Radio Control: Scale

Radio Control SCALE Bob & Dolly Wischer COOLING PROBLEMS subject ducted cooling model engines has touched upon past column July 1981 questions received recently lead us believe previous discussions specific enough Summertime overheating recent meets also emphasizes need detailed informa mm Engine cowl detail Bobs Piel Emeraude model left top cowl has removed show HP 60 dummy Continental cylinder baffle behind 010 aluminum baffle keeps incoming air taking easy way through cowlforces around HPs vitals right horizontal shelfjust inside cowl opening can seen clearlyit too keeps incoming airfrom taking easy path outthe bottom cowl instead around hot engine Swedens Roy Nilison built fantastic DH Tiger Moth flew atthe Reno World Championships second higheststatic score Class F4C Its weathered finish represented well-used airplane interior shot cowl shows OS FS-60 4-stroke engine duct leading down monstrous muffler Note weathered aged oil tank detail well accurately-duplicated strut ends inspection plates does anyone get up enough nerve fly model like first time Has scale prop too 44 Model Aviation Stand-Off Scale Italys Carlo Mapelli placed 3rd Reno 1/4-scale Corben BabyAce Note detailed Continentalengine spark plugs push rods exhaust pipes clearly visible accurately-made landing gear complete shock cords tion Cooling cowled engine mounted behind dummy radial engine relatively simple Dummy half-cylinders mounted 1/16 plywood disc completely fills open ing cowl front model engine mounted such position cylinder center line falls between two dummy cylinders purposes will angle left viewed front engine exhaust will downward angle facilitates mounting muffler near cowl bottom also aids lowering needle valve relative fuel tank center line nine-cylinder dummy radial position favor would about 1400 between cylinders 4 5 counterclockwise top places model engine sidemounted its cylinder 500 below horizontal 100 below model engine placed between cylinders 3 4 plywood disc cut away between cylinders 4 5 trapped air can flow rearward opening will permit sufficient airflow cool 60 90 engine Two 1/32 plywood plates fastened vertically gussets rear ply disc such position rest directly against model engines cylinder fins reaching back approximate cylinder center line plates form box cowl interior surface incoming air forced flow through fins over cylinder head small portion air lost because side plates cant made fit snugly around engine crankcase air enters cowl front can exit through opening disc pres surized air exits around cylinder fins its velocity increased venturi opening disc doesnt need larger area fin space around cylinder head will take sharp eye viewing directly front see model engine Admittedly blocking complete cowl interior increases drag prop blades near hub ineffectual additional drag traded off engine cooling practical expedient larger diameter prop can used necessary model engines using layout typical present designs having carburetor front ball bearings spaced apart distance model engine ply disc will dictate shaft extension may necessary par ticularly true dummy engine ply disc recessed cowl front true scale Continued page 122 40 ENGINE $19500 Plus Shippiftg Kit includes pre-assembled flywheel drive gear starter hub unit K&B 40 state other pre-cut left- right-hand props canoe parts moulded head hands Wilbur poster plans much Build 1905 prototype Signal Corps Flyeror Type GEORGE MARSOEN 7621 Mary Cassatt Drive Potomac Md 20854 December 1982 45 shot shows interesting details construction techniques well HP 50 engine installation Bobs Douglas Mailpiane right plywood baffl hugs cylinder does thats Out sight under muffler third baffle fastened cowl top removed photo fits head glow plug tightly WRIGHT FLYER Ill 1 SPORT SCALE Water cooled cogged belt drive coupled wing-warp/rudder THREE CHANNELS LEADER IN SMALL AIRFOIL TECHNOLOGY MAStER AIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE GIF SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 PRESENTS BALSA STRIPPER A95 U AT YOUR DEALER PRECISION STRIP WOOD TO x INS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOL T PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 RC Aerobatics/Van Putte Continued page 43 survive airplane should complete roll 1 conds get friend time because will probably too excited get accurate measurement rolls faster youll have trouble putting necessary elevator inputs right time rolls much slower three rolls will strung out too long Adjust aileron throw get roll rate correct before