6 classic flying models

7/27/2019 6 Classic Flying Models

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I60 PAGES CF FUlHG NOSTALGIAMO


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T H E PAYOFF I S IN T H E PAYLOAD!

P M oad Clarr V*, Payload events, first sponsored by Pan AmericanOpen division winner: World Airways in 1948, have become an outstandingFrank E h h g free flight competition at numerous local andJersey City, New Jersey. 1531.4 regional meets-and a highlight of the Nationals.These exciting contests provide model flying

that brings out the basic purpose of aviationitself- to carry a load.

PAA Loa d Clarr AB, PAA Load Events, responsible for many newJunior-Senior division winner: designs and flying techniques, offer trophies andMichael Cook cash prizes to the winners. Here's where sheerGranville. Ohio. 35 6. 6 inventiveness is the mark of a champion.You could be a champion in ' 52 . . .why not

get started on your job today?PAA Load Class AB, For rules and specifications for 1952 PAA LoadOpen division winner: Events, write to: Educational Director, 28-19Herbert Kothe Bridge Plaza North, Long Island City 1, New York.Grand Praifie, Texas. 15:19.0 s ~ e . m u L . U. s. ~ m t . E.

PAA CUPPER* CARGO,A ge classwmbined winner:PmAMmmW O R L D ' S M O S T E X P E R I E N C E D A l R L l N ELa Mott RandolphD W , Texas. 0:40.4-1% o z .


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AIRTRAILSW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .OLUME 3INUMBER 1 STILL 'S SL lCK STUNT STUK A/S t i I I 4SPRING11979 Neat semi-scale control line stunter. AT April 1952MOD EL BUILDERS ARE INVENTORS TOO !/Rushe r . . . . . . . . . . . . . . . . . . 8Unusual modeling ideas from AT April 1952

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ED SCHNEPF Publisher CURTISS HELLDIVER/Thomas 10MICHAEL O,LEARY . xecut ive Edi tor Solid scale Navy dive bomber. AT July 1946. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~ C H A R D ~ L L E R .Managing ~d i to r P-38 LIGHTNING/Thomas 12SEAN GREENWAY . ~ ~ ~ ~ i ~ t ~ditor Simple Profile balsa rubber fberTEXACO TROPHY WINNER/Hanley . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14BOB RATNER Production Directo r Dutstanding gas free flig ht plans. AT July 1938RICHARD X. LANG Executive Art Directo r STOUT TROPHY WINNER/Stoner & Stapi lus . . . . . . . . . . . . . . . . . . . . . . . 20RICHARD GEHRUNG Graphics Directo r Beautiful trophy winner rubber i ob from AT Jury 1938

SVEN CARLSON Circula tion Directo r NORTH AMERICAN XO-47/Dick inson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25JIM BUCHANAN Circula tion Services scaie drawings from AT J U I ~ 93 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .AN WHEDON Director BOWLUS BABY ALBATROSS/P lecan 26JANET GRAHAM Service Classic glider scale ptans from AT July 1938KNIGHT TWISTER/Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Solid scale homebuilt model from AT July 1938SKYLARK/Garma i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4PATRICK H. POTEGA Class B contest free (light. AT September 1940Advertising Director AIR-MODEL MA NUAL/S ta f f . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87950 Deering Avenue Useful modeling hints from AT 1952 Model AnnualCanoga Park, California 91304 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .(213) 887-0550 LOCAI ' ING THERMALS/MacCready 46Sniffing out thermals from AT 1952 Model AnnualKAREN R. LAMONTIA POWER DEPARTMEIVT/Staff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47Advertising Coordinator Engine details from AT 1952 Model AnnualTHE MYSTERY MAN/Weathers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54Part Two from AT July 1939CONSOI-IDATED PB2A/Staff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59Scale 1930s military pursuit. AT January 1939AERONCA CHAMPION/Noonan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60Scale rubber light plane. AT August 1946SHOESTRING/Smi th . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62Famous scale gas racer. AT September 1952 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .REClSlON AEROBATICS/Staf f 66Conlrol line stunt flying. AT September 1952FOKKER'S LATEST/Dick inson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68Pre-war Dutch fighter from March 1939 ATREARWIN SPEEDSTER/Thomas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70Scale rubber light plane from AT July 1940SPITFIRE/Dick inson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73Scale drawing from July 1940K.C. CUTIE/Mi l le r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74Free flight gas biplane from January 1952 AT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ERCATOR/Lashek & Smi th 78Odd-ball Navy bomber. AT March 1954CURTISS A3B FALCON/Musciano . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82Scale gas biplane from AT July 1952 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .EAL GONE GUYS/Staf f 85

I t should be noted thal all adveriisements in English model designs from AT July 1952. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .lRRAllSLAsSICLYINGODELS are CAN NY CANARD/Thomas 86vlntage eds and not current adveriisements forgoodi or ienlcas. Pusher rubber sport model. AT March 1945. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .REAT LAKES/Guarn ier i 88Rubber scale biplane. AT July 1946 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ROSS BOW LAUNCHER/Eh l ing 90Homemade glider launcher. AT January 1942. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .UICKIE/Sprauge 92Sport rubber free flight cabin. AT November 1941. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .LOHA/Jex 96C02 powered free flight. AT July 1949

AIR TRAILS CLASSIC FLYlNG MODELS is published quarterly bY Challenge Publ icati ons, Inc. , 7950 Deering Avenue, Canoga Park, California 91304.Copyright 0 1 9 7 9 by Challenge Publications, Inc. All rights reserved On enti re contents, nothing rnay be reprinted in whoie or in part without writte nperrnission from the publisher. Publisher assurnes no resp onsibility for un solic ited material. All photos, manuscripts and artwork rnust be accornpaniedby stamped self-add ressed return envelope. Subsc ripti on orde rs and changes of address should be sent t o AIR TRAILS CLASSIC FLYiNG MODELS,


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STILL'SSTUNT"STUKA" ELEVATOR 6. STABIUZER 112"SHEET SHAPED T0 SYM-

I8"SHEET SIDES

NG FLAP-SEE SCALE PLANSVECO CONTROL HORN

TI E CAP 3TWP

BENT TIN SHEET

PLYWOOD PUSH ROD GUI

PRESS-TIME TELEGRAM FRO M D O N STILL:"Stuka Wins First Senior Stunt Tangerine Internationals I18"SHEET ROOT RIBSa t Orlando, Fla." The big wintertime meet is the largest 1/18" SHEET STIFFENERoff-season even t o f its kind in the w orld. Con grats , Don!

1A" PLY WOOD BEL LCRANK RATFORM

I/B" MA.WIREV G SRUT\

cMSl!!/ONSTANT 2"i CHORDFROM ROOT T0 "A"

1132" SHEET FAlRlNGCEMENTED TOGEiHER

2 PCS. IR-SHEETHOLLOWED OUT T 0

CLEAR WHEEL


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semi-box fuselage, I chanced on the Because this ship is designed for Cover with Silkspan and dope, addGerman Junk ers Ju . 87B Stuka the more experienced model builder, horn and join with metal hinges.which filled the bill. conventional construction advice Fuselage construction is starte dSom e noticeable changes were will be omitted. Attention will be arou nd tank. Reinforceme nts ofmade, namely the inverted gull placed on unusual details. Construc- 1/16'' plywood ar e added to th e %"wing became a straig ht wing with tion was begup on the wing. It is of sheet sides. Par tic ula r atten tiona wider chord. Otherwise the cowl, the popular "D" tube type. However, must be dra wn to motor mounts.landing gear, tail surfaces, and fuse- it was found construction time is cut They a re installed at a slight anglelage remained approximate scale. considerably, with no strength sacri- to correspond with the a ngul ar set-This ship was awarded the high- fice, by using two 3/16" squa re main ting of th e wing and stabilizer, thu sest appearance points at the '51 Nats spars instead of the 1/16" sheet spar. putti ng the stabilizer out of the wingand took second place in the Senior Wing alignmeirt is also easier.. turbulence. The two sides are glueddivision. Instead of the leading and trailing over firelyall and landing gear bulk-The Stuka was designed for me- edge sheeting joining at the wing's heads, with tank in place. Holes aredium-sized maneuvers and cannot center, a full-length 36"x2MVx1/16" drille d for ins tal lin g landing gearbe m ade to do tight, un-u nifor m sheet is used with a shorted 2$5"x befo re bulkhead is glued in. Land ingflip-flops (a fa ult with most flap 1/16'' shee t planking the rema inde r gear is added later , before top andshi ps) . Weight should be kept of the wing's length. Top and bottom bottom plan king. Now glue fuse-around two pounds, my ship weigh- full-length sheets are alternated, as lage tail together and add bulk-ing 30 Ounces. ar e leading and trailing edge sheets. heads, giving the fuselage a "V"

This arrangement distributes your shape toward the tail.weak joints evenly and toward the When the stabilizer is next gluedtip s of t he wing. on top of t he fuselage sides, it mustThe flap is two 1/16,' sheets with -be blocked up %" at leading edge tocente r holes cut out for lightness; have Zero incidence. Th e top isGlue the leading edges over a 34'' planked after wing is installed andsqu are spar, the n pul1 together and controls hooked up. Note whichglue at trailing edge over y8" sheet holes in bellcrank and horn are used.ribs. "U" shaped metal hinges join From the stabilizer to the cockpit athe flap to the wing. The entire solid block of M" sheet is used,wing and flaps ar e covered wet with rounded on top and hollowed out.heavy Silkspan and doped 6 to 8 The rema inde r of the top is plankedcoats with medium-thin ned dope with 3/32"xM" Strips. Th e bottombefore installing in fuselage. Flaps sheeting is glued within the tw oare hinged permanently af ter wing sides up to the landing gear. Fromis installed. there forward, a M" sheet block isA 36"xMWx2M" sheet cut in two used. It is rounded aff toward theforms the stabilizer and elevator. firewall and hollowed.Carve and Sand to symmetrical air- Build the rudder as a unit, usingglued together over %" ribs. Coverand dope.

" X If2"PLANKlN6

APLE ENCINC MOUNTS

.015 WlRE LEAD OUT LlNE SSPAN COM RING

V#" PLYWOODRE IW. PIECE FROOM SPINNER

LCWER COWL

FOX 2 9 ENlNESPECIFIED(0FF-SE T T03DE6REESOUT-THRUST)


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INVENTORS, Too!The inqenuity of the aeromodeler is evident from great numberof patents which have been issued to him by U. 5. Patent OfficeBy RAY RUSHER

Out of the many ~ n i t e d tates patents that were issued during theth e past few years, well over 100 have had to do with model airplanes,race car s an d engines, and with a v ariety of accessories foi. th e modelbuilde r. Possibly on e of those gadgets you have worke d out foi' yourmodel plane is an invention. If so, a patent can be issued to you. In-ventor s need not be "of age"; if you have really inven ted soniething,you are entitled to a patent.If the Pat ent Office considers any device you have worked out a s beingan invention, it will gra nt you a patent, t he life of which is sevcnteenyears an d conveys the exclusive r ight to rnake, use and sell the inventionclairned in the patent. Full inforrnation about the procedure can bc ha dby add ressing th e Cornmissioner of P aten ts, Washington 25, D.C.

