILDER Trainer modification upper bearing imbedded in epoxy. All servos installed. Radio receiver on right side, battery on left.

Adjusting pitch arms. Final installation of tail rotor gear box. Yup, sure is a Tauri! the lower formers which support the than those generally in use in the United work in the final hook-up! A new Part landing gear. UHU-Coll cement was used States. Parts 133, 135 and 136 were dis­ 136 was made, slightly larger, to provide to laminate the formers and Endfest for carded, and only Parts 134, 137 and 138 better support for bracket 138. The in­ gluing in position to the fuselage. The were used to make a basic frame which structions were very inadequate for the only problems I had in this area were in would accommodate my Orbit servos. installation of the bellcrank shaft assem­ locating Part 127 on the plans or instruc­ Hardwood servo rails were glued between bly. The description in the instructions tions, and the instruction to cement for­ the two 137 formers so the servo output did not match the plans, parts were num­ mer 115 in place did not appear to be in arms are positioned at exactly the same bered incorrectly, and some parts were logical order. A little common sense and height as indicated on the plans. Inci­ missing or different materials substi­ checking parts dimensions cleared up the dentally, the plans show all servos in tuted. This is not a big deal since any problem and the rest of the assembly the neutral position and if you make R/C modeler can jury-rig his own bell- went along O.K. the linkages and rods according to the crank assembly, however, it was a dis­ Some modifications were made to the exact measurements and position the appointment in view o f the excellent servo box as the original drawing was servo output arms in the illustrated posi­ detail work on the rest o f the kit. Cau- for the mounting of different type servos tions, you will save endless hours of Continued on page 80

Clamping gear skid straps prior to to drilling for mounting bolts. It’s beginning to look like a helicopter! Preliminary assembly of landing gear. MAY 1975 27

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EXPERIMENTAL « « SO. F4 T 4 4 LBS. 66 0 LBS IS 0« IS »O L M ./ F T 1 SPECIFICATIONS Full copiessize of this plan are available direct from Harold Osborne, Box 2033, Fullerton, California 92633.

ro oo MODEL BUILDER CASSUTT MODEL 2

By HAROLD OSBORNE

• This is the earliest design by Tom Cassutt. It was raced by Cassutt in 1959 and I960, and was then sold to Capt. Jan Christie, o f Scandinavian Airlines. Unfortunately, the aircraft was later destroyed in a hangar fire. The aircraft in the drawing was the basis for further Cassutt designs. The later Model II had more vertical tail area, and an 11% airfoil replaced the previous 6% “ razor blade.” Plans were made available so that homebuilders could produce fast, safe, flyable private airplanes w ithout spend­ ing years in design. ·

MAY 1975 29 A 17 ounce package of fun and relaxation; Ace Radio Control Dick's Dream with Ace Pulse Commander and Astro Flight 02 electric motor. PRODUCTS IN USE

Astro Flight's Astro 020 electric motor, plus Ace Radio Control Dick's Dream and Pulse Commander radio. By KEN WOLF

• As one of the old timers who has were standing in mist hovering between monumental test flight represented a been fascinated with electric R/C flying, a sprinkle and a rain. However, we were hundred cumulative years o f gas model I drop in periodically at the Astro Flight determined to test the "D ick’s Dream” flying. offices located near my own plant. On a and sought the shelter o f a large tree to As you can imagine, there were a recent visit, while talking to the Bou­ protect ourselves while we were rigging number o f suggestions and opinions as cher’s about my Astro 25 powered Bush- the airplane and charging the battery. to how the first flight should be con­ master, I noticed a very small motor on The four participants attending this ducted, and also whether the airplane the desk. I was told this was the proto­ type of their new 020. I asked if I might flight test it. They accepted and sug­ gested that I try the motor in a proven single channel kit. I chose the "D ick’s Dream,” by Ace Radio Control. We then called Paul Runge at Ace and told him what we had in mind. Within a week we had the "D ick’s Dream" kit and a Pulse Commander radio unit. The choice of the "D ick’s Dream” proved to be excellent. About a week later I called the Boucher’s to tell them that the model was ready and that they should meet me in the vacant lot near my plant for the test flight. Since there had been much specula­ tion about the performance o f this com­ bination, I had also invited another one of my old timer flying friends, Dean Kenney, whose experience goes back to Bonner Specialties, pioneers in radio control flying. t When we all gathered at the field, we Electric everywhere! Two large cells in front (left) power the Astro 02 motor. Ace actuator is were rather dismayed to find that we next, with foam wrapped receiver under. Receiver batteries servo taped next to rear bulkhead. 30 MODEL BUILDER Motor installation. It is cemented into hole in Air scoop for cooling motor batteries. With proper cooling, batteries will last for thousands of firewall. Air inlet and oulet holes important. flights. Air must also get out. Vent through wing over hatch handles this. would carry the water load which was After about a five minute flight, we evaluate the performance characteristics sure to accumulate the moment we got were aligned for landing and discovered in acrobatic maneuvers. out to launch. The two electric experts that we were coming in quite fast, which We found that the model rolled to were chosen for the initial test flight, we attributed to the balance condition. the left best, but this, o f course, we at­ with Roland Boucher on the stick and However, there was no damage as the tributed to torque with no elevator con­ Bob Boucher launching. The motor was weeds in the field provided a nice land­ trol. This time we got about an extra turned on and the plane launched. The ing cushion. minuteof flying time due to the altitude model headed for a group of tall trees After a few moments o f discussion we had acquired in the initial climb-out, about 200 feet away. Roland compen­ . . . you can imagine, with a hundred where the maximum thrust occurs. sated with a left turn and immediately years of expert opinion . . . it was de­ The landing this time was routine discovered that we had a nose heavy cided that we needed a little incidence and uneventful. The following week we condition, because on turning, he lost in the wing. There was also some discus­ decided to take the model to the Oxnard altitude. After a hairy pass between two sion about the propeller being used, so Air Force Base, where we fly with the trees, he then went into a right turn to we changed from the Top Flite 5x3 to Camarillo Flying Circus. Sonny Myers, see if we had any better condition coun­ a Cox grey plastic 5x3. This time the a well known Quarter Midget racer and teracting the torque. This turned out to drizzle had stopped and we were ready scale builder, who built the prototype be a saving maneuver, and on the return for some serious evaluation, whereupon o f Jack Stafford’s B-24 Liberator, was leg o f the first circle, the model con­ the author took the control box and the Continued on page 84 tinued to gain altitude and we enjoyed second launch was executed. We knew about a three minute power run during we had the trim right this time. It took which some maneuvers were attempted only a minute to get about 800 feet alti­ to get used to the Pulse Commander's tude. After a couple of circles in either reactions. direction, Bob Boucher took the stick to

Here is a gaggle of free flight electric powered models by Tony Naccarato. Most are Astro 02 The smiling author with the test set-up. A per or 05 powered. Awkward at first, electric power is becoming more and more refined. feet combination for the young at heart. MAY 1975 31 PRODUCTS IN USE Bridi Hobby Enterprises "D irty Birdy." By CHARLES LARKEY

This very neat installation shows the Rhom retract air switch and the servo installation. Receiver and airborne batteries are wrapped in foam. Wide wing fillet gives odd shape to fiberglass fuselage in this view. Air lines lead to retracts in wing. 32 MODEL BUILDER Underside of wing, showing main gear in partial retracted position. Note foam pad to absorb Fully retracted main gear in wing well. fast action of pressure retract system. Finish is K & B Superpoxy.

• The “ D irty Birdy” is the new pattern planes. These techniques have been pub­ airplane for 1975 from Bridi Hobby En­ lished a number o f times, so I w on't go terprises, Fiberglass Division. Designed into them. For the modeler who has by )oe Bridi primarily for FAI compe­ never built a fiberglass airplane before, tition, the Dirty Birdy is causing a lot o f a complete set of instructions are in­ excitement in all pattern circles. At the cluded. first pattern contest of 1975, the South­ My Dirty Birdy was built and finished western R/C Championships in Phoenix, in about three weeks. I used 3/4 oz. Arizona, pre-production Dirty Birdys fiberglass cloth and resin to seal all balsa placed 2nd in D expert, 1st and 3rd in parts, then two coats of K&B Primer B, and 2nd in A pattern. followed by K&B Superpoxy Paint. The kit contains an epoxy glass fuse­ Power was supplied by a Supertigre G60 lage; foam wing with 3/32 inch balsa ABC. The radio I use is the S. and O. sheeting; foam stabilizer with 1/16 inch Mk II. Retracts are by Rhom. balsa sheeting; machined balsa and hard­ The Dirty Birdy is a pattern ship, wood; hardware pack (including motor that in the hands o f a good flyer, will mount); plans; and written instructions. be hard to beat. There is still time to All the parts are o f excellent quality. build before the summer contests, so Construction of the Dirty Birdy is get going. · similar to most fiberglass pattern air­

Top view of wing center section, shows aileron servo and air line connections to retracts.

Supertigre G60 ABC engine with venturi muffler and pressure take- Charles Larkey’s Dirty Birdy in a moment of glory. It was mid-aired off. Venturi mufflers have stupidly been ruled out by F A I. a short time later . . .snif! MAY 1975 33 “GREMLIN” Half-A Stunt

By TOM DIXON . .. Build an economy size control line stunt model that need not make excuses to anyone. It w ill do the complete schedule in a clean manner. . . and at much less cost in materials and fuel.

• Last year, L.M. Cox sponsored an event for their ME-109 Super Stunter at the Nats. I had such a blast that I decided to see what could be done to make a Half-A “ really” fly stunt. When Dick Mathis published the "Pinto,” I built one and found it had potential, but suffered in the way as its big brother, the “ Oriental.” It was too fast, and wobbled some in the squares, due to the straight wing. The Gremlin represents another step forward in Half-A stunt. It uses a thick tapered wing, long moments, and a Cox "stunt special” engine. The result is a small airplane which can be competitive in most local level contests. Further work could still be done, possibly, and I’m not stopping with this model. I think one could go even larger, such as 40 inch span, if you run a double-port engine. WING Construction is very conventional, being merely scaled down “ big airplane” style. A few notes concerning some de­ tails are in order however. Use light wood everywhere, except the leading and trailing edge sheeting. Medium weight, long grain wood is used here to avoid sagging under the covering. At first glance, both in this photo an the one above, the Gremlin has all the looks of a "full" I would strongly recommend adjustable size C/L stunter. It will do the complete schedule, and is competitive in most local level contests. 34 MODEL BUILDER MAY 1975 FULL SIZE PLANS AVAILABLE - SEE PAGE 88 35 Profile of the Gremlin again has that "air" of being a big stunt ship. One thing that’s not big. is the cost of building it! tip weight, and maybe adjustable lead- point shown on the plans. This is critical. stunt engine. I run regular 5% Nitro Sig outs. I had to cut the covering on the Any further aft and you will have a stunt fuel. More nitro only makes the original twice before I got the tip weight handful. I use a Cox plastic handle to engine hard to set. right. which I’ve added .018 cable and a set You will find the Gremlin capable of Controls should be set up "slower” screw for adjustment. Use the middle doing everything a competition stunter than for a large stunter. That is, requiring set of holes in the handle to avoid over should do. It squares, especially well. more handle movement for the same control. With the engine I use, 42 ft. Experiment with line spacing at the amount of control movement. Half-A .008 lines are about right. handle, C.G. position, line length, and models are much more sensitive than The “ stunt special” engine is a TEE props until you get the plane trimmed large models in this regard. Bushings are DEE .049 with Kirn-Kraft needle valve, to suit you. I hope you enjoy it. If you not necessary. single port Babe-Bee cylinder, and low have any comments or questions feel Sheet top and bottom of half the compression glow head. On a 6-4 Cox free to write me at 9025 Hurst Court, wing at a time to avoid warps as the prop, this set-up gives plenty of power Jonesboro, Ga. 30236, or c/o MODEL glue dries. Be sure to round o ff the and even sort of four cycles like a “ real” BUILDER. · leading edge adequately. TAIL Ultra-light wood is mandatory here. If necessary, cut out center of stabilizer and elevator and use 1/32 ribs. FUSELAGE Note that the fuselage is very narrow. It will be necessary to notch out the motor mounts to fit the engine crank­ case between them. The tank is made up from a 3/4 oz. Perfect tank with half o f another one soldered to the end. This gives runs o f seven to eight minutes. Vents are conventional type. Top and bottom blocks should be hollowed aft of the C.G. in order to eliminate as much tail weight as possible. Also, do not elim­ inate the Nobler style cut-outs in the fuselage sides. Cover all surfaces with “ 00” silkspan or Japanese tissue. Use only a minimum (3 coats or so) o f clear to tighten and seal the covering. Follow this with 1 fil­ ler coat and wet sand with 400 paper. Spray a light coat o f silver overall to block ink marks and fillets. Spray a minimum amount of color and trim and seal with one coat of sprayed clear. This should give a finished weight of about 12 ounces, and require only a small Votive heard.of Old. Tim er1 "free amount of ballast in the nose. fight haven’t you? Well, this is TRIM AND FLYING Start with the model balanced at the an example of 'Old Timer’ stant."

36 MODEL BUILDER Did someone say,"Let's have an R/C sailing regatta."? A whole flock of Marblehead boats gathered for a regatta at Sasayama. Japan. The photo was sent to us by Ritsuri Honda, President of the Japan Model Yachting Society.

smewBy ROD CARR an

• To complete our YANKEE, we next previous fitting list. First, a three-eye mounted deck hardware as shown in shroud and stay plate was used instead Figure 1. In the interest o f lightness, of the jib rack on the centerline forward. two departures were made from our Measurements are given to the center

Sheeting system in a Marblehead class boat as Two Marbleheads at work in Sasayama Regatta, Japan, sold by Kobe R/C Center, in Japan. MAY 1975 37 Figure 1

loop o f the stay plate. Secondly, a proper the winch arm). Drop vertically down­ This will prevent it from snagging other sized hole was drilled into the foot of ward at that point to the horizontal boat’s rigging when maneuvering in the mast and a 6-32 bolt with the head axis and read o ff the amount of jib or “ close quarters.” You can also easily removed was epoxied in the hole with main boom radius that you need change the close-hauled position o f the about 3/16 inch protruding. After it (10-1/2"). From the point where the sails by adjusting the cleated end w ith­ cured, the threads were filed off, and main boom swivels (the gooseneck) mea­ out opening the boat to get to the bow­ the diameter of the stub measured. Then sure out the MBR (main boom radius) sers we put on the other end o f the a 4 inch long brass plate was drilled to distance and put a small screw eye under sheets. You can also put another screw accept the stub as well as two flat head the boom to receive the main sheet. In a eye into the main boom, about 4 inches screws for mounting to the deck. (See like manner, measure from the jib swivel out from the gooseneck, for the vang to Figure 2). Also, an aluminum chunk out JBR distance and put a screw eye pass through. A second cleat will go on was shaped as in the figure to serve as under the club to receive the jib sheet. the underside o f the boom for securing the lower anchor for the main boom Directly under these positions on the the vang. A discussion o f the role of the vang. centerline of the deck is the preferred vang in mainsail control w ill be found Mounting o f the sheet exit guides location for the sheet exit guides. You in the Sept/Oct. 1974 issue o f MODEL poses some special problems. For a com­ can simply measure from the points in­ BUILDER. plete discussion o f the winch/winch arm/ dicated on Figure 1 to locate your sheet Figure 4 shows the basic dimensions sheet exit guide/boom attachment tech­ exit guides. for the mast and rigging. The permissible nique, intrepid AMYA President Bob Remember, you need to know how location of the jib stay attachment point Harris has available a monograph. Write many degrees your sail control unit arm on the mast is given in the AM YA rules to him at 7628 Dunston St., Springfield, swivels, and you need to know the length as 80% o f the height o f the main head- Va. 22151. A stamped, self-addressed o f the radius o f the arms o f the SCU. board bottom. On the prototype, we envelope is suggested. Here, we will ab­ Then, enter the graph to find out where ended up with the main headboard 63.5 stract from his treatment to specifically the boom attachment-points are for the inches above the deck . . . 80% o f that cover our current installation. We have sheets, as well as where to put the sheet is 50.8 inches, but we dropped to 49.5 set up the Little Hercules winch in the exit guides. inches just to insure that a measurer prototype YANKEE to rotate 120° be­ Attachment o f the sheets to the would be easily satisfied. We used the tween the close-hauled and running-free booms is easily accomplished by cleating jenny rack arrangement to support the positions. We also know that we wish the free end to a cleat after it has passed jib head, however, remember that noth­ both jib club and main boom to rotate through the eye we previously fixed to ing which holds up the jib can extend about 85° between close-hauled and each boom. Put the cleat about halfway beyond that 80% location. One wag has running-free. Additionally, we can mea­ down toward the gooseneck or swivel, suggested that the test of legality in such sure the arm length which will fit easily and put it on the underside o f the boom. a case is to cut the offending cable or inside the YANKEE, and discover that the radius o f the winch arm which we can work with is about 4-1 /8 inches. Now, using the graphic calculator in Figure 3, we can enter the vertical axi* with 4-1/8 (the length of the double purchase winch arm). Proceed horizon­ tally to the right until we intercept the line labeled 120° (the angular swing of

38 MODEL BUILDER strut, and if the jib falls down the piece some o f the gathered technical data about top speeds, nor any of the other cut was illegal!! The jenny stays pass about the hull would be o f interest to myriad factors which affect total boat through arms of the jenny rack, but the budding naval architects among us. performance, it does give us a good idea they are free to slide in the struts, and Prismatic Coefficient, Cp = 0.52 o f acceleration potential. It is accelera­ are not contributing to holding up the Wetted Surface: tion which will separate boats in a tack­ jib. The jenny rack was described more As built stock, 574 sq. in. ing duel, or in close work around buoys. completely in the December 1974 Bulb 4 lb., 5 in. fin, 479 sq. in. It also will rank boats in the order in MODEL BUILDER. 3 lb. lead in 5 in. fin only, which we would expect them to begin The mast cross sections shown on 442 sq. in. planing. Figure 4 seem to be a good compromise Center of E ffort o f Sail plan: This plot does not tell us any more between strength and lightness. In our On main luff, 22 inches above the than that a Warrior II has about 36 case, the mast was originally slotted, deck. square inches of sail pushing each pound, but the slot was filled in with a pine Lead: while a Yankee has about 57 or so sliver and some epoxy, then the mast Sail plan Center o f Effort is 2.5 square inches pushing each o f its pounds. was turned around and a line of round- inches forward o f Center o f Lat­ Tis food for thought. head wood screws put in. A wire was eral Resistance of hull underbody. Our long awaited launching was com­ tensioned in the lined up slots o f the Center o f Lateral Resistance: pletely uneventful. I’m happy to say that screws and soldered in place, becoming 27-3/16 inches aft o f bow. the boat floated right on her design a “ jackline.” Our mainsail lu ff was Center o f Buoyancy: waterline and needed no shifting o f bal­ treated to a series of dress hooks placed 27.37 inches aft o f bow, which last to obtain fore and aft trim. Winds on alternate sides and now swivels nicely undergoes an aftward movement were gusty, in the 10-15 knot range, and on its jackline when reaching. o f about 5/8 inch when heeled we did see the first stages o f planing Trim ballasting for sailing should be 20°. developing on the reaches, but were done with the winch batteries. Don’t Wetted surface change with heel: more concerned with windward perfor­ put any more weight aboard her than Only about 40 sq. in. decrease mance. The entire boat stayed dry as a necessary in order that the acceleration with a 20 angle o f heel. This is bone, showing the benefits o f preplan­ o f the boat remain at its potentially high contrary to one’s guess when look­ ning the installation by utilizing ideas level. ing at the hull. seen on previous vessels. April 27th will We’ll have continuing comments Finally, I plotted the displacement o f see her in the first out-of-town regatta, about our YANKEE this season as we popular 50/800 class models against the so we should have some relative com­ shake her down into competition trim. sail area/displacement ratio (Fig. 5). ments on performance after that time. All trim and tuning discoveries will be This ratio is telling us how many square Jim Gale, o f J. G. Products, was nice passed right along to you. inches o f sail area are pushing each enough to send us the latest version o f We spent a morning with the lines pound of boat weight. Sort of a power his radial jib fitting. We can’t resist swap- from the YANKEE and thought that factor. While this plot tells us nothing Continued on page 75

MAY 1975 39 Bristol F-2B fighter, scale 1"=1'-0"( span 39-1/4", built by David Carroll, Raleigh, North Carolina. It's powered by a Cox .020 Pee Wee reed valve engine, and flies beautifully; power left - glide right. Scaled from Wylam drawings. Photo taken by John Paul Jones.

FREE FLIGHT SCALE By FERNANDO RAMOS

• The fuselage structure on most scale are many beautiful plans, such as the the Messerschmitt had really appealed kits on the present day market use what Cloudbuster’s Racewings as well as “ Fly­ to me, and I wanted to build them both. is commonly called the half-shell meth­ ing Scale Models o f WWII,” published But there I was, staring at my most un­ od. This method for building fuselages by MB. favorite type of construction, and won­ has been around for a long, long time, Itseemsas though every time I would dering whether it would be worth it or and is particularly suited for airplanes start a rpodel with half-shells, the fuse­ not. that have round or elliptical cross-sec­ lage would only get partially finished. I decided to build the 109, but there tions. However, in the many years that No matter how hard I would try to keep had to be a way to handle the half-shells. I have been modeling, I can count on the bulkheads straight, there would be a I designed a jig that has eliminated all of one hand the number o f fuselages I have couple that wouldn’t cooperate. String­ the problems I have ever had with this built using this half-shell method. This ers would never fit straight in the pre-cut type of construction. This holding jig is ought to tell you what I think about notches, and on and on. Well, after so simple, I wonder why I didn't think this type of construction! I personally going through MB’s plan book, I wanted of it sooner. Look at the photo showing feel that there are more pitfalls with this to build nearly all o f the models within the jig. It is nothing more than a way to system, and they can be very discourag­ its cover, particularly a couple o f Doug support each bulkhead in its proper loca­ ing, especially for beginners. Yet, there McHard’s creations. The Hurricane and tion straight and true. The object then

DH-6 by Don Srull, built from enlarged (to 20") Mooney Peanut Bill Hunton’s Boeing B-9, built from the old Cleveland plans. Seen at plans. Won biplane class at Andrews AF Base contest. Preston photo. combined Metro Area Scale Soc. and D.C. Maxecuters contest. 40 MODEL BUILDER Bulkheads are sliced loose from jig, and fuselage removed. Lower stringers are added and fill-in sheeting inserted, ready to sand. is to build the upper half o f the fuse­ that the vertical pieces o f the jig will all square. This whole operation took only lage, then when this is completed, the be the same height. The actual height about twenty minutes to do. fuselage is removed from the fixture and then is simply a little more than the Before going on to how the bulk­ the lower half is completed. Believe me, deepest bulkhead from the side keel heads are attached, and so on, let me this really works and the end results will notch to the bottom o f the fuselage. On cover some areas that can help with the be most gratifying. the Messerschmitt, I wasn’t as fortunate. making o f the bulkheads, keels etc. Too Let's see how this is accomplished. I The side keel was not straight, so I had often on a plan, the keel templates will used pine and planed it down to 1/4 to make each vertical jig piece a different not match the one shown on the fuse­ inch in thickness. I realize that not every­ height. To do this, I simply drew a pencil lage drawing. Therefore I would suggest one has access to a planer, but 1/4 inch line about 1/8 inch below the bottom o f using the fuselage profile and top view plywood or even hard balsa, would do the fuselage and parallel to the thrust for making the keels. If the keels are just as well. The width of the jig is deter­ line. Then I measured each bulkhead nothing more than curved graceful lines, mined by the widest fuselage bulkhead. station from this line to the bottom laminate a couple o f 1/16 inch square Cut enough material for both the base edge of the side keel notch. I marked the sticks over the respective drawings. An­ and each vertical piece to this width. base for bulkhead location, and lines other problem that is often encountered The height of each vertical member is were drawn at right angles to the center is that the templates for the left and determined one o f two ways. Usually, line. The vertical members were then right bulkhead halves do not match when the side keel is perfectly straight from glued to the base, making certain they placed together. The way I handle this the nose to the tail post, which means were aligned on center and perfectly Continued from page 87

Don Srull launches his winning 24" Siemens Close-up of highly detailed Bristol Fighter built by David Carroll, Raleigh, North Carolina. Schuckert E-1 at Andrews AFB contest. Photo by John Paul Jones.

MAY 1975 41 .... variety is the spice of flig h t. . LINDBERGH IN RETROSPECT don’t want the litter from a sandwich to the South Pacific Theater, and this book • Many eulogies have been written since symbolize my first contact with France.” is highly recommended to those who the passing o f Charles A. Lindbergh, and Lindbergh’s first book, “WE,” was care to pursue his history further. certainly there is not much that can be copyrighted in 1927, and written in From a model builder’s point o f view, added to the praise which has been be­ haste shortly after his epic flight. His Lindbergh is almost unique, having vir­ stowed upon this most deserving indivi­ “The Spirit of St. Louis,” copyrighted tually single-handedly been responsible dual. Yet, the man remains much mis­ in 1953, was his “ revised" version of for generating more interest in full size understood. Within the past few months, “ We." It is doubtful if any other avia­ and model aviation than any other mor­ we have had the opportunity to review tion related publication ever had more tal. A spin-off from his famous flight was a number o f books devoted to Lindbergh thought and research expended in pre­ a virtual flood o f newspaper and maga­ and his deeds. These included some of paration. Much of it was written during zine articles, plus books, dealing with his own writings, those o f his wife, as World War II, while Lindbergh was oper­ aviation in general and Lindbergh in par- well as works by other authors. It is ating from various island outposts in Continued on page 79 important in undertaking such a study, to be aware that Lindbergh disagreed strongly with the majority o f articles and books written about him by others, including those which glorified his deeds. He was subject to harassment by the press, probably to a greater degree than any other person, and yet, the power of the printed word was responsible, in a large measure, for his fame. Lindbergh was a man of many facets. He was an ecologist long before it be­ came “ fashionable,” and he had a parti­ cular aversion to land exploitation, and so-called “ sport” hunting o f animals. A measure o f his consideration and thoughtfulness can be appreciated from noting that he even refrained from tos­ sing a sandwich wrapper out of the “ Spirit of St. Louis” when nearing the Parnell Pixie to one inch scale, by Bill Byshyn, Brooklyn, N .Y. Span is 17-1/2", length 18". end of his first transatlantic flight. "I It weighs 1.3 ounces.

A collection of autogyros in France, both free flight and R/C. Photo Brown CO2 powered Aeronca C3 by Daniel Walton. Ship is built to by M.G.Chaulet. Rotorcraft in France are called marguerites (daisies). 3 /4 " scale and features realistic structure. 42 MODEL BUILDER

In lew than ten year» Fox Glow Plugs have be­ S.The third feature originated by Fox, and as far an idle bar plugs are used in throttle motors, as these come the World'» largest selling glow plugs; primar­ we know still exclusive with Fox, is the use of a have a better capability of keeping the element ily, we like to think, because we offer advanced patented space-age insulating material. This mat­ warm during prolonged idle periods. The 2-volt design and quality products at moderate prices. erial will withstand a higher temperature than series are similar to the 1.2-volt series except that Some of the features that have made Fox Glow Plugs glass but is not brittle and will not crack under the element is slightly smaller in diameter and more successful than others are as follows: stresses introduced by tightening the plug. longer in length and provides th»· resistance neces­ 1. Gold plated core pieces: This has a double advan­ 4. A fourth feature that has made Fox Plugs popular sary for use in lead acid batteries. A lot of peoplr use tage of providing a superior weld between the is our method of manufacturing the idle bar hous­ a motorcyde-type battery and tap off one cell to electrode and the core piece and in addition, ing where the idle bar is an integrally machined provide current for the glow plug. The racing series makes the beat possible contact with the glow (dug portion of the housing. This virtually eliminates plugs are not for general use and are intended only lead. You will have virtually no contact problems the risk of a weld failure and having a piece of the for u b c in engines which have very dose squish with Fox Glow Plugs. plug drop into and destroy the engine. bands and seem to be unable to hold an clement in a 2. Tlie second feature, discovered and originated by 5. A fifth reason why Fox Glow Plugs have been standard plug. Our racing scries plugs have ele­ Fox, although now used by some of our com­ successful is that most engines seem to run better ments made of a different material which is much petitors, is the use of a Rhodium-platinum ele­ with them. The way they got that way is that we stronger at operating temperatures and can resist ment material, rather than the iridium-platinum have made thousands of plugs with varying di­ the shock waves which a dose squish band will set generally used in yesteryears. The Rhodium- mensions and selected the ones that seemed to off. This, unfortunately, makes it unsuited for use platinum combination has the advantage of ignit­ work best on a wide variety of engines. with a standard hobby battery or Nl-Cad. Some sort ing the fuel at a substantially lower element temp­ Hie standard series of plugs are our best sellers. of a rheostat controlled power source must be pro­ erature than the iridium-platinum alloy. This These arc usually used with a hobby battery or in vided that will limit the input amperage between 5 means that when you do a touch-and-go or a simi­ some cases a Nl-Cad. The short standard and long and 6 amps. The benefit, however, is a virtual end to lar maneuver your engine in lean likely to quit standard are generally used in control fine motors element failure. when you hit the throttle. where idling is unimportant and the short and long

FOX FOUR WAY WRENCH FOX TWO WAY WRENCH The Fox Two Way Wrench was originally developed in our The Fox Four Way Wrench is a professional grade tool own shops for the convenience of our own employees in specifically designed for those who like the four way design working with Fox Engine*. The small end of each of these but are not satisfied with the low grade die cast tools now on wrenches are all broached to fit the Fox Glow Plug and are the market. The Fox Four Way Wrench is the finest you can necked down so that they will reach inside of the fins. The buy. The beautiful chrome finish of the Fox Four Way length of the T-bar is enough greater than certain die cast X Wrench doesn’t work one bit better than if it were a dull. wrenches that it often makes the difference between the . battle-ahip gray, but it docs a world of good for your morale propeller staying on or being thrown off in flight. Use a Fox t / i \ ant^ pride and isn’t “pleasure" what modeling is all about? Wrench and you will not be throwing propellers. Fox 2 Way Wrench - Fite 3/16 shaft motors 70101 Fox 4 Way Wrench...... 70104 Fits Vi shaft motors . .70102 Fits 5/16 shaft motors 70103 q FOX 15BB FOX 40 BB

B ore...... 590 Bore...... 800 Stroke...... 550 Stroke...... 790 Disp . .15(.25cc) Disp...... 399 Wt...... 6 oz. W t ...... 11 oz. RPM ...... 26000 R P M ...... with With big-throat \ . # racing carbu- carburetion and a ~>! retor and prop racing prop with 60% nitro fuel 28,000 RPM with pattern O*... V carb and 10-6 The new Fox 15BB is an all new motor unlike any that you have seen prop - 13,500 before. It uses the basic Schnuerle porting concept. However, the motor has been put together in an altogether new fashion, which makes it possible to The Fox 40 BB offers many interesting possibilities. With a conventional shape and contour the bypasses the way the motor wants them. Also, the small throat carburetor it makes an excellent pattern engine for the medium structure is rnorr rigid and warp free than most conventional design 15 size radio control pattern type airplanes. For high speed work the same engines. The flanged type carburetor mount makes possible a wide choice of carburetor used on our Fox 78 will bolt right on and will provide enough flow carburetion. The Fox 15BB has probably the largest main bearing and for the engine to run quite smoothly in the 20.000 plus RPM range. The big crankshaft port of anv 15 size engine available in the world. The main .590 diameter crankshaft can be ground out on the inside to over 7/l6th diameter is .‘150 and on the OD and racing enthusiasts can safely grind the ID diameter, which is a bigger hole than you can get on any 40 size rear intake. out to 3/8ths diameter. Unlike conventional ball bearing motors, the new Fox The cylinder porting follows the most modem Schnuerle type thin ting and 15 runs loose balls directly on the crankshaft in the highly loaded rear the round exhaust stack provides excellent attachment possibilities for a position and runs an 5ΛΕ 660 cost bronze bushing in the front position. This carry away tube, standard corfccpt muffler, or a tuned pipe. A variety of loose ball arrangement completely bypasses the retainer failure problem. cylinder options are available. It is normally supplied with a single ring Another unique feature of the Fox 15BB in the unusual curvature in the two aluminum pistun and a nitrided cylinder. However, soft steel or brass cylin­ primary by-paoaes. This curvature directs the by-pass gas over the lop of the ders liners can be ordered. Also ABC type alum pistons can be ordered. With piston and against the bar k wall directly and then as the piston lowers, all of these options at your disposal you have a wider choice than is available sweeps upward, resulting in better piston cooling and a more complete from any other manufacturer. The Fox 40 BB was intended to be a competi­ cylinder All than conventional straight bypass arrangements. It is rare that a tion engine but it has none of the crankiness often associated with competi­ motor will perform outstandingly in a medium RPM range; and with no tion engines. For average sport flying you will be amazed how it will run and change in port timing can be fitted with a small propeller and a big carburetor run and run and give you no problems at all. and will perform equally well in the racing range. The Fox 15BB is truly an Fox 40 BB with suction type needle valve assem ...... 14100 exceDtional motor with pressure type needle valve assem...... 14200 FOX 15BB with Suction N. V. Ansern...... 11600 with pattern type carburetor ...... 24100 with Needle Valve for Pressure...... 11700 with racing type carburetor ...... 24200 with Throttle for Sport Flying...... 21600 with Throttle for Racing ...... 21700