attempting roll After youre satisfied roll rate try three rolls using elevator sure start Out high altitude airplane travel ing horizontally will need use elevator perform three good rolls reason trying three rolls elevator input get idea much elevator will required keep flight path horizontal Some airplanes require lot elevator input others require very little airplane finishes three rolls pointed severely down can plan needing lot elevator input Whether little lot elevator input required keep airplane flight path horizon tal trick doing good-looking rolls avoiding sudden elevator inputs Try doing three rolls holding hard-over aileron blending some down elevator about450 before airplane upside-down taking out about 450 after Start putting some up elevator about 450 before airplane upright start taking out about 450 after get through three rolls dont look too bad congratula tionsnow youre way airplane lost altitude during rolls need increase amount elevator input Conversely climb during rolls means need reduce amount elevator input roll airplane right clockwise viewed rear airplane air plane veers off right means putting elevator control too late course will opposite left-hand rollers Cor respondingly veers off left righthand rollers youre putting elevator control too early stop rolling must neutralized aileron input Just take out aileron input different airplane will have experiment yours find out whats right airplanes very close time wings pass through horizontal After get used performing three rolls II wonder ever thought difficult Remember key good-looking rolls smooth application elevator over sub stantial fraction roll work II able make look like airplane string Good luck interest promoting new technical advances thought following article RC Elite Lines newsletter West Shore Flying Society Lemoyne PA deserved reprint ing went follows New Products Depart mentWhat sophisticated radios reversal switches couplers etc bound happen Charlie Fries now has proto type circuit connects ON-OFF switch connected transmitter allows trim ON-OFF switch Full ON Full OFFor degree between Thus save battery drain will knock someone partially Out sky placed receiver unwanted signals blocked can fly perfect flight time placed both transmitter receiver airborne unit can trimmed coupling reversal feedback person hold ing transmitter crashes airplane flies back forth over area searching pilot Charlie now taking orders first-comefirst-served basis Shipping will begain soon FCC gives frequency slot FAA con ducts tests IRS issues tax opinion AMA sanctions event meets insurance coverage hints $5 information brochure will held escrow Charlies account gaining interest until above-named bodies act favorably shipping will start maybe Keep cards letters coming Send good pictures too Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Scale/Wischers Continued page 45 position have seen dummy engines deeply recessed mounted close cowl front avoid using shaft extension question detrimental effect scale appearance Its choice will have made during construction Fastening plywood disc dummy engine cowl last assembly steps completing model Most cowls taper inward toward front disc diameter will vary depending upon its position fore aft ThereContinued page 124 1/8 SPORT SCALE PLANS 72 WING SPAN DESIGNED FOR SINGLE 40-45 SCHNEURLE ENGINE PRICE $1950 BOX 54 RESEDA CA 91335 122 Model Aviation Weve got 22 really beautiful designs VOGEL AVIATION SflDEL DIV THE SAILPLANE CADDY Only Lift Money Can Buy Write free brochure SPO transports sailplanes 2M open class superships fantastic tool gets field/slope easy lift Furniture quality parts precut 1/2 maple plywood Dado cuts ensure quick & accurate joints thac very strong hooks screws & strap supplied kitWHALE SALE V Send $ 2995 AMA # pay postage via WHALE HOBBIES INC 1201 UCOUFFIE NO 104 HOUSTON TEXAS77019 713 529-3152 Offer good until 1/12/1983 Kits Epoxyglass Mr Gs Products & Supply 1010 Gratiot ox 161 Marysville Michigan I0O 1-31 3-36-8875 ore decision whether use shaft extension should made early construction Shaft extensions various diameters lengths available Fox Manufacturing Co elected use shaft extension order set dummy engine near its scale position must also kept mind means flying propellers will need drilled out accept large-diameter prop nut/sleeve used extension Aircraft flat four- six-cylinder engines usually have large two small ventilation openings cowl front Models planes will usually have side-mounted engine would place cylinder behind open ing left side nothing done pre