The main prerequisite to securing a patent is the pi'eparation an dfiling of a pa ten t application. An applicat'ion consists of d iaw ings anda description of th e invention tog ether wit h "clairns" you ma ke foi' it.

Fig. I. One of C arl Goldberg'r engine accessorier conrirted o f an engine mounting toprevent broken props. Engine bearers 27 are pivoted at 29 to mounting brackets 26 andare held againrt stopr 3 3 by springs 30. Most oll pate nt drawingr look wild 'n' weird.Fig. 2. Daman L. McCoy made sevecal improvements on the conventional 2-cycle engine toincrease efic iency . Amo ng other features. the shaper o f tranrfer ports 58 . baffle 63 on thepiston and cylinder head 16 were improved, and the spa rt plug was set a t an angle.Fig. 3. Charles Brebeck pat ent ed stepped piston to reduce mixing fresh gar with erhaustgar. Fresh gar coming in through ports 9 hits step and is deflected upwardly in to cylinderwhile exhaust gar is expelled through p arts 6 in oppori te side. H o runs "O K" motor works.Fig. 4. Randall E. Froom holdr pat ent r on pr op Spinners. This one solves the p rob lem ofmounting spinner back plate 3. the p rop hub 2 and spinner I I on crankshoft I. Rod 6 rcrewsinta nut 5 for the back plat e and prop. Hea d 16 on rod holds the rpinner in porition.Fig. 5. T. R. (R ay ) Arde n holds many inventions in the.model field. This is the Ato m enginewith adj ustab le fuel supply. Ard en also received patent r for an adjustable compressionrat io in the old Atom powerplant. A lever was ured to raire or lower the cylinder head.Fig. 6. Thir ir it! Paten t #2,292,416 dat ed Aug. I I, 1942-"controlled capti ve typ e toyairplane." Jim Walker filed for this in December, 1940. Not e th at he also covered theengine control. Authorities consider this the greotest patent in modelplane field.Fig. 7. W e oll know th at the mai ority o f modelplane engines now ure a glow p lug rath erthan spart ignitian. We ll. here's the beginning of t hat trend: Kenneth Howie filed anappl icati on for glow plug ignition in 1937 and received hir patent the following year.Fig. 8. Here ir the unique "control for model airplaner" ar patented by Victor Stanzelan d known back then in '39 ar "G-line" flying. On e line utilized. Mr. Stanzel also hold rother patentr on model plane itemr ar do many of the other inventor-modelerr mentioned.F ( ~ . . Kenneth A. Wil lard 's invention for the control of the model elevator was a r ubbe rban d 24 for "down" and a control wire 26 Tor "up" which Parser thro ugh ey elet 28 t ohandle fram which recond line is permanently anchored at wing ti p a t 27. Tail pivotr.

Fig. 10. Most Users of spart plug ignition are familiar with the ignition timer patented byWal ter C. Austin and Webstar Hill. Operates by air compressed by a spring so travel ofpiston is slowed depending on rapidity with which air ir let out of cylinder by the valve.


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TEXACO TROPHYWINNERFive pages of detailed plam and information for dupli-cating the most renowned gas model of the 1937-8 contesty ear-the 25th Air Trails championship model presentation.

By Fiske Hanle 11, c o l l a b o r a t i o n w i t hGordon S. L i g h t

T E T E X A C O T R O P H Y is t he o uts tan din gaward for gas models . Al l Texaco winners havebeen ou tstan ding models. Han ley's 1937 winnercontinu es this fam ous l ine of models. I t incorpora testhe fea tures which Hanley deemed necessary for a con-test winner-fast climb, slow glide, an d stable flight.T h e model l ived up to a l l these requi rements despi te thefact that it was designed, built and test-flown two weeksbefore the National Meet .I t ' s a l ong way f rom For t Wor t h t o De t ro i t and t h i saccounts for the a t tent ion Hanley pa id to making hismodel demountable for ease in carrying. Th e wing i stwo-piece, the landing gear is detachable, tai l removable,and the motor mount i s readi ly de tached.

CONS'TRUCTIONI t is difficult to include every constru ction detail inthis l imited space. Therefore the routine type of con-

struction will be passed over lightly and the Specialemphasis given to the features 'which n-iake this modeldist inct ive. All the dcawings have been dra w n to thescale indicated and measurements can be made direct lyfrom the Sketches.

Cfood P y ing t e rra in and e qua l l y good P y ing w ea t her ar ef a s t n i a k i n g g a s n io d e li n g a f a v o r i te o u t d o o r s p o r t i nI l' eX 8 , r e c e n t t h o u g h t h ia i n t e r e e t i s i n t h a t s t a t e . . F i s k eH a n l e y w a s o n e o f t h e p r st t o t a k e u p g as m o d e l in g t nT e x a s - t k a t w a s a l it t l e m o r e t h a n a V e a r a g o . H e h a dample mode l ing background fo r h i s gas mode l ac t i v i t t ea .R e s tar t ed bu i ld ing th e "eo lid" var i e t y whe-n Ii e w as j u sto ld enoug h to s ta r t sc l ioo l. Dur ing the l ae t f our veareh e ' s b e e n d o i n g g oo d w o r k w i t h P y i n g m o d e l s .L a s t J u l y i n D e t r o i t , H a n l e y e a rn ed a c h a m p i o n s h ipr a t i n g by w i n n i n t h e T e z a c o T r o p h v f or g a s -p o w er e dm o d e l s . H e m a t c i e d a m o d e l o h re o w n d e s i g n a n d c on -s t r u c t i o n a g a i ns t t h e b ea t i n - t i e c o u n t r y . H i s w i n n i n gf l i g l ~ t f 50 m i n u t e s a n d 2 9 s e c o n d s w a s w e l l o u t i n f r o n t .( H i a m od e l l a nd e d i n t h e D e t r o i t R i v e r o n t h e C a n a d i a ns r de .) T l i e l o ng t r i p f r o m F o r t W w t h t o D e t r o it h a d n' tdimnaed t l ie Pying bri l l innce of hin design.A b o u t a year ago , I Inn l ey ' s P re t gae n iode l wo n thea l l -T e x a e m e e t . T h e p r iz e w a s a B r o w n m o t o r . I t w a sw i t h t h i s m o t o r t h a t h e l n t e r w o n t h e T e x ac o T r o p h ? ~ .l i a n le l / i s a m e m b e r o f t h e F o r t W o r t h G a 8 M o d e l C l u ba n d h a e pl uc ed w e l l u p i n t h e r c g u l a r m o n t h l v c o n t e s t s .T l i e c l u b h a e t h e e n v i a b l e r e c or d o f h a v i n g a m e m b e rt a k e fi r st i n e v e r v c o n t e s t t h e c l u b h a e e n t e r e d . A eH a n l e v p u t e i t . " l V e d o n 't u e e b ig w o r d s f o r o u r m o d e laerodvnamice , b u t w e e u r e d o g e t t c eu l ts . "A t p r e s e n t H a n l e v 4 s p n i s h in g u p h i s h i g h s c h o o lcoureee and p lann on tak in g aeronau t i ca l eng ineer ing a tt h e N o r t h T e x a s A g r i c u l t u r a l C o l l eg e .w - T e z a n s h a v e c o n e a l o n g zu ayO t h e r m o d o l e r s w i l l d o w e l l t o

FUSELAGETh e bas ic . fuse lage s t ruc ture i s buil t f rom @ X& " balsain conventional fashion. T h e two s ide panels a re buil tdirectly over a full-size layou t of th e fuselage and th enjoined by the top and bottom cross-braces. Fo rm ersand s t r i nge rs a re added t o t he t op and b o t t on ~of thisbasic structure.T h e foriners ar e cut froin two-ply balsa. Atypical former-top an d bottonl-is sho wn in th e pat-tern of ful l-size parts. T he other forme rs will have tobe changed sliglitly to fit their particular location.% I f spruce stringers are used both top and bottoin.Tw o f ron t fuse lage formersare cut f rom % I 1 three-plyhardwood . O ne of theseformers is at tached rigidly tothe front of the fuselage.The other former i s used to

inake up the motor mount .Cut t wo mot or bea re r s (pa t -tern shown ful l-size) froin%" plywood. These bearersare nai led and cemented tothe former. Sp ruce pieces-g x g x 4 " - a r e c em e nt ed t othe inside of these plywoodmotor bearers.The mot or mount i s a t -tached to the fuselage byr u b b e r - a n d - h o o k s o n e a c hsid e of th e fuselage. T h e i n-side surface of the motormount is l ined withSquare balsa which fi ts inside


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S E E DETAIL DRAWIP IG OF V OTOR KCXJYT-

F R O N T V I E W - W I N G MOUNT

K A L E IN INCHES

0 I 2 3 4 5 6 7 B C 1 0 1 1 l 2


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the opening cut in the front fuselage foriner and helpsliold tlie motor mount in position.Batteries ar e replaced inside the fro nt of tlie fuselageby takin g off tlie motor mo unt. Clips are cemented totlie iiiotor mount to facilitate takiiig off tlie iiiotor.L A N D I N G G E A RThe landing gear is dei i iountable . Tlie f /s" diameterwire struts fit into extra-tliick aluiiiinum tubing wliicliis ceinented and wrapped to tlie bottom of tlie ?/8xgtf

longeroiis. A "V " strut of .055 wire joins tlie twolialves of tlie landing gear. It is attached witli ru l~ be rbaiids to a siiiiilar stru t fasteiiecl to tlie bottoin of thefuselage. Rub ber b ands are used to coiiilect tlie twosets of g'' diaiiieter struts to keep thein in place in tliealuiiiiiiuin-tube sockets.RUDDERTlie bottoiii part of tlie rudder is cut froin balsa andceinented to the bottoiii of tlie fuselage. Hollow out tlieiiiside of tlie balsa to reduce uiiiiecessary weiglit at tlierear of the iiiodel. A balsa block is added to tlie rear tip

of tlie fuselage to roun d out th e sliape. Tlie rudd er isstreamliiied into tlie cockpit.You'll iiotice from tlie drawing tliat tlie rudcler-ele-vato r uiiit is deinouiitable froi n tlie fuselage. I t is lieltlin place 011 tlie fuselage by rubber-aiid-liooks at tlie lead-ing edge and the rear spa r of tlie elevator. A in oval ~letab is built iiito tlie rudder. I t is inteiided for makin gminor clianges in rudder setting. Soft wire can be usetlfo r li inges. R ibs a re ~~ i i i in e t r i ca l . he longest r ib l ia sa max imu m tliickness of 1%" and tlie otliers varyaccordingly.

ELEVATORTlie elevator is rigidly built iiito tlie rudder. Astreamliiie or syiiimetrical airfoil sliape is used. Tlietliickness of the cent er rib is about 1". Tl ie slior ter ribsar e tape red to forin a smootli surface. Tlie tips aiid tlieceiiter are covered witli '/32" slieet balsa. Tli e elevatoi-sho uld be inou nted at Zero incidence-referred to tlietop fuselage longerons. Tlie tail assembly niust be keptlight-weiglit or the plane will be tail-heavy.W l N GT h e wing is built in two pieces-detacl iable a t t l ieceiite r section. Tlie rubbe r wliicli liolds it onto tliewiiig mount also liolds the two halves of the wiiig to-

getlier . T h e spars are spruce up to t lie 4th r ib froin tl iecenter. A t the center section tliese sDars ar e coveredwitli '/32" plywood an d silk. Tlie othe r

The model is a large one; its construction features many

MOTOR MOUNT

MOTOR MOUNTIS REMOVABLE

SC AL E - -i i i i i i i i i TI I

0 1 2 3 4 6

interesting fine points. Fiske Hanley, the Texaco winner, and the Texaco Trophy.


