NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16
Edition: Model Aviation - 1981/03
Page Numbers: 14, 15, 16, 17, 18, 19, 20, 96, 97, 102
NO OCR TEXT NO OCR TEXT 1916 time period areas perform ance As planes period Bristol Scouts experienced number running changes various configurations serious modeler must careful select precise serial number chase down variables might particular plane Although C D models part looked pretty much same could several areas variation time least differ ences between RFC RNAS planes Other areas difference rudder elevator configurations ailerons cowlings differ ent engines careful research appro priate adjustments C D model Scout can constructed plans information provided article reason selection particular Scout DRNAS serial number 5393was access three excellent pictures showing good detail plane issue Air Power magazine model did start out Scale project previously designed built large biplane ultimately named Great Waldo Bipe published another jounral purely sport plane decided build stand-off look-alike plane some kind generally would fit parameters Bipe would almost surely successful through three seasons successful flying Waldo After good deal study sorting felt Bristol Scout 3 1 ft scale would fit bill As project kind tend look back through publications etc see what others have done particular subject aircraft process gathering more information Bristol Scouts could ever find indication aircraft although very well known much modeled ever done Precision Scale Unbeknown group highly motivated ingenious prankish guys Olean NY known STARS working parallel thinking eventually produced whole fleet magnificent stand-off 3-in-scale Scouts great fame project took permanent turn toward allout-scale learned Leo Opdycke published marvelous journal called World War Aeroplanes beginning construction full-scale replica D original factory drawings kind information would have fitting attempt anything other full-blown Precision Scale project might interject anyone interested WW aircraft should write Leo get mailing list no subscription charge 16 Model Aviation author Hank lltzsch isnt checking weight Scoutbut expressing delight finding no apparent damage after nosed-over landing weighs about 15 pounds Scout has excellent overall moments ana gooa iayous general Note large horizontal tail surfaces contribute exceptional pitch stability modelas did prototype .e completed temporarily assembled framework r.3 alignment flying surfaces control cable runs V V auvouVaLta1 a rt U LUI struction Overall s.e construction well illustrated 1/32 PLYWOOD COWL WRAPAROUND WITH 1/4 BALSA TAPERED OVER IT AILERON WIRES DISCONNECT AT ROOT RIB / F2 BRASS TUBING FOR ELEVATOR HINGES 3/1613/4 SPRUCE BEAMS CLAMP TOSHORT LENGTHS SRARS FRONTS BACK.OFINSIDE NYRODSI/3 PLYWOOD IN CENTER SECTIONFOR H INGE PINSMOUNT PLATE PROCTOR IDLER PULLEY FOR UP ELEV 1/16 BRASS STOCK SPAR CLIPS TOPAND BOTTOM EACH SPAR CENTER SECTION ONLY I/B PLYWOOD BOlT RIBS 1/4 1 3/4 SPRUCE CABANE STRUTS SECURED WITH PROCTOR FIlTINGS / 3/32 SQ SPRUCE DIAGONAL BRACES 1/32 PLYWOOC DECKING UP TO CUWLING FT 1/4 BALSA Q 4-40BOLTS THRUI/4ODRUDOER POSTI/8AWMINUM TUBING OR HOLD DOWN CLIPS1/32 PLYWOOD LAMINATED 1/32 WIRE JOINS ELEVATORS INTO ONE 3/16X 1/4 SPRUCE SFAR I/BBALSA RIBS 5/16 DOWEL FOR ELEVATOR -STABILIZER 1/32 PLYWflD BOTTOM TORQUE TUBES - 1/16 BRASS SKID FARTS 1/4 1 1/2 SPRUCE SKID 1/4 BALSA LONGERONS TOP-BE/IbM 18 PLYWOOD HORN TOP OF AILERON ONLY HEAT FRCN DOWN DUCT7 90 ENGINE BOLTS THRU WOOO-----------3L BEARERS UNDER /4 PLYWOOO PLATFORM MOUNTED ON 3/81 3/4 HARDWOOD BEAMS BACK TO F 2 F 1 1/4 PLYWOOD FIREWALL / TIE WIRE BETWEEN AILERONS