vent incoming air would take easy route through cowl open right side engine cooling would suffer reason block right opening aluminum plywood plate point will rest against engine crankcase plate later covered dummy cylinder simulate Lycoming Continental engine Air entering right side diverted over left Full-size aircraft type cowl have shelf just inside opening extending full width completely fills space between openings lower edge engine forces incoming air upward rear cooling rear cylinders cylinder cool problem simplified shelf necessity models also block exit air downward shelf extends rearward until makes contact cylinder litho-plate aluminum shelf supported plywood form er cemented cowl bottom gap between cylinder inner surface cowl top should also filled litho-plate ply baffle close prox imity fins manner make certain bit entering air forced over cylinder head will some loss due spill air through gaps around crankcase air will its job loss isnt bad crankcase needs some cooling also Heated air engine has expanded requires exit somewhat larger disc cowl opening However some ways accelerating air out exit radialengined planes WW II controllable cooling gills form another will needed model also difference being cant closed after takeoff prototype could partially closed during flight modeler clever enough stand Out slipstream drop pressure behind pulls air forcefully out cowl slight downward-formed edge exhaust air opening light planes serves same purpose feature accelerate air smaller cowl opening can used equivalent larger exit Models prototypes have liquid-cooled engines difficult cool introducing visible non-scale openings Antiques large radiators front no problem Its WW II types remote radiators under wing fuselage belly awkward cool properly Never having modeled selves can describe others methods George Roses Curtiss Hawk P-6E has small plate folds down admit incoming air cowl front plate remains part model whether its down upand thereby circum vents rule states nothing can added removed after static judging contest Mick Reeves Spitfire ducts air small scoop lower cowl surface Neither examples has large opening air must used frugally installing baffling around cylinder head Douglas Mailplane has large radiator behind prop presents capacious opening entering air Baffles brought close cylinder cowl sides andtop flow air through cowl restricted Air vented out cowl interior through 170 individual punched louvers aluminum sides top louver openings very large measuring about 1/16-in x 7A-in multiplied 170 openings total area over 9 sq compared approximate 2 sq area between baffles engine cylinder louver total area about three times what really needed However baffles cooling HP 60 marginal under normal weather condi tionsand problem hot weather Louvers propeller slipstream have same advantage evacuating air cooling gills radial engine cowls accelerate air through openings reason pressure differ ence results louvers acting airfoil military colors two commonly used WW II Navy colors Sea Blue Intermediate Blue latest mixture formulae released Pettit Paint Corp makers Hobby poxy Products two colors addition Olive Drab Neutral Gray described find way Bob Karlsson uses spring-loaded October 1982 column now make possible cooling gills Wildcat actuated paint ever-popular WW II military aircraft slipstream slow speed held open accurate hues spring Gills quite effective because they Continued page 126 124 Model Aviation Lake Buccaneer$25000 Grumman WidgeonS3000O PRY 5 catalInaS00O0 Republic Seahee$19500 qsiM7 Everyone Wears T-Shirt Buy Best Custom Screen Sportswr Coaches shirtsS1295 Ladies tops$ 995 Jackets$2195 Baseball shirts$ 895 Shorts$ 595 Sweatshirts$1195 Football jerseys $ 895 T-Shirts$ 695 HatsAsk Details Send SASE BrochureDirect Print Sportswear eat Transferl Order Designs Shown Wide Choice Colors Time X-Mas s XS S M L XL Ask About club Rates Special Event & Personalized Shirts Send check money order Include 10% postagehandling Phase Art T-Shirt people INDO RM DELPLY ENDURANCE RUBBER IVIODELS THE EASY BTHE TIME MACHINE PENNY 18 Span 1/8 OZ PING FLYER3 PARLOR PLANES 24 Spa5 OZS Span 2PARLORTHE SLOWPOKE SF COPTERS 2Span5495 95 * ** STARSHIP 2YadB dsaFo SzePsns Fu SzePopJg Pcue ustated Ut L ght Bass M n Bes nO %395*$3 95 M C 0 WaSheS ape Rubbe Wi 20 oZ * slos * L 135 * * STARSHIP $100 Williams Book $20 Order INDOOR MODEL AIRPLANES Ron Williams 264 Pgs Over 200 illustratIonS plus 2 FREE Full Size Plan Sheets tar lMS Easy B 95 INDOOR MODEL AIRPLANES Law Gitiow 46 Pas & Over 100 itustratIons reprint. 