FOX EAGLE 60 FOX COMBAT SPECIAL

Bore...... 800 Stroke ...... 715 Disp ...... 359 Wt ...... 7% oz. RPM ...... 19,000 with an 8-7 combat type prop

The Fox Eagle 60. first introduced in 1972, has now undergone several minor redesigns and has evolved into one of the World’s most practical sport grade 60’s. While it lacks a few hundred RFM of being the equal of our new Schnuerle ported Fox Hawk, it is undoubtedly one of the easiest starting motors on the market. It always starts, hot or cold, and no starter is neces­ The Fox Combat Special is a specialized type of motor designed especially sary even for beginners. A simple straight-forward construction makes for Combat flying. Its needle valve assembly is designed to hold the pressure repairs easy to make if you should be so unfortunate as to have ti vertical of bladders and to give reasonable adjustment with a pacifier or bladder landing. The Fox Eagle has the remarkable capability of running an fast and tank. Construction of the engine itself follows normal double bearing prac­ reliably after 100 or 150 hour use as it does when it is brand new. Basically the tice except that the nose is very short to minimize turning radius inertia. The loop scavenge arrangement on our Eagle is a more economical design to piston is lapped mrehanitc and the piston and cylinder thickness have been produce than the Schnuerle port arrangement of our new Hawk and we think so matched that the cooling rate on both are nearly identical, which is what that fora great percentage of sport flyers a few r.p.m. is of less significance you need for superior hot restarts. In keeping with best construction prac­ than the dollars involved. Construction-wise the latest Eagle features a tice, the crankshaft main is a full half inch diameter and made of alloy steel. muffler mount that can be removed by means of two screws from the bypass The connecting rod has been machined from bar and is bushed on the lower side without removing the engine from the airplane. Like all larger Fox end. The cylinder arrangement follows a proven Schnuerle porting arrange­ Throttle Motors, the throttle can be operated from eitheT side and above or ment. Considerable experimenting has been done with the porting to achieve below the barrel. The cover over the front bearing protects it from dirt and a setup that will give an almost flat power curve over a fairly wide range of grime. The con rod is now bushed on the lower end. The Fox Eagl*? has two mixture. What this means, of course, is that if your bladder fails to maintain conventional type rings with the result that cranking compression is proba­ constant pressure your engine still doesn't sag on you in a match. The bly better than any other 60 on the market. The Fox Eagle 60 is also lighter Combat Special is also suited for free-flight models and nit race type models. weight than most 60s and can often be used in airplanes planned for 46s It should be clearly understood that the Combat Special is not a motor for without any balance problems. Furthermore, remember that when you fly beginners and it was not intended to function on a conventional suction type with an American made Fox Eagle you have parts and service as near as your fuel system. telephone. FOX 36BB Combat wSpedal...... 1370013700 Fox Eagle Θ0ΒΒ with Suction type needle valve assem. 16099 with standard pattern type carb...... 26099 ψ FOX 45BB FOX MOTORS Bore ...... 850 Stroke ... .790 D is p ...... 45 with W t...... 12 oz. RPM .. .14,000 BALL with 10-6 prop BEARING

The Fox 45BB is brand new for 1975 and introduces a whole new bag of tricks for the enthusiast to explore. The exhaust stack is round and will MAIN accept a 5/8 diameter soft alum tubing extension so the exhaust can be routed at your convenience. The crankcase rear cover is extended upward to form a generous size rear by-pass and make possible a matching front BEARINGS by-pass. Note these are substantially wider than on most Schnuerle motors. All walls on the crankcase casting are 3/32 thick. The crankshaft is mounted ; on the same two ball bearings our Eagle and Hawk are and has a more generous gas passage than any shaft rotor 60 we have seen. The flanged carburetor mount, besides providing a more warp free than usual way of mounting the carb, also makes possible a better intake intersection design than possible with a drilled hole. The con rod is machined from alum bar and is bushed on the lower end. The cylinder has been carbonitrided and is virtually wear proof. The piston is cast aluminum and is fitted with a single Hi-tension ring that has been specially processed for a perfect cylinder fit. FOX HAWK 60 The Fox 45BB will fly a plane about as fast as most loop scavenged 60’s. It weighs less, is smoother running, bums less fuel, and costs less. The use of a 10” prop helps ground clearance problems. The Fox 45BB runs very nicely on FAI Fuel, yet will utilize nitro fuels to full advantage. We think our Fox 45 Bore ...... 907 is the highest state of the art offered today. FOX 45BB · Suction Needle valve assem ...... 14600 Stroke...... 937 Needle valve aeeem. for pressure...... 14700 Disp ...... 604 Throttle for pattern flying...... 24600 W t ...... 15 oz. Throttle for racing...... 24700 RPM ...... 13,500 with pattern car­ buretor and nar­ row blade 11-7 prop FOX 78 RPM ...... 23,000 with large throat carburetor and 9-7 Bore...... 1.00 racing type prop Stroke ..1.00 D is p ...... 78 Wt. ....19 oz. RPM . .13,500 with an 11-8 prop 10,000 with a The new Fox Hawk 60 is undoubtedly America’s finest pattern 60. In 15-4 prop matters of power, fuel draw, smoothness and life, the new Fox Hawk 60 is equal or superior to the glamorous imports selling for $ 150.00 or more. Every part has been made carefully and attention has been given to make it look attractive as well as function well. For instance, the cylinder head is made from bar stock and anodized an attractive red. The cylinder section is made with integral steel fins, which make the cylinder liner so stiff that there is very little likelihood the cylinder liner can warp out of round in compression areas. The cylinder liner itself has been nitrited and is file hard. The piston is made from a very special ultra-hard low expansion aluminum which is manufactured under patent protection. Each piston has more than twice the strength of ordinary aluminum pistons and has an expansion rate compara­ ble to that of iron, which makes it possible to fit the piston itself much closer with no seizing problem should the motor go over lean. If the motor does go The Fox 78 suited out as a 74, ten years ago. Over a period of years the over lean about all that happens is that you lose power and perhaps burn out a stroke was increased to make it a 78. The by-pass was deepened. The 3 glow plug. The connecting rod is machined from bar and is bushed on both by-pass ports became 4. The piston was re-designed several limesas was the ends with bearing bronze material. The wrist pin is retained with large crankshaft. The old 2 plug head was abandoned in view of today's reliable aircraft style snap plugs. Another important feature of the Fox Hawk 60 is its glow plugs. A great deal was learned about fits. remarkable capability to pul out as much power on alcohol fuel as most Today’s Fox 78 has more torque and power over a wider RPM range than ordinary engines do on nitro mixes. You will find that the Fox Hawk 60 will any comparable motor. It is light enough to fit in most airplanes calling for put out a good solid lVfc horsepower on a FA I type fuel. If you do a lot of flying, 60’s - yet has the extra steam to Qy hi-drag, power consuming scale models. the extra few dollars of a Fox Hawk 60 costs can quickly be repaid by the fuel Independent tester Peter Chinn rated the Fox 78 as top choice in its field. cost savings in burning a lower priced fuel. Of course, if you do want to burn Fox 78 with suction type needle valve assent...... 17800 more expensive fuels such as Missile Mist, then you really do have a world with RC type carburetor ...... 27800 beater. Fox Hawk 60 BB with needle valve aeeem for suction .16100 with carburetor for pattern flying .. 26199 with oversize carburetor for racing . 26198 FOX MOTORS with CAST

FOX 15 FOX 19

...... 590 ...... 650 Stroke...... 540 Stroke...... 600 Disp ... .15 (2.5 cc) D isp...... 19 W t...... 4 oz W t ...... 5Mtoz RPM ...... 12,000 RPM ...... 15,000 with an 8-4 Prop with an 8-4 prop

This outstanding little motor has been manufactured now over ten years This is the third year of production for this new series Fox 19. During these with only minor modifications. Its success has been so great that a whole three years of production it has been rated by independent testers as the family of 15 sized profile model kits have been produced around it. The main most powerful of all bushing 19’s and equalled only by a couple of double ball bearing is a full %ths inch in diameter and the engine is ported generously bearing 19’s whose price is more than twice that of the Fox. However, throughout. The piston is machined from meehanite bar and the cylinder is remarkable power output is only one of the things that make it such a from leaded steel. The newest series features an improved needle valve desirable motor. All the functioning parts are generously proportioned and assembly which can be readily replaced in the event one of your landings is with normal use you can expect well over 100 hours life. Under crash less gentle than you had planned. The main bearing is cast SAE 660 bronze conditions it survives remarkably well. In the event you really give it a rough which wears longer and has less friction than powdered metal bearings. landing you will find it the easiest motor to disassemble and repair you have Fox 15 with Suction Type Needle Valve Aseem...... 11500 ever worked on. The carburetor flange mount is distortion free. The cylinder liner is thick and sturdy. The crankshaft main is a full 7/16th inch in diameter. The motor starts very easily. The weight is light enough so that it will fit readily in most airplanes designed for 15’s and give you the extra power necessary to get it off grass or drag an overweight airplane around. Fox 19 with Suction Type Needle Valve Aseem...... 11900 Standard type R. C. Throttle ...... 21900

FOX 35 STUNT FOX 36

Bore ...... 800 Bore...... 800 Stroke ... .700 Stroke .715 D is p ...... 352 Disp .. .359 W t...... 6% oz W t.. .7% oz. RPM ....9500 RPM 11.000 with 10-6 prop with a 10-6 prop

The Fox 36 powerhead is a direct descendent of the Fox Blackhead Combat Special introduced in 1957. Through the years minor modifications The Fox 35 Stunt is probably the most successful model airplane motor of have been made to each part as experience dictated. Today’s 36 features a all times. First introduced in the winter of 1948, it was skyrocketed into the full half inch diameter main bearing, meehanite piston, leaded steel cylinder limelight by winning first in the 1949 Stunt Nationals. In virtually unchanged and of course a Fox one piece crankcase design. The normal carburetion form it has continued to win more control line stunt contests than all other model is ideally suited for sport flying in beginner type airplanes of the makes combined. In the year 1974 the Fox 35 Stunt powered the World’s Ringmaster, Flight Streak, Magician category, as well as the built up types. Championship winning control line stunt model and powered the firet place For high performance applications, such as combat or free flight where a Open and Junior winners at the Nationals and also powered the Walker bladder or pressurized tank is planned, the open throat model is indicated. Flyoff trophy winner. These fantastic successes are not the result of any This is the same motor except the intake has been chopped and bored and super promotional schemes or luck. This particular motor has running the needle assembly has been replaced with our combat type needle assemb­ characteristics that make it uniquely adapted to control line stunt. The RPM lies. With the RC version you have a choice of two carburetors — a smaller change with airplane attitude in such a way as to anticipate what the model carburetor is the one that should be used for normal sport type and pattern needs. The Fox 35 Stunt also makes a very excellent beginners engine type flying. The larger type carburetor 19 useful only where the tank place­ because its low compression ratio makes for easy cranking. For 1975 the ment is very carefully controlled and the engine is intended to be used in crankcase die has been completely rebuilt so that the castings are clean and racing type events. With these applications the propeller should be selected accurately made and in addition two small lugs have been provided for an so that the engine will turn right at 15,000 RPM on the ground. With á larger improved type muffler attachment. This muffler attachment is so arranged propeller the carburetor does not function properly. that the muffler can be installed or removed within a minute’s time. The Fox Fox 36 With Suction Type Needle Valve Aseem...... 13600 35 Stunt is offered in only one configuration and one carburetion arrange­ Fox 36 Large Intake with Combat type needle for ment. That is the same one that has won over 16,000 contests. pressure tank or bladder tank...... 13800 Fox 35 Stunt Motor with standard needle valve aseem 13500 Fox 36 With pattern Type Throttle...... 23600 Fox 36 With optional oversize throttle...... 23800 BRONZE MAIN BEARINGS

FOX 25 FOX 29

B o re ...... 680 B o re ...... 738 Stroke ... .680 Stroke .. .700 Disp ...... 25 D isp ...... 29 W t ...... 6 oz Wt ....7% oz. RPM ...12,000 RPM.. 12000 with 9-4 Prop with a 9-6 prop

The Fox 25’s power output is far greater than you would expect from an The Fox 29 has been in production since 1956, when it was first introduced engine of its size. It will easily fly most airplanes designed for 35 size engines as a racing engine. It was quite successful in dominating B speed and B proto and yet give you the lighter weight and fuel economy of the smaller displace­ for several years. As years have gone on we have shaped the Fox 29 into a ment. On the other hand if you are visualizing a 15 size airplane going sport type product which is more docile to handle and we have worked some like a bomb, the Fox 25 fits right into this thinking, as its weight is identical of the temperament out that is characteristic of racing motors. In the Fox 29 with average 15’s. The difference in power is remarkable The Fox 25’s the throttle version has a longer crankshaft than the control line version to construction is conventional but quite highly refined. The main bearing is a provide the clearance the throttle needs. Therefore, on the Fox 29 there is full 7/16ths of an inch in diameter and is generously ported. The piston is more involved than just changing the throttle to get a throttle or non-throttle machined from cast meehanite bar and the cylinder is from leaded steel. The motor. The mechanics in the motors, however, are identical — the cylinder, connecting rods are machined from bar. Under normal use you can reasona­ the piston, the rod, wrist pin. head, crank throw, mounting lugs and power bly expect the Fox 25 to give you over 100 hours running time. The flange head dimensions. type carburetor mount has proven to have less distortion than the types held Fox 29 with suction type needle valve assem...... 12900 in with set screws or clamps, and it makes it an easy switch from one type with large intake and combat type throttle to another. needle valve assem...... 13000 Fox 25 with suction type needle valve assembly...... 12500 with pattern type RC throttle...... 22900 with pattern type RC carburetor...... 22500

FOX 40 FOX 45

B o re ...... 800 Bore 850 Stroke---- 790 Stroke ... .790 D is p ...... 399 D is p ...... 45 W t ...... 11 oz W t...... 11 oz. RPM ...13,000 RPM ...14,000 with 10-6 prop with 10-6 Prop

The Fox 40 Bushing Motor is brand new for 1975 and is chock full of interesting innovations. The cylinder porting follows the new Schnuerle layout. The crankshaft is a very generous 9/16ths diameter. The crank case The Fox 45 is a brand new engine for 1975. It is built in the same one piece is a very rigid one piece casting containing the cast bronze main bearing. The triple bypass type casting as our new Fox 40 and it utilizes the same lower end rear cover has been enlarged in a manner that makes it possible to make the parts. The additional displacement is gained by a larger bore. Its power three bypass cores to the dimensions dictated by best engine design, not by output is about equal to the old loop scavenged 60’s of three or four years ago. the manufacturing limitations. This arrangement has been patented and is The advantages, of course, are that the 45 size engine weighs lees, bums less not found on any other brand motors. The castings themselves are very thick fuel, has less vibration, is less sensitive to weather variations or fuel mixes. and sturdy and will withstand a surpirising amount of abuse. Performance- One rather unique feature of the Fox 45 RC is its round exhaust stack. This wise you can confidently say that your Fox 40 will easily outrun any other was designed with the thought in mind that a soft aluminum exhaust exten- bushings 40’s on the market today and most of the ball bearing 40’s — all of tion could be readily fitted into it and could be bent around in a manner most this with no sacrifice of easy starting or docile performance. The piston is convenient for the airplane builder. The simple, sturdy, patented construc­ made from meehanite metal and has been ground, honed and lapped to the tion makes repair a simple matterifyou happen to have a misfortune. A great leaded steel cylinder. The flange carburetor mount provides a quick and deal of thought has been given to the design of the Fox 45 from a maintenance easy method of varying the carburetion fora variety of specific applications. point of view. For instance, a moderately rough landing that might bend the When fitted with a normal RC type carburetor this engine is ideal for the crankshaft of some engines would only bend the prop stud on the Fox 45 and medium size pattern type RC airplanes. For control line uee intake stacks are this could be unscrewed and replaced at a nominal charge. The patented Fox available in standard diameter, which would ordinarily be used on a control Crankcase is quite heavy walled and is highly resistant to crashes. The line sport model or a wide open throat model which could be fitted with a pen cylinder liner and piston both are of substantial proportions and moderate bladder type tank for the highest possible RPM. cost and can be replaced should the need arise. The Fox 45 Crankshaft has a Fox 40 with suction type needle valve assem...... 14000 very generous 9/16ths diameter main bearing which virtually eliminates the pressure type needle valve assem...... 13900 probability of a crankshaft failure or a bearing wearing out. pattern type carburetor...... 24000 Fox 45 with suction type needle valve assem...... 14500 racing type carburetor...... 23900 with pattern type carburetor...... 24500 FOX PRESSURE FOX REGULATOR TAPS The general advantage of a fuel pressure regulator is that you can adjust your high-speed jet for maximum power for takeoff without the problem of the engine going over lean later in the flight or in a prolonged climbing-type maneuver. This results in more available power and better fuel mileage. Diaphragm pressure regulators have been around many years and have Model airplane motors are assembled by means of screws in threaded been used for a variety of purposes. The Fox Fuel Pressure Regulator is an holes and the nature of our hobby is such that from time to time the threaded adaptation of these well known principles to model size. hole gets burred over, jammed, cross threaded or otherwise damaged. A tap The pressure regulator should be mounted as close to the carburetor as is the tool used to thread or re-thread a hole. Taps fall in two general possible. A recommended installation on a standard RC Ship would be along categories— hardware grade, where the threads are cut: and precision, the side of the engine and no further back than one inch from the carburetor where the threads are ground. Hardware grades are unacceptable for model center. For the pressure regulator to work, a special tank producing from V i airplane use. A precision ground tap usually will cost several times as much PSI to 2 PSI is required. Crankcase pressure will not do this reliably and as a hardware grade but you get a good thread from it. Through a special neither will muffler pressure. We recommend some sort of a balloon or arrangement with Greenfield, one of the world’s largest producers of preci­ bladder-type tank which has rubber bands or springs around it. Later we sion ground taps, we are offering a selection of sizes and types used in model plan to offer special tanks for this purpose. The Fox Regulator is assembled airplane motors. A lubricant should be used when tapping a hole — and it with screws and can be disassembled for cleaning or inspection or replacing just happens that model airplane fuel is as good a tap lubricant as you can the diaphragm. Also it has an external pressure tickle so that you can push a get. button for a second or two and prime your motor. We predict that once you discover how completely reliable your engine performs on regulated pres­ sure you will never go back to the old way. Tip Size Where Used Order No. Fox Fuel Preeeure Regulator .90505

#2-64 Fox 15-19-25 needle 71264 #2-56 Fox 40-45-60-78 Low speed needle 71256 Cart) Plug Screws — FOX PRESSURE Idle Stud Screws FITTING #3-48 Stunt 35 needle 71348 Head and rear cover screws for 15-19-25 ' The Fox Pressure fitting is machined from 3/16ths inch hex brassbar. It is #4-48 Old 36X Needle valve 71448 probably the smallest and most compact pressure fitting on the market. We High Speed Needle offer it with either 4-40 thread« or 6-32 threads. Pressure fittingsare nor- Fox 29-36 RC Cart) maily used to pressurize the fuel tank. For pattern type RC modelspressure Fox 15-19-25 RC low speed needle is usually taken from the muffler housing. For Rat Race type models pres- #4-40 Fox 29-35-36-40-45 head and rear cover screws 71440 Muffler Core Screws sure is usually taken from the crankcase. #6-40 H. S. Needles for all RC motors 29 and larger 71640 4-40 Thread Pressure Fitting...... !»501 L. S. needle 29 and 36 RC 8-32 Thread Pressure Fitting...... i»502 #6-32 Fox Eagle 60, Hawk 60 71632 78 RC Head and rear cover screws

#8-32 Needle Body Nut For all suction N. V. bodies 71832 FOX CARBURETOR #10-32 Fox 15-19 Prop Shaft 71332 ADAPTERS # V»-32 Glow Plug THDS. carb barrel nuts 71432 #y<-28 Prop Shaft Fox 25-29 35-36-40-45 71428 We believe that Fox Carburetors are as good as you can buy. They are #5/16-24 Eagle-Hawk and 78 prop shaft 71524 more linear, simpler and more trouble-free than most. Nevertheless there are a host of other good carburetors on the market which you may prefer because of their color, shape, throttle response or because you just happen to have .one. The Fox Carburetor adapters is a simple casting made with a Tip Holder Um Order No. flange that will mount on a Fox Motor and has a vertical hole and two set screws to take the round-type carburetor. Due to the wide variety of car­ buretors available and the varying number of sizes of stems, we have elected Starred #162 C #2-64 #2-56 #3-48 #4-48 72101 to offer an adapter which can be drilled or reamed out to whatever size you #4-40 #6-40 #6-32 desire. Our A-base pattern fits our Fox 15. Our B-base pattern fits the Fox 19 and 25. The D-base pattern fits our Fox 40.45. Eagle and Hawk 60’s and 78’s. Starred #162 D #8-32 #10-32 72103 Each adapter is supplied with two set screws threaded 6-40. Greenfield #333 #V«-32 #y*-28 #5/16-24 72105 Fox Flanged Carburetor Adapter A size ...... 90601 B s iz e ...... 90602 D s iz e ...... 90604

wN FOX FUEL1 FOX PROP FILTERS REAMERS We believe the Fox Fuel Filter is the finest that you can buy forseveral reasons: 1. Our filter element is an ultrafine stainless steel screen. The factthat the element is stainless steel makes it immune to the corrosive attacksi of fuel itself. Many fuel filters use a brass screen or bronze powdered metal filter 1 Quite often the propeller that you want to use will have a hole smaller than element that soon corrodes and restrains the flow of the fuel. the shaft size on the motor you want to use it with. The Fox Reamers are 2. Our housing is a threaded two-piece assembly with a nylon gasket that designed to provide an easy, and accurate method of enlarging the hole to the can be taken apart for cleaning repeatedly. Many fuel filters cannot be next standard size shaft size without danger of splitting the propeller or disassembled at all and some filters that arc assembled by pressing two getting the hole out of center. We offer two reamers - a standard reamer halves together will become loose and leak after awhile. which would be used for 95% of applications and a KB Special, which makes 3. Fox Fuel Filters have large diameter nipple fittings that are designed to I a step from Vi inch to % in the peculiar manner that that particular engine hold tightly onto the relatively large diameter surgical tubing or isilicone requires. All Fox Reamers are of standard four-flute design and are fitted tubing that is popularly used today. Since no carburetor will function satis- with a T-bar. They can be carried right in your tool box ami used on the field. factorily with fuel dust, dirt, or grass particles or solidified oil, werecom- These are a must for the tool box of every serious modeler. The standard mend using a filter on the line from your tank to your carburetor, andanother model has progressive steps of from 3/16 to Vi to 5/16 and finally 4fc. The KB filter in your filler line. The price is so modest everyone can readily afford the model has a quarter inch pilot and cuts to %. best. Fox 4 Step Ream er...... 70201 Fox Fuel Filter · email...... S0701 Fox KB R eam er...... 70202 Fox Fuel Filter - large...... 90702 FOX MOTOR MOUNTS MACHINED FROM BAR

MEDIUM SERIES LARGE SERIES Width Fits Part No Width Fits Part No. 1.217 Fox .29 new 50401 1.475 Fox 50601 Fox .36 new Eagle 60 Fox .35 all OS 60 OS .30 St 51 1.281 Fox .36X all 50402 St 56 Fox .36 BB al St 60 St .35 stunt Enya 60 1.320 K&B35 50403 Merco 60 K&B 40 1.525 Fox 50602 OS 35 Hawk 60 OS 40 Veco 60 McCoy 40 Webra 61 1.385 Fox 40 50404 Η. P. 61 S T35 rc 1.640 Fox 74 50603 S T 40 rc Fox 78 Wetxa 40 ST G-60 The Fox Motor Mounts arc lighter, stronger, and more rigid than cast mounts or ones made from fiberglass filled plastic. Since vibration is directly related to the rigidity of the motor mount, a Fox Mount is more desirable. SMALL SERIES In the event that you make a crash landing, if a motor is supported by a good sturdy Fox Width Fits Part No. Mount the crankcase is often saved; whereas a weaker mount that will give away first on one 1.000 Fox .15 50201 mount and then the other, twists the crankcase. An advantage of the Fox Mount over wood O S.15 mounts is the ease in which thrust changes can be made. If the mount is attached to a fire wall 1.135 Fox 2 5 50203 with blind nuts in back all you have to do is to loosen the four screws from the front and insert ST .19 a shim under the top or sides. In this way very precise thrust adjustments can be made. ST .23 OS .19 1.217 Speaal for 50204 Fox 35 Stunt

FOX SPINNERS — THE WORLD’S FINEST

CONVENTIONAL SUM JIM

CONVENTIONAL SUM JIM CONICAL STANDA R0 Most modelers agree Fox Spinners arc the world's finest. They are machined from DIA solid aluminum bar with the wall thickness varying from the back plate to the nose CONTOUR NO. CONTOUR CONTOUR SHAFT SIZE piece according to the strength requirements. Since they arc machined from bar they run true and have no balance problems. They were designed primarily with the IV t 60106 60206 60306 10-32 thought in mind that more and more people are using electric starters, and most low 1Vi 60107 60207 60307 10-32 cost spinners w ill not stand up to the beating they get from a starter. 2 60108 60208 60308 V4-28 For 1975 we have added a new contour which is similar to our conventional contour 2V, 60109 60209 60309 V i-28 except that it is more conical shaped and it fairs into wider fuselages better. All Fox 2% 60110 60210 60310 V i-28 Spinners, after they have been machined, are sanded and buffed to a high lustre. The conventional contour and slim-jim contour will both accept the same back plate but the conical contour requires its own back plate. The Fox method of retaining the spinner completely eliminates the possibility of spinning the assembly off with a starter, as the ADAPTER NUTS AND MATING WASHERS spinner is held on by a small diameter nose screw which ties into the special prop nut supplied. 10-32 Short...... 6 0 4 0 1 Vi-28 Long ...... 60405 We regularly stock a few spinners without cutouts so that if you have some special 10-32 Medium ...... 60402 5/16-24 Medium .. .. .60406 three or four blade propeller application or unusual application you could get a spinner Vi-28 Short...... 60403 5/16-24 Long...... 60407 without slots and put in your own. Vi-28 Medium ...... 60404

PROP SHAFT EXTENSIONS

Prop Shaft Extension· Fox has made a specialty of prop shaft extensions. We have evolved a light weight, compact spin'll design and a special nut and w asher design that will fit right on your prop shaft and move the propeller either one half inch or three quarter inch forward. Vi Long 10-32THD No. 90410 Also with Fox Extensions you can fit a Fox Spinner on your motor. In effect, this gives Vi Long 10-32THD No. 90411 you three different possible front end lengths — stock. Vi inch overstock and */4 inch Vi Long V1-28THD No. 90412 overstock. Think how many times you have juggled a motor block cutout or had badly Vi Long V1-28THO No. 90413 fitting front ends when a little extra length on a propeller shaft would have made things Vi Long 5/16-24THD No. 90414 come out smooth. Vi Long 5/16-24THD No. 90415 FOX MISSILE MIST DUKE’S FUEL FOX SUPERFUEL

. a-

FOX

tj As its name indicates. Fox 40-40 is 40% Fox Missile Mist is our finest general 10% Nitro 22% Oil Duke’s Fuel is a Fox Superfuel formula is basically 5% nitro methane and 40% alcohol. The re­ purpose fuel. It contains 25% nitro and popular middle of the road formula pre­ nitro and 28% oil, which makes it the most maining 20% is a mixture of natural castor 22% oil. However, it far out-performs the ferred by many for use for radio control oily fuel on the market today. This for­ oil with a small percentage of Ucon type normal 25% home brew. One reason is flying as well as control line flying. The mula was first introduced in 1952 and has synthetic to keep the carbon deposits that the nitro is a mixture of nitroethane excellence of Duke’s Fuel is not due to any remained unchanged over the years. Fox down to moderate level. Most people use and nitro-methane. in a proportion that secret formula but rather is due to the Superfuel is unexcelled in its applica­ 40-40 as an additive to a mild, low cost fuel runs as well on a hot day as on a cool day. quality of the oils used and the fact that tions. mix when they need a little extra glow plug Furthermore, nitroethane is one of the Fox fuels are consistently true to their BREAK IN - Fox Superfuel, gives any heat or a little extra oomph. However, most powerful solvents known and a formula. The oil used in Duke’s Fuel is a new motor extra protection against galling straight 40-40 is an excellent competition motor run on Missile Mist will have very blend of choice natural castor oil and what and wear during those important first few fuel in itself where performance is the little carboning or gumming problems, is probably the most expensive synthetic runs. primary consideration and price is only even with an average type muffler. oil used in model fuel today. Duke’s Fuel MOTORS WITH WORN CYLINDER secondary. We recommend that all seri­ Another remarkable feature of Missile is backed with 36 years of flying and ex­ AND PISTON FITS - The extra viscosity ous modelers carry a can of 40-40 with Mist is that your engine can be set quite perimenting with model airplane fuels. of Fox Superfuel will often hold compres­ them so they can give their regular fuel rich and the r.p.m. will drop off a smaller PINT ...... 30202 sion and extend the practical life of a mix a little extra help on those off days. Of amount than other fuels of comparable QUART...... 30203 motor long after it will not run satisfactor­ course if you are flying serious combat, nitro content. A simple switch from a less­ GALLON ...... 30205 ily on lesser fuels. it’s wonderful to pull 40-40 out of the bag er fuel to Missile Mist has solved more DRUM ...... Special Order EVERYDAY FLYING - A great many when you find yourself matched with a engine running problems than you would motors just run better on Fox Superfuel. red-hot opponent. ever imagine. PINTS ...... 30102 QUARTS...... No. 30403 PINTS ...... 30302 QUARTS ...... 30103 DRUMS...... On special order QUARTS ...... 30303 GALLONS...... 30105 GALLONS...... 30305 DRUMS ... .On Special Order DRUMS ... .On Special Order

5305 TOWSON · FORT SMITH, ARK. 72901 FOX MANUFACTURING CO. Phone 501-646-1656

FOX WHEEL FOX COLLARS SILENCERS Fox Wheel Collars are run in our own shop specifically for model airplanes. One feature of our 1975 Fox Wheel Collars is the set screw, which is a #6-40 thread. This is a finer thread than generally used and holds better. The cup on the set screw indents the piano wire and gives a firmer bite. Another feature of the Fox Wheel Collars is that the outer collar is closed and rounded off in an acorn nut type manner. This covers up the jagged wire end you so frequently see on an otherwise beautiful model. For those modelers who like to have wheel pants. Fox has a flanged wheel collar design, so rigged that a plastic wheel pant can be held onto the collar by means of a couple of small self-tapping screws supplied with the set. Wheel collars, of course, do have other uses also, such as positioning the height of nose wheels, retracting gear mechanisms, bomb-bay doors and the like.