I/32X I/B PLYWOOD LAMINATED FOR WING TRAILING EOGES I/B 1 I/4SPRUCE 1/2 BALSA SHEET LAMINATED TO FORM FRONT RING I/B PLYWOOD COWL MOUNT RING x 1/4 BRASS TUBE BENT ONTO LO WIRE SOLDERED TO 1/16 BRASS PLATE WIll-I SLOT FOR AXLE TRAVEL 5/32MUSIC W FAIRED WITH LAMINATIONS 5A6 10 BRASS CUTER TUBE RUBBER BUNGEE CORD ND AXLE AND FiXED RUST BELLCRARK FOR TWO LOWERAJLERONS1/4 11 4LSASFAR I/B PLYWOOO LOWER1/41 3/B SPA FILLERS FUSELAGE BRACKETVI NSIDE I/3SHEAThNGIlI 1/8 SQ SPRUC INTER SPARS I/B FUSELAGE DOUBLER t NI/4SOSPRLICE1/6 BALSAALLWI RIBS LEADING ELGES BRASS PLATE SECURES WIREIALTERR ATE TO BOIL UP RIBS -6 5/B WHEELSFROCTORTURNBUCKLES ALUMINUM TUBING AING TIP I/4STEEL ROD AXLE WITH COTTER1/41 3/4 SPRUCE INTEFfLANEAILERON BELLCRANKCtJSKID LOOPS frJTO BLOCKS TURNS IN 1/410 BRASS INNER TUBINGSTRUTS INTUPROCTOR SFAR CLIPSI/B PLYWOOD PLATFORMS CLARK / voluntary contributions journal wealth information subject area Let tell folks never attempted anything magnitude before plunged project giving myself benefit consultation competent shrink better yet experienced scratch-Scale man high experience I am sure project would have terminated plane would have seen light day Although biplanes general WW planes especially favorite subjects study modeling vague compre hension what involved project kind building second plane order lock details construction make few desirable modifications original work would occasionally stand back original plane say myself could possibly have accomplished through continued encourage ment friends Leo Opdycke particular along wifes enduring condescension came pass Although hope time published second plane will flying feel third fourth plane will required order fully correctly wonderful aircraft As Dave Platt aptly put never finish Scale plane just stop working reading have gone through process scaling up building WW aircraft will fully understand single biggest problem overcome plane airfoil section contemplating such attemptheed well following saga Bristol Scouts utilized modified Coanda airfoil section modified Frank Barnwell designed Scouts very thin flat-top airfoil remarkably similar Coanda section except unusual flat top Coanda airfoil covered EAA FULL-SIZE PLANS AVAILABLE . SEE PAGE 128 CABAS RRE ATTACH l/G2 BRASS BOLT UNDER CABANE ATTACH FITTINGS RD ENGNE COWL BLUDGE RIGHT SIDE ONLY WINGS LAMIN FROCTOR A-ADETAILWiN 3TNBCABANE ATTACH FITYMAS CMARE PROM /32 BRASS ENGINE SETIPROCTOR HE O GOWN THRUSTRIGGING CABLE__________ A-A DETAIL 3 RIGHT THRUSTINTERPLANE CGBANE\ STRUTS-MADE FROM T VIEW /4 B 3/4 SPRUCEiWIND SCREEN MAKE PER PLANE RENA MSDELED N 5393 WAS P4 LOWER CDWL CUTOUT PETTERN /7 jF H I II F-IF-2F-SF-4F-S DASH -OSS III PURE B COWERS TSR L AIR DUCTCARAFE WIRE ATTAC ARUWOGO ANCHOR 7 1/4 50 SPRUCE OCKPIT MADE LEATHER CDVI ROPE SPRUEE TO BALSA SPLICEI/A AOLSA SF-lOWE REAR TOWICKER DOTTED LINE FOR -\INTERPLANE STRUTS 1 'N CROSSB URBANE IIARUWUUU LG ALUCKI \ \ HARDWOOD REOCK SUPBOTOM PANELI REMO AR F FOR ACCESSCOOTROL STIC// MAKE 0 SUITEIII A/1/WING TIP SKID I\\GANUTACF- LU WIRE RET 1/EPLY 3/ROALSA /1 B NGEE CORD1/ WRAPPED 111LA-S/B WHEELS BA BE NDWRE S AEROTEC MOD ENG I/A ALUM TU SEAT-TC EATHEI CUI I/A 11K DIR LACING KIiLW DETAL B-B L HHI/B TYPICAL LACING PATTERN LOWE _____________________ 1/4 F 18 Model Aviation oie cowi GUS-OUT ana ianaing gear assemoly I-Irs TWO Days art wall later covered 1/32 olv removable hatches access Cockpit area scale seat already installed another look lower wing attachment points Cowl cheek bulge apparent Between stringers o.. uung edge covering less flatoriginal design reason unclear aunsing ror engine servo sloe air duct can seen iii Note lower right