Rubber Scale flight alive well Czechoslovakia P-51 H excellent example developmental end point Mustangs evolution its pretty lines larger wings tail H variant makes perfect modeling subject its characteristi cally dependable stable flight thank Bill Warner help getting publishable state ELubomir Koutny About author Lubomir Koutny known throughout world modeling community accomplished designers fliers anywhere has years experience fields rubber-powered aircraft Today Czechoslovakia Peanut Scale A0-scale rage lat ter being mostly planes World War II due clean configurations high per formance potential P-SJH finest all-around Rubber Scale models 1A0 class representative fine work being done today Czechoslo vakia THE FINAL production variant leg endary Mustang fighter P-51H also fastest line World War II aircraft Although came along too late take part European operations few did see action against Japan closing days war As modeling subject de velopmental end point Mustang fighter series has distinct advantages over P-5 1 D larger tail simplified under76 Model Aviation Big picture Mr Koutny has built several P-51H models various sizes structural tech niques plane pictured original model plan depicts built 1980 o scale model has wingspan 570mm weighs 48 grams version has re corded up 70-second flights Above author seen displaying original P-51H Full-Size Plans Available Page 196 O 110 MB BALSA SPARz o MB BALSA SPARE7H5 MM BALSA CE TAPERS TO 23MMTAPERS TO 213 MBTAPERS TO 4R MUSUM BALSA SHEET DUB BALSA 1 TIP ~ .jWIGAN PAP H AILERON PAPER TABESLIART ACETATE HOE Er2 ES MU PAPERTAILAREEL APTIOBAR 15 BB BALSA SHEET2B MBft-- ABOAET E ABOVE 00 IIRIB IIII CE FRAUTE PROW PATTERS FOR DARTISS AlSO RBS BARE PROW PO CE EROB BELOW t015 BM BALSA TE EROB K. Ff7 RftBB BALSASTABlERLINES BR BALSAOREET B 65w 7 FORBERS 2 TRW B 7 THRA ARE MB BALSA SHEET S H S ARE 2MM IBM C GROOR25MMRIO BAMBOO PROP BLADE -POWER2 LOAPS OF BOBBER 700 MM IORILHNG TORUS AOA EHRAOST PORTSPLIGHT TIRE70 SECOURS REISUTAOS MODEL AVIATION HISS TOP B BOTTOMMUSTANG P 51 H BAUD PAPERI/DO SCALE RUBBER POWERED 5B RBCOLAP SCKERAE OVERALL SILOER-AREY BLADE PROPDESIGNED BY LOBOMIR KOVYNY B5S11TBFUSELAGEFRONTBLADES SCARE PASELDRAWN BY PETR MIIGULASEK O3B2EPEGROUSE TRIM AS SHORS________________________________ PAPERTRACING VIEW0 EM AR CO YROREBY carriage smaller wheels lowdrag wing An excellent model P-51H has flown successfully Czech modelers other A0-scale ships confined model box due bad winds Though its recommended begin ners constructing warbird wont too difficult have built few Scale models Choosing right balsa light strong using light glue will result flying weight exceeding 50 grams model has wingspan 22 3/4 should translate favorably light wing loading Wing ribs made A2 C-grain balsa sheet Use stacking method wish procedure root rib tip rib made hard material placed opposite sides stack A2 blanks held together couple pins Planing sanding down until match either end produces evenly tapered sizes between blanks will require minor finishing before installation Slots two top two bottom spars /6-sq hard balsa can sanded stack still joined Note notch sanded rib attach ment point trailing edge plan An easier lighter wing construction method sliced rib technique shown plan After making pattern thin plywood plastic aluminum sheet shown slice both upper lower por tions rib /16 sheet trim indicated lengths Note lower surface wing flat Block up rear rib little trailing edge will follow downward curve attached leading edge tapered will above building board due upward curve front rib Wash out recommended can built raising wing tip bit trailing edge during construction stable glide can accomplished slimming down airfoil right wing slightly choice dihedral angle deter mined youre going fly mod el flying wheels-down indoors will require little dihedral shown An outdoor model flown gear up should have 1% l4 dihedral Fuselage An on-the-half-shell construc October 1989 77 Pictured its bare bones Mr Koutnys latest version line Mustangs air plane has sheeted fuselage front strength realism wing spars built up sliced-rib construction used ribs well stabilizer tar weight reduction tion method used Pin down upper lower /16 sheet keels cut A2 sheet bulkheads half vertically cement left side halves place perpendicular plan locations shown left side outline keel cut /16 sheet glued allowed dry Remove left-half fuselage assembly board install right halves bulkheads Add right side outline keel piece basic fuselage ready receive stringers stringers sliced strong medium-weight balsa Soft material will al low stringers pull between bulk heads giving starved-horse effect Use A0 sheet slice stringers follow ing curve fuselage best re sults tapering A0-sq nose A0 x A2 tail save weight stringers glued top bulk head formers rather fitted notches quite closely spaced about /6 give fuller realistic look still retaining lightness Standard straight stringers used tend distort fuselage Dont add bottom stringers until after wings attached radiator block carved very light balsa installed after model has covered front end fuselage can sheeted extra realism strength shown latest version model Tail Use lightest strongest balsa can find Pin wood down plastic wrap avoid its sticking plan Note airfoil sanded top stabilizer tail surfaces may also made /16 sheet desired Undercarriage Make landing gear de tachable plugging built-in paper tubes wing model looks flies better gear dangling down Make wheels soft balsa Styro foam small rolled-paper tubes through centers axle bearings Propeller Cut four blades strong Cgrain %2 sheet Glue bamboo axes Sand airfoil section Clark Y twist blades using hot iron can also made three laminations /32 sheet formed over molding block Finish blades nitrate dope Czechoslovaki modelers find spray used shoe re pairing does excellent job use poly styrene around wire hook prop shaft 2 Take care carving nose block spinner assembly ensure good fit Make sure paper tube blade inserts stalled straight keep blades wob bling Dont glue bamboo blade stubs solidly until after flight testing has fin ished3 Note circular plywood ramp freewheeling inside spinner should 1 0 right 20 left downthrust built nose block Covering Use either Japanese tissue lightness lightest grade Modelspan greater realism Japanese Sakai silver tis sue works well Cover model carefully finish well-thinned nitrate dope Finishing solid color such Humbrol line adds weight also enhances realism should applied sparingly airbrush Remember silver finish accentuates construction 78 Model Aviation Mr Koutny isnt building rubber-powered P-51H Mus tangs Czechoslovakia left Radek Koval shows off P 51H featuring solid rib construction all-sheet tail surface airplane dates back 1973 Above P-51J variant built Ivo Ceresnak 1975 Note different cockpit exhaust stack configuration flew well despite its heavy sprayed-silver paint job Continued page 176 Details propeller nose block hook landing gear undercarriage legs con structed bamboo epoxied aluminum yoke Styrofoam wheels landing gear legs plug paper tubes built wings order facilitate removal flying prop blades plug paper tubes built spinner bamboo stems may have adlusted get best flight performance before being permanently glued place close up nose block/spinner shows Czech hook encased trans parent plastic Its purpose may best de scribed Mr Koutnys own words Make Czech hook axis polystyrene better opposite some cordon needed perfect rubber prop work ing Its left reader figure out r Mystery Products little-known facts about two well-known products should help take mystery out modeling projects FLEXA Ideal non-porous materials fiber glass Use sparingly plywood fiberglass dont use Zip-Kicker Results tremendous bonding power just wont vibrate loose no stronger formula available anywhere POLS ZATh Adheres plastic surface including Lexan other modern plastics Also glue canopies fogging Use couple drops just little Zip-Kickertm esellent results HE ~CY- / ADHESIVE SYsTEM POce Tech Californd USA backyard fence since repaired it ready again test under power felt go Wright Field contest get some experience already pre-entered NFFS/US Outdoor Champs held couple weeks Lawrenceville IL son-in-law arrived contest site about 1100 am. now decided going watch ran old friend Harry Murphy made go get plane said would probably would fly introduced some flying friends looked over plane commented about several strange novations said plane appeared legal flightworthy -Although extremely nervous did some thing irrational decided fly plane suggested put prop backwards some technical reasons did Harry helped get DT fuse correctly align tail section After having some trouble engine fi nally started Now really nervous un hooked battery got ready launch Zeek mind blank tossed plane air took off low half-circle right other contestants finally climbed little surprise gained altitude fast -As proudly watched fly several sec onds Harry asked set timer No Did light DT fuse No Meanwhile Zeek proudly roared higher higher way Harry commented large fuel tank thoughtfully filled very top Now Harry also panicked jumped motorbike told get car drive around outside field quickly headed downwind south took about 10 minutes get outside base around downwind fence get parked start looking plane spotted Harry riding towards motorbike stopped temporarily stuck something finally got going again rode up fence noticed gotten mud over pants told plane OK gotten stuck mud plane run out gas stalled badly came down pretty quickly got lost going back ended up taking lap around base About 15 minutes later got back plane OK Harry going have cleanine bill Harry said planes CO right move forward already holes got out tools moved engine ward about half-inch ready fly again Also Harry gave bigger prop stalled backwards another test flight think Harry may have lost some confidence because suggested move away cars little bit Several guys made sug gestions about launch wind light fuse start timer guy said seen guys forget otherbut both engine started lot quicker time tried light fuse wind off prop blew out lighter thought heck set timer away went upwind did couple twists timer shut engine off made few circles glide made nice three-point landing about quarter mile away Harry asked about fuse ex plained did work Another lesson gave piece clothesline rope keep burning light DT fuse can blow out ready flight number three put prop right way power set timer longer engine run started engine lit fuse let Zeek go noticed wind changed set off downwind again went pretty well again DT did work circled around headed other fliers Everyone started duck ing made another three-point landing middle contestants area No hurt ready flight four did everything right time flew greatstraight up high timer shut off 10 seconds Zeek circled down glided perfectly landed about 300 ards away DTd about six feet off ground shorten fuse ready flight five flight super flew high fast staying up forever praying OT pop up Shortly thereafter did pop Zeek fell gently ground made day guys congratulated good plane good flight felt like Free Flighter packed up called day watched Harry fly Pee Wee 30 brand-new some problems after two flights made some adjustments called timer got maximum flight thought would never come down get bike go about quarter-mile get Success could leave well enough alone Now expert decided make another flight did everything right sent up rolled over powered ground broken wing tip some nose damage resulted Well back reality guys said got initia tion got feet wet welcomed club wished good luck packed up quite confident before lot smarter experienced few hours earlier am looking forward next contest headed home 53-year-old Free Flight rookie Les Hallgarth June 4 1989 says doesnt thats about time See ya downwind P-51 B/Koutny Con finued page 78 flaws Though P-51H has flown racer boys prefer build warbird Cockpit panel drawn photocopied instruments pilot radio can added extra realism canopy can made thin 03mm acetate sheet heated frame before pressing shaped cockpit mold Flight trimming Check wing washout adjust necessary original model trimmed fly left-left re quired about s up elevator4 rudder bent slightly left As model turn ing left left wing should have little less washout right order crease its lift slightly Make sure thrust line 20 40 down 10 right Rubber original model flown vintage 1972 Pirelli subsequent edi tions have flown successfully Alfa Continued page 178 176 Model Aviation Stack f Immediate Slat paaaent ZEMOAH G-62 37 Cu In $26495 ZENOAN G-23 96 ZENOAM 038 $17896 SACHI 28 TCA 838000 SACHS 32 TCA 50 SACHS 37 CDI 00 SACIlS 37 TCA 00 SACHS 58 CDI 00 SACHO 58 TCA 00 JOo Me. ERCOUPEPLANS 02386 FULL KIT $23881 Jin Meaer TOMAHAWKPLANS $2386 FULL KIT 023888 Jim Meoser J3 KITTENPLANS $2886 FULL KIT $21886 FLORIO FLYER NIFTY-SO kit$9286 FLORIC FLYER40 kit 07186FF 80 kit 6 SUPER-FLEX Goline tobino /ft 38/0160050/03800 FLOATS 48114 stalenore $3186 complet kit $4786 10 WW1 WHEELS 6P1K Spring Starter 02486 PLANS supos STEARMAN lIdlGodfrey/$3886 1I3TAYLORCRAFTor1I3CuB NeIIU03881 MGA Painted Pilot Boats 1/4 so. WW1 WV12 Cit$1886 Servos H-402 42 $1295 World 518 leg. nodel $4486 Prop 11 since ER TOP FLITE OYNATHRUST 30% off US Osedro FUELTANKS180. $78633 0886 FIBERGLASS ARROW SHAFTS 6/18023 long 6 $1186 24 Hr Sorvios $286 p000g 80k Cheok MO JIM MESSERS QUALITY MODEL PRODUCTS Valley View Drive Box 43 AlIegany NY 14706 Recoil Tubing XL same design original Recoil Tubing now Incorporated longer tube New Fourmost Recoil Tubin XL six foot length super tough fuel proof urethane tubing preformed SIX Inch coil After use tubin will retract its original spacesaving form out soil out way Recoil Tubing XL may used gasoline diesel well glow fuel Price $550 No 135 Size 1/8 lD FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 attached fuel can allows placement field box fuel can convenient distance aircraft boat Almost Ready Fly. Requires few hours assembly. Includes necessary accessories/hardware sa construction precovered 20-25 Size CHEROKEE 48 wing span Special -45 Size SHARP 40 Size now available 9858 Foam core Shea edWng Buy 2 more. PO Box 3634 Cerritos CA 907033634The Red Arrow 213 946-127020 Size 95COO Money Orders 40 Size 95Checks Accepted allow 7 addItional dayel A-4SkyhawkF20 Tgerehark 34 wingspan36 oingnpao 400 no 0. ares330 nq 38 lengnh38 leopth $4500 0 $300 S/H$4800 4 8300 S/il Want go vertica1 tOniJet Series Ai Skohauk sod P20 Tige shark nih allon jetlike pen ornonce nO ti ost hassle nhe ducted Bho orrheexpenn Both kits balsa construtnios sprice spar sings p can act osnod Standard servo 4 channel radi o systens accept 20 28 nine enginen eatepnhona petf ornasce use t 21 25 teStes haust engines Ai sneesh core docile loser npre dn kitn ore th einter nediste PArer Ae suer plans nod canopien nh ose sho nish scratch hoild $1300 Plans