TYPE WIRE SIZE PART NO. FLANGED WHEEL COLLARS

2-wheel regular 3/32 90331 TYPE WIRE SIZE PART NO. 3-wheel regular 3/32 90332 2-wheel regular 1/8 90341 2-wheel 1/8 90343 Wc are currently offering Fox Silencers in the open or closed front 3-wheel regular 1/8 90342 3-wheel 1/8 90344 configuration in the A and B size and the dosed front only in the C 2-wheel regular 5/32 90351 2-wheel 5/32 90353 size. We have decided to not offer the flow through in the C ike 3-wheel regular 5/32 90352 3-wheel 5/32 90354 because the larger size motors really require the more effective 2-wheel regular 3/16 90361 muffler in order to keep the neighbors somewhat pacified. You will 3-wheel regular 3/16 90362 observe from the picture that our new series mufflers have studs mi that the muffler can now be mounted from the by-pass side of the engine by means of two long screws, or from the exhaust side by FOX GARNET FOX LUSTROX means of two short screws in the studs above and below the stack. In this way you have two different options of how your muffler is Fox Garnet is a Lustrox actually is a super-fine mounted. natural product and is a polishing compound with flakes so material we have found small that they can float in between to be most successful normal running bearing surfaces for hand lapping mee- and not touch either side. It has a SIZE WT. FITS STYLE PART NO. hanile pistons to steel polishing effect when a high spot on cylinders. It should be a crankshaft, for instance, hits a A 1-1/8 0Z. Fox 15. Open Front 90211 mixed with oil into a paste form and high spot on the bearing. We regularly use a small Closed Front 90212 rubbed over the piston and then the quantity of Lustrox on all of our new motors with 8 1-3/8 0Z. Fox 19 Open Front 90221 piston can he lapped into the cylinder. bushing mains and lapped pistons, as we have found Fox 25. Fox 29 Closed Front 90222 that a motor which has been run in on Lustrox will last Fox 35 Stunt WARNING: It should not be put into much longer. To use it. mix it with oil into a thin paste Fox 36 the intake of a running motor or else in and dab a little bit into the intake of your motor while a few seconds time your motor will be running. After a minute or two the residue comingout C 1-5/8 o z . Fox Eagle 60 completely ruined. the exhaust should change from black to while. At this Fox Hawk 60 Closed Front 90232 Fox Garnet...... 90812 point Lustrox has done its work. Fox Lustrox .90811 an addition this year. A total of 178 trophies will be on the line, with the Chuck Broadhurst Memorial wheeled over to the Grand Champion (if you’ve seen pictures of this award, you’ll know what I mean), and the Ocie Randall Memorial for High Time in Gas. Trophies will be awarded to fifth place. The Events:

Saturday, 8 A.M.— 5 P.M. A Gas* C Gas A-2 Nordic Coupe d ’Hiver .020 Old Timer 30 Second Antique 6 P.M.-11 P.M. Penny Plane Peanut Scale Hand Launch Glider* Easy B Sunday 8 A.M.—5 P.M. 1/2 A Gas* FAI Power Hand Launch Glider* Uni. Rubber* A Old Timer B Old Timer C Old Timer Gas F/F Scale Rubber F/F Scale Night AM A Gas Monday 8 A .M .-3 P.M. B Gas SKETCH 2 (Adding a wash-out tab to a "flat" wing) Jr. B-C Gas* A-1 Nordic Wakefield Rocket Payload D Gas (41-65) * Junior Events Additional information can be ob­ tained by contacting Jim Scarborough, Box 393, Lawndale, CA. 90260. He’s serving as Business Manager this year. similarly amazing stories, fr instance: out pinning. After everything is in place, This is one event that all serious free Did you ever try to build a model drop a drop of Hot Stuff on each joint flighters should try to attend. I hope without using pins to hold leading edges, and pick up the finished part. Sounds this year is one that I can catch. ribs, etc. to the plans? No, says I. Easy, neat. HINTS AND TIPS sez he. Just unroll the plans and spray Howzabout this? When you cut the I had the pleasure o f speaking to the back with a good quality contact notches in the trailing edge so that the Bob Hunter (of Satellite City fame) just cem ent. . . he recommends 3M No. 77. ribs can be firm ly set into place, fill the a couple o f days ago, and was informing Press the plans onto the building board. notch with balsa dust (never seem to him of my pleasure with Hot Stuff. I Then spray a sheet o f waxed paper and have a shortage o f that) before shoving constructed a complete indoor scale old press this over the plans, then spray the the rib into place. The dust will form timer Miss America and most of an A/2 top o f the waxed paper and fit the parts around the rib t.e. and when you apply Nordic with one bottle of his super adhe­ onto the waxed paper. The contact Hot S tuff to the joint, the dust “ uni­ sive. So, he begins to inform me o f other cement holds the parts in place . . . w ith­ fies” and forms a solid joint. That's

DARNED GOOD AIRFOIL - CHEESMAN 20A-08

STATION 0 1.25 2.5 5.0 7.5 10 15 20 30 40 50 60 70 8G 90 95 100 UPPER 5.8 6.6 - 7.5 - 8.0 7.9 7.1 6.3 5.2 4.0 2.8 1.4 - 0 LOWER .68 .30 - .06 - 0 0 0 0 0 0 0 0 - 0

MAY 1975 47 1 1 T t 4 ► — ------

< ------6 " ► All ribs 1/16" sheet All3 /3spars 2" sq. ------1 2 " ______------* DADSON COUPE by John Ferrer — ______Scale Scale 1/4" = 1' Dihedral at tip 2-3/4" with main panel flat main panel dihedral 1" each side A-A r 1/8" Sq.

•c» oo MODEL BUILDER Walt Johnson inspects the plastic film covering on his Orbiteer, Bob Sifleet and his Centaur FAI Power model. Note wash-in tab on during a recent Tacoma, Washington contest. inner right wing panel. neat, unless you’re one o f those preci­ tion, Bob?). The covering method is in­ ever have the fuel line stay on? Want to sion types who cuts perfect notches. teresting, and should be passed on. Bob guarantee that it doesn’t slip o ff again? Satellite City has now begun to mar­ covered his ship with Japanese tissue Sure you do. ket Teflon Applicator tubes in separate and 4 coats o f 50/50 Nitrate dope, over­ Take a piece o f 1/8 diameter O.D. packages. An 18 inch length o f the stuff covered with silk and two more coats of thick wall copper, brass or aluminum is about 50

Bill Vernon Challenge Trophy for high time in Unlim. rubber. Yes, bottle is full. lJn GOING TO TEST ΠΥ NEW FOOLPROOF VETHERMALIZER.. MAY 1975 49 PHOTOS BY CHUCK PHOTOS Layout of the 1975 Winter Nationals, in San Jose, California. Pit area had been moved to the left of the driver's stand, for the only change made since last year's event.

tered with her California Girl funny car. She had a good qualifying time, but was eliminated in the heat races. Bev had R/C AUTO NEWS the second heat in the bag when her The 1975 San Jose Winternationals. By CHUCK HALLUM competitor spun o ff the line. However, she didn’t back o ff the throttle and hit the wall herself about 3/4 o f the way • It seems to be very difficult, for me Taipan powered, had a rocking front down the strip. The other driver had anyway, to participate in an event and end, 5.25 gear ratio, capped rear tires, recovered by then, and tripped the lights. cover all of the highlights. There just and a flexy wing. When the car went, it Gary Buriani was consistent through­ doesn’t seem to be enough time. Be­ screamed. For the acceleration and speed out the program. The car (which used tween car preparation, taking pictures, that it had, the directional stability three servos) was quite fast and went talking to people, and trying to relax a seemed to be quite good. The engine like an arrow every time. He just little (and warm up too, it was cold) just screamed all the way down to the knocked the cars o ff in his class one by before my own races, many interesting lights. It had to be going at least 25,000- one until the final showdown, when Al occurrences are missed. So the best I can 26,000 rpm. The caps are supposed to Chuck beat him. do is to report the things which attracted expand, just like on the real dragsters. Mike Carone had rail and funny cars my attention. That flexy wing may even help .. . bend­ that looked impressive. The cars have Saturday was devoted to drag racing. ing down to give less down force and run well in Southern California, but in When I arrived at the track, the drag drag as speed picked up. the eliminations, both suffered from fuel strip and lights had been set up. Several In the eliminations (2 out o f 3), Ron starvation and engine problems. Mike’s cars were making practice runs. Three put on a flying demonstration when he third servo brake systems have always hit the center dividing strip about half classes o f cars were running, dragsters, given him a good jump o ff the line. funny cars, and stock. Some o f the cars way down and went about 6 feet in the A summary o f the finals is presented were running quite well. But I was inter­ air. Pieces went every which way, but in Table I. Watching the drags is enough ested in Ron Sheldon’s dragster. Seems Ron had it back together for the next to make you want to build a drag car he has been turning 58+ mph and 3.02 heat. and get into the thick o f the excitement sec. The rail didn’t look unusual. It was Bev Newberger was the only gal en­ . .. if you’ve got the time. Easterners may not appreciate this, but it was cold ... about 50-53° .. . with the wind blowing all the time. I ended up buying a wool cap and gloves to try to keep warm. After the drag racing was completed, the road course was opened for practice. The track layout was identical to that of the 1974 Nationals. Most people seemed to like and enjoy that track. I personally like the high speed "esses" after the back straight. If you hit the entry correct, it’s full throttle . . . hard right, hard left, hard right, all the way to the start/finish line. It’s really exciting to watch the cars setting up and drifting through those corners at full throttle. The only modification to the track was to locate the pits to the left of the driver’s stand, rather than in front o f the drivers and outside the start/finish line. That got rid of the track/pit sepa­ The concours cars. Number 14 (second from top), a Steed-Lola, by Bill Bryant, was the winner. rating wall and made pitting and driving much safer.

50 MODEL BUILDER Novice races, Bill Bryant who had just taken Concours, looked very smooth, running his engine in a fast 4-cycle. Fuel was pumping out of his tank, however, and his car died. But Bill did come back and win his next heat. In the Amateur class it was quite something to watch 14 year old Willie Bennett. He drives extremely well and is the top amateur in the San Francisco bay area. Willie usually has a good line, but occasionally a missed corner fouls him up for a couple o f laps. Experience will get rid o f this then we’ll all have to watch out! In the Sportsman class, Steve Betts’ car looked good and he drove like an expert (better than a lot of them). The car really acted like it drove well. The ones that looked good in the Expert class were Gary Kyes and Earl Campbell with their super engines, then myself, Matt Azzara, and Bill Jianas. Campbell had quick time o f 4:18 in his second heat, and I had 4:19 in the first round. Kyes would have had a good Earl Campbell, winner of the trophy dash. Our reporter getting ready for a heat race. The time (he was leading me) but had clutch temperature was a little on the chilly side. and brake problems. I don’t recall too much about who Right after the heat races, there was a out to what looked like a 50 foot lead was racing on Saturday because I was 5 lap trophy dash for the four fastest (probably 20 or 30 feet) at the end of so busy with my own car. The traction cars. So it was Earl Campbell, myself, the straight. Through the esses and in­ o f the road course was not too super, Steve Betts and Willie Bennett. A Sports­ field I caught Campbell again, only to and most drivers were experiencing over­ man and an Amateur driver had beaten have him pull away on the straight. I steer. I had the same problem, but didn’t out the other super-drivers! A t the start, gave it all that I could through the esses, do anything about it because it would Campbell jumped out into the lead with but Campbell beat me by about 6 feet change by Sunday. Some oversteer is his super-engine and 5.1 gear ratio, and across the finish line. usually experienced on a dusty track, I pulled in behind Betts and Bennett I can't tell you anything about the because rear traction with power delivery with my 4.67:1 geared car. Campbell Novice and Amateur finals because I is affected more than front traction. established a good lead and Betts and was working on my car, tipping the nitro It seemed that the local racers were Bennett were driving well. I don’t re­ can, relaxing and trying to warm up, so letting the out-of-towners have the most member where I passed Betts, but I got you’ll have to just look at the tabulated time on the track. Toward the end o f by Bennett on the inside o f the corner final results. But in the Sportsman main the day, the traction was beginning to just before the start/finish line at the event, Jim Cade did a good job and improve and everybody was going pretty beginning of the fourth lap. I was even pulled out the win. He had to drive the rapidly. After the Saturday practice ses­ with Campbell by the start o f the long semi-main, and won it, I think, to make sion, I had a list of about eight things to side and back straight, and he zapped Continued on page 75 do to my car that n ight. . . Get out the midnight oil! Sunday morning came pretty fast. Most o f the racers were at the track by 8:40 AM, and official controlled prac­ tice started about 9 AM. Each contestant got two 10-minute and one 5-minute practice session. During practice, there seemed to be an unusual (?) amount o f radio problems; batteries coming un­ plugged, crystals coming loose, interfer­ ence, servos acting up etc. Then the race program was finally ready to begin. Eight cars lined up for the Concours event. They looked great, and they also were required to compete in the racing schedule. After some scrutinizing, the judges pulled out two cars, Gary Kyes’ Porsche Turbo Carerra, which ran in the drags, and Bill Bryant’s Steed-Lola, which was to run in the Novice road race. Finally, the judges awarded first place to Bryant’s sharp Steed-Lola. The 15 lap heat races for the four driver classes got going quickly. Every­ body wanted to get a good time, so they The author's Expert Main Event winner. The pressure fuel system and tank were described last were blasting around the track. In the month.

MAY 1975 51 Red Barrows, probably the most prolific builder in Southern California, with his Fiske Hanley 10 footer. Ship is now fitted with a T V camera. How'd you like to have the Monokote conession on a job like that!?

PLUG SPARKS By JOHN POND The way it works out, you can take in Before someone asks what the events all the meets and not take over two are, here is what is hoped to be staged weeks vacation! How about that? at Lake Charles: • NOW HEAR THIS! There will be another Old Timer F/F radio assist con­ test held at the Lake Charles Nationals on Wednesday, Aug. 6, at the LARKS Field (just as soon as I can get the okay from “ Bo” Hinch of the same club). Things will get going at 9:00 a.m. and knock o ff at 4:00 p.m. Last year, the events suffered from the close proxim ity o f the Lakehurst SAM Championships. Nobody from the East came to Louisiana! So, we are blowing our horns loud and strong this year for those who are in the mood to take in the Nationals in addition to the SAM O/T Champs. This is not to detract from the free flight events to be held on Friday, Aug. 8. These old timer events will be held for the eleventh consecutive year! We’re starting to grow some whiskers now! So, if you are going to the Denver SAM Championships on July 29, 30, and 31, right after the conclusion of this big meet, you should be able to find another week in your vacation schedule Arkansas' Kenny Caldwell and his latest creation, an excellently built Flying Quaker. Engine to take in Lake Charles. Honest Injun! appears to be an OK 60. 52 MODEL BUILDER When Danny Sheelds' Boehle Giant gets airborne, the weather chang­ Beautiful Super Cyclone powered Playboy Senior, by Phil Peach. es from clear to cloudy!. Seen at Lakehurst last summer. Flew at the 1974 King Orange Internats.

Wednesday, Aug. 6, All R/C assist. he found dust between his copper timer By now, the reader is thinking, "The 1. Class A-B combined (20 sec) contacts. One has to adopt Murphy’s heck with all this ignition and its attend­ 2. Class C (20 sec) Law in cases of recalcitrant ignition en­ ant problems.” The reason for all this 3. Texaco (1 /4 oz/lb.) gines; “ If it can happen, it w ill.” writeup is to encourage pre-flighting, Friday, All F/F We have been talking about ignition, that is to say, get the bugs out at home, 1. Antique but did you check to see if you have not on the field! It will pay o ff! 2. .020 Replica gas in the tank? Is gas flowing? If not, 3. Class A is the needle valve clean? Make sure your NATIONALS COMPRESSED AIR 4. Class B fuel is clean (filtered) when you put it EVENT 5. Class C in the tank. Dirty fuel, can give you fits. It is just that! Despite rumors to the 6. Rubber, Cabin How is the compression . . . not only contrary, Tim Banaszak is putting up 7. Rubber, Stick in the head but also the crankcase? If trophies for the best flying compressed 8. Rubber, Jr.-Sr. you have leaky gaskets in the crankcase, air models at Lake Charles. The event O f course, the 12th Annual O/T Re­ you’ll crank all day and fuel won’t come will be flown after 5 p.m. on at least union will be held following the Friday up the by-pass! O f course, it goes w ith­ two or three nights. Thursday night will events. This banquet is used as the vehi­ out saying, loose-fitting head gaskets be the last chance. Here are the rules in cle for awarding the trophies. This plus make starting hard. a nutshell: —*- speakers, bum jokes, and O/T movies makes the evening an extremely memor- ableone.Onceyou’ve tried it, you won’t miss one after that! IGNITION TROUBLES Just about the time this writer thought he was boring his readers to tears, several encouraging letters were received with comments that they appre­ ciated the review o f ignition setups and the problems thereof. We were doing trouble shooting last month, so we might as well continue with the various things to look for in that “ tough-to-start” engine. Okay, if you’re not one o f those heroes who place their finger on the plug to test the ignition while flipping the prop, do this: Remove the spark plug, leaving the high tension lead connected. With the plug resting on the cylinder head (for ground) turn the propeller over and see if you are getting spark across the elec­ trode gap. No spark, huh? Now check to see if all ends are con­ nected. If possible, run a continuity test with a meter to see if you have in­ ternal breaks in the wire. Condenser, connected and properly grounded? Don’t laugh, the writer got caught without his condenser connected! In addition, if you are using a cut-off timer in the cir­ cuit, check, I mean check this little jewel. The writer tore his hair out at Denver (What year was that, John? wen) until

MAY 1975 53 • The Mercury first appeared in Scien­ tific Model Airplane Co. advertisements The MERCURY in mid-summer o f 1939. Although he Designed especially for you model was never mentioned in the ads, Ben builder* who want a high performance contest nas model that will also he Shereshaw was the designer. able to '’lake It.” the SCIENTIFIC MERCURY more than meets all ex­ Typically Shereshaw in its clean, pectations. The pound thrust of the average Mi H.I* engine exceeds the functional lines, it was unlike Shereshaw total weight of the ship and her flight characteristics make it possible for her in its exceptionally easy construction. to bans on her prop and climb straight up with no tendency to loop! Λ slow Most o f his designs, such as the Custom roll after the motor cuts brings her out on top as she starts her long flat glide Cavalier and the Nimbus, were nine and to earth. The stress analysed structure of this new model enables her to with­ ten foot streamliners, and were also maj­ stand excessive flight loads as well as those Imposed by hard landings. Λ few or building projects. of the many features to he found on the MERCURY are: staggered tail surfaces, Close inspection o f the incidence ang­ as protection against spinning; a taper­ ed wing, for greater flying efllelency; les as shown on the original plans indi­ ' and a reinforced front end for the nose of n successful gas model mint he a»*lc to withstand not only Severe motor vibration hut also the impact of cate a very small angular difference be­ lan din g. The full SiXV illustrated plan of the MERCURY makes her easy to hulld too. What el*« could you ask tween wing and stab. However, the stab for in a gos model? Wingspan O ft.. Over-All length 52". Weight complete with motor and ignition units 2*«.| 1»**. The kit Is complete with all necessary materials including a pair of 31·. in. streamline nolna wheel* and a full s49á has a symmetrical section. Still, it is ad­ ■ M o to r PRICK d ” A T lh Con,‘’ U·1« t,ircct,onB- Γ ·° your dealer today to see this SclontlAeally designed airplane. visable to be very careful when installing _ MERCURY DELUXE KIT . . . for a little more. SCIENTIFIC offers every­ SIJ95 MERCURY DeLuxe—thing , the same as above, plus the addition of yellow, blue and gold the stab to avoid a 0-0 set-up. The climb SCIENTIFIC dope and a pair of 31/«." pneumatic rubber wheels (In place of halsn-wheels). A real Mg Sift.00 would be great, but watch the transition! The Mercury should make an excell­ OLD TIMER Model of the Month ent R/C design, and with the tail surface location, the installation could be well SCIENTIFIC Designed by: Ben Shereshaw disguised. With a wing area o f approxi­ Redrawn by: Phil Bernhardt mately 765 sq. in., the maximum glow MERCURY Text by: Bill Northrop engine size would be a .30. · 54 MODEL BUILDER MOTOR OF THE MONTH In line With the policy o f presenting an engine three-view each month (drawn by Tex Newman) no self respecting en­ gine collector would be found dead without an Ohlsson Gold Seal. This ex­ cellent engine, despite its large produc­ tion, it still regarded as a rare engine. In sketching a little history, it must be recalled that winning the California State Fair meet was regarded as the big contest in the West. Fortunes were made from engines that won the prestigious

- -) gasevent. Bill Atwood won in 1935, and the Baby Cyclone was successfully launched. But that’s another story we will feature next month. •W Λ . « f Winning the California State Fair Gas Event eluded Irwin Ohlsson until 1937. When he finally won first place, he was awarded the Gold Seal, indicating first place. From tin is, the engine inherited its name, Ohlsson Gold Seal. The rest is history. Success after success followed Ohlsson and Rice until they were the largest engine manufacturer in the game. With the advent o f the glow plug, the partnership was terminated and another great company faded from the scene. CONTESTS What, already? Yep, in California you can fly year ’round. Three small meets have been held consisting o f two in Southern California . . . Scamps Kick­ o ff and Thermal Thumbers O/T Wake­ field . . . and the Northern Calif. AMPS. Biggest competition developing is in .020 Replica. The boys are getting so good that if you drop one max flight in six, you have had it! Maybe if it were restricted to the first three flights there *9000. BUILDER might be more dropouts? Ptmn N a STS-O lTI The Wakefield boys are putting up such good times. This event is appealing to the modern rubber power modeler. Used to be a time when it was cheaper to fly rubber, but with the price of a Continued on page 82 1. Flights may be made anytime dur­ ing the Nats week before the 0 /T Re­ union Banquet. 2. Engines will be limited to 150 psi working pressure (CO2 engines not al­ lowed). 3. Three officials, each flight limited to three minutes. 4. An attempt is any flight under 20 seconds (unless declared official by contestant). 5. All flights must rise-off-ground (R.O.G.). 6. Helium will not be permitted in tank. 7. All models will be processed and timed under the direction of Tim Bana- szak. 8. Entry fee will be $1.50 (to help defray trophy costs). Tim further states that if time per­ mits, he will fly demonstration flights Bob Shafer, Spokane, Washington, built this Brown powered Miss Philadelphia . . . 8-1/2 feet of at the Denver SAM Champs. majestic nostalgia . . . MB editior's first gas model . . . sigh . . . MAY 1975 55 A group of excellent C/L scale ships seen at last year's Flightmaster's Annual.

FROM THE HANDLE” ontrol line By JED KUSIK

• "Start your two minute warm up ... compounds are manufactured in South­ walk into any one of hundreds o f local N o w !. . . ern California! motorcycle shops and select, o ff the Minus one-minute . . . Most of these new lubricants are man­ shelf, from as many as 35 different oils. Minus 30 seconds, all engines stop! ufactured for motorcycle racing. I real­ That was the count made the last time Pilots. . . Handles on the ground. ize that motorcycle racing takes place I tried. It is probably larger now. Mechanics. . . stand by your model in all parts o f the country, but in addi­ Last summer at the Nationals I was tion to the two dozen or more race running out of my favorite oil, so we 5—4—3—2—1 —GO!” tracks around Los Angeles and San just trucked on down to the local motor­ You have just memorized the exciting Diego counties, we have the largest race cycle shop (singular, and hard to find), start procedure for F.A.I. team racing. course in the world; capable of starting layed a bit o f racer jive on them just for This is just another of my clever and 3,000 racers on one line (no exaggera­ effect, and nonchalantly asked for a devious methods designed to spread the tion, it’s been done)! We affectionately quart o f Double Blast MX oil. The reply F.A.I. C.L.A.U.S. throughout the United refer to it as the Great Mojave Desert was similar to this. "You want what, States. Course. boy? We got this here oil on the shelf.” A THREE LETTER WORD ACROSS; The interest is just naturally here . . . I counted three brands o f crude oil, MEANING GREASY KID STUFF, and so are the oil manufacturers. I can Continued on page 66 AFRO-SHEEN, FRENCH FRIES, AND MODEL AIRPLANES. Answer: OIL I could make a cheap pun here, such as, “ This is a very sticky subject," but I will not do that. One o f the first questions asked o f anyone who flies competition is about what oil they are using. Answers vary greatly and often times start arguments. There are so many new compounds being developed for lubrication that it is now really impossible to know what is actual­ ly the best. In the February issue o f MODEL BUILDER, I listed the results o f testing done by Charlie Johnson, o f San Diego, with his Slow Rat models. O f the several letters received on the subject, two in particular reminded me of a problem that exists everywhere except in South­ ern California . . . The problem o f avail­ ability. It seems that most of the new oil 56 MODEL BUILDER ES SLASHED ON HEATHKIT CHANNEL R/C GEAR Big Savings on Singíe- and Dual-Stick Transmitters; Lightweight Receiver Famous Heathkit R/C equipment at unbeatable sale prices. Exclusive Heath-designed IC’s in the transmitters and receiver increase reliability while reducing size and weight. At these low prices, we don’t think you can find a better buy. GDA-405-A Single-Stick Transmitter — Provides one-hand, simultaneous control of three independ­ ent channels. The stick's gimbal coupling actuates two functions, while the third is controlled by the return-to-center knob on top of the stick. GDA-405-D Dual-Stick Transmitter — Two-hand control of four independent channels. Friction ad­ justment removes tension from one function of each stick to maintain the control at any position you set. Both transmitters have the same versatile features -trim -adjust tabs, relative power meter, two-posi­ tion switch for landing gear, finger-adjust tabs for auxiliary functions, coin-switch selection of two adjacent channels (except when 75.640 is speci­ fied), trainer link, servo travel adjustments for each S a v e Even M ore channel. Simultaneously recharges transmittér and ...When You Buy A System receiver batteries. The lightweight receiver weighs in at just 2.5 ounc­ The systems include your es. For convenience, it has a plug-in connector choice of single-stick or block to simplify battery and servo hookups, an dual-stick 8-channel external on/off switch and two-channel frequency transmitters, the GDA- selector. 405-2 receiver with the GDA-405-3 battery pack And, like all Heathkit products, the transmitters and your choice of 4 ser­ and receiver are amazingly easy to assemble, fol­ vos (GDA-505-44, sub­ lowing the illustrated, step-by-step instructions. miniature or GDA-405-44, Even a novice can enjoy building them — and miniature). And all sys­ everyone will enjoy the savings. tems include all batteries — a retail value worth up Kit GDA-405-S, Single Stick Transmitter, to $39. was 144.95 ...... Sale 109.95* Complete Single-Stick Kit GDA-405-D, Dual Stick Transmitter, System ...... 244.95* was 124.95 ...... Sale 99.95* Complete Dual-Stick System ...... 234.95* Kit GDA-405-2, Receiver, was 59.95 . Sale 49.95* HEATHKIT ELECTRONIC CENTERS - Unit· ol Schlumberger Products Corporation Retail prices slightly higher. Send HEATH ARIZ.: Phoenix; CALIF.: Anaheim, El Cerrito, Los An­ I Heath Company geles. Pomona. Redwood City, San Diego (La Mesa), for Dept. 238-05 Schlumberger Woodland Hills; COLO.: Denver; CONN.: Hartlord your Benton Harbor, Michigan 49022 (Avon); FLA.: Miami (Hialeah), Tampa; GA.: Atlanta; 1 ILL.: Chicago, Downers Grove; IND.: Indianapolis; FREE KANSAS: Kansas City (Mission); KY.: Louisville; LA.: Please send my free 1975 Heathkit Catalog. New Orleans (Kenner); MD.: Baltimore, Rockville; Heathkit 1 MASS.: Boston (Wellesley); MICH.: Oetroit; MINN.: Min­ Name I neapolis (Hopkins); MO.: St. Louis (Bridgeton); NEB.: Catalog Omaha; N.J.: Fair Lawn; N.Y.: Buffalo (Amherst), New today — , 1 1 A H r ir e A s 1 York City, Jericho (L.I.), Rochester, White Plains; OHIO: 1 Cincinnati (Woodlawn), Cleveland, Columbus, Toledo: the world’s largest PA.: Philadelphia, Pittsburgh; R.I.: Providence (War­ selection of 1 Pity Stale ___ Zip J wick); TEXAS: Dallas, Houston; VA Norfolk (Va. 1 PRICES A SPECIFICATIONS SUBJECT TO CHANOE WITHOUT NOTICE RC-110 1 Beach); WASH.: Seattle; WIS.: Milwaukee electronic kits! 1 »MAIL ORDER PRICES; F.O.B. FACTORY.

MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 57 with those 1-inch tip blocks? Surely this NFFS MEMBERSHIP AND RENEWAL APPLICATION sub-standard size would please those en­ (Make checks payable to; National Free Flight Society) thusiasts who are all excited about a Mail to; Two-Meter (78.74 inch) Class. FEES B.). Kelch, R.R.4, Box 475, The hottest flames in this political W. Terre Haute, Ind., 47885 1 yr 2 yrs bonfire called Standard Class seem to be RESIDENTS OF FOREIGN COUNTRIES S6.00 S11.00 fed by the number-of-controls disagree­ Age 19 AMA Members 6.00 11.00 ment. The basic proposal is very specific: U.S. and up Non AMA Members 7.00 13.00 control functions shall be two in num­ RESI- Age 15, 16, 17, and 18(Senior) 3.50 6.00 ber, rudder and elevator. Period. The DENTS Age 14 and under(Junior) 1.50 2 5 0 proponents o f this philosophy are quite Family membership* 1.00 2.00 concerned that without this limitation, the cost and complexity o f basic R/C Family membership fee includes sailplanes would discourage the "aver­ all additional family members, but Address age,” the new, or the young flier. The no additional copies of the Digest counter position cries out for no, that’s Ages are as of July 1 of current City, State Zip year. Please circle applicable fees. NO, restrictions. It would be a tragedy if new starts in New Member □ •Please list family members Name the sport were cut-off or even reduced Renewal □ to any significant degree. R/C soaring Address Change Π AMA No. has enjoyed phenomenal growth from Current expiration date its very inception . . . and the rate keeps Month Year increasing. Wonder how that happens without protective legislation? R/C Soaring . . . Continued from page23 sense . . . and less waste . . . than 100- No one can build a valid argument that with even an 84-inch, one-piece inches. Granted, the 9-foot span would against motherhood, apple pie, and econ­ wing. The 100-inch span can be trans­ require some splicing . . . as does every omy ... if the pregnancy is legitimate, ported only in a large automobile, a 100-inch wing with polyhedral or a cen­ the apples are fresh, and the savings real. station wagon or van . . . unless built in ter dihedral joint. Those are splices, no But two controls... be they rudder and two or more panels. And when multiple matter what else they may be called. elevator or any other combination__ panels are considered, lengths up to six Maybe Standard Class spans should do not necessarily effect true economy. feet are about as easy to handle as 50- be more like 108 (9 x 12) plus 2 inches And what about the guy who wants to inch pieces. for tips and a couple for fuselage width. obtain directional control o f his sailplane Economy? One o f the major justifi­ Total: 112 inches. Certainly not a per­ by ailerons instead o f rudder . . . or pitch cations for the 100-inch wingspan model fect dimension . . . maybe there is no control by CG weight shift or wing angle seems to be based on material utilization. optimum size . . . but anything between o f incidence change? Sure, he’s some The argument is that standard length about 108 and 120 inches seems to make kind of a nut cause he thinks “ funny” sheet and strip can be used without as much sense as 100 .. . using the argu­ . . . but he’s only using two controls. waste. The new builder doesn't have to ments set forth for the 100-inch limita­ No reason to fear new ideas, they’re make splices. Right on . . . assuming tion. Some folks might fuss about all the seldom any good . . . A t first. 48-inch stock and V-dihedral. There may extra covering material required for the Then there’s the problem of equip­ be a couple o f fallacies here. Like 48-inch larger size wings. Chances are the real ment limitations. A simple two-control stock is very difficult to g e t. . . and it difference in material required for an R/C system usually w ill cost less than a ain’t goin’ to get easier. . . and it is ex­ additional lO or 12 inches o f span would similar quality three-control rig ... by pensive. Ask any scratch builder. . . or be lost in the waste factor. maybe $30 or $40 or so. To reduce con­ manufacturer. How many Standard Class Should serious consideration be given fusion, it w ill be best to not compare kits use 48-inch wood right now ... in to sizes smaller than 100 inches? Why the price of factory-built, two-control 48-inch kit boxes on hobby dealers' not 72-inch wingspan maximum for systems with buyer-assembled three-con­ shelves? And how many Standard Class Standard Class? If the arguments for­ trol kits. The hard part is that the guy designs nowin the field have V-dihedral? warded for the 100-inch dimension are who puts his money into a two-control Most seem to feature polyhedral. valid, they should be even more valid system . . . consistent with the intent Realistically, 36-inch material stock for something less than 100. Lots of and reasoning o f the Basic Sailplane Class modules could be used to define an eco­ happy hours have been flown around this proposal . . . may want to “ grow” before nomical configuration. That means that country with Bob Hahn’s L il’ T design too long. Maybe the idea o f spoilers or 6 or 9-foot spans would make more . . . all six feet o f it. Or was it 74 inches flaps becomes appealing, or a bigger, more complex sailplane. Or maybe he NATIONAL SOCIETY OF RADIO CONTROL AEROBATICS gets a hankerin’ for a b it o f very basic NEW MEMBERSHIP AND RENEWAL FORM Please PRINT (Rudder, Elevator, Throttle) power fly ­ ing. His brand new, economy radio set sorta runs out o f potential real quick. Name AMA No. More new gear is called f o r . . . and may­ be he doesn’t want or need an invest­ Address ment in two sets. So he sells the two- control rig . . . and takes gas. Economy? City State . Zip Hmmm. But he doesn’t have to buy the two- Competition Classification: α Π b D C/DN □ C/DE □ control set, he can purchase up to eight . . . or whatever is available. It’s just that NEW □ RENEWAL□ NSRCA No______by using only two, an economy status has been maintained. Sure it has . . . Dues are $4.00 for one year. Send check or Money Order to: There was once a racehorse tout who told his old betting buddy, "Sure hope NSRCA, c/o Sally Brown, 8534 Huddleston Drive, Cincinnati, Ohio 45236 we break even today. I need the money.”