5 PEA N UT POWER Hannan 80 Pgs $895 INDOOR BALSA $695 P-NUT BALSA PACK $695 JAPANESE TISSUE 6 Cobra 12 Pack $350Roll 10 large $595 ROLL OF MICROLITE COVERING $325 CONDENSER PAPER $250WASHERS $150 RUBBER LUBE $150CEMENT $150 THRUST BEARING New Tiny 60 New Dual 100 NEW MARK 1 WINDERS161________$1195 NEW SMOOTHIE WiNDERS6l_______$395 81 Winder $195 $25 Order ALL ORDERS & KITS ADD 10% POSTAGE MInimum postage $150 16 PG CATALOG $100 DOX C OARDERVILLE CA 95440 -a-S 4 SAD 4 2 Earlham Ct Upper Marlboro Md 20772 J Sea Blue FS 35402 upper surfaces Navy planes including Corsairs Hellcats etc uses Hobbypoxy standard products mixed formula 3 parts H8 1 Black 2 parts H3 3 Stinson Green 1 part H24 Dark Blue Intermediate Blue FS 35164 used combination Sea Blue early WW II three-color camouflage schemes formula 4 parts H70 Gray 3 parts H66 Dark Red 1 part H24 Dark Blue proportions intended mixing Hobbypoxy epoxy standard enamel colors Mixing colors other products will guarantee same results proper degree non-gloss finish above mixtures should have equal quantity Part B Flat Hardener added Stand-OtTvs Precision number entrants recent Reno World Championships International Competition held important signif icance us first world meet Stand-Off entries outnumbered Precision F4C may very well have spelled demise latter strong movement afoot combine two classes under FAI As quality Precision-class models im proved past number Scale modelers willing expend tremendous effort pro duction has decreased top models F4C builders have come regarded rare holdovers past era Lincoln Nats quantity Precision Scale entries diminished two Stand-Off Scale has taken over almost entirely contest scene parallel movement model quality also seen class winning models already approach ing F4C detail craftsmanship Does wide disparity quality breed discontent retards competitive urge could see general reduction contest attendance world-class competition maximum pos sible static score 3250 both Stand-Off F4C Reno Terry Melleneys Moth Minor F4C higher static score best Stand-Off model Mick Reeves ill-fated Spitfire Average score top six places 150 points higher Stand-Off F4C Stand-Off class first six static scores bunched within 128 points F4C first six separated 497 points tells us something about quality judging two classes degree difficulty judging Precision models too great over burdened judges smothered task closely grouped Stand-Off scores real istic would appear five Stand-Off judges easier find betteriob 1/5th time Examples ofthe inequalities occur static judging seen scores well-known air planes appear unchanged World Cham pionships repeatedly Melleneys Moth Minor 1980 received static score 2352its lowest four meets Reno its score jumped 2836 George Rose Hawk P-6E score 2415 1980 slumped slow 1845 Reno Jean Rousseaus CAP-20 dropped 2659 2249 dramatic drop 2482 1910 Jack Swifts RV-3 pilot abilities being nearly equal static scores determine winners Anyone enters competition judged event must know risks involved dictate final placement Chance plays important part willing have efforts judged persons doubtful qualifications can elude risk flying masterpieces Scale Rallies increasing popularity Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss Continued page 47 tasks Ten top 15 averaged under 30 seconds seven Speed flights best average seven Speed tasks Dick Odles 27 seconds Alex Bowers 199 good average would have around 245 seconds six-flight average 253 Consistency Mark Smith averaged 549 seven Duration flights landings averaged 971 points Jolly Watson Bower consistent Distance seven-flight averages 1128 110 1086 laps respec tively Steve Work highest-score throwaway round 24572 points Highest single-round score Bowers 29243 fourth Smith five 1000-point tasks Bower seven Edberg four Jolly six Too fliers lost precious working-time retriving models relaunch contrast to appreciate superb teamwork Jolly Mark Smith Skip Miller would catch models fly reposition hand relaunch back up toweach accomplished feat four seconds As mentioned beginning column Competition Newsletter presents details contest along some interesting side lights Whether youre international compe tition F3B can proud new USA team Theyre three different types individuals three different types Sailplanesbut have common goal Lets support can reach Dan Pruss 131 E Pennington Lane Plainfield IL 60544 SAFE FLYING IS NO ACCIDENT 126 Model Aviation FLYIN6 IS RUSOES BE FLYING K jolt f IN U A

