4 Classic Flying Models

7/27/2019 4 Classic Flying Models

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. . . . . . . . . . . .HE NEW RULER/StruckAm TRAIIS contest ~ree- i~ ightas iob from AT Apri l 1940

FlyingZIPPY/Kochman . . . . . . . . . . . . . . . . . . . . . . . . . .Control line semi-scale from AT 1951 Model Annual

VOLUME 3/NUMBER 2SUMMER/1979

It should b e noted that all advertisements inAIR TRAILS CLASSIC FLYING MODELS arevintage ads and not current advertisements forgoods or Services.

ED SCHNEPF PublisherMICHAEL O'LEARY Executive EditorRICHARD MILLER Managing Edi torSEAN GREENWAY Associate EditorBOB RATNER Production DirectorRICHARD X. LANG Executive Art Directo rRICHARD GEHRUNG Graph ics DirectorSVEN CARLSON Circulation DirectorJIM BUCHANAN Circula tion ServicesDAN WHEDON Promotion DirectorJANET GRAHAM Subscr iber Service

PATRICK H. POTEGAAdvertising Director7950 Deering AvenueCanoga Park, California 91304(213) 87-0550

KAREN R. LAMONTIAAdvertising Coordinator

NATIONALS FLYING SCALE WINNER/HammerRubber scale Piper Cub. AT April 1940PUSH-PULL/Schoenfeld . . . . . . . . . . . . . . . . . .Unique rubber contest model. AT August 1944AIRHOPPER/Orzeck . . . . . . . . . . . . . . . . . . . . .Tow-line glider. AT.;anuary 1940GRUMMAN XF4F-2/Dickinson . . . . . . . . . . . . . .Scale drawing of the first WildcatBEECHCRAFT BONANZA/Thomas . . . . . . . . . .Solid scale from AT March 1947

TOWLINER "CU/Cleveland . . . . . . . . . . . . . . . . .Sport glider. AT 1951 Model AnnualYOU, TOO, CAN FLY U-CONTROL/Smith . . . .Lessons On flying control line from AT 1951 Model AnnualSKETCHBOOK/Staff . . . . . . . . . . . . . . . . . . . . . .Helpful model hints from AT August 1950PARLOR MIDGETIThomas . . . . . . . . . . . . . . . . .lndoor rubber model. AT 1951 Model AnnualBATTLING BOXCAR/St ruh l . . . . . . . . . . . . . . . . .Sport rubber model from AT 1951 Model AnnualJERSEYETTE/Ehl ing . . . . . . . . . . . . . . . . . . . . . .Free-flight or U- contr ol Sport plane. AT October 1948SECRETS OF SPEED/Becker . . . . . . . . . . . . . .Rubber speed model. AT September 1939THE EXECUTIVE/Staff . . . . . . . . . . . . . . . . . . . . .Twin Jelex powered transport. AT 1952 Model AnnualCONSOLIDATED B-36 BOMBER/Thomas . . . .Solid model of 8-36. AT 1952 Model AnnualJUNIOR JETS/Staff . . . . . . . . . . . . . . . . . . . . . . .Simple jet models. AT 1952 Model AnnualOLE SLIPPERY/Smith . . . . . . . . . . . . . . . . . . . . .Semi-scale control line racer. AT 1952 Model Annual

. .ORLD'S FASTEST MODEL/Temte & ThorSpeedy jet from AT 1952 Model Annual

. . . . . . . . . . .OSCA FLYING SCALEIThomasFamous Russian fighter. AT May 1942

. . . . . . . . . . . . . . . . .-51 FLYING SCALE/StahlWWll rubber scale fighter. AT June 1946

ADIO CONTROLLED FREE FLIGHT M O D E L / SHow industry used giant R/C Jobs. AT July 1946

ATIONALS SENIOR FUSELAGE WINNER/Bai leContest rubber from AT May 1939THE AMERICAN ZIPPER/Kahn . . . . . . . . . . . . .Sport rubber model from AT May 1939

. . . . . . .ELECTING YOUR GAS ENGINE/PolkGas engine line-up. AT May 1939


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Henry Struck's New Ruler British RNationals Flying Scale Win ner Sec

Ernblsmatic of spring acti vity arnong model builders everywhers, we show Paul Karnow measuring Charles


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prevent the covering from sticking tothr inner f rame. Ceinent the eockpitruwl of sheet to tlie top longeroii.Sto istrn the outsicle of the woods l ightly to avoid spi i t t ing and bend i tover the formers. Glue the nosehulkhead of i/l,T plywmd in placean


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Now onl3'4"Over 7.000 GH Q Gas

Engine Kits were sold at$8.50: Over 15,000 soldlast year. Now is you r chance tobuy the New Improvod Kit for$495. Absoliitely complete withcoil, plug. gas tank, etc. Send only$1. Shipped Express Collect forbalance Same day.

the coil and the, other grouiitled.Tlie motor and nose bulklieads sliouldbe eitlier ~lope d generoii~ly or var-nished t o protect them from tlie ef-fert s of oil and gas.

Sext rnonth the wiiig anil tail con-str urt ion will be detai led. IYiitil tlien(loii't get so impatient that you startthe niotor and enter the fuselage in amidget auto race!BILL OF MATERIALS(For fuselage and motor unit)All st n p balsa shoiild bu hard an dstr aig ht grained. ,411 sheet bahnshoiild be light nnd qiinrter groiiir(1.6 W sq. x 48'' Longeroiis7 X f/4 X 48" stringersG L / l o X ?,! X 36" stringers2 l/'" sq . X 36" stringersG I/ X !& X 36" beacling3 X 3 x 36" biilklieads, pglori flmr1 V,,; 3 x 36" pylon top, headrest1 '/4 X 3 X 36" pylon formers. head-

rest. sternpost

I l/; X 9 X G" plyanod nose bulk-Iie;id antl Oattery track giiicle

1 X 1 X 16" ply\\.~ker 1111tc1rct;iiiir,i.-1v2 yards silk'/2 piii t ~ a c hf criiiriit aiid rlitlr,1 [mir of airwheela. i.iiziiit~.viiil. < ~ I I I -

(Irii.wr, tiiiier

What's YourAll Po m F1nish.d o d Gmaraar..d.

Wo M.cbrlcol K m w l + e Roquird.All Mochimieg D w .

1/5 HorupowuFor Model times. hais. Mi&.( Can.