58 MODEL BUILDER DATE REC'D. SOCIETY OF ANTIQUE MODELERS

MEMBERSHIP APPLICATION NO. DO NOT WRITE IN THIS SPACE I hereby make application for individual membership in the Society of Antique Modelers.

NAME ______BIRTH DATE ______YEARS MODELING

ADDRESS CITY STATE ZIP Please check if you belong to any of the following: Note: Membership includes 15% discount on one year MODEL BUILDER Magazine subscription. Give S. A. M. No. when subscribing. A. M. A. NO. Enclose Membership Dues of S3.00 and send to: Society of Antique Modelers Μ. E. C. A. NO.. 1947 Superior Avenue S. A. M. CHAPTER NO.. Whiting. Indiana 46394 In making this application for membership to the Society of Antique Modelers, I agree to abide by the rules set by the Society and realize that the goals of S. A. M. and the Old Timers movement are to encourage participation above competition and is dedicated to the preservation and reproduction of vintage model aircraft. ______Signed ------Wonder why that story came to mind? For what it’s worth, few if any ... like are going to get to looking a lot alike. Oh well. none. . . o f the major contests on the So why wouldn’t a wing area limitation If this altruism is real and economy West Coast have ever been won by a only ... no wing span regulations ... is really the name of the game . . . if we third function . . . including thermal snif­ make more sense? I t ’s the only way to really want to attract new flyers and fers. That’s strong talk and can’t be make a real separation between classes maintain a competition class for the backed up, but if it ain’t absolutely true, ...a s k any free-flighter. . . and who more casual pilots ... why not offer a it ’s damned close. cares if a guy wants to build a long skin- one-year, no-dues club membership and There’s a lot of talk about hot shot ney wing or a short fat one? Both have free contest entry for the first flying pilots that fly big, complex machines advantages and drawbacks. Let each guy season? That would show real concern with spoilers, flaps, sniffers and every­ choose for himself. How much area for in cost reduction for the mythical “ aver­ thing else. These legendary characters Standard? That’s one for the rule makers age” sportsman. Any takers? take the hardware home with disgusting to debate. And another point o f interest. This regularity. Anybody who claims it ’s the One other thing might be considered rules proposal exercise is for national sailplane and all the fancy controls that’s in this verbage . . . the size o f contests. competition. The simple, inexpensive stealing the marbles has got to be kid­ Experience has shown that about 100 sailplane category is intended to attract ding. The same guys would come out on contestants is optimum for a major con- new contestants to the excitement and top if they were flying a piano box lid. flab. Has to do with frequency availabil­ exhilaration o f contest flying. The logical They’re good . . . and, sure, there’s a d if­ ity, launch equipment and such. Multiple result, o f course, is participation in ma­ ference in sailplanes. But there’s more classes double the on-field administra­ jor events. There is no average, but a difference in piloting skills. tive chores lots o f times, makes score- typical two-day soaring contest can re­ I’m never so impressed with my own keeping more cumbersome, and double quire a cash outlay that approaches the design genius as when Rick Walters or the cost o f trophies. A small point? Not retail value o f a two-control radio sys­ some other smart alec kid flys my sail­ if you’ve got the paperwork duty. Be­ tem. Considering realistic transportation planes. Fantastic. Super ships every one. sides, a 100-man contest sorta becomes costs, one or two nights in a motel, But somehow things kinda go stale when a 50-man (Chauvinist pig! signed Bar­ meals, banquet ticket and entry fee . . . I’ve got the transmitter. Amazing how bara) contest for each o f two classes. it can ruin a hundred dollar bill without many kit manufacturers have discovered It ’s got to be more fun to place 12th out even panting hard. this fast path to success. Amazing. of a hundred than 6th of fifty. That’s 88 How about adding to the rules pro­ The guy with extra controls or func­ instead o f 44 that ya whupped . . . or is posal that no Standard Class entry fee tions doesn’t have it all going his way. it 87 and 43? can exceed $2.00 for any single contest, He’s got to lift the additional servos, We.., by now we should have about and that associated banquet tickets shall linkages and the like. He’s got to build everybody mad at us. It’s either going to not be more than $3.00 per plate for and maintain a more complicated ma­ be awfully noisy or very quiet at the fly­ Standard Class contestants and their chine. If he can do all that and still out- ing field. We may have to dye our hair guests? That, too, would show real con­ fly everyone else, maybe he deserves the and wear funny glasses at the next big cern in cost reduction for the mythical recognition. And since when are rudder- contest. Been wanting to try some o f "average” sportsman. Any takers? vators so cotton-picking simple that Northrop’s Grecian Formula 16, anyhow Wonder how many club officers are they’re specifically approved, yet aile­ (You still don't believe it, do you Le? thinking, “ That is ridiculous. No dues? rons are just too much? wen). The next banquet really ought to And we can’t make profit for the club Wonder when a proposal for Rudder- be somethin’ else. A bit o f Ole Sauce is with a $2.00 entry fee ... or have a only Class Sailplane will arrive at AMA a great tongue lubricant, and, oh, how posh banquet at $3.00 a plate.” Ooops. headquarters? Should proportional be the words do flow after just a couple o f Sorry. The ideas were impertinent. allowed to compete with escapements? transfusions. It won’t be the first time A couple of other quickies now and The wing area limitation submitted as we’ve been hit by flak and other sub­ we’ll move on. a cross proposal would seem to have stances. Them Texas crowds can get real It might be interesting to check the some merit. If only span is regulated, ornery. contests around the country and see Standard and Open Class could have Let’s make one thing perfectly clear how many folks are flying sailplanes similar areas in lots o f cases. That doesn’t . . . to use the Southern California verna­ with more than two controls ... what­ seem right for some reason. But low cular. Everyone o f us owes a debt o f ever size or class. Next thing is to find aspect ratio Standard Class designs could appreciation to every guy who has ever out how many winners had more than easily have more lifting surface than submitted a rules proposal to AMA. You two controls ... and then, how many many o f the high aspect ratio Open big­ and I can sit on our duffs, make smart winners were winners because o f the gies. By combining wing area limits and remarks, gripe and take pot shots at additional control(s). Or in spite o f ’em. span maximums, wing chord dimensions those few who have the courage, interest

MAY 1975 59 GOLDEN AGE ACCESSORIES swers to what some folks see as a prob­ SCALE ENGINE KITS SPINNERS SCALE PILOTS lem. The only really important thing is f that whatever happens, i t ’s what you ) ® 0f ^ want.. . for reasons that make sense to you. IV»" THROUGH 3% " DIA. Now this column isn’t going to turn VINTAGE WHEELS into a forum. If ya just gotta hurt me, go ahead and write. But if you want to do some good for soaring, write your R/C Contest Board person. NOW! The bad guys are .. . whomever they may be in your eyes. WRIGHT J-5 "WHIRLWIND" V i" THROUGH 5" DIA. Do we have a proposal . . . or an ax SMOOTH CONTOUR WHEELS to grind? No way. Our ideas went down the tubes a couple o f years ago. Just so happens that we’re philosophically op­ posed to all restrictions and limitations . . . NO classes. There’s enough o f that SPORTSMAN statutory kind of stuff in this life with­ P & W "WASP" UNIVERSAL o AVAILABLE IN 1" out it being imposed on our sport. Guess Γ. 1’/i", & 2" '/»", V*" V i" THROUGH 5V i" DIA. THROUGH 2Ve" SCALE we have a thing for free-enterprise, open SEND 25c FOR COMPLETE ILLUSTRATED CATALOG competition, nickle beer, and let he who DEPT. MB · 181 PAWNEE STREET is best stand up and prove it against all SAN MARCOS, CALIFORNIA 92069 comers in a clean, wide-open contest. It seems to us that imagination and chal­ lenge, like supply and demand, can be a powerful stabilizing force. REMC0 29 ?GNLm™ THE LARGEST Well... maybe in the next world. PLANS COLLECTION! RADIO CONTROL CONTEST BOARD PRICE $42.50 ENGINE 1 Dist. I: Doug Allredd, 38 Summit Rd., (engine only) Lexington, MA 02173 Plus $1.25 O. T. F/F LIST...... 75^ Dist. II: George Buso, 11 Maple Ln., for postage RUBBER/TOW L IN E ------75e! and insurance. Hyde Park, NY 12538 O. T. FLYING SCALE - - - 75i Dist. Ill: Don Lowe, 2710 N. Kings $51.00 Arms Cir., Centerville, OH 45440 Complete-- Dist. IV: George Hill, 4106 Breeze- with iqnition JOHN POND wood Ln., Amandale, VA 22003 package (coil. » t I I k condenser, plug. Old Time Plan Service Dist. V: Don Coleman, 527 Pecan St., Box 436, Citronelle, AL 36552 Plus $1.25 for postage ý P.O.Box 3113 Dist. V I: Bob Underwood,4109 Con­ and insurance. f San Jose, Calif. 95156 cord Oaks Drive, St. Louis, MO 63128 REMCO MFG. CO. Phone (408) 292-3382 Dist. V II: Peter Waters, 31219 Ken­ P.O.Box 22414, Denver, Colo. 80222 dall, Livonia, Ml 48154 Dist. V III: David Hvde, 8823 Bound- and vision to put it on paper and let it from you . . . because the bad guys al­ brook Ct., Dallas, TX 75321 all hang out. It takes g uts. . . ’cause ways make a lot o f noise about their Dist. IX: Loren Tregellas, 3003 S. Monday morning quarterbacks can flaunt ideas. Sometimes they even get orga­ Everett, Wichita, KS 67217 their 20/20 hindsight for years after a nized and really come on strong. How’s Dist. X: Bill Northrop, Jr., 1105 controversy is dead and buried. the rep to know? Spurgeon, Santa Ana, CA 92701 No one suggests that automatic agree­ Now for the wrap-up and disclaimers. Dist. XI: Ralph Brooke, 3431 S. ment with any proposal is required, but If we have been unkind, unfair, un­ 194th, Seattle, WA 98188 · intelligent analysis and logical response thinking or even ruffled the feathers o f through recognized channels o f com­ any o f the proposal writers, we apolo­ Fleet...... Continued from page 13 munication is only reasonable. In the gize right here and right now. Most of wire. Solder only the upper front joint, case o f our sport, the AM A R/C Contest them are personal friends and Old Fly­ not the lower rear connection. Board representative in your AMA dis­ ing Buddies, and any that aren’t . . . we’d Carefully draw a “ T ” shaped diagram trict is the ONLY guy who has a direct like to think ... will be when the oppor­ on a large table or similar flat surface. vote on AMA R/C Soaring Rules . . . no tunity arises. (Well there goes the image Make sure the two lines are exactly per­ matter what you may have heard. Any­ . . . must be mellowing with age.) pendicular to each other. Place three body else or any organization only The purpose here has been to open pieces of masking tape on the upper side serves in an advisory capacity to the up some ideas and look inside. Any one o f the top line o f the “ T ,” about 20 Contest Board. Keep that in mind, and or combination of the proposals submit­ inches apart, with the center piece lo­ don’t let anybody give you any jazz ted to date could make interesting and cated where the vertical line o f the "T " about it. lively competition o f Standard Class sail­ meets the top. Place another piece o f If you have an interest in Standard planes. Sometimes the reasons for the tape on the vertical line and 30 inches Class R/C soaring, contact your R/C particular concepts leave something to away from the tape at the intersection. Contest Board representative. (Names be desired. Or do they? Draw the vertical line on the two center and Addresses are listed at the end o f The 100-inch, two-control sailplane tapes. Place top wing upside down on this column.) Your guy may or may not may be exactly what the world needs. It the table so that the leading edge lines have personal knowledge of soaring, and may be the ultimate solution to famine up with the three front tapes and is cen­ he depends on input from the member­ and pestilence . . . or it may be just one tered on the middle tape mark. ship to guide his voting. He better hear o f an infinite variety o f reasonable an­ Carefully place the fuselage upside

6 0 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER pulse commander A QUALITY PULSE PROPORTIONAL RUDDER-ONLY SYSTEM FOR THE NOVICE AND SPORT FLIER.

—New LED charge indicator lamp! —Improved circuitry for even greater dependability! —New transmitter antenna mount system for a more attractive package!

Due to its small size, lightweight, simplicity, and low cost the Pulse Commander offers an ideal system for someone on a budget wanting to get into R/C flying or needing a second system for fun flying. Flight pack weights start at 2.5 oz. for the Baby System which is small enough to go into **'*vpft VffØfvV ^ .010 powered planes. I Units are completely wired and tested with airborne nicads and charger.

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BABY TWIN SHOWN dicl& dream AN AIRPLANE FOR THE BEGINNER AND SPORT FLIER. DESIGNED FOR THE BABY OR BABY TWIN SYSTEM.

SPAN: 32 in. WEIGHT: 12-14oz. AREA: 175 sq. in. POWER: Pee Wee or 13L100 DICK'S DREAM K IT $8.95 LENGTH: 25 in. Tee Dee .020

BOX 511, 116 W. 19th ST., HIGGINSVILLE, MO., 64037 NAME______USE THE COUPON TO GET OUR COMPLETE ADDRESS______CATALOG. $1.00 C ITY ______STATE ______ZIP ____ ADD $ .50 FOR 1ST CLASS M AIL RETURN. BankAmericard/Mastercharge Number. q u a n C A T. NO. ITEM

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MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 61 KING FISH

KIT B24 $24.95

Patterned after the sleek Ocean going Sailing Yachts, the King Fish is a beautiful sight on the water or on your mantlepiece. Fine per­ formance is the keynote when operating Free Sailing or Radio Control. Construction is un­ believably simple. Inter-notched Die-Cut Frame features Plywood for strength and long life. Printed-planked Deck is die-cut and ready to slip into the Rub Rail molded into the sleek Plastic Hull which is finished except for minor trimming. Kit is unusually complete and fea­ tures Mahogany Deck Cabins and trim, Brass Chain, Cast Metal Fittings, Cloth Sails, Rigging Cordage, Mast and Boom Material, Metal Rud­ der. Metal Keel comes with Lead Ballast cast in place. Step-by-Step Plans show simple as­ sembly as well as operating instructions. Base shown not included.

HEIGHT 43" LENGTH 34" BEAM 6Ά"

STERLING MODELS . 3620 G' ST. PHILA., PA. 19134. If no dealer available, direct orders accepted —with 10‘> additional charae for handlmq and shipping (60c minimum m U S . $t 25 minimum outs>de U S ) y □ Catalog of entire bne of airplane control fcne model kits R/C scale and Tracer kits, boat model kits, accessories, etc 50c enclosed Secrets of Model Airplane Budding " Including design, construc­ tion. covering, finishing, »tying, adjusting, control systems, etc 25c enclosed Secrets of Control Line and Carrier Flying.' Including prefkght. sokxng. stunting. Carrier rules and regulations. Carrier ftymg hints and control line installation instructions 25c enclosed No checks Onty U S money orders or currency accepted

Nam e______

Address______City ______State ______Zip ______

KIT D IO $12.95 6 pock — 10 lbs.

This 1883 Barkentine is the last Square Rigged Ship of the Portuguese Fishing Fleet, which yearly sailed to the Grand Banks. It is now a part of the Philadelphia Maritime Museum, and is permanently moored at its own Dock, Pier 15 North, Delaware River. Our Kit is rel­ atively easy to build and features Step-by-Step Assembly, as well as Rigging. Plans guide you unerringly thru hours of pleasure. Exquisitely detailed Kit contains Printed Cloth Sails, Ma­ chine Carved Pattern Grade Pine (or similar) Tapered Masts and Yards, two colors two sizes Rigging Cordage, Authentic Decals and Flags, beautifully detailed Cast Metal Fittings, Mount­ ing Pedestals and Base etc. HEIGHT 8" LENGTH 14"

62 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER For For Free Flight, Control Line or Radio Control Nose Canopy, Top Canopy, Navigator’s Canopy, Top Bubble, Canopy, Nose Parts, Wheels, Authentic Decals, Hardware supplied), Gas, C02 Engine, or Electric Motor. like Model. ner Enclosure, Cowlings included and Nacelles. is Also Covering Material, Formed (that Wire includes Control Line Parts) etc. etc. Kit simplify assembly. Included are Chin Turret, can be built many ways: Rubber Powered (as orStatic Scale.*Museum­ version Any a makes tions. Many highly detailed and Plastic Parts Top Turret, Ball Turret, Tail Tail Canopy, Gun­ FT. FT. SPAN 39” LENGTH 28/2” = / SCALE: Va" Prototype. Prototype. Frame members accuratelyare Die- numbered to insure fast accurate assembly as shown shown on the Step-by-Step Plans and instruc­ Cut Cut from finest quality Balsa and every part Designed Designed and built pany, by the Boeing legendary Aircraft B17 "the guts Com­ Flyingand backboneourof Fortress aerial offensive” was fire power of its thirteen Guns and 50 caliber the abled Machine the special Squadron to formation penetrate tory enemy terri­ flying, without en­ fighterfaithful escort. and Our highly Model is detailed a replica of the as as General Hap Arnold put it. The tremendous ______City Slate Zip — ______Secrets of Model Airplane Building construc­ design, Including Secrets of Control Line and Carrier Flying including prefligh, Other power and equipment not included. and Trainer kits, and kits, modelTrainer boat kits etc accessories, enclosed 50c 25c enclosed soloing, stunting. Carner rules and regulations. Carrier flying hints hints flying stunting. soloing, Carrier regulations. Carner and rules Catalog entire of line of airplanecontrol kits model line scale R/C tion. covering, finishing, flying, adjusting, control systems, etc checks Only U S money orders or currency accepted *Dry Kit. Rubber supplied. Power Material additional charae lor handima and shipping (60c minimum If If no dealer available, direct orders accepted U S •n . $1 25 —with minimum outside U S ) 10- Name Address STERLING MODELS · 3620 G‘ ST. PHILA.. PA. 19134. ) a ( MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! Φ and control line installation instructions 25c enclosed No sanding where needed from the wing saddles. When you can remove and re­ seat the wing in the saddle and it lines up with the top wing, then you’re ready ^ r° HED F I N I S H to secure the bottom wing. Apply cement to the rear edge o f the SPRAY or BRUSH/SATIN or GLOSS landing gear plate, slip the Leading Edge Mounting Plate onto the dowels and re­ You have a CHOICE with seat the wing. Check the alignment once more and while holding the wing firmly in place, carefully slide the mounting KSB SUPER POXY plate up against the L.G. plate. Estimate as closely as possible, the positions o f the trailing edge screw holes PAINT & CATALYST over the holes in the mounting block and The easiest to apply and most drill or cut out the holes in the trailing durable EPOXY PAINT AVAILABLE edge. With the wing in place and care­ The "Ultimate Finish” fully aligned, cut away any material nec­ A development of the space age, essary from the holes, so that the bolts Super Poxy Paint is formulated can be inserted w ithout interference. exclusively for models... mix and The plywood wing reinforcement plate use (NO WAITING TIM E- NO HAND should be installed after the wing is RUBBING). Fast curing. Quick dry­ covered. ing. Sets up rapidly. Minimum dust adherence. Stays glossy longer. With the wing and fuselage assembly Least affected by ultra-violet sun still in place, assemble the two N struts rays or manufactured fuels. over the plan. Bend four DuBro Gear 11 BASIC COLORS Strap-on plates at right angles and screw Red · Blue · Yellow · Orange into mounting plates on the wings, with • White · Black · Aluminum · Metal­ the No. 2 X 3/8 s.m. screws. lic Green · Metallic Blue · Metallic Carefully insert the N strut assemblies Red · our own K & B Purple · All above packed in ViPt. or ViPt.cans. and epoxy them to the strap-on plates. LANDING GEAR ASSEMBLY plus 22 ADDITIONAL COLORS available by mixing Bend the music wire struts per the CATALYSTS CLEAR and PRIMER • THINNER drawing. The 5/32 main strut is 18 in­ CDDAViKir — Satin or Gloss SPRAYING _ i /4 pt or i/2 Pt PRIMER CATALYST For use with K S B SUPER POXY- ches long and the 1/8 inch rear strut is Pints or Quarts cut 14 inches long. The optional 1/16 BRUSHING -S a tino r Gloss V4 Pt. only — 1/4 Pt. or 1/2 Pt. undercarriage struts are 9 inches. Check alignment of wheel axles so ™ - K & B FIBERGLASS-for covering K&B SUPER POXY RESIN-for u— The highest quality, toughest weave- sealing and applying glass cloth that they are in line with each other. libergiass available. For use with poly­ Created to include all the characteristics An easy way to check this is to lay the ester or epoxy resin. Excellent contour­ desirable in a resin and Its application. ing qualities make it easy to apply to = j Easily workable: Requires minimum strut on the table. It should come in con­ compound curves. sanding. Little, if any, clogging of sand- tact with the table at all points. If you’re Available in 3 weights — 38" wide — paper. Curing time adjustable by the LIGHT % ΟΖ. CLOTH. For all wood a ir­ amount of catalyst. pretty good at wire bending, you might planes— cover 100%. Durable: Does not became brittle improve ground tracking a bit by bend­ MEOIUM 2 OZ. CLOTH. For increasing structural t QT. CAN (including catalyst) strength around fillets, nose, or interior of plane. ing in a little “ toe-in.” HEAVY 6 OZ. CLOTH. For joining wings or molding TAIL ASSEMBLY your own parts. K&B MEASURING/MIXING CUPS K&B Micro-Balloons FILLER — Twenty-four one ounce, unbreakable Construction is simple and pretty Mixed with K S B Resin is perfect lor plastic cups. Epoxy resin and most self-explanatory. I find it easier to cover fillets or filling in defects (or repair· model and craft cements w ill not ad­ mg later damage). Sands beautifully here. Accurately graduated, trom mil· and/or finish all the tail components to a smooth, strong hard finish, llleters to fluid ounces. prior to mounting on the fuselage. Here f OZ. CARTON ÍM 24 to Package again, it may be necessary to sand the aurora hobbycrafts surface o f the stab support a bit so that DIVISION OF AURORA PRODUCTS CORP. when installed, the stabilizer will be ab­ 12152 WOODRUFF AVENUE, DOWNEY, CALIFORNIA 90241 solutely parallel to the top wing. Need­ less to say, check vertical alignment down on the wing so thai the cabane ment, and the wing screws snugged when installing the fin. strut eyes line up with the wing mount­ down, solder the remaining angle brace COVERING AND FINISHING ing holes. Prop the tail up so that the connections. Before covering the fuselage, carve fuselage is approximately parallel to the With the structure still in position, or sand the engine cowl so that it transi­ table surface. place the bottom wing in its saddle. Care­ tions smoothly from the outline shown With the wing centered and lined up fully align the bottom wing so that it is in the Firewall section, to the circular with the tape marks, and the fuselage square with the top wing. This can be section at the cowl face piece. tail in line with the mark on the back done by standing a large triangle on edge I’m expert at finishing, so I always tape, adjust the four struts so that they so that the vertical side touches the look for the fastest, easiest way, and to line up with each of the holes. Bend or leading edge o f the top wing at the tip. my knowledge this means the pre-colored twist the eyes, if needed, so that they all Then measure the distance from the tri­ iron-on plastics, or possibly the new Per- seat flatly on the wing blocks. If they angle edge to the leading edge o f the bot­ magloss Coverite. This is where a biplane don’t, when you tighten the wing screws, tom wing, and compare with the same will cost ya! It takes a full sheet 26 x 72 the wing will warp. Cabane strut align­ dimension on the other wing tip and to cover the wings, and most o f a second ment can be accomplished by sliding adjust as needed. Compare, also, the dis­ sheet to finish the rest o f the plane. the unsoldered rear brace joint up or tance from each bottom wing tip to the Cut the wing sheet into eight panels down the strut. table surface. each 9 x 26. Cover the bottom tips, then When everything is in perfect align­ Make corrections for a good fit by the top tips, followed by the bottom

64 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER "HOT STUFF': GETS IT TOGETHER FAST AT YOUR HOBBY DEALERS NOW

DEALERS AND DISTRIBUTORS SATELLITE CITY, P.O. BOX 1935 CALL (213) 899-2301 ARLETA, CALIF. 91331

panels, then the top panels, and finally the ailerons. Cover the tail surfaces and the fuse­ D.C.DART $15.85 lage separately before assembly. The DIESEL ENGINES postpaid Fleet has no blending o f the empennage .036 cu.in. into the fuselage, which simplifies the covering and is one o f the reasons this Other D.C. diesels in stock model is easy to build. When covering the fuselage, in order Replicas Know the wind speed to get nice neat seams, I would suggest FREE FLIGHT that the turtle deck and bottom be cov­ HARDWARE For more DWYER ered first, followed by the tank cowling, NEW Winding information WIND METER then the cockpit cowling, and finally, Hooks. Etc. w rite : \ \ iv^ S 6 . 5 0 Postpaid tiie fuselage sides. There are some com­ For complete catalog and FREE Dept.M pound curves on the fuselage sides, so be Peanut Pilot send S1.00 to: HOBBY HIDEAWAY,Oelovon, 61734 careful and do a good job of shrinking .-JIM CROCKET REPLICAS wrinkles. J1442 N. Fruit Ave,, Fresno, Ca. 9 3 728y I personally don’t attempt to cover the engine cowl area. Instead, I prefer leak! color ad showing an instrument panel to seal the edges o f the covering material Use 1/4 X 3/8 spruce for servo rails, complete with switch panelsand radios, with epoxy, and finish the cowl with installed with adequate bracing at the and for a buck you get about 140 pages several coats o f wood tiller and dope. fuselage sides so that they cannot jar o f good aviation reading too. INTO THE HOMESTRETCH loose. Finally, no biplane should be without Cut the acetate windshield per the OPTIONAL SCALE DETAIL wing and tail wires. The simplest solu­ plan and install, using “ Hot S tuff,” plus Many o f the different models showed tion here is to go to any place that sells one o f the new trim tapes, such as Sig’s no headrest, so it is optional. The Fleet sewing materials. They’ll have silver elas­ Stripe Rite, or D J's Multi-Stripe. Model F-10-G was powered by an in­ tic thread. Cut the necessary pieces to These vintage bipes displayed their line engine, so a clean cowl is in scale. about two thirds of the length needed, registration numbers on the upper right But what really decorates this model is tie a small loop at each end and install and lower left wings, and usually verti­ the five cylinder radial. Williams Bros.’ when assembling the wings and N struts. cally on the fin. The wing numbers are 2 inch scale Wright j-5 cylinders fill the Use the thread also, for tail bracing. readily available in 3 inch decals at Hob­ bill just fine. After assembling the cyl­ When the thread gets dirty or stretched by Shops, Sporting Goods Stores, and inders from the plastic kits, cut o ff the out it takes only minutes and pennies Hardware Stores. bottom 1/2 inch, and carve or sand the to replace. After the wheels, engine and tank are base to fit the cowl. Fill the cylinder mounted, check the balance point to see with a balsa plug and epoxy to the cowl. Material list— approximately where the battery pack Remember, you are simulating a five 7 — 3/32 X 3 X 36 balsa and servos should be mounted. For ini­ cylinderengine with onecylinder missing 2 - I /4 X 4 X 36 tial lest flights, it is O.K. if the C.G. because o f the engine, so position them I - 1 /8 x 3 x 3 6 (balance point) is a little forward o f the in "star” form. 1 - 3/16 x3 x36 point shown on the plan, but even if you O f course, nothing looks more ridi­ 20 - 1/8 X 1/4 X 36 have to add a half pound o f lead in the culous than a beautiful scale-like model 12 - 1/8 X 1/8 X 36 nose, do not take o ff with the C.G. back flying by with two empty open cockpits 10-3/32x3/4x36 o f the point shown at least until after (Amen! wen). A 2 inch Williams Stan­ 2 - 1/4 X 1/2 X 36 the plane has been flight tested. dard Pilot, (leather helmet and goggles) 1 — 1 /4x1 X 36 The tank should be wrapped in foam will solve that problem. On the other 4 - 1 /1 6 X 1 /4 x3 6 and installed such that the tank’s center- hand, a Barbie doll head is in scale too, 1-1x4x12 line (half full) is level with, or slightly and she’s a whole lot prettier. 1 - 1/2 X 36 triangle below the center o f the carburetor. Use An instrument panel or two would 2 — 1/8 X 1/4 X 36 spruce foam and balsa scraps to secure the tank. look nice too. Use the I/2 inch instru­ 4 — 1/4 X 1/4 X 36 spruce There should be enough room below ments commercially available, or go 1 — 1/8 X 12 X 48 Siglite (poplar ply) the tank to stow the battery pack. Wrap down to the news stand and check the 1 - 1/16 X 6 X 12 ply it too, in rubber or plastic foam, plus latest issue of Flying. More often than I —1/8x6x12 ply a “ baggie,” in case the tank springs a not, Piper Aircraft runs a beautiful full 1 — 1/4 X 6 X 12 ply MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 65 oil and soybean oil. The problems with these oils come from the varnish residues that build up in the engine (marine spar METEOR 60 varnish is made from vegetable oils) and the fact that nitro-methane has a limit to • Ultimate in reliable operation which it will mix with bean oils. Don’t m Double ball bearings rule out bean oils. The new super-refined • Removable prop stud castors for motorcycles are much better than the old “ Baker A A A .” For instance, Bore .940 · Stroke .875 try Blendzall Green Label. It is very Displacement .6072 · wt 16.30 ozs. good, and fast. Full Stock of Parts Available Synthetics mix well with nitro and AVAllA&li A? Y O U » f AVO ÍITÍ ĎřAtíR do not have the varnish residues. But, MIDWESTΜΪΪΤ MODEL most synthetics do not have rust inhibi­ tors. This causes problems in storage o f engines. \ / \ / e*»w i»ihV “ - « · · UX)i II7 SM not (with silencer) Petroleums have not been used much I FI U. u \h MOt>Fi IHSTHIIH Ton s t n n \ 4 ; o t h e r s f o r m f.k :to > e a r s because they do not mix with alcohol at all. 1 — set, engine mount screws & nuts If you are one o f the enlightened indi­ viduals who use diesel engines for sport STEERING ARM Throttle, elevator & rudder push rods 2/fittings or racing, you can run some o f the better NEW DESIGN 2 — aileron threaded rods w / links petroleum oils for two stroke motor­ 2 — rolls, 26 x 72 covering material cycles. Kerosene, the basic ingredient o f 1 — sheet acetate, .0075—.015 thick diesel fuel, is a petroleum oil and there­ 1 pr. r 3 pr 3-1 /2 " wheels w / 5/32” fore is compatible. I am presently using collars a petroleum oil in my F.A.I. Team Racer 1 — 1 ” tail wheel with good results. The brand name is my 1 — roll 3 /4 ” masking tape business, because 1 need the competitive 5 min. Epoxy, Wilhold or Titebond edge. . . so there! 2 — 2 inch scale pilots GLUE ... $4,000 PER GALLON, 4 — 2 inch scale cylinders · reads the sign at the hobby shop. Must be hot stuff, you say. That’s exactly Control Line . . .Continued from page56 what it is. Hot Stuff is the most expen­ thanked them and walked out. I now ap­ sive glue ever made for model building. We have redesigned our extended preciate the problem modelers in the rest A t $8.00 for 30 grams it had better be steering arm and it is now fully o f the country have obtaining good qual­ good. It’s not just good, it ’s fantastic, compatible with our nose gear ity oils. terrific, and great! bracket. The nylon arm is molded Dave Trabert, o f Beverly, N.J., and Hot S tuff is a clear, non-toxic, one around the hard brass bushing to Greg Holland, of Yardley, PA., both part super-adhesive, with the viscosity give a life time tight fit. Now wrote and asked how to obtain NPG o f water and cured weight which is furnished with a 6-32 socket hd. motor oil. This is one o f the most popu­ immeasurable, except with a scientific cap screw for good retention. lar oils in California, as used by the gram scale. ‘home brew’ modelers. It is a pure syn­ Hot Stuff is a cyanoacrylate solution that cures in ten to twenty seconds, by Stock No. 09 — .79« thetic, formulated for lean mixtures. Price is $2.75 a quart from: NPG Lubri­ realigning its molecular structure, by its cants, P.O. Box 2037, Mission Viejo, own heat generation, to that o f the parts See your dealer or order direct CA 92675. being joined. It w ill adhere practically add .25« for post. & handling. Both Dave and Greg pointed out that all materials normally used in model for them, the Castrol Blue Synthetic oil construction, includingmetal and plastic. works very well with good power and Parts must fit absolutely tight, with no ROCKET CITY SPECIALTIES handling characteristics; exactly the op­ gaps, as Hot Stuff does not build a fillet 103 Wholesale Ave., N.E. posite from C. Johnson’s findings. Just o f its own. Because o f its viscosity, it will penetrate up to a 1/2 inch o f the Huntsville, Ala. 35811 proves that we must all do our own testing and then form an opinion. tightest joint. Instant bonding occurs Also mentioned is that Union Carbide with the application o f the smallest 1 — 1/4 X 12 dowel has two oil compounds especially for amount possible. Drops the size o f a pin 2 3/8 X 5/8 slotted gear mount model use other than the 1145 and 650 head are the order of the day. In fact, so b lo c k s that has been available for some time. little is used that it is difficult to con­ 6 — 1 /4 -2 0 thd. maple mount blocks The two additions to the Ucon line are vince yourself that it will really hold. 1 — 5/32 X 18 music wire MA-2270 and MA-731. Both of these But it does! I think I wasted most o f my 1 — 1/8 X 18 music wire oils are available from Union Carbide first bottle by over application. I am try­ 2 — 1 /8 X 36 welding rod sales offices, so check your local metro­ ing to find out how little can be applied 2 — 1 /16 X 36 music wire politan area for a dealer. and still maintain a bond. So far, I am I — 36” fine copper wire Before dropping the subject this still using too much! 6 — 1/4 - 20 X I nylon bolts month, some more information is in or­ This is the closest thing to bottled I — Goldberg tailwheel bracket der (oil engineers be kind to dumb ani­ time you will ever find. Your building 1 pr. — aileron bellcranks mals . . . namely me). There are basically will speed up so much you will never 1 pr. — long control horns 3 types of oil: petroleum, synthetic, and want to be w ithout it again. The only 1 pr. — short control horns vegetable/mineral. Before using a new oil disadvantage is that now you find out 8 - DuBro Gear Strap-on w/screws check the label to determine the type. how poorly you have been fitting parts. 4 — No. 2 X 3/8 s.m. screws Traditionally, the vegetable oils have Joints must fit perfectly or bonding will 1 - No. 4 x 1 /2 s.m. screw been used for model fuel, such as Castor not occur. Because of this quality, I