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WlNG D E T A I L T E X A C O T R O P H Y W I N N E R

3/16 X 1 / 2 1 / 318 X 1/4 114 X 1 /2 1 3 / 3 2 RIBS\ l \ I / ~ - ~ L A T I1 4 F L A T / / ~ / ~ ~IBS /I116 SHEET TO CORRCCT DIHEDAAL ANGLE


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F U L L SlZE WlNG R18 SHAPE

CUT 32 F R O M 3 / 3 2 ' B A L S A!/8" SPRUCE

TYPlCA L BOTTOM-FUSELAGE FORMER--3-PLY- 1/8 BALSAALL PATTERNS SHOW NHERE ARE FULL S IZE

T Y PICAL FUSELA CE FORMER

MODIFY SHAPE T 0 F IT WlDTH OF F U S E L A G E

FULL SlZE PATTERNS CUT FROM 1/8 BALSA-3- PLY NOTCH FOR 1/8 SQ STRINGERS

00


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MATERI.ALACO TROPHY ude ss o the r wise no te d )h i s m e thod o f m a k ing a two-pieceTh e leading edge of th e wing is cov-ered wi th &" she e t ba l sa ba c k t o thef ir st spa r - top a nd bo t tom . The r ef o r e,the f ront par ts of the r ibs wi l l have to

be notched to rece ive the shee t ba lsa .I n t he f ul l- si ze pa t t e r n , t h e e xa c t r ibpa t t e r n i s shown . Th e no tc h f o r t hesheet balsa is not included.W l N G M O U NTT h e m o u n t i s r o un d ed t o f it t h e t o pof th e fuselage. Spr uce is used, ade-qua te ly braced wi th piano wire diag-onal s. Th e m ou n t shou ld be rigide nough t o ho ld th e wing wi thou t a nypossible twis t ing in fl ight. I t i s a t -t a c he d t o the f use l a ge by r ubbe r ba nds .

COVERINGT he model i s covered wi th bam boopaper except over the shee t ba lsa cov-ering, which is silk-covered. I n Cover-ing shee t ba lsa w i th s i lk , take ca re towork out a l l th e wr ii ik les . Do pe a llpa r t s of t he m ode l w i th a t l ea s t twocoats of medium tli ick dope.

The a ppr ox im a te f o r e a nd a f t pos i -t i o i i o f t he wing i s shoa n in the d r a w-ing. Natura l ly , th is wil l va ry wi th th eparticular model. M ov e th e location ofthe wing m oun t un t i l t he m ode l t r im sa t about one- thi rd back f rom' the lead-ing edge. I / sM i ncidenc e i s pu t i n to th ewing. T h a t i s , th e f ront top-edge ofthe m oun t shou ld be I/s" higher thanthe r e ar a s m e a su r e d f r om th e topfuselage longerons . T he e leva tor an dthe rudd er a re bo th se t a t Zero aneles .The m ode l s e e m s to ha ve c onsider ab letorque effect. Ha nley used amp le r ight-thrus t in th e motor . Af te r take-of f , th eniode l c l imbs about 25 fee t , then turnst o t h e l e ft a n d a p p e a r s t o b e d i v in g a tthe groun d, bui; is in reality f lying level.When i t ga ins enough speed down-windi t s t a r t s c l im bing to th e l e ft . As longas the motor runs i t makes le f t c i rc les .Th e glide is in r ight circles. 250- t o

Fuselage8 3/8x%xG6" lon gero ns, br aci ng8 1 / 4 ~ 1 / ~ ~ 1 2 "iagonals1 1/4x5xl lM hardwood 3-ply , m oto rmount and fuse lage formers14 ~/sxl/sx48'' sp ruc e Strin gers1 I /4xs/4~8" spruce moto r mo unt5 &x25/sx24" top fus ela ge formers4 &xs/4~!24" bottom-fuselage formers1 '/s" I .D . x l2" he a vy a lum i~ iu m ubing5 f t . +V - d ia m e te r w i re2 ?L2 ft. .O5-diameter wire2 78 ~ 1 i /2~ 1 2 ' f o t tom of r udde r2 21hx4x5" motor cowling

300-foot diameter circles have beenfound most convenient for both powerfiight and glidi:.ADDITIONAL ITEMS

Th e to ta l we ight of t he model readyto fly i s 6 pouiids . Mi nor changes andrepa ir s have boosted the weight to 6%pounds without any effect on the f l ights.An impor tant fea ture of th is typemotor mount i s tha t i t i s shock-absorb-ing as well aS demountable for servic-ing and car rying.

$X17/~x3" rear ti p of iuselage&x2x24" top and bot tom cover ing10x12" sheet celluloid cockpit cov-ering4y2"-diameter airwlieelsignition switchauxiliary battery plug-insbattery-wirc clipsWing8 1/4~1/2~40" pars4 1 / 4 ~ 1 / ~ ~ 2 7 ' 'pruce spars2 1 / 4 ~ 2 1 / ~ ~ 1 7 "pruce inserts2 &x2xiPf ' hardw ood 3-ply centersection2 l/zxl/2x45" leading edge

1 l/zx'/zx'it ' leading edge center-section2 1/4~1~38"rail ing edge1 1/4xlx7" trailing- edge center-section2 3/sxlxlO" ti p2 1/4~13/f i~16"ip2 1/4~13/4x7" ti p16 3/ ,2~21 /4~24" r ibs1 I/sx2l/4x24" spruce center ribs1 2 3 / 3 2 ~ 3 ~ 3 6 " i ng c ov eri ng4 1/4~1/4~18"pr uc e wing m oun t2 i / ,x l / ,x lC spruce wing mo unt!2 1/2 ft. 3/32" diameter wire wingm o u n t2 . 010~1x10 ' ' shee t brass wing mount5 f t. .O4O w iri w ing mo un t

Elevator~ / 1 8 x ~ / z x ~ l "eading edge ,1/4~3/sx18'' trailing edge1/4~1/2~43" par1 / 4 ~ 1 / ~ ~ 3 3 "p ar1/4xlxl6" t ips3/xlx2BM ribs&xax12" tips1 /4~ 1 /4~ 14"ips.

Rudder2 3/32x1x18" ribs2 &x2xl8" covering1 1/4xlx24" outline1 1 / 4 ~ 1 / 2 ~ 1 4 "pars

Additional Items1 qt . cement1 q t . d o p e10 shee ts bambo o pap er (24x36")4 brads, soft wire, thread2 yds. silk covering for sheet balsa

TAYLOR CUBG A S MODEL

A tested and tried contest wi~iiier-soldby leading Department S toies andHobby Stores everywhere.Complete kit contains all materials forconstructing plane as pictured includingfull size detailed plans with pictures,clear notes and instructions. There isnothing else to buy except the motor.speckl COLOR CODE he lps ident i fythe different strips of balsa and bass.Complete Kit, less motor, 55-50with balsa wheels.. . .. . .Complete Kit , less motor, with pneum aticrubber airwheels and single $6.901 nole double throw snaD switch- -~~I I ( ~ da o slthsr K I ~s s i o f D s nv s r o r to Forslgnenunirlas.) I--. .-.SInCRO AC MOTORl /a h.p. 800 to8000 R.P.M. Oil-i t ehamplone a r l n g s .parkplug. Completewlth coll and con-denser . . . . . . .S13-76

B R OW N JR . M OT OR "D" $10.00C O M P L E T E O U T F IT S - P E E R -L E S S Taylor Cub kit with rubber air-wheels and double throw switch, BrownJunior Motor "D" and 14" $propeller. .. .. . . . .. ., . 1 8 3 0P E ER LE S S Ta y lo r Cub Ki t w ith r ub -ber airwheels 'and double throw switch,Syiicro Ace Motor and 14" $. . . .. . . . . . . . . . 22.05(Add Wc rottags to aII Complsts Oufltt West ofDsnvsr and to Forelgn Countrlss.)P E E R L E S S F L I C H T T I M E R $2.00

IMPORTANT ANNOUNCEMENTNEXT MONTH

-Fokker D V III , Cessna C37, Rearw inSpeedster, Waco Cabin, Red BirdR.O.G., Monocoupe 90A, Aeronca LowWing, Stinson Taper Wing, Howard'sDGA 8, Ryan S-T , N,ieupor t XV II Cl .Kinner Sport, Al Williams Grumman,Vought V143.1 0 ~O L I D M O D E L S - R y a n S - C ,Rearwin, Speedster, Seversky RT-8,Beechcraft B-17, Al Williams Gulf -hawk, Waco "D", Ben Howard's "Mr."Mulligan, Curtiss Ha wk 11 1C.25a MOD ELS-Cessna C-37, KinnerSport-wing, Monxoupe !NA, RearwiiiSpeedster, Taylor Cub, Heath Midwing,.Stinson Taper Wing, Aeronca LowWing, Fleet Trainer , Ryan S-C.SO C MODELS-Aeronca C-3, Haw kerMonoplanc, Fokker DVII, Taylor Cub,Junior Endurance, Mo,nocoupe, Percival"Vega Gull."MANY OTHEi tS5Sn Taylor Cub $1.0054%"C o r be n S u p e r A c e $1.95SU PP LI ES -A complete l ine of allsupplies for gas o r. rubber poweredmodels.Send Ie for eopy of 1838 eataloe No. 8 u i d f n a i la n.THE PEERLESS MODEL AIRPLANE CO.,3080 W. 108th St.. Clavaluid . Ohlo. I


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The Stoner-Stapilus design featuresa combination of rectangular andtriangular fuselage cross-sections.

STOUO P H YNNERR o y E. S t o n e r

a n d P e t e r S t a p i l u sI n c o l l a b o r n t i o n z c it li Q o i d o n S . L i g l i t

Complete plans for reproducing the model that won the Stozct ozctdoorevent with a /ight o f12:52.2-the 25th Air Trails championskip model.C REFUL refinement of every part lias resulted in areliable and dependable contest model. Th e 12 :52.2

flight last July in Detroit proved tlie value of de-sign changes which Stoner and Stapilus have been i~iakingin this model ever since its origin back in 1935. Orig-inally, the inodel Iiad a straight wing, symmetrical sta-bilizer, and a motor stick. Tlie clianges they've madeare obvious from the drawings and'photos. But evenfurther changes have been inade since the n~odel's win-ning flight last year. Photo of tlie most recent Stoner-Stapilus model is included with the views of the winninginodel itself. The plans and instructions describe thernodel flown by Stoner last July in Detroit.

FUSELAGEThe fuselage drawiiig is drawn to scale-the 1" divi-

sions are indicated around tlie outside iiiargin. Dimen-sions iiot indicated can be scaled off tlie drawing.