I

I Answer The Seversky P-35 iises 0f the '~iafier Jr ' d u h m11) Ill~.na).d o% -1-3c pratt & wh1tney taln-row wasp bought from Dana DarlingP C; >1 1 The drawinas of the ship appear in Iiarnburg*Average owombly iime 30 m1i.t.rOWLY A SCREW DRlVER WEEDED

D.al.ri W

I &kQ.OTOIS4OTbl &t, New 1 the 1939-40--issueof Air PrD&ss. Answer: The date aiid lu


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CUT WlNG PLAN BETWEENTHESE TWO RBS-


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SiRONCER, REWTORCEDM I N W U R E

CELLULOID MOTORpururi 1%4 2 NCM-

TME FALCONCLASS . . ... . . . Aznaab.mChw4"-

The aristocrat of gaa models. Depend-able, Rugged, and Nuit in appearann.Mount your clase A motor in the F A LCON, suin it up end be thriUed at itstake &. climb. end milplane glide.With the FALCON'S simplified mono-coque and sheet balsa covered devatorc o ~ v u c t i o n t is practicauy indestruct-iblc. Other featlreri are: Easy accessi-biliiy to motor and ignition, and a wingr h i c h will slide in event of collision withi r e a . n c .

Nationals Flyini Sesle Winner l 1Iii in;il,iiig tlie laiirliiig grar atrot.t]i


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TEE GRUMMAAI XF4F-2 MIDWINO By Martin


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METAL PROPELLER

POSITION LICHT


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YOU, TOO. CAN FLY U-CONTROL


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Horizontal tail area should beabout 25% of the wing area and theelevator about lh of this area as pre-viously mentioned.Vertical location of the bellcrankin the fuselage affects the stabilityand control of the model and its lo-cation should be close to the line ofresistance of the model. Since theactual position of the line of re-sistance can only be approximated,suffice it to say that a good compactgrouping of al l forces will result ingood stability. The ideal set-up isa mid-wing model with thrust line,chord line, center of gravity, pivotpoint all on one horizontal line. Inhigh-wing models the bell-cranklocation should be between thethru st line and the chord line. Inlow-wing models the Same generalrule holds except the bellcrank willbe below the t hrus t line usually.

The question of power is next onth e list. Control-line models alwaysneed plenty of power. If your modelis fairly heavy you're going to needlots of power. Power creates th ecentrifugal force that keeps themodel out on the end of those wireswher e you want it. If you tr y to flyin a good breeze with ap under-powered model your troubles willmultiply like rabbits, but with morepower the Same ship can bat rightthrough with little difficulty.The power you can get out of theengine directly depends on the pro-peller. Most engine manufact urersgive recommended propeller sizesfor control-line flying with theirengine. You will find the propelleris always of small er diameter andgreater pitch than that needed forfree-flight. Some experimenting withslightly different diameters andpitches will soon show you whichpropeller suits your engine andmodel combination.

Control wires should always bekept free of kinks and twists -unroll

handle gives a neutral elevator posi-tion. Have a little tension on thewires when doing this.

So far we've only been going toground-school, but have patience,we're going out and fly in a little bit.Before we do, however, one morepoint must be emphasized. If all thetroubles with gas model flying werelaid end to end they would add upto one thing-soldering. S o do agood soldering job on the ignitionSystem and have some fresh bat-teries handy when you go out to fly.If you ar e using a diese1 type engineor the glow plug set-up, spend sometime familiar izing yourself with theproper throttle settings and chokingnecessary bejore flyihg.

Yopr best bet for first-time flyingis a gentle breeze, so pick a day withcalm air. Because the wind tends todrift the model inward in the up-

('OSTROL LlSE DERIGS PACTORHWinp Ludinp (02. psr 100 84. in.)

Rliort . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 - ~ ? 0. . . . . . . . . . . . . . . . . . . . . . . . . . . . .t i i i i t & 12. . . . . . . . . . . . . . . . . . . . . . . . . . . .peed 20-($0 +Power Loadinp (W. prr eu. in.)

.. .. . . . . . . . . . . . . . . . . . . . . .w r t .. .1W-80. . . . . . . . . . . . . . . . . . . . . . . . . .tunt 8tI- i l ). . . . . . . . . . . . . . . . . . . . . . . . . . . .need . d H i O

Aspact Ratio. . . . . . . . . . . . . . . . . . . . . . . . .pni l 6 : l

sruilt . . . . . . . . . . . . . . . . . . . . . . . . X:l. . . . . . . . . . . . . . . . . . . . . . .weli!te but reurcnenl

rverage raliies th it ran srrve as ml e of tlidmh"deslgn hasls.

wind s ide of t he circle, control canbe lost because the lines will goslack. When the model gets arou nd

maintain control. Wtake-off around fside of thfrom nosately afteMake amodel aneverythinwires fornection aarate linCheck mif any. Huse boostgine andmost engrich on tup whenthen lean

Get set that wiregive helponly wheerage grtake-off iis used frmodel wthree-poiclimb. Ois increasprevent abe neutrathis. Righof all fotendenry ways resZooms anfeel hi s cthe amouOnce setdifficulty the flyer flying, alwind andready to out of th e

In addithe wind to balloon


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sketchbook % ,HAVE YOU DEVELOPED SOMETHING NEU excev \IN CONSTRUCTION. CONTROL. 01 FLYINGTHAT MlOHT INTEREST OTHER MODELERS?SEND A ROUGH SKETCLWL'LL REDRAWIT AND PAY S2 COR U C H ONE ACCEPTED


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GRAIN VERTICAL 1

- - - I _ - - - ---.--------L-

SPLICE SHEE


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control elevator. The control iiiechanisiii is added tothe ship in conventional iixinner with the bellcrank

pressioii diesel head. Ariioiigcan fit this simple ship are th


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niounted oii platform directly at the ceiiter of gravity.Aiiy of the standard niethods inay be incorporated

to cut off the glow plug or diesel engine. Shown isthe D-E fuel ciit-off niounted witli an Austin tiiiier.The same landing gear is used for all types of flying byU-contiol or- f ree-fiight f roiii land or snow. The slightchange for float Comes with the substitution of braceC in place of B. Wire C is placed directly below therear wing strut. Landing gear wires should be boundto fuselage Cross mernbers and longeroiis with heavythread, then given a liberal coating of cenient.