6 6 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER WIN!

With AMERICAN BALSA CORPORATION'S proven winners: Bill Chenault's 1/2A - A Mini Peart and the A-B and FAI Midi Pearl. In hand-launched gliders, we offer the U.S. Kid, Sweepette, Flash, Texas Bo Weevil, Polly, and the M ini Flash.

COMING SOON: Two great new hand-launched gliders: Grand National Champion Mark Valerius' Plane Jane, and Ray Harper's outstanding Maxflyer.

LOOK FOR: A l Vela's fabulous Mexi-Boy C and D class ship, and Al's new and successful FAI power La Mula. Both w ill be ready for distribution this summer.

This contest season, fly one o f these highly competitive designs.

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PHONE: (713)-668-3004 Dealer Inquiries Invited Cable: AMBALSA must still keep my Tite-Bond and epoxy revolve the shaft while pointing it down grey competition props seem to work near at hand to fill gaps when a part so the solution will flow into the case best, but they do break easily, so you doesn’t fit tight. (Save yo ur sawdust, bearing. might want to stay with nylon. I start Jed. According to Bob Hunter, you can Changing from Dacron to wire lines with three sizes o f Cox props. . . 5x3, fill up a "loose connection" with saw­ also brings an immediate performance 6x3, and 5-1/2x4. These props are too dust, and the Hot Stuff will bind it all boost. Half-A wire o f .008 to .012 is thick and must be thinned down by together, wen) hard to find in some areas. . . and also filing. Divide the blade into 1/2 inch Hot Stuff is available for $8.00, plus very fussy to take care of. If your local sections and draw lines on the rear face $.50 packing & postage U.S.A. Califor­ dealer doesn’t carry the stuff, you can of each blade. Stations are numbered nians add 6% tax. Satellite City, 9486 obtain it from Sig Mfg. Co., or from from the hub out to the tip. The chart Sandusky Ave., Árieta, CA. 91331. Ph. Clary Corp., 2931 South Main St., Unit shows two sets o f figures for blade thick­ (213) 899-2301. (Check with your deal­ E, Santa Ana, CA. 92707. Clary now ness. The first row o f figures represents er first, it is now distributed nationally.) carries the complete line o f Kirn-Kraft the minimum stage o f rework. You must Tell ’em you saw it in MODEL BUILD­ products, which it recently purchased. thin the prop to this set o f figures before ER. Among the Kirn Products is .008 solid a performance gain will be noted. The MOUSE RACING lines. Sig carries .012 braided. second row o f figures indicate the maxi­ Alan Lovins, a Junior from Denver, On my Half-FAI Mouse Racer plan mum amount of thinning that should be Colo., writes that a very simple lapping last month, there is an error in prop attempted. process performed on the crankcase of size. The prop size should be 5x3, not Additional gains will be achieved by his Cox engines increases performance. 6x3. raking the tips .050 to .090 of an inch. He uses a solution of Lava soap and Prop modifications are a source of Leading and trailing edges should be water. Pour the soap into the case and great performance increases. The Cox sharp. Also, the first 1/3 o f the blade

PROPELLER MODIFICATIONS FOR .049 MOUSE RACING Custom blade leading edge- .050" to .090"—► (Cox 5x3, 6x3, 5-1 /2x4 gray plastic Competition props)

Γ [ k____ Stock blade leading e d g e ______— ------Π L ______I I Station 1 2 3 4 5 6 2.5' Minimum rework .090 .075 .060 .050 .040 .025 Maximum rework .090 .063 .045 .035 .025 .015 Not to scale

MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 67 /Challenger H, 8GCCMCÍ to none l

-AND THE " ONLY" STARTER IN THE U.S.A. DESIGNED TOTALLY AS A MODEL ENGINE STARTER. IT'S NOT TAKEN FROM ANY OTHER PRODUCT, LIKE OTHERS ARE ...... I -STARTER GOOD ENOUGH TO BE REQUESTED BY THE U.S.A. INTERNATIONAL TEAM FOR THERE OWN R OFFICIAL USE. TO DATE IT HAS BEEN TO R/C, SCALE, FREE FLIGHT AND OTHER EVENTS, PLUS S NOW BEING USED BY THE A.M.A. SHOW TEAM .... -STARTER "GOOD" ENOUGH TO CARRY A FULL 5 YEAR T______WRITTEN GUARANTEE ON PARTS AND PERFORMANCE Do you really want anything less than the very tjD N IC-lR D N IE5 — INC. 2 South SYLVANIA AVE. PH I LA., PENNA. 191 Th· World» L«rg«tt M«nuf«ctur»r of Mod·! Engine Electric Starters.

quite complicated. Before I started fly­ “ Sears and Sawbuck.” It indicates, tem­ ing F.A.I. I just "went flying,” but team perature, relative hum idity, and baro­ Model Aeroplanes racing has so many variables, and per­ metric pressure. Record all three, several A Splendid Gift formance changes are so subtle, that I times each session, and always after a Bill Hannan's Peanut ver­ had to develop a specific system for particularly good flight. After several sion of ihc “Ideji" Nicu- port. Basswood and balsa practice. I wanted to develop reliability, months you will notice a pattern devel­ construction; «issue cov­ ered. Complete kit .. consistency, and top performance. My oping. Your best performance will occur white tyred simulated methods will obtain the same results for at definite times o f the day and under spoke wheels, plastic prop and thrust bearing, printwood. reed, rubber strip and detailed you in any event you fly, but you will specific weather conditions. When you Instruction Manual S4.44) ($5.00 securely packed and post paid». NJ buyers add S‘V sales tax have to change and learn some new arrive at a contest and check the weather, habits. you will know what to expect from your Peanut Plan Special . . l ive Peanut Size Kit Plan». WWI and Golden Age Biplanes. $1.50 post paid. Scratch Builder Super First requirement is a correct flying model, and how to adjust for the con­ Offer' Plan set and printwood for all five models. $5.00 post­ paid. NJ. buyers add 5T sales tax. circle marked according to the rules of ditions. the event. A box o f chalk and a tape Establish some standards or bases VINTAGE AERO 20-page Catalog $1.00 measure will accomplish this, if you can­ for comparison. Have a standard fuel not paint lines on someon’s parking mix that you can use for comparing fuel VINTAGE AERO lot. Secondly, you must have the entire experiments. Have test props that you 1 THE GLEN · TENAFLY. N. J. 07670 circle to yourself or performance changes use for no other purpose. I have a set will not be accurate due to the traffic of test props that I use for comparing congestion from other planes and pilots. motors on the bench. For instance, if a from the hub should be carved to a full You must fly alone also to be able to new motor will turn a particular test symmetrical section. The outer 2/3 of hear your motor accurately. prop a specific rpm, I know how fast it blade will remain flat on the rear face, The next and most important item will go in the air. And it does! You will with the high point on the top at about o f all, is a log book. In it you will record gain this knowledge only by keeping 30%. everything. . . I mean everything! No records. Propeller re-work is a slow and tedious one’s memory is good enough to remem­ Pilot technique is important for mean­ task, but very necessary, as no other ber everything that is done. My team ingful practice. Do not fly as you would variable o f speed and racing is so impor­ race log book goes back 5 years, and is a in a real race. A false reading will result. tant. valuable research book to me. The pilot must pivot in practice, not F.A.I. TR PLAN KIT Start by numbering your motors, and walk a circle. His arm must be out ri­ Would you like to build a model for coding all the parts inside, so that when gid. Not in to the chest or partially bent. the best event? The Kansas City team o f you do rework or part swapping, you can No whipping or restraining force should Dunkin and Wright will provide you with trace the origins and be aware of differ­ be applied. The model will fly slower by a molded fiberglass fuselage and canopy, ences. Make diagrams o f modifications about 3 miles per hour this way. Now a complete set o f model construction and list specifications. This will prevent you have an accurate simulation o f what plans, also plans and instructions for duplication of tests and experiments in happens when two other pilots are slow­ building the tank, shutoff mechanism, later years. ing you down. If you purposely slow and filler valves for pressure refueling . . . Record the props you use and speci­ down the model in practice, then you all o f this for only $20.00. I have seen fications for diameter, blade width, and will not slow down or lose anything in a the quality of their work and it is first thickness. If one works particularly well, race. Your race times will equal your class. Include an extra dollar to join the you will want to duplicate it. Fuel for­ practice times, and that is real consis­ F.A.I. Controline Association and sup­ mulas should be listed and variations in tency. port stunt, speed, and team race organi­ performance noted. I even work out sim­ How to time: the most accurate stop zation in the U.S.A. Write to: Jim Dun- ple charts and graphs to compare various watch you can afford is a must. I started kin, 10411 E. 39th Terr., Kansas City, mixes after testing, and to try to predict with a 60 second sweep, then switched MO. 64133. the outcome o f possible variations. to a 30 second sweep, and finally to a HOW TO PRACTICE FOR RACING Record the weather conditions and 10 second sweep. This will record accu­ Go flying, you say? No, unfortunate­ time of day while practicing. I use a rately 1/10 o f a second, and is easily ly it is not as easy as that. In fact, it is desk-top weather station purchased at readable at a glance. 68 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER *

No plane goes through more grueling workouts and trials than the ones that belong to the AM A Show Team. These modelers are hard-driving experts and their planes are the Superstars of the flying world. They get put through countless public shows, often per­ forming acrobatics and stunts that real aircraft couldn’t begin to do. And, of course, they have to be kept in prime condition and appearance. So, when we found out that the AMA team members individually chose SUPER MONOKOTE for their models, without any form of solicitation, we were a little flattered ... But, we weren’t surprised. Because, for years, we’ve been telling modelers that SUPER MONOKOTE was the truly professional finish and this just proves our point. There’s no other finish that goes on as fast and easy. It doesn’t even require any special skills. And, best yet, it puts a welcome end to sealing, doping, sanding and .polishing. Besides, it’s moisture-proof, fuel-proof, stain-proof and fade-proof. So, if you’d like to give a professional finish to your model, join the profession­ als of the AMA Show Team ... SUPER MONOKOTE YOUR next plane.

MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 69 UNCOMPLICATE WITH R G 'S " P i l P a k " and leave your more bulky box in the car. It's the total field box! Bottle molded of rugged high density polyethylene with brushed aluminum metal work. It fuels and defuels. It has a 1.33 gallon capacity and self-primes at any level. One side o f the PIT PAK houses a built-in transformer charger for two D sized nicads (nicads included in price), reversible pump, jacks for glow plug cord, and dip. The power pack side is removable for off-field charging. The other side is a tool caddy with ample area for plugs, props, prop wrench and other tools. $49.95

RED -B LU E - GREEN List color preference, if possible we will ship preferred color.

ST. JOSEPH, MICHIGAN 49085 Michigan residents add 4% sales tax PHONE: (6161-429-3528

goal. To really see how good you are, you must include the deceleration to PROCTOR HARDWARE landing and the first lap back to flying M 3 speed. The correct procedure is to time the • WORKING TURNBUCKLES model and note the reading, then im­ • RIGGING & CONTROL CABLE mediately start timing again, but now • CONTROL HORNS Q*\ shut o ff and pit the model half-way in • STRUT FITTINGS the timed section, and then finish timing. • SHOCK CORD The difference between the straight • COCKPIT TRIM timed run and the run with a pit stop • PULLEYS • INSTRUMENT HOUSINGS is your real pit stop time. Now, 10 to 15 I Foi «dditionai information. brochure end catalogue tend O.SOF seconds is your goal. PROCTOR ENTERPRISES INC. If you have a camera nut around, get P.O. BOX 9641 SAN OIEGO. CA. 92109 him to take pictures of your pit work. DEALER INQUIRIES INVITED You will be surprised to see where your ΜΓΟΟ. AT 6821 CONVOY CT. S a n O IC O O c a . hands and feet really are! Do two operations at the same time Time your model for the longest dis­ (unless you have only one hand). Set tance that your speed chart w ill read out. very important. With a diesel, if the first the prop position and open the shutoff Don’t be tempted to time a shorter per­ lap is exceptionally fast, 2 or 3 tenths or adjust the needle valve and fill the iod and then m ultiply the reading. The quicker than your established normal, tank. In a race, you do not have time to margin for error is too great. Time as the engine is over-compressed. It is then listen to the motor while turning the many full sections o f each flight as pos­ possible to shut o ff before the engine needle. Make an adjustment before start­ sible. You will quickly find out that the becomes overheated and seizes. ing the motor, based on experience flying speed varies from beginning to Time the last lap from engine o ff to gained through practice. You can lose end of the run. I start with the second the catch. The pilot should be able to 15 to 30 seconds waiting to hear an lap after takeoff, and time a section. I slow the model and land it for the pit engine adjustment. Time wasted is a then allow two laps for reading and clear­ man (without taking o ff his hand, Lar­ race lost. ing the watch, and then time again. Re­ ry!), in about the same amount of time Practice entire races from start to peat until the engine quits. as the first... 2-1/2 to 3-1/2 seconds finish. If you are flying properly with Examples o f typical results are: is about right. Landing should not take arm out, then the time you record is a. Slow start, good mid-range speed, very much time. If it does, then possibly what you can expect to duplicate at a slow finish. Reason ... the mixture is the model is too heavy. contest. too lean or too rich as the tank empties, Long landing times might be the fault When the flying session is over, prac­ or the engine is overheating. o f the pilot. Proper technique goes some­ tice or contest, take time to sit down b. Fast start, then steady slow down. thing like this: Rapid up and down ele­ and write out the results, good and bad Reason . . . over compressed or too hot vator flutter for 1/4 lap, while descend­ ... everything that you did. That is during warmup. ing to the ground. Apply down elevator valuable information that you will need c. Slow start, speed increasing stead­ immediately at touch down to keep some day. ily throughout the flight. Reason ... model on ground and to raise the tail See you all at the stadium parking too much prop for the model to unload high. This really slows things down fast; lot next weekend, where we can all have or the motor was too cold at start. like having brakes. Be careful not to tip a private practice circle! · These are some examples of what over. After the model slows down to a you can learn by consistent timing pro­ catchable speed, neutralize the elevator R em otely...... Continued from page 16 cedures. and roll on in to the pit man. Sounds we’d dearly love. Problem is getting it If there is a third member on your easy right? Shouldn’t take more than a from the Philadelphia area out to Los team, he can do some additional time couple hundred flights to master the Angeles. Anybody out there have con­ studies that are very helpful, and nearly technique! nections with a private or commercial impossible for the pit man to accom­ Time the pit stop. This sounds easy, pilot who might be able to give us a plish accurately. Time the first lap from but is usually done wrong. Most people hand? release. This will give a good indication time from the catch to the release and PEA POD PATTER of prop efficiency. How quickly the think 5 to 8 seconds is fantastic. It’s not. Would you believe that the third most prop unloads and comes up to speed is For perfection, 2 to 4 seconds is your popular full-size plan we have is for the 70 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER Pea Pod, that 36 inch long R/C sailboat, designed by Tom Protheroe and featured as a construction article in the April 1973 issue o f MB? As far as models R/C ELECTRIC FLIGHT SYSTEMS' •Patent Pending actually built, it could be Number One, since it is possible to build it from the article without using the full size plans. f r o m Not only that, school districts in the Pioneers In Silent Flight Saginaw, Michigan and Seattle, Washing­ ton areas received permission to repro­ AFI duce the plans and article material for ASTRO FLIGHT, INC. their student shop programs, and have 13377 Beach Avenue promoted the building of Pea Pods, en masse, by school kids! (Schools that are Venice, California 90291 interested may drop us a note for fur­ ther info).

Dave Katigiri, Seattle, Washington, * COMING SOON: ASTRO 020 R/C & F/F ELECTRIC MOTOR * has sent us photos o f Pea Pods. . . using less expensive vane control instead o f radio . . . built by his son Mike, and others in the Seattle area, which had the privilege o f sailing in the exotic pools o f the Pacific Science Center. PEAPOD POWER Other Pea Pod photos came from far- You'll pass by the fleet when your boat is powered by C ARR SAILS. With more o ff Japan, sent to us by good friend competition wins in more A.M .Y.A. classes than any other sailmaker, we know what an Ritsuri Honda, a fellow pattern judge important part of success sails are!!!! Act now and this M O D E L B U IL D E R Special will at the 1971 World Championships in allow you to suit up your PEAPOD for only $20.00, a saving of 1/3 from regular prices. Doylestown, Pa. Ritsuri is now President Write for our off-season savings In other classes and for a copy of the 1974 brochure and price listing!!! o f the Japan Model Yachting Society, and reports that ten Japanese compe­ Specify color: white, gold, red, dark blue, light blue or green. titors are preparing for the World Cham­ Specify main luff required: bolt-rope, dress hooks, double luff. pionships o f Radio Control Model Yachting, to be held in Gosport, Eng­ Give A M Y A boat number and choose numeral color: black, white, red. land, this summer, and sponsored by Make check or the International Model Yacht Racing money order Union. payable to: CARR SAILS HALF-A PYLON 7607 G R ESH A M ST., SP R IN G FIELD , Y A . 22151 Dave Katigiri also reports from Seattle on their 2nd generation 1/2A racers. landing, and the taxi back for refueling, flying during the up and coming winter Deletion o f the RCM conformance re­ Jim found his bipe absolutely covered months. Winter flying would not be a quirement allows some interesting de­ with ice. Fuselage, wings, tail, every­ new experience for us, but the thought signs. Dave says they tend to be “ things,” thing! The plane had gained between 4 o f a soaring contest in mid-February but fast! and 5 lbs. and had an eighth inch o f ice. seemed to arouse everyone’s interest. Bob M ikko’s fiberglass bodied model “ He refueled, scraped o ff the ice, and We wondered just how many R/C soar­ carries a heat sink on the head to save flew again . . . this time in a light rain. ing nuts we could attract to a contest plugs, uses hi-nitro fuel . . . pen bladder The same results. The third flight began with the thoughts o f deep snow, icy tank. Straightaway speeds are estimated just as it started to rain fairly hard. More winds, sub-zero temperatures, not to at 75 mph, based on race course speeds landings and then, while coming around mention a scarcity o f lift. of up to 50 mph. for a last approach, the engine quit. Jim “ Fourteen soaring buffs accepted the FLY . . .WEATHER OR NOT! says he never knew a biplane could land challenge of the first Sno Fly (1971), We have two examples to show that that hot! The engine had quit because despite the four degrees below zero California style weather isn’t absolutely the throttle had iced up, and she’d temperature. Since then, Sno Fly has a must in order to fly models... if leaned out. steadily increased in size, with sixty-five you’re nuts enough! “ Warren Sanders drove up during eager pilots turning out for the 1975 In the DCRC Newsletter for February, Jim’s last flight and will verify Jim’s ic­ event from five states (two from Texas) edited by Glenn Scillian, Mike Winter ing. Warren said that I-95 had been closed and Canada. This response gives reason (very appropriate) reported the follow­ because of the severe icing on the road to believe that the Sno Fly is becoming ing incident: and a rash o f accidents. They sat in one o f the most prestigious soaring "I heard that Jim Watson had gone Warren’s car until the radio announced events to attend in the country, save the to Columbia to fly Saturday, Jan. 18. the all clear on the highway. Jim is now Soaring Nats and the L.S.F. Tournament. He arrived just as it started to sprinkle. looking for de-icing equipment and a “ Competition at the Sno Fly has al­ Not wanting to waste the gas for the carburetor heat control for his models!" ways been as tough as any soaring con­ trip, he quickly got his Eagle 60 powered As if that isn’t bad enough, the Great­ test during the year, and this time was Acrostar bipe out, fueled up, and air­ er Detroit Soaring and Hiking Society no exception. Three national grand borne. After 5 minutes o f maneuvers, purposely plans an R/C soaring meet in champions were present. . . John Neil- and since it now was sleeting, he decided the snow! O f course, with a club name son ’71, Jeff Mrlik 73, and Otto to come in closer and start shooting like that, who would be surprised at Hiethecker 74 . . . plus a heap of tal­ landings. The first tough-and-go was pret­ anything they might do! Charles “ Bud” ented flyers from around the midwest. ty routine, but then he noticed he was Pell, reports on the GDSHS 1975 Sno Through the two rounds o f seven minute having to make each approach progres­ Fly: duration and one round of three minute sively steeper to keep from stalling, "In the fall o f 1970, a few members precision, it was a toss-up as to who followed by progressively longer runs to o f the Greater Detroit Soaring and Hik­ would come out on top. ‘Tough to beat’ get her o ff the ground. With his final ing Society were discussing the evils o f Jeff M rlik took top honors in the open

MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 71 CARL GOLDBERG

V ON

U.S. PATENT 3,822,138

SIMPLE TO• ~ USE,uuL, NOnu SCREWSouncno ORun HARDWAREι ι η π η REQUIRED! ast, a spinner that works like you've always wanted! A ^ RE RED VA" - .90 n°6S 0n like SNAP-SNAP-SNAP! Comes off 1-2-3! tighten, no extra hardware to buy. Built to 5 WHITE 5 1%" — 1.00 e e ectric starters. Over 2 years in development. Study CG <.eatUres sřlown here, then ask your dealer for the COLORS BLACK S I Z E S 2 - ’25 . naP-On Spinner — the beautiful one that does the YELLOW 2'A" - 1.50 job like no spinner ever did before! BLUE 2y2" - 1.75 'MULTI-STRIPE •YELLOW »BLACK •BLUE •WHITE »GOLD •RED 1/16" Wide, with a* mnriei o?* k1'II T L E ' the famous flyer, Modelers by the thousands now use 36 Feet Long - ST.98 YÍ i modeJ of tbe Gee Bee R l, one of the ships he raced änd won with back before w.w. Multi-Stripe to beautify their models. Tr,Z, r ^ ! L was buil* bV Steve Crowe and And that includes the best, such as Terry I°[JVc 9?®,a '1d ' * a highly successful R/C ship. Prather. Walt Moucha. Don Dewey, etc. Inm o.ii»0 hi.s· to construct, weighs 5.3 lbs. complete, and uses black DJ Multi-Stripe tabe Main reason is the patented Multi-Stripe around the red trim lines.'------— adhesive, which cures in sunlight. If YOU 3/32" Wide, want the best, choose Multi-Stripe! See your dealer! 36 Feet Long $ 2.69 WIDE MULTI-STRIPE 6 " X 36", only $3.95 And for wide designs, use new Wide Multi-Stripe. The package also contains patterns for 2 sizes of numerals and AM A letters. Plus various arrows and other special shapes to decorate your model! 1/4" Wide, 36 Feet Long - $ 3 .6 9 I

RANGER 42 IS BACK/ F°r best service, see your dealer for items you want, I t f * • 4” AND 6” WIDE ft not available, write direct; add SOd per item The popular Ranger 42 NYLON REINFORCING TAPE (Si outside U.S.J. Minimum order Si. is now back in stock I Extremely tough when I------I applied with epoxy Ask your dealer for it. I Carl Goldberg Models Inc. 6" wide X 5 It $1.00 *6 4736 W. Chicago Ave., Chicago, IL 60651 4“ wide * 5 it 754 N4 2'A" wide X 5 ft 504 n 2 I am sending 25c (or 8 pg illustrated Kit PRC1 $23.95 3/4" wide X 5 1t 264 n j Catalog w ith Basic Explanation o l R/C Equipment and Radio Control Definitions Name______M A N U P A C TU B E R S -a " ° u' acceisor.e« are available al excellent O E M bulk price« A ll ITEMS AVAILABLE IN CANADA Address . ^ R L GOLDBERG MODELS INC. C ity____ W j:u. WEST CHICAGO AVE.· CHICAGO, ILLINOIS I.Oiol Stale.Zip -