Radio Control SCALE Bob & Dolly Wischer COOLING PROBLEMS subject ducted cooling model engines has touched upon past column July 1981 questions received recently lead us believe previous discussions specific enough Summertime overheating recent meets also emphasizes need detailed informa mm Engine cowl detail Bobs Piel Emeraude model left top cowl has removed show HP 60 dummy Continental cylinder baffle behind 010 aluminum baffle keeps incoming air taking easy way through cowlforces around HPs vitals right horizontal shelfjust inside cowl opening can seen clearlyit too keeps incoming airfrom taking easy path outthe bottom cowl instead around hot engine Swedens Roy Nilison built fantastic DH Tiger Moth flew atthe Reno World Championships second higheststatic score Class F4C Its weathered finish represented well-used airplane interior shot cowl shows OS FS-60 4-stroke engine duct leading down monstrous muffler Note weathered aged oil tank detail well accurately-duplicated strut ends inspection plates does anyone get up enough nerve fly model like first time Has scale prop too 44 Model Aviation Stand-Off Scale Italys Carlo Mapelli placed 3rd Reno 1/4-scale Corben BabyAce Note detailed Continentalengine spark plugs push rods exhaust pipes clearly visible accurately-made landing gear complete shock cords tion Cooling cowled engine mounted behind dummy radial engine relatively simple Dummy half-cylinders mounted 1/16 plywood disc completely fills open ing cowl front model engine mounted such position cylinder center line falls between two dummy cylinders purposes will angle left viewed front engine exhaust will downward angle facilitates mounting muffler near cowl bottom also aids lowering needle valve relative fuel tank center line nine-cylinder dummy radial position favor would about 1400 between cylinders 4 5 counterclockwise top places model engine sidemounted its cylinder 500 below horizontal 100 below model engine placed between cylinders 3 4 plywood disc cut away between cylinders 4 5 trapped air can flow rearward opening will permit sufficient airflow cool 60 90 engine Two 1/32 plywood plates fastened vertically gussets rear ply disc such position rest directly against model engines cylinder fins reaching back approximate cylinder center line plates form box cowl interior surface incoming air forced flow through fins over cylinder head small portion air lost because side plates cant made fit snugly around engine crankcase air enters cowl front can exit through opening disc pres surized air exits around cylinder fins its velocity increased venturi opening disc doesnt need larger area fin space around cylinder head will take sharp eye viewing directly front see model engine Admittedly blocking complete cowl interior increases drag prop blades near hub ineffectual additional drag traded off engine cooling practical expedient larger diameter prop can used necessary model engines using layout typical present designs having carburetor front ball bearings spaced apart distance model engine ply disc will dictate shaft extension may necessary par ticularly true dummy engine ply disc recessed cowl front true scale Continued page 122 40 ENGINE $19500 Plus Shippiftg Kit includes pre-assembled flywheel drive gear starter hub unit K&B 40 state other pre-cut left- right-hand props canoe parts moulded head hands Wilbur poster plans much Build 1905 prototype Signal Corps Flyeror Type GEORGE MARSOEN 7621 Mary Cassatt Drive Potomac Md 20854 December 1982 45 shot shows interesting details construction techniques well HP 50 engine installation Bobs Douglas Mailpiane right plywood baffl hugs cylinder does thats Out sight under muffler third baffle fastened cowl top removed photo fits head glow plug tightly WRIGHT FLYER Ill 1 SPORT SCALE Water cooled cogged belt drive coupled wing-warp/rudder THREE CHANNELS LEADER IN SMALL AIRFOIL TECHNOLOGY MAStER AIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE GIF SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct Santa Rosa CA 95401 PRESENTS BALSA STRIPPER A95 U AT YOUR DEALER PRECISION STRIP WOOD TO x INS FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOL T PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 RC Aerobatics/Van Putte Continued page 43 survive airplane should complete roll 1 conds get friend time because will probably too excited get accurate measurement rolls faster youll have trouble putting necessary elevator inputs right time rolls much slower three rolls will strung out too long Adjust aileron throw get roll rate correct before attempting roll After youre satisfied roll rate try three rolls using elevator