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H H B H H NEW! DUMAS DEEP VEES The new class that’s got class... a great new way to enjoy RC boating

Dumas Deep Vee 60's The three new Dumas Deep Vees are the fun point the way in Hennessy Cognac answer for the new RC model boater. They’re easy Miniature Grand Prix. to build, easy to drive ... and real easy riders when it comes to rough water. It's easy to see why they’re the fastest growing class with serious RC model boat competitors, too. In The First International Hennessy Cognac Minia­ ture Grand Prix, Dumas boats swept to victory with 1st Place Overall, 1-2-3 in .20, 2-3-4 in .40, 1-2 in .60 and the .60 Scale Award. Dumas Deep Vees are living up to their “for show or go" reputation. They win on speed, endur­ ance and realism.

Dumas Deep Vee 40 Dumas Deep Vee 60 Pit crews are kept busy at Miniature Grand Kit DV-40F S49.95 (glass) Kit DV-50 $39.95(wood) Prix with fixin*. fuelin’ and fun. Kit DV-20F $39.95 (glass) Kit DV-60F $59.95 (glass)

Be sure you’re ready for the coming season of deep vee racing including the big Hennessy Races d u m a s Dumas Products, Inc. now being scheduled. See your hobby shop right 790 South Park Avenue away and get your Dumas 20, 40 or 60. If he can’t Tucson, Arizona 85719 get your boat, write direct to Dumas, adding 10% boats for postage and handling. CARL I RETRACT POWER SYSTEM

At last! A way for 4-channel flyers to FOR 4-CHANNEL FLYERS! easily get into retracts! Our new Power System is ready to go - just add 2 penlite POWERFUL NEW SERVO, SPECIAL SWITCHING SYSTEM AND 2-CELL cells, mount the switch assembly on the BATTERY PACK-WIRED UP READY TO INSTALL. LIGHT! COMPACT! side of the fuselage or on the throttle servo, connect the retracts and that's it! When throttle and trim levers are both moved all the way up or all the way down, the retracts will do the same!

Heart of the system is a small, powerful servo, geared down for heavy work, and with thick strong output gears. Transit time under load is about 3 seconds. Easily handles tri-gear retracts with power in reserve. FLIGHT PROCEDURE 1. Take off using 3. On preparing to land, first bring trim to throttle stick fully advanced in normol System comes wired up with plug connec­ full retard. When ready, retard throttle monner. After take off, advance trim lever stick fully and hold for 3 seconds so gears tors and needs only batteries. 2 nickel to lim it, and geors w ill retract. cads may be used, or penlite dry cells w ill extend and lock. If necessary to odd throttle to lengthen approach, gears w ill which are good for many hundreds of re­ 2. Leaving trim at maximum, perform flight remain extended. tract cycles when using a balanced maneuvers as usual, retarding and advancing moin throttle stick os desired. Even with system such as C G Retracts. Complete system weight with full retard, gears w ill remain retracted. batteries (not furnished) - 3 oz.

'"®Y *SřV'OUIT IM ft multi-:-STRIPE

l>'S on Kit! When the foment modelers nomed obove tested DJ's Multi-Stripe end Itked t, the word go, „round. Now modele,s every­ where ore finding DJ s M ulti-Strip, fulfill. promises. „ ^ *£_ Th r f POin'· V"r ,hi"' “ i* o tpeciol expensiír- edhetive the tne „elproof bending ,okeS piece in sunlight There's no other top. hire „I No more shrinking, lifting, „„d ge9„ing di

Packard Photography oni „nd X - 7^7' °V°7d“'*r *» Joe Bridi and his new Super Kaos; a beautiful paint job topped off with DJ Multi-Stripe. Goldberg Nbd.1T------Exclus,vel>' by Carl 4 SIZES 1/16" Wide, 36 Feet Long - $1 .98 ΓCarl Pari GoldbergPrtlHhrtrrr ModelsMnrfnlr. Inc.I _ - 1 5 COLORS - RED, WHITE, 3/32" Wide, 36 Feet Long - 2.69 4736 W. Chicago Ave., Chicago, IL 60651 BLACK, GOLD, DARK BLUE 1/8" Wide, 36 Feet Long - 2.69 I am sending 25« lor 8 pg. Illustrated Cata- B / r " r U i R rCO? me.nda,ions in Starting in 1/4" Wide, 36 Feet Long - 3.69 .-S'o ?así Emanation of R/C Eouipment and Radio Control Definitions. Name____ Address_ CARL GOLDBERG MODELS INC C ity____ 4736 WEST CHICAGO AVENUE · CHICAGO. ILLINOIS 6 0 6 5 ^ State, - Z ip , THE CHOICE IS (almost)* OURS IN 1974 ♦ A statement in AMA's Monthly Mailing for August, In truth, the basic dues for Open membership is $10.00, 1973, is slightly misleading. It implies that a subscription but then you are required to make a mandatory choice to AAM, as part of 1974 dues for Open members, is only of paying $2.00 extra for AMA News, or paying $6.00 $4.00 extra. THIS IS NOT TRUE. The subscription is extra for AAM. In other words, you are obligated to pay actually $6.00 extra ... EXACTL Y THE SAME AS OUR at least $12.00 . . the other $4.00 is the difference to get SPECIAL CHRISTMAS OFFER TO AM A MEMBERS! the magazine, not the special subscription rate implied. NOW YOU CAN RENEW YOUR MEMBERSHIP WITH AMA (or join for the first time) AND RECEIVE A ONE YEAR SUBSCRIP­ TION to MODEL BUILDER (Starting with the January, 1974 issue) for the SPECIAL, LOW, CHRISTMAS SEASON RATE of $6.00, which is a 40% DISCOUNT off the new subscription rate. Remember, starting in 1974, Open AMA members are AND . . . "YOU AIN'T HEARD NUTHIN’ YET” . . . no longer required to take AAM as part of their dues. So, as a SPECIAL CHRISTMAS BONUS, new and renewing as a SPECIAL CHRISTMAS OFFER to ALL new and members may purchase additional subscriptions (as many renewing AMA members, MODEL BUILDER is making as you want) at the same special price (and until Jan. 14, this convenient package deal available. 1974) for friends on your Christmas list. How’s that for a good deal!? Use the extra address forms provided, and Simply fill out the form below ( If you are renewing, use please p rin t . . . some o f you write worse than doctors!! the form you arc receiving from AMA), and attach a check for the total amount required. That amount will Now then . . . ya say ya don’t want to Join or renew with be $6.00 plus whatever you have indicated on your AMA AMA? .. . come on now, ya really should . . . but, tell ya renewal form, or the one below. Send the whole ball of what we’re gonna do, just to show there’s no hard feel­ wax to us, NOT TO AMA. We’ll enter your subscription, ings. We’ll still give you a CHRISTMAS SPECIAL DEAL! or it you're already a subscriber (Bless you!), we'll add it Through Jan. 14, 1974, you may purchase your own and on to your existing one, and immediately forward your gilt subscriptions at 20% o il of the regular rate, or only membership form and payment on to AMA. Be sure you $8.00 each. Just fill out the form below, bypassing the mail it to us on or before January 14, 1974! added information required only for AMA membership. Paying dues through your AM A Chartered club? Include club Charter No. on form below, and enclose check for subscription only. I------[ ------

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APPLICATION-1974 AMA MEMBERSHIP AMA, c/o MODEL BUILDER, 1900 East Edinger, Santa Ana, California 92705

FOR THOSE 19 OR OVER BY JULY 1,1974 Open FOR THOSE NOT 19 BY JULY 1,1974 Includes all membership and competition privileges-and FILL IN DATE OF BIRTH Mo ______Day_ _Yr._ □ monthly AMA News (required) ...... S 12.00 □ JUNIOR OR SENIOR—No magazine ...... $ 3.00 G Add difference for A A M ...... 4 .0 0 □ Add for monthly AMA News (OPTIONAL)...... $ 2.00 □ Add extra for MODEL BUILDER ...... 6 .0 0 □ Add extra for MODEL BUILDER ...... 6.0 0 □ A dd extra fo r A A M ...... 6.00 T O T A L S ...... T O T A L $ ......

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1973

volume 3, number 25 Restored by R. Friestad - 2008 - www.fullsizeplans.com ------Γ

S T A F F I CONTENTS I EDITOR FEATURES Wm. C. Northrop, |r. WORKBENCH, Bill Northrop...... 4 GENERAL MANAGER Anita Northrop OVER THE COUNTER, Bill Northrop...... 5

EDITORIAL ASSISTANT PRODUCTS IN USE, Jimmy Lee Jones...... 6 LeGray PRODUCTS IN USE, Bill Northrop...... 7 ART DIRECTOR Paul Plccan | R/C SOARING, Le Gray...... 12 S E C R E TA R Y CHOPPER CHATTER, John Tucker...... 14 A. Blackburn RADIO CONTROL REPORT, Frank Schwartz...... 16 SUBSCRIPTION MANAGER A. Valcarsel R/C WORLD PATTERN CHAMPIONSHIPS, RCM&E...... 20

R/C PYLON, Tom Christopher...... 24 CONTRIBUTORS F/F SCALE, Fernando Ramos...... 26 Tom Christopher HANNAN’S HANGAR, Bill Hannan...... 34 Chuck Hallum Bill Hannan I FREE FLIGHT, Jean Andrews...... 38 Dale Kirn i NFFS NEWS...... 41 Walt Mooney | PLUG SPARKS, John Pond...... 45 John Pond i Fernando Ramos , CONTROL LINE, Dale K irn ...... 48 Frank Schwart/ John Tucker SCALE VIEWS DOUGLAS 0-25C, Peter Westburg...... 29 Franny Woll j

ADVERTISING REPRESENTATIVES [ CONSTRUCTION EAST Auke Venema, 79 Adirondack Ave I QUASOAR II, Niel Liptak...... 8 Spotswood, N.J 08884 (2011 251 2860 I OC TAGON, Ted Maciag...... 19 WEST 8ob Upton, 20626 Clarendon Ave. ! PEANUT SPEED SPITFI RE, Walt Mooney...... 35 Woodland Hills, California, 91364 (213)883 7681 [ PULL-Q, Jean Andrews...... 42

Subscriptions $10.00 per year, $17.00 two | INDOOR CABIN RECORD HOLDER, Ai Rohrbaugh...... 44 years. Single copies $1.00. Add $2.00 for i postage per year outside of U.S. (Except ' REPLICA .020 INTERCEPTER O.T., Wayne Cain & John Pond...... 47 APO). Add $0.75 for Canada and Mexico. I

Copyright 1973 The MODEL BUILDER All rights reserved Reproductions without per­ mission prohibited. Cover: A beautiful Illinois sod farm provides the background for our cover photograph of Niel Liptak and his Quasoar II, the subject of this month’s feature construct­ Published Monthly by The MODEL BUILD- | ion article. Niel's 12 foot span, V-tail R/C sailplane is built on a iberglass fuse­ ER Magazine. 1900 East Edinger Ave., Santa . lage (available from Hartman Fiberglass R/C), has a 3-piece sheet balsa covered Ana. California 92705. Phone (714) 547 3963 I ing, and is equipped with spoile s and air brakes. I Second Class postage paid at Santa Ana. Ca

DECEMBER 1973 3 We'd like you to meet John Tucker, editor of "Chopper Chatter," our new column on R/C helicopters. See "W orkbench" for more info. This pic taken in Guadalajara, where John was demonstrating his Kavan Jet Ranger to Mexican R/Cers. German Veco, Orbit radio, 11 pounds.

/ ‘r o m B i t i / i I V o r k b e n c h · · ·

THAT AMA/MB OFFER )ohn started modeling in the early sociatcd with PSA, where he was a cap­ It seems we overlooked an important th irty ’s in Ottumwa, Iowa, and still tain for 13 years. Seven years ago, he point in our combination subscription remembers a young guy from Comet joined Air-California. As you can well deal with AMA memberships. There are Model Company who stopped by the imagine, his stories could fill a book . . . hundreds o f AMA Charter clubs model shop he had opened in his uncle’s and it would never get dull! throughout the country, and many of furniture store to help him select and As for modeling, John never really them handle membership renewal of order materials . . . Carl Goldberg! gave it up, and in recent years, owned club members through the club officers In 1937, |ohn entered his Megow a hobby shop in San Diego, where he in order to be sure of 100% AMA mem­ Quaker Flash in a contest, crashed, now resides. He has been in R/C since bership within the club. repaired the ship, and went on to win the raw beginning, built and flew Walt Bob VVargo o f Parma, Ohio brought 1st place. The prize was a free flying Good’s famous TTPW system and has this to our attention, and wanted to lesson! On that first lesson, in a Taylor been an Orbit radio operator since the know how he could take advantage of Cub, the owner/instructor spotted a earliest single and reed sets built by our offer while renewing with AMA natural flyer, and soon had John shoot­ O rbit’s founder, Bob Dunham. through his club. Two ways to handle ing landings! Naturally, he completed John has been building and flying it, Bob: First, if club officers are willing, his lessons, became a pilot, and went to R/C helicopters since he first saw Dieter have them send us a list of names and work for the instructor at his airport. Continued on page 70 addresses o f club members who want After finishing college, John came an MB subscription, include the club back to the airport and took over its Charter Number, and o f course, attach operation for the owner, who went to a check amounting to $6.00 times the train pilots for the coming of WW II. number of names on the list. Second, With the coming of the fracas at Pearl if club officers prefer that you handle Harbor, John first became a troop glider it yourself, just send us your subscrip­ pilot trainer, and then was sent to tion order individually and include Kelly Field, where he taught U.S. your AMA number and club Charter Cadets, ATC, Chinese Cadets, and number. WASP . . . Woman’s Auxiliary Service ASK A SILLY QUESTION . . . Pilots (he married one!). This month we have launched a new Seeking a little more action, John feature department in MODEL BUILD­ signed up with Claire Chennault’s China ER, “ Chopper Chatter,” and with it, we National Aviation Corps, and as a mem­ are the first all-modeling magazine in ber of the Flying Tigers, flew C-46s and this country to give this fast-rising C-47s over “ The flum p” for two years. (no pun intended . . . much!) facet of Following the war, and a short spell the R/C hobby a permanent place o f its at operating a flight school, John be­ own. Heading up this new department came executive pilot for the Mayor of is a gentleman by the name of John Brownsville, Texas (The potato king of Tucker. America) and was head of the Mayor’s While talking over plans for the fleet o f 6 Noorduyn Norseman aircraft. format o f our new helicopter section Being a good friend o f Lyndon Johnson, with )ohn, the thought occurred that the Mayor often had John fly both o f we should introduce him to the model­ them, along with others, on hunting ing public by including a bit o f his aero­ parties into Mexico. He says some of nautical background. The fact that he is the late-night poker games were unbe­ currently Director of Operations and lievable, with the stakes reaching astro­ Chief Pilot for Air-California led us to nomical sums. In one game, the Mayor’s suspect that there might be an interest­ complete airline; Noorduyn Norsemen, The little guy on the right, holding an AT-6, ing story, but WOW . . . what a Pan­ John Tucker, and all, were in the pot! is our Mystery Modeler for December. Photo dora’s Box we opened! From Brownsville, John became as- was taken in 1939. Know who it is?

4 MODEL BUILDER OVER THE COUNTER

• Orbit Electronics has joined the packaged R/C accessory field with sev­ eral new products. Nylon wing bolts, 1/4 X 20 size, have a full size slot with a protective ring which prevents the screwdriver from slipping out and punching a large hole in the finish. Polypropylene hinges have 6 pre­ drilled holes in each leaf which help to lock them in place when installed with epoxy. Finally, Orbit offers an entirely new item which should become extremely popular with R/C’ers. Called a servo Fliteglas Models' new Cessna O-IE Bird-Dog is a combination stand-off scale and trainer. Has fiberglass fuse in olive-drab gel coat and foam wings precovered w ith 1/16 balsa. S49.95. link, it is attached to the servo output arm or wheel. A 1/16 inch wire pushrod end is merely slipped into a hole on the link, adjusted for center and proper travel, and locked in place with an Allen-head set screw . . . No more 90 degree or “ Z ” bends, hold-on clamps, or turning clevises in inaccessible loca­ tions. * * * Fliteglas Models, P.O. Box 98851, Des Moines, Washington 98188, has a new .15 to .30 powered R/C trainer Czech MVVS diesel and glow .15s engines are Swiss music box works are basis for this timer that is also a stand-off scale Cessna being imported by Colony Enterprises. built by Ray Monks. A Colony import item. O-IE Bird-Dog. For 3-channel radio, the Bird-Dog is a complete, semi-finished Colony Enterprises, 2337 Ewing St., cents postage) the A/2 $20.00 (plus 75 kit, including; fiberglass fuselage in Los Angeles, California 90039, is a new cents postage). olive drab gel-coat with motor mounts, company that is specializing in the Colony also offers timers designed bulkhead, and landing gear block pre­ importing o f various competition free- and assembled by Ray Monks. Units are installed, and foam wings precovered flight items from overseas. First offer­ built around Swiss music-box works and in 1/16 sheet balsa. ings include kits for two Nordic A / I ’s are light and dependable. Unfortunately, The Bird-Dog is a kitchen table type designed by England’s jim Baguley . . . the music portion has been removed, so construction job, needing a minimum of the Asteroid and the Satellite (the latter your ship will not climb toward the tools. Building consists o f joining the is no relation to Bill Flunter’s bird . . . heavens to the tinkling tunes, ” O ff We wing halves, attaching tail surfaces, in­ except for flying reputation). Also avail­ Go . . . ," or “ The High and The stalling engine, and equipping with radio. able is a 78 inch span A/2 Nordic, the M ighty!” Units are priced at $20 plus Span is 52 inches, price $49.95. Nova. The A /1 ’s cost $7.00 (plus 50 50 cents postage. Continued on page 71

First of series of new accessory items being marketed by Orbit Electronics. Servo link really simplifies matters.

DECEMBER 1973 5 tirely of 1/16 inch plywood and is of the pod and boom design. This may turn some of the scale sailplane buffs off, but the design is clean and quite pretty in the air. It is very light, immensely strong, and easy to build due to Frank’s engineering and well-detailed plans. The fuselage is intended to be used with wings from 88 through 130 inch span without any change in rudder or elevator area. Mark constructed the 110 inch wing in this instance and it turned out to be a perfect combination for thermal or light slope lift flying. The boom is constructed of 1/4 inch square spruce and 1/16 inch plywood with Golden Rods or Nyrods run through the boom to operate the con­ trol surfaces, which are o f conventional construction. Any o f the small servo or brick radio systems will fit in the pod with room to spare. Mark Jones wasn't long in picking up a trophy w ith his 110 inch version of Frank Zaic's new The wing airfoil is a flat bottomed R/C "Floater.” Great to see the JASCO name back w ith us again. Ship features all ply fuselage. 6409 and penetrates well, with almost the same lift as the undercambered version. The spars are solid spruce and exhibit amazing flexibility. The general PRODUCTS IN USE construction is identical to Frank’s earlier G-99 and Thermic 100 wing kits, The JASCO "FLO ATER,” R/C SAILPLANE. but is faster in that the main spars are By Jimmy Lee Jones. not constructed o f balsa and spruce laminations. • The fact that my fourteen year old I constructed, nor the last, but the Don’t worry about high wing flex on son, Mark, and I are avid R/C Sailplane thing I have never forgotten is that strong launches . . . these wings will enthusiasts is well known to anyone Frank’s ships always flew and were take it!! Also, they are not short on visiting the Dallas-Fort Worth area. My second to none in engineering. Frank’s performance as they enabled me to com­ love for this phase of modeling dates latest R/C Sailplane kit, “ The Floater plete my LSF level IV requirements back to 1951 when I lost a (asco Ther­ 110," is no exception. with a 71 minute thermal flight on a less mic “ C” towline glider in a thermal. Frank mailed the prototype kit to than ideal day. This was my first "rising air” exper­ me this summer and, due to pressing PS: Mark won first place today in a ience and the little Thermic “ C” disap­ business obligations, I asked Mark to local fifteen minute precision-duration pearing directly overhead after a 21 build the kit. He had absolutely no event (Task 11 A) with a perfect score of minute flight was a thrill I shall never difficulty building the ship and it flew 1200 points, so we can also recommend forget. “ right off the board.” the Floater 110 as a good competition This was not the first Frank Zaic kit The fuselage is constructed almost en­ sailplane. ·

JASCO "Floater" kit includes parts for building 88, 99, or 110 inch wing. Spruce spars are rugged, yet allow flexibility. Light tail surfaces help to avoid carrying dead load ballast in nose. Boom is 1/4 inch spruce w ith 1/16 ply sides.

6 MODEL BUILDER • With the introduction of its GDA- 1057 series of kits early this year, the Heath Company entered the highly com­ petitive economy priced market for radio control systems. The GDA-1057, as a 3 channel system, complete with transmitter, receiver, two standard ser­ vos, and rechargeable nickel-cadmium packs for both Tx and Rx, sells for only $139.95. From this low, get-your-foot- in-the-door price, the purchaser has several options which permit him to expand the system to 4 channels, and/or to use miniature or sub-miniature ser­ vos. At the time o f purchase, or whenever the builder wishes, a 4th channel con­ version kit (GDA-1057-4) may be ob­ tained for $19.95. The major compon­ ents in this kit are parts to convert the single transmitter stick from 2-axis to 3-axis. The rest of it consists of a few odd transistors, capacitors, and resis­ tors which are soldered into existing vacant holes on the Tx and Rx encoder and decoder circuit boards. The only other step-up from the basic price of the GDA-1057 is in the servos. For an additional $10.00 ($149.95), the system may be pur­ Completed Heath GDA-1057 test rig on 53.3 MHz. Transmitter design is great for left handed chased with two miniature (GDA-405- R/Cers. and w ith hand strap, is particularly easy to hold while hand-launcing aircraft. 44) or two sub-miniature (GDA-505-44) servos. A ll servos are Kraft mechanics (cases, gears, pins, output shafts, and PRODUCTS IN USE output arms or wheels) while the elec­ tronics are by Heath Company. The HEATH COMPANY GDA-1057 R/C SYSTEM. miniature corresponds to the Kraft By Bill Northrop. KPS-11, the sub-miniature to the KPS- 12 and the standard to the earlier and help with any problems that may devel­ in many items connected with today’s somewhat larger KPS-10. The Heath op during or after construction. everyday life, so the initial image of servos sell separately for $24.95 (mini Having known about the Heath Com­ radios and related test equipment in kit and sub-mini) and $19.95 (standard). pany since almost the beginning o f its form hardly begins to cover the scope Incidentally, all -prices mentioned existence in the electronic kit field, it is of items available from Heath. There above are factory catalog list, to which easy for us to overlook the fact that are color and black-and-white TV sets; shipping charges are added. Radios may some readers may not realize what's stereo, FM, AM, short wave receivers also be purchased through Heath Com­ behind the name “ Heathkit.” A com­ and amplifiers; electric organs; tape and pany outlet stores located in major plete story on the Heath Company was record players; garage door operators; cities throughout the country. Prices in published in the July, I973 issue of depth sounders; radar ovens; automobile the stores are slightly higher than those MODEL BUILDER, but sulfice it here testing equipment; guitar amplifiers; in­ in the catalog, on all items. The outlet to say that this is the largest producer tercoms; burglar alarms; and a complete stores also have repair and service de­ of top quality electronic kits . . . pro­ line of ham radio equipment. The com- partments where trained technicians bably in the world. Electronics appear Continued on page 56

Servos are double-stick taped to sides of SW Sailplanes' Baby Bowlus. Servos (Kraft KPS-12 mechanics) fit in Orbit PS-4 tray! Shown here Switch is wedged in foam. Blurred "H eathkit" due to 2 servo tapes. in editor's old "Square Hare" design. Veco 19 power, all sheet const.

DECEMBER 1973 7 QUASOAR H By IS1IEL LIPTAK A high performance, new generation sailplane, featuring all sheet balsa covered wings, all flying ruddervators, spoilers, air brakes, and retracting wheel. Fiberglass fuselage available, or build up your own.

• Ah . . . the fact that you have gotten Well, you’ve made it through Phase quickly becomes the middle. to the text portion of the Quasoar l l ’s One. All checked into the motel nearest Now you get down to business. The article illustrates two things: Number the contest site. The eerie red glow of interrogation begins; first your name one, you have very good literary taste your battery charger, pumping up your and address, the registrar asks frequency, based on a very well educated design radio system for tomorrow’s conquest, A.M.A. number and F.C.C. number . .. eye. And second, you are giving some creates an enlarged silhouette o f the and then to name the sailplane . . . to thought to building a Quasoar II. Let’s, Quasoar ll's fuselage. A few quick men­ which you reply at the top of your for the moment, investigate further what tal measurements o f the silhouette and voice, “ Quasoar II!” you would encounter once you con­ you realize that the span for your Now to the hard part . . . wing span structed a Quasoar II. brainstorm would be in the neighbor­ and wing loading. Let’s see . . . 16 oz. First of all, you would discover that hood o f 38 feet in full scale. to the pound divided by wing-span . . . constructing long thin wings isn’t as Oh, one more thing before you shove or is that area, or maybe the square hard as you’ve been told it was. And o ff to dreamland, and that is, what root o f the elevator area? also, you would discover that there is time to wake up. Let’s see . . . the con­ Now that the registration is out of something about soaring that is hard to test starts at 9:00 a.m., registration isat the way, you can retire to the pit area describe, but involves the same challenge 8:00 a.m., and with breakfast and a ll.. . and assemble your machine. This is as flying a perfect pattern or turning a how about a wake-up call for 4:30 a.m., where the real fun begins. As you boll 1:20 in pylon. just to be on the safe side? After all, the wing on, a spectator’s eye is caught After you have mastered the tech­ you’re not nervous, and you can use by your prowess in assembling your niques o f soaring with your Quasoar II, the extra time to watch the Sermonet craft. He stops to engage in sincere you decide to enter your first soaring before you go to breakfast. conversation. After all, he too has an contest. It seems that most contests You finally get to the field. So what unending quest for knowledge. His first are at least a 5 hour drive from any­ if you are the first one there; the C.D. is question is, "How do you get those where, so you carefully outline a check­ always looking for someone to help set things up?” To that you desperately list. This is because if you forget those up the winches. The registration line is search for one sentence to describe a precious wing wires, you’d never make starting to form, so you insert your Hi-Start, winch and hand tow. it back before the awards are passed out. body at the end o f the line . . . which Now the contest is about to begin.. .

Author/designer/cover boy Niel Liptak hooks The Quasoar breaks down (intentionally) to Honda car size pieces. Three piece wing allows for up the Quasoar's flying V-tail. Uses Todi link. rugged center-section construction. Good way to go on 12 foot and greater spans.