exit point engine cooling air duct STEGLASS FUEL GAUGES AYER LAYER-FRONT B BACK oO GLASS FUEL oI SAPQ RFC GASHRNAS GASHPlACE HERAS PADS ECACA ECAE USE FOR N-5393 FRONT FUSELAGE DETAJL 1/2 AZE FRONT DECK RUSTS LAD VESFUEL TANK CAP ON 3/B CENTERS 141/A GROLOC STRINGERS F-7BGEE TOP VIEW F-7A PROCTOR 2 TNB1/32 PLT 1/32 PLT COVERINGPROCTOR 321 ORIN STABILIZER CABLETOP PLATE SH FROM F-B322 PULLET1/4 BALSA I/4SPRUCEF-94-40 BOLT BLINS LAMINATES WOOS OR I/A 00 ALUM TURNS SEE NOTE ON STABILIZER CONSTRUCTION I/A 3/B SPRUCE 1/32 PLT STAB HORNS / 2-56 REAR STAB HOLSOWN STUS I/4sI/2 BALS2Ej''-iAi3S SPRUCE .-I \\ [1/ 2 N- U5A \t-- "-VA5 BRASS RUSSER HINGE POST ------~j"~'flI_S/IA SOWEL RUDDER POST ATTACHES I \I/ ---- / } Li I1/ IIv- 1/IASEASSTO HARDWOOD STERN RECE I/IS BRASS F---- PLY ER STUB CABLEBOTTOM PLATECABLE EXIT 3/32 SO SPRUCEESITI/4o 1/21/lEA 1/4 1/4 BALSARECESSES 1/16SPRUCEBRASS SHOLD /32 FLY 1/16 SOWEL F-I 1/4 BALSA TRIANGLE STOCK IAIR DUCT IPATTERNS FRONTSIDE TOPRECES BOTTOM OWNI FRONT SIDE PIECE EXIT PLUSH WITH FRONT PLY BOTTOM PANEL SPLIT PIN NOTES WING SPUN 73-3/4 WIND UREA 1910 50 IN LENGTH OA 62 WING OHEDRAL 3 WING INCIDENCE 2 30 P05 WEIGHT 14 TO 15 LBS STAB INCIDENCE 0 TO 2 P05 POWER 90 CU IN OSPL PROP IA 4-S PITCH LANSING GEARS/32 MUSIC WIRE MAKE FROM 1/IA STEEL OR BRASS EE WRAP AXELI LIrIAT GLO0I23456 BRACEREAR LG LEG WASHERS 1/4 00 COPPER Th I/A STEELFRONT L S LEGBRISTOL SCOLITD AXEL BRASSFUSELAGE TOP VIEW WASHER SCALE 3 ISHEET OF 4 1/4 ID BRASS AUELASSEMALY-I/4 STEEL ROD- 1/4 15 BRASS-S/IA 10 BRASSDESIGNED BY HANK ILTZSCH ——DRAWN BY BRIAN VOYER 1-INKED BY ZOE DEMASCO ORASS C~4RS SOLDER ON S/IA ID BRASS 3j BUNGEE WRAP /0 CITE RN IURLITE PLC GUSSCTU / /055 SPRUCE / EPSO RAS I/A FLY UR CITE PLC I/A EDERSA TA ONASS STUCK U BOLTS SE NI DEC S YOUR UPPER ALERI4 1/32 CABLE PUT SEE I-SA SPOUT F RNZZZZAZUTCTL A//AA/2///A 1/16 CORPER SR 3/A 55 SPRUCE SS DETAIL A-A FRONT 2012 SPRUCE HA1NH-NA YORNDELWAITE DETER RINS TSP ONLY SEE UT4ER SYRIETI 3/16S 1/32 PLC GUSUSTS TYFICA ALL RIDS ALT COAST /8 SALSA GUSTET TYPICAL ALL RIBS / WHITE ALCEONATE CUOST /DE BA TAPERES TRALINS EDDE STUCK FYAODWUDE STRUT ANCHOR OLUCKS SEE UTFIER SHEETI RED /0 PLC REINFORCER NII NII NII BASS SPRUCE LEASING ESUC ALTEONATE CONGO USE IUOIU BLAB TONING FOR ESSES 13 55 SPRCCE I/O SU SPRAUC NNULS L /1H UC ILBAr 1/ ERR SO BA 16 NU~,I1JOWERWOO \\1332 PEY 010000 ODE REGS IN 004 TOP OF LTERN COAST JPHOH 0003/0 55 SPRUCE I/A 3/B BALSA SPAR CAPS AORAYYO CARROTFOAl/U FOR AlL ODESSPRUCEI/A SOLSA Y IS VA SPRUCE AUOCCBL / I/BA VA SPRUCE TOBLINS ESUS DECKING PATTERNS LAMPLATIOAS VA /32 PUT UrUSA56 BRISTOL SCOUT- D RIGHT WING PANEL SCALE 3 SHEET 4 OP4 DESIGNED BY HANK ILYZACH EWAWN BY BRIAN VOYER INKES BY JUC SEMARES March 1981 19 handbook airfoil sections data co efficients lift lift/drag ratios data can seen Coanda very good airfoil What flattening-out top section does would pure conjec ture no data apparently exists Bamwell modification Unfortunately information uncovered after completion original plane onset problems proved later directly related unusual wing airfoil felt quarter-scale size would get performance somewhat comparable full-scale plane Reynolds numbers larger scale generally favorable reports full-scale plane sweetheart flier went blithely forward duplicated airfoil section faithfully story planes quoted often flew right off drawing board minor trim changes etc plane completed weighed just under 15 lb equipped OS 80 almost 1800 sq wing area gave awing loading right 20 oz power factor about 300 ox/cu should no problem said stats almost identical Waldo Bipe After several abortive attempts get flying time changing adjusting something