sure start Out high altitude airplane travel ing horizontally will need use elevator perform three good rolls reason trying three rolls elevator input get idea much elevator will required keep flight path horizontal Some airplanes require lot elevator input others require very little airplane finishes three rolls pointed severely down can plan needing lot elevator input Whether little lot elevator input required keep airplane flight path horizon tal trick doing good-looking rolls avoiding sudden elevator inputs Try doing three rolls holding hard-over aileron blending some down elevator about450 before airplane upside-down taking out about 450 after Start putting some up elevator about 450 before airplane upright start taking out about 450 after get through three rolls dont look too bad congratula tionsnow youre way airplane lost altitude during rolls need increase amount elevator input Conversely climb during rolls means need reduce amount elevator input roll airplane right clockwise viewed rear airplane air plane veers off right means putting elevator control too late course will opposite left-hand rollers Cor respondingly veers off left righthand rollers youre putting elevator control too early stop rolling must neutralized aileron input Just take out aileron input different airplane will have experiment yours find out whats right airplanes very close time wings pass through horizontal After get used performing three rolls II wonder ever thought difficult Remember key good-looking rolls smooth application elevator over sub stantial fraction roll work II able make look like airplane string Good luck interest promoting new technical advances thought following article RC Elite Lines newsletter West Shore Flying Society Lemoyne PA deserved reprint ing went follows New Products Depart mentWhat sophisticated radios reversal switches couplers etc bound happen Charlie Fries now has proto type circuit connects ON-OFF switch connected transmitter allows trim ON-OFF switch Full ON Full OFFor degree between Thus save battery drain will knock someone partially Out sky placed receiver unwanted signals blocked can fly perfect flight time placed both transmitter receiver airborne unit can trimmed coupling reversal feedback person hold ing transmitter crashes airplane flies back forth over area searching pilot Charlie now taking orders first-comefirst-served basis Shipping will begain soon FCC gives frequency slot FAA con ducts tests IRS issues tax opinion AMA sanctions event meets insurance coverage hints $5 information brochure will held escrow Charlies account gaining interest until above-named bodies act favorably shipping will start maybe Keep cards letters coming Send good pictures too Ron Van Putte 111 Sleepy Oaks Rd Ft Walton Beach FL 32548 RC Scale/Wischers Continued page 45 position have seen dummy engines deeply recessed mounted close cowl front avoid using shaft extension question detrimental effect scale appearance Its choice will have made during construction Fastening plywood disc dummy engine cowl last assembly steps completing model Most cowls taper inward toward front disc diameter will vary depending upon its position fore aft ThereContinued page 124 1/8 SPORT SCALE PLANS 72 WING SPAN DESIGNED FOR SINGLE 40-45 SCHNEURLE ENGINE PRICE $1950 BOX 54 RESEDA CA 91335 122 Model Aviation Weve got 22 really beautiful designs VOGEL AVIATION SflDEL DIV THE SAILPLANE CADDY Only Lift Money Can Buy Write free brochure SPO transports sailplanes 2M open class superships fantastic tool gets field/slope easy lift Furniture quality parts precut 1/2 maple plywood Dado cuts ensure quick & accurate joints thac very strong hooks screws & strap supplied kitWHALE SALE V Send $ 2995 AMA # pay postage via WHALE HOBBIES INC 1201 UCOUFFIE NO 104 HOUSTON TEXAS77019 713 529-3152 Offer good until 1/12/1983 Kits Epoxyglass Mr Gs Products & Supply 1010 Gratiot ox 161 Marysville Michigan I0O 1-31 3-36-8875 ore decision whether use shaft extension should made early construction Shaft extensions various diameters lengths available Fox Manufacturing Co elected use shaft extension order set dummy engine near its scale position must also kept mind means flying propellers will need drilled out accept large-diameter prop nut/sleeve used extension Aircraft flat four- six-cylinder engines usually have large two small ventilation openings cowl front Models planes will usually have side-mounted engine would place cylinder behind open ing left side nothing done pre vent incoming air would take easy route through cowl open right