8 MODEL BUILDER What a flying site! A little easier to get, too. when you don't threaten to disrupt the peace and All-moving ruddervators plug into sturdy, quiet w ith engines. Beautiful lines of the Quasoar show up well in this photo. 5/32 pivot rods. No slop a necessity! tunate, who struggled for a 3 min. and 12 second flight. Ah, but one perfect flight won’t win you a contest. You need 2 more, count ’em. On your next attempt you launch into a boomer, so getting a max is no sweat. But on your third flight, that sinking spell hits you again. Now you know what it ’s like to be the Captain of the Titanic, you’ll take anything. As a last attempt to stay aloft, you try to pick up some slope lift o ff of a discarded pack o f cigarettes. You barely clear that barbed wire fence on the way to You were probably already thinking about this! Given a good, strong slope wind, leave off the the spot but you make it, not a max, outer panels and change the name to Quaspeed! but not loo bad. It should keep you in but not before the p ilo t’s brief. This is You realize that to stay up for 10 the top 50 anyway. where all pilots gather around the C.D. minutes, lift is going to play a very Your flights are over. Now to the and discuss the weather, size of the vital role so with this in mind, you awards. The presentation starts at third landing zone, and the rotten breakfast start the search. place, then to second place, and finally they had that just may effect their No lift and about 9 minutes to go, to first place. That’s you, you’ve done second round of flying. The brief your altitude is less than 100 feet, but it! You won first place! Boy, will the breaks up and you head back over to the wait! What was that? A wingtip moved. guys at work be proud o f you. Just pit area. You almost get back to your You start to circle. Perspiration slowly don’t tell them you traveled 300 miles lawn chair when your name is blurted trickles down your forehead. Each cir­ each way and spent about half a week's over the P.A. system. Oh no! This is it! cle you ascend a few more inches. wages just to participate in group ther­ Your palms begin to sweat as you get Finally, you hear your timer say 8:30, apy for a bunch o f toy airplane nuts. your transmitter out of impound and a tingle of accomplishment races down After all, they never tell you about find a timer. Before you know it, your your spine as you prepare to descend their gold ball budget! Quasoar II is firm ly attached to the tow- upon the landing zone. Final looks Well, there you have it. Maybe a little line and you’re on your way to your good, and 10 seconds to go, 5 seconds, distorted in spots, but an idea o f what first official contest flight of your 3, 2, I as the spot comes up to caress the ole contest circuit is like. Flope you career. As the ring gracefully slides o ff the bottom of your Quasoar’s fuselage. enjoyed it; now down to the serious the towhook, you nervously mutter A perfect score, you’re ecstatic with stuff. "time.” To that command, the distinc­ excitement. You skip tra la, tra la . . . FUSELAGE tive click o f the stop watch is clearly into the spot to retrieve your ship be­ The fuselage, as you can see, is o f recognized. fore it falls prey to some poor unfor­ fiberglass. This is available from Hart­ man Fiberglass R/C, Argenta, III. 62501, for a price of $20.00. A very high quality of workmanship is displayed in all Hartman products, so I'm sure you won’t be disappointed with the fuselage. The fuselage comes in two halves and must be joined together. This is no major task, but requires the use o f fiber­ glass tape (furnished) and resin. First o f all, using masking tape, fasten the two halves together about every two inches or so around the entire circumference of the seam. Now mix some resin, about an ounce should be more than enough, Spoilers and air brakes extended. VerY useful control, once you get on to the knack of using it. They're made of stock K & S brass strips, direct from the hobby shop. Note retract wheel.

DECEMBER 1973 9 tape and apply it over the portion just While the resin is setting up, sight You now need to lay fiberglass tape resined, then do the segment previously down the scam and check to see if it’s over the inside seam. If not already covered by the tape. Continue this pro- straight and true. If not, twist the fuse- done, cut out the wing section o f the

How's this for accessibility? Servos are mounted on a slide. Todi Goldberg nose gear retract unit is adapted for single wheel operation. "M ixer" is in rear compartment. Hartman Fiberglass fuselage. For spot landing events, retract gear, put on double-stick tape skid!

10 MODEL BUILDER = lBRtGl->.Vh F U B tU A .æ ■ » AvVK»l_*Bl_E FROM . ΜΑΛΤΝΛ^Ν FIBR£GCAAS R/C. tie MlLROtt SÍT M*ůtNT»., IU. WV5I QUASOAR Π Lf NtU 1'fUí

Note: Full size plans w ill have some further revisions and additions that were being made FULL SIZE PLANS AVAILABLE - SEE PAGE 72 while this issue was going to press. fuselage in order to attain access to the used too much, since it does require a ribs is next. Remember, this is the entire inside of the fuselage. Now cut a length smooth field to insure against damage. half we are building. When you get to o f tape that will reach the entire length But it looks neat and satisfies my weird the joint half way out the panel, insert o f the bottom and lay it over the seam. taste. the brass tube. Insert the tubes full Now mix up some resin and pour it over WING length and cut them in half after the the seam, tilting the fuselage so the Ah yes . . . the wing, a very vital ribs have dried. By using this method, resin saturates the entire length o f tape. unit o f the soaring bird. First of all, you insure that the tip panel will line Repeat this process on the top seam make the ribs as shown on the plans. up perfectly with the center section. after bottom has dried. Insert right angle You will have to go through this rib Before the top sheeting is glued wire for butterfly tail pivot and mount making process twice . . . once for each down, install all linkage for the spoiler/ securely. half. Even though the wing is in three air brake. Also insert the spoiler back-up The bulkheads are installed after the pieces, it is built one half at a time. sheet as shown on plans. Oh yes, a wing is complete. That way you can Here is how it’s done: word about the washout. You can go custom fit the wing to its mounting. Lay the bottom sheeting out for the right ahead and build the tip panels on More on that later. entire wing half. Glue the bottom spar a flat board. Just before gluing on the The retractible wheel, shown as an to the sheeting and cut out the air brake top sheet, slide the washout shim into option on the plans, was incorporated opening. Now lay the 3/32 balsa sheet place. After the top sheeting has dried, in the prototype. However, it is not over the air brake slot. Placement of the Continued on page 65

DECEMBER 1973 11 Rea

L

FORCE ARRANGEMENT

b w ing span M« stabilizer moment (tail moment) Sr rudder area CG center of gravity Rea rudder average chord St stabilizer area CRu rudder volume coefficient Ref refe ren ce Wca wing average chord CTu tail volume coefficient S w in g area W cr wing root chord F. stabilizer force Sea stabilizer average chord W et wing tip chord L center of lift Scr stabilizer chord Wi wing angle of incidence M r rudder moment Si stabilizer angle of incidence AR aspect ratio R/c SOARING R/C sailplane design for amateur brain surgeons . . . or, how to design an R/C sailplane in 5,000 words or more . . . or, original sailplane designs are many splintered things . . . or, (thank Heavens, no more room!)

• It’s a fact. R/C soaring is enjoying created.” Some quiet guys are smart, have the picture or not. one of the most phenomenal rates of too . . . Honest. Very few first designs will be world growth of any sport since that bit with So what does it take to be a designer beaters. Maybe even none. Might even the apple some years back. But growth of R/C sailplanes? Some clown might be a dog or two in the lot. The impor­ per se isn’t necessarily good. answer “ an ovcractivc ego.” Ignore him. tant thing is that if it’s yours, it’s yours Growth means people . . . means What it really takes is desire . . . and . . . pride and joy. Who ever heard of a money . . . means commercial interest. that’s probably the most important mother who had an ugly child? Well, as That's good. But as a result, there arc factor. Now just why such desire exists a matter o f fact, I know one guy back so many excellent sailplane kits now can be a very personal thing. It might in Texas . . . but that’s another story. available . . . and more coming . .. that even be in the interest o f science. Who Most any sportsman who has success­ incentive to produce original designs is cares as long as it provides a personal fully built and flown two or three kit dwindling. That’s bad. Oh, there's junk satisfaction? sailplanes, has completed third-grade on the shelves, too, but the point is that Other than desire, sailplane design calculus, and spends a lot o f time in the good kits are available for many con­ takes a little bit of talent with pencil library staring at magazine plans, has figurations, sizes and prices. and paper, but hardly beyond the dood­ enough basics to step up to the chal­ So why spend the bother, time and ling level. Professional quality, engineer­ lenge. The one essential element is an energy to create another sailplane? Be­ ing drawings aren’t required. adequate command of the English lan­ cause new, imaginative designs are need­ How about a knowledge of aerodyna­ guage so as to convincingly provide all ed to maintain the vitality, growth and mic theory . . . higher math . . . all that sorts o f esoteric reasons for various advancement of the sport. stuff? It can add to the fun, if you en­ design features . . . or mistakes. The Most advances in the R/C sailplane joy it. Certainly scientific concepts more esoterica the better. If just a hint art come from individuals. Just a few should not be ignored. The serious R/C of accent can be developed in the pro­ active guyscan design, build and develop sailplane designer will consider and nunciation o f scientific terms, so much more good sailplanes in one flying sea­ evaluate every piece o f data and ration­ the better. German is particularly po­ son than the world’s manufacturers can al theory available to him. But, if you tent. Italian is next. British is passe. tool, kit and market in several years. are not so inclined . . . perhaps prefer- Always remember that very few souls It would be a real shame if individual ing action to analysis . . . you needn't w ill argue with authoritative sounds. design talent were lost due to the avail­ wallow in EBS (“ E” for esoteric, the Validity be damned. To be adequate, a ability of good kits or good magazine rest is up to you). As a very wise man designer’s verbal diatribe must be con­ designs. once said, “ There’s something fascinat­ fusing and preferably unintelligible. Chances are that most R/C soaring ing about science. One gets such whole­ So, the first step in “ Sailplane De­ sportsmen hanker to create at one time sale returns of conjecture out of such a sign for Fun and Profit” is to develop or another. And well they should. It's trilling investment of fact.” the language barrier. Secondly, a piece an expression of the inner-man . . . a There’s plenty of time to get smart. of tracing paper is needed. This is used three-dimensional art form. There’s a Ya can’t tell, the technical approach to lay over plans o f an existing design lot o f untapped talent standing around might become your thing. Later. Don’t . . . and trace. It ’s quick, too. Lots of the field, and not all of it is mazda- sweat it. The sailplane will understand successful designers anxiously await each mouthing accounts o f “ how great am I” and react appropriately to all laws of new issue o f the various model maga­ or “ how great is that which I have aerodynamics and physics whether you zines to see what they’re going to design

12 MODEL BUILDER next. Actually, there’s little reason to not utilize the force arrangement o f a proven configuration if you’re so in­ clined. Whatever example you choose to follow probably isn’t unique anyhow. Besides, it’s most expeditious . . . and it's your magazine. Note how casually the term "force arrangement” was dropped into the pre­ ceding paragraph. Sounds real neat, but actually it’s just a little of that EBS jazz that means "all parts in their places.” There are three primary elements to be considered in the fuselage sideview . . . or rather, there is a triad of inter­ dependent aerodynamic and/or mass balance parameters which are critical to pitch stability (Really! wen). These are center of lift (L), center of gravity (CG), and stabilizer force (Fs).Get these Dr. Walt Good (rt.) seems to have blended well into the German scenery during his stay there. In this photo by Helmuth Lohman, he talks to Harald Neckar, who is W. German aerobatic R/C three things arranged properly, with sailplane champ. Neckar is also top pattern pilot. See R/C W/C report on page 20. appropriate relative values, and you’re on your way as a designer. purposes, this could hardly be easier. It ops, the Ms will probably shift . . . oh, If you decide to wing-it and to not sets right on, or immediately above the let’s hurry right by that one . . . but for copy Harley Michaelis’ latest beauty, a CG. now, the two-thirds o f overall length is a more careful review of these three ele­ It should be noted that what is dis­ good start point. By indicating Fs at ments might be in order. So, spread out cussed as CG and L . . . with locations Ms distance from the CG, it helps the your tracing paper, and lay out (draw) on the reference line . . . are not true designer remember which end the tail a longitudinal reference (ref) line. Now positions. Or at least are not necessarily goes on . . . And that it does go on. this is simply a straight line running true positions. Only by the strangest Incidentally, stabilizer force (Fs) is across the paper from left to right or coincidence would either or both of assumed to act at the 25 per cent point from right to left depending upon these elements actually fall on the ref o f stabilizer average chord. whether you’re in the Northern or line. But we don’t care right now. We’re Next, some math . . . Well, ya can’t Southern hemisphere. The ref line is only interested in their relative horizon­ expect to avoid all the heady stuff if sometimes called a “ center line,” but tal positions, and not their vertical you get involved in a technical field. A usually isn't, or even a "thrust line,” displacement above or below an arbi­ computer will help . . . a slide rule is which is obviously incorrect . . . or you trary line. So, to keep things relaxed, nice. Otherwise, lind a 12-year old kid got in the wrong classroom. If you we’ll use the notations CG and L just who has had "twelves” and can do long really want to make like a professional, as if we knew what we were doing. division. Wing area (S) and average wing don’t draw the ref line a solid (------), Gotta keep that EBS factor up. (In chord (Wca) must be calculated. or as a center line (------), but break this application, it's the Balance Point Wing span (b) is at the designer's it every six or eight inches with two . . . not the CG . . . hut Center o f discretion . . . depending on what he can load into his wife’s second car. Or short dashes ( ------). Gravity has more EBS appeal, wen) Unless you’re devoted to sub-minia­ Another thing. For simplicity, as­ some other scientific reason. Ask your ture sailplanes, the ref line oughta be sume that the center o f lift (L) occurs 12-year old Math Major how to figure about 48 inches, give or take. The fuse­ at the 25 per cent point of average wing area and he’ll probably smart back with lage length on a conventional design chord (Wca). Note that this “ average some Mickey Mouse answer such as will usually be about 35 to 50 per cent chord” is not necessarily the “ root "height times w idth.” Since he’s not o f wing span, with the larger spans chord,” which is the section shown in an aerodynamicist, he won’t understand carrying relatively shorter fuselages. At fuselage side-view plans. that his schoolboy arithmetic is inade­ this point, you won’t know the exact Now comes location o f the horizon­ quate. What is needed is a formula that length that the fuselage will be unless tal stabilizer . . . which includes the considers wing span (b) and average wing you’re designing to a specific envelope fixed stabilizer and the movable eleva­ chord (Wca). (dimension). Make all your layout lines tor. Again, we’re only interested in For a non-tapered wing, the answer fairly light so they can be changed horizontal position for the develop­ is obvious. Whatever wing chord you around as needed. ment o f our force arrangement . . . or got is average. For a straight-taper wing, Now that the ref line is set, indicate our “ force model” if you want to zap the Wca length is going to be mid-way a CG position by drawing a ® on the an Old Flying Buddy with fancy words. between the wing chord root (Wcr) ref line at about a third of its length in Indicate stabilizer force (Fs) . . . a short length and the wing chord tip (Wet) from the left end. That is, put the CG arrow pointing vertically will be fine ... length, and it’s going to happen half­ at about one-third of what may become over towards the right side of the paper. way out on the semi-span (wing half). the overall nose-to-tail dimension. The The Fs should be about twice the dis­ Mathematically, this can be written: nose always goes to the left side of the tance from the CG as is the nose . . . Wca = (Wcr + Wcl)/2. If you specify a paper. Professionalism. that is, the other two-thirds of the wing plan form other than no taper or The force skeleton now consists of a approximate overall nose-to-tail dimen­ straight taper, you’re a smart-alec and ref line and an arbitrary CG position. sion. This distance . . . from CG (or L) can figure your own Wca! Next step is to indicate the center of to Fs . . . is referred to as the horizontal For talking purposes, assume that the lift (L). Now really, we’re not interested stabilizer moment arm or, simply, tail design under consideration to be a in the actual center of lift. All we care moment, and is noted as Ms. And that, straight taper wing of 10-foot (120-in.) about is the point where the lift compo­ Fred, must be where the women’s lib span, with a Wcr o f 10-in. and a Wet o f nent intersects the horizontal ref line movement got the Ms bit. S’pose? As 6-in. The Wca is (10 + 6)/2 = 8 inches. under level flight conditions. For design the design layout or force model devel­ Continued on page 50

DECEMBER 1973 13 John Tucker's Kalt Huey Cobra equipped w ith Model Helicopters new floats, hovers over the water at Mission Bay, San Diego, California.

The opener of a new department completely dedicated to model helicopters. This column to be the focal point for new items and kits, hints and kinks, activity reports, and whatever. Join the fun!

• At the local R/C Hying site, you can Since that lime, manufacturers have ing your “ b ird " and then discover it’s see novice and expert alike, doing their produced several excellent R/C helicop­ a little (?) difficult to fly. And that special “ thing" . . . Pylon racing, Pre­ ter kits, and the number of R/C chopper sudden quiet when your pride and joy cision, Scale and sailplanes . . . with an pilots is growing at an unprecedented thuds into the ground, after a mechan­ occasional land-sailer or race car thrown rate. Admittedly, kit prices are rather ical (?) failure, is not conducive to the in for good measure. Well, my special steep, however, with the growth of the longevity of the hobby. There are many thing is R/C helicopters and how to keep hobby, they will continue to become bugs in building and flying R/C helicop­ the darned “ things” in the air. less expensive as production increases ters, but problem areas can be antici­ After seeing some photos of Dieter and new ideas are forthcoming. pated in advance and articles published Schluter flying his Sikorsky S.58 heli­ All o f which brings us right to the to help the beginner over the question­ copter at the first International R/C point o f this column: Model builders able spots. For these reasons, Model Helicopter contest, in Harsewinkel, W. often need help, particularly with rotary Builder Magazine will report on new Germany, in 1968, for a record total wing machines. Nothing is more frustra- products for helicopters, pass on hints of about 5 seconds, I knew this was for ing than spending long months of build­ and kinks, offer new ideas and con- me, and started collecting ideas and lay­ ing awake until the wee hours of the morning dreaming up ideas on how to “get-off-the-ground” with my own spec­ ial design. Fortunately, very soon there­ after, Du-Bro Products came out with their "Whirleybird,” and almost simul­ taneously, Schluter was producing parts and pieces for his Huey Cobra. Actual construction was started immediately with a vengeance, and the time spent in this phase of the hobby was probably the most gratifying in my years of R/C modeling. Learning to fly was some­ thing else though . . . many times I would almost give up the challenge, but that necessity for achieving the status of “ chopper pilot” and the elation of see­ ing my labors wildly flopping about the backyard managed to keep me going.

Many gallons of fuel later, I wouldn’t PHOTOS BY JOHN TUCKER consider any other hobby . . . it was that "Chopper Chatter" editor's Bell Huey Cobra, built from scratch. Model Helicopter's fiberglass great! fuselage, Schluter mechanics, O.S. Max .80, Orbit radio. Ship weighs 15 pounds!

14 MODEL BUILDER Close-up of float installation, showing adaptor brackets. Floats are vinyl. struction articles, and present timely information concerning contests, rules and the activities of helicopter oriented clubs. But . . . we ll need your help too! Any ideas or photographs you may have w ill be welcome, since you, the The Kalt Cobra, imported by Aristocraft, is powered by an ST .51, though a .45 is sufficient. builder, are the ones who arc doing the Water test flights were made at the Model Yacht Basin, Mission Bay, San Diego, California. experimenting and the developing of was taken to be sure the C.G. of the little friction to counteract the torque worthwhile ideas. Your input will be floats was exactly matched to the C.G. o f the main rotor and the fuselage ro­ needed to bridge the knowledge gap in of the Kalt so that the “ inflight” and tated in the opposite direction. Very this field. Keep us posted of your per­ “ floating” balance was harmoneous. sonal flying activities and your club little time was required to discover how affiliations. Your questions, when of Later in the afternoon, my son and I much power was needed to maintain general interest to other builders, will departed for the San Diego Model Yacht directional control while taxiing. A fair be given consideration in this column, Basin for test hops. To my great sur­ breeze was blowing over the basin so it so send 'em in. prise, I found no glitches in the installa­ was necessary to taxi backwards occa­ FLOAT-FLYIN’ tion and the flights were spectacular! sionally because of the positive weather- One facet of the hobby that has It took a v.f ile to realize that when a vaneing effect. Vertical lift-offs were never received too much interest is helicopter floats on the water, there is Continued on page 66 water operations; perhaps we have been too concerned over the possibility of dunking that new receiver on a bad landing . . . and we know how frequent that is! Personally, I have had little desire to fly an R/C aircraft on floats since the time I sank a pair of pontoons back in 1939. They had been originally installed on a giant Cleveland Stinson Reliant, with a single channel Walt Good radio, but the ship was about 5 lbs. too heavy to get o ff the water, so I put the radio in the pontoons . . . mounted a Brown )r. on a pylon and dropped the w orld’s first R/C catamaran in the lake at the local country club. My first and only run was a disaster . . . the pontoons hit a rock, disintigrated, and the whole thing rolled over and sank in 3 feet o f water! Well, about two weeks ago, Model A bunch of the "funny airplanes with the propeller on top" at a local chopper "fly-in." Helicopters, Inc., of Tustin, California, Nate Rambo’s original design is in the foreground, next to Charlie Gilbert's original. sent me a pair o f vinyl floats to test on one o f my choppers. They appeared to be well designed, very light weight, and of sufficient size to handle even the large Huey Cobra. Although they come in different colors, my pair was bright red . . . and a perfect color match for my little “ K alt” Cobra. Saturday morning was spent figuring out a way to mount them without having the cross braces interfere with the starter belt. The an­ swer was to eliminate the cross braces entirely and bend simple aluminum brackets so as to attach each float in­ dependently on the regular gear braces. Longitudinal strength is provided by slipping two lengths o f I/2 inch dowel or aluminum tubing through the four Graupner's new Bell 212 Twin-Jet, first seen here at last year's Toledo show. pairs of loops on each float. Extra care

DECEMBER 1973 15 This 34 pound, Monokote covered DC-9 was on display during the R/C World Championships in Gorizia, Italy. RADIO CONTROL REPORT ,=

• Probably the majority o f our R/C such a flying field! I hope they know readers belong to clubs. More often than how lucky they are. I read club news­ not, the club is a dire necessity for the letters from around the country and it flyers, because through it a flying field restores my faith in the ingenuity o f the is obtained and the members work to modellers to see how much time and preserve and keep the club and the fly­ effort . . . real hard work . . . is put out ing site intact. This is usually the bond­ by some clubs just to hang onto a ing agent that keeps the club alive and rough field and keep the grass cut, and working. Be they contest flyers or Sun­ such. More power to them . . . it is also day flyers, the common need for a good apparent that their R/C clubs are strong field brings them all together. and active. Perhaps it is just human na­ It is remarkable what the difference ture not to appreciate anything until can be when a situation exists (as in my you lose it or don’t have it. town!) where the field is furnished and By now you would think that there maintained by the city, and the flyers would be offered to the R/C’er the don’t have to lift a finger to keep up “ all-round all-purpose trainer k it” . . . the field . . . they consider it their right but such a thing doesn’t exist. Still the Dick Penrod, who took all of our R/C W/C to use it and fly there; and even the en­ kits come out labelled “ Trainer . . . use photos is flanked by the Giezendanner broth­ croachments of a polo field and little a .15 . . . w ill do the full pattern with ers, Emil (left) and Bruno, of Switzerland. league ball diamonds seem to be be­ .40 size engines and up” and such as neath notice. Probably this unusual sit­ that. Obviously, to those who know, a what is the best trainer and it is still a uation is the main reason that the club trainer shouldn't be capable o f sizzling hard answer to give. Many models, at has such difficulty in getting members performance. It should make up in least in my opinion, that are supposedly to come to meetings . . . or even to stability what the pilot lacks in ability. trainers are squirrely (hard to handle) or show any interest. Wonderful to have I often get letters from modellers asking too difficult to build for the beginner.

Warren Hitchcox and wife/coolie Shirley. He helped Canadian team Feliciano Prat, Mexico, had the dubious honor of placing 78th, last, to 5th place. He's MAAC President. He was unfortunate in having a total crash late in the contest.

16 MODEL BUILDER Top view of Super Doubler shows unusually large stab. Some paint job!

In the October, all-Nats issue, we only had room for the plans to Brad Shepherd's "Super Doub- ler."This photo shows the completed plane, a great all around performer. Fox .40 engine.

Μ. X. Carey's Galloping John, one of MB ed­ New 40-3/4 inch span "Whizzard" by Ace Radio Control. Foam wing with reinforced trailing itor's many bipe designs. This one has OS .15 edge. Tee Dee .049 power is plenty for one or two channel operation. engine and OR 3 Ch. radio.

I wish the manufacturers o f kits would Ace claims it w ill give exceptionally Materials Company o f 119 Mariposa, only label those kits as trainers that are good performance and with their two Waukegan, 111. 60085. This material exactly that. Unfortunately many be­ channel Commander you can wring it appears to be a urethane type foam and ginning modellers refuse to try the easy out, yet with their single channel (rud­ nothing, repeat, nothing will attack it. flying “ goat” and end up with a plane der only) system you can make it a You can dope it, use resin or epoxy on that is more than they can handle. Ad­ tame ship and it will be good for be­ it, or any kind of paint. It is easy to vice to beginners: please build something ginners. Price is $17.95. shape, and right away I saw the oppor­ like Top Flite’s Headmaster, Goldberg’s Incidentally, Ace’s rudder-only pulse tunity to take a rather dull knife Falcon 56, Sig’s “ Trainer,” and the like. systems are selling at a very fast clip, and form a nice cowl that I needed. A You’ll be happier and you will have an and because of volume parts purchasing coat of resin on the inside and outside, airplane you can handle and learn to they have been able to reduce, yes that’s and then dope, and there you have it. fly. right, reduce the price on all their pack­ It is available in all sorts of sizes and Some interesting items have come age systems by $10.00. In this day of you can make fuselages and wings quite across my desk this month. A new kit is constantly rising prices, that’s really easily. This Pro-Foam is not soft like always interesting and the Whizard by something! You can write to Ace R/C the styrofoam you are used to, and it Ace R/C looks particularly good. Fea­ at 203 W. 19th St. Fligginsville, Mo. has endless uses and applications. Write tures a foam wing with a reinforced 64037 for more information . . . them for prices and sizes and I think trailing edge, 40 3/4 inch span and 240 Some very interesting building mater­ they have samples, too. sq. inch area. Fuselage is balsa built up, ial most o f us can use is called Pro- Finally comes a nifty little gadget of course. With a good .049 Tee Dee, Foam, and is available from Model Continued on page 71

Norway's Poju (Pie-oh) Stephansen flew this ship in Doylestown and Seems as though everyone is flying some version or another of Matt's Gorizia. High fuselage profile nice for knife-edge maneuvers. Super Star. This is Denmark's Ole Harder, T/M Svend Fishlein (left).

DECEMBER 1973 17 MODEL BUILDER In case you're wondering, it goes from right to left! Take one of these along the next time you go flying, and shake up the troops a little.

OCTAGON By TED MACIAG. The auther/designer calls it the "I can't believe it flies flyer." Call it what you will, it does fly, and is also extremely easy to trim. Build it directly from the dimensioned plans. No full size ones needed.

• When an experienced modeler holds which will fly this one, to a large remove the octagon from the jig and an airplane in his hand for the first Dyna-)et version . . . which I plan to add some extra glue on all joints for test glide he can almost feel whether build someday. strength. The smaller front octagon or not it will fly. The first time I held Weight makes little difference, since (Oh, did I forget to say that it flies one of these "I can’t believe it flies” this is not a duration model . . . added small end forward?) is built the same flyers I thought, "It can’t possibly fly,” weight just means a bit more flying way but with a 7-5/16 square jig. The and then, thinking thus, I launched it speed. Because of its stability, this front octagon uses 1/16 X 2 X 3 sides and watched to my amazement as it could be a good design for free flight and the same type corner braces as the floated clear across the front lawn! rubber or gas speed. big one. The strangest thing is how uncritical To further show the versatility o f this The fuselage is 1/32 sheet braced it is to trim. The CG range is broad, and design, I made one out o f .020 alumi­ with 3/32 square, and with stiffeners it doesn’t really stall but merely floats num to fly as a kite in our 50 MPH Continued on page 61 straight down when the CG is too far Texas breezes. It flew well except for aft. Too far forward and it just flies one small problem . . . If the bridle faster. Another nice feature is that it isn’t exactly right, it will dive upwind will not loop no matter how much right at the guy holding the string . . . power is used. A strange sort of Immell- rather unnerving. man is the closest that it will come to a So if you want to build something loop. weird that flies well with little or no This design lends itself to any num­ trimming, read on. ber of variations. A suitable size could I will cover building o f the hoops be made for any engine from an .010, since they arc not one o f your run-of- the-mill free flight wings. First cut the 3/32 X 3 X 36 into eight equal pieces 4-1/2 inches long. With 1/4 in. sq. lay out a square 10-7/8 ins. on a side (in­ side measurement) on your building board, pin these down securely. Next, mark the exact center of each side of the square and center of four of the 3/32 sheet pieces. Line up these pieces along the center lines, one to a side, then bevel the edges 45 degrees on the other four pieces. This will allow them to fit diagonally across the corners o f the square jig and form a neat octagon. Next cut eight pieces 1/4X3 inches

Building a . . er, wing, is quite easy, as you can from the 1/16 sheet and glue securely Author/designer Ted Maciag tries a test glide. see. C lim b is som ething else. It refuses to loop. in place at each corner. When this is dry Should make a great F/F speed model.