Mr. Eliling's first Jerseyette was lmwered by anArden .I99 engine equipyed with a D-E variable com-

.23, the Torpedo, Ardeii .099Tlior, Huzz, or Bantaiii-to smaller engines would be fothe larger oiies nientioned areflight or control-line work.

The size of tlie cowling wiof eiigine selected as indicateding iiiay be carved froin a sinsiifficient size, or it can be buthick sheet balsa i f the modec-ase, a cowling will add iiiuch Jerseyette arid will provide proii i event of crashes.

1 2 - 5 / 1 6 ' ' ~132

E X CE P T FOR E NCIRC LE DM E A S U R E M E N T W H I C l iS HOU LD BE 3- 1 /16 . FOR56 1 B FLOAT BRACE 'C

B E F O R E B E N D I N G

2 5 / 3 2 . '

- . 6 . i / 2 . -+


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FUSZ

P

f1%8-P

LO

AC

B

AM

O R

PUBLUO&FA

B

C

GN

AAWINT

R

H

WHW

N

PU

--


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The configuration of Mr. Butter's Dyna-Jet p owered record holdi ng modelreprewn tr one of iw o prsvailing schools of thoug ht on the design of ietrpeed jobs. One groop favors the stumpy fuselage w ith fuel tank carvedinside the "hul." The other favors the Iong. tape red nose typ e of modelrepreseiited b y Bunting's rhi p below. Record is curren tly held by Butter-type.

Harold Bunting's "Super Squirt" is a reiinement of his original record-set-tin g Dyna-Jet powered speed model which racked up its national recordback when j et i were iust beginnin g to g et established. This one shown hereweighed I 9 01.witho ut fuel, al l surfaces set at Zero. Tank capa ci ty 2.25 02.;engine powers rnodel for 16 laps be fo rl tank runs dry. Maximum width 1.3 in.

Juniori The "minimum" the quest of the jetis pretty generally bgine would fly itsenicely with the addilizing vanes, jet mchopped down, dowSingle stab jobs hawithout much succmuch disappeared frspeedster asks is a she can skid his modations in design tretwo record-holding mventional ideas on

Since the introduction modelers have been experigine. So fa r most successfu


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Ole SlippGood way of qettinq star ted with teafamous design-more requested than

i eam racing is probably the best thing that hashappened to control-line flying since glow fuel was. ~ -introduced.

If you havcn't tangled wires with other racers yet,"you haven't lived." Som e build ers have stayed awayfrom th e sport because it looks pretty complicated atfirst glance. We won't deny this, but as every contestminded modeler knows any phase of model compe-tition puts a premium on performance of both modeland flyer. Team racing is no different, and that littleextra effort is well iepaid when the checkered flagdrops on your model. Once you try it, you'll buy it. from one ounce of tiger milk


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World's I?PModel By GLENN TEMTE and B

8 This is the jet that did 179.03 mph to set a new na-tional record which has never been exceeded despitechanges in rules or the influx of new enthusiasts to theDyna-Jet powered circle.

Construction of B.J. V1 is along conventional con-trol model lines. If anything, the building of a jetmodel is a good deal simpler and faster. Use goodwood and try to build as strong and yet as light a shipas possible.

Select an appropriate sized block of medium balsafor the fuselage and saw to side and top outline, be-ing extremely careful to cut in the wing incidence atZero degrees. The model is set up for clockwise flight,but there is no reason why it won't fly equally well ina counterclockwise direction if the necessary changesin gas tank and bellcrank leads are made.

The wing is of very conventional construction. Thespar is of hardwood lying flat along the top. A hick-ory spar cut from an old ski has worked out well forus. From medium-hard balsa cut out the bottomof the wing panels, and on them assemble the ribs andspar in their proper location. Install the control unitsin the wing, screwing the mounting bolt only farenough down to hold the bellcrank assembly in place.Cut the top wing covering from 1/16 " medium balsaand glue in place. When completely dry, sand care-fully to final shape.

small block of aluminum in pout a hole for the tie-down substi tute for the block of alu

Drill the hole through thfasten the engine in place wsnugly, but do not use so mucis distorted. Check this bolt bis to hold the engine in the mit is kept snug. There are no sthese are taken care of by the

Your completed model shoborhood of 25 to 27 Ounces. .016" flying wires in good conshould leave the handle a t ainches apart. In flight, these twenty pounds and while thconstant, and near the end ofably be very happy when theis sufficient for about twentynitely a good workout on a w

We have always favored any type will work if some prporting the long nose of the mfit snugly in a horizontal posiwing 6umpers of the dolly inches above the wing leading


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l o s c a f l u i n u S c a l e . .


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haads wi th thin ,harnt-bolso fusolaqms o r a r in g p r o v id o a jo b t h i t w i l l s ta n dup indefinitmly. I t Ries r o l l . t o o .

A veteran of Spanish, Chinstubby 1-16 fighter makes

H AVI N(; seeii actiial servizc tlie Spaiiisli civil war, tlie1-16 tighter is iiideetl a veteiavorahle az to its perforiiiaiiceliiies aiitl tlie sriiall tliiiieiisions~>rol>rrtioiisf otlier pursuit crengine of Anierican design anslmnsible lor tlie Iiuge cowl. To300 tri. p. Ii., and tlie landing spprising for a plane of such linii

Froin the standpoin t of flyiiMosca is not tlie very k s t seltliat could k clesired. The iiiodheilig eiitirely slieet-l~alba-coverof the original periiiit tlie use of cleuiations heiiig iiicreased dihe

The fiiselage foriiiers are cut of soft slieet ceiiieiited to crossetl. Spars 'are joiiied hy forcenwnt in place. aiid tlie coithe rear uf Fornwr B. Foniietlie four stringers, and tlie aoit 'sectioris. (:owl front is ioriiiedrear tuselage tip ia a hollowetl lis also sliapetl of halsa. 1 )o v

Assenihle tlie ribs tu the s p riiig edges, fittiiig their inner edgtlie tips aiid the lower. triangulariiig-gear s truts of .W steel n-irhraces to tlie wing iranic. I> i i i rto tlie wiiig. Attacli tlie Iiartlnleading edge to tlie spar with sotire wiiig fraiiies liglitly. l la kfairirigs, triniiiiing tlirni until tlInlsa outlines aiitl pin aiicl ceiiie

Tail surfaces are of coiiveiiiiok finished antl coveretl a i t l i tiiiiented to tlie fiiselagc. Wiiigwitli tissue. watCi tlopetl. aii[l tliiii tlopr.