Canopy $1000 Plans ocly Other products anailahlr Fuel InjettiOo frens Fans Bats Aleard Pipes Innonatine yodel Pro 05cm WAIl hits Plans Sendcheck Money Order coDadd$3 FLResadd6% salestax 305 581-4477 PARRISH AIRCRAFT& Scale Models ll25SW4SthTer Plantation FL33317 Romeo rubber poorquality Filati times between 60 75 seconds dead air big prop helps keep model flying away Straight castor oil used lubricant using Sig contest rubber FAI rubber might start three loops 3mm %2 about 28 long5 great deal depends models weight pitch its propeller blades Flying Check balance point make sure center-of-gravity shown plan line front cockpit isnt correct add weight nose tail bring airplane balance Try test glide high grass aiming nose slightly downward well model should glide about 12 yards straight line gentle left turn stalls dives check rubber position see its bunching up shifting center-of-gravity Give rubber about 250 turns maiden flight model should fly gently leftward perhaps climb little stalls nose goes up too much under power falls put little downthrust adding thin shim between top nose block nose flight satisfactory boost power 500 turns model should climb left glide left climbs first half circle de scends second half add wash out right wing additional test glides Once glide acceptable can move up 800 1000 turns fly big torque moment airplane should climb easily over 150-ft altitude Make minor corrections between flights never attempt adjustment time P-51H excellent flier will give consistent results invite write questions comments Ing Lubomir Koutny Zahrebska 33 61600 Brno Czechoslovakia Good luck competent dependable Scale model reader preparing above text faced problem conveying Mr Koutnys words well could Al though English infinitely better 178 Model Aviation THE PIPER BRAVE e 1/4 scale model Piper s latest Ag plane e 10 ft wing span e 30-33 lbs e 50-75 cc power e 5-10 lb payload e Operational flaps hopper door e Optional Spreader Kit e Pre-formed aluminum landing gear e Fiberglass cowls Vacuum-formed canopy e Constucted extruded foam ply hardwood e smoker l ISBRAVE $269~OPTIONAL SEND $100 FOR CATALOG OFQ 4/7RT 1 NEODESHA KS 66757 SAC KITS AND ACCESSORIES316 325-2821 Free Shipping Kit OrdersScott Airplane CompanyVISA/MASTERCARD Czech much will less crystal-clear average modeler apol ogize verbal inadequacies urge builder carefully examine model photos plan help clarify things may also write Mr Koutny ques tions tell him about model Bill Warner Footnotes following notes pre sented Mr Koutnys exact words al low various interpretations better gliding stability good right half wing tip has some slimmer aerofoil opposite left 2 Make Czech hook axis poly styrene better opposite some cor don needed perfect rubber prop working pattern correct blade angles adjustment pitch 0160mm 350mm good elevator has little twist 2mm enough 5Engine 12g FAI rubber 6 x /24 x %2 flight undercarriage 8 x A4 x Y32 ROG CL Scale/Boss Continued page 79 touch-and-go taxi lap retract extend landing gear Because flight portion event counts half total score importance choos ing model good flying characteristics will readily apparent course capability experience person holding control han dle play large part success failure model flight key word pracrice point might worthwhile inject extra thought flight portion event Much has said past about military fighter multiengine models having advan tage over less sophisticated civilian-type air craft during flight portion competition dont think thats entirely true because aircraft basically simple de signs yet compete effectively against phisticated types simplest subjects judged four obligatory maneuvers finding maneu vers fill out six optional selections can chosen options listed AMA FAI Scale rules should present little difficulty Most models capable taxiing two options performing touch-and-go two options engine control engine cutoff option Thats five six options needed last option could depending subject modeled operation wing flaps crop dusting other similar maneuver summary should choose model can documented both Accuracy Outline Finish Color Markings has neces sary features options filling out flight plan has good flight characteristics youre careful selecting subject gath ering data youre able fill out flight plan well learn flight characteris tics model youll rewarded K NARROW BAID V SITS A9 84Computer Ingenuity Intended serious flyer PCM 9 offers few compromises wfth some novative features have changed standards radio systems will judged transmftter hasthe lookandfeelofahigh performance no nonsense piece equipment control sticks supported two ball bearings axis ot movement adjustable length Frequencies can quickly changed swapping modules servo direction travel adjustable nine channels direct servo controller allows operation radio ground someone else uses same frequency Both pattern helicopter versions have programmable fail safe systems use 1991 ready PCM ABC&W receivers Both versions come wTh four 4001 servos rechargeable transmitter airborne batteries full servo mounting hardware swch harness Available now through ic,flJllCSw local hobby dealer yesterdays prices Distributed Hobby Dynamics Distributors e 1-800-458-0241 PO Box 3726 Champaign IL 61826-3 72 6 1-217-355-0058 October 1989 179 Analog Flexibility
Edition: Model Aviation - 1989/10
Page Numbers: 76, 77, 78, 176, 178, 179
Rubber Scale flight alive well Czechoslovakia P-51 H excellent example developmental end point Mustangs evolution its pretty lines larger wings tail H variant makes perfect modeling subject its characteristi cally dependable stable flight thank Bill Warner help getting publishable state ELubomir Koutny About author Lubomir Koutny known throughout world modeling community accomplished designers fliers anywhere has years experience fields rubber-powered aircraft Today Czechoslovakia Peanut Scale A0-scale rage lat ter being mostly planes World War II due clean configurations high per formance potential P-SJH finest all-around Rubber Scale models 1A0 class representative fine work being done today Czechoslo vakia THE FINAL production variant leg endary Mustang fighter P-51H also fastest line World War II aircraft Although came along too late take part European operations few did see action against Japan closing days war As modeling subject de velopmental end point Mustang fighter series has distinct advantages over P-5 1 D larger tail simplified under76 Model Aviation Big picture Mr Koutny has built several P-51H models various sizes structural tech niques plane pictured original model plan depicts built 1980 o scale model has wingspan 570mm weighs 48 grams version has re corded up 70-second flights Above author seen displaying original P-51H Full-Size Plans Available Page 196 O 110 MB BALSA SPARz o MB BALSA SPARE7H5 MM BALSA CE TAPERS TO 23MMTAPERS TO 213 MBTAPERS TO 4R MUSUM BALSA SHEET DUB BALSA 1 TIP ~ .jWIGAN PAP H AILERON PAPER TABESLIART ACETATE HOE Er2 ES MU PAPERTAILAREEL APTIOBAR 15 BB BALSA SHEET2B MBft-- ABOAET E ABOVE 00 IIRIB IIII CE FRAUTE PROW PATTERS FOR DARTISS AlSO RBS BARE PROW PO CE EROB BELOW t015 BM BALSA TE EROB K. Ff7 RftBB BALSASTABlERLINES BR BALSAOREET B 65w 7 FORBERS 2 TRW B 7 THRA ARE MB BALSA SHEET S H S ARE 2MM IBM C GROOR25MMRIO BAMBOO PROP BLADE -POWER2 LOAPS OF BOBBER 700 MM IORILHNG TORUS AOA EHRAOST PORTSPLIGHT TIRE70 SECOURS REISUTAOS MODEL AVIATION HISS TOP B BOTTOMMUSTANG P 51 H BAUD PAPERI/DO SCALE RUBBER POWERED 5B RBCOLAP SCKERAE OVERALL SILOER-AREY BLADE PROPDESIGNED BY LOBOMIR KOVYNY B5S11TBFUSELAGEFRONTBLADES SCARE PASELDRAWN BY PETR MIIGULASEK O3B2EPEGROUSE TRIM AS SHORS________________________________ PAPERTRACING VIEW0 EM AR CO YROREBY carriage smaller wheels lowdrag wing An excellent model P-51H has flown successfully Czech modelers other A0-scale ships confined model box due bad winds Though its recommended begin ners constructing warbird wont too difficult have built few Scale models Choosing right balsa light strong using light glue will result flying weight exceeding 50 grams model has wingspan 22 3/4 should translate favorably light wing loading Wing ribs made A2 C-grain balsa sheet Use stacking method wish procedure root rib tip rib made hard material placed opposite sides stack A2 blanks held together couple pins Planing sanding down until match either end produces evenly tapered sizes between blanks will require minor finishing before installation Slots two top two bottom spars /6-sq hard balsa can sanded stack still joined Note notch sanded rib attach ment point trailing edge plan An easier lighter wing construction method sliced rib technique shown plan After making pattern thin plywood plastic aluminum sheet shown slice both upper lower por tions rib /16 sheet trim indicated lengths Note lower surface wing flat Block up rear rib little trailing edge will follow downward curve attached leading edge tapered will above building board due upward curve front rib Wash out recommended can built raising wing tip bit trailing edge during construction stable glide can accomplished slimming down airfoil right wing slightly choice dihedral angle deter mined youre going fly mod el flying wheels-down indoors will require little dihedral shown An outdoor model flown gear up should have 1% l4 dihedral Fuselage An on-the-half-shell construc October 1989 77 Pictured its bare bones Mr Koutnys latest version line Mustangs air plane has sheeted fuselage front strength realism wing spars built up sliced-rib construction used ribs well stabilizer tar weight reduction tion method used Pin down upper lower /16 sheet keels cut A2 sheet bulkheads half vertically cement left side halves place perpendicular plan locations shown left side outline keel cut /16 sheet glued allowed dry Remove left-half fuselage assembly board install right halves bulkheads Add right side outline keel piece basic fuselage ready receive stringers stringers sliced strong medium-weight balsa Soft material will al low stringers pull between bulk heads giving starved-horse effect Use A0 sheet slice stringers follow ing curve fuselage best re sults tapering A0-sq nose A0 x A2 tail save weight stringers glued top bulk head formers rather fitted notches quite closely spaced about /6 give fuller realistic look still retaining lightness Standard straight stringers used tend distort fuselage Dont add bottom stringers until after wings attached radiator block carved very light balsa installed after model has covered front end fuselage can sheeted extra realism strength shown latest version model Tail Use lightest strongest balsa can find Pin wood down plastic wrap avoid its sticking plan Note airfoil sanded top stabilizer tail surfaces may also made /16 sheet desired Undercarriage Make landing gear de tachable plugging built-in paper tubes wing model looks flies better gear dangling down Make wheels soft balsa Styro foam small rolled-paper tubes through centers axle bearings Propeller Cut four blades strong Cgrain %2 sheet Glue bamboo axes Sand airfoil section Clark Y twist blades using hot iron can also made three laminations /32 sheet formed over molding block Finish blades nitrate dope Czechoslovaki modelers find spray used shoe re pairing does excellent job use poly styrene around wire hook prop shaft 2 Take care carving nose block spinner assembly ensure good fit Make sure paper tube blade inserts stalled straight keep blades wob bling Dont glue bamboo blade stubs solidly until after flight testing has fin ished3 Note circular plywood ramp freewheeling inside spinner should 1 0 right 20 left downthrust built nose block Covering Use either Japanese tissue lightness lightest grade Modelspan greater realism Japanese Sakai silver tis sue works well Cover model carefully finish well-thinned nitrate dope Finishing solid color such Humbrol line adds weight also enhances realism should applied sparingly airbrush Remember silver finish accentuates construction 78 Model Aviation Mr Koutny isnt building rubber-powered P-51H Mus tangs Czechoslovakia left Radek Koval shows off P 51H featuring solid rib construction all-sheet tail surface airplane dates back 1973 Above P-51J variant built Ivo Ceresnak 1975 Note different cockpit exhaust stack configuration flew well despite its heavy sprayed-silver paint job Continued page 176 Details propeller nose block hook landing gear undercarriage legs con structed bamboo epoxied aluminum yoke Styrofoam wheels landing gear legs plug paper tubes built wings order facilitate removal flying prop blades plug paper tubes built spinner bamboo stems may have adlusted get best flight performance before being permanently glued place close up nose block/spinner shows Czech hook encased trans parent plastic Its purpose may best de scribed Mr Koutnys own words Make Czech hook axis polystyrene better opposite some cordon needed perfect rubber prop work ing Its left reader figure out r Mystery Products little-known facts about two well-known products should help take mystery out modeling projects FLEXA Ideal non-porous materials fiber glass Use sparingly plywood fiberglass dont use Zip-Kicker Results tremendous bonding power just wont vibrate loose no stronger formula available anywhere POLS ZATh Adheres plastic surface including Lexan other modern plastics Also glue canopies fogging Use couple drops just little Zip-Kickertm esellent results HE ~CY- / ADHESIVE SYsTEM POce Tech Californd USA backyard fence since repaired it ready again test under power felt go Wright Field contest get some experience already pre-entered NFFS/US Outdoor Champs held couple weeks Lawrenceville IL son-in-law arrived contest site about 1100 am. now decided going watch ran old friend Harry Murphy made go get plane said would probably would fly introduced some flying friends looked over plane commented about several strange novations said plane appeared legal flightworthy -Although extremely nervous did some thing irrational decided fly plane suggested put prop backwards some technical reasons did Harry helped get DT fuse correctly align tail section After having some trouble engine fi nally started Now really nervous un hooked battery got ready launch Zeek mind blank tossed plane air took off low half-circle right other contestants finally climbed little surprise gained altitude fast -As proudly watched fly several sec onds Harry asked set timer No Did light DT fuse No Meanwhile Zeek proudly roared higher higher way Harry commented large fuel tank thoughtfully filled very top Now Harry also panicked jumped motorbike told get car drive around outside field quickly headed downwind south took about 10 minutes get outside base around downwind fence get parked start looking plane spotted Harry riding towards motorbike stopped temporarily stuck something finally got going again rode up fence noticed gotten mud over pants told plane OK gotten stuck mud plane run out gas stalled badly