DECEMBER 1973 19 The victorious, and obviously happy team from Japan. No. 25, Yoshiki Takahashi tied for 6th place. Tsugutaka Yoshioka, center, is new World Champion. No. 71, Tetsuji Okomura, placed 9th. Team was well rehearsed by Ritsuri Honda, judge at the 1971 championships. R/C AEROBATIC WORLD CHAMPIONSHIPS... 1973

Japan picked up all the marbles in Gorizia, Italy, scene of the 1973 R/C Aerobatic World Championships. All photos by DICK PENROD, story courtesy of Radio Control Models and Electronics, Great Britain.

Champ Yoshioka w ith his Saber Liner. Japanese Digicon 6 radio. Second place U.S. team, standing (I to r): Martin, W hitley, Chidgey Enya 60 III had bored out, pressure regulated carb, used 45% nitro. (Mngr.), Page. Mechs (I to r): Nelson, Keck, and Bridi.

Designer of the fabulous Super Star. Wolfgang Matt, Liechtenstein, Hanno Pretner. Austria's ace flyer, was 3rd. His father, Hans, is at placed 2nd. Note vertical whip antenna. left. Hanno's Super Star varient featured drag-flaps.

20 MODEL BUILDER West Germany's Harald Neckar was in second Top A m erican in G orizia was N orm Page w ith Canada's Phil Soden tied for 6th place along place before the flyoff, finished 4th. his Mach I. Ross engine, Pro-Line radio. w ith Japan's Takahashi.

• The 8th World Radio Control Cham­ featured a variable geometry wing. The a hat-trick by using an unsatisfactory pionships for aerobatics (F.A.I. Class model, called Salamandre, uses a should­ model, and we can only conclude that F3A) was a cliff-hanger to the end. It er wing position, with mainwheels in Bruno was unable to use whatever ad­ was also the largest ever o f the series the fuselage, retracting backwards vantage the design had to offer, and which began, in Switzerland, in I960, through 90 degrees into the fuselage that his flying was very much ‘o ff.’ Flis this time drawing 78 competitors from sides, while the noseleg unit operates as scores certainly prove the latter point. 27 countries. Newcomers were Israel, normal. Wings are extended during take­ Naturally there was a great deal of dis­ Portugal and Spain. o ff and for some maneuvers, but are cussion as to whether variable geometry ‘Sunny Italy’ certainly lived up to its swept back for the rolls, slow, four- is legal according to F.A.I. rules, but name for at least the first three days o f point and triple, the improvement of Bruno Giczcndanner was nevertheless the event, thereafter clouding over which, was the object o f this very com­ allowed to fly. The Salamandre had one at times very dark indeed. plicated exercise. In view o f the disas- other ‘new’ feature an all-flying tail- Practice day is always the time to terous effect on these maneuvers during plane, and was not alone since several study the flying form and to seek out the four rounds o f contest flying, how­ other models also used this layout, in­ interesting model design innovations, ever, it is difficult to see that the exer­ cluding one of the eventual leaders, of which there were an interesting crop cise achieved anything except to cost Harald Neckar of West Germany. this time. Talking point of the meeting Bruno points. On the other hand, it is Neckar, in fact, was one o f those who was certainly Bruno Giezendanner’s equally difficult to accept that such an impressed us during practice flying, (winner at Bremen 1969 and Doyles- experienced flier, twice world cham­ together with the Japanese, all of whose town 1971) innovative new design which pion, would throw away the chance o f models were very fast indeed. It quickly

Yoshiki Takahashi and his Super Star varient shared 6th with Soden. Second highest U.S. team member was Jim Whitley, in 8th. Daddy Sankyo (you're welcome) radio and Enya 60 in his Cinnamon. Rabbit X powered by Ross, Pro-Line (what else?) radio.

Putting all of Japanese team in top ten.Tetsuji Gustav Cappuyns. Belgium, placed 10th. "How you 'spect to win without a bloody Okumura placed 9th. OS 60 FGP and Digicon. Super Star!” Mike Birch, 11th, Capricorn.

DECEMBER 1973 21 Jim Martin. 3rd member of U.S. team, placed 11th in tie with Mike West German team placed 4th, w ith Harald Neckar, second from left Birch of England. Banshee, as usual, put on a good show. finishing 4th individually.

Twice Champion Bruno Giezendanner with Bruno's "Salamandre" held by his pretty Bottom view of Salamandre shows position his variable sweep wing job. He placed 28th. bride. Yvonne. Ship still has bugs. of retracted gear. Maybe next time . . . became apparent that the engine has a.m. a daunting prospect lor judges' judges, all o f whose scores would count become a much more important com­ I wo flight lines were to be used tor (no deletion o f highest and lowest ponent in the aerobatic model ‘system.’ the competition, each competitor flying scores). Team results were to be cal­ All the American team members were twice for each set o f five judges. culated on the basis of the four full using prototypes of a new Lou Ross From the total of four flights, each rounds of competition. designed .60 motor which, with muffler, competitor's poorest score would then ROUND ONE was surprisingly quiet. be dropped and the remainder totalled Thursday was a bad one for many British team members Mike Birch, to select five linalists for a two-round of the top 'names.' Bruno Giezendanner, Dave Hardakcr and Dennis Hammant sudden death fly-off which would deter­ the champion, was in trouble with the had settled in well, making (lights early mine the final positions for the top variable geometry Salamandre with in the dav which lor practice and sub­ five. The fly-off, on a single flight line, three rolls which were so barrelled that sequent competition days began at 7 was to be judged by a full panel of ten the model exited going almost vertically down he claimed interference and aborted the flight . . . and his brother Emil also had no luck when the noseleg of his Marabu collapsed on take-off. Norman Page, leader of the U.S.A. team, ran out of time, and Wolfgang Matt, the Super Star designer, 2nd at Doylestown, almost scraped a wing tip on take-off. Our team leader, Mike Birch, made no such mistakes with a good flight which, for a time, put him in 2nd place, and the 'Lunch-time scoreboard’ still listed him as 3rd, proving that the ‘Feltham Flash’ was well in there. Dave Hardakcr did not fare so well, and Dennis Hammant suffered an engine flame-out at the Cuban Eight which left him well down. One o f the very pleasant surprises o f Round One was the Hying of Phil Soden who, as many contest fliers in this country may recall, emi­ The host team in Gorizia, Italy (I to r): Roberto Bacchi (Mngr.), Benito Bertolani (20th), grated to Canada from the Birmingham Ruggero Pasqualim 113th), and our friend Graziano Pagni (23rd). Team placed 6th. area a couple of years ago. Our loss is

22 MODEL BUILDER Naphtali Horowitz was the first contestant ever to be entered by Constantine Papaspyrou was the only contestant representing the Israel. He placed 70th. country of Greece. Nice looking ship. Note underchambered tips.

Jiri Havel, champion of Czechoslovakia, was 49th, just above team­ Portugal's only team member, placing 72nd. was Mendes de Almeida. mate Michaelovik. That checkerboard striping sure is popular ! His ship is Ron Chidgey's Tiger Tail design. certainly Canada’s gain for Phil won 8. Birch 3600 with only a single second to spare on himself a place in the Canadian leam 9. Berlolani 356.6 the stop watch! Birch’s performance in and certainly justified his selection 9. Cappuyns .3565 this round was also nice to watch - pre­ when, at the end of the first round he II. Whitley 3550 cise and deliberate with liberal use of was silting pretty at joint 2nd place with 12. Martin 3535 throttle. He must have lost points for Yoshioka of Japan, behind Hanno Pret­ 13. Matke 3525 commencing his rolling maneuvers late tier o f Austria. Positions of the lop 15 14. Pasq ualini 3465 (a common fault throughout the cham­ at the end of Round One were: 15. Weixelbaumer 3460 pionship) and for a slightly diving I. Prctner 4055 With two flight lines in operation straight inverted flight, but it was good 2. Soden 3765 however, first round scores tell a rather enough to draw in a better score than 2. Yoshioka 3765 distorted story. In Round Two we his first flight. Dennis Hammant’s cup 4. Kristensen 3745 watched Dave Hardaker make a good of gall overflowed this round when he 5. Matt 3685 clean flight, although he almost lost his experienced a second consecutive engine 6. Yoshiki 3660 motor which sagged momentarily in the cut although he at least managed to gel 7. Okumura 3650 outside loops and he finished the flight Continued on page 62

Another Super Star! This one was flown by England's Dave Hardaker Luxemburg's Paul Behm placed 60th with this Super Star varient. to 17th place. More checkerboard striping, too! The design seems to be the peak for the present FAI pattern.

DECEMBER 1973 23 John Brodbeck, Jr., with K & B (what else?) Minnow made his best Don Powell and his caller, on and off the race course, Bobbi Powell. time to datePYLON at Oxnard, California; 1:235. Ship is "El Bandito.” By TOM CHRISTOPHER

PHOTOS BY TOM CHRISTOPHER

• At press time, there is quite a bit of concern as to qualification for the up­ coming Tournament o f Champions event to be held over the Thanksgiving holi­ days. There is only one more race for points in Formula I, that being only one Ron Schorr and his Mis DARA with K &B by Bob Johannes, Jr. took first place in Standard week away at Whittier Narrows in Clarence Lee. Class at W hittier Narrows, Sept. 8 & 9. Southern California. We are sure that this will be some event! Two classes of problems that we have in Pylon racing We would want no less than one racing will be held at this premier event, occurring quite frequently. One problem thousand! Formula I and FAI Pylon. Prior qualifi­ area that we didn’t have was this hass­ 3. Most important o f all: Give the cation as to points is required for For­ ling over engines. Frankly, we are quite racer the confidence that this is mula I, and you w ill be welcomed with sick o f hearing about this and reading the way it w ill be for this racing open arms if you have an FAI bird! about it continuously, much less having season without the thought of his Qualifications aren't needed in FAI to write articles and wasting words on equipment being subject to change due to the shortage of entries in the the subject. We would however, like to at the next race! event. suggest a solution to the problem. We You are probably saying to yourself, During this past season, the engine have a President, Sec/Treasurer, Dis­ "I thought that was or is the way that it controversy has gone as we had expect­ trict Vice Presidents and Contest Board is being done.” Don’t kid yourself; we ed. There is still concern as to having members. We have an annual meeting enough engines to go around for every­ each year at the Nats with District f one! It is really amusing to see a sport meetings at least once a year. Why not controlled by the manufacturers to the run our rules as to engines, types of extent that ours lends itself. The engine aircraft, general rules and so on, one rule is one of many areas that applies year at a time! At the yearly meeting, to the compromises, rule bending and decide then what engines, aircraft and just plain politics! We may be wrong in specific rules will be used for the com­ our thinking . . . we have been before ing year. If a manufacturer wants his . . . but it is to our way of thinking engine to be used, it will be presented that this sport doesn’t need the manu­ to the Contest Board for approval. This facturers nearly as much as the manu­ also applies to other areas o f our sport. facturers need us! We are speaking now Once the yearly meeting is over, the in terms of the Racer, Pattern Flier, only time an engine will be approved and Sport Flier. So why make rules up w ill be at the next yearly meeting. This around a manufacturer’s timing as to will accomplish the following: production, how many engines he wants 1. Make certain that equipment in to make, and how he wants them re­ use will not become obsolete dur­ presented . . . by us!!! ing the current racing season. Your Pylon editor participated in 2. Eliminate the continuous hassle o f Professional Outboard Racing for eleven compromises as to how many en­ Bud Anders was second in Standard Class at years and found many of the same gines will be available and when. W hittier Narrows. He's half of A&L Distrib.

24 MODEL BUILDER Bud Anders moved to Expert class w ith a 1st placewin at Oxnard. Father and son team of Al (left) and Terry Prather placed first in Must be that shirt .. . or maybe Clarence Lee, his caller. Expert Class at Oxnard, Formula I, Oct. 13 & 14.

Smiling Ron Clem, 2nd Place winner in Standard Class at Oxnard. Joe Vartanian points to wire bracket which kept the ST X-40 exhaust Is that a Northern Virginia R/C club cap he's wearing? pipe in place after two days of racing. Jim Jensen smiles approval. promise you that this is not the case. If deserved victory. This places Anders in the manufacturer knows what to expect the expert class from now on. The guys from NMPRA, he has something con­ in Standard are really glad to get rid of crete to go on. At present, this organiza­ Bud!!! tion is so flexible it hurls! When this We notice that the times in the happens, the organization starts showing Standard Class are starting to approach signs o f being ««professional! So far, that o f some o f the experts. Also, the when we speak our minds about this extremely fast limes took its toll in entire subject we are saying only this, quite a few crashes at the Oxnard event. "When we make rules or vote on issues The safety precautions used by CD or changes, for Heaven’s sake, let’s at Chuck Smith and the Valley Flyers pre­ least enforce them!!!!” vented what we are sure would have The Valley Flyers of Van Nuys, been one or two serious accidents. It California hosted a very successful race was also good to see Bob Bleadon back October 13-14 at Oxnard AFB, Oxnard. in action again. I happen to hear him This was the first lime that many of us say that he would have been in there had seen a more complete race site than all the way if he could have stopped his Terry Prather's ST X-40. Leverage of long ex­ the old Mile Square. We all had a week­ caller, Larry Leonard from panicing on haust pipe causes vibration problems. end of fun and enjoyment with many him during the race! Ha! Bob is one thrilling races. Terry Prather emerged as who has extreme w it and enjoys this the Oxnard race and they showed me a overall winner in the Expert Class, fly­ sport to the fullest. unique way o f attaching the rear ex­ ing one of the new Super Tigre X-40 We would like to give you a little in­ haust of the X-40 so it will stay on dur­ Schnucrle ports in a modified Stafford formation on the SUPERTIGRE X-40 ing the pounding of a race. It is sim­ Minnow. There was a three-way tie for Schnuerle. A t present, there are four o f ple; uses a silicone adhesive "O ” ringat first place in the Standard Class between these engines that arc doing quite well in the header and a stainless wire cradle Bud Anders, Loren McCray, and Ron the Southern California area. They be­ with silicone to steady the stack to the Clem. Loren McCray had crashed after long to Terry Prather, Jim Jensen, Joe fuselage. In the photo, Joe is pointing the last round o f flying as the result o f a Vartanian and Tom Tussing. Terry uses, to this little innovation. landing mid-air, which left him without along with his own fine grooming, the Tom Tussing’s father does all the an aircraft for the fly-off. Anders and services of George Aldrich in preparing work on Tom ’s engine and he really gets Clem proceeded to the flight line for his engine and set-up. We do not know it to move! The engine has a different the fly-off, but during the count down who helps Jim Jensen and Joe Vartan­ torque curve than that o f the K&B in Clem’s engine mount came loose from ian, but they seem to have a knack of that the X-40 accelerates from the start the firewall and the overall win in extracting gobs of power from this en­ like a shot, comes o ff the corners good, Standard went to Anders, with a well gine. I talked to Jim and Joe just before Continued on page 67

DECEMBER 1973 25 PHOTOS BY FERNANDO

FREE FLIGHT SCALE By FERNANDO RAMOS

Φ The Rockwell International Flight- part of the activity. Ed manufacturers masters Club has just completed its those nifty little CO2 powered old-timer 24th Annual Scale Contest. This has to models. Nevada was represented by Bob be one of the largest F/F Scale competi­ Haight and his wife. tions anywhere in the country. There The events were numerous, including were 92 entries! rubber, Peanut, gas, electric, and CO'2- The contest actually began on a There was also an exhibition event for Saturday evening, at R.I.’s Recreation static models on Saturday evening. Sur­ Center, where the models were sub­ prisingly, there were 14 entries in CO2, mitted for scale judging. This really gives showing an increased interest in this the contestant a chance to carefully particular event. Peanut led the field examine some excellent models and to with 32 entries; rubber was just behind compare building techniques with other with 30. There were 12 gas powered contestants. This year was unusual in models and only four electric. Unlike that Rockwell International had a hobby the Nats, where CO2 and electric power show on the same day, and the Flight- can compete against gas models, these masters were a part o f that show, with are separate events at the annual. The an exquisite display of models. Flighlmasters feel that having separate This year, the annual drew several events for these various power forms families from Texas, including Vic Lar­ tends to develop belter models, since sen, his son Guy, and George Meyer they arc competing only against others (designer and builder o f the real "L ittle o f the same type of power. T oot" biplane). George brought sixteen Saturday night judging usually takes outstanding models along with him, of about four hours o f hard work, and Curtiss Mooney, about to launch his Cub. which he entered seven. Ed Toner and while this was going on, Bill Warner his wife flew in from New Jersey to be provided entertainment with his slides

Beautiful Curtiss Hawk F6C-3 by George Meyer. One of many ships he brought w ith him Bob Haight, Las Vegas, and his Fokker DR-1. from Corpus Christi, Texas for the annual event. Power is the Brown CC^.

26 MODEL BUILDER The name of the game is FLYING scale, and fly they do. (I to r): George Meyer's rubber powered Sopwith Tabloid, Bill Warner's diesel powered "Miss Los Angeles," Clarence Mather's rubber powered P-51, and Bill Krecek's big rubber powered FW Stosser. of the Oskhosh E.A.A. Fly-in and the ‘73 Nats. Flying took place on Sunday morn­ ing at the Sepulveda Basin, which is pre­ sently about the only flying site for the greater Los Angeles area. It is now going through a renovation which includes paved streets and park sites, among other things to shrink its F/F size. The weather, as it has been in the past, was perfect . . . no wind and plenty o f sun­ shine. Many of the contestants with smaller models made theirofficial flights early in case of a latent wind. I found it extremely difficult to try and fly a couple o f my models and still take pictures and cover all o f the activi­ ty. I finally gave up trying to compete Bill Stroman's Valkyrie, a rigging nightmare. The CO 2 tank is the pilot's body, and the filler so that I could do the latter. (Actually valve is his hat. . . . and it flew, too! this is an excuse, since neither of my models were doing very well. One flew into a truck, knocking off a wing, and the other had a leaky head, which for CO2, ain’t too good.) Hal Cover started things rolling with an early qualifying flight o f his out­ standing CO2 Focke-Wull TA-I52. He started the diminutive engine and re­ leased the stretched out version of the F.W. 190 into the breeze. The T.A., with its wide track, made a long, im­ pressive takeoff run, followed by large overhead circles. Then it came in for a near-perfect landing on the tarmac. I’m still amazed at the performance of these Brown CO2 engines. Some other neat flights in CO2 were made by Kingsley Kau’s ultra-light Blackburn monoplane, Another Bill Stroman creation, the Yamoto, from "Those Oaring Young Men and Their Flying and Bob Haight’s Kempf Fokker DR-1 Machines." Has .020 power. Bill must have stock in FH Wheels! flew very realistically with its three plank-like wings. However, the Dreid- ecker refused to R.O.G. Bill Stroman had another unusual airplane. This time it was the Valkyrie. It was unique in that the CO2 tank was part of the body of the exposed pilot, and the filler valve became part o f his hat. It flew as slow as the real one probably did. Vic Larsen had a highly modified Comet kit of a )N-4 Jenny that was very detailed. Our California air didn’t agree with the Texas weaned CO2 engine, and it was unable to get enough revs to do the job. Incidentally, Bill Watson has a modi­ fied 5 Ib. CO2 fire extinguisher that is really the ticket for loading the little Brown engines. He has had hundreds of fills and the bottle is still two-thirds filled. I hope to have an illustration of Vic Larsen's CO 2 powered JN-4 was built from a modified Comet kit. Judging of models for the this conversion in next m onth’s column. scale fidelity portion, took place the night before the flying at Sepulveda Basin.

DECEMBER 1973 27 fI

George Meyer with his Curtiss Hawk F6C-3. We hope to have this Bill Krecek with his big rubber powered Stosser. The parasol wing rubber powered job as a near future construction article. and long landing gear make it a natural for rubber flying scale.

In rubber, Bill Warner's Comet AC-4 led the field with Hal Cover and his Bellanca YO-50 second. It is always in­ teresting to watch Hal wind his models, which normally have a wad o f braided rubber that could “ do in” the weak- hearted. Clarence Mather, a perennial winner, was 3rd with a P-51 Mustang. He’s another that is great to see in action. Much can be learned by care­ fully observing these outstanding model­ ers in action. Following are just a few highlights of some o f the other events. One impressive flight made in the gas event was that of Bill Stroman’s Yamoto (one of the bi­ plane entries which was featured in the

great movie “ Those Magnificent Men Hal Cover's beautiful CO 2 powered, stretched Foche-Wulf TA 152. It flew well, for a first place and their Flying Machines” which had in the event. Plans for this and other WW II scale models coming in a soon-to-be-published book. pendulum aileron control. It took off and flew beautifully for its qualifying flight. Peanut models were in the air so fre­ quently that they looked like a squad­ ron of gnats. Clarence Mather had a Thorp T-18 about ready to fly out of sight when the noseblock slipped out and luckily D.T.’d the model. Otherwise it would have been lost for sure. Even though there were the fewest entries in electric, one revelation occured that took me by surprise. All electric power models that I have seen have been around 30 to 36 inches in span and their flights have often been marginal due to weight and size. Yet, there was one entry, Addie Naccaralo's Flying Scale editor Fernando Ramos' CO 2 powered DH-2. With gas and alcohol rationing, and inconsistant rubber quality, CO 2 , along w ith electric should have a popular future. Aeronca Chief, which had a 4 foot span. This model flew remarkably well with its gear-whirring motor, just about the time you figure out what design will work best for electric . . . so you think . . . someone comes along and re­ adjusts your thinking. Alas! One factor which was quite evident at this contest, everyone was having fun. Winning is great, but not necessari­ ly the primary goal. I personally feel that this is why this particular contest is getting more popular every year, and the number of contestants is increasing. It is a time and place that scale modelers can come together and do their thing, with fun as the main objective. Next year it will be the Flightmasters Silver Anniversary, and I’m sure that it will be Jack Elem's Cessna Airmaster was modified from a Comet kit. Always a consistent performer . . some contest! Plan now to attend. · . . the airplane, that is .. . you can never tell about Jack!

28 MODEL BUILDER The prototype 0-25C, s/n 32-181, at Clover Field, Santa Monica, September 16, 1931. A Curtiss Conqueror powered sister of the 0-38 (Nov. 1973 MB), it had an earlier model number though it first flew a year after the 0-38. DOUGLAS 0-25C By PETER WESTBURG

• This month’s set o f drawings is o f the Douglas 0-25C, a younger sister of the 0-38. A follow-on to the 0-25A (the 0-25B’s were three 0-25A's for the M ilitia Bureau), it had an earlier model designation but flew a year after the 0-38. The two airplanes were nearly identical except for the power plants and slightly different fairing of the top of the fuselage aft o f the rear cockpit. The 600 hp geared Conqueror was installed in a close-fitting cowling similar to that used on the gullwing B-7 bomb­ er; it was later used in a slightly modi­ fied form on the 0-31 series and on the YlO-43, one of the most beautiful air­ craft o f all time. Thirty 0-25C’s were delivered to the Air Corps in 1932 and they were amongst the four Douglas types that carried the mail in early 1934, when President Roosevelt summarily cancelled all air line mail contracts and ordered the Air Corps to carry the mail. The 91st Observation Squadron flew the mail out o f Salt Lake City, using 0-25C’s in an operation headed by Lt. Colonel "Hap” Arnold. Machine guns were re­ moved, the rear cockpit stripped and made into a bin for the mail sacks, also, the rear windshield was removed and a canvas cover snapped over the opening. National Guard squadrons flew the 0-25C in air tours and at state fairs, putting on some spectacular shows. No one who ever heard the sound will for­ get the snarl o f the short-stacked Con­ querors as the 0-25C’s came in low over The clean nose, w ith oil coolers and Prestone radiator underneath, and the high thrust line, make the 0-25C an ideal subject for modeling . . . rubber or gas. And, it's a biplane, folks!

DECEMBER 1973 29 .15 0 .29 .64 .53 3.20 1 1.8 2.82 1.69 1.50 2-43 2.16 1.36 4 .35 2.00 1.21 1 .04 1 Z*. LOWER •VAY, •VAY, I97( 0-25C 0 1932 1.99 5.99 3 .0 0 54.06 59.29 5ft.5? 51.07 36.07 57.06 55.57 4 8.07 4 2. ' 7 29.98 » 7.98 » 23.99 STA.2 .15 • 98 • DOUGLAS ARCRAFT CO SANTA MONICA CALIF. 4.35 , 60.00 1.25 7.24 2.23 5.80 7.5·' 5.76 8.17 Θ.65 4.10 6.50 9.70 9.32 9.7 7 9.28 8.42 1 1 AC' uMED BY MANUK [ Y . j x . '^p 72%' __ 5.93 2 .9 6 58.44 35-00 5 6 .Jfl 55.36 3.835 5 7.80 4 4 '.7 9 »7,81 47.79 29.72 23.7« UPPER UPPER UPPER LOWER 1 1 59-2C f 60.00 FRONT FRONT VIEW i " : 8 ? ang le : : DOUGLAS SIDE SIDE VIEW AND

~ 9 l~ 7 SHEET :1 I 3 OF7 ~ T. T. E. 5.00 5.00 oel 70.00 50.00 0.001 ' ' F M 50.00 B 0.00B 50.00 9 4·. 4·. .0 > 20.CC 9 0 .0 0 92.57 : s o o . o o 1 .75 9S 1 , 9 7.5C 9 51 .CO i ground μ FUSELAGE FUSELAGE CROSS SECTIONS, RA,VN RA,VN BY-.· W.WESTBURG R

at WI«G LPPERf nus : n u A. 5 A. c PC s TAT i .PILI .PILI Λ Λ & WINGS , TAL WHITE IVE IVE LUSELAGE. DRAB YEL- BLACK BLACK ?\* Λ NV' _ΕΓTERING _ΕΓTERING ON FUSELAGE. CG. CG. .AS U S A:» ARMY CORPS 5ϋ '.KN 9 Γ !A. PR j .7 · , j ■ A . 6 . A j ■ £ Λ 7 Λ ■ 7 bTA. bTA. T«EAD 9«; b . N-. fΛ' s t a >ΟΚ . . . AöF AöF . CROSS SFC . o . i a s r -'•->K Nv A; Nv -'•->K These plans first published in the November 1972 issue of AIRPOWER magazine. V FILL AIN AIN FUEL STA. B STA. i ·. i ·. KIN·. Af · i l l F i l O LIGHT STEP l ÅNDING S r A . ' RETRACTABLE .OOK.NG

Copies of the original 28 x 40 inch drawings of the 0-25C are available at $430 per set.

CO o Order direct from PETER WESTBURG, 834 Seventh St.. Santa Monica, Calif. 90403. MODEL BUILDER DECEMBER 1973 31 These plans first published in the November 1972 issue of AIRPOWER magazine.

Copies of the original 28 x 40 inch drawings of the 0-25C are available at S450 per set. MODEL BUILDER 32 Order direct from PETER WESTBURG, 834 Seventh St., Santa Monica, Calif. 90403. the crowds and peeled o ff in sharp, Like the 0-38, the 0-25C is easy to Above: Streamlining of in-line engine pays. climbing turns. model and it has the added advantage Though 400 lbs. heavier, the 0-25C had top Finish o f the 0-25C was standard for o f a high thrust line and fairings under­ speed of 161, against 150 for the 0-38. Air Corps airplanes o f the early I930’s, neath for modelers who go for inverted Below: Cowling over the pilot's Browning .30 with olive drab fuselages and gear and engines. · caliber hinged for quick servicing. Note ammo chrome yellow wings and tail surfaces. container and shell ejection chute.