The tliree views of the fuselage point out tliat the cross-sectional sliape changes froin a rectangle to a triangle.Tlie two bottoiii longerons fair into a Single longeronabout lialfway back. Square liard balsa is used tlirougli-out tlie fuselage. Tlie entire fuselage on tlie winniiigmodel was covered with l/lo" slieet balsa inlaid betweentlie loiigerons and struts-fluch with tlie outside edges.As a substitute, sheet can be used to Cover the out-side of the fuselage. Apply it 011 tlie outside of the lon-gerons and struts-bending it to the shape of tlie fuselage.

ABOUT STONER AND STAPILUSThe Stout Outdoor Trophy Winner is the result ofthree years of design refinement with one particu-lar type. The work was statted in the early part of1934 by Roy Stoner and Peter Stapilus, modeling part-ne rs of Ro ckford , 111. I n 1935 a model of their designSet a new city record of 13:45, flying more than 7miles. The y spent the next several months cleaning up

their design and by 1936 they were ready to go places.Stoner and Stapilus both entered the Madison(Wis.) Stat e Centennial Contest. Stoner took twofirsts-fuselage and glider-and won the junio r high-point trophy. Stapilus took second in the senior gliderevent. From Madison they traveled to Detroit for the1936 Nationals. Roy took seventh in the Stout Out -door event.T h e 1937 National Meet in Det roit proved t o beStoner's big year. Th e Stout Trophy was his after arecord-breaking flight of 12:SZ.Z. His modeling part-ner, Stapilus, had bad luck. I n a tes t flight his modelStruck a fence and snapped a propeller blade. By thetime the repairs were completed, helpful thermalswere not available for long flights.Th e success of these two Rockford boys proves thepolicy of developing a particular design until it hasreached its maximum in performance. Winning theSto ut Trop hy doesn't mean th e end of development

Roy Stoner with a recent ver- with this model. Improvements have been made since Peter Stapilus ~ i t h Singlelast July and the Stoner-Stapilus design bids well toSi0n 0f the 1937 Stout willner. t w n in an even better showing in Det roit this summer. Pusher of bis own design.


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MEDIUM GRADE-STRAIGHT GRAINED

SlMlLAR BUSHINGS-

NOS BLOCK

LANDING GEAR DETAILBALSA WEDGE BETWEEN

Tlie rear section of tlie fuselage is detaclied at a poiiit 7"f rom the rear end. Tl ie tai l sec t ion f its into t lie forwardPart in pluglike fasliion. g''aiiiiriated balsa is ceiiientedins ide the ta i l sec t ion to serve as an a i ic l ior for the rearliook and a plug to fit t l ie opening iii the front part of tl iefuselage.T h e bottom portioii of tl ie rud der is ii iade fro m S''sheet balsa ciit to streainline sliape. It is an integral Partof th e fuselage and serv es as a tail skid.C u t t h e n os e block fr on i b alsa l ~ x 1 3 / g x l ~ ' ' .Wlieiidrill ing tlie hole for tl ie propeller sliaft , note the 2 degreesr ight- and 2 degrees left-thrust. Busliii igs are inserted iii toboth sides of tlie nose block.Bamboo landing s t ruts a re r igidly fas tened to t l ie fuse-lage. Careful precautions have been taken to preven t tl ies t ru t s (1 / i6 xs ' r ) f rom breaking loose unde r rougl i l and-i n g s T h e inet liod of ancl ior ing the s t ruts is s l iown in t liesketch (not drawii to sca le) . %X%'' balsa is ceinentedacross the top of the s t r uts to prevent pushing t l i rough the

fuselage. I n addition balsa wedges are inserted be-tween- the s t ruts and t l ie s ides of the fuse la~e . T h e s eUwedges can be cemented directly to tlie sheet balsafuselage-side.T h e l a n d i n g g e a r s t r u t s a r e 8s" ong. L a n d i n ggear tread is 9" and t li e w l ieel s a re i iioved 1%" f ~ r -war d of tlie stru t-fus elag e junctioii. T1le Corners ofthe bamboo stru ts should be rounded off uiitil the stru tis oval cross-section.Nosing and ta i l sec t ion ar e secured to th e nia in sec-tion of fhe ' fuselacre with rubb er band s a nd hooks.Fine-wire hooks are ceniented to the fuse lage ( to pand bottom, f ron t and rea r ) . S imi la r hooks a re ce -meii ted to the nosing and ta i l sec tion. O n the ir mostre ce iit i iio del. ~ t o n e r n d S t a ~ i l u siave discarded tli isinethod in favo r of extra -tigli t plugs-front an d rear-which reniain fixed to the fuselage eveti after the ten-sioti of the rubber ii iotor disappears.

WlNG AND TAlL SURFACEST h e drawing of the wing and ta il surfaces is to scalea s indicated by tlie 1" divisioiis ma rked aro un d thebord er. An y addition al diiiiensions can be readilyscaled.Only the Center wing-rib has been chowii full size.The s l igh t t ape r (4" to 3%'') inakes it possible touse practically the sanie rib througliout with slightiiiodifications in lengtli and tliickness to suit tlie par-t icular pos i tion. F o r a t ruly accura te taper-wing,each rib can be plotted froiii the table of ordinatesgiven below tlie rib pattern.All ribs-wing, staljilizer, an d rudder-are cut fro in

l/l'' balsa. l / l" cliameter baiiiboo tips are used onthe three surfaces. Tl ie baiiiboo is pointed an d in-ser ted into the ba lsa leading and t ra il ing edges. Tl ietop surface of tl ie wing is covered with 1/16" balsainlaid between tlie ribs aiid leading and trailing edges.

FULL SIZE NB PATTERNSEIFFEL 431

010J0

WlNG -RIB-CENTERCUT FROM 1/16 BALSA

ORDINATES O F EIFFEL 431 AlRFOlL SECTlON0LEVATOR RB-9 RQD.- 1/16 BALSAs

UDDER RB- 5 RQD.- I I6 BALSA


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e bottom surface of tlie lviiig is covered with sheetlsa up to the first rib. It is inlaid flush with the edgetlie ribs and spars.Bot11 sides of tlie top of tlie rudder are covered withghts. The sun flashing 011 the briglit rudder and the

s to the leiigth of flight before passing out of sight.The rudder is cemeilted diiectly to the top of the fuse-

the last i-udder rib beiiig beveled to the slope of theof the fuselage. Tlie elevator is inserted through theof the fuselage. The 1/1[ slleet balsa covering on

fuselage is cut to fit the elevator. The incideuce isdegrees negative-that is, tlie leading edge is dropped

%'' bbelow the trailing edge. The wing has S I s "e iiicidence, obtained by ceinenting a piece of balsathe leading edge. The thickness of this insert will

the fore and aft position of the wing since tliesurface of the fuselage'is a curved shape. The wing

top of the wiiig and around the bottom of the,

PROPELLERSelect medium-grade, straight-grainecl balsa block.

i in the Sketch. Cut awayThe blades

r are sanded smooth witli fine sandpaperthen doped with two coats of dope with interniediate

Finish with olle coat of polish arid rub to aThe free-wheeler is added to the hub of the propellerillustrated. About 10%"-dianieter washers are iri-

The new version of the1937 Stout model fea-tures an inverted tri-angular cross-sectionthroughout the rear ofthe fuselage. Elevator

i s above fuselage.

A loop i r i the front of the sliaft to fit yoiii- wirider (notshowri in the sketch) will facilitate wincliilg the inotorfronl the front. The original Stoiit Winner was woundtlirough the rear of the fuselage.

The inotor is 16 strailcls of 3/10" brown rubber about2 8 ong. The winding capacity is about 700 turtls. Themotor is lubricated with a niixtiire of soap and glycerin-both available from the nearby drugstore.

In the evening air--calm with iio risers-the modelclirnbs about 80-90 feet until the initial burst of poweris gone. After this it continues to cliinb steeply to a highaltitude. The average dead-calm evening fliglit is wellover 2 iniriutes. Diiring the power flight the inodel fliesin tight circles against the torque (right circles with aright-hand propeller). In the glide tlie circle is alsoright-about 75-100 feet in diaineter.

Ready to fly, tlie niodel weighed 4.75 Ounces. Thewing area is 125 square inches. This brings tlie model wellwithiri tlie miriimum weight requireinents of 3 oiincesper 100 square inclies of wing area.

EIFFEL 431

ALL RIES CUT FROM

E L E V A T O ~

SHEET ALUM.B O T H SIDESSHADED PART


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NEW ANNUAL EDITIONF L Y I N G f o r 1 9 3 8America's Popular Book on Aviation

256 Pages-More than 250 Halftone Illustrations and Drawings-11 ChaptersI-Adventures Over Land and Sea. 11-With the Army Air Corps.111-With the Navy's Air Forces. IV-Coast Guard Aviators. V-AirLines of the United States. VI-Private Flyi ng. VII-Aerial ServiceOperations. VIII-Alrways and Airports. IX-Training and Educa-tion. X-New Things in the Air. XI-Federal Government Activi ties.

( Aeroriaut ical C ha rn hr of Comrnerce of America, Ii ic.1 3 U i U i B L l c r P la za , X ew Y or k.Ii Mai1 (postpaid) . . . . . . . . . . . . . . . . . . . . . cupies of FL T IX G for 1938.I ( nioiicy ordcr II eiiclose - I fo r $ . . . . . . . . . . . . . . . . . . . .I ( clieckI U.S.A. nn t l C a n a d a $1.50. Elaen liere $2.00

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .N a m eI l 'r i i i t or t ~ - 1 ) eI P . 0 . Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .I Xuiiiber St ice t. . . . . . . . . . . . . . . . . . . . . . ' . . . . . . . . . . . . . . . . ' . . ' . . . . " . . . . . . . . . . . . . . . . . " . . . . . .City S ~ i l t eSTOUT TROPHY WINNER fainous ai rplai ic and automobi le de-signer. Since tlien it has becoiiie oneof tl ie coun trv's o utst and ing modelawards . Following is th e list of mo d-MATERIAL REQUIRED 3 l?i,x%x18" ribs eleis who have held this t rophy:(Balsa unlcss otlier\vise notrd) . 2 !2i/2x3" aluminiim foi l top -r ~~ (l de r Josepli 11. Elir l iardt , St . Louis , 1930,Fuselage covering durat ion qnknown.8 1/s~?/xx06" loi-~gerons nd strii ts 3 & diameter 66'' bamboo t ips Enianuel Feinberg, Detro i t , 1931,ll~x1.7/x11/2 osing1/,xlljzx84" sheet balsa covering,\vlicels. tail pliig1/8x11/4x31/4" bo t tom rudder

4 &;x?/4~83$" bamboo landing gears t ru t s1 foot .040 piano wire, shaft, rear hook,antl axles6 inclies fine piano wire, nose and tailsect ion at tachnient hooks2 bushings, nosing1 %xl/4s8" landing gear brace1 l ~ x 1 ~ x 4 ' 'anding gear brace

Additional ltems1 11~x!2x16" ropeller block10 1/4"-diameter washers1 small p iece s l ~e et luminuin3 ounccs cement$ Ounces dope3 sheets t issur38 feet of V/,," flat broxvn rubberJoap and glycerin (rubb er lubricant)HISTORY O F THE TROPHY

The Stou t Trophy was pu t i i i t o co in -in 1930 by William E. Stou t ,

28: 30.J a m e s F. Parl iam, Indianapol is , 1932,di i rat ion unknown.l Iax\vel l B. Basset t , Phi ladelphia,192!3, "1:80.5.J a m e s B. Caliil l , Indianapolis, 1934,4:28.K e n n e t h E. Ernst , Indianapol is , 1933,":03.Er ~v in Leshner, Phi ladelpl iia , 1936,36:Ol.K oy E. Stoner. Rockfortl . Il l . , 193'7,l"59.2.