came down pretty quickly got lost going back ended up taking lap around base About 15 minutes later got back plane OK Harry going have cleanine bill Harry said planes CO right move forward already holes got out tools moved engine ward about half-inch ready fly again Also Harry gave bigger prop stalled backwards another test flight think Harry may have lost some confidence because suggested move away cars little bit Several guys made sug gestions about launch wind light fuse start timer guy said seen guys forget otherbut both engine started lot quicker time tried light fuse wind off prop blew out lighter thought heck set timer away went upwind did couple twists timer shut engine off made few circles glide made nice three-point landing about quarter mile away Harry asked about fuse ex plained did work Another lesson gave piece clothesline rope keep burning light DT fuse can blow out ready flight number three put prop right way power set timer longer engine run started engine lit fuse let Zeek go noticed wind changed set off downwind again went pretty well again DT did work circled around headed other fliers Everyone started duck ing made another three-point landing middle contestants area No hurt ready flight four did everything right time flew greatstraight up high timer shut off 10 seconds Zeek circled down glided perfectly landed about 300 ards away DTd about six feet off ground shorten fuse ready flight five flight super flew high fast staying up forever praying OT pop up Shortly thereafter did pop Zeek fell gently ground made day guys congratulated good plane good flight felt like Free Flighter packed up called day watched Harry fly Pee Wee 30 brand-new some problems after two flights made some adjustments called timer got maximum flight thought would never come down get bike go about quarter-mile get Success could leave well enough alone Now expert decided make another flight did everything right sent up rolled over powered ground broken wing tip some nose damage resulted Well back reality guys said got initia tion got feet wet welcomed club wished good luck packed up quite confident before lot smarter experienced few hours earlier am looking forward next contest headed home 53-year-old Free Flight rookie Les Hallgarth June 4 1989 says doesnt thats about time See ya downwind P-51 B/Koutny Con finued page 78 flaws Though P-51H has flown racer boys prefer build warbird Cockpit panel drawn photocopied instruments pilot radio can added extra realism canopy can made thin 03mm acetate sheet heated frame before pressing shaped cockpit mold Flight trimming Check wing washout adjust necessary original model trimmed fly left-left re quired about s up elevator4 rudder bent slightly left As model turn ing left left wing should have little less washout right order crease its lift slightly Make sure thrust line 20 40 down 10 right Rubber original model flown vintage 1972 Pirelli subsequent edi tions have flown successfully Alfa Continued page 178 176 Model Aviation Stack f Immediate Slat paaaent ZEMOAH G-62 37 Cu In $26495 ZENOAN G-23 96 ZENOAM 038 $17896 SACHI 28 TCA 838000 SACHS 32 TCA 50 SACHS 37 CDI 00 SACIlS 37 TCA 00 SACHS 58 CDI 00 SACHO 58 TCA 00 JOo Me. ERCOUPEPLANS 02386 FULL KIT $23881 Jin Meaer TOMAHAWKPLANS $2386 FULL KIT 023888 Jim Meoser J3 KITTENPLANS $2886 FULL KIT $21886 FLORIO FLYER NIFTY-SO kit$9286 FLORIC FLYER40 kit 07186FF 80 kit 6 SUPER-FLEX Goline tobino /ft 38/0160050/03800 FLOATS 48114 stalenore $3186 complet kit $4786 10 WW1 WHEELS 6P1K Spring Starter 02486 PLANS supos STEARMAN lIdlGodfrey/$3886 1I3TAYLORCRAFTor1I3CuB NeIIU03881 MGA Painted Pilot Boats 1/4 so. WW1 WV12 Cit$1886 Servos H-402 42 $1295 World 518 leg. nodel $4486 Prop 11 since ER TOP FLITE OYNATHRUST 30% off US Osedro FUELTANKS180. $78633 0886 FIBERGLASS ARROW SHAFTS 6/18023 long 6 $1186 24 Hr Sorvios $286 p000g 80k Cheok MO JIM MESSERS QUALITY MODEL PRODUCTS Valley View Drive Box 43 AlIegany NY 14706 Recoil Tubing XL same design original Recoil Tubing now Incorporated longer tube New Fourmost Recoil Tubin XL six foot length super tough fuel proof urethane tubing preformed SIX Inch coil After use tubin will retract its original spacesaving form out soil out way Recoil Tubing XL may used gasoline diesel well glow fuel Price $550 No 135 Size 1/8 lD FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 attached fuel can allows placement field box fuel can convenient distance aircraft boat Almost Ready Fly. Requires few hours assembly. Includes necessary accessories/hardware sa construction precovered 20-25 Size CHEROKEE 48 wing span Special -45 Size SHARP 40 Size now available 9858 Foam core Shea edWng Buy 2 more. PO Box 3634 Cerritos CA 907033634The Red Arrow 213 946-127020 Size 95COO Money Orders 40 Size 95Checks Accepted allow 7 addItional dayel A-4SkyhawkF20 Tgerehark 34 wingspan36 oingnpao 400 no 0. ares330 nq 38 lengnh38 leopth $4500 0 $300 S/H$4800 4 8300 S/il Want go vertica1 tOniJet Series Ai Skohauk sod P20 Tige shark nih allon jetlike pen ornonce nO ti ost hassle nhe ducted Bho orrheexpenn Both kits balsa construtnios sprice spar sings p can act osnod Standard servo 4 channel radi o systens accept 20 28 nine enginen eatepnhona petf ornasce use t 21 25 teStes haust engines Ai sneesh core docile loser npre dn kitn ore th einter nediste PArer Ae suer plans nod canopien nh ose sho nish scratch hoild $1300 Plans Canopy $1000 Plans ocly Other products anailahlr Fuel InjettiOo frens Fans Bats Aleard Pipes Innonatine yodel Pro 05cm WAIl hits Plans Sendcheck Money Order coDadd$3 FLResadd6% salestax 305 581-4477 PARRISH AIRCRAFT& Scale Models ll25SW4SthTer Plantation FL33317 Romeo rubber poorquality Filati times between 60 75 seconds dead air big prop helps keep model flying away Straight castor oil used lubricant using Sig contest rubber FAI rubber might start three loops 3mm %2 about 28 long5 great deal depends models weight pitch its propeller blades Flying Check balance point make sure center-of-gravity shown plan line front cockpit isnt correct add weight nose tail bring airplane balance Try test glide high grass aiming nose slightly downward well model should glide about 12 yards straight line gentle left turn stalls dives check rubber position see its bunching up shifting center-of-gravity Give rubber about 250 turns maiden flight model should fly gently leftward perhaps climb little stalls nose goes up too much under power falls put little downthrust adding thin shim between top nose block nose flight satisfactory boost power 500 turns model should climb left glide left climbs first half circle de scends second half add wash out right wing additional test glides Once glide acceptable can move up 800 1000 turns fly big torque moment airplane should climb easily over 150-ft altitude Make minor corrections between flights never attempt adjustment time P-51H excellent flier will give consistent results invite write questions comments Ing Lubomir Koutny Zahrebska 33 61600 Brno Czechoslovakia Good luck competent dependable Scale model reader preparing above text faced problem conveying Mr Koutnys words well could Al though English infinitely better 178 Model Aviation THE PIPER BRAVE e 1/4 scale model Piper s latest Ag plane e 10 ft wing span e 30-33 lbs e 50-75 cc power e 5-10 lb payload e Operational flaps hopper door e Optional Spreader Kit e Pre-formed aluminum landing gear e Fiberglass cowls Vacuum-formed canopy e Constucted extruded foam ply hardwood e smoker l ISBRAVE $269~OPTIONAL SEND $100 FOR CATALOG OFQ 4/7RT 1 NEODESHA KS 66757 SAC KITS AND ACCESSORIES316 325-2821 Free Shipping Kit OrdersScott Airplane CompanyVISA/MASTERCARD Czech much will less crystal-clear average modeler apol ogize verbal inadequacies urge builder carefully examine model photos plan help clarify things may also write Mr Koutny ques tions tell him about model Bill Warner Footnotes following notes pre sented Mr Koutnys exact words al low various interpretations better gliding stability good right half wing tip has some slimmer aerofoil opposite left 2 Make Czech hook axis poly styrene better opposite some cor don needed perfect rubber prop working pattern correct blade angles adjustment pitch 0160mm 350mm good elevator has little twist 2mm enough 5Engine 12g FAI rubber 6 x /24 x %2 flight undercarriage 8 x A4 x Y32 ROG CL Scale/Boss Continued page 79 touch-and-go taxi lap retract extend landing gear Because flight portion event counts half total score importance choos ing model good flying characteristics will readily apparent course capability experience person holding control han dle play large part success failure model flight key word pracrice point might worthwhile inject extra thought flight portion event Much has said past about military fighter multiengine models having advan tage over less sophisticated civilian-type air craft during flight portion competition dont think thats entirely true because aircraft basically simple de signs yet compete effectively against phisticated types simplest subjects judged four obligatory maneuvers finding maneu vers fill out six optional selections can chosen options listed AMA FAI Scale rules should present little difficulty Most models capable taxiing two options performing touch-and-go two options engine control engine cutoff option Thats five six options needed last option could depending subject modeled operation wing flaps crop dusting other similar maneuver summary should choose model can documented both Accuracy Outline Finish Color Markings has neces sary features options filling out flight plan has good flight characteristics youre careful selecting subject gath ering data youre able fill out flight plan well learn flight characteris tics model youll rewarded K NARROW BAID V SITS A9 84Computer Ingenuity Intended serious flyer PCM 9 offers few compromises wfth some novative features have changed standards radio systems will judged transmftter hasthe lookandfeelofahigh performance no nonsense piece equipment control sticks supported two ball bearings axis ot movement adjustable length Frequencies can quickly changed swapping modules servo direction travel adjustable nine channels direct servo controller allows operation radio ground someone else uses same frequency Both pattern helicopter versions have programmable fail safe systems use 1991 ready PCM ABC&W receivers Both versions come wTh four 4001 servos rechargeable transmitter airborne batteries full servo mounting hardware swch harness Available now through ic,flJllCSw local hobby dealer yesterdays prices Distributed Hobby Dynamics Distributors e 1-800-458-0241 PO Box 3726 Champaign IL 61826-3 72 6 1-217-355-0058 October 1989 179 Analog Flexibility
Edition: Model Aviation - 1989/10
Page Numbers: 76, 77, 78, 176, 178, 179
Rubber Scale flight alive well Czechoslovakia P-51 H excellent example developmental end point Mustangs evolution its pretty lines larger wings tail H variant makes perfect modeling subject its characteristi cally dependable stable flight thank Bill Warner help getting publishable state ELubomir Koutny About author Lubomir Koutny known throughout world modeling community accomplished designers fliers anywhere has years experience fields rubber-powered aircraft Today Czechoslovakia Peanut Scale A0-scale rage lat ter being mostly planes World War II due clean configurations high per formance potential P-SJH finest all-around Rubber Scale models 1A0 class representative fine work being done today Czechoslo vakia THE FINAL production variant leg endary Mustang fighter P-51H also fastest line World War II aircraft Although came along too late take part European operations few did see action against Japan closing days war As modeling subject de velopmental end point Mustang fighter series has distinct advantages over P-5 1 D larger tail simplified under76 Model Aviation Big picture Mr Koutny has built several P-51H models various sizes structural tech niques plane pictured original model plan depicts built 1980 o scale model has wingspan 570mm weighs 48 grams version has re corded up 70-second flights Above author seen displaying original P-51H Full-Size Plans Available Page 196 O 110 MB BALSA SPARz o MB BALSA SPARE7H5 MM BALSA CE TAPERS TO 23MMTAPERS TO 213 MBTAPERS TO 4R MUSUM BALSA SHEET DUB BALSA 1 TIP ~ .jWIGAN PAP H AILERON PAPER TABESLIART ACETATE HOE Er2 ES MU PAPERTAILAREEL APTIOBAR 15 BB BALSA SHEET2B MBft-- ABOAET E ABOVE 00 IIRIB IIII CE FRAUTE PROW PATTERS FOR DARTISS AlSO RBS BARE PROW PO CE EROB BELOW t015 BM BALSA TE EROB K. Ff7 RftBB BALSASTABlERLINES BR BALSAOREET B 65w 7 FORBERS 2 TRW B 7 THRA ARE MB BALSA SHEET S H S ARE 2MM IBM C GROOR25MMRIO BAMBOO PROP BLADE -POWER2 LOAPS OF BOBBER 700 MM IORILHNG TORUS AOA EHRAOST PORTSPLIGHT TIRE70 SECOURS REISUTAOS MODEL AVIATION HISS TOP B BOTTOMMUSTANG P 51 H BAUD PAPERI/DO SCALE RUBBER POWERED 5B RBCOLAP SCKERAE OVERALL SILOER-AREY BLADE PROPDESIGNED BY LOBOMIR KOVYNY B5S11TBFUSELAGEFRONTBLADES SCARE PASELDRAWN BY PETR MIIGULASEK O3B2EPEGROUSE TRIM AS SHORS________________________________ PAPERTRACING VIEW0 EM AR CO YROREBY carriage smaller wheels lowdrag wing An excellent model P-51H has flown successfully Czech modelers other A0-scale ships confined model box due bad winds Though its recommended begin ners constructing warbird wont too difficult have built few Scale models Choosing right balsa light strong using light glue will result flying weight exceeding 50 grams model has wingspan 22 3/4 should translate favorably light wing loading Wing ribs made A2 C-grain balsa sheet Use stacking method wish procedure root rib tip rib made hard material placed opposite sides stack A2 blanks held together couple pins Planing sanding down until match either end produces evenly tapered sizes between blanks will require minor finishing before installation Slots two top two bottom spars /6-sq hard balsa can sanded stack still joined Note notch sanded rib attach ment point trailing edge plan An easier lighter wing construction method sliced rib technique shown plan After making pattern thin plywood plastic aluminum sheet shown slice both upper lower por tions rib /16 sheet trim indicated lengths Note lower surface wing flat Block up rear rib little trailing edge will follow downward curve attached leading edge tapered will above building board due upward curve front rib Wash out recommended can built raising wing tip bit trailing edge during construction stable glide can accomplished slimming down airfoil right wing slightly choice dihedral angle deter mined youre going fly mod el flying wheels-down indoors will require little dihedral shown An outdoor model flown gear up should have 1% l4 dihedral Fuselage An on-the-half-shell construc October 1989 77 Pictured its bare bones Mr Koutnys latest version line Mustangs air plane has sheeted fuselage front strength realism wing spars built up sliced-rib construction used ribs well