finally got air flew like pro verbial stone could barely get out its own way Altitude come dearly anything less full power would initiate descent power offdead engine began very rapid fall sky glide angle approaching 900 Subsequent test flights pretty much same power-on landings dis graceful would approach normal landing no flare out would simply quit flying few feet above ground Continued page 96 1/4 BALSA SHEET FILLER PLY HARDWOOD END NESAERS HARDWOOD ENS BRACE~ 1/4 PLY ENGINE PLATE V4 BALSA FRONT RING I/B LITE PLY NODE DOUBLER WING A-A -Y F F-4F-N DFft OSBA -/4 50 -SPRUCE -.4 US AIR DUCTR0O KISAIL, KSERVO L ----K--0 0 I/B PLY RUR BAR V2BALSA COWL RNOS1-~ 1/4 50 SPRUCE 3/8 HARDWOOD ENGINE NEARERS COWL MOUNTING POINT BRISTOL SCOUT-D FUSELAGE TOP VIEW SCALE 3 SHEET 2 0F4 DESIGNED BY HANK ILTZSCH AWN BY BRIAN VOYER INKED BY JOD DEMARCO 0/00 PLY FGNSE 2-I/O SOS HARDWOOD ENS BRACE 1/4 PLY ENGINE PLATE 0TO SUTE ENS 7 7 00 F 1/4 PLY 0I23456 I/I6 WIRE LERON CONNECTOR 1/4 F F F FBA 1/4 BOLSA NC FB /8 CITE FL U I/U P05 RIGGING VIEWS 02 PC15~ F1YINO WIRES SOJALE 3 500 RIGGING- PROCTOR HO CABLE 3 TURNBJC4LES 20 Model Aviation uclells oecome Clear view AflO thats what iRiBU cowling should look like Note landing gear limit plates bungee attachments fabricated landing gear leg Engine air duct intake readily apparent Cabane wing center section mounting ihis early pnoso snows seven fuselage stringersa technical error corrected later plans OK Ileartuselage snot Illustrates functional tail skid rudder post stab alignment pins front hold-downs Bristol Scout/lltzsch Continued page 20 thump down gear bending axles point tended blame some problems center-of-gravity CG placement deficiency power So installed Profi 76 performed about 20% better OS 80 Waldo Bipeand played CGall no avail Performance still lousy flew barely Much head-scratching deep thought finally laid blame airfoil analysis flight deficiencies definitely pointed way bipe builders know building two wings about twice work single wing came conclusion airfoil needed modified changed order achieve flyable model properly meant con struction whole new set wings Much study airfoil sections followed didnt want deviate scale undercamber searched section would esthetically accept able still give required performance decided gamble ISA-961 section EAA handbook paper looked very good might interject time feel EAA book airfoil sections should scratch-builders book shelf have found data relates quite well models compare data instance ISA-961 Clark Y section would find quite comparable performance know Clark Y good lifting section though slightly high drag still gives very good lift/drag coefficient As wanted get new set wings built quickly possible used alternate wing construction method shown plans uses a ribs rather spruce-capped 1/32 ply ribs original standard trailing edge stock aluminum wing aileron tips place laminated wood tips used original method construction new wings went rather rapidly big day testing arrived slightly apprehensive spite previous disap pointments confidence calculations new wing section opposed having dealt total unknown before Fellow mem bers South Shore Radio Control Club witnessed some previous flights set witness another hairy-scary flight WW monster Only few knew wing change would have taken very astute knowledgeable fellow indeed detect dif ference between new old versions shorten story plane performed manner originally hoped would Take off climb-out majestically scale-like few times around checking various controls making slight aileron trim adjustment time see about landing set plane up landing approach cut throttle plane began nice