DECEMBER 1973 33 LUEKEN'S' LUFTTLUGHAr£W

Peanut Scale "A ir Force" belongs to the Lueken family, of Escondido, California. after your model. Incidentally, if any of you are in PROLIFERATING PEANUTS SIDE WINDERS need o f a new winder, they may be ob­ According to our mail, it is difficult One o f the most useful tools to the tained in a choice o f two ratios (9/1 and to stop at building just one Peanut, and rubber-power enthusiast is a mechanical 16/1) from either Marlow Engineering, some people wind up with a whole winder, which does away with the tire­ 6850 Vineland Ave., North Hollywood, squadron of them. Typically, Walt some and inefficient hand-winding of California, 91605 or Peck-Polymers, Mooney and his family arrive at a con­ models. One annoyance, however, is the P.O. Box 2498 La Mesa, California, test with the back o f their van FULL case with which they can become lost 92041. The price for either type is of Peanuts. And, during the recent or damaged, out at the flying field. An $4.49, plus 35 cents postage. Flighlmaster Annual Scale Model event, obvious partial cure is to paint them George Meyer, o f “ Little T oo t” fame, with a bright “ day-glow” type color in WOMEN’S (ad) LIB arrived with an even larger armada o f order that they may be more easily seen There seem to be at least three differ­ the tiny terrors than the Mooney clan. when dropped in tall grass or weeds. ent attitudes among modeler’s wives. One o f our photos this month de­ Also, it is certainly a good idea to affix Some encourage their husbands; some picts yet another passel of Peanuts, as one’s name and address, so that positive tolerate the hobby (after all, hubby produced by the Lueken family, of Es­ identification is possible. might be out chasing the OTHER kinds condido, California. Flere is a poem Neither of these approaches will pre­ o f models); while the third type actually which accompanied the picture: vent damage which can occur if a winder participate themselves. This latter cate­ See the toys. is dropped on a concrete or asphalt sur­ gory is extremely rare and precious, not Are they toys? face. Frank Scott suggests attaching a to mention in very short supply. No. thong, which will permit the winder to Actually, most wives would simply They are Peanuts! be secured to one’s belt or belt-loop. rather not discuss their views on the Aren’t they funny looking Peanuts? Allow sufficient length to permit easy subject, but happily, there are excep­ They are not really Peanuts. winding. Usually, the winder hook it­ tions, such as Sharon Stroman, who They are airplanes. self can be hooked over a belt loop, and puts it this way: Do they fly? yet, without some sort of safety thong, INCOMPATIBILITY Sometimes . . . it may fall off during a high-speed chase Where did my clothespins go? They are holding a wing together. My gourmet dinner is ready, and must be eaten now or it w ill be ruined! Sorry, he has to finish doping his fuselage. My idea for a vacation is Las Vegas, his is the Nats. Continued on page 64

Dave Paine is a firm believer in a "pilo t for eve*y plane," and in fact feels it should look like a CO 2 powered Sommer Monoplane, built by pilot (MB's editor is still partial to Yogi Bear). Read how Dave made this one. Jacques Pouliqen, France. FH spoke wheels.

34 MODEL BUILDER FOTOS BY FUDO RAPID PEANUT - SPEED SPITFIRE By WALT MOONEY. This month we have a hot peanut! Built with the Scale Rubber Speed event in mind, the Speed Spitfire disclosed a need for turbulators. Aerodynamics plays no favorites!

• Perhaps one of the prettiest fighters ing clay on the nose to put the CG model slows down and enters a critical ever built, the Spitfire was even nicer, directly above the wheels, in an attempt Reynolds Number air flow. If so, tur­ in my viewpoint, as converted from the to hold down the climb. It achieved al­ bulators should modify the flow condi­ Spitfire I to a special standard (Type most 30 mph, which is almost twice tions, prevent the separation, and stop 323) for an attempt at the World’s what you can expect if it ’s flown for the violent changes in downwash over speed record. This airplane . . . there was duration with one loop of 1/8 or 3/16 the tail, which cause the pitch up as the only one Spitfire so converted . . . was rubber. As a speed model it had the glide model slows down. specially cleaned up aerodynamically, of a streamlined brick . . . literally A thread turbulator was installed on with a shortened wing, flush riveting, a straight down. the top surface of the wing at about the cleaner canopy and a smooth glossy It was then entered in the Flight- Continued on page 60 paint job. It was equipped with a more master’s Annual, in the Peanut event. powerful engine that required the in­ Although it made several qualifying stallation of a larger radiator and oil flights, none of them were of much cooler. A special fixed-pitch four bladed duration, and all the landings were propeller was used. violent to say the least. It was OK dur­ Both Heinkel and Messerschmitt pro­ ing the high powered part o f the flight, duced airplanes that outstripped the but as the motor ran down, it would Spitfire’s speed capabilities before it pitch either up or down with an ensu­ had a chance at the record, so no record ing dive into the ground . . . either attempt was made with it. But from my later or sooner. point of view it sure looks nicer than After some thinking, a suspicion that either o f the aforementioned aircraft. perhaps there were airfoil flow problems This Peanut version was built for the were entertained: Suppose the relatively Flightmasters Speed contest and is quite smooth airfoil . . . there are no exposed rugged. It was flown with two loops of spars on the original model . . . is suffer­ Top view photo shows the pleasing and dist­ quarter flat rubber and enough balanc­ ing from laminar separation as the inguishing lines of the Spitfire.

This one-off version of the famous fighter was built for one purpose, Next month's project is the DH-6. Previously designed as an all-sheet to establish a speed record. Others exceeded its max, unfortunately. model, this built-up version is lighter, and a better flyer.

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36 MODEL BUILDER DECEMBER 1973 37 Hans Zachhalmel, Austria, 14th in Wakefield. Tom Koster, Denmark, displays top form while launching his "flapper," w ith which he placed 6th in the fly-off.

This month, our Free Flight column takes a pause that we hope, refreshes. Starting with the January issue, Bob Stalick, who should need no introduction to active free flighters, will take over the operation. Mean­ while, review these photos taken by Jack Humphreys at the F/F World Championships.

I ·'

Petko Stoilov, Bulgaria, eighth in power. Sin Sang Gel, N. Korea, placed 9th in the Steen Agner, Denmark, captured third power fly off. place in the power fly-off.

38 MODEL BUILDER (I to r): Ron Pollard, G.B. (19th), Mike Thomas, Can. (38th). and Ian While watched by greatly concerned time keeper, Japan’s Mitsuo Kaynes, G.B. (47th). Ian is editor of well-known Free Flight News. Kobori winds Wake. He placed 3rd in fly-off.

Andreas Meczner, from Hungary, placed 7th in power. Mitsuo Kobori's prop is carved from hardwood.

Gordon McKenzie holds for Jack McGillivray, who placed 20th Brian Eggleston, Toronto, Canada, flew this V dihedral power in Wakefield. model to 29th place.

DECEMBER 1973 39 Ferit Aksu launches for Idris Aslan, both are from Turkey. Idris Kim in Sel, North Korea, launching his Wakefield. He was 40th in was 89th in Nordic A/2. the event.

Claude Zimmer of France was 28th with this all sheet balsa power Italy's Guseppe Venturoli was 33rd in Wakefield. Note forward ship. location of fin.

40 MODEL BUILDER ing an engine modified is quite expen­ sive. Well, the young man who does my modifications is not expensive and he does super work. My red insert Super Tiger is turning an honest 24,300 on a Bartels 7-3-1/2 prop! There are other people in the upper midwest who will also attest to his abilities. In fact I understand that the notorius Hardly Brokenspar has sent an engine to this young man in an attempt to gel his air­ ΑΜΑ MEMBERSHIP RENEWAL ENGINE MODIFICATIONS craft higher than 7.4 feet o ff the Last month I told everybody that Those o f you who are active in free ground! The young man’s name is: when renewing your AMA membership flight power competition, both in AMA John Lorbiecki, North 100, West 15425 thisyear be sure and mark the tree flight classes and FAI, have found that more Mars Court, Germantown, Wisconsin box to indicate your preference. Well, I and more winning planes have modified 53022. Some of his charges are; S I7.00 just received my renewal application and engines. This has been true in FAI full modification, $2.50 Cox insert, the modeling preference section has power for some time now but it’s start­ $1.50 modified head to hold insert. He been deleted from the form. I don't ing to show up in the AM A classes. also makes Taylor type front ends for know if it will do any good but you Many people have complained that hav­ rubber ships. Price $6.50. · might do as I did and write "I am a Freeflighter” on the form somewhere. I wrote mine using red ink and large letters! I hope they get the point! (Or use the form with our subscription com­ bination offer on page 2! wen) NFFS DIRECTORS REALIGNED Because of compelling career require­ ments, Bob Stalick has resigned as Dircctor-At-Largc and President of NFFS. Don Krus, Director-At-Large has been appointed President. Mark Valar- ius, a candidate for Director-At-Large in the most recent election, has been appointed to fill the Director-At-Large position vacated by Bob Stalick. Bob Stalick has served in many posi­ tions in the NFFS, including Executive Director, since its inception, and con­ tinues as a member of the NFFS FAI Committee. NATS NEWS FLASH I just talked to Frank Ehling at AMA Headquarters and he said that since we talked before they have had three offers for the Nationals. Keith Whitney, Salt Lake City, Utah, lights the fire in his Orbiteer. which set a Cat. II record The first was Lakehurst, Naval Air of 27 minutes. Model is available in kit form from Competition Models. Station, New |ersey. Frank said that site is at least as good as Chicago. The second and third were San Antonio, NFFS MEMBERSHIP AND RENEWAL APPLICATION Texas and Lake Charles, Louisiana. From the maps they have received both (Make checks payable to; National Free Flight Society) look very promising. )ohn Worth will Mai! to; visit both sites the early part o f Novem­ Ri Kelrh R R 4 Rnx 475 ber, so maybe we will have a NATS site W. Terre Haute, 1 nd., 47885 1 y r 2 yrs by the next issue. RESIDENTS OF FOREIGN COUNTRIES $ 4 $7 I don’t know if these offers were a Age 19 AMA Members 4 7 result of my requests in this column or U.S. and up Non-AMA Members 5 9 not, but three cheers and a max for the RESI- Age 15, 16, 17, and 18(Senior) 2 4 people in San Antonio, Lake Charles DENTS Age 14 and under(Junior) 1 2 and Lakehurst. Family membership* 1 2 Frank also said there's a possibility All members receive NFFS Digest. Name AMA No. that the next World Championships in Family membership fee includes R/C, Control Line and Indoor might be all additional family members, but Address no additional copies of the Digest. held at Lakehurst. Ages are as of July 1 of current City. State Zip Because of the geographical location year Please circle applicable fees.

I think the Lake Charles or San Antonio New Member [^] ’ Please list family members sites would be better than Lakehurst, Name Renewal however it will depend on which is the Address Change CD better site. The more centralized site A M A N o. would be better because more people Current expiration date: would be able to attend. M o n th Year

DECEMBER 1973 41 PULI-Q a/tnordre

Get into competition free flight with this easily built A/1 Nordic towliner. Fuselage is made of sheet balsa, soaked in warm water, and formed over a pool que . . . thus the name.

By JEAN ANDREWS

This ship owes its existence to the publishing o f Bob White’s Wakefield in the June 1972 issue o f MODEL BUILDER' After building two of them, wc found we had a couple o f balsa tapered tubes left over. Pull-Q was virtually designed around these tubes, and since the physical lay-out of this towline is very similar to White’s ship, which was nick-named "Pool Cue” (for the shape of the tail boom,) we had no choice but to steal the name for this towliner also. One o f our pet peeves is writers and kit-builders who refer to the smaller A/1 gliders as “ Beginner’s” models. It ’s been our experience that a good-per­ forming A/1 glider is more difficult to build, transport, trim and tow, than the larger and more-forgiving A/2's. Pull-Q is NOT a beginner's model, although it can be built and flown successfully by modelers with a few A/2’s under their belt. It will be much more sensitive on tow than some other ships, though, so beware. More on this la te r. . . CONSTRUCTION We prefer to lay up the wing on a new model first, to get the ‘routine’ parts of building out of the way. The plans are laid out so all three sections of the wing are built over the one drawing, so note where the two outer wing sections end on the plan. Cut all wing ribs from medium-hard I /16th sheet. The wing sections were built inverted over the plans in the following manner: First the spar was pinned down over the plans, and the ribs fitted to it. Then attach the hard­ wood leading edge, and finally the trail­ ing edge, formed from sheet wood or stripped from 1/4 inch tapered glider wing stock. Use whatever method you desire: the above was the easiest we could come up with for such a deeply- undercambered airfoil. The center sec­ tion main spar is hardwood, the two outer panels have balsa main spars. After the center section is assembled, and removed from the plans, lay up the two tip sections and allow them to dry. The center section o f the center wing panel is covered top and bottom with 1/16 inch soft sheet. This is set in flush by trimming the ribs down to suit. Finally the three sections of the wing are joined, with 5 1/2 inch dihedral braces, we used scrap pieces of leading FULL SIZE PLANS AVAILABLE - SEE PAGE 72 42 MODEL BUILDER PHOTOS BY JEAN ANDREWS Jean Andrews' A/1 Nordic glider PULL* (towline, get it?) Q. Construction is quite simple, and should make a good project for someone breaking into serious competition. Ship already has a 1st place to its credit. edge stock to bridge the dihedral breaks. inspect them carefully for signs o f split­ o f the body. Keep the weight down out here . . . ting, particularly around the small end. Install the stab platform before cut­ the joints should be string, but it’s Use the better o f the two tubes for ting the slot for the vertical fin. The unnecessary to make them any stronger the full-length fuselage. Trim the seams body tapers to flush against the fin, so than the wood structure. carefully and cement it along its entire stab platform helps hold the proper The stabilizer is fairly easy to build. length. Allow this to dry while the taper in the body tube forward o f the As in A /2’s, build it light and plan on other lube is cut off at about the four­ stab. strapping it to a piece of 1/4 inch sheet teen inch point from the large end. Make up the wing pylon, as shown when not in use, to keep it warp-free. Coat the outside of this short section on the plans, and measure carefully to Fuselage construction is begun by with epoxy, roll it as tightly as possible yield a 1/4 inch higher leading than wetting two pieces o f medium-soft 1/16 around your finger, and insert inside trailing edge on the wing. When the inch sheet wood in warm water for a the outer tube until the end is flush pylon is installed, this will result in a couple of hours. These can be rough- with the front o f the fuselage tube. wing leading edge 3/16 inch higher than tapered, from 3 inches at one end to Release it and allow it to expand to the trailing edge. I I /2 inches at the other before wetting contact the other tube, helping it with Finish the fuselage completely, ex­ if desired, although we didn’t. Form a pencil from the inside, until it con­ cept for the installation of the pylon, the tapered tubes around a pool cue tacts the inside ol the body tube com­ by installing the auto-rudder hardware, blank, available from most sporting pletely. Now insert 1/8 x 1/2 inch dethermalizer goodies, and so forth. goods or specialty stores for about three spruce keel, carved to fit the shape of Install the stab and balance the fuselage dollars. Wrap them with clastic athletic the body, and epoxy it in place. The assembly, then install the wing pylon bandage and allow them to dry thor­ aluminum or plywood nosepiece and with epoxy, with the balance point oughly. the hardwood side pieces, hollowed to located as shown on the drawings. With Remove the tubes from the form and accept trim ballast, complete the front Continued on page 66

This view of the underside shows the easily made tow hook and the Close-up of tail shows screw-adjusted stops for auto rudder. One is DT fuse location. Note hole for auto-rudder pin. for straight towing, the other for determining the turn radius.

DECEMBER 1973 43 44 MODEL BUILDER Instigator of the Las Vegas OT bash was Bob Chambers, of the An "Old Ruler" design by Jim Adams, which he calls "Der Flamingo Club. His Sailplane is Orwick powered. Fledermaus." Jim must be an opera lover.

By JOHN POND p m S P A R K S

• Hey man! Got those, “ ya gotta stay at the dry lake located outside of Hen­ . . . no trees or vegetation. Hard to hit home modeling blues?” Is the better derson, the meet features the “ Old anything that way. half making noises about the lawn need­ Ruler” and .020 replica events. While While commenting on the events, ing some trimming, rather than your we are giving credit, some kudoes should the author thought the original intent latest modeling pride and joy? Well, go to )im Adams, who arranged for all of the ” Old Ruler” event was good, the solution is duck soup. Take her to modelers to be housed at Motel 6. This wherein any original design conforming that glittering Bagdad in the desert, enabled the gang to have a joint break­ to the 1940 NAA rules was eligible to Las Vegas. Never saw a woman who fast, followed by a caravan of cars to fly. A loophole in the rules permitted didn't love to pull a “ one armed ban­ the flying site. the use of standard designs with slight d it.” As if the wives didn’t have it good modifications. In short, using a Comet Meanwhile, you can leave (not sneak enough, the original schedule of two Clipper, one could now fly in two out) for the contest being put on by days was reduced to one when it was events, the standard O.T. gas event and the Las Vegas Club. This annual affair found all contestants had completed the new “ Old Ruler” event. O f course, is quite limited in the number of events, their flights in the excellent weather. it is to be recognized the designs were but then, who wants to wear himself This left Sunday and Monday available! allowed to fly to encourage entries in out in the 90 degree heal in the dusty Now you know why the little woman the new event, but outside o f the initial desert and miss the evening activities? likes the Vegas bash! designs by Oslan and Adams, no more Besides, you make points with momma Flying was rather uneventful, with new designs have made an appearance. It like crazy. no real outstanding long flights being is the w riter’s opinion the event should Full credit should be given to Bob registered. Matter of fact, none were be shelved or failing that, the event Chambers, of the Hilton Flamingo lost and very few models damaged. That carried in each old timer contest to Club, for promoting this contest. Held is one advantage about a dry lake bed alleviate the stigma of a “ one-shot” type

The Barrows Gang fro San Diego. (I to r): Dean Walker, Red Barrows, Here's the way to go to a contest! Dean Walker enjoys a davenport and Fred Sykes. Ship is Pond's Cabin Playboy. in the middle of the desert! Look at all that flying space.

DECEMBER 1973 45 FULL SIZE PLANS AVAILABLE FULL PLANS SIZE -72 PAGE SEE

MODEL BUILDER Old Time Eagles President, Woody Woodman, starts engine on Play- Cox .010 powered Micro-Models "Cavalier" built by Daniel Walton. Boy Sr. for Bob Shaw, with transmitter. Woody w ill CD SAM Nats. Famous original design by Ben Shereshaw had 9 foot span. contest model. Anyway, back to the contest. Dunno who won, but in a fun situation like this, who cares?? The writer has nothing but high praise for this type o f meet. Does it ever work wonders on the home front! CONTESTS Old timer contests have been coming so thick and fast lately, the writer has been remiss in attending any of the late ones. Hate to make this column sound like a gripe session, but the North-South meet did suffer heavily from lack of publicity. The idea of this meet is sim­ ply great, with the Yankees and Rebels having at it. Unfortunately, notices of the meet date did not come out until the week of the contest. Certainly didn’t Bob Oslan and his good looking "Old Ruler" leave much time to plan for attendance. Red Barrows w ith his OS .15 powered Megow design. New ship built to old rules. Continued on page 68 Quaker Flash.

Redesign by Wayne Cain GOLDBERG INTERCEPTOR .020 REPLICA Text by John Pond Interceptors come in all sizes with the weeds with careful attention to Wayne Cain, ranging from Cox .020 lightness and a considerable amount of power, to .049, to .09 engines. Wayne flying time on the model. The unsus­ has been coming to the Nationals for pecting writer was led to the slaughter years with his assortment of Intercep­ as three straight max flights resulted! tors. In short, Cain likes that Carl Gold­ Eating crow is rough, as the feathers berg design! Might also mention that stick in your teeth! Cain is no |ohnny-comc-lately to the Last year, Cain again confronted the game, having started modeling back in writer with the same offer, but a bad the thirties. He has had a rather varied case o f gun-shyitis had set in. Bum career in modeling all the way from hunch, as Cain had an abominable streak hobby dealer to salesman. His interest of luck. Starting by dorking his full size in modeling has never quite subsided. Interceptor, he suffered short engine In reviewing the various models Cain Wayne Cain at the Nats w ith a .049 version of the Intercepter. It's competitive w ith today's. runs, bad lift, and finally getting run has, the most surprising thing of all is over by a car (Him, or the plane!? wen). the excellent flying qualities in each The writer had to admit it was with It was indeed Bad day at Black Rock. model and the close similarity o f per­ considerable trepidation that he placed In summary, the wagering ended in formance. Matter of fact, the outstand­ the bet as he had viewed the unofficial a Mexican standoff as neither partici­ ing flight characteristics of the Intercep­ test flights. But wouldn't you know it, pant offered to bet this year. The tors led to some rather hilarious high­ just as soon as the contest got going, the Colonel should hear about those king lights. first flight was a bummer. A little crest­ sized Chickens! What will 1974 bring? Three years ago, Cain was quite fallen, Wayne offered the opinion that Tune in for the next exciting adven­ taken by the consistency o f his models, that flight was a fluke; something that ture! going so far as to say his model could just doesn't happen under normal con­ In discussing the model presented attain three minute flights all day. The ditions. On the second flight, panic this month, no description of how to writer, who has seen many a “ three really set in as the model now hit a build it w ill be given, anyone contem­ minute” model, quickly offered to buy granddaddy o f a “ downer.” Wayne was plating this project should have built Cain a drink for every official three down two drinks. Finally, when all at least one Old Timer. If you have minute registered, and vice versa when seemed lost, the model finally attained problems, let the writer know, we’ll the model failed to produce the desired one good “ max” flight. straighten you out! result. Next year, Cain was really laying in Continued on page 66

DECEMBER 1973 47 Roger Tennyson with a group of "Doolittle Carrier Flyers." This is a David Fitzgerald takes off from the Doolittle carrier. The "Hornet is new .020 carrier event for Junior flyers at WAM contests. 8 feet long, has 4 arrestor lines. Planes are on ten foot lines.

ontrol line By DALE KIRN

• What was the biggest control line no pressure fuel systems allowed. With The “ Carrier” is eight feet long and contest you attended this year (except these requirements, it will allow flyers about two feet high. Landings are for the Nats)? How many planes enter­ to use “ inexpensive” engines to com­ accomplished by stalling the plane (with ed by how many flyers? We attended pete. A lot of fun for considerably less full up) about one half a lap before another WAM contest in Modesto, Calif­ money. making the approach. I saw several ornia (Sept. 23rd) and saw an impressive If you are interested in a complete perfect landings in a matter of a few 415 planes entered by 197 flyers! This set of rules for this event, suggest you minutes. Sure looks like a fun event. was the biggest turnout for a WAM write to: Bill Leonard, 115 Ogontz For further info (rules, etc.) suggest contest this year. There were 80 entries Lane, Oak Ridge, Term. 37830. you write to the promoter o f this event: in the stunt event! Who sez control line CARRIER Roger Tennyson, 337 Greenfield Ave., contests have poor attendance? Can you imagine a carrier event that San Mateo, Calif. 94403. SPORT RACING would cost the modeler from $10 to RECORDS Had a very interesting informative $15 for BOTH engine and plane? Such Roger Barrett (San Diego) recently letter from Bill Leonard concerning an event is now being sponsored by the established a new WAM stunt record in another "unofficial" event that is being 049 'ers o f San Mateo (WAM contests the “ Expert” category with 677 points. flown at many contests in the Midwest. only). It is called the “ Doolittle Carr­ ALL planes flown in WAM contests It is called “ SPORT RACING," which ier Event” and is for .020 powered must have a “ noise lim iting device” , so is a de-tuned version of AMA Rat Rac­ planes. No throttle control allowed. Roger had an ST muffler on his Aldrich- ing. Only sleeve bearing engines permit­ Planes arc flown on 10 foot lines. And reworked ST 40. The tank was pressur­ ted (Maximum o f .36 displacement) and this event is for junior flyers only! ized off the muffler for a consistant en-

Sleeve bearing ST .35 powers Sport Racer by Johnny Tulach. Clocks Neat 1/2A Proto entry by Bill Osborne. This event quite popular in between 90 and 95 mph. WAM contests.

48 MODEL BUILDER Line-up of stunt entries at Modesto, Calif. Only 5 sets of lines allowed Paul Isenhower, President of the Modesto Flying Circus, stands beside in pits at one time, inside rope guides. Very good idea! the custom made trailer for hauling member's planes to contests. gine run. His plane (GYPSY) weighed top (stamped steel) and the muffler engine run too hot because it has a 56 ounces and was flown on 70 feet band (stamped steel). There are two much higher compression ratio. You X .015 cable lines. Prop was a Rev-Up other VERY IMPORTANT parts includ­ will have to add two or three .005 head 10x6 EW and fuel was the New K & ed with the muffler kit . . . a new cyl­ gaskets to get the compression ratio 13 100. inder and piston assembly, and a high compatible with the No. 6 cylinder de­ Jerry Bradshaw set another WAM compression glow head. If these two sign. record in I/2A Speed (Expert) with items are not used, the muffler WILL The Tatone muffler is a two-piece his tuned exhaust equipped Tee Dee ROB POWER from the engine, and casting which is held onto the Cox cyl­ .049. Speed was 105.59 MPH. He is make it very difficult to adjust. inder with two machine screws. It will still experimenting with props and feels The special cylinder has a No. 6 cut the noise level of the engine but will there is a lot more to be picked up here. stamped just below the exhaust opening. also ROB POWER if run on the regular This year has witnessed a bunch o f It has two bypass grooves and no free Cox cylinder. It should be used only in AMA jet records. Latest one was set by port under the piston when it is at top conjunction with the No. 6 cylinder and the team entry of Langlois and Pardue. dead center. The glow head is o f the the 1702 glow head. They turned 195.76 MPH speed (Open) Tee Dee type (Cox part No. 1702). Keep 'em flying . . . QUIETLY. · at Dayton, Ohio, in early September. Early this year, the design o f this glow For many years the jet speeds were head was changed to increase the power slower than the Class C speed planes. o f the Tee Dee engine. It did give more But things have changed now. The jets power, but it w ill make the mufflerized arc outrunning most o f the 60's. Nearly all credit in this area belongs to Myrle Hoyl (Newton, Iowa) and jerry Thomas (Tacoma, Washington). Hoyt produces several jet kits and engine parts. He also lets you "in " on the fuel mixes that make these things go! The days o f white gas are gone . . . Thomas is known for his all metal (aluminum) planes with an upright en­ gine. This plane (Ironsides II) will soon be available in kit form. He also w ill be doing jet engine rework . . . extending tailpipe and head. Another record for Mike Bussell. This junior flyer from Dallas, Texas, has really been keeping AMA busy process­ ing records this year. His latest was in Class A Speed: 153.07 MPH. This record was set in early October at a Ft. Roger Barrett set new WAM Expert Stunt rec­ Kit Gehart (It.) and Bill Leonard w ith their ST Worth contest. ord with hisST.40 powered "Gipsy." .35 powered Sport Racers. See more in text. .049 MUFFLERS Have noticed several modelers having a problem when installing a muffler on their Cox .049 engines. A sudden loss of power and a critical needle valve sett­ ing. This condition will happen when the muffler is put on the WRONG cylin­ der. There are two .049 mufflers current­ ly in production (Cox and Tatone), but neither manufacturer gives adequate in­ structions calling out the importance of the special cylinder that is required when using a muffler on a Cox engine.

The Cox muffler consists of three Cox M uffler Kit (Part No. 495). Three piece assembly w ith special cylinder (stamped w ith a No. parts; muffler housing (alum.), muffler 6 under exhaust opening) and glow head. Last two items VERY IMPORTANT. See more in text.

DECEMBER 1973 49 needs to be adjusted later, so be it. ISN'T IT ABOUT TIME YOU STOPPED BEING A HACKER? The same is true for all other dimen­ sions and values. We’re not designing THE UBER SKIVER WAS DESIGNED TO MEET THE PRECISION RE­ a simple “ thing,” but a “system” . . . QUIREMENTS OF PHOTOFABRICATION, MICROCIRCUITRY, GRAPHIC and hopefully a balanced system. All ARTS PRODUCTION, ETC., AND 4S SUCH BECOMES THE PERFECT elements must be flexible, so to speak, CUTTING TOOL FOR THE DISCRIMINATING MODELER until the total concept is resolved.