FULL-SIZE PLANS of th is model may be obtained by sending fiheen ceAIR TRAlLS FULLSIZE PLANS, 79 kv e n th Avenue, New York,


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B u i ld one f o r t h e g u y w h o l e a rn e d t


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Here's a deluxe scale model of the trainer plane in which amillion Army and Navy men learned to f ly.

You ge t this kit , packed w ith a handso me il lustrated instruc-tion folder show ing how it can be assembled quickly andeasily. Varney's precision parts, inolded from chrome yellowand ebony plastic, Slip into place . . . and s tay. In almost not ime a t a l l you have th is super -deta i led model , g leaming

in its satiny finish, looking jiist Several unique novelty suggest

trated folder packed in the kit . shows how you can fasten the assof plastic bent in to a grace ful curv

See your dealer today. Ge t one oModels . Build i t for the guy w h o lea

(Wingboth A


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P-51FLYI

SCby EARL STAHL

FLYING SU LE W l f nAN D EN DURANCE TYP

O S S E S S (~ )R S f soiiie of tlie niost brilliaiit fighting recorcls ofthe war, the 1 '-51 Mustangs blazed a trail of dest ructi ve gloryt l i rougli eneii iy skies. Part icular favori tes of All ied airnien , theywere feared a nd respected I>y the G eri i ians and Japanese.Attai i i i i ig greatest acclai i i i as long-range f ighters, squadrons of>lustai igs t~ecam e ai ii i liar s igl i ts over nerl in and T ok yo as well asotlier reiiiote targe ts. Used ii i great iiuiiibers, first as escorts ior theIieavy I)oiilbers, wlieii they were niakiiig de ep pen etrati ons into eriemyter rito ry, tliese aerial te rro rs were later tised tactically in offensesagainst grciiiiid installatioiis, siich as supply tlumps and transportationfacilities. \Vlieii flying protection fo r the boiiibers, rang e was in-creasecl 1)- carryirig fiiel in exteriial taiiks beneatli the wings. and thenoriiial ariiiaiiieiit consisted of six SO-caliber niachiiie gun s. F o rsweeps against ground targets , rockets and bombs were niountedI>eiieath tlie wiiigs. All in all, the sh ips packed a dea dly wallop re-gartlless of tlie iiiission for whicli tliey were outfitted.

liefere tlie Lnitecl S tate s eiitry iiito tlie wa r, the 3 lusta rig wascoiiceiverl hy North Anierican Aviation in response to Britain's cryfo r a Iiigli-lxrforiiiance fighter. T h e plane tliat resulted proved sosat isfactory t l iat i t was adopted hy our A rm y as one of our top f ighters.Tl ie original P-51 was lmwered by an All ison engine for f ight ing atlow altitiides. Init it was n ot uiitil tlie Pack ard- built Roll-R oyceei igine was used t l iat the higl i -al t i tude, long-range perforniance oft l ie ~xe sei i t -d ay l i ip was at tai iied. Actual ly, the hlustai igs that saw

Service in the closing days of t l ie wainal. Aside froni the changes in f igthrough experience and the changingal tered by the new engine, the bubble the high speed N A C A laminar-f lowappear unchanged.O u r niodel is of t lie latest Mustangplaced on flying ability, it is accurmakin g an unusual ly at t ract ive displat the drawings and photos may give diff icul t , but the opposi te is t rue, fomethods are employed and even the cmade q ui te easi ly.Exper ience has denions t ra ted tha t lf ly well and the P-51 M ustang is nopor t ions hav e been worked o ut careweight is not al lowed to become exceexpected.Before s t a r t ing to bui ld . s tudy the dplete mental ~ ic t t i r e f each problenithe rew ard will be a neat- app earin g,

In se lecting materia ls for. you r mBalsa wood, whicl i comprises most ofirm stock. Reg ular colorless riiodel the members.T o bui ld a ful l-size inodel, i t drawings to twice the printed s


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P SSESSOKS of soiiie of tlie niost brilliaiit fighting records oftlie war, the I'-SI Mu stan gs hlazed a trail of destructiv e glorytlirougli eneiiiy skies. Par ticu lar favo rites of Allied airme n, theywere fearecl and respected by the Geriiiaiis and Japanese.Attaiiiiiig greatest acclaiiii as long-range fighters, squadrons ofJl i istai igs becanie familiar sights over Berlin and To ky o as well asotlier reiiiote targets. Lrse


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hether or not a good job has been done.With this in iniiid, carefully saiid all thrfram es ui i ti l they are Bawless. In thisconnection the author likes to sand tlieiuselage fornie rs s l igl i tly s ial loped sothe stringers oi i ly wil l touch the paper;this makcs fo r a niuch hct ter job. UseI I hariana oil or very light dope to stickthe paper to the i ranies, ai id where com- /pouncl curves eiist. emplov niany small. ~01 the tissue. neatly lapped toavoid unsiaht lv wrinkles. Thi s takes>1 more tinie, of course. but the results are 1worth i t . .4 fine ni ist of water sprayedon the coverine will tiahten it but do notapply any dope ui it il the a ho le ni d elis assenihled.The fiiial asseinbly is eacy. I I thew rt 5 have beeil made wit li care , wineand stah iiizer n.ill slip right int; placeat the proper aerodyiiamic aiigles as thiswas ~ redetermi i i ed a l i an thcm care lu l lv. -I I helo;e cimenting last . T o make tl iefillet niake tlie sheet balsa partsand fit them individuallv to ruu r/ ni de l . Cover the fi llet arid ho; tom 1ow ntn g with niatchi i ig t issue. Cementtlie vertical tail last at a ' l ight offsetto the lel t (leading edge ) Ior a rightturn to help overcoine toruue. S o wI ( neatlr fit a iissue fillet hctwieii tlie tail 1surlaces. .At tl i is t ime. one or tn o coatsol cicar dope mav Ix apulied tu theI N o r . POWER-1'1.1 X. leader in advonced moael acceiiorier, brings you an ,gnitiontoll Ue s1 9~ d nd engineered crpecolly lor modern ir < " 'rurer ote' Extremely high e f f c i c n r ~with Iow drain bec ., , , ,, Is ize 2" x weight 2 az. Comes com~lete it h hi-tenhion leod Com pletely en-cased in waier ond ai r resistonf Gokelile hell A POWER- / , / , s WO+ I1'1 11 igni