low-angle glide still holding bit power flared plane settled nice gentle landing sour note graceful nose-over roll-out due premature release up elevator common error tail-draggers Subsequent flights made change after installation freshly broken-in Webra 91 place Profi 76 combination now complete dozens flights made configuration prepared entry plane Rhinebeck WW Jamboree plans show both true-scale altemate methods wing construction previously described Choose type combination construction best suits second plane example thats 3rd set wings am using scale ply built-up ribs spruce trailing edge retaining -in aluminum tubing tips have proven very satis factory Instead breaking wing tip minor accident tubing will often just bend can re-shaped quite readily As power recommendation feel 90-size engine must want compete AMA Precision Scale could get larger engines very nicelyas has proven STARS Quadra- Roper-powered stand-off models plane would require some modification firewall deepening cowl have several larger engines intend put original plane after completion second plane will use Precision Scale competition know plane can flown OS 80 Profi 76 90-size gives edge needed overcome large frontal area drag retaining margin reserve power emergency situations Best prop size has proven 16 4 4 5-in pitch Construction part rather straight forward areas have attempted duplicate original construction within normal modeling limits closely possible same time wanted plane transportable something less moving van plane has gone field times VW Rabbit often accompanied another plane two small size along required support systems As Scale plane small things seem take time adding greatest amount authenticity following guide will serve knowledgeable builder FUN SCALE IS HERE Easier Fly Yet Vety Maneuverable Over 20 step-by-step building illustrations easier follow photos Lands Uke Trainer Ideal 2nd TraIner Novice t9-25 Engine Write free Catatog JEMCO 1305 Foothill Dr Vista CA 92083 714 724-3242 96 Model Aviation WILL FLY AS SLOW AS PIPER CUB MODEL HOT STUFF WORLD CLASS ADHESIVES FOR EVERY MODELER oz $2251/2 oz $3952 oz $1200 saves 24 33% ORIGINALGAP FILLING HOT STUFF OR SUPER T AVAILABLE IN THE BEST HOBBY SHOPS WORLDWIDE PO BOX 836 SIMI CA 93062 522-0062 S495 19-40 Eng Span 51 ALL parts cut shapeArea 490 sq UnIque wing construction18-20 oz wing loading eliminates dihedral braces3*-4 lbs wing sheetingUpright Engine DesIgned Ironon coverings Can Built Flown 7 Days Due New Construction Techniques almost required information should noted photos accompanying text original plane have areas upgrading change during course building second plane since second plane completed written did include photos its construction order avoid confusion changes have incorporated plans construction details however descrepancies noted plans contain updated material relative improved authen ticity construction well attempting give better methods construction certain areas Using changes will result slightly favorable weight factor original marginally under AMA limit Precision Scale Fuselage First construct sides Use epoxy joints Laminate -in lite ply doublers inside fuselage side epoxy After carefully marking positions inside front doublers epoxy motor mount beams Cut two front rear cabane pieces using either shaped Proctor pieces make n spruce Mark position cabanes outside fuselage sides after cutting out piece upper -in spruce longeron accommodate epoxy cabanes position outside fuselage Use slowsetting epoxy carefully check alignment both sides identical Epoxy firewall F-2 through F-5 two wing seats place making sure squareness top view fuselage upside-down