stabilizer tar weight reduction tion method used Pin down upper lower /16 sheet keels cut A2 sheet bulkheads half vertically cement left side halves place perpendicular plan locations shown left side outline keel cut /16 sheet glued allowed dry Remove left-half fuselage assembly board install right halves bulkheads Add right side outline keel piece basic fuselage ready receive stringers stringers sliced strong medium-weight balsa Soft material will al low stringers pull between bulk heads giving starved-horse effect Use A0 sheet slice stringers follow ing curve fuselage best re sults tapering A0-sq nose A0 x A2 tail save weight stringers glued top bulk head formers rather fitted notches quite closely spaced about /6 give fuller realistic look still retaining lightness Standard straight stringers used tend distort fuselage Dont add bottom stringers until after wings attached radiator block carved very light balsa installed after model has covered front end fuselage can sheeted extra realism strength shown latest version model Tail Use lightest strongest balsa can find Pin wood down plastic wrap avoid its sticking plan Note airfoil sanded top stabilizer tail surfaces may also made /16 sheet desired Undercarriage Make landing gear de tachable plugging built-in paper tubes wing model looks flies better gear dangling down Make wheels soft balsa Styro foam small rolled-paper tubes through centers axle bearings Propeller Cut four blades strong Cgrain %2 sheet Glue bamboo axes Sand airfoil section Clark Y twist blades using hot iron can also made three laminations /32 sheet formed over molding block Finish blades nitrate dope Czechoslovaki modelers find spray used shoe re pairing does excellent job use poly styrene around wire hook prop shaft 2 Take care carving nose block spinner assembly ensure good fit Make sure paper tube blade inserts stalled straight keep blades wob bling Dont glue bamboo blade stubs solidly until after flight testing has fin ished3 Note circular plywood ramp freewheeling inside spinner should 1 0 right 20 left downthrust built nose block Covering Use either Japanese tissue lightness lightest grade Modelspan greater realism Japanese Sakai silver tis sue works well Cover model carefully finish well-thinned nitrate dope Finishing solid color such Humbrol line adds weight also enhances realism should applied sparingly airbrush Remember silver finish accentuates construction 78 Model Aviation Mr Koutny isnt building rubber-powered P-51H Mus tangs Czechoslovakia left Radek Koval shows off P 51H featuring solid rib construction all-sheet tail surface airplane dates back 1973 Above P-51J variant built Ivo Ceresnak 1975 Note different cockpit exhaust stack configuration flew well despite its heavy sprayed-silver paint job Continued page 176 Details propeller nose block hook landing gear undercarriage legs con structed bamboo epoxied aluminum yoke Styrofoam wheels landing gear legs plug paper tubes built wings order facilitate removal flying prop blades plug paper tubes built spinner bamboo stems may have adlusted get best flight performance before being permanently glued place close up nose block/spinner shows Czech hook encased trans parent plastic Its purpose may best de scribed Mr Koutnys own words Make Czech hook axis polystyrene better opposite some cordon needed perfect rubber prop work ing Its left reader figure out r Mystery Products little-known facts about two well-known products should help take mystery out modeling projects FLEXA Ideal non-porous materials fiber glass Use sparingly plywood fiberglass dont use Zip-Kicker Results tremendous bonding power just wont vibrate loose no stronger formula available anywhere POLS ZATh Adheres plastic surface including Lexan other modern plastics Also glue canopies fogging Use couple drops just little Zip-Kickertm esellent results HE ~CY- / ADHESIVE SYsTEM POce Tech Californd USA backyard fence since repaired it ready again test under power felt go Wright Field contest get some experience already pre-entered NFFS/US Outdoor Champs held couple weeks Lawrenceville IL son-in-law arrived contest site about 1100 am. now decided going watch ran old friend Harry Murphy made go get plane said would probably would fly introduced some flying friends looked over plane commented about several strange novations said plane appeared legal flightworthy -Although extremely nervous did some thing irrational decided fly plane suggested put prop backwards some technical reasons did Harry helped get DT fuse correctly align tail section After having some trouble engine fi nally started Now really nervous un hooked battery got ready launch Zeek mind blank tossed plane air took off low half-circle right other contestants finally climbed little surprise gained altitude fast -As proudly watched fly several sec onds Harry asked set timer No Did light DT fuse No Meanwhile Zeek proudly roared higher higher way Harry commented large fuel tank thoughtfully filled very top Now Harry also panicked jumped motorbike told get car drive around outside field quickly headed downwind south took about 10 minutes get outside base around downwind fence get parked start looking plane spotted Harry riding towards motorbike stopped temporarily stuck something finally got going again rode up fence noticed gotten mud over pants told plane OK gotten stuck mud plane run out gas stalled badly came down pretty quickly got lost going back ended up taking lap around base About 15 minutes later got back plane OK Harry going have cleanine bill Harry said planes CO right move forward already holes got out tools moved engine ward about half-inch ready fly again Also Harry gave bigger prop stalled backwards another test flight think Harry may have lost some confidence because suggested move away cars little bit Several guys made sug gestions about launch wind light fuse start timer guy said seen guys forget otherbut both engine started lot quicker time tried light fuse wind off prop blew out lighter thought heck set timer away went upwind did couple twists timer shut engine off made few circles glide made nice three-point landing about quarter mile away Harry asked about fuse ex plained did work Another lesson gave piece clothesline rope keep burning light DT fuse can blow out ready flight number three put prop right way power set timer longer engine run started engine lit fuse let Zeek go noticed wind changed set off downwind again went pretty well again DT did work circled around headed other fliers Everyone started duck ing made another three-point landing middle contestants area No hurt ready flight four did everything right time flew greatstraight up high timer shut off 10 seconds Zeek circled down glided perfectly landed about 300 ards away DTd about six feet off ground shorten fuse ready flight five flight super flew high fast staying up forever praying OT pop up Shortly thereafter did pop Zeek fell gently ground made day guys congratulated good plane good flight felt like Free Flighter packed up called day watched Harry fly Pee Wee 30 brand-new some problems after two flights made some adjustments called timer got maximum flight thought would never come down get bike go about quarter-mile get Success could leave well enough alone Now expert decided make another flight did everything right sent up rolled over powered ground broken wing tip some nose damage resulted Well back reality guys said got initia tion got feet wet welcomed club wished good luck packed up quite confident before lot smarter experienced few hours earlier am looking forward next contest headed home 53-year-old Free Flight rookie Les Hallgarth June 4 1989 says doesnt thats about time See ya downwind P-51 B/Koutny Con finued page 78 flaws Though P-51H has flown racer boys prefer build warbird Cockpit panel drawn photocopied instruments pilot radio can added extra realism canopy can made thin 03mm acetate sheet heated frame before pressing shaped cockpit mold Flight trimming Check wing washout adjust necessary original model trimmed fly left-left re quired about s up elevator4 rudder bent slightly left As model turn ing left left wing should have little less washout right order crease its lift slightly Make sure thrust line 20 40 down 10 right Rubber original model flown vintage 1972 Pirelli subsequent edi tions have flown successfully Alfa Continued page 178 176 Model Aviation Stack f Immediate Slat paaaent ZEMOAH G-62 37 Cu In $26495 ZENOAN G-23 96 ZENOAM 038 $17896 SACHI 28 TCA 838000 SACHS 32 TCA 50 SACHS 37 CDI 00 SACIlS 37 TCA 00 SACHS 58 CDI 00 SACHO 58 TCA 00 JOo Me. ERCOUPEPLANS 02386 FULL KIT $23881 Jin Meaer TOMAHAWKPLANS $2386 FULL KIT 023888 Jim Meoser J3 KITTENPLANS $2886 FULL KIT $21886 FLORIO FLYER NIFTY-SO kit$9286 FLORIC FLYER40 kit 07186FF 80 kit 6 SUPER-FLEX Goline tobino /ft 38/0160050/03800 FLOATS 48114 stalenore $3186 complet kit $4786 10 WW1 WHEELS 6P1K Spring Starter 02486 PLANS supos STEARMAN lIdlGodfrey/$3886 1I3TAYLORCRAFTor1I3CuB NeIIU03881 MGA Painted Pilot Boats 1/4 so. WW1 WV12 Cit$1886 Servos H-402 42 $1295 World 518 leg. nodel $4486 Prop 11 since ER TOP FLITE OYNATHRUST 30% off US Osedro FUELTANKS180. $78633 0886 FIBERGLASS ARROW SHAFTS 6/18023 long 6 $1186 24 Hr Sorvios $286 p000g 80k Cheok MO JIM MESSERS QUALITY MODEL PRODUCTS Valley View Drive Box 43 AlIegany NY 14706 Recoil Tubing XL same design original Recoil Tubing now Incorporated longer tube New Fourmost Recoil Tubin XL six foot length super tough fuel proof urethane tubing preformed SIX Inch coil After use tubin will retract its original spacesaving form out soil out way Recoil Tubing XL may used gasoline diesel well glow fuel Price $550 No 135 Size 1/8 lD FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 attached fuel can allows placement field box fuel can convenient distance aircraft boat Almost Ready Fly. Requires few hours assembly. Includes necessary accessories/hardware sa construction precovered 20-25 Size CHEROKEE 48 wing span Special -45 Size SHARP 40 Size now available 9858 Foam core Shea edWng Buy 2 more. PO Box 3634 Cerritos CA 907033634The Red Arrow 213 946-127020 Size 95COO Money Orders 40 Size 95Checks Accepted allow 7 addItional dayel A-4SkyhawkF20 Tgerehark 34 wingspan36 oingnpao 400 no 0. ares330 nq 38 lengnh38 leopth $4500 0 $300 S/H$4800 4 8300 S/il Want go vertica1 tOniJet Series Ai Skohauk sod P20 Tige shark nih allon jetlike pen ornonce nO ti ost hassle nhe ducted Bho orrheexpenn Both kits balsa construtnios sprice spar sings p can act osnod Standard servo 4 channel radi o systens accept 20 28 nine enginen eatepnhona petf ornasce use t 21 25 teStes haust engines Ai sneesh core docile loser npre dn kitn ore th einter nediste PArer Ae suer plans nod canopien nh ose sho nish scratch hoild $1300 Plans Canopy $1000 Plans ocly Other products anailahlr Fuel InjettiOo frens Fans Bats Aleard Pipes Innonatine yodel Pro 05cm WAIl hits Plans Sendcheck Money Order coDadd$3 FLResadd6% salestax 305 581-4477 PARRISH AIRCRAFT& Scale Models ll25SW4SthTer Plantation FL33317 Romeo rubber poorquality Filati times between 60 75 seconds dead air big prop helps keep model flying away Straight castor oil used lubricant using Sig contest rubber FAI rubber might start three loops 3mm %2 about 28 long5 great deal depends models weight pitch its propeller blades Flying Check balance point make sure center-of-gravity shown plan line front cockpit isnt correct add weight nose tail bring airplane balance Try test glide high grass aiming nose slightly downward well model should glide about 12 yards straight line gentle left turn stalls dives check rubber position see its bunching up shifting center-of-gravity Give rubber about 250 turns maiden flight model should fly gently leftward perhaps climb little stalls nose goes up too much under power falls put little downthrust adding thin shim between top nose block nose flight satisfactory boost power 500 turns model should climb left glide left climbs first half circle de scends second half add wash out right wing additional test glides Once glide acceptable can move up 800 1000 turns fly big torque moment airplane should climb easily over 150-ft altitude Make minor corrections between flights never attempt adjustment time P-51H excellent flier will give consistent results invite write questions comments Ing Lubomir Koutny Zahrebska 33 61600 Brno Czechoslovakia Good luck competent dependable Scale model reader preparing above text faced problem conveying Mr Koutnys words well could Al though English infinitely better 178 Model Aviation THE PIPER BRAVE e 1/4 scale model Piper s latest Ag plane e 10 ft wing span e 30-33 lbs e 50-75 cc power e 5-10 lb payload e Operational flaps hopper door e Optional Spreader Kit e Pre-formed aluminum landing gear e Fiberglass cowls Vacuum-formed canopy e Constucted extruded foam ply hardwood e smoker l ISBRAVE $269~OPTIONAL SEND $100 FOR CATALOG OFQ 4/7RT 1 NEODESHA KS 66757 SAC KITS AND ACCESSORIES316 325-2821 Free Shipping Kit OrdersScott Airplane CompanyVISA/MASTERCARD Czech much will less crystal-clear average modeler apol ogize verbal inadequacies urge builder carefully examine model photos plan help clarify things may also write Mr Koutny ques tions tell him about model Bill Warner Footnotes following notes pre sented Mr Koutnys exact words al low various interpretations better gliding stability good right half wing tip has some slimmer aerofoil opposite left 2 Make Czech hook axis poly styrene better opposite some cor don needed perfect rubber prop working pattern correct blade angles adjustment pitch 0160mm 350mm good elevator has little twist 2mm enough 5Engine 12g FAI rubber 6 x /24 x %2 flight undercarriage 8 x A4 x Y32 ROG CL Scale/Boss Continued page 79 touch-and-go taxi lap retract extend landing gear Because flight portion event counts half total score importance choos ing model good flying characteristics will readily apparent course capability experience person holding control han dle play large part success failure model flight key word pracrice point might worthwhile inject extra thought flight portion event Much has said past about military fighter multiengine models having advan tage over less sophisticated civilian-type air craft during flight portion competition dont think thats entirely true because aircraft basically simple de signs yet compete effectively against phisticated types simplest subjects judged four obligatory maneuvers finding maneu vers fill out six optional selections can chosen options listed AMA FAI Scale rules should present little difficulty Most models capable taxiing two options performing touch-and-go two options engine control engine cutoff option Thats five six options needed last option could depending subject modeled operation wing flaps crop dusting other similar maneuver summary should choose model can documented both Accuracy Outline Finish Color Markings has neces sary features options filling out flight plan has good flight characteristics youre careful selecting subject gath ering data youre able fill out flight plan well learn flight characteris tics model youll rewarded K NARROW BAID V SITS A9 84Computer Ingenuity Intended serious flyer PCM 9 offers few compromises wfth some novative features have changed standards radio systems will judged transmftter hasthe lookandfeelofahigh performance no nonsense piece equipment control sticks supported two ball bearings axis ot movement adjustable length Frequencies can quickly changed swapping modules servo direction travel adjustable nine channels direct servo controller allows operation radio ground someone else uses same frequency Both pattern helicopter versions have programmable fail safe systems use 1991 ready PCM ABC&W receivers Both versions come wTh four 4001 servos rechargeable transmitter airborne batteries full servo mounting hardware swch harness Available now through ic,flJllCSw local hobby dealer yesterdays prices Distributed Hobby Dynamics Distributors e 1-800-458-0241 PO Box 3726 Champaign IL 61826-3 72 6 1-217-355-0058 October 1989 179 Analog Flexibility