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Tlie laiiding gea r is niade ot baiiihoo. Tlies t ru t s make a V. the apex oi wliicli is at tlie cloublecross-piece at tlie to p of tlie tuselage. Add itionalstrengt11 is o1,tainecl by bin din g tlie st riit s to tlielower fuselage longerons with tl i read. Pu t the two-inch-diameter wlirels in place after t l ie glue holdingthe ax les and s t ru t s has d r i ed .The landing-gear at tachinent was the las t opera-tion before covering. Tlie fuselage should be cov-ered with a good grad e of t issue. ITse banana oilto at tach i t to the loi lgerons and cross-pieces. (Y ounlay use a double cover ing for aclcli tional s t r en gt l ~.)After t l ie fuselage is covered, Spray tl ie paper withwater . Af ter i t is thoroughly dr y, paint i t wit limoclel dope. Sp rap ing the papcxring with wate rinsu res a tigh t cove ring with a miiliiniiin of wrin -kles. Do pi ng increa ses tlie streilgth of the fuselag e.

WlNGT h e wiilg of thi s model is of the regu lar con-struction and is of the polyhedral type.Make a teii iplate of t l ie r ib section oi hard balsaaild cut out twenty-seven ribs froiii 1/16'' soft sheetbalsa. T h e f ront spar is % X G'' edium-hardbalsa, the rear spar is %'' Square balsa. (N ot et l iat the spar s lots in the r ibs are deeper than t l ies p ar s. T h e y a r e n ~ a d el iat way in order to keep asmooth siirface aite r t l ie wing is covered.) S h e-leading etlge is %" sqiiare aild the trail i i ig edge isX %'I.1,ay the spars on the fi i l l-size drawing of thewing and cenient the r ibs ii i place. After th ecement has dr ied , attach tlie leatling and tapei-edtrai l ing edges. S h e t ips of the tapered %" sheetbalsa are then cemented into place. Cut the spars ,

an d l e ad i n g a i ~ drai l ing edges at such an an gle thatthe prop er d ihedral of 5" under each tip is obtained.T h en ' /3n" thick sheet gussets should be cementedto each s ide of the m ain spa r and t rai l ing edge inorder to i i lcrease the strength of the joints .


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L T H O U G H t lie Amer ican Zipper is comparativelyA sinall, it is unique in that it possesses the qualitiesof a contest ship. Its fast rate of clinib and flatgliding angle are a conibii iation always hoped for butseldoin realized e ~ e i iroiii contest ships. O n a caliii da v, T H


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ithoiit tlie aitl oi tliei-inals, tlie iiiodel was clocked tothe t~ i i i e ~ foiic iiiiiiute aiitl tliir ty sec ond s. 1:ut let'sdispeiiw n t l i tlic iibiial ruii of introduction aiid get rightdo\\ ii to J\ ork.W itli tlie exceptioii of olle half of both tlie w i i ~ g ndstabilizer, tlie plaiis sliown on the followirig pages arefull-size aiid coiiiplete. Sinc e botli sides of the w ing aiidthe stabilizer are coiiitriicte(1 in oiie uiiit, it is first iieces-sary to t race the siele of t l ie part sl iown to serve as alayout for tlie otlier side. A s tlle plan is to be used asa jig, it is suggested tliat it be covered with traiisluceiltPaper. pret'erably wax. Tllis will pre\.ent tlie pa rts fromadheriiig to the plari.1lPPEb y W A L T E

FUSELAGETlie fuseiage fraiiie is coiistructed eiitii-eiy of Fun for the beginsq ua re stoc k. T11e sicles ar c first inacle by laying out th efuseiage on the pla n alld iiiaintainiiig tiie iiienibers in a novelty in simp


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THE ZIPPERpermanently in place. The rcar hook is

santled to qhapc after the ii irface hasbeen removed Irom ita jig.Both tlie rudcler antl tlic ,tabilizcrar e attac he d to tlie fii.elage in one uiiit.The atabilizer is riiiiintainetl at zero-degree setting.

not to appltlie \viiigsconipletelyFL


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at tached to the fuselage as shown inSection A-A. I t i s he ld to the shee t bycenient.The whee l s a re cu t f rom 3/32'' sheetstock as indicated on tl ie plan. Bo ththe pants and the lai id ing-gear fai r i i ig.are opt ional . WlNGSTh e ni ng is s imple in construct ion. I tis constriictetl in oiie unit . Th e ribs arecu t f ron i shee t s tock to the fo rn ii l lus trated in Sect ion B-B. Th e t rai l ing

edge is notched to al low for the r ihs a sshown. Th e leading edge is 3/32" Squarestock sliaped to the conto ur of th e rib.Tlie wing is constructed as a straightpa~ie l . I t i s then ben t up \vard f rom thecenter to form a dihedral angle wi th aone-inch rise at the tins. W-1 a n d W-2ar e glued in place. Tliese mem bers givetlie proper angle of incidence.TAlL UNlT'The tai l -uni t construct ion fol lo~vsalong the Same lines as the ming. T h eribs, however, are of 1/16" square s tock.Both the leading and t rai l ing edges ofeach iinit . horizontal arid vertical, are

PROPELLERThe propel ler is carvecl froni n iiie-tliiim-hard balsa b lw k. 1t.q .,liapr is ou t-liiied with a hard peiicil ns sliolvn onPla te 2. The p rope ll e r i s f i r ~ t la iikedto s liape. I t i s then car red . . \ctual ly ,tl iere is l i t t lc that can bc said as to t l ienianne r of carviiig a propeller. Expe ri-encc seems to be the best teacher. Infinishiiig tlie propeller it is of iitm ost

im1)ortance th at i t balance. By in3ert-in g a pi i i at the hub the balance caneasily h r checketl. Ca re shoiilrl he es er -risrcl to iiiaiiit;iiii tlie sh ap e of t lic blatlcsalike. Af ter tlie propeller ha.s brciifinally coriipletecl. it is siiggested tliat itbe given a felv c o a t of I~ an an a i l ant lresandetl to a sinootli siirface.COVERING

The roniplete inodel is covered nitl isuperfirie ti.,sue. Tlie n ng is ro\~crcdon one side oiily. aq are the stabilizerand rudder. Th e paper i y t lopeepro per locslioul(1 br t l ie model be iieccssagliding. Esettings ofbeat flightsWith theler slioiildantl laiincl


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AT iWE RY/% sE2B LEVEL OFFSTART F R S ~ R m KW E 0 MPA'7R4

PIPER''PLANEQUIZ ''


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SELECTING YOUR GAS ENGIOn, wl i i le on the Wasp they are brazedOn. Since nothing h as been lieard fromthe Madewel l Co. , of late , i t i s safe to

engine is a lapped job having a steelcylinder and piston afid an entirely origi-na l b reaker -min t svs t em. The crank-, inclosed anovel feat


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assume tha t t he Wasp i s rep lac ing i t .Th e W asp a l so comes in k i t fo rm fo r$12.95, and ' i s t he f i r s t k i t ac tua l ly ont l ie niarket in the smal l -engine class . I ti s exceedingly s imple to assemble andcomes al ready lapped.