over top view cabanes hanging over edge workbench epoxy shaped stem post Add top formers F-6 through F- 11 along bottom pieces Add rear cross pieces 1/32-in ply stern plates top bottom Now add aft n spruce stringers short pieces -in spruce between F-6 F-7 Add n spruce inside n balsa top main fuselage longeron between F-5 F-6 Sand balsa piece shape formers Construct cylinder head air duct per draw ings may fitted installed now simply fitted installed permanently later time convenient Cut fit servo tray bearers Keep servos far forward possible right fuselage order clear cylinder head air duct Mount three servos rudder elevator ailerons Pro vide mount side air duct throttle servo Construct fit rudder bar aileron connector bellcrank An excellent base can made molded nylon bearings such used firewalls tricycle gears Bend landing gear wires 5/32-in tempered wire per detail plans Fabricate landing gear guide plate thin sheet steel brass piece -in OD copper tubing used form bottom U-shaped piece junction front rear landing gear wires guide plate conforms shape goes outside copper connector sure making up wire gear leave enough wire projecting Out lower bungee retainers best make too long cut off after having added copper washers copper tubing spacer piece Hold whole assembly alignment separate block wood Check dimensions silversolder parts well Dont forget add copper washers spacer bungee connectors Install landing gear blocks fuselage City fit add wire gear assembly Recheck alignment fasten place 3/16-in ply plates -in metal screws will allow easier removal later event landing gear bent front -in spruce stringers should now added Note front pieces splay out firewall edge Add small pieces scrap around point pieces meet firewall Install rear seat brace -in spruce between two 1/32-in ply plates outside fuselage Below mounted piece -in aluminum tubing inside piece outer Nyrod material bearing surface cables rudder elevator full-scale plane small pullies mounted wires builder may elect follow full-scale practice added effect alignment control wires would critical difficult Mount spruce blocks inside corners cabane accommodate anchors cabane side brace wires Sand contour adjoining formers F-2 F3 will covered over front ply covering time fix place inside cabane brace wire connections may small hook eyes some form convenient connection brace wires should quite strong As can seen rigging diagram wires cross point just above front covering placement can best ascertained running straight-edge top cabane brace point opposite inside fuselage will assure wires cross above covering point below Add outside -in spruce fairing strips firewall former 6 Taper sides Continued page 102 March 1981 97 STEELINS MODELS BUILDINS 3620 C StreetPliiladslpIla Pa 19134 C Catalog 01 entire line ot airplane Control line model kits P C Scale Trainer kits boat model kits accessories etc 50 encloSed E _ RUODERONLYFULSE AiAa4d44 suo LIGHT DIGITAL Th on,ble NOMAD thet ha SEND $2 FOR 9808 CA 00b trained thousands modalon w pniosalynranofaotttradby501221 NOMAD $1395ACE ii Inc hanaaadat ACEI u HOUSE OF BALSA ness Bolt ShE H GIl NSVC MO 0403 8 8584 2Z MAChthONE * GUI fl * PACCR * &ks dream e Gippy KEC ALPWA * dgC dream * GUOPY IISHAIKE firndo PROPELLERS polyester boll color Go GRISH No 1 propeller True helical pitch airfoil win-power 2 Blade Tractor 5-3each 5-4So 35o4Mc 6364SOc 747678Mc 848-68-8c 9-49-69-7 9810-4106needs 11411-6118i 12412-512-8ii 2 BladePusher YOUR DEALER 570-3 3 Blade Pusher Metallic Aluminum 8688 ia 5606104 er 06 $110 Put -in balsa strips just beneath shape same pieces will form point covering edge well permit inser tion pins