2 i;- diarnrter sX" baniboo t ips rnElevator and Rudder rn

1 &~1hx13" trailing edge m- ..24 1 &xl/qx5" trailing edge A Burnelli over N e w York L i ty .


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26/97

f fThe Bowlus "Baby A~batross

Plans and instruction~ or m a k i ~ g B Yfine f/ying modc/ of a moderjz sai/plane. P a u l P l e c a n

1~1'111ci t tg.su 1 I 7 i / l ; a t t ~V i t t f c r

T iE name Bowlus has been iclentified for years withthe finest soaring craft in Aiilerica. Already dis-tinguished because of tlle Albatross and otl-ier shipstoo iliimerous to nleiition, Bowlus is now producing theIhby Albatross. The new design is highly origiiial,strikii lg a pleasant note in this day of staiidardization.Th e model, with tlie cxceptioil of al~eratioi isn the sizeand area of the tail siirfaces and the atldition of diliedral,is 211 acciirate repro


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~ep0~6WC jusA


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sanding lightly between each. Allow a tleast 15 minutes between coats. Finishwith three coats of the top color desired.Sand between each with wet or drysandpaper. After the final coat, rub thefinish with especially prepared modelrubbing compound. Polis11 the surface

The Ross-Stephens sailplane model fea-tured last year's annual gliding andsoaring number. Plans appeared in

the December issue.

with a flannel cloth to bring out theluster.

LANDING WHEELMount a 5,#" M & 3T airwheel on a.028 wire axle. The assembly can beeasily worked into position and ce-mented throug!i tlie cockpit and wheelopening in the'pod.

TAlL SURFACESThe stabilizei. rib strips are all cut to

the same shape and size from sheethalsa hy means of a rib template. Tlieshorter ribs are attainetl h-y cutting one-tliird froni the leading edge portion aiidtn-o-thirtls from the trailing edge por-tion of each rih until the lengths niatchtlie plaii. Place the tn o stahilizerlialves-oiie left-liand, the other right-c:n tlie bench. Ciit the edges from sheetbalsa aiitl assemble the entire unit iiithe form by placing small blocks be-neath the pieces to be elevated. Afterthe ribs have been fitted and cemented,qhave the edges to the required cross-sictions-conformiag with the contourof tlie rib section. The rudder is con-structed in likc manner with the exception of the various detail s noticeable onthe plans. Since the edges are thickestat the point wliere the rudder lias thegreatest breadth, it will be necessary toiise the thickest sheet balsa required, forthe entire outline. The edges can becut from the sheet balsa, cemented to-gether on the bench, and then sanded

to a gradual taper toward the top andbottom.

WlNGSPrepare a wing rib template and cut

all the wing rib strips required, bothtop and bottom. I t will be noticed tha tthe sheet balsa spar tapers from its mid-point to the tip, being flat on the topthroughout its entire length. As wasdone with the tail surfaces, make theshorter ribs by cutting one-third of thesurplus length from the front ends andtwo-thirds from the rear. Slide thelower rib strips beneath the spar, pinthe spar and edges in place, (elevatiiigthe leading edge with small blocks) ,and cut the ribs to the exact fit. Thebutt rib is of Gff sheet and is solid.It is slanted &" for dihedral. The tipis a solid piece of sheet.

COVERINGRun the grain of the paper spannsise

on the nings and tail. Attach thepaper, first to the tip and butt ribs.stretching tightly until adliered. Dopedown the leading and trailing edges.The paper may then be lightly sprayed,the units being pinned to the benchuntil dry to prevent warping. Dopethe finished surfaces with thinned cleardope. Cement the ning pailels, thestabilizer and rudder to the squaredboom ends. Brace the nings with asingle streamlii~ed trut on each side ascalled for in the plans.

The Taylorcraftg a s m o d e l ,plans of whichappeared in theApril issue, wont h e E a s t e r nS t a t e s s c a l eevent a t Sev-ersky F ie ld .Ship built byP a u l P l e c a n ,flown by Roger

Hammer.

FLYINGUse a 100-foot heavy thread or light

cord for a tow line. Place a looparound the skid and move forward totow the ship into the air. The res?&-ance of the air will slide the tow lineoff the skid a ft er sufficient altitude 'lhasbeen obtained for gliding. Balance thejob with small pieces of lead. Glidingtrim can be obtained by gliding themodel from the hand over tall grass.

COLOR SCHEMEThe real ship is painted as follows:

white wings, gold trim; natural veneerfinish on pod; metallic boom; red, white.and blue tail. For simplicity, a blue orblack fuselage and yelloa or red wingsare suggested. The same tail designserves as a decorative value.

BILL OF MATERIALS1 21/2~31/4xl&" oft block1 1/ 2 sq. x141/2" medium st rip1 1/8~1/4~36"ard strip1 1/8~3/8~36" r d strip1 3/x2xl2" hard sheet1 Ax2x36" soft sheet1 Yax2x36'' hard sheet balsa1 &x2x2.lW hard balsa1 &x1/4x10" bamboo1 sheet Jap tissue1 oz. cement1 oz. clear dope1 piece .028 wire\voo


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K N I C H TReplt ca plaans of a greatBy W i I I i a m Win t e r

R E A T O R of t l ie grea tes t fu ro r in recen t yea rsamong light plane entliiisiasts, tlie Payne KniglitTwister, witii its tiny 15-foot wings, is the riiostinteresting of kit-foriii sliips (sliip can be had coiiipleteo r as k i t ) . S ize seeii is to be no handicap, for t lieT w is te r zips along at 160 in.p.h., cliinbs 1,122 feet perininute. Ceiling is 20,000 feet.The ship is one-place, its fuselage O E steel tul~iiig.Coinplete tlata follows :U p p e r S p a n 15 'Lower Spa i i 13'Lengtl i 13' 6" EngirieEi np ty W eigli t 460 11)s. La ntlin g Speecl 45 iii.p.li.Loa de a 75 0 111s.

BUlLDlNG THE MODELRefer to tlie bill of iiiaterials for diiiieiisioiis.C ut tlie fu selage, first to pi-ofile tlien to top oiilliiie.from a soft balsa hlock. Shape to tlie recluiretl crosssections and sand. Cut tlie tail surfaces froiii slieetbalsa, streainline tlie cros s sections, and sand. Like-wise, prep are tlie wiiigs. All flyiiig siirfaces ar e saii(lctlto a tap er in thiclcness. Coiistruc t tlie laiitlitig ge arfroni scraps and assenible tlie entire iiiodel \\,itli tliick-ened cement. T o coiiiplete, give tlie cntire surface a,filler coat of clear clope, sand liglitly, antl finisli in \vliitc.' \ Ioui l t prul~el ler n a piii, fi-ee to tur n.

BILL OF MATERIALS1 bloclc l@xl%~G1/~' '1 slieet 3/10x2x24"1 pair of %-%" wlieels1 via1 cenient1 via1 clear dope1 via1 wliite dope


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B Y L O U I S G A R A M IP L A N S D Y P A U L P L E C A N

INCE tlie new rules are based on engine displaceiiient tliesize of tlie ship itxlf becoiiies of secondary iiiiportance. Th ewing area of tlie inodel built for a certain engine is governed

solely by tlie opiiiion of tlie builder as to wliicli conibination isniore apt to succeed iii a contest. a fair clinib and a swell glide,or a swell clinib and a fair glide.

As tlie hrd erl in e of A aiid B Classes is approacliecl. a situa-tion trises wllich to my mind is boili interesting and beiieficialfor tlie builder. He caii build a two-in-one iiiodel whicli willhave one of the ahve- iiieii tioned combitiations for eacli class.1 And it is iiot the saiiie one, eitlier! A sliip witli 320 sqiiare

tlie other hand, poweredby an Ohlsson 23 (Class B ) , it willbore a hole in tli; sky when fully opened.

The Skylark was built with these thouglits ii i niind. Me-clianically it is siiiiple antl stroiig. Tlie ignitioii unit is compactaiid reniovable. The total weight as a Class B ship is 18 Ounces.That is using very light wlieels. The two-ounce differente be-tween tlie Bantam aiid Olilsson engines can be niade up byclianging the wheels for heavier ones.CONSTRUCTION

Th e construction of the fuselage is clearly sliowii in live steps.Use tlie cliart to deteriii ine the lengtli of Cross braces and up-riglits. The length of the side braces is not given because theyare left longcr when ceiiiented in place aiid trimmecl at the peakafter tliey are dry. Tl ie cap strips and stringers follow in order.The cap strips are .sandpapered half-round. Next the iinder-sluiig riidder is 6eii:ented in place, strengthened by a wedge-shalxcl brace wliicli fits ktween the two longerons.Cut out F1 plywood foniier. The Square Iioles are cut outWhich wi l l i t be, climb or glide? with a siiiall copiiig saw and the iiiotor bearers ceiiieiited in.Bend and attach tlie landine-eear wire with tliree sniall alumi-. W W~ h i ~i p has both, bot c l im b i n iiuni fittings. Ceiiieiit Iiardwood blocks beliiiid the biilkhead attlie poiiit tlie woodscrews Iiolding the fittiiigs run tlirougli, siiicetlie bulklieacl itself is iiot tliick enougli for a hrni Iiold.Glass B and super glide in U ~ S S Tlie bulkheacl is centered to the h d y with two locating dowels


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REAR OF F-1 ISL lNED WlT H F EL T


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Elementary Modeling: RubberHOW RUBBER lS PRODUCED

L&x L5 cdCeceedF m k ucps,t ~axs f e~ redo WaCck tr cha fd. ..

STANDARD RUBBER S lZESIk?boY= mi M6': 3/2 "0-Y = Y,'', 3A6: v4"

Low -W?d% 4,,,6&$;//usrctic*;l. ,i-gl&s*w,,llni. ,;

#- - - - - - - - - C MP / - I

(-$ MAXIMUM TURNS -4I


39/97

E lemen ta ry Model ing: RubberHOW RUBBER I S PRODUCED

Zubbev Co.p-WS 22are M Mahya, harkand S , v a3eed5 o f Hevea .

i3vaz&xsis, h g k . -

L&x is U,-fmnc tvee c475,traxsfevved to6 v y k s . . .