Troian. Th e Tro jan has a ro ll er c rank-sha ft bearing. B y an exclusive processa n absolute ly leak-proof seal is obtaine da t t h e cr a nk c a se . I t no w comes withtwin exhaust s tacks cas t in to the cvl in-der and ,an inclosed t imer.CLASS B ENGINES

Models for Class B engines are moreplenti ful. Th ere are an y number of ki tsoii the mar ket which would perform v erysat is factorily wi th an y one of the B en-gines. Th ese models, being slightlylarger, s turdier , an d heavier t l ian Class Amodels, could be built with less skill,and since some of them could be a triflesnial ler than Class C models , manybui lders s t ress them to take ei ther aC or B eng ine . Or by bu i ld ing them a tt l ie bot tom of the scale. thev can beniade t o perfo rm U-itl i a Class A engine,providing they are light enougli. Of tl iesmal l ships , Class B m odels are a t pres-en t more popu lar than A model s. Th i si s due to the fac t t ha t t he pone r p l an t sin th is class are only a trifle l ieavier thanClass A power plants , but develop agreat deal more power. Tl ie ignit ionsyatem is th e biggcst hand icap in th isins tance inasmuch as t l ie neight ofthe coil , condei iser , p lug and bat teries ispractically tl ie Same for all cngincs.Tlie R , t herefo re , has a n adv an tage ovcrthe A. Should a satisfacto ry coil bcplaced on the niarkct wliicli will-operatcon 11/i vol ts. it xvill he a real boo n t omodel builders by makiiig pohsible theiise of only oiie ba tte ry . Bc tter sti l l ,if it would be possible t o produce aDiesel cngine ii i miniatuie, i t would do

case is sand-cast . Th e needle valve isnot of t he convent ional micrometer type.Instead, i t makes use of a baffle-typeneedle.

Hi-Speed. The Hi-Speed was designedby Bill Atwood, and is a rotary-valvetype; that is, i t receives its fuel bygrav i ty feed . The n iix ture i s t hen d ra ~v nthrough a l iollo~v ranksliaft ~vliiclia c t sa s a valve. Th is typ e of eiigine will ru nonly in one direction, and sinee it isgravi ty fed, i t i s not recommended thatthe engine be inverted because of t hetendency to f lwd the c rankcase whenthe motor s tops . A special invertedmodel is nom available for $13 .25 . T h ecrankcase and cyl inder supports are in-tegral ly cas t of Dow metal . Dow meta lis an exceptionally strong super-light al-loy. T he plug of this engine is offset,mliicli goes for better firing and follolvsa pract ice adopted in racing engines .I t s need le va l re i s on a s ide be lon theshaft bearing. and extreme caut ion mustbe used in flippiiig the propeller t o pre-vent snapping off the needle valve."23." The Ohlsson "$23" Iias becnconsidered by m any as th e f inest b i t ofengineering in the model-engine field.Th is engine is ruggedly constructed, hav-ing a 1/4" crankshaft wi th a bal l -bearing

thru st bearing. T he beariiig surfacc oft l ie shaft and shaft bearing are tapered.Thc p rop pu l l ing th rough the a i r t endsto sea t t he s l ia f t . As the shaf t nears ,the p rop ma y be t ightencd on, t l ierebypul ling the shaft forward and pro\ idin ga perfect seal a s the beariiigs ivear. Tlieintake and by-pass manifold are cas t inan integral unit nith the rear .;ectioii oftl ie crank case. Tlie steel cylii ider is thenforced into the Cast ing and spot-neldedt o this u nit , being sealetl a t t l ie jointn i th a gaskc t .

New Bantam. A new Bai i tani whichwil l hc ki ion n a s the Bai i tai i i R wiH swii

COur firsused in C ships to beplenti ful. from sprustressed foa s ize to pt ion. Strod o not affForster B

t l ie oldestengine busfeatures onmiriuni alcrankuhaftaluminum ception ofsteel, and ma de of sgas t ank pthe tank ist ing. Tl iepower atThese engfi f teen poudcsirable control lcd fa ctu re theexcelleiit rThis eiigitimer and rat io t l ianf o r le ss f o uter Bros . emodels. Tand avai laing or radibear ing a tfo r $19 .50ineh bore able ei thera 14.5 C Cmen t . Robearing crcooled in c

equipped plant. Practically all - of theparts that go into the Brown Jr., motorsare manufactured in their own factory,and even the $10 D models are test-run.All Brown engines have a remarkableweight-power ratio and have a well-established reputation for reliability.

cvlinder- "num sleeve shrunk On. The piston ishardened and gound steel and precisionlapped. The crankshaf t is drop forged,hardened and ground of high-cprbonsteel.

Dennymite Engine. The Dennymite en-

E XNEW B


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They are available in four models. TheB, at $21.50, is a lapped job having asteel cylinder and piston individually fit-ted, micrometer needle valve and chokenut, and the Number 1 type coil. I t isalso cadmium-plated to prevent rusting.The C model comes mounted, ready to.run on a test block, a t $17, and has theSame specifications as the B, except thatit has an aluminum-alloy piston withtwo cast-iron piston rings and a baffletype of needle valve. I t , like the B,comes with a Number 1 tyl j, coil. Themodel D, at $10, was one of the finestlow-priced engines in the field. Like theC, it had an aluminum-alloy piston withtwo cast-iron rings a nd baffle-type needlevalve. I t , however, did not come cad-mium plated, and was not mounted on a .test block. A Number 2 type coil wasincluded with this unit. The crankshaftwas made of "Z" metal and has beenfound not to stand up as well as thechrome molybdenum crankshafts whichare used on the B and C models. TheM model is the Same as the D, exceptthat it has a micrometer needle valveand a choke nut and comes cadmiumplated with a flywheel.