WHEN CONTACTING ADVERTISERS, TELL 'EM MODEL BUILDER SENT YOU! 72 MODEL BUILDER class and overall, nosing oul Bob Robin­ son second, and Otto Hiethecker, third. K & W ENTERPRISES PROUDLY PRESENTS Ted Strohm won the standard class, with THE Ray Hayes and Dave Yergins taking sec­ ond and third. Young Chris Corven cap­ STOP ·Α· PROP tured the Junior title, while Jim Steele ENGINE BRAKE took second. FEATURES: • VERY LIGHT WEIGHT - Less than four grams (FAI-A-B) “ The Sno Fly has become more than • CAN NOT DAMAGE ENGINE e i a contest. It has become a gathering o f • CAN BE USED WITH Vi A SQUEEZE-OFF TIMERS the clan, a mid-winter meeting o f warm • RUGGED CONSTRUCTION weather friends who disappeared last AVAILABLE IN 3 SIZES* October; a seminar on everything from PITCH GAUGE . . S19.95 VSA (T .D .)...... $2.75 the best airfoils to the proper foul wea­ A-B (F A I)...... $3.25 ther wearing apparel. But most o f all, it B-C...... $3.75 has become a day of flying R/C sail­ 3 Of FAI Size.... $8.50 Check or Money Order 1 Of Each Size... $8.50 Dealer Inquiries Invited planes with lots of really great people. Postage.,S1.50 That’s what the Sno Fly is all about. * Fits most competition engines Pa. residents add 6% sales tax “ Next February when you become K & W ENTERPRISES P.0. BOX 18895 PHILADELPHIA, PA. 19119 blurry-eyed at the building table, grab any old sailplane and your snowmobile “ flig h t” includes takeoff and landing suit and head for southern Michigan, maneuvers) it should not be considered S aiting Yachts For because Sno Fly 76 will be. It will be as having been jettisoned. After all, the because we all enjoy this great geto- purpose o f the rule is to prohibit pur­ Radio C ontrol gether. We invite you and your friends poseful dumping o f parts that could in to the hottest mid-winter contest in the some way improve the contestant’s country.” score. Certainly there is no advantage TAHOE 600 ABOUT THOSE CLASSES to losing a battery hatch, wheel, canopy, . . . Standard and Open R/C gliders, half an elevator, the rudder, the prop that is. Le Gray has always purposely nut, spinner, prop, thrust washer, etc. avoided getting into controversial sub­ Why add insult to injury by canceling a jects and/or editorializing on same. Even contestant’s flight if such an accident in this m onth’s article on the “ Great happens? AMVA 36/600 CLASS Standard Class Controversy," Le has Before anyone gets too excited, the remained amazingly neutral, trying to LENGTH 36 in jettisoning statement applies only to BEAM 9 W in point out certain facts that seem to be FAI competitions and not to domestic SAIL AREA 600 sq in overlooked . . . or avoided . . . by both contests in which the FAI maneuvers sides of the argument. are being flown. And as o f now, we have $ 3 5 .9 5 However, he did manage to let his no anti-jettisoning rule of our own ... hair down (he finally let it grow out, in R/C events. However, we feel the FAI you know . . . last fling and all that) in rule should be clarified. If jettisoning is VALKYRIE the closing paragraph, when he asked truly meant, then the rule should specify AM VA SO/80O CLASS why it was necessary to have any divi­ that involuntary shedding o f parts will LENGTH 50 in sion into classes at all. And if we may BEAM I I \ In ff 7 A Q C not cancel a flig h t. . . it might shorten SAIL AREA 800 sq In ^ , H , 7 J remove our R/C Contest Board Chair­ the flight, but so does running out of Complete kits include molded plastic man’s hat for a moment, we most heart­ fuel . .. and the only penalty here is loss hull and components, all rigging.finished ily agree. If anything, divide the flying of further points . . . penalty enough. sails and semi-finished wooden parts. skills, as Pattern finally figured out was THINGS TO DO best, after more than 30 years o f R/C Don’t forget that World War II Scram­ TAHOE SAIL SYSTEM $24.95 maneuver competition. It can be done. ble at Morgan Hill, California, May 16 Take5 identical Cumuli (Cumuluses?) and 17, 1975. Co-Sponsored by the VALKYRIE SAIL SYSTEM $33.95 and put them in the hands of 5 different Pioneer R/C Club of Sunnyvale and flyers at a contest, and they’ll end up as MODEL BUILDER magazine, it is to be far apart in the final tally as Phineas W & U t Æ l ·ts the West Coast Version o f that very pop­ 11715 Adenmoor Ave. Downey, Ca. 90241 Pinkham’s front teeth. ular annual event that takes place at Another very level head has suggested Lakehurst Naval Air Station, New Jersey. Calif residents add 6 ' rax DEALERS W ELCOM E that we have as many classes as a reason­ There are trophies to fifth place for able number o f people desire! It's the “ Museum” Scale and Sport Scale, plus ber of this year. same idea as the choice o f tasks. The merchandise awards. Contact Eric Clapp, The site choice was made by the hosting organization determines which (408) 997-2298 and come see it even if finalists themselves, in conjunction with classes and tasks will be flown . . . After you don’t plan to fly. You’ll probably the National Society o f R/C Aerobatics. all, they’re the ones that gotta come up come away planning to bukd for next These finalists also voted in the major­ with the hardware! year! ity to deny the right of qualified fliers, Hat Back On . . . * * * who did not show at Hutchinson, to HMMMM... Rough River State Resort Park, Ken­ compete in Kentucky. In our opinion, In looking over the FAI R/C pattern tucky, scene o f the annual “ Mint Julep” this is a very disturbing display o f poor rules, we find the statement: “ When meet to be held this year on May 17 and sportsmanship. In two specific cases jettisoning occurs the flight is cancelled.” 18, will also be the site, on June 28 and that we know of, the individuals were This brings up several interesting points. 29 for the blown-out Master’s Tourna­ unable to make the wasted trip to Hutch­ Webster’s dictionary defines jettison­ ment. This tournament serves as the FAI inson because o f very real, personal cir- ing as a voluntary act, such as purposeful R/C Pattern Team selection finals, and stances. One o f the individuals was a dumping of cargo when a ship is in trou­ will determine who is to represent the member o f the 1973 U.S. FAI Team! ble at sea. Thus, if a part accidently United States for the World Champion­ We’re sure that any of those who had comes o ff o f a model in flight (and ships in Berne, Switzerland, in Septem- voted for denial would feel the same MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 73 current Technician Class License was almost exclusively given through the mail by another licensed amateur, it is safe to say that all those flyers (with a Technician Class License), using six meters at present, will sometime in the future be out of a license. That is, if the FCC makes this docket an official regulation later thisyear. All current holders of the Technician Class License would then be required to travel to a regional FCC office and take both a w rit­ ten test (covering intermediate level VHF theory) plus a five word per minute code test. Those failing to pass such a test (proctored by the FCC) would lose their license. What does all this mean? Well, the deter­ mined R/C flyer (with a Technician Class License) will probably take the trouble to learn the new VHF theory, brush up on his code and pass the test. Unfortunately a good major­ ity won't bother. Let’s face it, some individuals may have to travel several hundred miles to an examining point and may possibly lose a day's pay in the process. A first time failure might even prompt a second trip. Then too, all the while you are learning the new theory H RE CHASSIS K I T ...... $144.95 and practicing coce, your fellow R/C flyers The Hallum Racing Enterprises chassis k it is now available and on 27 and 72M HZ will be busy building and includes: Chassis plate, engine mount, front end assembly, rear flying. With that possibility in mind, many blocks and bearings, Kydex for bumper/radio m ounts/roll bar, fellows will simply pay the $50 to $60 fee and have their equipment converted from six battery and receiver hangers, steering override, throttle over­ meters to the 72M HZ band of frequencies. ride, flywheel and dutch assembly (12 teeth), integral gear and The result? You guessed it. A real big crowd brake (56 teeth), brake band and liners, front and rear wheels on 72 and possibly 27 as well. This is why I and tires, 1/4 inch diameter rear axle, body mounts, wing tubes say that adoption of this new rule has an and mounts, and aerodynamic wing assembly. A ll related hard­ indirect effect on every R/C flyer in the country. ware (aircraft quality) included. Front and rear ends fully ad­ What can you do about it? Well the first justable. AH parts available separately. BODY NOT INCLUDED. thing is to write the FCC and reference the i m r Engine mount available separately ($9.95). Fits Veco, McCoy, Docket #20282. The important message to get across is that the R/C flyers, using the n n C and Taipan engines. six meter amateur band, want their Technician y n C Winner of Expert Road Race, 1975 Winter Nationals, San Class License privileges renewable at the regu­ ■ Jose, California. lar five year interval as in the past. Secondly, that the requirement for retesting be waived. HRE Inc., P.O. Box 4658, Irvine, California 92664 Remember it was bad enough to learn the theory and code the first time around, why personal hurt experienced by these fliers Because o f its dated importance, we're have to do it all over again because of a rule change. (And after all, we only want the if their contemporaries had treated them squeezing it into this month's issue, and license for R/C operation, not voice commun­ in the same manner. Even if some of for that reason, had to go to a smaller ication. wen) Direct your comments to: the denied fliers had purposely avoided type size. We feel that it is important Federal Communications Commission, 1919 Hutchinson, because they thought it was enough, for all R/Cers to respond to the M Street N.W., Washington D.C. 20554, Atten­ tion: Mr. Vincent J. Mullins, Secretary. Com­ a bummer, it was done so at their risk plea, wen, W6MGK). ments will only be accepted up ’till June 16, that the contest might not come off. At the present time the FCC is soliciting 1975. As usual, in dealing with a government As for the 1975 Tournament, we’re comments on a proposed rule change (refer­ agency, you must provide an original plus wondering how much industry support ence Docket #20282) regarding some far reach­ fourteen copies to the FCC Secretary. ing (major) changes to the Amateur Radio While you are at it I would also address a for officials accommodations and travel Service. This docket was released by the FCC copy of your comments to the: American will be available in light o f the current on December 16, 1974. The February 1975 Radio Relay League, 225 Main Street, New­ magazine caper. Many model industry issue of QST Magazine (official publication of ington, Conn. 06111, Attention: Mr. Richard leaders are turned off by the situation, the American Radio Relay League) contains L. Baldwin, W 1RU, General Manager. The a complete reprint of the docket beginning on ARRL (counterpart of the AMA in the "H A M " and this could mean that donations from page 76. world) has just circulated a large, comprehen­ them for an AMA oriented function Although this docket primarily concerns sive questionaire to all of its members. Based would be rather slim. We suggest that "HAM S," it also carries with it implications on the results of this survey, it will approach the NSRCA appeal directly to the man­ which could directly affect our present R/C the FCC with specific comments which re­ flyers utilizing the six meter amateur band. flect the general feelings of the "HAM S.” ufacturers for support. After all, it may In an indirect fashion all R/C flyers could Unfortunately, our problems as "HAM” R/C be well for all such organizations to get ultimately be affected. flyers will be lost in the crowd unless our used to the idea o f taking care o f them­ Apparently over the past couple of years, comments are made known. selves . . . individuals as well as manufacturers of radio­ It would also be advisable to send an addi­ * * * telephone equipment have encouraged the tional copy of your comments to AM A Head­ FCC to liberalize certain portions of the Ama­ quarters addressed to the attention of the Fre­ The Second Annual )im Kirkland teur Radio Service Regulations to increase quency Committee. Hopefully this committee Memorial Pattern Competition will take participation and prompt greater usage of the will get involved with this situation and give place at Fort Walton Beach, Florida, on amateur radio frequency allocations. Stated us a helping hand. another way, citizenband operators would Please note that these proposed changes May 31 and )une 1. Sponsored by the like to get authorization to use some of the will not affect a General Class or higher level Eglin Aero Modellers, there will be lesser populated amateur frequencies. "HAM" who has previously obtained his li­ trophies to 5th place in each of the 5 At first glance it would appear that we cense by passing a test under the direct super­ events (Class A, B, DN, DE, and Sport don't have a problem. In fact as I will mention vision of the FCC (not through the mail). I later, there may be some benefits to the R/C doubt if very many R/C flyer "HAM S" fall Scale) and a free banquet. Contact Dick flyer. Unfortunately the FCC took the oppor­ into this category. McGraw, CD, 43 Wayne Circle, Ft. Wal­ tunity to include an entire list of proposed There is one possible benefit from this ton Beach, Fla. 32548. (904) 244-5069. rule changes which they feel will improve proposed restructuring of the Amateur Service. A new type of license is being considered, TO ALL R/Cers overall amateur operations. One of these changes states that the existing Technician called, "Communicator." To obtain this li­ (The following letter is addressed to Class Amateur Radio License, will no longer cense one would only have to pass a basic all R/C modelers and manufacturers, and be renewable, unless the examination was VHF theory test without the need for Morse was written by Bob A berle, W2QPF. originally taken at an FCC office. Since the code. Frequency privileges would be permitted 74 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER above 144MHZ (the details of this are not clear at this time). Although six meter opera­ I tion would not be permitted, it is possible - ^ that R/C flying might be permitted on either 144MHZ (two meter band) or the 220MHZ band. This would certainly give us the much needed relief that our AMA Frequency Com­ mittee has been looking for. Passing a simple NEW VHF theory test would be well worth it. Something to think about! ■ Γ At any rate please write. If you don't take a/u*MÍnu**t) 1 an interest now, don't complain about what you lost in a couple of years. ·

R/C Auto .... Continued from page 51 ΐίκ ίερ Α d ie d . the main. He did a lot o f racing and l)J overcame many problems to earn his win. ·· As expected, Kyes and Campbell jumped out at the start of the Expert main. I got through some traffic after 50" SOLING-M Turn One, and was third or fourth. There was lots of racing and not too many tangles during the first part of the race. At 17 laps, everybody started pitting. I d e x a n ® planned to stop at lap 21 and 41 for 4 ^ ? 0 Γ the 60 lap race, so I went into the lead. A t lap 21 I had a clear field ahead and 6cvteC uw ief continued, since there was no indication 70" SANTA BARBARA of low fuel. I got in and out at lap 22, ahead o f the leaders. Later I learned Kyes had broken a front steering cross- 7Td4e*Mi6ítf, fan t / c arm bolt after his first pit stop. Camp­ bell seemed to be having problems with his car and I had to drive around him at the last corner as he spun out. Bob Donkels wasn't so fortunate, be­ - e y 210 EAST ORTEGA ST. cause he had a strong third place near SANTA BARBARA, CA 93101 (M tO l kPPOCf. iC tO U M , £ · - the end, but went out when he hit Campbell during another spin out. On lap 41, 1 heard the announcement, ing. Everybody really appreciated the to start); and 10% nitro. No other air “ 9 laps to go,” so I came in and fueled fireplace and all congregated in that area bleeds to the engine would be allowed, and got back out. Now I had a 2 lap to guzzle and munch. A lot o f the excit­ such as free porting, where the piston lead, so I just motored around. Campbell ing, outstanding, and funny things were opens the exhaust port, or other ports, did a series o f cart wheels next to me rehashed. when the piston is near TDC. It may be and went over the wall on the back One group got into a discussion con­ required to tech inspect the top finishers straight. It turned out his battery had cerning how much time and money it in the final race, but this would guaran­ been dragging on the ground, causing takes to be competitive. Time seems to tee the honest guys that they weren’t all sorts o f problems. Bill Jianas was be more important than money. If a guy being cheated (I’ll volunteer for the post behind me so I told him to pass. Jianas gets the best equipment today, and is race tech inspection, or a committee can said, "No way.” I couldn’t figure that good, he’ll still be out o f it next year. be appointed). Fuel for the Nats heats out ’cause I know how Bill drives. . . but He has to spend all kinds o f time to do and finals would be provided. In local then I found out he had second place those little things to get the car to han­ races, fuel (K&B 1000, Eagle 1200 or sewed up and was also motoring to the dle the increased power that always equivalent) could be provided with a finish! The race had been shortened to seems to keep coming. That’s really the slightly increased entry fee. 50 laps because o f darkness, but I was only reason that car designs change. Well, that’s it for now. See you in two unaware o f the change. It’s just as well, I still feel that a limited carburetor months. I’m taking the big step in a because I may have tried for one pit stop and fuel class is the way to provide a couple o f weeks and I won’t have time at 25 laps and been sorry. more uniform class for competitors who to write an article (or so my future wife In the road cars, the one technical have a limited amount of TIME as well says).______· thing of interest was that about 4 or 5 money (TOOT-TOOT, that’s my horn cars had “ rocker” power pods. Jack Gar­ blowing again). If a fellow builds a lim­ Sailing...... Continued from page 39 cia had a "rocker" car about 3 years ited class car today, it will still be com­ ping it onto the YANKEE to see just ago. The general idea is to let the rear petitive next year. Changes to the chas­ what effect it will have on pointing end, and engine, rock, so that you get sis and engine will not have to be made ability. I’ll have a performance report better rear traction . . . But then the continually, which costs lots o f time at a later date, but can say now that I’ve problem becomes, how to get front trac­ and money. Then the competitor will held the fitting in my hand and that if it tion. The cars which had a rocker rear not have to be super-active all the time works as nicely as it is constructed, it end, that I know of, belonged to Steve to be in the race. We’ll start seeing again will rate the 5 star treatment in our Betts, Al Olseen and myself. There are some o f those faces we remember who book. You can obtain information on still little problems to work out to get had to drop out of competition because the item from J. G. Products, 8030 them to work right. they didn’t have the time to be away Fordham Road, Los Angeles, CA. 90045. After the races, a bunch o f the parti­ from their families, work, etc. for weeks While we are passing out kudos, we’d cipants: drivers, officials, helpers, and to get ready for a big race. like to send one out to Ron Menet, observers, stopped o ff at a local pizza So the proposed class, rules might editor of the MASTHEAD, a monthly house to conclude the weekend o f rac­ be: limited carburetor bore (.156 in. dia. newsletter o f the El Dorado Yacht Club. MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 75 “ The first event was that ot a poll being taken to determine interest in a \ A FIN E LINE permanent headquarters and nationals site at Hutchinson, Kansas. I was not OF PRECISION asked to participate in the poll because I don’t subscribe to the Competition PRODUCTS FOR News. I am, however, a sometime com­ RADIO CONTROL petitor and president o f my club, The West Jersey Radio Flyers. I am also an active Contest Director. Since you didn’t ask me, I vote ‘no’ until all the members • n of the A.M.A. have been presented with all the facts regarding the proposed pur­ chase. “ The second event was the rather limited (to say the least) forum provided academy members to ask questions of LéSPECM LT/ES the A.M.A. at the special District II meeting at the WRAMS show on Mar. 2. // CUSTOM MODEL “ Just so you don’t think I’m venting BOATING HARDWARE my spleen on you and the Executive PO Box 588 Saratoga Ca 95070 Council exclusively, I’ll pass a salutory send for catalog - 500 dealer inquires invited 21 Bronx cheer salute at those District II pylon flyers who, at the conclusion of their particular bit of business, rudely got up and left w ithout so much as a wave bye-bye. (We concur with this heartily. It was an outstanding display ► o f bad manners; the worst we have seen in all our years o f modeling, wen) “ Back to the business at hand. 4 h V " I learned from our new District II V.P., John Byrne, at Friday night’s cock­ tail party that the Executive Council planned to publish an A.M.A. magazine. Correction: Not only planned, but had gone right ahead to do it, apparently His two or three page effort every Avenue, Brookfield, III. 60513 will get hiring an editor, one William Winter, month is keeping us really up to date on the Quarterly Newsletter, shoulder who I recall as being at the head o f happenings in the Los Angeles area. Hav­ patch, rules and regulations, and most o f several now defunct publications. ing run a similar effort during ’69-71, I all, a direct connection with the fastest "To refresh your memory, sir, I am can only sympathize with Ron, as it growing head-to-head competition sport the one who stood up and protested this often turns into a one man operation. in the country. action at the WRAMS show. Nevertheless, it seems to reflect the seri­ In upcoming months we will address “ It is now several days later. I’ve ousness with which the El Dorado Club ourselves to the whole problem o f sail thought it over carefully, and discussed is taking the challenges o f new member­ control units. We’ll take a look at that it with about sixty A.M.A. members so ship drives and so forth. If your club is sailmakers dream . . . the spinnaker. And far. If anything, I now protest even loud­ lagging, or even if it has new members we’ll interview the 1975 AMYA presi­ er. to burn, there is nothing like a club dent, Bob Harris, to find out what the “ First, and possibly most important, newsletter to keep all hands up on view looks like from the top o f the heap. a government that sets its own editorial what’s happening. Ron’s effort is pro­ Keep those cards and letters coming, in policy gets the ability to tell those who fessional, and will benefit his fellow care of MODEL BUILDER, or direct to are governed pretty much what it wants, club members greatly, he’s at: 12246 7607 Gresham St., Springfield, VA. when it wants, w ithout all that fuss and Yearling Place, Cerritos, CA. 90701. 22151. · bother of presenting dissenting opinions, Another new effort is being handled unless it wants to. The amount of dis­ by Bob and Sue Crysler, Box 32, Delray Workbench . .. Continued from page 4 senting opinions presented is probably Beach, Florida 33444. Their WATER- stands? Aren’t most o f them available inversely proportional to the amount LINES is coming out on a monthly basis only to members? received. and concerns itself with the activities of AMA says that, “ MA is budgeted for "Second, the competitive atmosphere the Florida skippers who we northerners 80 pages with minimal advertising, but is rather cloudy. all envy. A new sailing club, called the if advertising support is greater, AMA “ There are four existing model air­ Gold Coast R/C Model Mariners, has members w ill benefit by having an im­ craft publications. Three more, not in­ sprouted under their care and feeding proved magazine and staving o ff a dues cluding yours, are planned. Two model and is applying to AMYA for official increase.” Does this mean that if the aircraft publications have recently failed. sanction. WATERLINES is not only pre­ advertising support is not greater than I don’t think the modeling public is senting news and schedules, but has tak­ minumum, that the dues will have to go clamoring for the three new publications, en a good deal o f its pages to discuss the up to support the magazine? let alone yours. technical aspects o f the sport. This is And now the open letter to John “ Let’s say though, that in the next something that will certainly attract the Worth from Dave Meier. few months, we are treated to eight newer skippers just getting into yachting. “ Dear Mr. Worth, model aircraft publications. Here is what Remember to get your dues into “ It is seldom that I write letters o f I see happening: AMYA. Five dollars sent to the Secre­ this nature. It is also seldom that events 1. Subscription sales will fall off for tary, Bud Salika at 3917 Sunnyside rile me up enough to do so. the existing magazines. Sales for the new

76 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER ones will not meet forecasts, reason be­ ing that modelers will pick and choose those issues that interest them rather Greatest Book of than subscribe to all. Blessed are those FULL-SIZE RUBBER FLYING magazines that consistently appeal to SCALE PLANS, plus the largest audience, for they shall be known as survivors to which advertisers building, trimming, and SCALE MODELS and contributors will flock. If the flying instructions ever A.M.A.’s magazine is not one of the published! OF WWII chosen, a lot o f money will have been wasted, not to mention the loss o f poten­ tial new members through lack o f ex­ Twelve half-inch scale O o posure. rubber powered flying “ What about advertisers and contri­ models by some of the 12 FULL SIZE PLANS butors; Let’s take advertisers first. If I were an advertiser, would I: world's best modelers, •GRUMMAN F4F WILDCAT •GRUMMAN W MILL CAT a. Put smaller ads in more magazines? including Doug Mc- • VOUOMT M U CORSAIR b. Put larger ads in fewer magazines Hard, Clarence Mather, • SUREHAWKER AMARINE HURRICANE SF1TEIAE I and hope I picked winners. Bill Hannan, Bill War­ • EOCKE MULE TA 183 c. Put smaller ads in few magazines, • •ELL »JB AIRACCRRA • CURT*» F4QC pulling in my norns, as it were? ner, Bob Peck and • F4TO TMUNOfRROLT d. Put the same ads that I now buy • F4W MUST AMO others. • COVERIMG ANO TRIMMI» in all the magazines? • MAKING IT FLV “Answer: I don’t know, ‘a’ could hurt me because my competition might Compiled and pro­ FEATURE ARTICLES ON choose V and pick the winners, ’b ’ A L L 1/24 S C A L E duced by I.E. Coleman, ivr»r) BUILDING, FINISHING, AND could hurt me if I didn’t pick right or if edited and published FLIGHT ADJUSTMENTS. that m onth’s issue o f ‘RC Flying Model News’ didn’t sell, ‘c’ has the same pitfalls by Model Builder Ma­ AVAILABLE NOW - $ 7 ” as V and ‘a’ except my advertising bud­ gazine. get would be reduced, ‘d ’ would raise SEE YOUR HOBBY DEALER, OR ORDER my advertising cost and I ’d have to DIRECT. ADD $1.25 FOR FIRST CLASS. raise prices in a period that has seen CALIFORNIA RESIDENTS ADD 6% SALES TAX. more than enough price increases. FLYING " I seriously doubt that you can pub­ Box 4336, lish an .eighty page (your figure) com­ SCALE MODELS Santa Ana, Ca. 92702 petitive (for readership) magazine w ith­ out advertising revenue. “ The other magazines are privately enthusiastic about the new magazine. offer, as I understand it, was not even financed by people who have been in­ Sir, it is presumptuous to say the least, discussed at the February council meet­ formed o f the risks and have chosen to to use the opinion of a one minute mem­ ing. take them. It seems that the council has ber as a sign that you did the right thing? “ In view o f the council’s apparent decided to put the membership into the “ I was told by John Byrne that due disregard for the member’s opinion on publishing business. You, sir, should go to the demise o f American Aircraft Mod­ important issues, I hope there is a ‘name back three steps because you forgot to eler, something had to be done quickly. the Magazine’ contest for this new publi­ say ‘May I.’ I submit that only stopping heavy bleed­ cation. I would like to submit ‘THE “ I and many others remember ‘Model ing and starting artificial respiration need CANARD’ as having the right touch. Aviation’ when A.M.A. was in the red, be done quickly. It’s short, catchy, aeronautical ... and and, if we think about it, why ‘Model “ A question should be asked some­ appropriate. Aviation’ was discontinued. where along here. Will the other maga­ "Criticism is valueless without con­ “ You forgot to ask us, sir, if we zines continue to support A.M.A. by structive suggestions. I submit: would like to go into the magazine busi­ donating space to promote A.M.A.? The a. Get our o f the magazine business ness with you. I, for one, don’t want to. answer, sadly, is probably yes. Sadly, and leave it to those who know what Hell, I don’t even know you! because they are being had. They know they are doing and who pay for the risk. “ Considering the financial state the that they need the A.M.A. as much as b. Take MODEL BUILDER up on country is in, go back six giant steps. the A.M.A. needs them. The council also its kind offer to pick up the remaining “ But I digress. Let’s go back to con­ knows this. subscriptions as an interim measure. tributors. I see competition for contri­ “ Another question: What was the big c. Combine the Monthly Mailing and butors. Other magazines do pay for arti­ hurry? Interim measures could have been the Competition News. It saves on post­ cles, you know. It will take more than taken, such as; combine the Monthly age. forty articles per month, and those are Mailing and Competition News until d. In the future, make members just the ones accepted for publication, to such time as all concerned could be aware of an issue before the fact, stating feed the appetite o f eight magazines. notified, polled, and an intelligent deci­ both pros and cons. “ The price for articles will go up (not sion made. e. All o f the above. bad for the contributor), the price o f “ An offer was made by MODEL Respectfully, advertising will go up to cover the cost BUILDER to service the remaining sub­ David Meier scriptions for the balance of the year. of articles, the price for model supplies A.M.A. #5555” will go up to cover the advertising. U lti­ While this step would naturally be all mately, this will be bad for the reader good for MODEL BUILDER (Well, not The above material is the last we plan and the contributor. all. wen), especially if it carried the to publish on this matter. It is unfor­ “ You mentioned at the meeting that A.M.A. news section for the full balance tunate that this kind of distasteful busi­ you signed up many new members at of the year, it would at least provide ness has to cloud up our hobby with its the WRAMS show and they were highly continuity for an interim period. This presence. There are much pleasanter

MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 77 The historic Winter. Their decisions will be final. Its here t B k l l a n c a In addition to $100.00 merchandise S k y r o c k e t " certificates redeemable with World En­ The gines, Royal Products, or Midwest Mod­ el Supply Co., contestants will be invited SI 1.25 Afottocoufie to display their winning entries at the *1- WING SRAM. 0Α» POWER. FOR «ΑβΟ CONTROL UP TO THREE CHANNELS '° * '* * '* ' 22 V7~ WINOSPAN FOR ř^gBIN RUBBER. C02.0R 010 POWER A BIT 1976 Toledo or MACS hobby shows, A MAMRPlCENT RENOITIOM OF AN AU-TTME U V2 · WWGVAN. .020 POWER FAVORITE AIRCRAFT fcm PIA.SC AMO SMALL MU.1l OF NOSTALGIA AMO A OCUOHT TO BUILT or if this is not practical, a large color *7.15 RADIO CONTROL UNITS CAN M FLOWN FREE FLIGHT on r u m c r . photograph will be produced for show AND COMING SOON purposes. Winners will also be produced The for show purposes. Winners will also be Siearnufn C 3 B presented with a plaque designating their FOR"CU·" S 2 Λ Λ participation in the “ Winner’s Circle” for 1976. WHO’S CLARY? POWER FF*»RFC The Kirn-Kraft mail order business FLYLINE MODELS has recently been purchased by Jim St I YOU· LOCAL HOBBY DEALER 10643 ASHBY PL FAIRFAX. VA 22030 Clary, who also purchased the VECO line o f accessories (tanks, wheels, spinners, MODEL SPECIALTIES etc.) from the A & L Manufacturing Company in Van Nuys, California. Both operations have been combined under the name Clary Corporation, 2931 So. SUPER GLUE Main St., Santa Ana, CA. 92701, (714) DRIES INSTANTLY, BONDING ANYTHING TO 549-2888. ANYTHING WITH AN INVISIBLE JOINT. Dale Kirn has been appointed Vice- President and General Manager o f Clary 1 Drop covers 3/4 sq. in. Tensile strength 4 ,0 0 0 P .S .I. Corporation and is now devoting his full FAR GREATER PENETRATION THAN WHITE time (really double time) to getting the GLUE OR ALIPHATIC RESINS. operations moved and set up in Santa S U P E R Q L U É Ana. Ideal for light-weight models; Coupe, ^ * mcoihH **οο· H The job of getting the old VECO F-AAtlC» M l * ' I SwlNcipFN Peanut, Indoor, Wakefield, etc. tooling put back in operating condition, L tTTlL. B-FINVA^tJ NEW MEXICO RESIDENTS ADD -5% ONE OUNCE BOTTLE S7.95 all the machines set up, and some o f them rebuilt, has turned out to be a task MODEL SPECIALTIES CO., 9117 LA BARRANCA N.E. far larger than anyone had anticipated; ALBUQUERQUE. NEW MEXICO 87111 and Dale, being in full charge, really has his hands full! things to think about and to occupy our Magazine, will be sponsoring a monthly Production and shipping will soon be editorial space. design competition for all types o f mod­ in operation. Anyone interested in fur­ We must, however, go on record as els (aircraft, cars, boats, etc., but not in­ ther information should contact Jim or strongly opposed to the publication o f cluding plastic scale models). Dale at the above location. a fully commercial magazine by our Winners of the monthly contest will THINGS TO DO national organization. We will continue be determined on the basis o f photos and A little close on timing, but the to serve AMA as an R/C judge and as drawings submitted by modelers, and Eastern Control Line Championships chairman of the R/C Contest Board, but judging will be conducted by the model are being hosted by the . . . honest. . . we will in no way lend support to the building staff of the magazine. Origi­ Flying Goombahs M.A.C., o f Braintree, commercial publication. If this affects nality and/or craftsmanship and technical Mass., on May 18, 1975 at the Brain­ the amount o f AMA activities reported achievement will be the main factors in tree High School Athletic Field, Brain­ in MODEL BUILDER, it is because of determining the winners. tree, Mass. (Just so happens, this is the our refusal to support a business com­ The first contest deadline will be ju ly MB editor’s original home town). Events petitor, and for no other reason. 1, 1975 and winners will be announced are Fast and Slow Combat, Stunt, and WE'RE GETTING HEAVY! in the September 1975 issue. Subsequent Balloon Burst. Trophies to 3rd place In modern lingo, becoming "heavy” entries will be due the first o f each donated by Hobby town Stores, Inc. Con­ could have several connotations. In our month, and winners will be announced tact CD George Higgins (617) 479-6651 case, we hope it applies only to the the second month following each clos­ for any last-minute information. weight of our magazine. With this issue, ing. Complete information will be pub­ * * * we not only have an 8 page catalog lished in a formal announcement o f the The San Valeers (Los Angeles) Annual insert by Duke Fox, but also a double contest, to be found in the June issue of Free Flight contest, scheduled for June cover and an additional 8 inside pages, MODEL BUILDER. 28 and 29, will have an extra nice prize for a total o f 104. “ WINNER’S CIRCLE” for the Sweepstakes competition (any 5 We hope the Peanutters don’t mind The Pettit Paint Company, Inc., man­ events selected prior to the contest), a Duke’s intrusion. Actually, if you intend ufacturers of Hobbypoxy Products, will 1975 Honda Trail 90 motorcycle. The to build this month's Peanut, you would, shortly be announcing its "Winner’s Cir­ vroom-vroom is being co-donated by the like any other time, carefully open up cle" contest. Contestants will enter 35 San Valeers club and Satellite City. Also, the staples and lift out the plan . . . only mm or mounted color slides o f their Roy Cruzan, o f Taft Honda, is contri­ this month, you also lift out the Fox models, and obviously must verify that buting by knocking a substantial amount catalog. Simple. No? Hobbypoxy finishes were used. A state­ o ff the $600 retail cost o f the bike. DESIGN COMPETITION ment in 50 words or less will be required Really something worth shooting for! Colbert Industries, manufacturers o f to describe the use o f Hobbypoxy prod­ * * * the Pana-Vise line o f swiveling bench ucts. The North Bay Soaring Society is vises and work-holding accessories, in Models will be judged by Don Dewey, sponsoring the Golden Gate Classic on conjunction with MODEL BUILDER Bill Northrop, Walt Schroder, and Bill May 31 and June 1. The contest is made