Ο Ο Π PAT PEM3. Using the one-third, two-thirds ratio • u.s.A.- for positioning CG in the fuselage envel­ ope, the nose length will be (42 X 0.33) 14 inches, and the tail length (42 X 0.67) 28 inches. Note that these are overall lengths. Therefore, the stabilizer must be contained w ithin the 28-inch overall tail length. If we establish the stabilizer root 11 12 chord as 6 inches and position the stabilizer assembly at the extreme aft end of the fuselage, then the stabilizer leading edge will be (28 - 6) 22 inches aft of the CG. For simplicity, assume 10 15 20 that the quarter-chord point (25 per Rear Draw-Bar Clutch uber Skiver Precision Cutting Tool cent) of the stabilizer average chord 1 Instrument-Quality Materials Available in seven anodized handle colors: (Sea) is coincidental with that of the » Advance Collet Design silver, blue, red,green, gold, copper, violet. stabilizer root chord (Scr). (This would 1 Hex Cross-Section Complete set in fitted hardwood case; includes be true for certain plan forms such as a 1 Deeply Knurled Grip uber Skiver, together with two vials containing constant chord or symctrical taper.) The > Long-Life Stainless Steel Blades 6 No. 11, 6 No. 15, one No. 12, and one tail moment (Ms) would be (22 + 0.25 No. 20. . .A total of 14 blades $1 0.50 See your dealer, or order direct. X 6) 23.5 inches. Dealer inquiries are invited. Individual handles (specify color) S3.95 Pkg. of 6 blades (No. 10, 11, 12, 15, Now we can work the CTv formula. All direct orders sent postpaid or 20) S1.80 Substituting the several example values: CTv = 192 X 23.5/960 X 8 = 960 X 8 # ...... Keep in mind that a coefficient is a MODEL BUILDER PRODUCTS dimensionless value which means the only way you can measure it is by the 1900 E. Edinger Ave., Santa Ana, California 92705 degree of warmth or chill in your stomach when said value is compared R/C Soaring . . Continued from page 13 two ways . . . simple enough for even to an acceptable known. A nice, big Wing area (S) is span (b) times average your Old Flying Buddy or with enough conservative CTv would be around 0.75, wing chord (Wca), 120 X 8 = 960 number juggling to keep your Junior while any design less than about 0.40 square inches, or (960/144) 6.67 square Einstein away from the used hub-cap might be considered to be a “ p ilo t’s feet. market for an hour or so. If you insist sailplane." The 0.59 in the example While we’re here, we might as well on doing it yourself, multiply the wing would be quite acceptable. touch on Aspect Ratio . . . a Irequently area (S) by 20 per cent. From previous For comparison, the melmac Cirrus used term that any designer worth his data, that would be 960 X 0.20 - 192 has a CTv of 0.64. The Yankee Gull/ Berlitz German recordings w ill work square inches stabilizer area (Ss) for the 1440 has a CTv of only 0.42. Both arc into every sentence. Aspect Ratio (AR) design example. quite stable and docile in pitch. A more is the relationship o f length to width .. . The more complex approach consid­ conservative design, Frank Zaic’s new or span (b) to average chord (ca). In the ers Tail Volume Coefficient (CTv). In Floater, has a CTv o f 0.69. The Midwest 10-foot span example, AR is b/ Wca, this case, stabilizer area is not considered EZ Juan's CTv is 0.54. 120/8 = 15, or properly noted, 15:1. independently, but rather in conjunction Obviously, a range o f CTv values is AR can also be calculated as b2/S which with tail moment (Ms), as well as average acceptable . . . and flyable. It's just that is (120 X l20)/960. Comes out to be wing chord (Wca). The formula for all automatic pitch stability may vary from 15, but seems like the hard way. That this is: "ya got to be on it all the time” to “ if long division is rough. (CTv) = (Ss) X (Ms)/(S) X (Wca) ya get in trouble, let go o f everything.” An AR o f 15 for an R/C sailplane (CTv) Tail Volume Coefficient Other factors also effect pilch stability, wing is a reasonable value, but anything (Ss) Stabilizer Area but the subject is CTv for right now. from 10 to 20:1 is acceptable. Free- (Ms) Tail Moment Several popular and highly success­ flighters get down as low as 6:1, and (S) Wing Area ful domestic designs might be considered some models and many full-scale sail­ (Wca) Average Wing Chord to be under-stabilized by the above planes stretch to 25:1 and beyond. standards, and some do require a bit of Chances are that 12 to 18:1 is a good To this point, we’ve talked about familiarization for low-time pilots. But bracket for R/C designs. tail moment (Ms), and even indicated they arc flyable, and in the hands o f an With span, area, and the several its approximate position on the ref. experienced pilot, they fly very well. wing chord lengths defined, there’s line. But it’s time to get serious. A real Might even say that especially in the enough information to lay out the dimension for Ms must be established in hands of an experienced p ilo t.. . but we wing plan form. I t ’s just a matter of order to calculate the value of CTv. won't. drawing. Assume overall fuselage length to be In the Tail Volume Coefficient for­ The next order of business is the 35 per cent ol wing span. This is strictly mula, any o f the four contributing horizontal stabilizer. We know where it an arbitrary but reasonable value, and values can be varied to obtain any given is . . . a distance Ms behind the CG . . . works out to 42-inches for a 120-in. coefficient value. Several sample calcu­ but yet to be determined is just what it span. Remember, nothing about the de­ lations may be performed before you is. This can be approached in either o f sign is firm yet. If the fuselage length find the balance of dimensions and

50 MODEL BUILDER areas that are suitable. And that’s typ i­ cal design activity . . . trial and error, adjust and correct . . . on paper. Beats hell outa building a lot of bad parts. Some o f those may creep in anyhow. Now some wise guy in the back of BOEING 247 the room is going to bring up the point that certain wing airfoil sections are more stable than others, and that this airfoil stability factor should be con­ sidered in evaluating the CTv. The kid’s got a point . . . but that’s hard. Just keep in mind that, basically, a flat bottomed airfoil is more stable than an undercambered section . . . so, lower CTv values are workable with flat bottomed wings whereas an undercam­ bered wing might better have a CTv in the higher ranges. And sections such as are utilized on flying wings don’t hardly need no tail at all. Sit down kid. NEW! 1/72 SCALE MODEL KIT FOR THE WORLD S FIRST REALLY MODERN To play with numbers just a little AIRLINER. MAY BE COMPLETED AS EITHER COL ROSCOE TURNER'S RACER more, take a couple of other examples. Assume all other factors are constant, OR A 1933 UNITED AIRLINER. FORERUNNER OF TODAY'S TRANSPORTS, THE but use stabilizer areas o f 15 and 25 per BOEING 247 INCORPORATED SUCH ADVANCED FEATURES AS ALL-METAL cent. CTv works out to be: (0.15 X CONSTRUCTION, RETRACTABLE LANDING GEAR, DE-ICERS, AND C O N ­ 23.5)/8 = 0.44 and (0.25 X 23.5)/8 = TROLLABLE PITCH PROPELLERS. SEVERAL OF THESE AIRCRAFT REMAIN 0.73. Now, with three different stabili­ OPERATIONAL TODAY. k i t f e a t u r e s : t w o t y p e s o f windshields zer sizes, 15, 20 and 25 per cent of wing LANDING GEAR MAY BE INSTALLED · SOFT LANDING GEAR TIRES IN ANY OF THREE POSITIONS: · CLEAR PLASTIC DISPLAY STAND area, adjust Ms to 30 inches. TVc be­ • RETRACTED -DECALS FOR BOTH RACING AND AIRLINER VERSIONS comes (0.15 X 30)/8 = 0.56, (0.20 X • STRUTS EXTENDED · TURNER S LONG-RANGE FUEL TANKS 30)/8 = 0.75, and (0.25 X 30)/8 = • STRUTS COMPRESSED · TRANSPORT PASSENGER SEATS PRICE: $4.95 0.94, respectively. It all kind of works SEND 25c FOR COMPLETE ILLUSTRATED CATALOG out like if ya got a skinney kid, set him way out at the end of the teeter- IaÍíllÍams DEPARTMENT MB · 181 B STREET totter. J ssos: _ SAN MARCOS, CALIFORNIA, 92069 Once the stabilizer area has been es­ tablished . . . based on an acceptable CTv . . . and an average chord for the “ ' Ρ Λ Μ ' ΐ ε ΐ Ζ stabilizer has been set, stabilizer span is Designed to be your firs t large R/C soaring glider. Aerodynamically forgiving. determined by dividing area by average Controlled Free Flight characteristics. In a tight bind, just release the chord. Some adjustment may be re­ controls and the FLOATER w ill assume stable flight. Short construction quired to get a reasonable shape. An time. S tructurally sturdy. All plywood fuselage design, perfect for spot aspect ratio of about 4 or 5:1 is fine. landing practice. In a collision with terra firma, the FLOATER will If a conventional fixed stabilizer- just wiggle its tail, ready to fly when you are. After you and the movable elevator arrangement is plan­ FLOATER know each other well, you can reach for higher dreams, ned, put the hinge line at about the 70 like w inning contests, setting new records, LSF, etc. per cent point. That is, "fla p ’’ the back At your dealer or direct 25 or 30 per cent o f the total stabilizer $34.50 $1.00 P. P. Cal. Res. 5% area, and call it the elevator. Need extra fuselage/stab? Wing? All this scientific stuff may get too Can be had separately @$17.50. heavy. If so, relax and go the 20 to 25 per cent o f wing area previously dis­ ,/(/!/f,‘f/ Box 735 cussed. Besides . . . and if you’re really serious about all this . . . you may want Northridge,Cal. 91324 to build and fly a couple of different tion with a positive chamber line . . . Maybe 90 percent o f that calculated for stabilizers to see what really works best which means it ’s curved on top and is a symetrical and/or flat section per the for you in the air. Might start o ff with either flat on the bottom or has a con­ formula. a 20 percenter, but have both a 15 and cave lower surface. The reason that the Since we’re working the tail/end 25 per cent unit available and inter­ term "liftin g ” is sorta dumb in this problems, might give some thought to changeable. Don’t feel that you’re a context is that any section used for a the vertical surfaces . . . the fixed fin failure if it takes this kind o f flight test­ stabilizer has to "lift" or it just don’t and movable rudder, which collectively ing to get the final configuration fixed. stabilize. There may be a lot o f EBS are referred to as the rudder. Ask Boeing, Lockheed, or McDonald- floating around about “ lifting ” stabili­ Most everything that has been said Douglas . . . listed in alphabetical order. zer sections, but there’s pretty good about the horizontal stabilizer is also One final point regarding stabilizers argument that they offer little advantage valid for the rudder except that it has . . . that o f airfoil sections. Probably the and perhaps some disadvantages . . . nothing to do with pitch stability. Oh, most efficient shape is that of a symer- like maybe tending to hold the tail up there’s a crossover point such as in a trical section o f around 8 to 12 per cent .. .and nose down . . . under some flight steep bank where the functions of thickness. However, a flat section is conditions such as in a dive. Where you rudder and horizontal stabilizer inter­ acceptable and may be almost as good. don’t hardly need that kind o f help at change, but no need to get into that. Some designers prefer a "liftin g ” sec­ all. But, if a so-called lifting section is The rudder’s capability to guide and/ tion. What they mean by that is a sec­ used, a lower CTv should be acceptable. or turn (yaw) the aircraft is dependent

DECEMBER 1973 51 rudder sits directly above the horizontal stabilizer . . . therefore Mr is the same as Ms . . . we can work the problem: CRv = 77 X 23.5/960 X 8 = 0.24 A CRv of 0.24 is a workable value within a reasonable range o f from 0.18 to 0.29, give or take. For comparison, CRv for some existing designs are: Cirrus 0.29 Yankee Gull/1400 0.I5 Zaic Floater 0.22 EZ Juan 0.28 From here on in, we get by the com­ plex interactions by either eye-balling or by spending the next flying season on paperwork. To hell with it, let's eye-ball it and then go flying. The CRv can . . . and should . . . be increased from formula value to allow for extra long wings (b greater than 5 Mr); to allow for deep fuselage contours or, conversely, reduced for the really skinny jobs; and reduced in considera­ tion of dihedral in excess of 7 or 8 degrees per panel . . . or for polyhedral. Chances are that an allowance of 0.02, plus-or-minus, should work pretty well ...and bought all we produced ol the for each of the noted variants. )ust for \ / f ' ^ f i ln order to meet the continuing demand practice, the calculated example might V * V 3 for this engine we stepped-up our sched- be adjusted as follows: ule and they are available again at your Calculated CRv 0.24 4 Γ 3 / favorite hobby shop. bless than 5 Mr -0.02 m g / V M The Veco .19R/C “Series 71" with its Real Skinney Fuselage -0.02 ' hemispherical head machined from solid Polyhedral -0.02 “Ο λ |» ϊ λ ο 7 1 ” aluminum bar stock, has become a real Revised CRv 0.18 1 ^ 0 # I favorite. It has extra deep fins providing If the established Mr is to be held, cooler running and increased power, exhaust valve control (rotary and assuming S and Wca are firm, then type) linked to carburetor for smooth idle, and precision ball bear­ Sr can be adjusted to reduce the original ings. The machined surfaces of head and crankcase eliminate the CRv value (o.24) to the revised value need for gaskets. These features make the Veco .19R/C “ Series 71“ (ο. 18). Rearranging the formula: the most asked for power-plant for boats as well as planes in its Sr = CRv X S X Wca size range. Mr If racing is your “ bag"... install the “squish band" racing = 0.18 X 960 X 8 head ...... $4.00 23.5 = 59 square inches For those who find race cars more to their liking there is the But again, only flight tests will tell VECO .19R/C “ Series SM” which has all the features and power of for sure. Since the fin probably w ill be the VECO .19R/C “ Series 71." Designed exclusively for side-winder fixed permanently to something or mounting with fins on head in line with forward motion of car $33.00 other, any modifications for final sizing can be made to the hinged rudder . . . especially if the change is an increase. K&B MANUFACTURING Incidentally, a movable rudder area of DIVISION OF AURORA PROOUCTS CORP about 50 to 50 per cent o f total Sr is 12152 WOODRUFF AVE DOWNEY. CALIFORNIA 90241 in the right ballpark. Too much don’t hurt bad . . . and more's better’n less. upon several factors: wing span, dihe­ lated the same as were similar factors for Most prominent designers prefer the dral, fuselage side area, rudder moment the horizontal stabilizer. Figure that Mr rudder to be located aft of the fin. No (Mr), and rudder area (Sr). Probably the is the horizontal distance from the CG reason to get ingenious here. most expedient manner in which the to the 25 per cent point of rudder If you’re thinking about v-tails, fine, complex interaction of these several average chord (Rea). just consider the “ stabilizer” part as factors can be handled is to ignore the The CRv = (Sr) X (Mr)/(S) X (Wca) that which you’d see if looking straight whole mess. At least almost. (Sr) Rudder Area down on the assembly, and the rudder As with the horizontal stabilizer, rud­ (Mr) Rudder Moment as that seen looking straight in from the der area (Sr) can be developed by a (S) Wing Area side, times two. All the above areas and simple mathematical calculation or you (Wca) Average Wing Chord stuff would then apply. The included can fill a page with ciphers. Now somebody might notice that angle o f the v should be some place First things first. A reasonable value the formula doesn’t cover all the factors between 90 and 120 degrees. for Sr is 8 per cent of wing area (S). listed a couple of paragraphs back, but The next order o f business is that o f Using example values, Sr would be we’ll get to them. Right now it’s exam­ selecting a wing airfoil section. Probably (0.03 X 960) 77 square inches. ple time for the CRv formula. the greatest boon to the amateur sail­ A rudder moment (Mr) and a Rudder Using the value o f Sr developed on plane designer/brain surgeon is that Volume Coefficient (CRv) can be calcu­ the percentage basis, and assuming the practically no airfoil theoretical data are

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•Dry Kit. Rubber power material supplied. Other power and equipment not included.

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Her# it i$! The mode) International in μ P °ne *hat became a living legend! Sweeping a King Orange or 30 feet off the e*ectr'fied the crowd, flying in formation, doing 8 pt. rolls just 20 creative croftsmanjhi00^ 9«nius of Phil Breittling together with Sterling's unsurpassed design radio model 'P COm^'ne to now bring you what is probably the most advanced seen it . . now v q . .,n ex^«nce today! You've heard about it . . . maybe you have even Phil Breittling's Legendary responsive radio C°,n Unquestionably, the F-51 Mustang is the most realistic, most . control model in the air todayl finest plywood°»le** 66 inches tip to tip, with a 50" fuselage, of selected balsa and sidesl Custom-sh ° Ut* c^ec^ f bese exceptional features! One-piece 4 5 " balsa F-51 MUSTANG . · . shaped hard^ r VPper anc^ !<>wer cowl blocks, air scoop . . . shaped motor mounts fuel-proof V " th 'T °i W.'n® *P°r! Giant crystal-dear canopy almost 14" long, made of KIT FS-10 formed landin C p Ql,'c· Special landing gear clamps of hardened steell W diam eter Wing Span 66" $ 95 bell cronki rtn/ik9ear/ struts individually mountedl Permanently brass-bushed plywood For .35 to .60 I η i orn*, ηοί Ιυ*ϊ bolted on but built right in! Wing flaps operable with engines a ir i e<^u,Pmentl 158 different parts in the hardware package! And the largest 54 o.r force decals you ever saw in a n y kit! May also be flown as control line model . . instructions on planes. hv L*ep Plans o re a work of art, with every phase of the assembly covered WHEN IT'S MADE BY STERLING, IT'S ■ w ' U ·, ®,c”ei or>4 detailed instructions. Plans also show how to build the Mustang into a beautiful control-line model. GUARANTEED . . . IN WRITINGI

FRANNY'S CHROME available which are suitable for use in (flat-bottomed). Mavbe even better. MODEL ENGINE SPECIALISTS the design of R/C sailplanes. The reason But the champions of all the cham­ that this is a boon is that it makes the pions are those designers w ith a built-in selection o f an airfoil so uncomplicated. EBS factor who modify defined wing Nobody has adequate low-speed data, so sections, but continue to use the sec­ it’s really a contest o f who develops the tion’s original designation. And watch best EBS to support his claims. out for the guy who calls every flat- Many designers seem to feel that an bottomed airfoil a Clark Y. It just undercambered section provides better ain’t so. duration performance in still air, and Now how does all this help in the that a flat-bottomed section has the selection o f an airfoil for any given advantage in a wind. Others will argue design subject? Look at it this way. If far into the night that no undercam­ there were only two sections available bered section is worth the extra build­ in the whole world, and they were the Hard Chrome, Hop-up, Fuels, ing complexity. Still others subscribe Clark Y and the NACA 6409, the per­ Engines, Parts. List 25i to the Italian or French shoe concept, formance of R/C sailplanes might never and develop their airfoil sections by show any significant variance from what 513 Vesta Place Reading, Pa 19605 tracing around the sole of their newest we attain with a selection from thou­ NEWLY MANUFACTURED dancing slippers. How sweet it is! sands. So relax. If the decision gets to Probably the champion EBS-for-air- disturbing your afternoon naps, copy 1/4 X 32 SPARK PLUGS the section used on some existing design. Now you can once again run foil designers are those who capitalize youry UU i oldU i u ignitioni ^ m i i v " enginesν · '^ ι· ·νυ and on specific designations, but incorpor­ It ain’t cheating. Where do ya think it - join the Old Timer movement. ate significant personal modifications came from? S2.25 ea., plus 50d postage . . . like changing a highly undercam­ The incidence angles o f wing and CO IGNITION ENGINES bered section to a flat-bottomed con­ horizontal stabilizer are not products SUPER CYCLONE figuration. These hybrids usually are of black art. Each is defined with respect $40.00 assigned nomenclatures such as NACA to the ref line, which is considered to ANDERSON SPITFIRE 6412 (flat-bottomed), or Eppler 385FB. be 0 degrees. The difference between $50.00 the two angles is important but not too ($ 1.00 postage per engine) One guy even came up with a “ Laminar Y.” This is not to say that any one of critical so long as the wing angle of COILS, $550 such airfoils is not useful. Some seem incidence (Wi) is more positive than CONDENSERS, $1.00 to be as good or better than most. Just that of the stabilizer (Si). About three List, 25< Dealer inquiries invited. don't be impressed by the fancy sound­ degrees is a good, garden variety differ­ COMING SOON...New .29 ignition engine. ing titles. These sections would work ential. REMCO m f g . CO. just as well if referred to as a Swartz 9, There is a problem as to just where P.O. Box 22414, Denver, Colo. 80222 a Florshiem IOC, or a Maidenform 34 the Wi should be measured. There seems

MODEL BUILDER 54 INCOMPARABLE CONTROL! INSTANT RESPONSE!

to be three distinct schools. School the root section should be drawn on number one, such as represented by the the force model in its appropriate posi­ NACA (now NASA) reports, measures tion relative to the Wca. Good things come the angle at the section chord line . . . Having set the wing incidence a +3 in many packages. which is a straight line running from the degrees, the horizontal stabilizer can be We make over 160 center o f the airfoil section’s leading set at 0 degrees. The idea here is that vario u s model accessories for edge through the center o f its trailing with this angular differential, the stabili­ Radio Control, edge. The number two school would zer (a) will be streamlined . . . flying at Free F Iig h t and make the incidence reference line the 0 angle o f attack and/or zero lift . . . U -C o n tro l. ordinate line used in plotting the airfoil under normal flight attitude; (b) will Tatone Products shape. That's fine and it happens to increase its lifting force in a nose-high are at all dealers. be one and the same with the chord attitude and thereby raise the tail o f the I f no hobby shop is convenient, send line for NACA sections, but not neces­ sailplane and restore horizontal flight; 25< for illustrated sarily so for other sections such as the and (c) will provide a downward force ca ta lo g . Clark Y and the Eppler and other Euro­ in a nose-low situation and thereby pean plots. The third, middle-of-the- force the tail down and bring the sail­ TATONE PRODUCTS road school utilizes a double standard, plane back into a horizontal path. referencing the chord line on under­ The exact and preferred differential chambered sections and the bottom setting between Wi and Si on any given contour line on flat-bottomed sections. design can only be established by flight FLYLINE MODELS Take your pick, but the latter is really tests. Best idea is to incorporate an ad­ PRESENTS THE FIRST IN A SERIES OF the easiest to use in most cases. Don’t justable stabilizer. Don’t try to take care C L A S S IC S IN 3 4 A I INCH S C A LE let it bother you that a bottom contour of this by elevator setting. It ’s ineffi­ incidence measurement on a flat-bot­ cient and it limits control movement HØf. ^ia*tocaufie around "zero.” tomed wing surface would be about 2 or r 22 V2~ w in GSPan FOR Note that the important relationship RUBBER. C02. OR 0<0 POWER A BIT 3 degrees less than a chord line inci­ OF NOSTALGIA ANOA OELKJHT T0 6UILO «a OS dence measurement on the same sec­ is that of Wi and Si . . . not Wi and the A N D C O M IN G SOON: “ tion. It seems to work out all right. fuselage ref line. Except for slight differ­ The historic Location of the wing on the force ences in drag due to fuselage attitude B i l l a n c a model that we started about a month during normal flight, the Wi could be 0 S k y r o c k e t ago is a matter of drawing an airfoil degrees and the Si -3 degrees, and flight 34 1/2 WINGSPAN. .020 POWER FOR PULSE ANO SMALL MlATi RADIO CONTROL UNITS reference line so that the 25 per cent characteristics would be no different CAN BE FLOWN FREE FLIGHT ON RUBBER POWER point o f Wca falls on the vertical line than the +3/0 degree setup. Set a A U KITS INCLUDE TOP O U A lirv PRINTCO BALSA. SCALE WKELS. DECALS AND SUPER DETAIL FLYLINE MODELS which represents the center of lift (L), “ lifting” stabilizer a couple of degrees nu.*«»»«»«M T -.o m j a s h b y PL at the desired angle o f incidence . . . say more negative so as to have about a 5 •SEE YOUR LOCAL HOBBY DEALER* FAIRFAX.VA + 3 degrees. For construction purposes, degree differential. That’s because a iiMoMAMNavio· 6*srov%no»»«»»e ______

DECEMBER 1973 55 drag and drag means sink, so it’s usually a good plan to keep things as slim as is comfortable. Remember to leave room for the radio gear or you may be an entrant in the next Nordic contest. Structure? Another entire subject, and an easy one to bone up on by checking the designs of others and stealing what you like best from each. Use lotsa balsa, ply, and fiberglass in the fuselage forward o f the CG for strength and functional ballast. No point in giving a bunch of dumb lead a free ride in the front end o f a flimsy model. Wing spars o f spruce are nice. While you’re designing the various component structures, keep in mind that straight lines are keen . . . curves are hard. Ya gotta build it, use it, and maintain (repair) it. Don’t get hung-up on “ super-light.” Lightness ain’t every­ thing. It’s got to hold together, too. As for wheels, brakes, spoilers, flaps, ailerons and all that jazz, save something for Mark II. Mark I will fly, but it might be Mark II before you humble the world with your genius. Don’t use it all the first shot. All you have to do is iron it on and it's ready to fly. And that’s it. Get in there and give it Coverite is the only covering that requires no paint a go. Read everything you can get your whatsoever AND IS TRULY TEAR, SCRATCH AND hands on. There’s some pretty good stuff being published these days . . . PUNCTURE RESISTANT. some even has to do with R/C sailplanes. Also, unlike other iron-ons, Coverite can be easily and It should improve your designs, but expertly painted to any color or glass finish. Ask cham­ even if you don’t use it, the informa­ pions like Moucha, Titus and Vandever why they used tion you obtain will upgrade your EBS Coverite to win many major contests. output. That’s important, because in the final analysis, the greatest difference be­ Ask John Roth why he chose Coverite for his 1st place tween one good sailplane and another is winner at the 1973 Nats. Ask your dealer to show you in the skill o f the pilot. So if ya can’t the Coverite line. Once you try it you'll use it forever. fly, drown ’em in . . . esoterica. Fley, it’s Recess!

Heathkit.... Continued from page 7 pany even has a few non-electronic This Volksplane covered items, including a trail bike and an R/C with Super Coverite race car, and at one time, was investiga­ won 1st Place at ting the possibility of kitting a full size the 1973 Nats in Oshkosh. automobile! The builder is John Roth. In spite o f the variety of items, there has always been one characteristic con­ sistent with all kits produced by Heath; COVERITE any individual with the ability to read Jenkintown, Pennsylvania, USA and follow step-by-step instructions (checking o ff each step as it is accom­ lifting section starts doing its thing . . . Opinion is that strong and divergent. plished) and to handle simple basic tools lifting . . . at angles slightly less than 0 The emcee and guest speaker will re­ such as pliers, wire cutters and strippers, degrees. member you for years. screwdrivers, etc., . . . and most o f all, a Dihedral can be covered quickly. For Bend the wings up the way you soldering iron . . . can build anything conventional “ V" dihedral, about 7 +-1 want . . . it ’s your sailplane. Also, Heath sells in kit form. With no know­ degrees in each panel will be adequate. you’ll be a happier hooker o f thermals ledge of electronics prior to, during, or Add a degree or two for forward swept if you put in 2 or 3 degrees of washout after completion, this writer has, over wings, and reduce a similar amount for in each wing tip. the years, built and successfully tuned, sweepback. For polyhedral, something Plan on the lowhook being just a operated, and serviced Heath kits for around 5 degrees on each inner panel little . . . half-inch or so . . . forward of AM and FM tuners (stereo and mon­ and an additional 15 ^5 should put you the CG. A second location an inch or so aural), several amplifiers, test meters, in a safe range. further forward could help early test tape systems, record players, a color You can get a good argument started flights be more fun. TV set with remote controls, and three by making loud statements in favor o f About all that’s left is to put a pretty different R/C systems. Although we either V or polyhedral at the next soar­ outline around the design force model. have operated LEGALLY on a six ing banquet you attend. Chances are If ya got any taste at all, fuselage pro­ meter Technician’s License (W6-MGK) the whole evening w ill become a sham­ portions will be okay, so don’t sweat it. since 1960, we only obtained the ticket bles. Might even get loud . . . and active. Might remember that frontal area means after a great deal o f coaching and just

56 MODEL BUILDER Build either of our great 8-channel systems and it's Christmas all year round. Order transmitter, receiver, bat­ tery pack and four servos as a package, and you save another $34.70 off the already low kit-form prices. There are eight independent channels in a package no bigger than conventional full-house transmitters. Exclu­ sive Heath-designed IC encoder circuitry does the trick. There's an IC decoder in the matching receivers, too, that trims weight there. Choose either single or dual-stick control in 27, 53 and 72 MHz operation — with adjacent frequencies at no extra cost. Both transmitters have a two-position switch for landing gear, finger adjust tabs for auxiliary channels; trainer link jacks and “ buddy button” ; external charging jack for simultaneous charging of receiver transmitter and re­ ceiver batteries; eight range controls for adjusting servo travel. Systems include: 8-Channel Transmitter (select either GDA-405-S Single Stick or GDA-405-D Dual Stick). Re­ ceiver (specify GDA-405-2). Battery Pack (GDA-405-3). 4 Servos (GDA-405-44, GDA-505-44, or any combination equaling 4). Complete Single Stick System, 10 lbs...... 269.95* Complete Dual Stick System, 11 lbs...... 249.95* And both systems include all batteries.