1 MAXIMUM TURNS ---)STANDARD RUBBER SIZESIk7h0~ / / z : v6';3h &&5t ~ ~ b b e ~S nrade tuO&Z&Y = '/B '; 3/i6 ': '/4" m'm.mze " 4 ~ t e v e f a&ss *

ta uniform M o d wi

rulrtanos fa ch


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3 2 Ia-ITS PREPARATION tke_e f i st. m a x . t~cvns)AND USE FOR MODELS 3 4W

"ROPING" 0R"PREWINI"New " l+O,&.X :I j I OPERATiur. ur i < u u ~ c l ~r * i > i ~ n c l \

--dFRONT ANCHORING -"3 ' r e / knot ~ibest vubbev s p hW& waskerx vekhvcevecv &W& ko(es-

REAR kura'woodd0we.L k'nds o f vubbevs h u l d be " STRETCH WINDING" PROCEDURE

MOTOR ARRANGEMENT IS A COMPROMIS

B = ncore stv&s, shvtevkuytk, @er prop, fewev turns


41/97

READ INSTRUCTION S CAREFULLY

k 7 d p m ; o di fd cau,or rubber uv yr~icpeW& sCmp1Cfy f d q ,kelp keep &M4z.Czer-

Heavy wooaiiaboxsvvesar

The new modeler should remember that his engine ir a pieceof precision oppa rotu s fitt ed t o amazingly Close tolerances. H eshould thoroughly forniliarize himself with the manufacturer's in-structions as t o its operation , never weighing his own judgmentagoinst th at o f engine's builders. H e is smart if he investr in thefew tools necessary to senice engine proporly rather than subiect-in g it t o posrib le abuse b y using impro per or makeshift tools. Partsbolted or screwed together should be tightened evenly and snugly.preferably after running engine. Never disassemble enpine unlessit is absolutely necessary.

Length of engine's life and performonce both hinge on type andarnount of lubricant supplied to moving partr. Mod el engines oftwo-stroke cycle type carry lubricont rnixed with fuel. oil beingforced b y compresrion to all pointr needing lubrication. Casto roil, a fi ne Iubricant, is usually employed in re ady-rnixad glow-fuels,odditional castor oil often being used during break-in period.However, if engine shows no tendency to "freeze" [tol eran cerreducing throu gh he at *expanrion unti l engine rlows or rto ps), noaddi tion al oil ir needed if needle-valve is left t o rich retting. Richrettings mean slow running. smoke, a relative ly cooler engine: lean


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G h P& goes'W'* kcn&-Y/ L.."" ' P--ov bru

I Lp eq&startkky pr-c-SET-UP, FOR ENGINE BREAK-IN

Me&u! ccrn pev.kz&Y.#I &t / ~w i f e Y y & e s b 9 e -

Glow-plugs are hea ted by batteries for ttarti ng, then continueow and prov ide igni tion b y heat of combustion. Check con-

cted glow can be observed through exhaust p ort withoutplug, thus assuring glow -plu g is O.K. fter starting, wait

lf ongine runs srnoothly without overheating, littl e break-in is

necestary. I f it overheats, make numerous short runs or a d d morocastor t o fuel, or drop small quantit ies in intake while engine isrunning; continue tn ti l engine loosens. Cover intake a nd exhaurtports to keep out foraig n matter between runs. I f engine lands indirt, remove plug, flush thoroughly in gasoline. then lubricato.

I f g l ~ w - ~ l u ~hecks O.K. nd fue l reoches intake, ongine ahouldstart after priming. If too Ioan, it ma y mako short, fas t bursts; i fto o rich. will run sluggishly an d smoke. G o easy on pri ming in or-haust or intako -onl y a dro p or so at a time. Flip pro p smartly,having it positioned on shaft for easiest cranking.


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Though the intriguing Half-A control-iine models are leaders inpopula rity, part icularl y among beginners in rnodqling they are notfwithout their shortcomings. With engine displacament reduced toa srnall frac tion of the size we have been accustomed to i n the past(a Half-A engine i s only one-twelfth the displacement of a ClassD .60 engine!) there is a corresponding reduction i n power. Thesmalter, lighter ships that result are more at the mercy of the rindsthan the larger ones and have littl e of the very "solid" feel weassociate with larger, more powerful control iobs. An inexperiencedmodaler with a new Ha lf -A control ship i s wise to wait for calm

weather. Follow the wind diag ram carefully for prope r operation.Jirn Walker's "U -Control" and tha new Stanzel "Mono-Line" are

the control systems in use nowadays. U-Control, with i t s inherentsimplicity, i s foolproof: it utilizes two tether lines to handle, move-ments of which are transmittad to a pivoted bellcrank, thence tohinged elevator. The lines must be kept taut, however, and suchmethods as outward offset engine thrust line, outward offset ruddertab, weight in outer wing tip , rnore incidance in inner wing panel,and rearward location of control Iine wing guides arm resorted t o invarious combinations to rnaintain line tension. These many "tools"


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- - -

ice flyer. Tell us w ha t other

H&& p&.&ss CUIiLS-L*& mo'7-Z o f Clean -

~ C M L L S ~ & ~ ~' p&k tku +;05--' . Mo* b(arrio W

EL EVAT O R Hl NG ES

-7- b-zJekhrport &*-M c ck yo-- W loww 0 SJ -

k,4&&i7*al '-sp+r "or -Erre h a k MU&rav s t r d ~ U h a r oa Mj?e W& f&r &- ~ a ~ p f i&I&o r d k r y gear h r rvcl rearrLz ed&5 &,2 k4.05 p**kka~rvriruse- yood t a r kZ s b ~ . ' ~ p . wiJ&s upIetCiq Moa&n fz+f i , s&z.c&* li.nes-

can be used to extreme, causing a crabbing flight attitude which isneither ef ici ent nor desirable. An untested model should in corporateperhaps two o f these wrinkles fo r a safe test flig ht: reduce them ar

s the flight attit ude i ndicates you can get by with.Hal f-A models ca n be flown on very lightest costing line or heavy

commercial cotto n thread. Onl y the ligh test wire lines need be used.HeavY threads can be w rappe d around the handle, while met al linesrequire use of a r eal to preve nt kinking or Curling.

Mono-Line flyin g presentr two outstanding advantages: longerliner can be used-up t o 100 ft. r a d i u ~ n dull control is main-

tained even if the line shoud become slack. When short lines areused, .0lbU dia. steel wire is specified, and when length is increasedt o 100 ft., the diameter ir. increased to .018". Smaller or larger sizesof wire affect control; don't use stranded or braided "cables."

It is best to balance U -Cont rol models fai rly nose-heavy. some-where near the wing leading edge. Mono-Line ships should balanceabout 25% of chor d from leading edge. Selection of woods, typeand extent of p ain t iob, wheels, propellers, etc. affe ct balancegreatly. lmproper b alance of a finished model can often be cor-rected with lead weights. 43


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M A N U A L 1...................************** . ******** e........................................ .....1

T OO L S AND MATER I A L S f i y u a ArW& -5pr'yinp ww*#&&.Pa5


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D

C3 -+Vl?P+ ?m

s

-Y J

.. .e JSa eolA6uo

Fs

Y J'G9 !%m


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There's nothing like long-lasting, power-packed T-56 for rubber-powered planes. Made of fine Brazilian para rubber, "T-56"is scientifically compounded to take maximurn winding ...return a high percentage of power . ..give consistent propul-sion, flight after jZight. Insist on T-56 and be "power sure."

. - . .. .

U N I T E D S T A T E S R U B B E R 2 C O M . P A N YR O C K E F E L L E R C E N T E R, N E W Y O R K


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struction. This ship is a tough customer in compet i t ion , havingwom $99.75 in prizes and cash. G o i n g to p r ess , w e h ear th a t i tjust too k second in the Pacific Co as t Championship. Timed fl ightw as 14:33, total f l ight 20:OO on a 20-second motor run. Therew er e 35 0 en t r ants r ep r esen t in g th e c r eam o f th e Co as t M o d e l e r s . MAN


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TU15 PORTION OF TRULING EDCE i S CUT FROY5MEET AN0 SCALDED 7 0 PERYIT TUE UP-BEN0


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T H E M Y S T E R Y M A Nwithout any tiglit spots on rods so themodel can leave gear \~ithouta hitch.

T o test-hop, set the ta b in fin in neii-tral positioii and adjiist tinier for abouttwenty secoiitls. Opeii up engiiie to alittle over Iialf throttle and give modela piish, and if it is beiiig flo\rn at an ytime in any breeze a t all, be siire tliatit is allowed to lea re lianccia l

SEND 10c FOR COMPLETE CATALOG.DE.\LI


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AERONCA


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by unms N o o N mHER I N OUR SERIES OF POST WAR PR IVA TE AIR CRA FT. TH lS FLY ING SCALE VERSION OF THE CH AM PIO N IS CAPABLE OF GOOD. SUSTAINED FLICH T

1 - -_-._- ---P -I /~xJ /~ ' '

SPAR ISTAKE T o M I K \ m ~ ' ~ ~ m

0UR iiiotlel is clrawii to a slwii of X) iiicliesaiid is exact ii i every detail, as factory ~>laiiswere iisecl ii i its iiiake-tip. I f you wisli, theiiio to a suital~le ize fo rgas iiio


63/97

/ ALL TAIL SURFACES 3/8" SHEETAMER ICA 'S

TOP MIDGETRACER:Shoest r ing

Right from the desiqn drawinqs, thisU-con.bol fiying scale's accuracy i s sorne-thing to r a ve about. Let's 90, men!

\ VECO ELEVATOR HORN. { , 1/16" DIA. WlRE PUS HRO DSILK COVERlNG/ I

/ ,-1/16" DIA. WlRE SKlD fWlNG CONSTRUCTION1/16" SHEET SKINS1/8" SHEET RIBS1/4" SO. L. E.'/B"X 112" SPAR AERO- GLOSS FINISHBy S. CALHOUN SMlTH - R ~ - - E ~ X ,m Since the inauguration of t he Midget racing class in1947 under Goodyear sponsorship, the basement-builtpylon polishers have shown remarkable Progress in de-sign and performance. Race Speeds have jumped frorn165 mph (1947) to 200 mph, and the airplanes themselveshave demonstrated the high degree of craftsmansh ip andingenuity of th e individual builders in gaining so muchperformance from the 85 hp Continental engine.Now sponsored by Continental Motors, the midgetraces held in Detroit in September 1951 saw Shoestringa second-time winner of t he big prize.Pilot John Paul Jones, from Van Nuys, Calif., turnedin the highest qualifying speed of 197.2 mph, and flewthe r-ace to win at an average speed of 199.778 rnph.Which meant that some of the laps flown were well over 200 mph. Equal credit must be given to both pilot andairplane designer. Jones flew the Course like clockwork,emphasizing the valiie of precision flying as a race-win-ning factor. Rodney Kreim endahl, designer of Shoe-string, turned out a beautiful design with much attentiongiven to the other race-winning factor-cleanness.The ship is a high mid-wing with engine fairing fol-lowing through into the wing fillet-the most de s~ ra bl earrangernen t. All flying surfaces ar e filleted well into thefuselage. The flat-plate Cessna-type landing gear has agenerous fairing, and the wheel pants are relativelylarge. making for good streaml ining of t he chubbywheels. The bottom of the oil tank is shaped to lie fushwith the lower cowling line, and ex ternal fins ar e weldeddirectly to the tank to aid in oil cooling.