side lacing Now add in balsa lower fairing strips between wing mounts back ply seat mount piece Add re balsa strips along cabanes sand taper top bottom Install shape pieces balsa block 1 sq abut 72 long firewall front wing mount key piece cowling shape use little time care shape somewhat apparent generally rounded tapered rearward extension firewall front ply covering may now added Approximate patterns shown plans make up patterns cardboard fit required before cutting parts 1/32-in GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes hance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6 8 & 10 PITCH 20 8 22 10 24 13 RIGHT HAND TRACTOR Os 6 RUSH ST JOHN INDIANA 46373 ply sheet will minor variances between model another Note slight lip formed edges ply covering Leave itdont sand off way full-scale made Construct install tail skid fittings pivot fitting made brass strip sheet Attach base fitting hardwood stem post using four small sheet metal screws fittings top bottom skid -in brass strip full-scale plane used bungee cord connect front skid upper side fuselage felt better use spring attachment avoid servicing otherwise would necessary Make up install control stick dummy pivot linkage visible below bottom fuselage found -in alumi num tubing best Use short piece rubber tubing control stick handle originally control stick hooked elevator linkage found caused periodic binding elevator desirable affliction dummied off simply ran wire lower end control stick around underseat bearing rod back upper connection stick simulated real controls made stick movable out interference actual controls Fair-in landing gear wires consists sandwich-type construction 1/16-in ply outer pieces 3/16-in balsa inner pieces Epoxy together landing gear wire forming leading edges should sanded round fore aft covering later wrap covering material diagonal striping pattern about p-in intervals per full-scale practice continued Radio Technique/Myers Continued page 23 Measure calculate Ill show A Downwash angle tail degrees Youll have guess about Its about 50 Downwash what causes plane pull itself out dive eventually enough room F An empirical function angle have developed wind tunnel tests Use following values calcula tions A-r-D1015202530 F 000046200005050000545 00005880000630 convert answer servo torque required simply multiply ratio servo wheel arm radius/control horn radius Actually due angles involved conversion requires bit geometry Since basing servo measurements 900 servo motion servo radius full UP 707 x radius measured wheel arm Likewise elevator deflection angle slightly reduces control horn working radius though effect small can usually neglected Therefore estimating purposes can say Sero Torque Required .Courrol Hinge Torque nOY0 Serre radius Conirol H&rnrIdiu Putting together equation STR 7Ll F in-oz U terms L, servo arm radius L2 control horn radius inches Sample Problem Curare elevator I Find dive speed Q Takeoff weight pounds full tank Projected cross-section areas gear retracted Fuselage Cylinder Head Header Tuned Pipe Propeller 170 26 24 15 45 280 squarc inchcs Q 28 pounds/square inch Vd\e 130 mph graph propeller stopped Note Dive speed can actually less equal greater value shown graph depending propeller pitch engine rpm Propeller stopped average sort answer 2 Find servo torque required 102 Model Aviation R EALIS NI SCALE ACCESSORIES WILLIAMS BROTHERS RADIO CONTROL SCALE PILOTS SCALE WHEELS CONTROL-LINECYLINDERS ENGINE KITS MACHINE GUN KITS FREE-FLIGHT STIC DISPLAY MODELS SEND $1 FOR COMPLETE ILLUSTRATED CATALOG DEPT MA 181 PAWNEE STREET SAN MARCOS CA 9 Sizes pitches styles NEWSIZE IN B& 10 PITCH 26 $16