Edition: Model Aviation - 1989/10
Page Numbers: 76, 77, 78, 176, 178, 179
Rubber Scale flight alive well Czechoslovakia P-51 H excellent example developmental end point Mustangs evolution its pretty lines larger wings tail H variant makes perfect modeling subject its characteristi cally dependable stable flight thank Bill Warner help getting publishable state ELubomir Koutny About author Lubomir Koutny known throughout world modeling community accomplished designers fliers anywhere has years experience fields rubber-powered aircraft Today Czechoslovakia Peanut Scale A0-scale rage lat ter being mostly planes World War II due clean configurations high per formance potential P-SJH finest all-around Rubber Scale models 1A0 class representative fine work being done today Czechoslo vakia THE FINAL production variant leg endary Mustang fighter P-51H also fastest line World War II aircraft Although came along too late take part European operations few did see action against Japan closing days war As modeling subject de velopmental end point Mustang fighter series has distinct advantages over P-5 1 D larger tail simplified under76 Model Aviation Big picture Mr Koutny has built several P-51H models various sizes structural tech niques plane pictured original model plan depicts built 1980 o scale model has wingspan 570mm weighs 48 grams version has re corded up 70-second flights Above author seen displaying original P-51H Full-Size Plans Available Page 196 O 110 MB BALSA SPARz o MB BALSA SPARE7H5 MM BALSA CE TAPERS TO 23MMTAPERS TO 213 MBTAPERS TO 4R MUSUM BALSA SHEET DUB BALSA 1 TIP ~ .jWIGAN PAP H AILERON PAPER TABESLIART ACETATE HOE Er2 ES MU PAPERTAILAREEL APTIOBAR 15 BB BALSA SHEET2B MBft-- ABOAET E ABOVE 00 IIRIB IIII CE FRAUTE PROW PATTERS FOR DARTISS AlSO RBS BARE PROW PO CE EROB BELOW t015 BM BALSA TE EROB K. Ff7 RftBB BALSASTABlERLINES BR BALSAOREET B 65w 7 FORBERS 2 TRW B 7 THRA ARE MB BALSA SHEET S H S ARE 2MM IBM C GROOR25MMRIO BAMBOO PROP BLADE -POWER2 LOAPS OF BOBBER 700 MM IORILHNG TORUS AOA EHRAOST PORTSPLIGHT TIRE70 SECOURS REISUTAOS MODEL AVIATION HISS TOP B BOTTOMMUSTANG P 51 H BAUD PAPERI/DO SCALE RUBBER POWERED 5B RBCOLAP SCKERAE OVERALL SILOER-AREY BLADE PROPDESIGNED BY LOBOMIR KOVYNY B5S11TBFUSELAGEFRONTBLADES SCARE PASELDRAWN BY PETR MIIGULASEK O3B2EPEGROUSE TRIM AS SHORS________________________________ PAPERTRACING VIEW0 EM AR CO YROREBY carriage smaller wheels lowdrag wing An excellent model P-51H has flown successfully Czech modelers other A0-scale ships confined model box due bad winds Though its recommended begin ners constructing warbird wont too difficult have built few Scale models Choosing right balsa light strong using light glue will result flying weight exceeding 50 grams model has wingspan 22 3/4 should translate favorably light wing loading Wing ribs made A2 C-grain balsa sheet Use stacking method wish procedure root rib tip rib made hard material placed opposite sides stack A2 blanks held together couple pins Planing sanding down until match either end produces evenly tapered sizes between blanks will require minor finishing before installation Slots two top two bottom spars /6-sq hard balsa can sanded stack still joined Note notch sanded rib attach ment point trailing edge plan An easier lighter wing construction method sliced rib technique shown plan After making pattern thin plywood plastic aluminum sheet shown slice both upper lower por tions rib /16 sheet trim indicated lengths Note lower surface wing flat Block up rear rib little trailing edge will follow downward curve attached leading edge tapered will above building board due upward curve front rib Wash out recommended can built raising wing tip bit trailing edge during construction stable glide can accomplished slimming down airfoil right wing slightly choice dihedral angle deter mined youre going fly mod el flying wheels-down indoors will require little dihedral shown An outdoor model flown gear up should have 1% l4 dihedral Fuselage An on-the-half-shell construc October 1989 77 Pictured its bare bones Mr Koutnys latest version line Mustangs air plane has sheeted fuselage front strength realism wing spars built up sliced-rib construction used ribs well stabilizer tar weight reduction tion method used Pin down upper lower /16 sheet keels cut A2 sheet bulkheads half vertically cement left side halves place perpendicular plan locations shown left side outline keel cut /16 sheet glued allowed dry Remove left-half fuselage assembly board install right halves bulkheads Add right side outline keel piece basic fuselage ready receive stringers stringers sliced strong medium-weight balsa Soft material will al low stringers pull between bulk heads giving starved-horse effect Use A0 sheet slice stringers follow ing curve fuselage best re sults tapering A0-sq nose A0 x A2 tail save weight stringers glued top bulk head formers rather fitted notches quite closely spaced about /6 give fuller realistic look still retaining lightness Standard straight stringers used tend distort fuselage Dont add bottom stringers until after wings attached radiator block carved very light balsa installed after model has covered front end fuselage can sheeted extra realism strength shown latest version model Tail Use lightest strongest balsa can find Pin wood down plastic wrap avoid its sticking plan Note airfoil sanded top stabilizer tail surfaces may also made /16 sheet desired Undercarriage Make landing gear de tachable plugging built-in paper tubes wing model looks flies better gear dangling down Make wheels soft balsa Styro foam small rolled-paper tubes through centers axle bearings Propeller Cut four blades strong Cgrain %2 sheet Glue bamboo axes Sand airfoil section Clark Y twist blades using hot iron can also made three laminations /32 sheet formed over molding block Finish blades nitrate dope Czechoslovaki modelers find spray used shoe re pairing does excellent job use poly styrene around wire hook prop shaft 2 Take care carving nose block spinner assembly ensure good fit Make sure paper tube blade inserts stalled straight keep blades wob bling Dont glue bamboo blade stubs solidly until after flight testing has fin ished3 Note circular plywood ramp freewheeling inside spinner should 1 0 right 20 left downthrust built nose block Covering Use either Japanese tissue lightness lightest grade Modelspan greater realism Japanese Sakai silver tis sue works well Cover model carefully finish well-thinned nitrate dope Finishing solid color such Humbrol line adds weight also enhances realism should applied sparingly airbrush Remember silver finish accentuates construction 78 Model Aviation Mr Koutny isnt building rubber-powered P-51H Mus tangs Czechoslovakia left Radek Koval shows off P 51H featuring solid rib construction all-sheet tail surface airplane dates back 1973 Above P-51J variant built Ivo Ceresnak 1975 Note different cockpit exhaust stack configuration flew well despite its heavy sprayed-silver paint job Continued page 176 Details propeller nose block hook landing gear undercarriage legs con structed bamboo epoxied aluminum yoke Styrofoam wheels landing gear legs plug paper tubes built wings order facilitate removal flying prop blades plug paper tubes built spinner bamboo stems may have adlusted get best flight performance before being permanently glued place close up nose block/spinner shows Czech hook encased trans parent plastic Its purpose may best de scribed Mr Koutnys own words Make Czech hook axis polystyrene better opposite some cordon needed perfect rubber prop work ing Its left reader figure out r Mystery Products little-known facts about two well-known products should help take mystery out modeling projects FLEXA Ideal non-porous materials fiber glass Use sparingly plywood fiberglass dont use Zip-Kicker Results tremendous bonding power just wont vibrate loose no stronger formula available anywhere POLS ZATh Adheres plastic surface including Lexan other modern plastics Also glue canopies fogging Use couple drops just little Zip-Kickertm esellent results HE ~CY- / ADHESIVE SYsTEM POce Tech Californd USA backyard fence since repaired it ready again test under power felt go Wright Field contest get some experience already pre-entered NFFS/US Outdoor Champs held couple weeks Lawrenceville IL son-in-law arrived contest site about 1100 am. now decided going watch ran old friend Harry Murphy made go get plane said would probably would fly introduced some flying friends looked over plane commented about several strange novations said plane appeared legal flightworthy -Although extremely nervous did some thing irrational decided fly plane suggested put prop backwards some technical reasons did Harry helped get DT fuse correctly align tail section After having some trouble engine fi nally started Now really nervous un hooked battery got ready launch Zeek mind blank tossed plane air took off low half-circle right other contestants finally climbed little surprise gained altitude fast -As proudly watched fly several sec onds Harry asked set timer No Did light DT fuse No Meanwhile Zeek proudly roared higher higher way Harry commented large fuel tank thoughtfully filled very top Now Harry also panicked jumped motorbike told get car drive around outside field quickly headed downwind south took about 10 minutes get outside base around downwind fence get parked start looking plane spotted Harry riding towards motorbike stopped temporarily stuck something finally got going again rode up fence noticed gotten mud over pants told plane OK gotten stuck mud plane run out gas stalled badly came down pretty quickly got lost going back ended up taking lap around base About 15 minutes later got back plane OK Harry going have cleanine bill Harry said planes CO right move forward already holes got out tools moved engine ward about half-inch ready fly again Also Harry gave bigger prop stalled backwards another test flight think Harry may have lost some confidence because suggested move away cars little bit Several guys made sug gestions about launch wind light fuse start timer guy said seen guys forget otherbut both engine started lot quicker time tried light fuse wind off prop blew out lighter thought heck set timer away went upwind did couple twists timer shut engine off made few circles glide made nice three-point landing about quarter mile away Harry asked about fuse ex plained did work Another lesson gave piece clothesline rope keep burning light DT fuse can blow out ready flight number three put prop right way power set timer longer engine run started engine lit fuse let Zeek go noticed wind changed set off downwind again went pretty well again DT did work circled around headed other fliers Everyone started duck ing made another three-point landing middle contestants area No hurt ready flight four did everything right time flew greatstraight up high timer shut off 10 seconds Zeek circled down glided perfectly landed about 300 ards away DTd about six feet off ground shorten fuse ready flight five flight super flew high fast staying up forever praying OT pop up Shortly thereafter did pop Zeek fell gently ground made day guys congratulated good plane good flight felt like Free Flighter packed up called day watched Harry fly Pee Wee 30 brand-new some problems after two flights made some adjustments called timer got maximum flight thought would never come down get bike go about quarter-mile get Success could leave well enough alone Now expert decided make another flight did everything right sent up rolled over powered ground broken wing tip some nose damage resulted Well back reality guys said got initia tion got feet wet welcomed club wished good luck packed up quite confident before lot smarter experienced few hours earlier am looking forward next contest headed home 53-year-old Free Flight rookie Les Hallgarth June 4 1989 says doesnt thats about time See ya downwind P-51 B/Koutny Con finued page 78 flaws Though P-51H has flown racer boys prefer build warbird Cockpit panel drawn photocopied instruments pilot radio can added extra realism canopy can made thin 03mm acetate sheet heated frame before pressing shaped cockpit mold Flight trimming Check wing washout adjust necessary original model trimmed fly left-left re quired about s up elevator4 rudder bent slightly left As model turn ing left left wing should have little less washout right order crease its lift slightly Make sure thrust line 20 40 down 10 right Rubber original model flown vintage 1972 Pirelli subsequent edi tions have flown successfully Alfa Continued page 178 176 Model Aviation Stack f Immediate Slat paaaent ZEMOAH G-62 37 Cu In $26495 ZENOAN G-23 96 ZENOAM 038 $17896 SACHI 28 TCA 838000 SACHS 32 TCA 50 SACHS 37 CDI 00 SACIlS 37 TCA 00 SACHS 58 CDI 00 SACHO 58 TCA 00 JOo Me. ERCOUPEPLANS 02386 FULL KIT $23881 Jin Meaer TOMAHAWKPLANS $2386 FULL KIT 023888 Jim Meoser J3 KITTENPLANS $2886 FULL KIT $21886 FLORIO FLYER NIFTY-SO kit$9286 FLORIC FLYER40 kit 07186FF 80 kit 6 SUPER-FLEX Goline tobino /ft 38/0160050/03800 FLOATS 48114 stalenore $3186 complet kit $4786 10 WW1 WHEELS 6P1K Spring Starter 02486 PLANS supos STEARMAN lIdlGodfrey/$3886 1I3TAYLORCRAFTor1I3CuB NeIIU03881 MGA Painted Pilot Boats 1/4 so. WW1 WV12 Cit$1886 Servos H-402 42 $1295 World 518 leg. nodel $4486 Prop 11 since ER TOP FLITE OYNATHRUST 30% off US Osedro FUELTANKS180. $78633 0886 FIBERGLASS ARROW SHAFTS 6/18023 long 6 $1186 24 Hr Sorvios $286 p000g 80k Cheok MO JIM MESSERS QUALITY MODEL PRODUCTS Valley View Drive Box 43 AlIegany NY 14706 Recoil Tubing XL same design original Recoil Tubing now Incorporated longer tube New Fourmost Recoil Tubin XL six foot length super tough fuel proof urethane tubing preformed SIX Inch coil