If it wosn't for that K I B angine and control line guide. you'd sweor this i s the full-scole Shoestring. Ain't rhe o mighty purty jobl


64/97

FUSELAGECONSTRUCTION : DOWEL OVERTURN TRUSS/ TRIM -FILM DECAL NUMERALS" ~ /2" C RU TC H /ORMERS DUMMY PILOT BLOCK BALSA COWL/4* STRINGERS HOLD - DOWN BOLT8 FILLETS/ / PLASTIC CANOPY / nBAL

A rewoike d Macauley meta1 racing prop is used andenginc exhaust stacks ai e pointed rearward for the smalladvantage gained by jet action of exhaust gases. Theoverall impression of t he airpla ne can only be describedas "solid." Proportio ns, moment a rrns. and aspect ratiosar e all sensible, straightf orward and bonest. Span is19 ft.. length is 17 ft . 9 in.Ttie lit tle speedster has welded steel tu be fuselage.stringere d and fabric covered. with all-wood plywoodcovered wing and tail surfaces. Engine fairings, cowl,struts and pants are aluminum. The most outstandingfeat ure of t he airp lane is the finish. The color scheme isa bright chartreuse and fire-engine red, rubbed downand waxed to the hig hest gloss seen a t the races. You canbarely stand to look at the ship in the sunlight!

Modeling Shoestring is a natural for flying scale. Theplans presented a re scaled directly from accura te three-view drawings supplied by the designer. The odd scaleof 1%" = 1' was choSen so the shi p would ha ve a reason-able size and wing loading. Every effort wa s mad e tokeep the construction light so good flight performancewould result.Span of t he model is 33" and leng th 31". Wing a re a is200 sq. in. and weight 28 oz., giving a wing loading of14 oz./100 sq. in. With th e K&B 32 engine the ship reallymoves and the syrnmetrical airfoil permits some stunt-ing, although the ship is not light enough to compete as aptrre stunt model. The symmetrical wing is the maindeparture frorn scale on the model.Construction d etails on full-size' plans available.

Shoestring spons a rnere I9 feet, yet flies a t more thon 200 mph! Sleek Contine ntal roeer took top honors ot two Natio nal Air Races.


65/97

Construction beginr when you loy out Nsd step is to brvel the Isading and trailing Build furelage crutch upride down over thewing rkins: cut out ribs. csment to edges; put wing skins in place, pin to ribs and plan to p view; add the formen. bo+tornrkin; add L.E.; rapaat for other wing. leading edge; tape th a tro iling edge int o position. halves and the rtringers. Then Is t dry.


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AIR-MODELR E C I S I O NM A N U A L

IA E R O B A T I C S

.........................................@hPREFLIGHT CHECK REMEMBER !

HAVE SH IP , ENGIN E, PROP, TANK, WIRES,IN TOP FLYING CO NDITION. TUNE ENGINE KEEP WIND ATTHEN HOLD MODEL UPSIDE DOWN T 0 YOUR BACK -CHECK PROPER R UNN ING FOR W H l U DOlNGINVERTEO FLIGHT. MANEUVERS !t.--

-CCLIMB - DIVE-ASSUME THAT ALL CONTEST DAYS WILL BEWINDY - SO PRACTICE FLY ON WINDY DAYS T00 I

MORE UP CONTROL

ASE IN UPCONTROLLOOK L/KE THIS-

OF PULL- OUT AS YOU -A l N S K I L L

STAY HIGH

INVERTED FLIGHT LEVEL OFF-START NORMAL LOOP

UP IS OOWN - OOWN IS UP !


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o#en

rovamants e r p ~ k l l yw theItyet. Tal1 ur wbat othet INVERTED FLlGHT RECOVERY

OVER THE TOP

FULL DOWN

HORIZONTAL ElGHT STRETCH OU T THIS PARTT H E "s" SHOWN IN 5 IS GO00 T 0 A FU L L L A P - T H EN 2T R A l N l N G F O R E I G H TS T H A T OR MORE-COME NEXT-

\ f OVERHEAD EIGHT\ IS HORIZONTAL EIGHT MOVED UPT 0 DIRECTLY OVERHEADSTART LARGE

O UT L l K E T H I S

ouTslDE C LI M B T 0 AB OU T A/-- _ _ _ _ - - - - -

FULL DOWN

TRY T HIS VARIATION OFOUTSIDE LOOP STARTINGFROM INVERTED FL lGHT

0 0 P10,0 .

VARIATIONS


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Fokker's Latest, the D - 2 3 FIGHTER


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R E A R W I N S P E E D S T E RA N A T I O N A L S F L Y I N G S C A L E W I N N E R

F P Most of t l ~ eletails of construction a re explained i n the draw-

Above-The authorand the championshipmodal. Right-Withtrophies at 1939 N a-t iona l~. H e also won &Air Trails flying course.

0on.

th eIt

nioiwil

-e itiip1 be n

~ortatitoted tl

:arrar

ttle~ r k

Iias been shaded in for clarity, and that tlie two top mainloiigerons are perfectly straight in the side view. as the thrustliiie ruiis directly along the top ~mr ti on f these longerons. Th is 'iiieaiis that after the two sides Iiave been assernbled, the fuselagecan be I>uilt in an inverted position on the workbench to insureabsolutely perfect aligiiiiieiit. Note also that there a re no crossbraces in the upper portion of tlie fiiselage. Tempora ry bracesare used until the bulkheads and striiigers have been cemented

P L A N S 9 1 P A U L P L E C A N

During tlrc 1939 Nationals, Akron's pridc und joy, HetiryThornas, Oecatnc National C ham p. Netting a first, sccond, fifthand eig hth place in foicr n v c n f s , c rar1 up thc Righest scorc ofpoints arnong the 70 0-o dd cntries to win thc Air Tra ils jlyifigcourse w a r d . T he ~rtost rtaportant of H ank's placing wa s tliefirst iti the Opert Class Flying Scalc cvent. H is K e m i nSPeedster, Ouilt to a scdc of i/8" = I', shyed ciloft for approxi-rnately 50 second s oti the first twlo oficial jligkts. O n the thirdatte t~rp t, ver otle rninute wa s madc, thank s to adju stt~t ents tathe first huo tries.Due to the "heefy" construction, tlie Kearwin came up to

weiglit rule bi thou t the addition of clay, a notable point to keepin niind, as every ounce of weight is used for strengtli or flyingpower. Many iiiodel builders like to bring along an old modelfor the flying scale event, loading it up with clay to bring it upto weight rule. Th is may be tlie reason why flying scale con-tests in the past have sliowed poor flight averages, since themodels carried "pyloads."

1 N A T I ON A L C H A M P I O N

in place. I.ater on, they are slicecl away. as tliere would be norooiii for the rii l>lxr nioto'r if tliey were left ii i place.

Use tlie hardest 3/r1n Squares tliat yuu can get for longeronsto obtain niaxinium streiigth. Th e fiiselage coiiies apart (j us tlike a cabin niodel) ktweeii Foriiiers I I aiid 12. A cross braceis used under Foriiiers 11 and 12. and tlie tail hook is securedto tlie rear of tlie cross brace under Fornier 13. Th e portioniiiider Foriiier 12 sliould k filled i i i with Y/3/ sheet, as thispart of the fiiselage must staiid a lot of Iiandling. The noseblock can be made reinovable as in a cabin model, but the origi-nal was cenieiited in place aiid sanded to fair into the softbalsa planking wliich exteiids hack to Foriiiers 2 and 5. AIiardwood plug, as illustrated , sliould be used if the nose blockis cemented in place. By usiiig air wheels and connecting theiipper ends of the landing gear stru ts to the fuselage with wire,sliocks due to landing or a dive can 1K taken care of niost effi-ciently. Tlie wire should be ceniented to the leading and tr ail-ing edges of tlie landing gear st ruts . and sliould be covered witha siiiall patch of silk, wliich will serve to conceal tlie wire andto streiigthen it. If plastic wood (cement and balsa sawdus tmixtiire) is used, there iieed be no fear of t he wire loosening,as the w d nd ceiiient sliriiik, forniing a viselike grip aroundtlie wire. Be Sure to allow tlie plastic wood at least an over-night drying so that it iiiay hardeii well before you attempt tosandpaper it to sliapc.

The entire wing may 1K made of niediuni-soft balsa. as tliestri its give the wiiig pleiity of ex tra strengtli. Tlie ribs can belightened consiclerably by reiiioving the eraser froiii a pencil andpunching sniall holes in eacli rib. Tlie tail surfaces are 3/3/deep tlirougliout, aiid all tlie necessary strips and curved partsniay be cut ou t of medimii sheet balsa. tliick. Do not for-get to add the wire Iiinges ktween the control surfaces beforecovering, as these should be ceiiiented in place froiii the inside.

For best visibility, the iiiodel sliould be covered with dark-blue or red tissue paper. A silver trim will help for visibilityand will catch the judge's eye wlien he is considering the m+elfor points on Finish. s e a soft brush that is about 3/( widefor color doping. as the dope can be applied niore quickly witha wide brush, lessening tlie aiiiount of brush st reaks that ar ereadily discernible to tlie eye. Silver dope has a bad habit ofsettling qiiickly, so keep a small length of wire handy to sti r itup regularly. Keep the dope properly thinned out so that itflows off the brush well. Above all, keep neatness


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Fd By FRANK LASMkK und CAL SMlTH

Ohis Navy pafrol bomber scales down info a dairly simple twin-engine control !hera A little-publ icized phase of Naval operat ioiis 1s long-rariqe The M e~c ato r orrnafly carries a Crew af nine men. Ther epatrol work The smaller fightcrs and anti-submarine ai- is mip le armament. The nose and tail tiirrets.cai.ry >Xi-mmtackers mzy have more roar and zoom, but prominent in tbc giins. The top turret has 50 caL guns. The large homb ba?hacligrourrd is the big solid patiol plane. It's not the fristest is fitted ihr carrying tnincs prim aniv . Scarch ra dar rrndaircraft in the Navy but it can fly for liours on end tl~ rou gli long-range efectronic equipment enable i he hig. ship toa!i kincis of weather to seek out and photograph an approacki- fulfili its reconiiaissance rnissions.in q encmv. sow mmes and be a u-atckdog ove r t h ~ation's The twin-engiile m d e l fan \vif1 find the Mercator a realsea appioachcs natural for building and flying. Thcr e ar e lots bf straightMaltin 's P4M-1 fulfills all the se frrnctions admirab ly Naval lincs to make the joh casier and the size is not unwieldl)aviators who fly i t claim it to be more trouble-free than Scale:1 at 7/16 in. = 1 ft. from factoiy three-views, th emost. It has no bad habits, ?rid altliough patrol fiying can be model has a span of 49 7/8 in. and a length of 3'7~/up Th eerueling the P4M rnakes the lob less so original mcdrl was patterned after the protolype XP4M-1:Thp Mercator is a big aiipJanc spanning 1x4 ft. and IS84 f t . however, the plat-6 ineorporate a few changes inade in pro-lo i~ q Thouqh pretty conventional in appcarance, ther e are a duct ion ai rcraft vvhich won't bother th e flying qualities.fcw srirprises under that blue paint. She's not a hi n- en gi nc Changes irom protolype are: Fin and rudder are enlarged.aircraft Those biq nacelles house both prop and iet engincs. tail tu rrc t 1s exlended, wing has flat center section withTw o 32.50 hp Urasp Majors turn the piops atld two Allisori dihedral outboard of tiacelles. T he original had straightJ33 turhojets deliver 4000 Ibs. thru st each Ablc to crisc dihedral.at a comfortable 200 rnph for 3000 miles, the prop an& let I t ivould be fine if every model could be scaled downcornbinatron boosts s p c d to ovcr 350 mph when additional exactly with everything a mm ia tur e dupl icat e of th e bigspeed is needed. Tke k t s are &SO used Eor tak e-0 3 urhen airc raft . Sirch is not alway s the ca..e, howeve r. Props.heavilv loaded wheels and other little item don't alwa ys matc h sizes avall-

To facilitate good flying with reasonably sized props, Although'fvselage iooks quae streamlined, because ofncrceJIeshave been maved ouiboard 5/16 in. ta perrnit straight top it is constructed with little diffrculty. Topprop ctearance. Gear was extended. half i s built first an crvtch, planked.