This year give yourself a super-slim Heathkit GDA-1057 3-channel System. Then next Christmas make it 4-chan­ nel. All you'll need is the GDA-1057-4 Modification for transmitter and receiver. There are three special system prices to make this one of the nicest holiday packages ever. The Heathkit GDA-1057 System uses the flight proven circuitry found in the popular Heathkit GD-19. The GDA- 1057-1 3-Channel Transmitter comes with a 2-axis stick assembly. Add the GDA-1057-4 modification and put 3 channels on the stick with the fourth controlled by a thumb tab. The GDA-1057-1 Transmitter is available on all R/C frequencies, and is housed in a slender new case for positive one-hand action during launch or engine adjust­ ment. SPECIAL SYSTEM PRICE =1 - GDA-1057-1 3-Channel Transmitter, GDA-1057-2 Receiver, GDA-405-3 Receiver Battery, two GDA-19-4 Standard Servos, 8 lbs. . . 139.95* SPECIAL SYSTEM PRICE =?2 — Same system as above, substituting GDA-405-44 Miniature Servos, 8 lbs. 149.95* SPECIAL SYSTEM PRICE - 3 — Same system as above, substituting GDA-505-44 Sub-miniature Servos, 8 lbs...... 149.95* Kit GDA-1057-4, 4-channel modification for both trans­ mitter and receiver, 1 lb...... 19.95* Specify frequency when ordering.

SEE THEM AT YOUR NEAREST HEATHKIT ELECTRONIC CENTER. . OR SEND FOR FREE CATALOG (------h e a th ------]

^HEATH COMPANY, Dept. 238-12 HEATHKIT ELECTRONIC CENTERS Benton Harbor, Michigan 49022 Units of Schlumberger Products Corp ARIZ.: Phoenix; CALIF.: Anaheim, El Cerrito, Los An­ □ Please send FREE Heathkit Catalog. geles, Pomona, Redwood City. San Diego (La Mesa), Woodland Hills; COLO.: Denver; CONN.: Hartford □ Enclosed is $______, plus shipping. (Avon); FLA.: Miami (Hialeah): GA.: Atlanta; ILL. Chicago, Downers Grove; IND.: Indianapolis; KANSAS please send model(s)_ Kansas ■ City (Mission); LA.: New Orleans (Kenner) MD.: Baltimore. Rockville; MASS.: Boston (Wellesley) Name_ MICH.: Detroit; MINN.: Minneapolis (Hopkins); MO. St. Louis; N.J.: Fair Lawn; N.Y.: Buffalo (Amherst), A ddress- New York City, Jericho; L.I.: Rochester; OHIO: Cin­ cinnati (Woodlawn). Cleveland; PA.: Philadelphia, City______Sta te - _Zip_ Pittsburgh; R.I.: Providence (Warwick); TEXAS: Dallas. •Mail order prices·, F.O.B. factory. RC-104 Houston; WASH.: Seattle; WIS.: Milwaukee.

DECEMBER 1973 57 CLEAN YOUR ENGINE G O ULTRASONIC!! THE SPACE-AGE WAY FOR THE ULTIMATE IN ENGINE CLEANING, CHOOSE A "BRANSONIC" ULTRASONIC CLEANER TANK. VERY USE­ FUL FOR CLUBS, OR OWN ONE YOURSELF. IT ALSO CLEANS JEWELRY, UTENSILS, DRAWING PENS, PRECISION PARTS, MECHANISMS. M A — — MADE OF STAINLESS STEEL. SOLID STATE CIRCUITRY.

k · · 1 t------r a Cleans more thoroughly ' 5=5 Γ than any other method. V. REVITALIZE THAT CRUDDY ENGINE AND MAKE IT LOOK LIKE NEW !! L· MODEL FRANNY S CHROME ENGINE SPECIALISTS Send self-addressed, stamped 513 VESTA PLACE envelope for further details. READING, PENNA. 19605 DEALER INQUIRIES INVITED

I CLOUDBUSTER RACE WINGS I and sailboats . . . and for cars, if you don’t mind stick-steering. By adding the 4th channel, which converts the 2-axis stick to 3-axis with a rudder control knob, one may have separate controls for rudder and ailerons on aircraft. (Some power boaters also rig up rudder and aileron servos to the boat's rudder tiller in order to have full and partial turn control). Car steering RUBBER SCALE PLANS FOR SIX (6) also becomes more realistic. FLIGHT-PROVEN, RARE & UNUSUAL The GDA-1057 receiver is a two-deck RACING PLANES: CROSBY. FLOYD BEAN, TWO FOLKERTS, SMIRNOFF layout enclosed in a plastic case 1-3/16 BEARCAT, and CHAMBERMAID. inches square by 2-1/4 inches long. A Complete set, postpaid, only S4.00 connector block at one end receives order from: direct cable connection from the servos CLOUDBUSTER VENTURE and the switch harness. P.O. Box 2921, Livonia, Mich. 48154 As previously mentioned, the price of the GDA-1057 includes 50 mAh barely passed the test on dumb luck nickel-cadmium battery packs for both circuit decks, one each for the R.F. and (The questions were multiple choice receiver/servos and transmitter. Charging the decoder sections. A total o f fifteen and the coin was red hot that day!). We of both packs is accomplished simul­ resistors, six diodes, and three ceramic mention this only to convince you that taneously by an exterior (and safer) IF filters share space on the two boards, any knowledge o f electronics is purely transformer type charging unit. along with a varied assortment o f resis­ coincidental and if anything, detrimen­ tors, capacitors, choke filters, and so on. tal (you’re liable to anticipate instruc­ Our particular unit is on 53.3 MHz, includes the 4th channel conversion, The job of installing and soldering the tions, miss a point that seems minor to parts in their respective locations is you, and goof up). and uses the sub-miniature, 3-wire ser­ vos. Equipped with our Wahl recharge­ more tedious than difficult, and again, The GDA-1057 transmitter is a de­ able soldering iron, wire cutter/strippers, it’s mostly a matter of carefully identi­ parture from the usual cigar-box shape a pair of tweezers, needle-nose pliers, fying the various components and put­ of today's units. Old time R/C’ers may and a small screwdriver, we completed ting them in the right spot. About the be reminded o f the early Citizen-ship the transmitter in 3 evenings, working only way you can go wrong is if you’re unit which was often described as look­ about 2-1/2 hours at a sitting. Although color blind when it comes to identify­ ing like a “ square flashlight.” “ South- the instructions caution you to charge ing resistor values. Those orange and Paw” R/C’ers will really appreciate the the transmitter pack prior to operation, red bands, or the green and blue, can layout as it readily lends itself to being we couldn’t resist the temptation to look an awful lot alike . . . even to a operated either left or right-handed. In give it a quick shot to see if it would good pair o f eyes. addition, an adjustable hand strap on work . . . it did. Building the receiver and the switch the back provides extra one-hand hold­ Next came the wiring of the air­ wiring harness took four evenings. ing power. borne pack and then the transformer Next, we went back to the trans­ As a 3-channel unit, the control operated dual charger. Once these were mitter, now with fully charged battery stick is two-axis, with the third channel completed (about an hour), we put pack, and went through the test and ad­ being a full trim tab on the right side of everything on charge and attacked the justment procedures. In all of the ensu­ the case. This makes it a dandy control receiver. ing steps, the transmitter output meter system for powered aircraft on rudder, The GDA-1057 receiver, like its big was used. After tests were completed, elevator, and throttle . . . for gliders that 8 channel brother, the GDA-405 (not and the receiver tuned, the meter was may also have flaps and/or spoilers, physically larger, just more stuff permanently installed in the transmitter. and/or air-brakes . . . for R/C power crammed inside) is built on two printed Seeing each step of the checkout go as

58 MODEL BUILDER CONFIDENCE Orbit flyers have it. SO DOES JONATHAN LIVINGSTON SEAGULL

WHEN THE PRESSURE'S ON WHEN PERFECTION IS AN ABSOLUTE REQUIREMENT THE KNOWLEDGABLE FLYER^CHOOSES ORBIT.

Although mostof^he sequences in the Hall Bartlett production

of Jonathan Livingston Seagull used R%e birds, cerfáin "v

special" sentiences required a "very special" seagull. Mark

• * %' ’ S Smith, of Mark's Models, was given the difficult task of

designing, building, and flying a glider that would look and «* * soar enough like a live seagull to fool the cameras, and he had

to choose the best foi^the job. He chose Orbit.

As Mark tells it, "Fiást I had to maře the glider look realistic.

Unfortunately, a glider staffed like a seagull doesn't lend Itself

, fe 9 Mark smith to conventional glider controls so I Had to learn to fly all over and "Jonathan* again. By the time we started filrdi ng, my Orbit W gd#* at Torre? Pines, v California through more of a work-out than any radio deserves.'

Mark also described the problems of the "crash scenes", when he would pick up the pieces of one seagull,

put the radio in another one, and go on with the next scene. "A camera crew on location costs thousands of

dollars a day, says Mark, "so the pressure on me not to be the cause of any delay was tremendous. During

the filming, shooting for hours on end, Jonathan Livingston Orbit never "glitched" even once. I was able to

concentrate entirely on making him fly perfectly. When you see the movie, I don't think you'll be able to

tell the real seagulls from my models, except that real seagulls can't do what I make Jonathan do."

Orbit Electronic· 1641 Kaiser Ave.. First in R/C Technology since 1954. Santa Ana. Ca. 92705 in Canada: CRC Electronics, 60 Nugget Ave.. Agincourt. Ont

DECEMBER 1973 59 PROFESSIONALLY SPEAKING . . . Isn't it about time you moved up to the winner's choice? Well, here it is. And at a down-to-earth price too! Meet the CHALLENGER, another superb performing RC System with PRO LINE'S famous winning touch. No compromises here— just quality and reliability inside and out. Once you get your hands on this jewel, you'll never settle for less! Ask any pro. „ Complete 5 Channel System $ 3 7 9 . 9 5 GET ALL OF THE FACTS SEND FOR FREE PRO LINE DATAPAC TOD AY!

č/ecít cnt'ci

10632 North 21st Ave., Suite 10, Phoenix, Az. 85029 CITY/STATE/ZIP

This is why an alternative typical rib slope&thermal soaring sailplane is shown on the plans. These ribs, be­ cause they are solid, can be made from one thirty-second sheet balsa. Obvious­ ly, the weight o f the model will have The "H i-P erform ance Compact ” an effect on its speed and an effect on FEATURES its aerodynamics. A lot of ballast modi­ fied our model’s behavior, both by contour-sanded wing ribs SPECIFICATIONS wmg span 72 inches moving the CG forward, which is more machined balsa & plywood parts stabilizing, and by increasing the speed, plug-in wing panels & stabilizer^^^ÉB w e ig h t 24 o unces which may have helped to prevent an airflow problem. spruce spars So, build your model of the Speed all flying stabilizer Spitfire with whichever type of wing t * structure you desire, and if you have 8 hour building time flying troubles like I did, try turbulators. j M&S LIMITED it not at y o u ' d e a le r o rd e ' d irect This model is built using convention­ priCG $27.50 C a h t Wes add 55*5 ta» dealer inquires > bo»3974bL A Caht 90039 al techniques throughout, with only a few exceptions which w ill be covered indicated in the instructions is very all sheet balsa, Veco .19 R/C powered in detail. satisfying. trainer (honest), with rudder, elevator, The surface outlines are laminated. Finally, we built a servo! Only one is and throttle control. We note that the Because the outlines are ellipses or at needed in order to make final adjust­ transmitter is particularly handy when least smooth curves, lamination seemed ments on the transmitter for servo cen­ flying hand-launch type aircraft. With the right way to go. If balsa laminations tering and range of travel. The circuit its narrow width and the adjustable are to be used, they should be 1/32 by board for the sub-mini servo is awfully hand-strap on the back, it’s no problem 1/16 in size and enough laminations to small, and leads you to believe you’re to hold it in one hand while heaving an make the width shown on the plans. going to have a dandy time cramming airplane with the other. If model railroad basswood is used, the all the parts in place. Fortunately, the In summary, we would simply say wing laminations need only result in a integrated circuit makes up for a lot of that the Heath Company’s success in total width o f 1/16, and the tail lamina­ parts, and cuts the labor way down. electronic kit making can be accredited tions need only be two of the thinnest A total of 6 resistors, 6 capacitors, and to two outstanding facts: First, most available. Previous issues of Model Build­ two transistors, along with the I.C., all every red-blooded individual is a tink- er Magazine have defined the technique fit quite comfortably on the circuit erer who loves to take things apart and quite well. (July and December, 1972). board. find out how they work. In this case the The landing gear uses a torsion bar The first servo took about 3 hours tinkerer gets something that’s already suspension or shock absorbing system. to build, but each one that followed “ taken apart” and is shown how to put Bend the wire as shown after threading took less, with the last of four units it together . . . twice the satisfaction! it through a short length of 1/16 dia­ only taking about an hour and a half. The second fact is that when you put a meter aluminum tube. Poke the wire Each one ran perfectly, and it took only Heath kit together . . . it works! · back through the rear spar and cement minor centering to prepare each one of the tube to the front spar. This installa­ them for use. Peanut...... Continued from page 35 tion can flex until either the wheel or Since completion, the unit has been 15% chord point . . . that is, about half the leg strikes the wing lower surface tested in two ships. One was South­ an inch behind the leading edge at the without breaking any structure. western Sailplanes’ Baby Bowlus glider fuselage juncture. Lo and behold, it The tail surfaces can be left flat w ith­ (August, 1973 MB) and the other . . . worked! The model would have flown out adding balsa pieces to the stream­ a design o f this w riter’s which goes back better, perhaps, if it had notched spars lined section shown w ithout affecting a few years . . . “ The Square Hare,” an on the upper surface. the looks very much.

60 MODEL BUILDER SIG K O M AN ERÍ a f i n e THE AILERON TRAINER THAT DOESN'T LOOK LIKE A TRAINER Developed in an Actual Beginner’s Training Program

BUILDS K W IC K !

PRECISION CUT FOAM WING SLEEK BUBBLE CANOPY With Molded Framing JET STYLE MOLDED PLASTIC COWLING ENGINE SIZE: HANDY PRINTED FUSELAGE SIDES AND BOTTOM - .35 to .50 cu. in. Build Directly On the Wood. SHEET BALSA WING COVERING *2995 SHEET BALSA TAIL SURFACES PRE-BENT TORSION-BAR LANDING GEAR Designed by CLAUDE McCULLOUGH RUGGED 5/32" FORMED NOSE GEAR STEP-BY-STEP INSTRUCTIONS With Isometric Drawings The unique lines of the KOMANDER are a blend of prac­ WINGSPAN: 62” SIG QUALITY BALSA AND PLYWOOD tical construction features and an aerodynamic set-up especially selected to produce a model with a lot of built- LENGTH: 44” COMPLETE HARDWARE PACKAGE CONTAINS: in stability, yet retaining maneuvering and aerobatic cap­ WEIGHT: 5-1/2 LBS. Molded Nylon Control Hinges ability. Nylon Control Horns Nylon Nose Gear Bearing Nylon Nose Gear Steering Arm Construction is simple, strong and assembles quickly. A FOR 4 CHANNEL Tuf-Steel R/C Links removable fuselage top allows easy access to the fuel tank Aluminum Motor Mounts and battery storage area. R-C EQUIPMENT Nylon Screws for Bolt-On Wing Attachment si<; λ\λ\ίιιλιίίιι>ι\<; co., m: 401S.FRONT STREET MONTEZUMA, IOWA 50171

The propeller consists of two North the front view, goes on the other wing. Pacific plastic props notched half way When installing the fuselage upper Box 26263 through at the hub and epoxied to­ stringers, continue the top three clear 5V7-2Z7 Indianapolis, Ind. 46226 gether. The spinner is an old Kayson back to the aft end of the fuselage NL w l UO-page catalog FM-u only 504 ppd. plastic one, notched to fit over the four box. When dry, sand them to the proper NLWi MAPI an Series of scale 3-views for the solid modelers, scratch builders and plan bladed prop and epoxied in place after contour. Later, when installing the NO. O escriD t ion l/**8 i m the propeller hook has been installed. horizontal tail, they will have to be cut MAPIan-l Ryan FR-I Fireball S 1.00 $ .50 This means you will have to remove the free from the back o f the fuselage box MAPI an-2 Handley Page tie y fo rd - 1.00 MAP la n -3 Blackburn F irebrand V 1.00 .50 rubber from the propeller hook and to allow the insertion of the tail. MAPI an-L Navy/Wr ig h t NW-I 1.00 .50 wind it directly if you want to use an Other than the effect of the struc­ MAPI an-5 Vultee P-66 Vanguard 1.00 .50 Niwl Modernistic Plans Peanut Scale Seriest indoor winder. Usually, I prefer a wind­ ture on the surface contours of the air­ P -l F a ir c h iI d KR-21 13" span $ 1.00 P-2 Mr, M u llig a n DGA-6 1.00 ing loop bent in the shaft in front, but craft, the only intentional deviations P-3 hughes h-l racer 1.00 it would louse up the looks o f the from scale are the size o f the horizontal P-L Avia B-53L Fighter 1.00 P-5 Waco 220 Taperwing 1.00 model here too much. tail and the diameter of the propeller, P-6 Beech Bonanza V-Tail 1.00 P-7 Curtiss AE-3 Page racer 1.00 The upper wing fillets are made of both o f which have been enlarged. P-Q Gray Ghost (pusher) 1.00 The great god of the thermals, P-9 P-5 IB Mustang 1.00 bond paper. You will need to use the P -IO C h e s te r’ s Goon 1.00 “ Hung,” loves Peanuts. Let’s go feed P -lI P-5ID Mustang 1.00 cut-and-try method to get them to fit. P-12 S tin s o n R e lia n t SR-Q 1.00 Make sure they fit, and then cover them him. · P-13 Howard DGA-I5P 1.00 P -IL Vought OS2L/-3 K ’ fis h e r 1.00 with blue tissue before you cement P-15 Stearman P7-I7 Kaydet 1.00 them in place. Octagon...... Continued from page 79 P-16 Chester’s jeep 1.00 P-17 Cosmicwind L ittle Toni 1.00 Blue tissue was used on this model. added fore and aft and at the engine P-IB Corbin Super Ace 1.00 SPECIALt A ll 18 in special pi an/pack 13.95 It has one unfortunate characteristic mount. The nose and tail cones can NLWI Janick Peanut Scale Plans: not found in lighter colors. Whenever be made from 1/16 sheet or light balsa H-IOO Wittman Tailwind 13" span $ Η— IOI Piper Cub, dipped 12 3/L·· " there is a tissue lap joint, there is a blocks. The engine mount is 1/16 ply L-IOO Fairchild PT-19 13" " L -IO I jo d e l " O" 150 13" darker blue where there is more than with lightening holes, laminated with SPLCIALI A ll four plans for only $2.001 one layer of tissue. The best that can be 1/16 sheet. The base is three pieces of we carry cut-to-s ize dear plastic for Mat­ 1/16 sheet laminated with the grain tel vac-U-Forms, 20 sheets per package: done with tissue alone is to try to keep .005 Sl.OO/pkg. .010 Sl.25/pkg. these laps only over a structural mem­ crossed. Add a plywood firewall and Postagei add /O S 3rd Class, 25% 1st Class. ber. (This was not done very success­ balsa fairing blocks for braces all around. Plastic Scale kits: A irfix. Airframe, Frog, Fujimi, Hasegawa, Hawk, Heller, l & 5 Labs, fully on the model in the photos, I An .020 is the best power, but any­ MPC, Czech KZP, Monogram, M ch i mo, RARE- thing from an .010 to a sick .049, or planes, Lindberg, Pyro, Revel I, Tamiya....· fear). Perhaps a better way would be to Badger Air-Brushes, Imrey/Ris!ey and Polly use Fernando Ramos’ technique in even a Jetex, will work. The thrust line S p a in ts , many decal lin e s <£ accessories. Regular, free bulletins to steady customers. painting the model with Floquil model is straight ahead. The heavier engines Same-day shipment on all orders, via fast railroad paint in a nitrate dope base. may have to be moved back to get a flat and safe U.P.S. to L3 states, others go the quickest and best. Servicemen, try us - we Note that the oil cooler, as shown on enough glide. are experienced overseas packers,______.

DECEMBER 1973 61 could spell disaster. A 30 to 45 sec en­ gine run is normally sufficient. I haven’t figured out a dethermalizer yet, so put on your running shoes be­ fore the first flight. I can’t believe it flies . . . but it does. BILL OF MATERIALS: Makers 1 3/32 X 3 t f O O f in s 1 1/16 X 2 3 1/32 X 1 of 2 1/4 sq. 5 3/32 sq. plus misc. plywood wire and scrap blocks ·

R/C Champs . Continued from page 23 further through the pattern this time, while David Hardaker began to find his form with an improved score. Impressive the SANTA BARBARA ONE DESIGN were Pretner, again, whose rolling man­ euvers are really outstanding, and Matt, with Phil Soden deservedly close behind them. Round Two positions went like and SOLING-M r/c racing yachts. this: 1. Pretner 8135 2. Matt 7755 3. Soden 7725 210 EAST ORTEGA STREET 4. Yoshioka 7660 5. Kristensen 7520 6. Okumura 7400 SANTA BARBARA, CALIFORNIA 93101 7. Marlin 7380 8. Birch 7360 9. Pasqualini 7330 (805) 963-1636 10. Cappuyns 7325 11. Matt 7310 12. Takahashi 7275 13. Neckar 7245 14. Whitley 7225 15. Page 7140 Round Three which commenced late on Thursday after-noon benefited from virtually windless air conditions, which Soden and Takahashi o f Japan put to WALT MOONEY ALSO FEATURED good use with two truly brilliant perfor­ PRESENTS ARE CONSTRUCTION mances. In fact, the Japanese received A FOLIO OF WELL ARTICLES (2) AND A what amounted almost to a standing TESTED DESIGNS PAGE OF PHOTOS ovation when his model touched down smack in the middle of the center INCLUDING I3 SHOWING THE circle . . . the flying was that good! PEANUT SCALE ACTUAL MODELS Meanwhile the Americans, long-time PLANS, PLUS 2 SENO $5.00 (POSTPAID) dominators of the World Champs aero­ BONUS PLANS T0: WALT MOONEY batic event were faring less well than FOR OTHER 2912 CABRILLO MESA ever before, for although all were im­ SAN DIEGO, CALIFORNIA proving with each successive round, TYPES. I5 IN ALL 9 2 1 2 3 others were improving also. Big Jim Whitley for instance, very much the The thing should be test glided and Trimming is very easy, and the thing 'senior citizen’ of their team, flies very trimmed for a fairly flat glide by adjust­ will fly with the CG almost anywhere, well, but seemed to suffer the same ing the motor mount to change the CG. but observe the above precautions con­ problem we recall at Doylestown, posi­ If the motor ends up too far back, add cerning the transitions. For the first tioning maneuvers too high and too far some positive incidence to the front flight let the engine wind out . . . re­ out. Also, it appears the over-large man­ hoop and move the motor forward. It member I said that it cannot loop . . . euvers (and some o f Jim’s looping man­ will fly nose heavy but the transition believe me! The climb and glide are euvers were the largest we’ve seen) tend from power to glide can lake too long. assured, the only thing in question is the to lose reference, with resultant down­ And by too long I mean 300 feet or transition, but if it is gliding flat, that grading. Jim Martin is undoubtedly the more. It w ill begin to glide, given should be no problem either. showman of the U.S. team. His Banshee enough altitude, but the usual couple If you want some real fun, trim it mid-wing design, used by a number o f hundred feet in a climb is not enough. nose heavy and use a full tank o f fuel. other competitors, is very fast and will Directional control is rather strange . .. The thing will be a tiny speck in the sky knife edge from horizon to horizon — as when in a tight turn it begins to wobble when the power quits and then it will he forcibly demonstrated then will and drop too quick . . . turn the front dive straight down for several hundred knife edge through a 180 degree turn hoop only enough so you don’t have to feet before pulling out and gliding in, and knife edge all the way back! For chase it too far. but be careful, an early engine failure Jim though, Round Three was one of

62 MODEL BUILDER I'M CONTROLLED BY KRAFT’S NEW SPORT SERIES 2-3 CHANNEL RECEIVER-SERVO The receiver and 2 servos are integrated into a single case. A pigtail lead extends from the case and connects to a third servo. The third servo is actuated by a lever on the transmitter and can be used to actuate the throttle on simple aircraft, flaps or spoilers on gliders, and rudder or mixture control on boats.