After use tubin will retract its original spacesaving form out soil out way Recoil Tubing XL may used gasoline diesel well glow fuel Price $550 No 135 Size 1/8 lD FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 attached fuel can allows placement field box fuel can convenient distance aircraft boat Almost Ready Fly. Requires few hours assembly. Includes necessary accessories/hardware sa construction precovered 20-25 Size CHEROKEE 48 wing span Special -45 Size SHARP 40 Size now available 9858 Foam core Shea edWng Buy 2 more. PO Box 3634 Cerritos CA 907033634The Red Arrow 213 946-127020 Size 95COO Money Orders 40 Size 95Checks Accepted allow 7 addItional dayel A-4SkyhawkF20 Tgerehark 34 wingspan36 oingnpao 400 no 0. ares330 nq 38 lengnh38 leopth $4500 0 $300 S/H$4800 4 8300 S/il Want go vertica1 tOniJet Series Ai Skohauk sod P20 Tige shark nih allon jetlike pen ornonce nO ti ost hassle nhe ducted Bho orrheexpenn Both kits balsa construtnios sprice spar sings p can act osnod Standard servo 4 channel radi o systens accept 20 28 nine enginen eatepnhona petf ornasce use t 21 25 teStes haust engines Ai sneesh core docile loser npre dn kitn ore th einter nediste PArer Ae suer plans nod canopien nh ose sho nish scratch hoild $1300 Plans Canopy $1000 Plans ocly Other products anailahlr Fuel InjettiOo frens Fans Bats Aleard Pipes Innonatine yodel Pro 05cm WAIl hits Plans Sendcheck Money Order coDadd$3 FLResadd6% salestax 305 581-4477 PARRISH AIRCRAFT& Scale Models ll25SW4SthTer Plantation FL33317 Romeo rubber poorquality Filati times between 60 75 seconds dead air big prop helps keep model flying away Straight castor oil used lubricant using Sig contest rubber FAI rubber might start three loops 3mm %2 about 28 long5 great deal depends models weight pitch its propeller blades Flying Check balance point make sure center-of-gravity shown plan line front cockpit isnt correct add weight nose tail bring airplane balance Try test glide high grass aiming nose slightly downward well model should glide about 12 yards straight line gentle left turn stalls dives check rubber position see its bunching up shifting center-of-gravity Give rubber about 250 turns maiden flight model should fly gently leftward perhaps climb little stalls nose goes up too much under power falls put little downthrust adding thin shim between top nose block nose flight satisfactory boost power 500 turns model should climb left glide left climbs first half circle de scends second half add wash out right wing additional test glides Once glide acceptable can move up 800 1000 turns fly big torque moment airplane should climb easily over 150-ft altitude Make minor corrections between flights never attempt adjustment time P-51H excellent flier will give consistent results invite write questions comments Ing Lubomir Koutny Zahrebska 33 61600 Brno Czechoslovakia Good luck competent dependable Scale model reader preparing above text faced problem conveying Mr Koutnys words well could Al though English infinitely better 178 Model Aviation THE PIPER BRAVE e 1/4 scale model Piper s latest Ag plane e 10 ft wing span e 30-33 lbs e 50-75 cc power e 5-10 lb payload e Operational flaps hopper door e Optional Spreader Kit e Pre-formed aluminum landing gear e Fiberglass cowls Vacuum-formed canopy e Constucted extruded foam ply hardwood e smoker l ISBRAVE $269~OPTIONAL SEND $100 FOR CATALOG OFQ 4/7RT 1 NEODESHA KS 66757 SAC KITS AND ACCESSORIES316 325-2821 Free Shipping Kit OrdersScott Airplane CompanyVISA/MASTERCARD Czech much will less crystal-clear average modeler apol ogize verbal inadequacies urge builder carefully examine model photos plan help clarify things may also write Mr Koutny ques tions tell him about model Bill Warner Footnotes following notes pre sented Mr Koutnys exact words al low various interpretations better gliding stability good right half wing tip has some slimmer aerofoil opposite left 2 Make Czech hook axis poly styrene better opposite some cor don needed perfect rubber prop working pattern correct blade angles adjustment pitch 0160mm 350mm good elevator has little twist 2mm enough 5Engine 12g FAI rubber 6 x /24 x %2 flight undercarriage 8 x A4 x Y32 ROG CL Scale/Boss Continued page 79 touch-and-go taxi lap retract extend landing gear Because flight portion event counts half total score importance choos ing model good flying characteristics will readily apparent course capability experience person holding control han dle play large part success failure model flight key word pracrice point might worthwhile inject extra thought flight portion event Much has said past about military fighter multiengine models having advan tage over less sophisticated civilian-type air craft during flight portion competition dont think thats entirely true because aircraft basically simple de signs yet compete effectively against phisticated types simplest subjects judged four obligatory maneuvers finding maneu vers fill out six optional selections can chosen options listed AMA FAI Scale rules should present little difficulty Most models capable taxiing two options performing touch-and-go two options engine control engine cutoff option Thats five six options needed last option could depending subject modeled operation wing flaps crop dusting other similar maneuver summary should choose model can documented both Accuracy Outline Finish Color Markings has neces sary features options filling out flight plan has good flight characteristics youre careful selecting subject gath ering data youre able fill out flight plan well learn flight characteris tics model youll rewarded K NARROW BAID V SITS A9 84Computer Ingenuity Intended serious flyer PCM 9 offers few compromises wfth some novative features have changed standards radio systems will judged transmftter hasthe lookandfeelofahigh performance no nonsense piece equipment control sticks supported two ball bearings axis ot movement adjustable length Frequencies can quickly changed swapping modules servo direction travel adjustable nine channels direct servo controller allows operation radio ground someone else uses same frequency Both pattern helicopter versions have programmable fail safe systems use 1991 ready PCM ABC&W receivers Both versions come wTh four 4001 servos rechargeable transmitter airborne batteries full servo mounting hardware swch harness Available now through ic,flJllCSw local hobby dealer yesterdays prices Distributed Hobby Dynamics Distributors e 1-800-458-0241 PO Box 3726 Champaign IL 61826-3 72 6 1-217-355-0058 October 1989 179 Analog Flexibility
Edition: Model Aviation - 1989/10
Page Numbers: 76, 77, 78, 176, 178, 179
Rubber Scale flight alive well Czechoslovakia P-51 H excellent example developmental end point Mustangs evolution its pretty lines larger wings tail H variant makes perfect modeling subject its characteristi cally dependable stable flight thank Bill Warner help getting publishable state ELubomir Koutny About author Lubomir Koutny known throughout world modeling community accomplished designers fliers anywhere has years experience fields rubber-powered aircraft Today Czechoslovakia Peanut Scale A0-scale rage lat ter being mostly planes World War II due clean configurations high per formance potential P-SJH finest all-around Rubber Scale models 1A0 class representative fine work being done today Czechoslo vakia THE FINAL production variant leg endary Mustang fighter P-51H also fastest line World War II aircraft Although came along too late take part European operations few did see action against Japan closing days war As modeling subject de velopmental end point Mustang fighter series has distinct advantages over P-5 1 D larger tail simplified under76 Model Aviation Big picture Mr Koutny has built several P-51H models various sizes structural tech niques plane pictured original model plan depicts built 1980 o scale model has wingspan 570mm weighs 48 grams version has re corded up 70-second flights Above author seen displaying original P-51H Full-Size Plans Available Page 196 O 110 MB BALSA SPARz o MB BALSA SPARE7H5 MM BALSA CE TAPERS TO 23MMTAPERS TO 213 MBTAPERS TO 4R MUSUM BALSA SHEET DUB BALSA 1 TIP ~ .jWIGAN PAP H AILERON PAPER TABESLIART ACETATE HOE Er2 ES MU PAPERTAILAREEL APTIOBAR 15 BB BALSA SHEET2B MBft-- ABOAET E ABOVE 00 IIRIB IIII CE FRAUTE PROW PATTERS FOR DARTISS AlSO RBS BARE PROW PO CE EROB BELOW t015 BM BALSA TE EROB K. Ff7 RftBB BALSASTABlERLINES BR BALSAOREET B 65w 7 FORBERS 2 TRW B 7 THRA ARE MB BALSA SHEET S H S ARE 2MM IBM C GROOR25MMRIO BAMBOO PROP BLADE -POWER2 LOAPS OF BOBBER 700 MM IORILHNG TORUS AOA EHRAOST PORTSPLIGHT TIRE70 SECOURS REISUTAOS MODEL AVIATION HISS TOP B BOTTOMMUSTANG P 51 H BAUD PAPERI/DO SCALE RUBBER POWERED 5B RBCOLAP SCKERAE OVERALL SILOER-AREY BLADE PROPDESIGNED BY LOBOMIR KOVYNY B5S11TBFUSELAGEFRONTBLADES SCARE PASELDRAWN BY PETR MIIGULASEK O3B2EPEGROUSE TRIM AS SHORS________________________________ PAPERTRACING VIEW0 EM AR CO YROREBY carriage smaller wheels lowdrag wing An excellent model P-51H has flown successfully Czech modelers other A0-scale ships confined model box due bad winds Though its recommended begin ners constructing warbird wont too difficult have built few Scale models Choosing right balsa light strong using light glue will result flying weight exceeding 50 grams model has wingspan 22 3/4 should translate favorably light wing loading Wing ribs made A2 C-grain balsa sheet Use stacking method wish procedure root rib tip rib made hard material placed opposite sides stack A2 blanks held together couple pins Planing sanding down until match either end produces evenly tapered sizes between blanks will require minor finishing before installation Slots two top two bottom spars /6-sq hard balsa can sanded stack still joined Note notch sanded rib attach ment point trailing edge plan An easier lighter wing construction method sliced rib technique shown plan After making pattern thin plywood plastic aluminum sheet shown slice both upper lower por tions rib /16 sheet trim indicated lengths Note lower surface wing flat Block up rear rib little trailing edge will follow downward curve attached leading edge tapered will above building board due upward curve front rib Wash out recommended can built raising wing tip bit trailing edge during construction stable glide can accomplished slimming down airfoil right wing slightly choice dihedral angle deter mined youre going fly mod el flying wheels-down indoors will require little dihedral shown An outdoor model flown gear up should have 1% l4 dihedral Fuselage An on-the-half-shell construc October 1989 77 Pictured its bare bones Mr Koutnys latest version line Mustangs air plane has sheeted fuselage front strength realism wing spars built up sliced-rib construction used ribs well stabilizer tar weight reduction tion method used Pin down upper lower /16 sheet keels cut A2 sheet bulkheads half vertically cement left side halves place perpendicular plan locations shown left side outline keel cut /16 sheet glued allowed dry Remove left-half fuselage assembly board install right halves bulkheads Add right side outline keel piece basic fuselage ready receive stringers stringers sliced strong medium-weight balsa Soft material will al low stringers pull between bulk heads giving starved-horse effect Use A0 sheet slice stringers follow ing curve fuselage best re sults tapering A0-sq nose A0 x A2 tail save weight stringers glued top bulk head formers rather fitted notches quite closely spaced about /6 give fuller realistic look still retaining lightness Standard straight stringers used tend distort fuselage Dont add bottom stringers until after wings attached radiator block carved very light balsa installed after model has covered front end fuselage can sheeted extra realism strength shown latest version model Tail Use lightest strongest balsa can find Pin wood down plastic wrap avoid its sticking plan Note airfoil sanded top stabilizer tail surfaces may also made /16 sheet desired Undercarriage Make landing gear de tachable plugging built-in paper tubes wing model looks flies better gear dangling down Make wheels soft balsa Styro foam small rolled-paper tubes through centers axle bearings Propeller Cut four blades strong Cgrain %2 sheet Glue bamboo axes Sand airfoil section Clark Y twist blades using hot iron can also made three laminations /32 sheet formed over molding block Finish blades nitrate dope Czechoslovaki modelers find spray used shoe re pairing does excellent job use poly styrene around wire hook prop shaft 2 Take care carving nose block spinner assembly ensure good fit Make sure paper tube blade inserts stalled straight keep blades wob bling Dont glue bamboo blade stubs solidly until after flight testing has fin ished3 Note circular plywood ramp freewheeling inside spinner should 1 0 right 20 left downthrust built nose block Covering Use either Japanese tissue lightness lightest grade Modelspan greater realism Japanese Sakai silver tis sue works well Cover model carefully finish well-thinned nitrate dope Finishing solid color such Humbrol line adds weight also enhances realism should applied sparingly airbrush Remember silver finish accentuates construction 78 Model Aviation Mr Koutny isnt building rubber-powered P-51H Mus tangs Czechoslovakia left Radek Koval shows off P 51H featuring solid rib construction all-sheet tail surface airplane dates back 1973 Above P-51J variant built Ivo Ceresnak 1975 Note different cockpit exhaust stack configuration flew well despite its heavy sprayed-silver paint job Continued page 176 Details propeller nose block hook landing gear undercarriage legs con structed bamboo epoxied aluminum yoke Styrofoam wheels landing gear legs plug paper tubes built wings order facilitate removal flying prop blades plug paper tubes built spinner bamboo stems may have adlusted get best flight performance before being permanently glued place close up nose block/spinner shows Czech hook encased trans parent plastic Its purpose may best de scribed Mr Koutnys own words Make Czech hook axis polystyrene better opposite some cordon needed perfect rubber prop work ing Its left reader figure out r Mystery Products little-known facts about two well-known products should help take mystery out modeling projects FLEXA Ideal non-porous materials fiber glass Use sparingly plywood fiberglass dont use Zip-Kicker Results tremendous bonding power just wont vibrate loose no stronger formula available anywhere POLS ZATh Adheres plastic surface including Lexan other modern plastics Also glue canopies fogging Use couple drops just little Zip-Kickertm esellent results HE ~CY- / ADHESIVE SYsTEM POce Tech Californd USA backyard fence since repaired it ready again test under power felt go Wright Field contest get some experience already pre-entered NFFS/US Outdoor Champs held couple weeks Lawrenceville IL son-in-law arrived contest site about 1100 am. now