78 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER up o f one day of thermal events (Satur­ day) and one day o f slope events (Sun­ day). To make things more interesting, ARE PEANUTS YOUR BAG?? the same sail plane and wing combination WALT MOONEY OFFERS TWO OF 'EM NOW! must be used for both the thermal and slope tasks. Only change allowed will be variable ballast. Slope flying will be on Mt. Tamal- PLANS BAG*I PLANS r 14 PEANUTS PLUS 2 OTHERS 14 PEANUTS PLUS STAHLWERK pais, and thermal competition will be at ORO-HUME O H7 · FOKKER V-23 VP-2 · S.E.5 · MICROPLANO VELOZ the Marin Cheese Factory (!). Deadline MEYERS O.T.W. . CAIRO L C -O E f o r d f l i v v e r · s p e e d s p it f i r e for preregistration (only) is May 15. PHALZ PHOKKER · SLINCSBY DART MILES M-5 SPARROWHAWK · OH-6 Contact Bill Pearson, 25 Rudnick Ave., PIPER VAGABONO · GEE BEE 0 WACO SRE · RENARO R-17 Novato, CA. 94947. PILATUS PORTER·ANOREASON BA-4B BUCKER JUNGMANN·CULVER DART * * * OH-6 · DRUINE TURBULENT WHITMAN'S VW POWERED RACER The High Plains Radio Control As­ HUNINGTON M-12 · MISTER MULLIGAN STAHLWERK MK R-IIIB · MONOCOUPE MO PIPES PAWNEE AND PIPER COLT. ^FOSTER WICKNER WICO OM-I sociation is a new organization made up V? o f R/C clubs from Amarillo, Plainview, ONLY *5.00 EACH (POSTPAID) FROM: WALT MOONEY and Lubbock, Texas, and Clovis, Ros­ 2912 CABRILLO MESA,SAN DIEGO, CA.* 92123 U.S.A. well, and Hobbs, New Mexico. The association’s first endeavor will be a large scale Radio Control Champion­ be a supporting air show, complete with ships, to be held on July 4, 5, 6, 1975, with wing walkers and aerobatics. For at the Hobbs Industrial A ir Park, 5 miles further info, contact the Reno News northwest of Hobbs, New Mexico. Bureau, P.O. Box 3499, Reno, Nevada Four flight lines (two sites) will be in 89505, (702) 786-3030. · operation to handle contestants in class A, B, C Biplane, DN, DE, and Sport Hannan...... Continued from page 42 Scale. A special Class A-Novice event ticular. The "Spirit of St. Louis” air­ with shortened A Pattern will be offered craft appeared in plan and kit form from to fliers who have never placed in any dozens o f sources, including the Ideal R/C competition (sounds like a good Aeroplane & Supply Company’s "New idea). An entry fee o f $8.00 covers all York-Paris Monoplane,” which according events entered. to our mail, was the starting incentive Contact J. R. Cox, 1917 N. McKinley to many a life-long interest in miniature St., Hobbs, NM 88240, (505) 393-8063. aircraft. T h e * * * We would like to see some more ^(VflN STO R Af^ The Central Jersey R/C Club is hold­ "S p irit” models in action, and offer the ing a SAMCHAMPS Warm-Up contest following information, selected from DAZZLE THE CROWDS WITH A BRILLIANT ARRAY for Old Timer R/C Free Flight, on June various sources, by way o f helping to OF DARING AERIAL MANEUVERS! 29, at the Middlesex County Model A ir­ kindle your enthusiasm for such projects. NOW! YOU can own a beautiful Vintage 1930 Fleet Biplane port, Piscataway, New Jersey. Classes A, The information concerning the real B, C, Antique, .020, and Texaco will This stand-off scale model was designed for the novice, yet craft was selected from Lindbergh’s own meets the critical demands of the expert. All balsa, spruce be flown, under 1975 SAM rules. Muf­ writings. Of particular interest is the and ply construction, with precision cut parts for exact fit Precut. one piece ply sides, preformed landing gear and flers will be required for .10 engines and fact that the machine proceeded from cabane struts, complete hardware package, and bolt-on wings larger. Contact Jim Clark (201) original concept to flight test in a mere FAST and EASY to build. 756-1364, 1127 Denmark Rd., Plain- 60 days. Many MODELS have taken A beauty to fly and it performs all the field, N.J. 07062. more time than that! hi SPA aerobatic sequences * * * Span: 46 feet Wing span . . . 49” Engine AO College scholarships amounting to A irfoil: Clark Y Wing area . . 760 tq. in. O.A Length 42" Flying weight 4-3/4 to 5-1/2 lbs. $1750 are being awarded in the Sixth Wing incidence: 0° You saw it featured m the May 1975 MODEL BUILDER Annual Model Aeronautics Scholarship C.G. range (aft o f wing leading edge): . . . now see it at your dealer or order direct Contest sponsored by the Boeing Man­ 28.4% - 29.6% Send check or money order, plus $1.55 for shipping. agement Association. The contest will be Maximum speed (clocked): 129 MPH Wisconsin residents add 4% sales tax. at the Space Center, in Kent, Washing­ Total engineering manhours expended Dealer inquiries invited. ton, on July 19 and 20, 1975. Eighteen in design: 850 C ONCEPT MODELS events in three categories are being of­ Pilotsother than Charles A. Lindbergh 2906 GRANDVIEW BLVD.. WISCONSIN 53713 (608) 27V0355 fered, open to any person 18 years o f age who flew the “ Spirit o f St. Louis” : or younger. Events cover free flight, Major Lanphir, Commanding Officer Henry Ford I (his first-ever airplane control line, indoor, rocket, R/C, and of Selfridge Field, Michigan ride!) design craftsmanship. Lieutenant Phil R. Love Edsel Ford For further info, write to Boeing Passengers carried aboard the “ Spirit” Mrs. Evangeline L. Lindbergh Management Association, P.O. Box by C. A. Lindbergh: (Lindbergh's mother) 3707, Seattle, Washington 98124, Atten­ Donald A. Hall (designer o f the air­ B. Franklin Mahoney tion Ted Caputo, Mail Stop 84-92. craft) Donald E. Keyhoe (the noted author) RENO AIR RACES Major Erickson (photographer) Earl C. Thompson For the 12th consecutive year, the A. J. Edwards (sales manager) Harry F. Byrd Reno National Championship Air Races Mr. McNeal (final assembly dept.) Harry F. Guggenheim (of foundation will take place, on Sept. 12 to 14, at Brice Goldsborough (instrument fame) Reno/Stead Airport. Qualifying events expert) C. C. Maidment (Wright Whirlwind on Sept. 9 to 11 will precede the 3-day Kenneth Boedecker (Wright Whirl­ expert) races, making it a 6-day affair. In addi­ wind expert) Milburn Kusterer tion to Unlimited, Formula 1, Sport Edward Mulligan (Wright Whirlwind Three sacks of mail! Biplane, and AT-6/SNJ races, there will expert) Total flights logged by aircraft: 174 MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 79 C A FAR MAM J'of all §eason§

The French Farman firm seems to have modelers in mind when designing their products! We offer drawings for the following Farman aeroplanes: H.F. 23 F.170 JABIRU MOUSTIQUE 1910 MONO FARMAN/FARMAN MONOWHEEL RACER »OflANS*NODiuiviNGSf«OM HUNGERFORO SPOKE WHEELS W. C HANNAN GRAPHICS PITS AND ACCESSORIES SEND 25t FOR ILLUSTRATED CATALOG Peck-Polymers P O BOX 2498 LA MESA, CALIF. 92041

free flight model design was a good flyer, SUPERIOR BALSAWOOD SUPPLY even without dihedral increases. COMPANY Recommended published references: Small model specialists should be par­ Lindy’s “ Spirit of St. Louis” by Hen­ ticularly interested to learn of a new ry Struck; FLYING ACES MAGAZINE, firm offering, in addition to standard August 1937 (rubber powered model) sizes, specialty cuts intended to ease RYAN N.Y.P. “ Spirit of St. Louis” construction of lightweight structures. by R. G. Moulton; AEROMODELLER, In addition to 1 /20th square strips, June 1957 (diesel powered free flight which are rapidly becoming the accepted model) standard size members for Peanuts, this ... this beautiful Monocoupe by Megow? RYAN N.Y.P. Spirit of St. Louis by firm offers 1 /20th x 2/20th, 1 /20th by One of the four most super-detailed Bjorn Karlström; MODEL AIRPLANE 3/20th and 1 /20th x 1/8. Additionally plans that Megow ever made. NEWS, March 1959 (highly detailed available is 1/64 sheet, a size which has We have this, plus many others, print­ scale drawings) been too long absent from the modeling ed in clean black line. For catalog, send scene. And how about 1 /40th sheet? ,50c. refundable with first order. (Though no 3-views o f the Spirit " GOLDEN AGE REPRODUCTIONS are included, the “Ryan Broughams and Perfectly logical, and yet, to my knowl­ P. O. Box 13, Braintree, Mass. 02184 Their Builders, ” by Wm. Wagner, pub­ edge, never commonly available before. lished by Paul Matt, is a fascinating booh For the complete list of sizes and prices, send a stamped pre-addressed envelope ICLOUDBUSTER RACE WINGS I on the Ryan planes o f that time, with many photos. Also scale views o f the to: Superior Balsawood Supply Co., P.O. B-5 Brougham, wen) Box 8082, Long Beach, CA. 90808. · Who will be the first to build a “ Pea­ Choppers... Continued from page 27 nut of St. Louis” ? We’d be happy to publish -a photo of it in this column! tion: make the above mentioned bell- SPEAKING OF PEANUTS crank assembly plenty stout, as it carries We received a letter from Bill Dahl­ a fair load in flight. A little later, we’ll gren, Jr., an avid control-line model talk about the installation o f the servo builder, who has recently taken up Pea­ box, so hold off for now. RUBBER SCALE PLANS FOR SIX (6) nut Scale: " ... I was operating under About this time, the power pack as­ FLIGHT-PROVEN, RARE & UNUSUAL the handicap of near-total ignorance of sembly is installed in the fuselage. The RACING PLANES: CROSBY, FLOYD BEAN. TWO FOLKERTS, SMIRNOFF how to trim a rubber powered anything, instructions are adequate, if followed. BEARCAT, and CHAMBERMAID. much less a scale (type) model, much A long shank drill is provided to drill Complete set, postpaid, only S4.00 less inside a building! They bounce good, the mounting holes, and blind nuts are order from: too. Most of my trimming (HAH!) epoxied in the holes under the bearers. CLOUDBUSTER VENTURE flights ended up in the seats, as the After the power pack is bolted in posi­ P.O. Box 2921, Livonia, Mich. 48154 thing simply refused to turn, but the tion, the model is turned upright and only damage of the day was a cracked the main rotor shaft is installed so that Total flight time: 489 hrs. 28 min. wing strut, sustained on the last flight the upper bearing can be positioned cor­ Finally, the ship was presented to the I made. I was feeling pretty happy with a rectly and blind nuts installed. This is a Smithsonian Institution, minus the orig­ series of 25-30 second flights, until I little tricky and should be approached inal spinner cap, which was given by timed Malinski’s first 84 second effort. with caution. The holes in the top o f the Lindbergh to Hawley Bowlus. The mind boggles! cabin should be drilled prior to installing Probably more models have been “ With the (blankety-blank) tempera­ the power package so as not to contam­ made o f the “ Spirit” than any other ture hovering around zero, there’s no inate the bearings with fiberglass chips! c ra ft. . . and in a few cases, models have outdoor activity at all around here . . . An accurate drawing is detailed in the even been made o f the “ S p irit" repro­ the only flying is done indoors, hence instructions for drilling these holes and ductions, used in the filming of the the Peanuts. . . though I suspect that should be followed very carefully! movie. with more rubber and prop my Cougar Now, with the main rotor shaft in­ The "Spirit” would not seem to lend would work better outdoors than in. stalled through the cabin hole and seated itself to stable model flight (Lindbergh I ’ll have to get busy on the control- in the lower bearing, the upper bearing repeatedly asserted that the instability of liners again in the spring. Meanwhile I'll can be slid down the shaft and bedded in the real machine was an important factor have a (flock, bunch, herd??) of Peanuts Endfest epoxy for an exact fit. Make in keeping him awake). And yet, Ron to start next winter’s indoor session. sure the shaft is not angled to one side, Moulton reported that the Aeromodeller Onward and Upward!” and that it is completely free to turn 80 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER NEW...TEMPERATURE COMPENSATED NYROD A ROD FOR ALL SEASONS

NEW 8" METAL ROD IS PERFECT FOR THESE INSTALLATIONS - BEND AS NECESSARY NYROD inner tubing = 3 1 » tapta NYROD outer tubing NEW! 8" METAL ROD without binding (important). The hole A t this point, the balance o f the as­ may be trimmed slightly if necessary in sembly process is pretty well defined FIBREGLASS EPOXY PROPS order to center the main shaft properly. and you should have no difficulty in any All types of racing props Sport Goodyear Rat The bedding-in process is to provide a area. For this reason, I won’t go into any FAI&BTeamRacing Free flight QuarterMidget firm base for the bearing housing in a further detail, except to pass on some 7x3.5 $3.50 7x6 Thin Hub self-aligning manner. Remember that observations I ’ve come across while 3.50 epoxy will permanently cement the plas­ building this kit. The servo installation 7x6 Thick Hub tic bearing housing to the fuselage, and was accomplished easily, however, be 7x6 Thin Hub QM 7x6 ThickHub QM 4.50 this is not desirable. To prevent sticking, careful o f direction o f rotation o f the 7x7.4 Russian Type you can use a small piece o f Saran wrap output arms. Most servos are equipped 7x7.6 Russian Type 3.50 between the cement and the housing with output arms on either side, so con­ 7x9 Speed 0.1■us J until the cement has set-up. In lieu o f necting the linkages in the correct fa­ 7x95 Speed this, you can use Stabilit Express, and shion should pose no problem, and 8x8 4.50 lightly grease the bottom o f the housing should not require special-direction ser­ 8x8.5 QMfinished All others as moulded untrimed with petroleum jelly. This will still per­ vos! After cementing in the servo box, We make props to special order Write lor Quote SASE mit the Stabilit to cure without sticking it’s a tight squeeze to make changes or Illinois Residents add 5 % Sales Tai to the housing. (Some epoxies will not relocate arms, etc. so it is wise to com­ Kelly Products Inc. PO Box 38 set up in contact with grease or oils, so plete the entire servo assembly (including Western Springs.Illinois 60558 check this out with your favorite). servos) prior to cementing in place. Be The cut-outs for the tail rotor gear­ sure to use the same holes in all bell- box are made easy by use o f wood pat­ cranks, as shown, to insure the correct terns supplied in the kit. I suggest the amount of control input. mounting holes be pre-drilled and spot­ A word about UHU plus Endfest 300: £aube ted with red ink for easy location after this is an ideal epoxy for the glass fuse­ S cale v3- Views being cemented to the vertical fin. When lage and/or metal; it is very slow curing installing the aluminum and brass tubes, but is extremely tenacious and never send stamp for /ist they should be bent exactly as shown in gets brittle. It should be good for those the plans, then add approximately a 1/4 tough to glue parts where vibration is a inch to the forward end o f the brass drive factor. I recommend you use it sparingly shaft tube to allow for any variations in so as to have enough to do the whole the former 115 installation. It may be job, and substitute a domestic epoxy for trimmed to correct length after it has the non-critical pieces. The tubes are been cemented in place. Note: the fo r­ very small, and it ’s difficult to come by. ward end o f this brass tube has to be Mix only small batches, as necessary, to Richard M. Zasadney lubricated each 5 hours of flight, so I gauge the correct amounts. It won’t set­ Z<ó6>4 B e c k St. S.£. suggest you drill a small oil hole imme­ up before you mix another batch if W a rre n , O h io 4 4 4 8 4 diately adjacent to the bulkhead for this necessary to complete the job. You can purpose, because the end o f the tube wait 10 to 15 minutes until it gets slight­ will probably be covered by the large ly “ tacky" and the parts will hold to­ out the appearance (Endfest is excellent bevel gear at final assembly. gether easier w ithout clamps (it’s very here—files down easily). Since the plastic When cementing tail fin former 162 slippery when first mixed). When work­ parts cannot be cemented adequately to in place, I suggest you Scotch-tape the ing on the fiberglass fuselage, it ’s ex­ the glass surface o f the body, a thin ve­ balsa strip 167 in place (don’t cement tremely important to sand the surface neer sheet of wood is first cemented to yet) to maintain straightness of the fiber­ lightly and degrease the area with ace­ the back-side o f all such plastic parts glass fin while the formers are cemented. tone or denatured alcohol prior to apply­ with UHU Hart (or Duco cement), then Not shown on the plans, but I installed ing cement, otherwise the joint will not the wood backing is cemented to the a scrap piece o f balsa to fill in the top hold properly. fuselage with Endfest. The latter is also leading edge o f the vertical fin to make When cutting out the plastic naviga­ used to fillet any gaps that may have a neater look. Allow enough room to tion lights and engine louvers, be sure developed. The engine louvers should be install the gearbox. Drill the hole in for­ to save as much depth as possible for outlined with the wood veneer so as to mer 115 (for the tail rotor stuffing box trimming to fit the compound curves o f allow warping to the curved shape of tube) quite a bit oversize so that later on the fuselage shell. Most o f the plastic the fuselage, and held in place with you can align the tail drive shaft proper­ parts mount on compound curves, and if Scotch tape while the cement sets-up. If ly, then cement the stuffing box tube in not carved to fit, will produce large you back the entire louver with veneer, place with epoxy. ridges that will require filling to smooth you probably will not be able to warp

MAY 1975 WHEN CONTACTING ADVERTISERS,TELL ’EM MODEL BUILDER SENT YOU! 81 to permit use of a single servo for both throttle and pitch control, and many other nice things. I'd elaborate except this article is too long now and my writ­ ing hand won’t be able to pilot my new The "Hi-Perlormance Compact” Graupner 212 for another week! See you next month. · FEATURES contour-sanded wing ribs SPECIFICATIONS Plug Sparks . .. Continued from page 55 Ming span 77 inches hank o f rubber now, one begins to doubt machined balsa & plywood parts length 39 inches weight 24 ounces the old saw, especially in view of the plug-in wing panels & stabilizer rules that allow any amount o f rubber to spruce spars be used. Some o f those models get sky high! all Hying stabilizer BROWN JR. MOTORS 8 hour building time Is that old Brown completely shot? Or does it look like it is beyond repair? it not at your oealer order direct MaS LIMITED price $27.50 Cahl fícs add 5J8 Tan dealer inquiries rnv bo*39745L A Cali· 90039 Don’t give up, men! For ten years now, Herb Wahl, o f Herb’s Model Motors, P.O. Box 31, Crum Lynne, Pa. 19022, niques. For those of you who can’t wait, has been specializing in the restoration contact Bob Fish, Fisher R/C, 17 Salmi o f Hurleman and Brown Jr. motors. If Road, Framingham, Mass. 01701, and he can’t fix your Brown, then it is truly COVERUP! send $10.00 (if the price hasn’t changed) Sturdy, dark green vinyl covered for a neat bulletin "H -1” listing impor­ a basket case! Also worth noting, besides the excel­ binders for your valued copies of tant modifications to the rotor head, lent Hurleman .48 he manufactures, is MODEL BUILDER. Gold logo. fuel tank installation, exhaust stack the new and novel Hurleman Twin Herb change, and tail rotor shaft coupling. produces. This twin is based on a pro­ The greenbacks will insure delivery o f totype conceived forty years ago and the required hardware to make those never completed. This .96 cu. in. dis­ mods (and well worth the money!). placement engine utilizes as many ori­ One last thing before signing off... I ginal parts as possible and is modestly have never, repeat never, been able to priced at $280.00 (have you heard what satisfactorily adjust or break-in any en­ they are asking for Morton 5 engines gine while installed in a helicopter, and now?). Orders are filled in strict sequence this one is no exception. So, while you’re and as Herb says, he is slow because it is building that dream-ship, take a bit of evening work only! Best idea is to send advice and put the engine on a test for Herb’s excellent catalog. Include 504 bench and break it in for a couple of for the catalog and postage. A real gem! hours. Find out specifically how to ad­ Finally heard from Paul Gilliam. Most just the carb and needle valve setting modelers, particularly in Southern Cali­ under ideal conditions, before fighting fornia, w ill remember Paul for his out­ it in an expensive chopper. Always re­ standing work and long line o f “ Civy Only S4.95 each, two for $8.95, or move the clutch assembly and clutch Boy" designs. three for $12.95, postpaid in the US. shoes when test running in this fashion!! Paul dropped out of modeling to do Canada and Mexico add 30 cents per FINAL APPROACH film work in Arkansas and Missouri. binder. Overseas add 50 cents each. More news from Kavan for you Jet While shooting film with the company California residents add 6% sales tax. Ranger owners: the first "Gadjet” is a on location, he contracted Rocky Moun­ NOTE: One binder will hold 1971 and newly designed rotor head which does tain spotted fever, sometimes called 1972 issues. One each for 1973 and 1974. exactly the same job as the previous “ tick fever.” Not too many survive this, head, but much, much simpler in appear­ but after being given up for lost several MODELS ance and operation. It is expected to be times, Paul finally managed to survive BUILDER available on special order for experienced the dreaded disease. Box 4336, Santa Ana, Calif. 92702 fliers in about two more months, and is "L u cky” Moody was the first to hear presently scheduled to be included in from Paul in the hospital. Gilliam is now it to the desired curve. the newest kits in about 6 months. located in Quincy, Florida, and has built Before final installation o f the tail Another goodie is the new “ Swash-out” about six models in his spare time. Look rotor gearbox, the brass tail rotor hub attachment for eliminating the stabilizer out you contest-minded Floridians! Paul should be disassembled by unscrewing paddle pitch changes with swashplate will have your scalps yet! the two Allen set-screws and removing (collective pitch) motion. Should be (Note from Bob Hunter: Paul can be the hub. Flat spots should be filed on available within another month as an reached at Studio Martin, 209 W. Jeffer­ the tail rotor shaft where the set screws accessory at about $15.00 per copy. I son, Quincy, Fla. 32351.) have made an indentation and the unit mounted both of the above modifica­ SANDBAGGING THE SANDBAGGER reassembled, using Loc-Tite. This is to tions on a shaft so you could get a basic For years, Larry Boyer, o f San Diego, prevent losing directional control in case idea of what they look like ... see pic­ has been coming to contests and entering the hubs slip on the shaft. It is not neces­ ture in this article. Also new is a scale during the closing minutes of the con­ sary to remove the adjustable yoke or size rubber "S ” channel for installing test. Many times, the weather has devel­ other components when performing this your windows in the Jet Ranger, avail­ oped beautifully and thermals are out modification. able now at approximately $2.50 for 16 like crazy. Of course, by that time, most Next month we’ll conclude this re­ feet. New, profusely illustrated instruc­ contestants have completed their flights port with data on other modifications tion manuals are expected to be available and Larry has been singularly successful which can or should be made, along in another month, and will show several in winning many contests at the very with adjustment, trim, and flying tech­ methods of modifying your servo plate last minute. 82 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER A t the Buckeye Southwest Regionals, the big meet for the Southwest at that time of year, Bob “ Satellite C ity” Hun­ ter decided to have a little fun. Happily, ^ W M IN I by "sheer coincidence,” Bob was sitting in first place in the old timer events G L U E G U N with some very good flights from his Zipper. Fits Ambroid, Wilhold, Bridi Bob advised Larry to wait a while Super Stik, Titebond and others. as the weather was not just right for Made o f durable polypropelene good thermals. This routine continued Iseals with a "T "p in ). Please add until in mock alarm, Bob said that Larry 25 cents for postage and handling. better fly as time was running out. Time did run out on Larry as he had waited CALIFORNIA Dealer and too long. He was unable to complete all RESIDENTS Distributor 3 FOR 99* ADD 6% TAX flights. inquiries invited. Sandbagged! (By an expert, no less.) 6 Y το n NEW COVERING P RODUCTS BOX 6423, ORANGE, CALIFORNIA 92667 With the price of silk covering going out o f sight, good news comes from IDENTIFIED! Harry Montgomery, of New Castle, Pa., In January, we ran a photo of the who has been using a product called ace­ Zaic “Contestant,” with builder un­ tate sheath. This is a man-made, silk-like known. Just got a letter from J im Miller, YANKEE fabric that is used primarily for ladies of Cincinnati, Ohio, who sez he is the dress lining. Best part of it all is the proud builder. Had tough luck at Lake- price, 99

MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 83 rear, permitting the two ventilating holes in the top and bottom of the motor case VL-101 ELECTRIC FLIGHT SYSTEM to be in front of the firewall. With this Featuring location set, the motor was then cement­ ed to the firewall, with no other attach­ HYTORK 48 MOTOR ments necessary. & ve\e PLANETARY GEAR UNIT Down thrust was established by instal­ GO' Flying weight 2 V; 0 2 . will power 25 to 50" ling the motor normal to the firewall in wingspan weighting up to 10 0 2 . all directions and no compensation was made for torque. i « • VL-101 Electric Flight System $19.50 The switch and charge harness were • FC-66 Field Charger $29.50 installed in front of the forward cabin • Instruction Book Only $ 1.00 • Catalog 2 5 t bulkhead since the cabin was going to be Add 10% for Postage & Handling very full with other equipment neces­ PRODUCTS Send Check or M.O.. NO COD'S sary for electric flying. DIVISION OF VISTA LAB > Calif, add 6% Sales Tax Motor batteries were installed against w 7023-D Canoga Ave. the forward cabin bulkhead as shown in W/Λ Canoga Park. Ca. 91303 See Your MODEL DEALER or ORDER DIRECT Hobby Dealers send for Information the photographs. The Pulse Commander actuator was installed in the position prescribed in the plans. The radio bat­ INTRODUCING teries were mounted, with servo mount­ "HOOKER" « n ing tape, on the floor o f the cabin in front o f the rear cabin bulkhead. $2.49 ADJUSTABLE BALLAST-LOK TOW HOOK The only other change in the kit was $ 1 .9 5 the installation of cooling scoops for the motor batteries. I used Astro Flight’s •STRONG PIANO WIRE HOOK •MOUNT FOR BALLAST Electra-Fly scoops by installing one on the bottom of the model, wi th an oblong •FLIGHT WEIGHT 5.5 GRAMS •SAFELY HOLDS 16oi hole about a half inch wide and an inch OR MORE l] long, centered under the batteries. Then DIECAST ALUMINUM BODIES I took some three-quarter inch foam EASY FIELD ADJUSTMENT and made a bulkhead the width and height o f the cabin area. I cut 3/4 inch I INCLUDES MOUNTING HARDWARE o ff the top o f this piece o f foam, instal­ I J AVAILABLE AT FINE HOBBY SHOPS EVERYWHERE ling the large piece behind the batteries. U Then I took the quarter-inch blue foam A 0 D 35 POSTAGE AND HANDUNG CA.RES. ADD 4 V. SALES TAX packing which comes in the top o f the SCOTT RESEARCH CO., P.O. BOX 22, COSTA MESA, CA. 92627 Astro Flight 020 motor box, cut a strip o f old ignition engines, hence the reason slight spiral dive to gain speed, and with the length o f the Pulse Commander radio for so many rubber contests. Bob Oslan a reversal to the right, the model went receiver, and wrapped the receiver in already provided a good Super Cyclone. up into a loop from which he rolled out this quarter inch foam. Then the re­ Any other help out there? Horstavagen at the top. After several maneuvers and ceiver was placed on the floor of the cab­ in area between the foam bulkhead and 15, 703-63 Örebro, Sweden is the ad­ about four and a half minutes in the air, the actuator bulkhead for a perfect fit. dress. Sonny began to position for landing. The piece of three-quarter inch foam re­ THE LAST WORD Even though it was quite windy, he moved from the foam bulkhead behind Thank you for all those cards and made the landing about one hundred the motor batteries was then placed on letters (shades of Lawrence Welk) telling feet from his launch point. top of the actuator bulkhead. When the me how much you enjoy the column. The final evaluation by all o f the wing was placed in the wing saddle, this Don’t tell me, men, tell Bill Northrop. flyers was that the model proved to have created a closed compartment. Then a Otherwise, how do you expect us old more than adequate power, that it was one-half by one inch hole was cut into timers to take over the mag? Lettum very stable and easy to fly, and we were the center o f the foam wing so that it know who reads this stuff! particularly impressed by its windy wea­ was located just ahead o f the foam block (just in case you Old Timers don't ther flying characteristics for such a light on top o f the actuator bulkhead, in this start your own magazine. . . Why not? weight m odel. . . 17 ozs. loaded. manner creating an exit for the air for Everybody else is . . . You 'll always have As most builders know, the Ace Sys­ the motor battery compartment. a home in MODEL BUILDER! wen). · tem o f construction is very simple and Another Astro Flight air scoop was straightforward and the fuselage went put on top of the wing, with the opening E le c tric ...... Continued from page 31 together without any difficulty. In pre­ to the rear, to create a perfect flow ­ asked to evaluate the Dick’s Dream with liminary balance checking we established through ventilation system for cooling the Astro 020. that the simplest way to install the motor the m otor batteries. This was not Sonny’s first experience was through the firewall. Since the diam­ The entire kit, other than the modi­ with an electric, since he had been flying eter of the motor only leaves about an fications for the motor installationsand our Bushmaster with the Astro 25. How­ 1/8 inch of wood in the plywood fire­ battery cooling, was constructed in the ever, it had been a long time since he had wall on either side, it was decided to manner prescribed in the instructions flown anything with single channel, and simply center the motor in the firewall provided in the kit. Since the Dick’s he was altogether a little dubious about and the hole was drilled to accommodate Dream is built with the Ace foam wing, the 020 in the Dream. From the launch, the motor. we decided on Solarfilm for covering his opinion changed. He was particularly Themotorcase is slightly bell shaped, materials. Before covering, the wing was impressed with the climb-out, and again, having the small diameter at the propel­ block-sanded with 240 sand paper to circling to the right, he gained altitude ler end and enlarging slightly to the rear. remove the slight mold marks and pro­ in preparation for maneuvers. The hole diameter was established to al­ duced an excellent finish. Gold metallic Turning to the left, he went into a low the motor to slide forward from the Solarfilm was used on the wing and hori-

84 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER zontal tail surfaces, and maroon metallic Solarfilm was used on the fuselage and W r i t e F o r FREE BROCHURE vertical surfaces. All-in-all, we were quite pleased with On Our Complete Line Of the project. The results produced a good looking small model, more than ade­ R/C PROPORTIONAL EQUIPMENT quately powered, and none o f the con­ including struction processes were d ifficult or re­ quired unusual expertise in modeling. WORLD'S SMALLEST SUPERLIGHT The airplane is very stable and easy to fly, and should be no problem for the DIGITAL CONTROL SYSTEMS beginner. SMALLEST SIZES LOWEST PRICES What I was particularly pleased with was the fact that it’s an excellent small 13400-26 Saticoy Street field airplane that can be flown in almost any populated area where there is suffi­ North Hollywood, Calif. 91605 cient clear space for a landing, without Phone (213) 764-1488 disturbing any of the local citizenry. I can't imagine any school yard that would not be adequate for flying this f \ m odel. . . Silent flying is here to stay. · TWIN-WELD Twm Wno EPOXY Counter.... Continued from page 7 CfJCfCi/ Ideal For Bonding The Following all o f high quality crepe rubber. Packs • HARDWOOD TO FIBERGLASS are 39 cents each, $3.90 for a card o f t ť · Æ v S S S f • FIBERGLASS TO FIBERGLASS M Ě Q f w 10 packs. i • METAL TO FIBERGLASS You’ve heard the old saw “ You must m g t m Ě š Ě • HARDWOOD TO FOAM CORES use our thinner with our paint.” Well, in f v / n l r FIBERGLASS REINFORCED the case of Flo-Kote, it seems to ring REMAINS FLEXIBLE true. Ordinary, run-of-the-mill lacquer » . Available st your favorite dealer thinner won’t do the job. Try some CPM Flo-Kote thinner, at $2.50 per MIDWEST MODEL 1 quart, plus $1.00 postage and handling, GENERAL PURPOSE ADHESIVE ■ ]'l 1 H I 1 — you’ll see what we mean. Inkadently, ^ IN PASTE FORM FOR EASY USE. J inflation has hit Flo-Kote Nitrate too ... 4 n i l u vf; >unm . u is i k iiu t o h , sn u i\t. m m h.n s f o k <>i n < t o >f. i k > it ’s now $3.50 plus a $1.00 P and H, however, its high quality makes it go the difference between a racer and a dog order to keep the tips from stalling out. farther than ordinary airport stuff. · on these small planes. Make certain that This set o f warps is used to increase the your radio is in top condition and that aerodynamic efficiency o f the surface. Sea Fury .... Continued from page 21 your engine and fuel system will keep Sometimes stabilizer tips are washed-out 500 ma battery will also fit, but watch on working, since you have to go the very slightly (1/32) for the same reason. that CG! The switch can be mounted whole ten laps in all the heats in order to Wayne Drake did so on his Nordics, and on F7 with a pushrod to the outside, or win. If you have any questions or com­ claimed that it made the ships signifi­ you could just mount it in the fuselage ments, write to me at 1010 N.E. 122nd cantly more sensitive to lift. side. Make sure that all the assorted Avenue, Vancouver, WA 98664, or c/o Wash-in may also be used as a glide wires and pushrods clear one another. MODEL BUILDER. trim, such as on A/2 gliders. One of the Your best engine choice is a Kirn Good luck. · more frequent problems facing large Kraft TD .051. A pen-bladder/pacifier gliders is a tendency to spin in under pressure system works well on TD ’s, but F /F ...... Continued from page 49 glide . . . particularly when flown in tur­ remember that, with or without pressure, Why warp? The need for warps in bulent or very thermally conditions. A you have to be able to consistently start most pylon type AMA gas ships is to very slight (1/32 to 1/16) wash-in on on time, so use a system you can cope keep the ship from spiralling in to the the main wing panel which is on the with during the tension o f a race. right under power. The higher the power inside of the glide will cure such a condi­ The cowling is from a 2-1/2 inch or the smaller the flying surfaces, the tion, and the effect on the performance diameter plastic bottle I found at the more the need exists for warping the o f the ship under tow can usually be local drug store. Look for one that is wing. The warp I am speaking about is offset by a slight change in the auto­ opaque (mine had Flowers o f Sulphur called wash-in. Wash-in is applied to the rudder setting during tow. in it... anybody need a lot of that right main wing panel o f a typical pylon Warps are, for the most part, built in stuff?) although I saw many translucent style gas ship. Wash-in raises the leading while the model is being constructed. ones that could be used if you don’t edge of the wing some nominal amount Sometimes, more warp (wash-in) than is mind painting the entire cowling. Mount (usually 1/16 to 1/4) over the trailing needed is built in, in which case it can it onto the hardwood blocks on the edge at the polyhedral joint (see sketch). sometimes be "dewarped" by heating sides o f F2 using sheet metal screws. . . The effect is to force the right wing to the wing when completed and bending it two No. 2 X 3/8 inch screws, about 1/2 fly at a slightly higher angle of attack in the opposite direction. If this doesn't inch apart, work well. and to keep the right wing from dipping, work, usually some rudder offset or My canopy was heat-formed in the causing a spiral dive. On a small model thrust offset will correct the excessive kitchen oven from acetate over a carved (Mini-Pearl, for example) such wash-in wash-in and make the model control­ balsa mold, although you might be able is critical. lable, even though the excessive wash-in to find a commercial unit you could Other warps may be considered, but will tend to detract from the model's adapt. for different purposes. Usually, on rec­ performance. Some miscellaneous thoughts: Keep tangular wing planforms, the tips may be Less than enough wash-in can be cor­ it light. An extra ounce or two can make washed-out (trailing edge up slightly) in rected by the heat warp method men-