The Brown motors all use a twepiecespark plug of their own manufacture,and a two-piece gas tank with a filter.At present the Brown models are under-going a change in design. The newengines will come through with an im-proved type swipe timer which is ex-tremely simple and foolproof, and a newtransparent gas tank. This timer hasits points above the shaft, which goesfor cleaner operation and less foulingcaused by leakage of oil at the shaft.,411 models will have micrometer needlevalves, and the shafts in the lower-pricedmodels ai ll be made of chrome molyb-denum. Th e new D model will cost$12.50, the C $18.50, the M $16.50. TheB remains a t $21.50. The new timers

gine is available in three models. I n theDe Lux Air Stream the cylinder i's ofmolybdenum iron and is streamlined,presenting a greater surface to the air,which allows for better cooling. The pis-ton is made of the Same metal lappedto fit. The crankcase is made of a spe-cial aluminum alloy and has an ex-tremely large bearing. The timer is fullyguaranteed and you can get a free re-placement if yours ever fails. The car-buretor has a spring choke which is use-ful should the engine be cowled. TheDe Lux model has an extra long "down-drafty'exhaust stack and comes mountedon dural motor mounts. The StandardAir Stream comes with a regular exhauststack and mounts. but without thespring choke. Specifications are the Sameas the De Lux. The Denny Special hasthe old round cylinder head and comeswitliout the streamlined outside exhauststack and spring choke, but with duralmounts.

Gwin Aero. The Gwin Aero is one ofa line of engines produced by the BunchModel Airplane Company. The Gwinhas a steel cylinder and comes with apermanently fixed exhaust manifold.The manifold seems to be the only a pparent differesce between the Gwin andthe Mighty Midget line. Both kits andengines are available in awmbled form,upright and inverted, and in kit form,upright or inverted. There is also theMighty Marine engine, which is .likethe Mighty Midget with a better bear-ing, and comes with a flywheel. A newaddition to the line is the Speedway en-.&ne. which is like the Gwin Aero. andU ,comes with a special flywheel. This en-gine is made especially for model racecars, which are rapidly gajning favorwith model builders. All Bunch enginescome with aluminum high-domed pis-tons and two rings. These engines inkit form have brought gas.engines within

DIAMSETS

SCREEDMOto be a new rnodel airplaMarch 19, wlyn, N. Y.,Demon to fievent at a copolitan Modernond Dernonon three flighflight flew ouand 12 seconrun. The recoNational Aerfication.The DiarnoOhlsson 23 , wand the rneeplane has beSpan of 48 i

cornplete, readfor a contes;ist ships ornuch cornrneconstruction.Other Bay with rnarked showroorn mowhich was buposes, took seevent, averaglongest flightutes. Bay Rninth in the CMore thans m e 125 entr

CONBay R idge D iamond Demever , we knoSure you'l l waca l i t y to ow nThe Diamonord breaker alow color iobbuilder . Co mbut lesc motoC.O.D. orderc


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able , or ins ta l l t l ie engine . gas tank,

canopy n i t l i ce l lu lo id , g lu ing h lackp a p e r s t r i p s a l o n g t h e e d g e s a n djoiiits.Begiri wing co~is t ruc t ion by s l id ingr ibs in to not rhes on n la in spa r .Notch in the t r a i l ing edge. l ine u pwitli yuur eye Irr pin to tab le to p witli


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culation is very necessary to a high-speed raeer . Cu t the b locks to s ic leand top v iew; use a templa te for thec i reular f ron t , and t l ie shap e of t t ief irewall for the rear template. Leav ethe h lock f la t a t the poin t where thef r o n t c w l i n g a p e r t u r e i s t o b e c u t .Thiv does not look streanilined whileea rving , but lw ks swe l l when f in ished.g i v in g a p e r f e c t l ~ o n t o u r e ~ l i d e v ie ww i t h o u l t h e c u p p i n g a p p e a r a n c e o f t e n

Hol low out wi th a cup& chise l orc a r v i n g t w l . Ma k e c u t - o u t s f o rt imer a rm an d dra in . a i id te s t - f i t ove rengine. San d srnooth. dope, installp g s t o a t t a c h i i p pe r h a lf . a n d g l ii ed r e s ~ n a p s i n pl ac e . T h e s e l a t t e ra re bes t ipcured by rougli ing the sur -f a r ~l ight ly , eove r ing wi th one eoa tof g lue , leaving unt i l f s i r ly d ry , andthen g lu ing in p lace wi th a gene rons

B u lt t h e en g i n e w l i dl y t o t h em o u n t s . Solde r up a r ec tangula r gast a n k ( t o i n c re a s e c a p a e i t y ) , ine lud-ing soine simple I, mount ing brack-r t s , a n < l l u l t t o B u l k h e a d s N o . 1 a n dN o . Z. Use a i i o i lprwf rubbe r in taketube bent to the r ight ins ide of thetank . Lulder in p lace the leads tot h e g r o u n d a n d b r e a k e r p i n t s .Carv e aiid install the lower tailb lock . Th e uppe r ta il b lock is madein three p iems. the cente r 3/1< Ra tpiece whieb is a lso the f in . and thetwo I> lockr on ea rh s ide which a r era rved to f i l l r t the t in in to t he f i rse -lage. Cu t the rudd e r loose. hingewith shee t me ta l . and g lue the wholejo in t sol id aga in . Adjus t by bendingan11 breat hing on joint. Streamliiiet h e upper h e f o re g l u in g i n t o p s i -

tm ori tlie fuselage. Ik av e the baserec tangula r where i t f i t s be tween thetw o s ide b locks . Ca rvr out noteh inrudde r to c lear e leva tor s t r ip . Whent h e s e t h r e e p i m s a r e g l u ed s e cu r el ya n d d r y , c a r e f u l l y c a r v e t o s h a p e ,sand s rnooth . and c lea rdope to a f in-

tlie asaistance o f small ba1.w blocks(jig blm-ks) . Gliie on the leaclirigesliape, not coming near the f inal ili-inensions. Drill a hole ir i the end,a t tac l i to a motor s ha f t wi th g lue ,a i id leave to dry thoroiighly . Tu rno n t h e m o t o r , b r i n g t o s h a p e w i t h ar liix-I, k iiife , and san dpap er. Remov ef rom sha f t an i l ca rve out ins ide to f i ta Tige r F i reba l l prope l le r , n i i t , an