KP-2-3B (system with dual stick transmitter) Third servo not included in price. $129.95 KP-2-3S (System with single stick transmitter) Third servo not included in price. $139.95 KPT-2-3B (Dual stick transmitter only) . . . . $ 49.95 KPT-2-3S (Single stick transmitter only) . .$ 59.95 KPR-2-3 (Receiver-Servo o n ly )...... $ 84.95 WRITE FOR FREE CATALOG ------450 W. CALIFORNIA AVENUE RAFT VISTA- CALIFORNIA 92083 _ SYSTEMS INC K WORLD’S LARGEST MANUFACTURER OF PROPORTIONAL R/C EQUIPMENT real frustration. After what may have 10. Pasqualini 11,040 many, Yoshioka of Japan, Wolfgang been his best flight o f four, he landed 11. Yoshioka 10,995 Matt and Norman Page doing the biggest and then went searching in the grass 12. Weixelbaumer 10,960 leapfrog in score among the five to for the spinner cap which had fallen 13. Bertolani 10,920 give U.S.A. a chance at the 'King Bau- o ff in flight, giving himself away in the 14. Birch 10,825 dion of the Belgians’ individual winner process. Until then, no one had noticed 15. Werion 10,650 trophy. (Such royal patronage seems . . . in F.A.I. competition, bits are not All three of the British team found rarely remembered in the heat o f com­ supposed to fall o ff models during their best form in Round Four, Birch petition.) flight . . . and Jim took a big fat zero. again the best, almost topping the 4,000 When these five assembled for the Jim Whitley too was less than happy, point mark. This last round saw many crucial two rounds early Sunday morn­ having missed his spin. determined do-or-die efforts with re­ ing, they were watched by the largest Things didn’t click right for Mike sultant noticeable all-round improve­ and most critical audience o f the whole Birch either, resulting in a fairly untidy ment in flying standard, as those with competition. string o f maneuvers which produced his the most remote of chances piled on the The pressure was on, and first on the lowest score of the competition. But for pressure in a last-minute bid for a score firing line was 21-year-old Harald Neck­ Dennis Hammant, bingo, a whole engine which would spring them into the top ar, whose sleek slim fuselage model run and a score which would help the five for the Sunday morning fly-off. with all-flying tail broke ground and British team standing. Harald Neckar, Among these was Voshioka whose immediately sucked up the wheels. The whose practice performance had im­ flight, which we unfortunately missed, pressure showed too because although pressed, now began to show his worth must have been tremendous it was the flight was a real pleasure to watch, with a score well over the 4,000 mark, certainly the high pointer o f the entire there were imperfections in the Double unlike Voshioka who produced his Championship. Norman Page o f U.S.A. Immelmann and the rolling maneuvers. worst performance of the contest during consolidated his position with another The tenseness o f the situation also this round, dropping him well below his 4,000 plus score after his Round Three affected Hanno Pretner and his mechan­ two fellow team members Takahashi sparkler while both Matt and Neckar ic father too. The flight by no means re­ and Okamura in a scoring line-up that scored high. flected the outstanding form o f earlier looked like this: The result was a considerable switch­ rounds, drifting towards the judges in 1. Pretner 12,280 ing o f positions, and while Hanno Pret- the outside loops, non-vertical entry to 2. Soden 11,740 ner remained at the top of the pile, the Top Hat and finally resulting in dis­ 3. Matt 11,620 never having dropped below 4,000 aster when Pretner Senior, nominated 4. Takahashi 11,515 points during the entire four rounds, the start of the Landing Pattern as the 5. Neckar 11,375 Phil Soden had a disappointing flight Super Sicrolly was running downwind. 6. Okumura 11,370 which cost him a fly-off place. The subsequent 180 degree turn into 7. Cappuyns 11,350 From this last round effort emerged wind resulted in a zero score for the 8. Kristensen 1 1,325 Hanno Pretner, who led for four whole maneuver. It was a mistake which cost 9. Page 11,260 rounds, Harald Neckar of West Ger­ Hanno the Championship and Hans

DECEMBER 1973 63 PEANUT SCALE! quietcleaneconomical PLANS- ■ ■■■ 's^»(SrTHINGS J PIETENPOL "AIR CAMPER" PITTS SPECIAL OUR LATEST PEANUT ! FOKKER DVI WINNER OF THE 1973 WATERMAN RACER FOKKER F II FLIGHTMASTER RUBBER DRUINE “ TURBULENT" POWER SPEED MEET, BD-4 THIS UNIQUE FRENCH WHITMAN'S "BONZO" DEMOISELLE MONOWHEEL RACER. PILATUS TURBO-PORTER SPAN 13” . PLANS: $1.00 GENERAL ARISTOCRAT *N0 many more! FARMAN\FARMAN FIRST CLASS P0it09* odd 25c CoMo»nio (mtomfu odd 5® W. C. HANNAN, GRAPHICS · BOX A OUR LATEST CATALOGUE 2 5 < t ? I ESCONDIDO · CALIFORNIA · 92025

Pretner was visibly upset. burning 45 per cent nitro. The score, Next came Wolfgang Matt, whose within 20 points of Pretner’s second, flight, although without serious errors was deserved and with it Tsugutaka did not click his Cuban Eight was a Yoshioka gave Japan the entire cham­ long way out - and scored accordingly. pionship, the Japanese team, all three If these three were nervous, then within the top ten having already Norman Page’s nerves must have been secured top team position. We find it on the ragged edge when his Mach I highly appropriate that the last single finally look off — even with an electric flight of the entire championship was ORBITEER 1/2A-A Price-S7.50 starter, the engine had been reluctant the one that secured the individual CONTEST OR SPORT FREE FLIGHT to fire up and he zipped through the trophy! FOR CAT. I orCAT II. WEIGHT 7 OZ. pattern to make up time, lost points for Hannan...... Continued from page 34 ORBITEER CONTEST WINS IN 1973: climbing away across the Top Hat and A beautiful clear, calm, Saturday . . . 2nd, 1/2A, Southwest Reg., Phoenix, Ariz. set the seal with a less than perfect spin. great for a ride and a picnic. He heads 1st, A, San Valeers Winternats, Taft, Calif. Last in the round was Voshioka who 1st, A, SHOC Annual, Taft, Calif. for the flying field. 2nd, A, U.S.F.F. Champs, Taft, Calif. immediately almost blew the Figure He suggests a movie. Great, I say. 1st, 1/2A, Max-Men Annual, Taft, Calif. M. His rolling maneuvers were rather It’s ” The Battle of Britain,” or "Tora, 2nd, 1/2A, Max-Men Annual, Taft, Calif. undulating and the depth o f field in Tora, Tora!” ■ II ■ positioning rather inconsistent. His score His idea o f excitement is going to a was therefore something o f a surprise Fly-in. Mine is banning home-built air­ for some in a line-up that looked like planes. A garage a hangar does not make. this: I want him to go to the store. He 1. Neckar 14,235 can’t, he’s just too tired. But just let 2. Yoshioka 13,920 him run out o f dope or glue, and it is 3. Page 13,880 Mr. Energy! 4. Matt 13,640 You’re at the flying site, and its past 5. Pretner 13,395 time to leave. He says: “ just one last So now it all hung on one more flig h t" . . . again. round in which Harald Neckar, first o ff My friend says, "What a cute air­ again, lost heading in his slow roll. His RUMPLER TAUBE Price-S8.50 plane. Is it your little boy’s?” I change four-pointer came out poor too. Pret­ 40" WINGSPAN the subject. ner, next up, made no such mistakes FOR .020 TO .049 ENGINES My husband asks me to lime his FLY R/C PULSE OR MULTI-CHANNEL and, showing that a setback would not next flight. He gets mad when I tell STAND-OFF SCALE . . FREE FLIGHT get him down, produced a superb per­ him 2 seconds. WEIGHS 14 OZ. WITH PULSE . . OR formance from beginning to end the Someone left water in the bathtub, 18 - 20 OZ. WITH MINI-MULTI . . . high pointer of the fly-off. and I pull the plug. He wants to know Wolfgang M att’s flight was also ex­ where his microfilm went. NEW PRICES EFFECTIVE OCT. 1, 1973: cellent throughout, little short of Pret­ "Remember all those old model mag­ 1/2A Starduster S5.95 ner on points. Norman Page’s flight was azines you had out in the garage? Well, Starduster - X S6.50 Starduster 350 S6.95 one he’ll certainly never forget. What the Goodwill truck came by and . . . Starduster 600 S11.95 looked like a truly perfect entry into where are you going, dear?” Starduster 900 S 15.95 the first stall turn of the Figure M TIRING IDEA B-70 S5.95 (the model really was stalled) suddenly H ydrostar S6.50 Scale model builder Howard Ferry, Eindecker S6.50 turned into a disaster, the flight finally of the Bronx, New York, points out that S. S. T. S9.95 capped with a spiral instead o f a spin at rubber "O ” rings made fine tires for Eaglet S5.95 flight’s end, ruining his chances. small aircraft. Plumbing supply shops Paper Tiger S24.95 Tank M o u n t $2.75 So finally, and appropriately to the generally stock these items in 1/2 and WW 1 Decal S0.50 flight that settled it all. If one were 3/4 inch diameters. The actual wheel tempted to query his first score total, can be made from balsa or hardwood, California residents add 5% Tax. there could be no questioning the lathe style, with the aid o f a motor tool. COMPETITION MODELS INC. second — the swept wing model came FROM A READER P.O. Box 8012 through like an express train on each “ May I tell you how much I enjoyed LONG BEACH, CALIFORNIA 90808 low scintillating pass, the Enya 60III your article ‘Pilots Man Your Planes’

64 MODEL BUILDER STILL THE BEST THERMAL TRAINER ! M o n terey

$ 3 4 9 5

NEW REVISED KIT, with; See your hobby aealer New Spruce Spar or you may order direct. New Hardware Package California residents add New Ply Fuselage Doubler 5% sales tax. Same Hands-Off Stability Same Easy Construction Same Winning Performance

Wing a re a ...... 625 square inches W ing s p a n ...... 100 inches Flying weight...... 3 0 ounces

ASTRO FLIGHT, INC., 13377 Beach Ave., Venice, California 90291 (213) 821-6242 in the Hannan’s Hangar column of the carry it. This will eliminate the pain of explanatory from the plans, but let me July issue. The absence o f pilots in cutting out the size you need from a emphasize the necessity to keep the con­ model planes, or worse yet, the pre­ large sheet. trol movement slop free. It should be sence of dolls, Snoopys, etc., in an The hinge for the spoiler is merely a your prime objective not to acquire any otherwise authentic looking aircraft has thin strip of Monokote trim sheet which slop at all. It will really show up when always been a source of annoyance to spans the length of the brass spoiler and you start flying. me. airbrake. This works very well, since it The movement for the “ V ” tail is “ In reference to this, I thought you seals the hinge line while it hinges. illustrated on the plans as a series of might enjoy seeing a photograph of the The wing tip is made of balsa and is positions which applies to the rudder- Antic I recently completed, and the not too hard to shape. The curl up con­ vator that they are shown on. Start with touch of reality I feel my pilot gives it. figuration was just to give the model a a small amount o f elevator control and After over a year o f work on the plane, full scale appearance . . . and besides, it work to what is shown on the plans. I really feel it was worth the extra week looks neat. The construction for the butterfly to make the pilot and really finish the After the wing is completed, take a tail is very simple and should not present job. The cap is made from material minute or fifteen to lay a strip of fiber­ any problems at all. taken from a real cap and is even fully glass tape on the center joint, top and FLYING lined (that’s where a wife comes in bottom. Now you're ready to install the First o f all, make sure you do not handy). The jacket is real leather and is wing mounting hardware. First o f all, have any slop in your control linkage made from an old pair of gloves. His construction alignment should be done and make super sure that your surfaces mustache and sideburns are real hair, with the wing positioned on the fuse­ return to center every time. and his goggles are made from leather lage. This way you get a good fit-up o f Balancing the Quasoar with lead shot using Tatone 5/16 inch instrument components. When you get the front as shown on the plans worked out very Bezels for the lenses. turtle deck bulkhead secured, bolt the well. The sequence used on the proto­ Sincerely, David Paine” front fuselage bulkhead to it and use type, I believe, will be very helpful to Quasoar...... Continued from page 11 this system to locate the fuselage bulk­ you on this bird, as well as on future en­ the lip panel washout w ill hold it’s head. The trailing edge cleat is a must counters. Install all the radio gear and shape and will not distort or flatten out. before you proceed to cover everything complete everything with the exception Before the top sheeting is applied to with the fiberglass turtledeck. Custom o f the ballast. Suspend the fuselage at the wing, take a razor saw and part the fit the turtledeck and glue into position. the C.G. Now, stick a Dixie cup on the center section half from the lip panel by Now take the razor saw again and saw tip of the nose with masking tape. Start sawing the brass tube between the two the canopy portion o ff o f the center pouring the lead shot into the cup until plywood ribs. Now take the center sec­ wing assembly. Now you should have a the tail comes up and the fuselage is tion half and position the root end on completed center section and a canopy parallel to the ground line. Now pour the centerline of the opposite wing with no frame under it. the lead that you have in the Dixie cup half plan. Block the completed panel Build a frame for the canopy. As you into the nose of the Quasoar. Mix up 12 degrees and proceed to build the can see from the plans, the wing bolt some Hobby Poxy Formula II and pour left panel onto the completed panel. serves two purposes; one to hold the it in the nose and let it soak through Now follow the same sequence that you wing on and two, to act as an aft hatch the lead shot. Lay a piece o f glass cloth used on the first half. You should find hold down. Clever, huh? You can in­ over the works and let dry. You may that this system will be a fast and more stall the rear fuselage bulkhead now. want to balance your ship just a little bit important, an accurate method o f build­ Mix up some Epoxolite (Sig) and tail heavy and bring it to the C.G. with ing a long, thin, 3-piece wing. contour a smooth fillet on the corner a few loose pieces o f lead. This way you As shown on the plans, the spoilers created by the turtledeck and the wing. are free to move the C.G. around a are made o f .030 brass sheet. The brass This fills in any voids that may have little. is K&S, and comes in a variety o f sizes, developed during construction. Ok, you have it all balanced out. including the size used for the spoilers TAIL Now charge up the “ Raydoe” and head and air brakes. Most good hobby shops The butterfly tail is pretty much self for the field. Make sure that left is left

DECEMBER 1973 65 FOR SERIOUS 1/2A FLYERS ONLY Here are two items designed to keep your Cox Tee Dee .049 (or .051) in top running condition. Both have been throughly field tested and used by modelers to set several National AMA Records. FRONT NEEDLE VALVE ASSEMBLY Λ Λ PISTON/ROD REST TOOL

$2.50 F EATURES: $2.95 BENEFITS:

1. 128 threads per inch for finer 1. Assures peak engine perform­ adjustments. ance. 2 Nylon seal over threads and 2. Extends engine life. needle valve body which keeps 3. Eliminates the possibility of Ik air from sucking down the breaking crankshaft when en­ thread area. Prevents "false" gine is run at high RPM. needle settings. Tool made from hardened steel. This custom needle valve assembly w ill help you get more consistant engine runs . . . flight after flight. SEND 10 CENTS FOR LIST DEALER INQUIRIES INVITED OF OTHER 1/2A ITEMS. KIRIU-KRAFT • P.O. BOX 224 < ANAHEIM, CALIFORNIA 92805 and right is right. With a butterfly tail extends to the keel in the body, and and turbulent air, and the flexing-wing the movement is just opposite of what it wood screws that secure the towhook construction makes it pretty much goof- would be if you pictured the rudder- penetrate the pylon. This directs tow­ proof in windy weather. We hope you’ll vators as ailerons. (If you're still not ing loads to the pylon, rather than the enjoy the success the machine is capable sure, double check Le Gray’s article in fuselage, and allows a lighter body with­ of achieving. the June 1972 issue o f MODEL BU ILD ­ out sacrificing strength at this point Intercepter. . Continued from page 47 ER. wen) Give the Quasoar II a few The original model was covered with good hard hand launches. Don’t be light-weight Japanese tissue. We used Historically, Goldberg first played afraid to really throw it. After you’ve an old trick with which may bear re­ around with this design in 1940 follow­ gone through the initial testing, hook it pealing here; use nitrate-based dope to ing on the heels o f his outstanding to the towline, because you’re going to prepare the frame work for covering success with the Zipper. The original need some altitude to find out any­ with a minimum two coats on the development featured a much higher thing else. underside o f the wing ribs, and for pylon that was finally settled upon in After the towline has dropped away, applying the tissue. After careful water- in the production version. The design start to get the feel o f it. Let it go shrinking, use butyrate dope for the did undergo some changes in the post­ hands off, see what it ’s doing, and finish coats, and the covering w ill not war series, as Goldberg tried cutting the correct accordingly. You’ll find that the pull away from the underside of the rudder away to the point where the butterfly tail gives you a very positive wing ribs. model would do a half loop with a roll/ out on the top; in short, a series o f turn. Also, don’t let the speed get too FLYING immelmans! slow, get the hang of flying a little faster Contest-tuning any towline glider is The same modification was made to than usual. a long involved process, so stay with his large size Sailplane, but in the long The spoilers/air brakes I am sure the machine and be certain that it is run, it was found the original rudder you'll find very valuable, and with some performing as well as possible. practice, you’ll have the landings down gave more reliability. The original Pull-Q is set up for The kit was produced after it made to a science. Use the spoilers as you “ Solo” flying. The hook is located would throttle on a power plane. Don’t a sensational debut at the Mississippi farther back than would be required for jerk them all the way out and then re­ Valley Annual. Because of its size and normal two-man flight, so the model tract them. Instead, gradually extend ease of construction, Interceptors quick­ will ‘kite’ up on a one-man launch them as you need them and co-ordinate ly dominated the Class A and Class B from the reel. As a result, the model the use of elevator right along with the events. When Ray Arden came out with will tow docilely until all line is out. his famous Arden .19 after WW II, this, spoilers. Thermal-searching with all line out is Well, there you have it. I hope I have combined with an Interceptor, was un­ difficult because the ship tends to re­ made the construction clear to you. If beatable! Today, using Cox .049 en­ lease too soon, so we hold back about not, contact me through MODEL gines, the boys can take this design twenty feet of towline. When the BUILDER. using a glow engine with the short glider which normally stays at about So, in the interest o f soaring, I wish motor run handicap and still win handi­ eighty degrees in dead air, gets into lift to leave you with the immortal words ly. You should try one yourself! and comes up directly overhead we let of Jonathon Livingston Seagull, who, out the last o f the towline before re­ Choppers .. . .Continued from page 15 after completing 287 consecutive loops, leasing it. This way, small ‘bumps’ thus breaking his old record o f 285, easy, just like on the ground, and even won’t disconnect it. turned to his good friend Maynard Gull rolling lift-offs created no “ suction and said, “ Squawk!” . . . because every­ Make up a separate towline for your effect” as I had anticipated (from fly­ body knows seagulls can’t talk. A/1 's. The extra five or so feet allowed, ing full size seaplanes). And the landings (A /l towlines are measured without . . . wow! I never dreamed they could Pull-Q...... Continued from page 43 tension applied), w ill many times spell be so velvet-smooth, with the pontoons this method, only a minimal amount of the difference between a max and a gently settling into the water! ballast w ill be necessary to trim the short flight in marginal conditions. Flight characteristics seemed to be completed ship. Note that the pylon The model is stable in both dead about the same except that control

66 MODEL BUILDER WINDSPIEL/SOARCRAFT kestrel 19 HIGHEST PERFORMANCE MODEL SAILPLANE

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response was slowed down slightly . . . any other heli-meet I ’ve attended! And and this might be favorable to the be­ that doesn’t count the eight or nine ginning pilot. When I received the floats, other ‘copters left hanging in our work­ it was suggested they might make ex­ shops because of transportation diffi­ cellent “ training-gear.” I agree . . . they culties. might, however, I feel there is too All the birds flew well in spite of a much “ bounce and spring” to those couple of near misses with the only tall air-filled pontoons when touching down street lamp on the entire block . . . on dry land, which could cause more Tino’s new Jet Ranger just wouldn’t problems than a conventional training do anything but “home-in” on that gear. At this time of writing, I under­ pole! As usual, Nate put in some beauti­ stand Kavan has a set of floats made ful “ body english” as he polished up on especially for the )et Ranger Helicopter, his landing techniques while engaging in and it’s possible they are also suitable an informal contest with John Mina- for use as training gear, so you might be sion's one-handed, mid-air catch and re- interested in checking this out with your lease-Ha! dealer for availability. Charlie Gilbert is a first class designer My last reaction to float-flying was a and machinist, and has just completed surprise . . . after having sloshed through- his latest helicopter with “ collective blade pitch changes were o f little help, the shoreline mud in my bare feet a few pitch” control. He is basically a single­ although we were able to make short times to retrieve and refuel the Kalt, stick pilot, but had to install a two-stick hops as long as the light breeze kept it suddenly struck me I was doing it unit after a radio failure, so is learning blowing. The following day however was all wrong! The main reason for a heli­ all over . . . A couple of the other two- considerably better . . . only because a copter is its utility and versatility . . . stick pilots flew his machine though, still hotter fuel was used, glow plugs so, why not fly it “off” the water and and report that it is amazingly respon­ changed and the cooler early morning "o nto ” the ground? ‘N uff said; the sive and very stable. Charlie is now air was dense enough to support the transition from water to land was the building a 4-blade 'copter with an eye weight. These were the first helicopter way to do it. And if you haven't done toward “ all-out” aerobatics, and know­ demos in Mexico and local interest ran it yet, you should get a pair of floats ing him, he will do it. More on this one at a very high level. Expect to hear a lot and get set for the best fun-flyin ses­ later. Our next step is to get organized more from these wonderful people sion you’ve ever had! and form a heli-club . . . we talked a bit South o f the Border as they branch out HELICOPTER FLY-IN on this and decided to take more posi­ into this phase of modeling. In mid-September, a group o f local tive action at some future date when FINAL APPROACH heli-pilots decided to hold an exclusive we could get together again. In closing for this month, let me “ fun fly ” in sunny Southern California. HELICOPTER DEMO IN GUADALA­ again invite your photos, hints, etc. and The chosen site was a cul-de-sac, closed- JARA, MEXICO especially your comments on this loop road, on the outskirts of Tustin, Another September activity was the column . . . every other magazine sez California. In attendance were: opportunity to take the Kavan Jet “its your column” and “we want to Tino Villanueva, Kavan-Jet Ranger Ranger and a Hegi-Cobra down to the publish what you want,” but this time, . .. Nate Rambo, Scratch B u ilt. . . John Aero Modelista Flying Club in Guadala­ I really mean it! Minasian, Hegi-Huey Cobra . . . Charlie jara, Mexico and demonstrate high alti­ Gilbert, Scratch built “ Collective” . . . tude capability (or lack o f it) during R/C Pylon . . . Continued from page 25 John Tucker, Kavan-Jet Ranger. . . Kim their annual Pattern contest. The first but not quite like the K&B. Jensen and Tucker, Kalt-Huey Cobra. day didn’t go too well because o f the Vartanian have the steadiest running en­ The last member of our clan, John afternoon heat and altitude . . . we were gines so far. Their engines are easy on Gorman, had a last minute com m itt­ plagued with sudden engine stoppages the needle and seem to get better air ment and couldn’t make it, however we just before lift-off, and simply a lack of •runs than Tussing’s or Prather's. Prather had more choppers in the air than at power output. Hotter fuel and rotor- seems to have the fastest set-up at the

DECEMBER 1973 67 Annual featured two days o f Old Timer flying. The big winners were Gene VINTAGE R-C FLANS Wallock, and Larry Boyer o f San Diego. Between the two, the majority of first V V place trophies were taken by them, and Wallock also wound up with the Sweep- I stakes merchandise award. That makes 1 two in a row for Gene! J The oldest established Old Timer NOORDUYN MK.‘4 NORSEMAN λ PIPER J-3 CUB FAMOUS CANADIAN AIRCRAFT ? contest was again continued this year V FT W in g Span — d is ig n io ·» . i .c.s w o i h i with the 13th Annual Stockton meet V ( id e a l for ROSS "tw in To r "f o u r " ) 84 WING SPAN -M U L T I V being held at the Fresno Gas Model w h e e l s - f l o a t s On p l a n s 2 Plans: $ 10.95 Association's new field. Big winner was P LA N S $ 1 2 .5 0 Y X 3SH,I,S >*'«R .' α ^ α α *α α * ^ .* μ *α α *α α *α α *α .* α α *α Λ α*μ %H*H»*% * ♦ · ♦ * ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ * ♦ ♦ ♦ * Λ · * * Larry Boyer, taking all three first places entered. How about that?? Three outta SENO 2 5 (t FOR 77>' CATALOG TO D A Y / / WORLD WIDE DEALERS 4 DISTRIBUTORS INQUIRIES INVITED t l three ain’t bad. SID MORGAN By now, you are probably tired of 13157 ORMOND, BELLE V IL L E ,MICH.48IIIU.S.A. reading about the doings of California Old Timer flyers, but the writer didn't EASY - FAST PRECISION PARTS receive very much copy this time. The CONSTRUCTION COMPLETE HARDWARE "HANDS OFF- lone exception is Pete Sotich, who re­ STABILITY gularly reports the Old Timer Events KIT INCLUDES: from the Chicago area. This column has Precision cut wing no intention o f competing with the ribs, ply dihedral joiners, tips, fuselage Span 76 in. official S.A.M. publication, “ SAM sides, formers, ply Flying Wt. 24 oz. Speaks," as the results of the meets are hatch, ply bottom, Area 500 sq. in. nose block, fin and generally carried therein. However, the rudder. writer is interested in hearing about the Rolled plans. various meets with the idea to help same and promote next year’s shindig. Even­ * 2 9 ” tually, we may be able to work up a contest calendar. Then too, good photos (notice I said good photos) are always PIERCE ARROW welcome contributions. Let’s hear from 2 METER CLASS R/C GLIDER you characters! PIERCE AERO COMPANY M AIL BAG 9626 Jellico Ave. Northridge, Ca 91324 Dealer inquiries invited Got a long letter from Bruce Chand­ moment. When he gets his to run as modified, o f course). ler, representing the SCIF club, taking steady as Jensen’s, LOOK OUT!! These A new rumor has it that O.S. Max the writer to task for too much emphasis fellows run with almost any engine they w ill produce a racing 40 called the SR on R/C old timer free flight reporting. Honest injun, we didn’t intend for two get their hands on. Only a few races ago, series. Should be available on or around consecutive articles on R/C O.T. F/F to Jensen had an OPS screaming in a Pitts January 1, 1974. A first run o f 100 or come out, but it just happened to Pellet until the lower end let go! It will 200 pieces is planned. Maybe by then occur that way. However, if SAM is to be interesting to see what these fellows we will have an organization that will grow (and we are, with new members do by the Tournament of Champions! require the 1000 that we all voted on! every day), then we must recognize Remember a few issues ago, when we I seriously doubt it! (Wrong! We will! what is extremely popular on the East told you to watch the ‘‘El Bandido.” wen) What happens to the fellas who Coast. This writer has no intention of This aircraft has really come on strong buy the first one or two hundred and abandoning the classic free flight models at the last few races. If you want to see the next year the manufacturer decides but does regard the radio control section some most beautiful work on a model not to make the mandatory 1000. Oh as fun too! airplane, you should see the sensational well, they w ill make good paperweights! work of Harley Condra and his Ban- Didn’t hear too much in the letter dido’s. Harley is a very articulate builder Plug Sparks . .Continued from page 47 writing end of things regarding the pro­ but has problems taking his racer home Naturally, the meet suffered from posal advanced by the author to help in one piece. He has had bad luck in the lack of Southern participation and the alleviate the power scramble resulting last couple of races coming o ff No. 3 Northern boys won in a walk. This trans­ from the present R/C O.T. F/F rules. pylon, which is giving him a lot of prac­ planted Northerner had planned on at­ Did receive some commentary from tice in building. This airplane, the El tending but when old hot shot Wallock Jimmy Dean, Editor o f the SCAMP Bandido, has really given Condra a lift. threw his back (fell o ff a bar stool, I newsletter, “ Hot Leads,” wherein he In his first race as an expert, he turned a think) out of whack, that did it for advances the idea of not using radio at fantastic 1:25 to amaze everyone! Ed transportation! Matter of fact, the all, except to retrieve the model. Sever­ Hotteiing switched to the El Bandido whole Southern effort collapsed follow ­ al other modelers have expressed the and won his first overall event at the ing this cancellation. See whatcha did, same opinion, that when the transmitter Western Formula I Championships at Gene! is used, the flight time stops. However Tracy, California. We cannot say enough Next year, the onus of responsibility this does not solve the power race about this Ed Foster design, which is will be on the Southern boys. The problem. really coming on! writer is hopeful of a real good turnout Dee B. Mathews of Greensburg, Rev-Up props are being used quite with a resulting high rivalry. This Kansas, takes a completely opposite extensively now in pylon racing. At Yankee-Rebel idea is great. Just needs a view with radio control the whole way, the last event we happen to see Don good push! Call on this mag if you but with certain power restrictions. His Powell, Ed Hotteiing, Bob Smith, Ron need publicity . . . you’ll get it! (Right! idea would be take the original air­ Schorr, Jay Replogle, Jim Rogers, plus wen) plane’s specified power, say like a .60, many others using the Rev-Ups (much The highly publicized San Valeer and reduce this to a .29 glow engine.