decided going watch ran old friend Harry Murphy made go get plane said would probably would fly introduced some flying friends looked over plane commented about several strange novations said plane appeared legal flightworthy -Although extremely nervous did some thing irrational decided fly plane suggested put prop backwards some technical reasons did Harry helped get DT fuse correctly align tail section After having some trouble engine fi nally started Now really nervous un hooked battery got ready launch Zeek mind blank tossed plane air took off low half-circle right other contestants finally climbed little surprise gained altitude fast -As proudly watched fly several sec onds Harry asked set timer No Did light DT fuse No Meanwhile Zeek proudly roared higher higher way Harry commented large fuel tank thoughtfully filled very top Now Harry also panicked jumped motorbike told get car drive around outside field quickly headed downwind south took about 10 minutes get outside base around downwind fence get parked start looking plane spotted Harry riding towards motorbike stopped temporarily stuck something finally got going again rode up fence noticed gotten mud over pants told plane OK gotten stuck mud plane run out gas stalled badly came down pretty quickly got lost going back ended up taking lap around base About 15 minutes later got back plane OK Harry going have cleanine bill Harry said planes CO right move forward already holes got out tools moved engine ward about half-inch ready fly again Also Harry gave bigger prop stalled backwards another test flight think Harry may have lost some confidence because suggested move away cars little bit Several guys made sug gestions about launch wind light fuse start timer guy said seen guys forget otherbut both engine started lot quicker time tried light fuse wind off prop blew out lighter thought heck set timer away went upwind did couple twists timer shut engine off made few circles glide made nice three-point landing about quarter mile away Harry asked about fuse ex plained did work Another lesson gave piece clothesline rope keep burning light DT fuse can blow out ready flight number three put prop right way power set timer longer engine run started engine lit fuse let Zeek go noticed wind changed set off downwind again went pretty well again DT did work circled around headed other fliers Everyone started duck ing made another three-point landing middle contestants area No hurt ready flight four did everything right time flew greatstraight up high timer shut off 10 seconds Zeek circled down glided perfectly landed about 300 ards away DTd about six feet off ground shorten fuse ready flight five flight super flew high fast staying up forever praying OT pop up Shortly thereafter did pop Zeek fell gently ground made day guys congratulated good plane good flight felt like Free Flighter packed up called day watched Harry fly Pee Wee 30 brand-new some problems after two flights made some adjustments called timer got maximum flight thought would never come down get bike go about quarter-mile get Success could leave well enough alone Now expert decided make another flight did everything right sent up rolled over powered ground broken wing tip some nose damage resulted Well back reality guys said got initia tion got feet wet welcomed club wished good luck packed up quite confident before lot smarter experienced few hours earlier am looking forward next contest headed home 53-year-old Free Flight rookie Les Hallgarth June 4 1989 says doesnt thats about time See ya downwind P-51 B/Koutny Con finued page 78 flaws Though P-51H has flown racer boys prefer build warbird Cockpit panel drawn photocopied instruments pilot radio can added extra realism canopy can made thin 03mm acetate sheet heated frame before pressing shaped cockpit mold Flight trimming Check wing washout adjust necessary original model trimmed fly left-left re quired about s up elevator4 rudder bent slightly left As model turn ing left left wing should have little less washout right order crease its lift slightly Make sure thrust line 20 40 down 10 right Rubber original model flown vintage 1972 Pirelli subsequent edi tions have flown successfully Alfa Continued page 178 176 Model Aviation Stack f Immediate Slat paaaent ZEMOAH G-62 37 Cu In $26495 ZENOAN G-23 96 ZENOAM 038 $17896 SACHI 28 TCA 838000 SACHS 32 TCA 50 SACHS 37 CDI 00 SACIlS 37 TCA 00 SACHS 58 CDI 00 SACHO 58 TCA 00 JOo Me. ERCOUPEPLANS 02386 FULL KIT $23881 Jin Meaer TOMAHAWKPLANS $2386 FULL KIT 023888 Jim Meoser J3 KITTENPLANS $2886 FULL KIT $21886 FLORIO FLYER NIFTY-SO kit$9286 FLORIC FLYER40 kit 07186FF 80 kit 6 SUPER-FLEX Goline tobino /ft 38/0160050/03800 FLOATS 48114 stalenore $3186 complet kit $4786 10 WW1 WHEELS 6P1K Spring Starter 02486 PLANS supos STEARMAN lIdlGodfrey/$3886 1I3TAYLORCRAFTor1I3CuB NeIIU03881 MGA Painted Pilot Boats 1/4 so. WW1 WV12 Cit$1886 Servos H-402 42 $1295 World 518 leg. nodel $4486 Prop 11 since ER TOP FLITE OYNATHRUST 30% off US Osedro FUELTANKS180. $78633 0886 FIBERGLASS ARROW SHAFTS 6/18023 long 6 $1186 24 Hr Sorvios $286 p000g 80k Cheok MO JIM MESSERS QUALITY MODEL PRODUCTS Valley View Drive Box 43 AlIegany NY 14706 Recoil Tubing XL same design original Recoil Tubing now Incorporated longer tube New Fourmost Recoil Tubin XL six foot length super tough fuel proof urethane tubing preformed SIX Inch coil After use tubin will retract its original spacesaving form out soil out way Recoil Tubing XL may used gasoline diesel well glow fuel Price $550 No 135 Size 1/8 lD FOURMOST PRODUCTS 4040 24TH AVEFOREST GROVE OR 97116503 357-2732 attached fuel can allows placement field box fuel can convenient distance aircraft boat Almost Ready Fly. Requires few hours assembly. Includes necessary accessories/hardware sa construction precovered 20-25 Size CHEROKEE 48 wing span Special -45 Size SHARP 40 Size now available 9858 Foam core Shea edWng Buy 2 more. PO Box 3634 Cerritos CA 907033634The Red Arrow 213 946-127020 Size 95COO Money Orders 40 Size 95Checks Accepted allow 7 addItional dayel A-4SkyhawkF20 Tgerehark 34 wingspan36 oingnpao 400 no 0. ares330 nq 38 lengnh38 leopth $4500 0 $300 S/H$4800 4 8300 S/il Want go vertica1 tOniJet Series Ai Skohauk sod P20 Tige shark nih allon jetlike pen ornonce nO ti ost hassle nhe ducted Bho orrheexpenn Both kits balsa construtnios sprice spar sings p can act osnod Standard servo 4 channel radi o systens accept 20 28 nine enginen eatepnhona petf ornasce use t 21 25 teStes haust engines Ai sneesh core docile loser npre dn kitn ore th einter nediste PArer Ae suer plans nod canopien nh ose sho nish scratch hoild $1300 Plans Canopy $1000 Plans ocly Other products anailahlr Fuel InjettiOo frens Fans Bats Aleard Pipes Innonatine yodel Pro 05cm WAIl hits Plans Sendcheck Money Order coDadd$3 FLResadd6% salestax 305 581-4477 PARRISH AIRCRAFT& Scale Models ll25SW4SthTer Plantation FL33317 Romeo rubber poorquality Filati times between 60 75 seconds dead air big prop helps keep model flying away Straight castor oil used lubricant using Sig contest rubber FAI rubber might start three loops 3mm %2 about 28 long5 great deal depends models weight pitch its propeller blades Flying Check balance point make sure center-of-gravity shown plan line front cockpit isnt correct add weight nose tail bring airplane balance Try test glide high grass aiming nose slightly downward well model should glide about 12 yards straight line gentle left turn stalls dives check rubber position see its bunching up shifting center-of-gravity Give rubber about 250 turns maiden flight model should fly gently leftward perhaps climb little stalls nose goes up too much under power falls put little downthrust adding thin shim between top nose block nose flight satisfactory boost power 500 turns model should climb left glide left climbs first half circle de scends second half add wash out right wing additional test glides Once glide acceptable can move up 800 1000 turns fly big torque moment airplane should climb easily over 150-ft altitude Make minor corrections between flights never attempt adjustment time P-51H excellent flier will give consistent results invite write questions comments Ing Lubomir Koutny Zahrebska 33 61600 Brno Czechoslovakia Good luck competent dependable Scale model reader preparing above text faced problem conveying Mr Koutnys words well could Al though English infinitely better 178 Model Aviation THE PIPER BRAVE e 1/4 scale model Piper s latest Ag plane e 10 ft wing span e 30-33 lbs e 50-75 cc power e 5-10 lb payload e Operational flaps hopper door e Optional Spreader Kit e Pre-formed aluminum landing gear e Fiberglass cowls Vacuum-formed canopy e Constucted extruded foam ply hardwood e smoker l ISBRAVE $269~OPTIONAL SEND $100 FOR CATALOG OFQ 4/7RT 1 NEODESHA KS 66757 SAC KITS AND ACCESSORIES316 325-2821 Free Shipping Kit OrdersScott Airplane CompanyVISA/MASTERCARD Czech much will less crystal-clear average modeler apol ogize verbal inadequacies urge builder carefully examine model photos plan help clarify things may also write Mr Koutny ques tions tell him about model Bill Warner Footnotes following notes pre sented Mr Koutnys exact words al low various interpretations better gliding stability good right half wing tip has some slimmer aerofoil opposite left 2 Make Czech hook axis poly styrene better opposite some cor don needed perfect rubber prop working pattern correct blade angles adjustment pitch 0160mm 350mm good elevator has little twist 2mm enough 5Engine 12g FAI rubber 6 x /24 x %2 flight undercarriage 8 x A4 x Y32 ROG CL Scale/Boss Continued page 79 touch-and-go taxi lap retract extend landing gear Because flight portion event counts half total score importance choos ing model good flying characteristics will readily apparent course capability experience person holding control han dle play large part success failure model flight key word pracrice point might worthwhile inject extra thought flight portion event Much has said past about military fighter multiengine models having advan tage over less sophisticated civilian-type air craft during flight portion competition dont think thats entirely true because aircraft basically simple de signs yet compete effectively against phisticated types simplest subjects judged four obligatory maneuvers finding maneu vers fill out six optional selections can chosen options listed AMA FAI Scale rules should present little difficulty Most models capable taxiing two options performing touch-and-go two options engine control engine cutoff option Thats five six options needed last option could depending subject modeled operation wing flaps crop dusting other similar maneuver summary should choose model can documented both Accuracy Outline Finish Color Markings has neces sary features options filling out flight plan has good flight characteristics youre careful selecting subject gath ering data youre able fill out flight plan well learn flight characteris tics model youll rewarded K NARROW BAID V SITS A9 84Computer Ingenuity Intended serious flyer PCM 9 offers few compromises wfth some novative features have changed standards radio systems will judged transmftter hasthe lookandfeelofahigh performance no nonsense piece equipment control sticks supported two ball bearings axis ot movement adjustable length Frequencies can quickly changed swapping modules servo direction travel adjustable nine channels direct servo controller allows operation radio ground someone else uses same frequency Both pattern helicopter versions have programmable fail safe systems use 1991 ready PCM ABC&W receivers Both versions come wTh four 4001 servos rechargeable transmitter airborne batteries full servo mounting hardware swch harness Available now through ic,flJllCSw local hobby dealer yesterdays prices Distributed Hobby Dynamics Distributors e 1-800-458-0241 PO Box 3726 Champaign IL 61826-3 72 6 1-217-355-0058 October 1989 179 Analog Flexibility
Edition: Model Aviation - 1989/10
Page Numbers: 76, 77, 78, 176, 178, 179
Rubber Scale flight alive well Czechoslovakia P-51 H excellent example developmental end point Mustangs evolution its pretty lines larger wings tail H variant makes perfect modeling subject its characteristi cally dependable stable flight thank Bill Warner help getting publishable state ELubomir Koutny About author Lubomir Koutny known throughout world modeling community accomplished designers fliers anywhere has years experience fields rubber-powered aircraft Today Czechoslovakia Peanut Scale A0-scale rage lat ter being mostly planes World War II due clean configurations high per formance potential P-SJH finest all-around Rubber Scale models 1A0 class representative fine work being done today Czechoslo vakia THE FINAL production variant leg endary Mustang fighter P-51H also fastest line World War II aircraft Although came along too late take part European operations few did see action against Japan closing days war As modeling subject de velopmental end point Mustang fighter series has distinct advantages over P-5 1 D larger tail simplified under76 Model Aviation Big picture Mr Koutny has built several P-51H models various sizes structural tech niques plane pictured original model plan depicts built 1980 o scale model has wingspan 570mm weighs 48 grams version has re corded up 70-second flights Above author seen displaying original P-51H Full-Size Plans Available Page 196 O 110 MB BALSA SPARz o MB BALSA SPARE7H5 MM BALSA CE TAPERS TO 23MMTAPERS TO 213 MBTAPERS TO 4R MUSUM BALSA SHEET DUB BALSA 1 TIP ~ .jWIGAN PAP H AILERON PAPER TABESLIART ACETATE HOE Er2 ES MU PAPERTAILAREEL APTIOBAR 15 BB BALSA SHEET2B MBft-- ABOAET E ABOVE 00 IIRIB IIII CE FRAUTE PROW PATTERS FOR DARTISS AlSO RBS BARE PROW PO CE EROB BELOW t015 BM BALSA TE EROB K. Ff7 RftBB BALSASTABlERLINES BR BALSAOREET B 65w 7 FORBERS 2 TRW B 7 THRA ARE MB BALSA SHEET S H S ARE 2MM IBM C GROOR25MMRIO BAMBOO PROP BLADE -POWER2 LOAPS OF BOBBER 700 MM IORILHNG TORUS AOA EHRAOST PORTSPLIGHT TIRE70 SECOURS REISUTAOS MODEL AVIATION HISS TOP B BOTTOMMUSTANG P 51 H BAUD PAPERI/DO SCALE RUBBER POWERED 5B RBCOLAP SCKERAE OVERALL SILOER-AREY BLADE PROPDESIGNED BY LOBOMIR KOVYNY B5S11TBFUSELAGEFRONTBLADES SCARE PASELDRAWN BY PETR MIIGULASEK O3B2EPEGROUSE TRIM AS SHORS________________________________ PAPERTRACING VIEW0 EM AR CO YROREBY carriage smaller wheels lowdrag wing An excellent model P-51H has flown successfully Czech modelers other A0-scale ships confined model box due bad winds Though its recommended begin ners constructing warbird wont too difficult have built few Scale models Choosing right balsa light strong using light glue will result flying weight exceeding 50 grams model has wingspan 22 3/4 should translate favorably light wing loading Wing ribs made A2 C-grain balsa sheet Use stacking method wish procedure root rib tip rib made hard material placed opposite sides stack A2 