MAY 1975 WHEN CONTACTING ADVERTISERS,TELL ’EM MODEL BUILDER SENT YOU! 85 use thin dope and only one coat. With this thin wood it is easy to get too much V V I N T A G E R/C P L A N S yf. curvature if too much dope is used. X PLANES WORTH MODELING To locate the wings, two root ribs R/C MODELS WING SPAN PLAN SHEETS PRICE are cut out o f 1/16th balsa and cemented B-25H" MITCHELL" 71" 1» $ 13.50 to the sides o f the fuselage. Be precise " " PUSTÍC ENGINE COWLS...... PAIR $ 9.00 in their location because they locate the CONSOLIDATED PBY-5A "CATALINA" 108" 4 $ 13.50 wings on the model. When dry, cement " PUSTÍC ENGINE COWLS...... PAIR $ 9.00 the wings in place against the sides o f the “ GUN BLISTERS...... PAIR $ 6.00 fuselage and on top o f the root ribs. PIPER PA-8 "SKYCYCLE" 60" 3 $ 10.60 Block up the tips for the proper dihedral P U S T ÍC CANOPY...... EACH $ 8 .5 0 and let dry. " " P U S T ÍC ENGINE COWL...... EACH $ 7 .6 0 The tail pieces are simply cemented SEND 5 0 CENTS FOR CATALOG TODAY !! ADD $ 1 .0 0 POSTAGE PER P U N in place on the fuselage, make sure they DISTRIBUTED IN CANADA- DEALERS & DISTRIBUTORS WRITE- are properly aligned. RAM S A L E S ,1 0 2 7 C U R K E SID E ROAD, S ID MORGAN,1 3 1 5 7 ORMOND LONDON,ONTARIO,N5Z 3B1 BELLEVILLE,MICH. 48111 Add the two-piece, “ V ” shaped wing bracing post to the bottom o f the fuse­ lage and then add all the bracing wires. Two-pound test monofilament fishing leader was used on the model in the pic­ R/C HELICOPTER SUPPLY & tures. I like it because it is strong, light, Graupner somewhat resilient, and can be tightened SERVICE CENTER by the application o f a little heat. Thread also will work for the bracing. The propeller on the original Blériot was a four bladed paddle affair, so we decided the flying propeller could easily be scale-like in shape, although larger in diameter. Clear, .015 plastic was used for the paddles. A couple o f large se­ quins provided the plastic discs for the front and back o f the hub. Don’t forget to put a propshaft hole in the birch dowel assembly before bonding it all You can't fly the Bell 212 Twin Jef R/C helicopter w ith a busted rotor blade, nor o broken collective itch arm, or even a metric bolt missing thot holds the engine down. But we can h e lp .... re a lly .... with epoxy. A short length of prop Our stock includes lots of metric nuts, bolts & washers, and most any other part that is borken,missing shaft wire through the hole while the or lost for the Bell 2 1 2 ...... a complete stock to get your helicopter back into the a ir. And you can epoxy is setting up is required. Twisting call DAY or NIGHT - Seven days a week-for our electronic phone answering machine w ill record your it carefully with a pair of pliers while order (if we are elsewhere). Phone orders received by 3 pm are usually shipped w ithin 8 hours unless pulling it out will make removing it the Post O ffice or United Parcel Service is closed. Mail orders are handled w ith the same speed. So from the hub easy. Epoxy the paddles to when you need helicopter ports - RING US UP or MAIL YOUR ORDER - WE CAN SUPPLY - FLASH - New Bell 47G helicopter flown at Toledo scheduled for shipment obout 15 July 1975...... the dowels at about a 35 or 40 degree SCRATCH BUILDERS - Use reliable collective pitch components in your own design -Proof of perform­ blade angle. Paint the propeller silver ance - Graupner Bell 212 Helicopter set 3 World Helicopter Records in 1974 - Send 25c for catalog. with plastic model paint. u n n n U C f Ι Γ Λ D T C D c 14695 CANDEDA PLACE, TUSTIN, C A . 92680 Cut the cockpit opening out o f the * * * * * C L I V» w I C K 9 24 Hpur-7 days a week Phone (714) 838 9738 top of the fuselage. The dummy engine can be made up out o f scrap balsa, or it tioned above, or by glueing a triangular sides at the nose. Cut the blocks to can simply be drawn onto the top o f the cross section strip of balsa (like trailing match the side view. Cement them in fuselage with a fine black felt pen . . . or edge stock) on the back of the trailing place on the front face o f the first for­ even just cut out o f the plan and pasted edge, bottom of the wing main panel at mer. Then cement the nose top and on. If you elect to make it up out of the polyhedral joint (see sketch). bottom skins in place. When all the rest balsa, a hole will have to be cut in the There are other ways to control pow­ o f the fuselage has been assembled and top o f the fuselage to accept it. This will er and glide, but warping is one o f the its cement is thoroughly dry, the nose require a cut out of the first former as easiest and most effective . . . as long as can be carefully carved to the shape well as the top skin and nose side blocks. shown in the top view. Note that the it is planned as part of the model. · Make a 1 /64th sheet balsa tray to fit in nose was of square cross-section all the theengine opening and build the dummy Peanut...... Continued from page43 way to the very front, so don’t acci­ engine in that. dently sand round corners on it. 3/8th sheet, if you have a small piece The landing gear wires are a little available. The extreme nose of the mod­ Before assembling the wings and tail complex to bend, but with a little care el fuselage consists o f a plug made up o f to the fuselage is the best time to add they are not hard to do. In the right a piece o f 1/4 and a piece of 1 /8th rib, spar, and structure indications on wing panel are isometric sketches o f the balsa. If you don’t have some o f these the model, if desired. The real airplane landing gear wires. All the lengths shown sizes in your scrap box, laminating the was completely covered with fabric, not between the bends are true lengths. The thicker pieces out o f layers o f 1/16th left open on the aft end o f the fuselage angles, o f course, are not true in the iso­ sheet will work well. as on later Bleriots. Therefore, the mark­ metric, but are correct in the front and Assembling the basic structure is ings are not absolutely essential, but if side views. The gear is bent so that it is quite simple. Note the direction o f the done rather subtly, they look good on attached to the outside o f the bottom grain in all the parts. Because the nose an old fashioned airplane. I used alight fuselage skin. of the Blériot IV tapers down quite brown felt pen for the ribs, spars, lon­ The main gear is much more compli­ rapidly in the plan view, and bending a gerons, and uprights. I used a light grey cated than the simple wire, and the rest full length sheet fuselage side that much felt pen for the wire braces. o f its members are made up o f thin would require a lot of nose formers and When developing the airfoil section strips o f model railroad basswood ce­ patience, we opted for thicker stronger o f the wings and horizontal tail pieces, mented in place. Let these pieces touch 86 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! MODEL BUILDER the wire but do not cement them to the wire. This allows the wire to absorb a CLASSIFIED ADS landing shock without putting any load Non-commercial: Rate is 25 cents per word with a minimum of $3.00 worth. on the wood parts o f the main landing Commercial: Rate is 40 cents per word with a minimum of S5.00 worth. No gear. Monofilament "wire” was used for mail-order discount house ads knowingly accepted. All ads are payable in advance and may be for any consecutive insertion period the rear landing gear brace. Wrap thread specified. Name and address free. Send ad and payment to: The MODEL BUILDER. around the uprights to simulate the Classified Ads, 1105 Spurgeon, Box 4336, Santa Ana, California 92702 springs. Paint the landing gear details SPRUCE PLYWOOD: Equal strength but "BLACK K N IG H T " Spark Ignition Engines. black. I used Fulton Hungerford’s wire 30% lighter. The best possible construction .10 - $43.50, .15 - $45.50, .25 - $49.50. wheels. F.H. Wheels, 1770 Lilac Circle, plywood. 1/8" - 1/4" sample sheets and Prices include coil, condenser, plug, and lead Titusville, Florida 32780. These wheels data sheets, $1.50 postpaid. Price list upon clips. Postage $1.25, Californians add 6%. are not cheap but they are really quality request. 1/20" dry veneer now available. Chandler Engineering, 7858 Farralone St., David C. Fleming, 2392 Northtree Ct. N.E., Canoga Park, Cal. 91304. products. Besides, they will outlast two Salem, Oregon 97303. HELICOPTER BLADES. Machined Clark Y or three Peanuts, so the price isn’t too GEORGE ALDRICH custom fitted engines airfoil. You fit and finish. Matched sets of tough to take. I recommend them. for satisfaction and top performance in R/C, select hardwoods, 3 0 " long, 2-1/8" chord. For a source o f Peanut scale wood, in U-Control, and Free Flight. Send S.A.S.E. $7.65 a pair, shipped Air postpaid. No COD. Rotor Eaze, Box 1066, Ogden, Utah 84401. thicknesses o f 1/32, 1/40, 1/20, and for price list and information on new MAG­ NUM fuels. 3219 Shady Springs, San An­ LIGHTWEIGHT SILKSPAN: Red, yellow, 1 /64th, write to Mike Taibi, 4339 Con- tonio, Texas 78230. blue, white. Ten sheets for $2.50. Caiif. add quista Ave., Lakewood, Calif. 90713 WANTED: Any Pittman boat motors, acces­ 6% sales tax. Jerry’s Hobbies, Box 2122, for a price list, send him a stamped, sories, catalog sheets, especially 7501,9003, Santa Ana, Ca. 92701. self-addressed envelope. 20-341. No Dumas. Gregory Slivinski, 7282 CUSTOM SAILPLANE WING COVERS: Rogers Ave., Pennsauken, N. J. 08109. This model is easy to fly, but it has Protect wings, ease carrying. Cloth, Velcro fastener, center divider. State model/span or one characteristic that will surprise you. GOLDEN O LDIE KITS: Pre-cut, $7.50 plus $1.00 postage. Plans $2.50. Span 32 inch, send planform. Under 100": $8.95, 100 - It wants to turn right under power. 1/4A-1/2A, E387/Mod4,10 airfoil 800 ft/- 120": $10.95, over 120” : $12.95. No COD. This right turning tendency is caused min climb, beautiful glide. New design high Roell Models, Box 2351, Palos Verdes, Ca. by the large sub-rudder. The rudder is wing cabin FF looks like an Old Timer 90274. shown in the top view as bent to turn Berkeley kit. Plans available: 6 ft. span ver­ Speed Equipment: Cars, R/C, planes, boats. sion, 3 channel R/C $6.50. Eric Lister, 953 Hop-up, chrome, ultrasonic cleaners. SASE the model left. With this amount o f rud­ Klockner Road, Trenton, N.J. 08619. plus 50d. Franny's Chrome, 513 Vesta Place, der adjustment, the model flies in large SAILPLANE DESIGNER'S HANDBOOK: Reading, Pennsylvania 19605. right turn circles and works very well Design instructions, 180 airfoils, 63 designs, Model airplane plans. Peanut, rubber, C O j, indoors. Outdoors with more power, it 3rd printing, $4.96. Eric Lister, 953 Klock­ gas. Free list. Send self addressed, stamped works well as long as there is any power ner Rd., Trenton, N.J. 08619. envelope to: Modernistic Models, Box 6932 Burbank, California 91510. being developed by the rubber motor. R/C EXACT SCALE PLANS: Curtiss Hawk TISSUE PAPER for Rubber Scale Planes. It will spiral dive to the left in the glide, P6E, 2 " scale - $8.50; Curtiss Hawk P6E, 1-1/2" scale - $6.50; Curtiss Goshawk F11C- 20 by 30 inch sheets, 1 Orf per sheet. Stamp­ however. For outdoors, it might be bet­ 2, 2" scale -$8.50; Stinson Reliant SR9, 2" ed envelope brings free sample of all 19 col­ ter to use left thrust line adjustments scale - $9.50. Add 65d for postage. Richard ors. Bill Wilson, P.O. Drawer U, Kountze, rather than the left rudder to cure the E. Barron, 1213 Holly Spring Lane, Grand Texas 77625. right turning tendency. · Blanc, Mich. 48439. W ANTED: Original plans or preferably kit Extensivecollection magazines, old and new, for Hal deBolt's Live Wire "Custom" Bipe, and vintage plans. Lists. 50d stamps. L. M. also other early deBolt kits.. Contact Joe F/F Scale .... Continued from pege 41 Guerrieri 107 Alameda, Redwood City, Nagy, 317 Sunset Dr., St. Thomas, Ontario, problem is to make two copies o f the California 94062. Canada N5R 3C6. Phone (519) 631-5940. templates, but one copy is made in re­ verse. I use a 3M Copier which is.cap- INDEX TO ADVERTISERS able of making reverse images. (I’m sure that 3M didn’t intend for this to be the Ace R/C, Inc...... 61 Model Helicopters ...... 86 normal procedure. Flowever, when plans American Balsa Corp...... 67 Model Rectifier Corp. (MRC) . . 8th Cover show only half o f a stabilizer, etc., I Astro Flight, Inc...... 71 Model Specialties Co...... 78 copy the half in reverse and now I have Cannon Electronics, Inc...... 85 Walt Mooney Peanuts ...... 79 the matching half.) By picking out the Carr Sails...... 71 Sid Morgan (Vintage Plans)...... 86 same bulkhead half from each sheet Cloudbuster Venture ...... 80 M&S Ltd...... 82 you’ll have two identical halves. The Concept Models...... 79 Nelson Model Products ...... 66, 85 other way of doing it is to rubber cement Jim Crocket Replicas ...... 65 Peyton Products...... 83 one bulkhead half onto a folded piece Dumas Products, Inc. . . . John Pond O.T. Plans ...... 60 o f paper then cut it out. Flying Scale Models .... Proctor Enterprises...... 70 Once all of the bulkhead templates Flyline Models ...... 78 Pro-Line Electronics. Inc. . . . 4th Cover have been cut out, I mount them onto Fox Mfg. Co...... Center Spread REMCO ...... balsa using rubber cement (see photo). Carl Goldberg Models ...... 72 RG's R /C ...... 70 (Incidentally, another advantage to this Golden Age Reproductions ...... 80 Rocket City Specialties ...... 66 jig set-up is that you can use 1/32 inch W.C. Hannan ...... 80 RS S y s te m s...... sheet for the bulkheads, since they are Heath Co...... 57 Satellite C ity ...... 65 supported during the construction.) Each Hobby Hideaway...... 65 Scott Research ...... bulkhead is rough cut from the balsa HRE, Inc...... 74 Sig Mfg. Co...... sheet, leaving the centers still intact, Kavan Model Aircraft, Inc...... 1 Sonic-Tronics, Inc...... 68 then I sand them to final shape. K&B Mfg...... 64 Sterling Models, Inc...... 62, 63 To facilitate accuracy in cutting the K&W Enterprises...... 73 Su-Pr-Line Products, Inc...... 81 keel notches, perpendicular lines were Kelly Products, Inc...... 81 Top Flite Models, Inc...... 69 drawn on a sheet of paper. The bulk­ Kraft Systems, Inc...... Victor Model Products ...... 73 heads are placed so that the notches Leisure Products ...... 83 Vintage A ero ...... 68 interesect the lines, then the notches are Marine Specialties...... 76 VL Products...... 84 cut out. You will note that only the Marlow Engineering ...... 70 Vortex Model Engineering ...... 75 front bulkhead has all of the stringer Model Builder Binders ...... 82 Williams Bros...... 60 notches removed. I have found from Model Builder Products Richard Zasadney...... 81 past experience that the stringers do not MAY 1975 WHEN CONTACTING ADVERTISERS, TELL ’EM MODEL BUILDER SENT YOU! 87 No. 2753 FORD TRI-MOTOR $2.00 STICK 'EM PATTERNS FULL-SIZE PLANS Super-light rubber scale model of famous SERVICE Tin Goose, 32)4" span. By Tex Newman. "Stick 'em Pattern" numbers correspond to plan numbers. Order with plans and they'll (with instructions) No. 275-O.T. MYSTERY MAN $5.00 be mailed together . . 3rd Class. Add 504 Famous Elbert Weathers Class C gas job. per set to mail patterns 1st Class. Used takeoff dolly. By Phil Bernhardt. No. 5751 FLEET BIPLANE $4.00 CALIFORNIA RESIDENTS ADD 6% TAX. Fast-building 2" Sport Scale R/C model No. 1751 R/C TYRO TRAINER $3.00 of famous 1930 bipe. By Romey Bukolt. Powered glider with removable .049 pow­ No. 575-O.T.SP MERCURY S3.25 er pod/hatch. Span 74” . By Hank Cohan. No. 11743 SP "C-QUELL" S3.95 No. 5752 SEA FURY S3.00 No. 1174-O.T. SP LANZO STICK $1.95 Semi-scale model of WW II British fight­ No. 1752 BEACH'S FLYER $2.50 No. 91074-O.T.SP BUHL PUP $4.95 er, for 1/2A R/C pylon. Jerry Holcomb. Stagger-wing-bipe,canard-tracter for .049 No. 874ISP WOODY PUSHER $1.95 Super-simple, but wild! By Kloth/Beach. No. 874 O.T.SP POWERHOUSE $3.95 No. 5753 GREMLIN S2.75 No. 175-0.T. FLYING QUAKER $5.00 No. 7741SP CURTISS A/12 SHRIKE $3.95 Sharp little Half-A C/L Stunt model. Will First gas model kit by Megow, 1937. No. 774-O.T.SP OUT *0 SIGHT $2.45 do complete schedule. By Tom Dixon. Span 7 ft. Redrawn byPhil Bernhardt. No. 6741SP TRIXTER BEAM $2.95 No. 674-O.T.SP RED ZEPHYR $3.95 No. 575-O.T. MERCURY S4.00 No. 12741 85'H A R B O R TUG $8.00 No. 12711SP CURTISS-W RIGHT Jr. $3.95 Designed by Ben Shereshaw, kitted by Complete plasn (3 sheets) for R/C tug. No. 574 O.T.SP T-D COUPE $2.95 Scientific. 72” span. By Phil Bernhardt. All wood, 37" LOA. By Francis Smith. No. 11731SP BIG JOHN the FIRST $5.95 No. 12742 WACO SRE S3.75 Watch this space for more patterns to come. No. 4751 R/C AUTOGYRO S3.50 Big (39" span) rubber powered scale cab­ Semi-scale twin rotor R/C autogyro for in biplane. A classic! By George Clapp. .35 engines. Very stable. By Skip Ruff. No. 12743 MOON DUST $2.75 No. 8741 WOODY PUSHER $3.00 No. 4752 OKIE BIRD $3.50 C/L Stunt ship for .35 engines. Foam or Easy to build & fly semi-scale R/C home- Red hot Class A/B free flight. Plans show built-up wing. Span 50” . By Jack Sheeks. built. like C.W. Jr, .09-,15. Chris Moes. sub fin and rear fin types. By Jim Clem. No. 1274-0.T. THERM'L THUMBER $3.00 No. 8742 AMERICAN YANKEE $2.00 No. 475-0.T. G.H.Q. SPORTSTER $4.00 Hot Class A or B pylon type gas model. All sheet balsa 1/2A profile C/L scale. From July 1936 M .A.N., also kitted by Span 48". Redrawn by Phil Bernhardt. Sport or Proto Profile. By Bob Sargent. G.H.Q. By Louis Loutrel. Phil Bernhardt. No. 11741 CESSNA 150 $2.00 No. 8743 MACCHI MB 308 $1.50 No. 3751 CURTISS F9C-2 $6.00 Small R/C semi-scale for 1 to 3 channels. Rubber scale ship for floats or trike gear. Navy airship-based "Sparrow Hawk” bi­ Modified Ace foam wing. By Fred Reese. Great flier, 26" span. By Walt Mooney. plane, 1-1/2” scale C/L. Charlie Smith. No. 11742 HUGHES "300" $1.50 No. 874-O.T. POWERHOUSE $4.00 No. 3752 CALL-AIR SNOWCAR S2.50 Lightweight 22" rotor span, rubber pow­ Taibi's famous design for Forster 99 ign. Radio controlled, semi-scale prop-driven ered in-or-outdoor ‘copter. Roy Foote. Great for R/C O. T. By Phil Bernhardt. snow car, .30 .40 engines. Fred Sanford. No. 3753 G ROOVY TUNA $2.50 No. 11743 "C-QUELL" $4.00 Price includes 3rd Class postage and reprint Top-notch Wakefield design from 1973- Class B/C power model, co-designed by of building instructions (if any). Add 454 MB's F/F Editor; 76" span. Bob Stalick. 1975 FAI U.S. team member. Jon Davis. PER PLAN for 1st Class postage. Add 504 for overseas orders (except APO's). No. 375-0.T. 1936 WAKE WINNER S2.00 No. 1174-0.T. LANZO STICK $3.50 Englishman Albert A. Judge's Wakefield Rubber stick winner. '40 Nats. Span 414'. Send self-addressed, stamped business size Cup design. Redrawn by Phil Bernhardt. Still good in Unlim. By Phil Bernhardt. envelope for free copy of complete plans list. No. 2751 TOP SLIDER $3.50 No. 910741 LONE EAGLE $2.00 CALIFORNIA RESIDENTS ADD 6% TAX. R/C Slope Racing glider. Will sport fly in High performance rubber scale model of light winds without ballast. Ken Willard. 1927 vintage monoplane. By Bob Oslan. SEND TO: MODEL BUILDER PLANS SERVICE No. 2752 CUT-LESS S2.50 No. 91074-O.T. BUHL PUP S4.50 Half-A R/C Pylon Racer for 2 ch. radio. Semi-scale 8 ft. span model published in 1105 SPURGEON. BOX 4336. Elevator and aileron. By Dave Katagiri. 1936 MAN. Redrawn by Phil Bernhardt. SANTA ANA, CALIFORNIA 92702 line up when the notches are cut out agree that it will be worth the slight As I have stated before, FLYING beforehand. I would just as soon do it amount of additional work. As soon as I SCALE is on an up-swing, and it is al­ after the keels are glued in position to finish the Messerschmitt, I plan to build ways good to hear when another scale assure accuracy. The center portion of the Hurricane next, and after that... club has gotten o ff to a good start. each bulkhead is now removed along I just received a letter from Don Srull There have been a couple o f new scale with the paper. If you leave the paper o f McLean, Virginia. It seems as though kits that have crossed my desk recently, on the balsa too long you will find that he and Hurst Bowers (Flyline Models) and by the time you read this they will it is not easily removed. Should this have been instrumental in starting a new be on your hobby shop’s shelves. Tern happen, you can use lighter fluid (nap­ scale club in their area. It is called the Aero has come out with two new kits for tha) and it will peel right off. Metropolitan Area Scale Society rubber scale. One is the venerable Aer- Each bulkhead is now mounted onto (MASS!). On March 2nd, they, along onca C-3 and the other is the perennial the jig. I use rubber cement to hold them with the D.C. Maxecuters, held a joint favorite, the Curtiss Robin. Each has a temporarily in place. Each bulkhead is indoor rubber scale contest. It was their wing span o f 18 inches, and they both aligned with the bottom notch on the second such venture (the first was a Pea­ follow the Tern type of construction. center line and the lower edge of the nut contest), and according to Don, it The kits are complete in every way, in­ side keel notches even with the top of was a huge success. They are fortunate in cluding prop, rubber, wheels and tissue. being able to use one o f the Navy trans­ each vertical piece. The top and side I have the Aeronca about half finished port hangars at Andrews Air Force Base, and it will be powered with a Brown keels are glued into place. Once these in Maryland. It was a little cold and draf­ have dried, all of the top stringers are C02- They are both welcome additions ty, but lots of room and a 50 foot ceiling to the growing list o f neat rubber scale also glued into their exact position. made for good flying. There were about models. After this unit has thoroughly dried, 30 models and over 50 spectators parti­ Another new product is being han­ it is removed from the jig. By using a cipating. dled by Peck-Polymers. It is Roger Tay­ single edge razor blade, the bulkheads There were separate events for mono­ lor’s Contest Rubber Lube. It is a full are easily removed from the holding jig. planes and biplanes. Mooney rules were 3 oz. in a handy dispensing bottle, and The lower half can now be completed. used for both static judging and flying. it does not contain any castor oil. Castor When finished, you will be pleased at Anything over 5 seconds was an official oil can often raise havoc with rubber, how straight and true every portion of flight; best of five officials was taken as so no problem here. It sells for only the fuselage is, and I think you will the flight score. $1.49 a bottle. ·

8 8 MODEL BUILDER IN THE BEST CIRCLES, IT’S fiber skiver

A PRECISION INSTRUMENT FOR THE DISCRIMINATING MODELER

• Safe, Rear D raw -Bar C lutch Available in seven anodized handle colors: • Precision, Instrum ent-Q uality M aterials silver, blue, red, green, gold, copper, violet. Complete set in fitted hardwood case; includes • Strong-H olding A dvanced C ollet D esign uber Skiver, together with two vials containing • N on-R olling H ex C ross-Section six No. 11, six N o. 15, one N o. 12, and one • D eeply K nurled, N on-Slip G rip No. 20 . . . A total of 14 blades Si 0.50 Individual handles (specify color) $3.95 • Long-Life, Stainless, Vial of 6 blades (No. 10, 11, 12, 15, Surgical Steel Blades or 20) S1.80 20 0 See your dealer, or order direct. Dealer inquiries are invited. MODEL BUILDER PRODUCTS All direct orders sent postpaid in U.S. California residents add 6% sales tax. 1105 Spurgeon, Box 4336, Santa Ana, California 92702 NEWEST IN BIPLANES

Designed by CLAUDE McCULLOUGH

WING SPAN: 51" AREA: 790 Sq. In. LENGTH: 41-1/2" ENGINES: .45 -.6 0

SKYBOLT FEATURES: Full-Length Formed Plastic Fuselage Top Molded Plastic Cowling And RC STUNT AND SPORT Wheel Pants VERSION OF LA MAR Molded Cockpit Trim Parts STEEN’S HOME-BUILT Strong Pre-Bent Aluminum SKYBOLT DESIGN. Landing Gear Formed Wire Cabane Struts Die-Cut Balsa Ribs With ’ Competition-Proven Performance Integral Jigs - Helps •Builds Fast-Simplified Assembly Procedure Assure True Alignment Die-Cut Plywood Parts •Rugged Construction-Strongest In Its Field Handy Printed Fuselage Sides •Choice Of Aileron Configuration Build Directly on the Wood Sig Quality Balsa and Plywood Single-For Sport Flying Colorful Decals Double-For Contest Work Large Full-Size Plan Illustrated Booklet *A Beauty For All Round Fun Flying • Photos of Full-Size Skybolts •Best Value On The Market HARDWARE PACKAGE: •Ideal For The New Biplane Stunt Event • Nylon Control Horns And Bellcranks Nylon Tail Wheel Bracket Nylon Wing Screws Molded Plastic Hinges Tuf-Steel R-C Links Aluminum Motor Mounts Blind Nuts, Screws and Other Small Hardware

KIT NO. RC-34

ONLY *49.95 f . . . Montezuma, torn 50171 Meet Our New A rrival

The new RS20 is exactly what you want a two channel radio to be. It comes in a very compact case featuring a unique open gimbal that is completely sealed from the internal electronics. Rechargeable batteries are provided for both the transmitter and receiver at no additional cost. Utilizing the RS4 sen/os with heavy duty gears in an all new configuration, the RS20 delivers the same high performance that other RS units are so well known for - small size, lightweight, equipped the right way, and performance. Four sound reasons why, when you check the price, it becomes the outstanding value for 1975.

$169.95 RS Systems Special Introductory Price 850 West Barkley Orange. California 92667 (714) 639-7261 Airborne Superiority

HISTORY OF SUCCESSFUL ENGINEERING Twenty six years ago, MRC started to manufacture electronic control equipment. The company's uncompromising quality standards have made it today’s largest diversified manufacturer of electronic oducts for the hobby industry. MRC grew because it made a better prc ct and MRC's Mark V and Mark VI radio systems typically stand heac ind shoulders above the systems they compete with.

Mark V—Five Channels

DEPENDABILITY . . . TESTED PERFORMANCE Proven dependability is a goal all RC systems seek but few achieve. MRC’s designs using state of the art American made integrated circuits rate high in perfor­ mance and dependability. Combine this with precision assembly and thorough testing, and it results in reliability the MRC user can depend on. Every Mark V and Mark VI is bench tested twice after final assembly and then actu­ ally ground range tested twice. The MRC system you get has passed a test procedure so far advanced and so confident are we of its reliability, that we provide a written full year guarantee for each MRC set.

SUPERIOR PRODUCT It has been more than a year now since the Mark V first came to market, and the frequency of service re­ quired is less than 20 percent of our previous models. The range of the Mark V and Mark VI is more than twice as great as our former set, and the servo resolution four times better. The new MRC systems offer range, reliability and precision control that exceeds many other so called sport systems and even challenge the higher priced ’’professional” sets. Ask your dealer. Ask the man who owns one. Fly a Mark V or Mark VI and enjoy MRC product superiority. Mark V—5 channels, complete with 4 servos, nickel cadmium batteries in receiver and transmitter and charger. Recommended retail under $300.... Mark VI—6 channels, features as above, and including field carrying case. Recommended retail under $ 3 2 5.... Mark V Special "2"—5 channels with 2 servos, nickel cadmium battery in receiver only. The set to grow with. Under $200 recommended retail. Mark VI—Six Channels Complete with case.

MODEL RECTIFIER CORPORATION · 2500 WOODBRIDGE AVENUE · EDISON, NEW JERSEY 08817