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SCALE FOR THE FELLOWS W H 0 LlKE SPEED PLUS REALISM

ATHEK 'rouiid, you scale coiitrol-liiie faiis! You slweti tmystake heed, too, becaiise here is a little replica that will tleliglitboth. Tlie Grumman F8F- 1 "Bearcat" is as neat a little fighteras has ever cleaved the old ozone. Had the war continiied aiiotlierfew nionths, even weeks, impressive Scores would uridoiihtedly havek n halked up by tliis agile, hard-hittiiig iighter.Although not niuch inforniation has Ixeii released oii this aircraft,it is known that it has an engine with greater horsepower than thatof its oIder brother, the Hellcat (pli is a foiir-hlatled Aero prol)),yet has a sinaller spaii than the faniecl Wilclcat ! lts cliiiib rivalsthat of the Navy's spectacular jet Fighter, the Ryaii Fireba ll, and tlieFireball has tlie advaiitage of both jet and cdnveiitiorial engines.Th e maneuverabil ity of the niodel is a sor t of scaled-dowii versionof the real aircraft, as it is both fast and easily coiitrolled.

Fuselage: Tac k eiilarged plans of the Uearcat to a siiiooth,, flatsurface, placing waxed paper over tliem for protection froiii theglue. Cut keels: one top, oiie bottoni, and fo ur sides froni :j/l,"mediuni sheet ba l d and place top aiicl hottom in correct ~msitiorioverplans. Lay two pieces of . ? / i o W sqiiare stock along thiiis t liiie oiiplaris also, these fon iiing a base for hatch divisioii. Kote thattop 3 / 16" Square piece goes only as far as fornier 6a . Now plaeeformers. wliich have beeii carefullv iiit froiii niecliuiii sheet,.-in correct places, usiiig a good gratl e of iiiwlel ceiiieiit iii tlie joirits.Be certaiii that top an{,2" slieet. Slmr is ciit froni Iiar


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T E Short Empire flying boat, designed for ImperialAirways' far-flung routes to the East and for tlietransatlantic service, is a giant as airplanes go.The Span of the four-motored monoplane is 114 ft.,

and the length is 88 ft. 6 in. The heiglit froni the wa-ter line when afloat is 24 ft. Construction is of meta1throughout. Fo r day service, 24'passengers are carried.As a sleeper, 16 passengers will be carried. The Crewnumbers five.

The four Pegasus 740 h.p. engines are expected toyield a top speed of approximately 200 m.p.h., and acruising speed of 150-160 m.p.h. The wing flaps are ofgenerous area and permit a reasonable landing speed.

Ou r %'' scale model is of the Caledonia, the secondEmpire boat of a series of twenty-nine to be constructed.It differs from the Canopzts, the first to be completed,in that the Canopzfs is to be placed on the Mediterraneanliop in the India service, while tlie Caledonia is said tobe intended for Atlantic flights. Incidentally, the princi-pal difference between these two boats that is evidentto the eye is in the number of windows. Since theweight of the Caledonia is 5,000 lbs. more than that of the

OceAir-Li

place. Provide small holes to tathe dowels and force each wingplenty of ceinent. The fillets are m

Carve the wing tip floats to balsa. After sanding theiii carstreamlined or rounded bamboo bracing threads until the paintin

The four propellers are cut mounted on pins so that they athat they are all left liand, in acc

~ag i o pu s nd as most of the windowshave been omitted on the Cnledonia,it is probable that interior arrange-ments are designed for larger fuel ca-pacity on the ocean-hopping ship.

To start construction, trim a soft block down to therequired outside hull dimensions. Draw the side profile

engine customGive the m

of clear varnitween eacli coFinish' the shi

triin and letters black. Put the tthe tip floats and construct the b


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RUMPLER "TAUBE"the correct wing alignment. Engine mounting boltsare cemented firmly behind the firewall beforeinstalling it.

Dummy radiators add a bit of scale realism.However, the left one may be omitted if it inte r-

wing to dry thoroughly. Tbe mounted parallel to thwing is blocked to correfirmly and later check to friction fit in the fuselage


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feres with timer or fuel shut-off installations. Atimer cut-off can be installed in the front cockpit.Turtledeck sheeting is fitted and applied-the edgebetween the 1/16 inch sides and the 1/32 inch deck-ing being sanded away.

Since some Half-A engines do not prime readilydue to weak crankcase vacuum, th e original modelemployed a gravity tank made to replace the reardummy cylinders. Other tank installations aresuitable. The simple aluminum exhaust shield'orbaffle is recommended to reduce the'fire hazardand to keep the ,nose section clear of excess oil.

Thrust line can be raised if necessary in al teringformer "A" for installation of other engines, andthe height of the dummy cylinders can be changedto match tha t of the engine's cylinder.As modified from tru e scale, the wings ar e simpleand efficient for model use. The curved, laminatedleading edge is the only unusual aspect, and is an-other construction feature used widely in England.The strips a re thoroughly water-soaked and, be-ginning with the inner one which is bent againsta row of pins (working over the wing plan) , thesucceeding strips ar e pinned and liberally cement-ed to the proper outline. When dry the curvatureis retained. Continue wing assembly with trailingedges, tip parts and ribs. Since the spar stripscurve and pass the ribs at an angle, it is best tocut the notches in the outer ribs, as the spars (alsowater-soaked) are fitted.

Raise wing frame from the work board to addlower spars, then cut edges and spars as necessaryto add polyhedral. Block to position and permit

edges, .taper trailing edgeLaminated edges are formed in Same manner asBuild the spars and ribs edges and trailing edge atwo after they have dried. and Sand the structure pre

Build the rudder of meddirections, and the small dis attached by bindihg and

For once, dispense with and dig yp a pair of old-styrealism. The gear struts aand cemented to the fuselato axle. Simulate spokes by

Ja p tissue is the coverinrecommend Butyrate dopenary clear dope but whicresistant. It is available inbe tinted or colored withOur Taube wings. were Maltese crosses, the fuselagcolor. If you use Silkspandope to avoid brittleness.

Balance the model neartongue. Add clay in noseC. G. location. Make hatrim, adjusting stabilizer Firs t power flights should brich Setting. The Taube cleft, although the originaleft in tight spirals and glcles. Slight downthrust w


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4 Classic Flying Models

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Transcript of 4 Classic Flying Models