68 MODEL BUILDER S u-Pr-RO t h e AU WEATHER p u s h r o d BEATS THE OTHERS HOT OR COLD COMPLETE WITH ALL HARDWARE 44" LONG AND FLEXIBLE PLAINFIELD. ILLINOIS 60544 MAKERS OF ADVANCED PUSH RODS SYSTEMS: PROROD-NYROD-MASTEROD & MASTEROD-XF Similar scaling could be done with an "IT'S GOOD ENOUGH FOR THE VERY BEST!" $139.00 original .29 power, limiting this to .09 PRICE INCLUDES: (Less Battery) or .15. He quotes his own experience 90-Day Material and Workmanship with an OS Max 30 powered Buzzard Guarantee. Bombshell, where the model still has Complete Operating Instructions. enough zip to fly upwind. He feels we Single Unit Construction. should gel with the rules in a hurry, as 6 or 12-Volt Operation. Tow Rings and Flags. this could be the hottest thing to hit Foot Switch. STANDARD free flight. Line Retrieval Switch. AMERICAN High-Speed Motor. Fred Collins also disagrees with the SOARING author's proposal. He reflects the same 2300 feet of 125 lb. Line Line Guide. WINCH opinion as others, that the model w ith­ Aluminum Reel. out power control cannot get upwind a Reel Brake. sufficient distance to register a good Turnaround Pulley. flight and at the same time hit the spot THE MODEL GLIDER WINCH THAT LAUNCHED landing circle. To get back to the use o f THE 1973 LEAGUE OF SILENT FLIGHT CONTEST. original ignition power, he suggests a BUCK'S SOARING SUPPLIES 1303 Rainbow Ridge Encinitas, Ca 92024 50% added motor run (30 seconds com­ pared to present standard 20 sec.). He ber o f the Model Engine Collectors feels the aim o f flying Old Timers should Association (MECA), and is an active *£NJ0YMFNT / i > ( be to get as close as possible to the old SAM member. Drop a line to this mag days. AMEN! expressing your willingness to go along R/C SAILING Actually, the proposal advanced by this writer resulted from discussions with this proposal. If we get enough re­ with Art Schroeder, with the idea devel­ sponse, we’ll launch the program. (Add- oping to get the flyer to use the trans­ dress yo ur letters to "Plug Sparks" c/o MODEL BUILDER, wen) mitter only for the glide portion of the flight. Since then, darn little has been THISSA AN D TH ATTA heard from the eastern boys. If you Despite rumors to the contrary, the like the way the rules are now, lets author was not held prisoner at Shakey's hear from you. Otherwise, the author Pizza Parlor every night at the Oshkosh will initiate some action for a SAM rule Nationals. Such defamation! change. If some of the modelers think S.A.M. MOTORS has a set o f complicated classifications, Bob Von Koňsky, of San Jose, writes the writer sez count your blessings after seeing what the Australians have adopt­ to propose a pool be set up to purchase ed in their official rule book. Get a "runner” type ignition engines. With load of the following schedule for their many engine collections being bought old timer contests: p ..t and sold, a considerable amount of garden variety type engines are becom­ Wingspan Points Pre 1943 1942 ing increasingly available. Bob proposes (inches) for size motors motors that interested SAM members (or other Up to 4 1 0 .19 .06 interested O.T. fans, for that matter) 42 up to 54 0 .29 .09 KITS FEATURE: would contribute an initial ten dollars 54 up to 66 0 .49 .15 • Preformed plastic hull, deck and components in the pot to give the pool some buying 66 up to 78 0 .60 .19 for simple 2 evening assembly power. This would make engines avail­ 78 up to 90 5 1.00 .29 • Sails fabricated from Nylon Spinnaker Sailcloth able to the average modeler who doesn’t 90 up to 102 10 1.00 .35 • Complete hardv/are package care if a fin is chipped or not, so long as 102 up to 114 15 1.00 .45 • Step by step instruction· include R/C details. it runs. This should get around paying 114 up to 126 20 1.00 .49 TAHOE 6 0 0 BALLAST PKG AVAILABLE $3 50ppd some o f those extravagant asking prices Over 126 25 1.00 .60 SAIL CONTROL UNIT (up to 36 in models) $ 2 2 .9 5 Complete SAIL CONÍROL CONVERSION KIT USING YOUR for old engines. One might wonder where to get ROTARY OUTPUT SERVO MECMANlCS $ 1 0 9*>ppd Perhaps we can prevail on Bob Von those large size models, but the answer VICTOR MODEL PRODUCTS Koňsky to head this thing up. His repu­ is simple when you realize scaling up or Box 2168 Dept. A, Downey. Calif. 90242 tation is beyond reproach, he’s a mem­ down is allowed in exact ratios o f 1/2, * Call! Rev Add 5% Tax Dealer Inquiries Itwiled

DECEMBER 1973 69 t Workbench . . Continued from page 4 w m d i e fl Schluter make a 5 second flight in 40' ol Harsewinkel, Germany, 1968, and has M«n,\phr«i(.*l 5 or 6 "choppers” ready lo go at any FEMALE ROD END ...... MALE ROD END CANQPIE? ROD ENDS IN MINIATURE -SAME AS FULL SCALE IN 15 DIFFERENT TYPES moment. His son Kim, is also an R/C Rod End Dim, Dim. Body Ball Weigh! •DETAILED S lin d u d $ .85 lo S I 60 Type Thread Price chopper pilot, and between the two No. A B material material gram» 5 DIFFERENT sizes Special ...... $ 85 to $1.60 ?HEF -Λβ It8 3/8 umu· tl«H 1 untienrcl »te*· 7 56 I 60 Sf%75 (including P510) Detailed S 85 to Si 60 of them, they have built and flown just 7 REF-348 7/8 3/8 lemali· »Irri funder»«! UeH 348 1.56 SI.75 3 REF 440 m 3/8 tmvili· U*vl hnihnerl nee 4 40 1 53 $175 about every kit that has become avail­ 2 REM 256 1 0 3/8 mj*c lleH hank*.«·!! Her 256 168 SI 7S Seller an k t-F la p horn»—Elevator able. 7 HEM 348 1.0 3/8 mule »ted limtenert ucel 348 1.75 Si.25 horn»—Puthrodt Like we said, "Ask a silly ques­ ? REM-440 1 3/8 9/16 mil* tlnri luwrlened »Ivel 440 747 SI 76 EIC..-OVER 60 NEW ITEM S tion ...” SPEAKING OF STAFF . . . FREE # In addition to John “ Chopper Chat­

BIG 10 PAGE C ATALO G ter” Tucker, MB will have another new

SPRING STEEL- SPRING STEEL- I7 /1.S7 WRITE I S IdR II contributing editor starting with the ELEV HORN & NYLON TUBES- HARDWARE January issue. Bob Stalick, Albany, Hi JOHNSON MODEL PROD. INC.. 11051 18 Glenoaks Blvtl. Oregon, has joined us as moderator of the free flight department. Since Bob is about to retire as AMA District CUSTOM R/C XI Vice-President, and has resigned as Director-Al-Large of NFFS, we felt he INC. CAR PARTS needed something to lake up his spare time. HRE — 210 Bearing Blocks WHERE YOU GOIN’, NATS? HRE — 001 Chassis (CAM DOUBLE AS WING It seems that our confidence in T 6 080 Al. $8.95 TUBE MOUNTS) Ontario Speedway, California as a western (at last) Nats site, was a little HRE - 200 HRE - 019 premature. Further investigation only Power Adjustable Engine Mount USE ANY 1/4" DIA. a week later indicated that Speedway Rear End S16.95 (for Veco 19) AXLE, AND TAURUS, officials wanted $25,000 . . . just for starters . . . that is, plus all profits from INCLUDES: MACHINED BEARING S8.95 ASSOCIATED, OR MRP GEARS. admissions, food and souvenier sales, BLOCKS, (4) POWER ADJUSTMENT exhibits, etc. Aftei paying $15,000 for SPACERS, AND BALL BEARINGS. Oshkosh, only to find out that the EAA was still pulling the strings, has made HRE Inc., P.O. Box 4658, Irvine, California 92664 AMA a little gun-shy . . . to put it mildly, about taking on any cash re­ 3/4, 3/2, and 2/1. Also worth noting is FLASH! |usl received an announce­ sponsibility. Can’t say as we blame that 10 points are awarded for using pre- ment from Tim Banaszak, Secretary of ’em. 1943 motors, with an additional 10 the Society o f Antique Modelers Meanwhile, at the suggestion o f John points for employing spark ignition. Up (S.A.M.) The 1974 S.A.M. Champion­ Embry, President of the Lake Charles, to 20 points are awarded for finish and ships will be sponsored by the Old Time Louisiana LARKS (Lake Area Radio craftsmanship. These points are added Eagles of New Jersey. The contest will Kontrol Society), John Worth flew to to the flight times, which are limited be held on July 2, 3, and 4 at Lakehurst that city to take a look at former to three minutes maximum. Naval Air Station. Contest manager will Chennault Air Force Base. Embry and Something of interest for possible be Woody Woodman, 389 Floral Lane, the LARKS had put together quite an SAM rule modification is the Australian Saddle Brook, N.J. 07662. offer to AMA, and to back it up, our rule allowing a backup model to be Inasmuch as this is the first time the AMA Executive Director was met at entered if the original is lost or damaged. Old Timer Nationals w ill be held on the the plane by officials o f the Lake But, you start all over again. east coast, all traditional events will be Charles Chamber of Commerce, the LAST WORD carried with the possible exception of J.C.’s, and the Tourist Bureau. He also The writer has heard nothing from Unlimited Antique. There isn’t quite met with the Mayor of the city! Woody Bartelt or Tim Banaszak, SAM that much room! Chennault A ir Force Base, built for guiding lights, regarding the site for the Full credit should be given to the B-47’s, was taken over by the city some Old Timer Championships. According Old Time Eagles as they have been able 3 or 4 years ago, is closed, and is FREE! to correspondence received from Ed to secure use o f the N.A.S. at Lakehurst Most of the buildings are occupied by Franklin of the New Jersey Old Timer through Commanders Jack Bolten and city organizations, but three hangars are Eagles, it looks like Lakehurst will be John Kelly, both ardent modelers and available to AMA. next year’s flying site for the O.T. active SAM members. In addition to Now hear this . . . the main runway Nats. Ed further notes he has been having an adequate field for free flight, is 200 feet wide and 12,000 feet long! selected to run the free flight end of the blimp hangar will be available on (That’s over 2 miles!) This runway has things. How about some confirming July 4 for an indoor event. How about a parallel taxi strip. Near the hangars information men?? Quite a few west that?? are two 1,000 by 4,000 foot ramp areas! coast boys are going east if given e- Woody Woodman has assured S.A.M. One problem . . . if you’re on foot, nough time to plan for the vacation that all activities w ill be held in addition you may starve to death getting from schedules. (Understand it may be July to the regular contest; the Annual SAM one site to the next! Free flighters will 2, 3, 4. wen) meeting, MECA National Collectogether go APE if the Nats end up here. That’s it for this time. Next month, (that’s a great item!), and the Victory As has been pointed out before, the we’ll talk about the unique Texaco Banquet. Also, campers will be allowed. flying site is the most important, but Event being staged by the SCIF boys So, let’s not hear any excuses that not only factor in choosing a Nat’s loca­ at Taft. Imagine the R/C controlled motels are too expensive. The whole tion. However, as indicated by John jobbers versus the free flights. Sounds setup looks simply great, so make plans Worth's reception, the city o f Lake like more fun than a barrel of monkeys. now lo attend. · Charles is prepared to greet the 1974

70 MODEL BUILDER ASTEROID CLASSIFIED ADS 48 in. SPAN A1 GLIDER Non-commercial: Rate is 25 cents per word with a minimum of $3.00 worth. Commercial: Rate is 40 cents per word with a minimum of $5.00 worth. No mail-order discount house ads knowingly accepted. All ads are payable in advance and may be for any consecutive insertion period specified. Name and address free. Send ad and payment to; The MODEL BUILDER, Classified Ads, 1900 E. Edinger Ave., Santa Ana, California 92705

SCALE PLANS. Big 30 x 42 Bluelines. All DIRECTLY FROM ENGLAND! 1" = 1 foot. 3-Sheet sets: Douglas 0-25C, Model airplane plans. Peanut, rubber, CO 2 . YO-31A/O-31 B, YO-31C/Y10-43, 0-43A, gas. Free list. Send self addressed, stamped Jim Baguley's A/1 "Asteroid" 0-46A, Fokker D-17; $4.50 each. 2-Sheet envelope to: Modernistic Models, Box 6932 Featured in Aeromodeller sets: Douglas 0-38, Davis D-1K; $3.00 each. Burbank. California 91510. $7.00 plus 50 cents postage General Western Meteor, 1 sheet; $1.50. Mailed folded and postpaid. PETER W. WESTBURG, 834 Seventh S t„ No. 6, "DO-IT-YOURSELF AERODESIGN" - Also . .. the A/1 "Satellite" Santa Monica, California 90403 Sailplanes, FF, HLG, R/C Sport, Charts, instructions - $4.95. Same price as above. Morton M5, excellent condition, complete. Eric Lister, 953 Klockner Rd., Trenton, For sale to highest bidder. Ralph Lauritsen, New Jersey 08619 320 South Story, Boone, Iowa 50036. 78" A/2 "Nova" $20.00 plus 75 cents postage Counter...... Continued from page 5 the gasoline and SAE 70 oil mixture. The company will also be importing After WW II, the family moved and the Czeck MVVS .15 engine in glow and the new basement was damp . . . no Czech MVVS engines, Russian and diesel, and circular-tow glider hooks are good for modelling at all. Then marriage Czech tow hooks . . Coming soon! on the way. Write for full particulars. and starting a family, and then building * * * a house. Wonderful house . . . we did a As you w ill note in their advertise­ fantastic job . . . only made one mistake New Power Timer by Ray Monks ments, two model manufacturers have . . . I forgot to work out something for $20.00 plus 50 cents postage moved to new quarters. Carl Goldberg a workshop and ended up in the car­ Models has relocated in Chicago. It’s port storage room sharing space with California residents add 5% tax to now at 4736 W. Chicago Ave., Chicago, the washer, dryer and furnace. There all items. Illinois 60651, where available floor was room for a workbench over the oil space has been more than doubled. tank for the furnace . . . just exactly COLONY ENTERPRISES Hi Johnson has also made a change, six feet long . . . three or maybe four at 2337 Ewing Street and is now located at 11051-18 Glen- the most feel deep, and a space to oaks Blvd., Pacoima, Calif. 91331, Los Angeles, California 90039 phone (213) 899-4312. Incidentally, Hi Index to Advertisers also points out that his molded canopies Astro Flight, Inc...... 65 have now been repriced . . . lower! All B uck's Soaring S u p p lie s ...... 69 Nationals with open arms. Camping, three styles now range in price from C le m c r a ft...... 67 dormitories, and all related facilities are 85 cents to $1.60, depending on size. C loudbuster V entu re ...... 58 available. Many fine motels and restaur­ Tinted ones arc coming! · Colony Enterprises ...... 71 ants are in the area, and the city is con­ Competition Models, Inc ...... 64 siderably closer to Southern California, R /C ...... Continued from page 17 C o v e rite ...... 56 being about I50 miles west of Oshkosh called the Flight Pacer. Very small in Dumas Products, Inc ...... 2nd Cover and almost directly east. size, it mounts on the top of your F ly lin e M odels ...... 55 F ranny's C h ro m e ...... 54 At this point in time, Lake Charles transmitter and beeps you at any pre-set F ranny's C hrom e (B ra n s o n ic )...... 58 looks like the place. By the way, the time . . . such as when you have a Carl Goldberg Models, Inc ...... 1 date will probably be early August. Any­ minute or two left on a pattern flight, W. C. Hannan ...... 64 time in July would be too close to the and so on. You can set the timing to Heath Com pany ...... 57 proposed World Champs in C/L and R/C beep you at about any chosen interval. H R E , In c ...... 70 Scale, scheduled for Lakehurst, N.J. in In addition, it w ill beep if your trans­ JASCO ...... 51 early July. mitter is accidentally left on. Cost is H i Johnson M odel P ro d ...... 70 OTHER THINGS TO DO only $7.98 and you can put it together K & B M fg ...... 52 The RAMS (Radio Aero Modelers from the complete instructions in just Kirn-Kraft ...... 66 of Seattle) will hold their 9th Annual about two hours. It takes power from K ra ft Systems ...... 63 Marlow Engineering ...... 58 R/C Model Show on February 9 and 10, the transmitter and the current drain is Miniature A ircraft ...... 61 1974, at the Sea-Tac Motor Inn, I8740 very small. A very handy item. It is Model Builder Products ...... 50 Pacific Highway South, Seattle, Wash­ only an inch wide, barely more than Model Rectifier Corp. M RCI. . 4th Cover ington 98I88. Additional information half an inch deep, about an inch and a W alt M ooney (P e a n u ts)...... 62 on the show can be obtained by con­ half long, and comes complete with the Sid Morgan (Vintage Plans)...... 68 tacting Show Chairman Robert R. liny case. Fully guaranteed. Contact; M & S L td ...... 60 Gruye, 4II8 32nd St., S.W., Seattle, Telecraft, Box 495, Kirkland, Wash. Orbit Electronics ...... 59 Wash. 98126, (206) 932-7583. 98033. Pierce Aero Company ...... 68 * * * Workshops are always a problem for Pro-Line Electronics, Inc ...... 60 REM CO M fg. C o...... 54 R/C’s mid-winter “ MECCA,” the the modeller. Over the years I have had Royal Products Corp ...... 3rd Cover Toledo Symposium, is scheduled for all sorts o f them. My workshop when I Sig M fg . C o ...... 61 February 23 and 24, 1974, again at the was a kid was the basement in the “ old Sterling Models, Inc ...... 53, 54, 55 Lucas County Recreation Center, Mau­ home place,” which also doubled as the Su-Pr-Line Products ...... 69 mee, Ohio. For further information on furnace room and garage. Plenty of Tatone Products ...... 55 this 20th annual truly biggest R/C room, and I could even run the ignition Victor Model Products ...... 69 “ shew” on earth, write to the Weak engines down there without too many Vortex Model Engineering ...... 62 Signals R/C Club, P.O. Box 5772, complaints from the folks . . . o f course Williams Brothers ...... 51 W indspiel M odels ...... 67 Toledo, Ohio 43613. · there were layers of blue smoke from

DECEMBER 1973 71 No. 673-OT ALBATROSS $3.75 No. 7721 FAIRCHILD 51 $3.00 FULL-SIZE PLANS Class C gas ship designed by George One inch scale Classic for R/C. also F/F SERVICE Reich. Redrawn by Phil Berhardt. gas or rubber. By Hurst Bowers (with instructions) No. 6733 HUNTINGTON H-12 $1.50 No. 7722 SAM 5 S2.50 Rubber scale model of first US home- Top-notch competition Nordic A/2. Full built. Span 19". By Walt Mooney. wing plan. A winner. By Ron Evans No. 12731 QUASOAR II S4.50 No. 5732 WOODWIND $2.50 No. 7724 TRAVELAIR 2000' $4.00 Beautiful 12 ft. span, V-tail, R/C soarer. A/2 glider with sturdy, warp-proof, all­ Two inch full scale Classic R/C biplane. Spoilers and air brakes. By Niel Liptak. sheet wing. Span 78" By John Krouse. Proven flier, 60 power By Bill Northrop No. 6721 WAKEFIELD $250 No. 12732 PULL Q S2.00 No. 5733 TEA KETTLE $1.50 Highest placing U.S. entry in 1971 Easily built A/1 Nordic. Span 56-1/2". Twin-boom pusher for the Brown CO 2 Proven contest winner. By Jean Andrews. engine. Span 15". By Daniel Walton. World Championships. 8y Bob White No. 6722 MONGSTER $3.50 N 0 . 5 7 3 -OT-I AERBO.020 $2.00 No. 1273-OT INTERCEPTER S2.00 Replica of 1941 Class A Nats winner. Two inch scale quarter midget EAA type An .020 Replica of popular Goldberg de­ Span 30". Redesigned by Phil Bernhardt. biplane pylon racer. By Ed Nobora sign, kitted by Comet. By Wayne Cain. No. 4731 BRIEGLEB BG-12 $3.00 No. 6723 CALIFORNIA COASTER $350 Easily built 100" scale sailplane for slope All sheet balsa R/C soarer featuring a 9 No. 11731 BIG JOHN the FIRST $5.00 or thermal soaring. 8y Chris Christen. foot Jedelsky wing. By Mat Tennison Modified prototype of editor's notorious No. 5721 SEAHORSE II $3.75 monster R/C biplane. By Bill Northrop. No. 4732 ESPIRITU DE SAN LUIS $1.75 Single or 2-channel semi-scale using Sig Excellent trainer, designed for land or No. 11732 BUMBLE BEE S2.00 45" foam wing. By Dave Thornburg. sea, 19 to 35 pow er. By George W ilson C/L Combat ship for .35 power. Features No. 5722 HUMMING BIRD $3.00 No. 4733 PEA POD $3.25 foam wing construction. By Phil Cartier. Radio controlled F/F Scale early English A 36" long R/C sailboat easily made of lightplane, .049. By Walt Mooney No. 1173-OT TRENTON TERROR S3.00 1/8" Luan mahogany. Clever sail control. Gas job from 1938 Flying Aces. Span 6'. Full size patterns. By Tom Protheroe. No. 3721 YANKEE GULL $3.75 Expandable R/C soaring glider with 8'- Simple lines. Redrawn by Phil Bernhardt. No. 1731 SPROOSE GOOSE $4.00 4" to 12'-0" wing span. By Le Gray No. 10731 SUPER DOUBLER S4.00 EAA type R/C sport biplane, mostly Shoulder wing, pylon racerish sport R/C spruce, for 60 engines. By Bill Northrop No. 2723 E-Z BOY 52.75 Half A competition free-flight for '72 for .35 to .40 engines. By Brad Shepherd No. 1732 SPECTRAL $2.25 rules and all modelers. By Al Vela No. 10732 SCALE EDO FLOATS $1.50 Single channel R/C soarer, 57" span, Scale floats for Lanzo Puss Moth or your weighs 8 oz. Easily built. Andy McAfee No. 1721 SHOCER $350 Hot Class A/B Free Flight contender for favorite ship - 22" long. By Hal Cover. No. 12721 DON QUIXOTE $3.00 1972 Rules. By Mel Schmidt No. 1073-OT GOLDBERG ZIPPER $3.00 An 85" span R/C glider of classic lines. M ost fam ous o f all O T gas models, ended Easy to build. By Dave Thornburg No. 1722 PUSS MOTH $3.00 Chet Lanzo's famous rubber F/F scale cabin era. Redrawn by Phil Bernhardt. No. 12722 TOAD $3.00 Puss Moth returns1 By Hal Cover No. 9731 QUARTER MIDGET P^O $3.00 One-design pylon racer for .40 engines. Easily built R/C model of famous fighter Also for sport flying. By R/C Bees No. 1723 WHITE TRASH S3.00 for racing, sport, stunt. By Jack Sheeks. No. 12723 FORTY-NINER $1.50 A proven, trophy winning R/C sailplane with 7 and 10 ft span. By Rick Walters No. 9732 FAIman 7 $3.00 Great little all sheet balsa F/F sport rub­ Small but potent power ship for .09 eng. ber model. Span 24" By Dave Thornburg No. 12711 CURTISS-WRIGHT JR. $3.50 Simple, inexpensive. By Bob Stalick No. 11722 SEAGULL $450 Two inch scale model of famous pusher light plane. R/C By Ralph Fidance No. 9733POU DUCIEL $1.50 R/C flying boat amphibian for .29 to Cute little all-balsa semi-scale model of 45 engines. Span 27" By Neil Whitman No. 12712 TWIN TRAINER 53.00 famous homebuilt. CO j. By Dan Walton. No. 11723 SKYRAIDER AD-4B S1.50 Sport R/C model for two 30 to .50 Rubber powered, 27 1/2 inch free-flight engines By Bill Northrop No. 973-OT SPOOK 4B S3.00 scale. Great flyer 8y Walt Mooney No. 11711 NANCY $2.75 Well-known gull wing design qualifies for Scale-like. 96" span R/C glider featuring Antique Old Timers. By Snyder & Muir. No. 10721 STEPHENS AKRO 54.00 R/C Standoff scale of popular aerobatic easy construction. By Jack Elam No.8731 FOKKER D-VI S4.00 ship, for 35- 40 eng By Brad Shepherd No. 11712 BI-PRENTICE S2.75 WW-I biplane fighter at 2"=1' scale for Training type R/C biplane for fun flying. R/C and .40 engines. By Philip C. Foster. No. 10722 MINI - FAI $2.00 High performing .010 powered miniat­ Uses 29- 50 engines. By Bill Northrop No. 873-OT 1931 RUBBER MODEL 52 25 ure F/F. Only 24" span. Loren Williams No. 9711 BEANPATCH $3.50 Record setting 1931 fuselage rubber job. An EAA scale-like model for sport R/C Span 38". New plans by Phil Bernhardt. No. 9721 COLEEN 12 $3.00 Graceful 8 ft. V-tail soarer has slope or 45 power. Bv Bob Upton No. 7731 L.I.A.H.O. $2.50 thermal wing plans. 8y Randy Warner No. 9712 FAIRCHILD 22 $2.25 Trike geared pusher R/C sport plane for Cox .049. Different! By Bob Janiger. No. 9722 BABY BOOMER $1.50 Scale old-timer for single channel radio Twin-boom sport free flight pusher for or freeflight 020 power. By Tom Laurie No. 7732 SQUARE CAT $2.50 .020 power By Art Reiners Easy building profile carrier C/L for 36 No. 9723 LITTLE TOOT $3.50 Price includes Third Class postage and engines. No gimmicks. By John James. Semi-scale R/C bipe for 40 engines. reprint of building instructions. Add 35 No. 773-OT LANZO 8' GAS MODEL $4.50 Great performer1 8y Denny Elder cents PER PLAN for First Class postage Chet Lanzo's famous "Record Breaker." No. 8722 COUNTERFEIT. A/1 S3.00 Add 50 cents for orders outside of USA Two large plan sheets. By Phil Bernhardt. High performance competition A/1 Nor­ CALIFORNIA RESIDENTS ADD 5% TAX. No. 6731 WACO YKS-6 S3.50 dic flying wing glider By Bob Provart SEND TO: THE MODEL BUILDER Winner of 1972 Nationals F/F Scale Gas No. 8723 TAYLORCRAFT, F/F $1.50 event. Span 33-1/4". By Bill Warner. Rubber powered, 24 inch scale seaplane. PLANS SERVICE No. 6732 DRAGGIN' FLY S3.50 An excellent flyer By Walt Mooney 1900 E. EDINGER AVE. Lightweight R/C glider for thermal soar­ SANTA ANA. CALIFORNIA ing. Wingspan 7 feet. 8y Duane Hyer. 92705 stand before it. This was not only the workshop but dope fumes permeated an eighl-by-ten room or basement space ham radio “ Shack” and electronics the house. Then a house with a full (providing it is dry) is enough to keep a workbench, but also the model airplane basement . . . I sprawled models all modeller happy and content for years. shop. Nice and cool in the summer but over the place . . . it really was heaven. Right now, we are in the process o f very, very cold in the winter. Although Now my workshop, at the very best, building a new home. The entire house I had a small electric space heater down is a total mess, but what pleasure to will be just as Sweet Emily wants it.. . there, I never could keep my feet warm have all the room you want. I know but the workshop is mine! A ll mine! A and to this day, whenever I think o f many modelers who work o ff bridge good dry basement room, fifteen by that workshop, my feet ache from the tables or converted closets and my twenty, with heat in the winter and air remembered cold. heart goes out to them. I guess lots o f conditioning in the summer. Who could Years passed and I finally moved . . . wives and even home builders don’t ask for more! After all, they say that this time an unfinished room was the understand modelers need space. Usually happiness is a big workshop! ·

72 MODEL BUILDER Performance you can measure

The selector knob on this new photocell tach allows the user to select a 0 -6,000, 0-15,000 or 0-30,000 RPM setting. The meter’s increments vary from 100 on the 0-6,000 scale to 400 on the 0-30,000 scale.

The tachometer probe houses an extra-sensitive photoelectron cell Most modelers know they do not need a ta­ which is capable of obtaining read­ chometer to tell them that their Merco engine ings with a minimum amount of light. Just hold the probe about 6 delivers performance and reliability; or that it inches from the item to be tached is economical on fuel; or that it delivers and it does the rest. The probe smooth, consistent carburetion from idle to that holds the electron cell will “ top e n d ” . extend to a length of 6 inches thus allowing access to hard-to-get-at Beyond having confidence in an engine, how­ places. ever, it is useful to know which propeller pro­ vides the best RPM, which fuel delivers the most power or which glow plug produces the best performance. The new Royal Tach can accurately answer these questions and can do so without ever touching your engine, its photoelectric cell senses light waves inter­ rupted by an engine propeller or a boat/car flywheel and thus computes RPM. See the new Royal Tach or the Merco line of engines at your dealer today and when per­ formance counts, watch for the Royal trade­ mark.

ROYAL PRODUCTS CORPORATION 790 WEST TENNESSEE AVE. DENVER, COLORADO 80223 MODEL RECTIFIER CORPORATION · 2500 WOOOBRIDGE AVENUE · EDISON, NEW JERSEY 08817

Performance That Circles The Globe

Ask the modeler who flys an MRC-Enya engine. We've no doubts that whether heflys the smallest MRC-Enya .09 or the largest .60, he’ll tell you that MRC-Enya is a name that guarantees reliable performance. That's the MRC-Enya family reputation— a reputation generated over the years by the Enya brother's pride in crcftsmanship and their expertise in engine design, metalurgy, manufacturing and quality control. It's also your guarantee that when you choose MRC-Enya for just plain Sunday flying or high level competition, you're choosing an engine that will provide unquestionable power and reliability that will last year in and year out. Long lasting performance is a family trait.