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able commerciaiiy. So some allowances must be made withsome deviation from scale in the interest of better and easierbuilding: The Mercator has a few deviations from scale,which we hope won't make anybody mad: Nacelles ar emoved outboard 5/16" to permit prop clearance at fuselage.The landing gear is extended 1" o allow more prop clearanceabove ground. The size of nose wheel is increased from1%" dia. to 2" dia. for better ground handling.The original model weighed in at 4 lbs. even, with ignition0&R 23's turning 9/6 Top Fiite props. The ignition Systemweighs oz., so flying with glow engines would save someweight. K&B .19's a re shown on plans; props should be 916Top Flites cut down to 8%" dia.Construction is conventional throughout. Fuselage iscrutch and former with strip planking. Wing is built upwith sheet planking. Tails are solid sheet and nacelies arehardwood, balsa block combination. The originai model hadwing removable from fuselage for ease of transportation, butthis feature need not be built in if you prefer a one-piecemodel.Construction can be started with fuselage. The crutch islaid down over the top view a n4 the top sectiori of theformers are cemented in place. The lower portion of eachfonner can servp as a crosipiece between crutch or 48" X M"or %" X ji" strips can be used instead. Note that formers4T-5T-6T-7T ar e duplicates of each other with minor vari-ations over wing center sedion. Plank top portion of fuselagewith 48" X %" Strips. Make provision for removable section

between formers 6T and 7T if wing is to be removable.When planking is complete, the structure can be takenup from workboard. Make horizontal tail surfaces now.These consist of Ih" sheet tapering in thickness to Y4" attips. Came syrnmetrical airfoil section. Note separate controlhoms on each elevator. Stabilizer and elevators are joinedwith E'&Bhinges. Stabilizer halves are joined with Y4" ply-wood joiner. Stab should be fitted in place on fuselage,carve planking to match lower curve of stab. Cement Y4"plywood bellcrank mount to bottom J crutch betweenformers 6 and 7. Make up forked pushrod and join to bell-crank and elevator homs. Check for good free elevatoraction before proceeding with fuselage construction: Remedyany trouble now, before fuselage is closed up for good.Proceed next with bottom portion of fuselage. Install CO&-pit floor before adding fonner 3. Add Y4" X lh" hardwoodstrips across crutch for wing hold-down nuts if desired. Bendnose gear to shape and install on plywood former 3 beforeputting former in place. Add lower formers along enti re fuse-lage. Don't forget wire skid and %" X I$'' haewood mount.Complete planking of lower fuselage. Tail tu rre t is cawedfroh block balsa, nose turret can be carved from block orsimulated with clear plastic toy ball or ratt le if proper size isobtainable. Cockpit canopy is not available commercially soone of proper shape will have to be made. Dorsal fin,h ndrudder are carved from sheet and cemented bi place onfuselage top. Note front part of fin extends down behindformer 10. Rudder is offset to right about H".

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OURTISS FALCOH A91B ATTACKYLICC LU- m A i L I n a LDICSRO CXQLCTIONAL m c r m

I / @ - X I?. TR AILIN@ cmc

I/@ "X llt' @ U S ATRAILIYO cm cOUT ALL p * e R R S- ROY I/* S n c c T ULU-

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3 / 3 Z " X S / I S "W A R D W O O D S ~ U T ~ A M 0 0 0LERO* SL IVCRUSW ROD

SOLDCR WA WCR T 0 AXLCT0 RCTAlN WHCCLS

1-114' VCCO R UI ICR TIRC WHCCLS -TAIL IS VCLLOW-

.'RCV-UP- ALUYINUYSPINNCR 01) @ALSACARVCO u l * *CR

SC T mrn w i * o s-AT ZER0 .IciDC*cc-


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-oe'pse~. P.wuUesj.ao&U:1A-+

jua1 mae.,


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Let Lt. JAY D. BLAUFOX, FormerRoyal Air Force flier, ~ i v eou33 LESSONS

SE EIN FLYING Rin his new, step-by-step, training bookiwrr r a t .

You wani 10 IYLi l l le Planer Asei n d Lrrd illingurns aad inrci-01ConliolrTake OnThe ~ i r

Readv To Snln

t l i a t wi l l :- - c i i t ).ur w r n i n g t i i ne

- - I i e l p y o u to i i i e e t c i i i e r g c n ci c s- t c a ch y o i i t o u s e i n s t r i i i i i c n t s- c n a b l e y o i i t o d o H y i n g s tu n t s

s h o w ~ o ur i c k s of a i r f i f i li t in fi. . .~ir,i - - - -, n i a k e y o i i a s i i i a r i e r p i l o tS ~ ~ U ~ W ~ S ,-lszl I

11 m-L"m - - S.A\VI~ O U ,I.IME. HONI:Yng inrirumrni~. L- .MORE 1RAY......Inrliumenls, -11 100 im*~ ,~ , . I I I ~ Y : han he a I e ~ i n .Miinlcnanrc.1 0 w d w e 1P.TrO U Send C. 0. D.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ne Miinlrnancr. NAME11 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .l)l>KI;SS

I V flylng . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ITY WATE

The Crossl~ow LauiichThi l gr ;i i lr Il1c 1;iiiiicIi.

H y t l ii s i i i i i i t l i e l u>\ v I i o i i l d I) t t ie r~ : s i io da rk i r lt l ie s tr ing. T l i is s t r ing rai i ,wrvr asa guide iii in i i ig iq) tlir Imw as wr l lns I io l~ l i i ig t i n r i la rc \ \ l i ile th r c r -mei i t is ~ Ir y in g. .4s t l i is c rniei i t jo i i i tinus t IICtrong, use 11hiitg of c r in rii th u t ~ l o ot p ii t one coat ovvr ;t i i-other till t l ie jirevioiis onr is I l inr-oughly dry. .4hoiib live co;its - li oi i l ~lgive a goo thc t ra i l ing e~ lge fth r s ta \ )i l ize r ~ l o n n n the le f t side ,I ~ w ~ k i i i grom the lro i i t of the gl i i ler.' I' li is wil l pivc the ship n nice tur na i i il w i l l n o t a l low t l ie g l i ~ le r o loop,I i i i t l r t i t c l in ih t i l l a l l the power islost . n i i i l at thc ei icl 01 t l ie r l im h t l iei i os r w i l l ~ I r o l ) i i i t the tni l wi l l r ise,siiicr 1>y \\,arpiiig the sta hilizrr ( low iii t ncts the .sanic as a lif t in g tail; this;il lo\vu the tail to I>e smallr r i n s izens \vrII $15 i inproves the pl i~ l e.

H y t l i r \vay. you r ai i i ise t l ie r ross-I)o\v t o (1 0 sonie balloon biisting. Al lJIIU ric c~( l o nia ke i t in te r r s t ing is togr t a few fel loas and see how wel ly o i i r a i i I ~ r i i i g l o w nhe gas t)iibbles.4 p i i i i r i t l ie i ioi ie n i t l i o i i r i n eacl i\v i i ig t ip wi l l p iv r yo i i n pood chni iceto bi is t t l ie Iml loon.


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T E QU ICK I E is clesigned for swift construction and snappy~>e rfor ~ii ance . ltliough we do not recommend trying t o1)uild it at .a siiigle sittii ig, two eveniiigs should be sufficientto get it into the air. Structural pieces are held to a mininium;curved sections of wing and tail ar e cut froni slieet balsa in theeasiest iiianner possil~le. Minutes have been sacrificed here andtlierc to provitle a few frills to niake the job inore attractive.

CONSTRUCTIONFuselaqe. Tlie side view is syinmetrical, both %'' Square lon-geroiis followiiig the saiiie bend. The nose cross pieces arewider to take knocks. The top and bottom cross pieces aresliown in a group. h'o top view is necessary. Lay \rrax paperover the (Irawiiigs aiid pin tlie longeroiis in place directly ontlie plans. Cross pieces ar e cut to size and cemented in place.\Vlieri d ry, reiiiove tlie sitle fraiiies froiii the foriii antl assernbletheiii to eacli otlier at Stations 3, 4, and 5. Wrap a rubberhaiid aroiintl tlie iiose to pul1 it into position while its remain-iiig cross pieces are glued iii position. Pull the rear of thelongeroiis togetlier, install the rudder post coinplete with rub-I~er ook. aiitl tlie reiiiainiiig top and bottoin Cross, pieces. Cuttivo cabin sicles froiii g" oft balsa sheet and glue one atopeacli upper longeroii i ii tlie proper position. A '/I$ sheett)ulklieatL Iiol


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F R O N T V l E W OF W l N G S H O W I N G D IH E D R AL - LE A V E U N E S I DEF L A l O N B EN CH A N 0 R A I S E T H O TH ER T HRE E I N C H E S

P--- - . . - .- -C96 J.

$ SIDE V I E ~ ROP BLANK 2 2 PROP BLA NK


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Quickie I ( A REAb GASOLINE ENGINE $5- 1three pieces of paper, one for the bot-tom, and one for each side on th etop. At tach th e paper to end ribsand w i n g edges o n l y . Spray th e fin-

' ns on l~ niiinniill, iIldlnllilsn. 111.-"Jrntor is~rrnhled mr-r e p t ~ y .nd D ~ ~ ~ ~ C I I Y .nrn ruu? nnti~fied.''i.. c. . ciite.ao. 111.-"I iae ired mr mnior snd Inrn yutle astlsncd ind,surpr lsed i l lhe prals lonP 101 thc menrF:'

Psia 22-WB.. Brlllah-Comblne: Top.L. WIdsWorld: Cenl.. lohn Colllni: Bol.. Interna-llon.1.

OVER 15,000 KlTS SOLD I N THE LAST YEAR- - --Send f o r f ree l i t e ra t i i r r on G.H.Q. Gas En g ine o r send 6c f u r J u m b oF R E E Hobby Cata log and cho ice 01 f rer av la t ion o r wings l li n .

Send onh S1.OOPise4GTo~ . Al Darashl: DOPIIL.. EuItck:

IovrrL. . Al Dir.&; Bol.. Al Dirilhy. 1 6. H. Q. Mo ton . I ic . Dept . T , 40 East 2 1 d St., New Y r k . N . Y.

6 classic flying models

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