blanks held together couple pins Planing sanding down until match either end produces evenly tapered sizes between blanks will require minor finishing before installation Slots two top two bottom spars /6-sq hard balsa can sanded stack still joined Note notch sanded rib attach ment point trailing edge plan An easier lighter wing construction method sliced rib technique shown plan After making pattern thin plywood plastic aluminum sheet shown slice both upper lower por tions rib /16 sheet trim indicated lengths Note lower surface wing flat Block up rear rib little trailing edge will follow downward curve attached leading edge tapered will above building board due upward curve front rib Wash out recommended can built raising wing tip bit trailing edge during construction stable glide can accomplished slimming down airfoil right wing slightly choice dihedral angle deter mined youre going fly mod el flying wheels-down indoors will require little dihedral shown An outdoor model flown gear up should have 1% l4 dihedral Fuselage An on-the-half-shell construc October 1989 77 Pictured its bare bones Mr Koutnys latest version line Mustangs air plane has sheeted fuselage front strength realism wing spars built up sliced-rib construction used ribs well stabilizer tar weight reduction tion method used Pin down upper lower /16 sheet keels cut A2 sheet bulkheads half vertically cement left side halves place perpendicular plan locations shown left side outline keel cut /16 sheet glued allowed dry Remove left-half fuselage assembly board install right halves bulkheads Add right side outline keel piece basic fuselage ready receive stringers stringers sliced strong medium-weight balsa Soft material will al low stringers pull between bulk heads giving starved-horse effect Use A0 sheet slice stringers follow ing curve fuselage best re sults tapering A0-sq nose A0 x A2 tail save weight stringers glued top bulk head formers rather fitted notches quite closely spaced about /6 give fuller realistic look still retaining lightness Standard straight stringers used tend distort fuselage Dont add bottom stringers until after wings attached radiator block carved very light balsa installed after model has covered front end fuselage can sheeted extra realism strength shown latest version model Tail Use lightest strongest balsa can find Pin wood down plastic wrap avoid its sticking plan Note airfoil sanded top stabilizer tail surfaces may also made /16 sheet desired Undercarriage Make landing gear de tachable plugging built-in paper tubes wing model looks flies better gear dangling down Make wheels soft balsa Styro foam small rolled-paper tubes through centers axle bearings Propeller Cut four blades strong Cgrain %2 sheet Glue bamboo axes Sand airfoil section Clark Y twist blades using hot iron can also made three laminations /32 sheet formed over molding block Finish blades nitrate dope Czechoslovaki modelers find spray used shoe re pairing does excellent job use poly styrene around wire hook prop shaft 2 Take care carving nose block spinner assembly ensure good fit Make sure paper tube blade inserts stalled straight keep blades wob bling Dont glue bamboo blade stubs solidly until after flight testing has fin ished3 Note circular plywood ramp freewheeling inside spinner should 1 0 right 20 left downthrust built nose block Covering Use either Japanese tissue lightness lightest grade Modelspan greater realism Japanese Sakai silver tis sue works well Cover model carefully finish well-thinned nitrate dope Finishing solid color such Humbrol line adds weight also enhances realism should applied sparingly airbrush Remember silver finish accentuates construction 78 Model Aviation Mr Koutny isnt building rubber-powered P-51H Mus tangs Czechoslovakia left Radek Koval shows off P 51H featuring solid rib construction all-sheet tail surface airplane dates back 1973 Above P-51J variant built Ivo Ceresnak 1975 Note different cockpit exhaust stack configuration flew well despite its heavy sprayed-silver paint job Continued page 176 Details propeller nose block hook landing gear undercarriage legs con structed bamboo epoxied aluminum yoke Styrofoam wheels landing gear legs plug paper tubes built wings order facilitate removal flying prop blades plug paper tubes built spinner bamboo stems may have adlusted get best flight performance before being permanently glued place close up nose block/spinner shows Czech hook encased trans parent plastic Its purpose may best de scribed Mr Koutnys own words Make Czech hook axis polystyrene better opposite some cordon needed perfect rubber prop work ing Its left reader figure out r Mystery Products little-known facts about two well-known products should help take mystery out modeling projects FLEXA Ideal non-porous materials fiber glass Use sparingly plywood fiberglass dont use Zip-Kicker Results tremendous bonding power just wont vibrate loose no stronger formula available anywhere POLS ZATh Adheres plastic surface including Lexan other modern plastics Also glue canopies fogging Use couple drops just little Zip-Kickertm esellent results HE ~CY- / ADHESIVE SYsTEM POce Tech Californd USA backyard fence since repaired it ready again test under power felt go Wright Field contest get some experience already pre-entered NFFS/US Outdoor Champs held couple weeks Lawrenceville IL son-in-law arrived contest site about 1100 am. now decided going watch ran old friend Harry Murphy made go get plane said would probably would fly introduced some flying friends looked over plane commented about several strange novations said plane appeared legal flightworthy -Although extremely nervous did some thing irrational decided fly plane suggested put prop backwards some technical reasons did Harry helped get DT fuse correctly align tail section After having some trouble engine fi nally started Now really nervous un hooked battery got ready launch Zeek mind blank tossed plane air took off low half-circle right other contestants finally climbed little surprise gained altitude fast -As proudly watched fly several sec onds Harry asked set timer No Did light DT fuse No Meanwhile Zeek proudly roared higher higher way Harry commented large fuel tank thoughtfully filled very top Now Harry also panicked jumped motorbike told get car drive around outside field quickly headed downwind south took about 10 minutes get outside base around downwind fence get parked start looking plane spotted Harry riding towards motorbike stopped temporarily stuck something finally got going again rode up fence noticed gotten mud over pants told plane OK gotten stuck mud plane run out gas stalled badly came down pretty quickly got lost going back ended up taking lap around base About 15 minutes later got back plane OK Harry going have cleanine bill Harry said planes CO right move forward already holes got out tools moved engine ward about half-inch ready fly again Also Harry gave bigger prop stalled backwards another test flight think Harry may have lost some confidence because suggested move away cars little bit Several guys made sug gestions about launch wind light fuse start timer guy said seen guys forget otherbut both engine started lot quicker time tried light fuse wind off prop blew out lighter thought heck set timer away went upwind did couple twists timer shut engine off made few circles glide made nice three-point landing about quarter mile away Harry asked about fuse ex plained did work Another lesson gave piece clothesline rope keep burning light DT fuse can blow out ready flight number three put prop right way power set timer longer engine run started engine lit fuse let Zeek go noticed wind changed set off downwind again went pretty well again DT did work circled around headed other fliers Everyone started duck ing made another three-point landing middle contestants area No hurt ready flight four did everything right time flew greatstraight up high timer shut off 10 seconds Zeek circled down glided perfectly landed about 300 ards away DTd about six feet off ground shorten fuse ready flight five flight super flew high fast staying up forever praying OT pop up Shortly thereafter did pop Zeek fell gently ground made day guys congratulated good plane good flight felt like Free Flighter packed up called day watched Harry fly Pee Wee 30 brand-new some problems after two flights made some adjustments called timer got maximum flight thought would never come down get bike go about quarter-mile get Success could leave well enough alone Now expert decided make another flight did everything right sent up rolled over powered ground broken wing tip some nose damage resulted Well back reality guys said got initia tion got feet wet welcomed club wished good luck packed up quite confident before lot smarter experienced few hours earlier am looking forward next contest headed home 53-year-old Free Flight rookie Les Hallgarth June 4 1989 says doesnt thats about time See ya downwind P-51 B/Koutny Con finued page 78 flaws Though P-51H has flown racer boys prefer build warbird Cockpit panel drawn photocopied instruments pilot radio can added extra realism canopy can made thin 03mm acetate sheet heated frame before pressing shaped cockpit mold Flight trimming Check wing washout adjust necessary original model trimmed fly left-left re quired about s up elevator4 rudder bent slightly left As model turn ing left left wing should have little less washout right order crease its lift slightly Make sure thrust line 20 40 down 10 right Rubber original model flown vintage 1972 Pirelli subsequent edi tions have flown successfully Alfa Continued page 178 176 Model Aviation Stack f Immediate Slat paaaent ZEMOAH G-62 37 Cu In $26495 ZENOAN G-23 96 ZENOAM 038 $17896 SACHI 28 TCA 838000 SACHS 32 TCA 50 SACHS 37 CDI 00 SACIlS 37 TCA 00 SACHS 58 CDI 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poorquality Filati times between 60 75 seconds dead air big prop helps keep model flying away Straight castor oil used lubricant using Sig contest rubber FAI rubber might start three loops 3mm %2 about 28 long5 great deal depends models weight pitch its propeller blades Flying Check balance point make sure center-of-gravity shown plan line front cockpit isnt correct add weight nose tail bring airplane balance Try test glide high grass aiming nose slightly downward well model should glide about 12 yards straight line gentle left turn stalls dives check rubber position see its bunching up shifting center-of-gravity Give rubber about 250 turns maiden flight model should fly gently leftward perhaps climb little stalls nose goes up too much under power falls put little downthrust adding thin shim between top nose block nose flight satisfactory boost power 500 turns model should climb left glide left climbs first half circle de scends second half add wash out right wing additional test glides Once glide acceptable can move up 800 1000 turns fly big torque moment airplane should climb easily over 150-ft altitude Make minor corrections between flights never attempt adjustment time P-51H excellent flier will give consistent results invite write questions comments Ing Lubomir Koutny Zahrebska 33 61600 Brno Czechoslovakia Good luck competent dependable Scale model reader preparing above text faced problem conveying Mr Koutnys words well could Al though English infinitely better 178 Model Aviation THE PIPER BRAVE e 1/4 scale model Piper s latest Ag plane e 10 ft wing span e 30-33 lbs e 50-75 cc power e 5-10 lb payload e Operational flaps hopper door e Optional Spreader Kit e Pre-formed aluminum landing gear e Fiberglass cowls Vacuum-formed canopy e Constucted extruded foam ply hardwood e smoker l ISBRAVE $269~OPTIONAL SEND $100 FOR CATALOG OFQ 4/7RT 1 NEODESHA KS 66757 SAC KITS AND ACCESSORIES316 325-2821 Free Shipping Kit OrdersScott Airplane CompanyVISA/MASTERCARD Czech much will less crystal-clear average modeler apol ogize verbal inadequacies urge builder carefully examine model photos plan help clarify things may also write Mr Koutny ques tions tell him about model Bill Warner Footnotes following notes pre sented Mr Koutnys exact words al low various interpretations better gliding stability good right half wing tip has some slimmer aerofoil opposite left 2 Make Czech hook axis poly styrene better opposite some cor don needed perfect rubber prop working pattern correct blade angles adjustment pitch 0160mm 350mm good elevator has little twist 2mm enough 5Engine 12g FAI rubber 6 x /24 x %2 flight undercarriage 8 x A4 x Y32 ROG CL Scale/Boss Continued page 79 touch-and-go taxi lap retract extend landing gear Because flight portion event counts half total score importance choos ing model good flying characteristics will readily apparent course capability experience person holding control han dle play large part success failure model flight key word pracrice point might worthwhile inject extra thought flight portion event Much has said past about military fighter multiengine models having advan tage over less sophisticated civilian-type air craft during flight portion competition dont think thats entirely true because aircraft basically simple de signs yet compete effectively against phisticated types simplest subjects judged four obligatory maneuvers finding maneu vers fill out six optional selections can chosen options listed AMA FAI Scale rules should present little difficulty Most models capable taxiing two options performing touch-and-go two options engine control engine cutoff option Thats five six options needed last option could depending subject modeled operation wing flaps crop dusting other similar maneuver summary should choose model can documented both Accuracy Outline Finish Color Markings has neces sary features options filling out flight plan has good flight characteristics youre careful selecting subject gath ering data youre able fill out flight plan well learn flight characteris tics model youll rewarded K NARROW BAID V SITS A9 84Computer Ingenuity Intended serious flyer PCM 9 offers few compromises wfth some novative features have changed standards radio systems will judged transmftter hasthe lookandfeelofahigh performance no nonsense piece equipment control sticks supported two ball bearings axis ot movement adjustable length Frequencies can quickly changed swapping modules servo direction travel adjustable nine channels direct servo controller allows operation radio ground someone else uses same frequency Both pattern helicopter versions have programmable fail safe systems use 1991 ready PCM ABC&W receivers Both versions come wTh four 4001 servos rechargeable transmitter airborne batteries full servo mounting hardware swch harness Available now through ic,flJllCSw local hobby dealer yesterdays prices Distributed Hobby Dynamics Distributors e 1-800-458-0241 PO Box 3726 Champaign IL 61826-3 72 6 1-217-355-0058 October 1989 179 Analog Flexibility