side engine cooling would suffer reason block right opening aluminum plywood plate point will rest against engine crankcase plate later covered dummy cylinder simulate Lycoming Continental engine Air entering right side diverted over left Full-size aircraft type cowl have shelf just inside opening extending full width completely fills space between openings lower edge engine forces incoming air upward rear cooling rear cylinders cylinder cool problem simplified shelf necessity models also block exit air downward shelf extends rearward until makes contact cylinder litho-plate aluminum shelf supported plywood form er cemented cowl bottom gap between cylinder inner surface cowl top should also filled litho-plate ply baffle close prox imity fins manner make certain bit entering air forced over cylinder head will some loss due spill air through gaps around crankcase air will its job loss isnt bad crankcase needs some cooling also Heated air engine has expanded requires exit somewhat larger disc cowl opening However some ways accelerating air out exit radialengined planes WW II controllable cooling gills form another will needed model also difference being cant closed after takeoff prototype could partially closed during flight modeler clever enough stand Out slipstream drop pressure behind pulls air forcefully out cowl slight downward-formed edge exhaust air opening light planes serves same purpose feature accelerate air smaller cowl opening can used equivalent larger exit Models prototypes have liquid-cooled engines difficult cool introducing visible non-scale openings Antiques large radiators front no problem Its WW II types remote radiators under wing fuselage belly awkward cool properly Never having modeled selves can describe others methods George Roses Curtiss Hawk P-6E has small plate folds down admit incoming air cowl front plate remains part model whether its down upand thereby circum vents rule states nothing can added removed after static judging contest Mick Reeves Spitfire ducts air small scoop lower cowl surface Neither examples has large opening air must used frugally installing baffling around cylinder head Douglas Mailplane has large radiator behind prop presents capacious opening entering air Baffles brought close cylinder cowl sides andtop flow air through cowl restricted Air vented out cowl interior through 170 individual punched louvers aluminum sides top louver openings very large measuring about 1/16-in x 7A-in multiplied 170 openings total area over 9 sq compared approximate 2 sq area between baffles engine cylinder louver total area about three times what really needed However baffles cooling HP 60 marginal under normal weather condi tionsand problem hot weather Louvers propeller slipstream have same advantage evacuating air cooling gills radial engine cowls accelerate air through openings reason pressure differ ence results louvers acting airfoil military colors two commonly used WW II Navy colors Sea Blue Intermediate Blue latest mixture formulae released Pettit Paint Corp makers Hobby poxy Products two colors addition Olive Drab Neutral Gray described find way Bob Karlsson uses spring-loaded October 1982 column now make possible cooling gills Wildcat actuated paint ever-popular WW II military aircraft slipstream slow speed held open accurate hues spring Gills quite effective because they Continued page 126 124 Model Aviation Lake Buccaneer$25000 Grumman WidgeonS3000O PRY 5 catalInaS00O0 Republic Seahee$19500 qsiM7 Everyone Wears T-Shirt Buy Best Custom Screen Sportswr Coaches shirtsS1295 Ladies tops$ 995 Jackets$2195 Baseball shirts$ 895 Shorts$ 595 Sweatshirts$1195 Football jerseys $ 895 T-Shirts$ 695 HatsAsk Details Send SASE BrochureDirect Print Sportswear eat Transferl Order Designs Shown Wide Choice Colors Time X-Mas s XS S M L XL Ask About club Rates Special Event & Personalized Shirts Send check money order Include 10% postagehandling Phase Art T-Shirt people INDO RM DELPLY ENDURANCE RUBBER IVIODELS THE EASY BTHE TIME MACHINE PENNY 18 Span 1/8 OZ PING FLYER3 PARLOR PLANES 24 Spa5 OZS Span 2PARLORTHE SLOWPOKE SF COPTERS 2Span5495 95 * ** STARSHIP 2YadB dsaFo SzePsns Fu SzePopJg Pcue ustated Ut L ght Bass M n Bes nO %395*$3 95 M C 0 WaSheS ape Rubbe Wi 20 oZ * slos * L 135 * * STARSHIP $100 Williams Book $20 Order INDOOR MODEL AIRPLANES Ron Williams 264 Pgs Over 200 illustratIonS plus 2 FREE Full Size Plan Sheets tar lMS Easy B 95 INDOOR MODEL AIRPLANES Law Gitiow 46 Pas & Over 100 itustratIons reprint. 5 PEA N UT POWER Hannan 80 Pgs $895 INDOOR BALSA $695 P-NUT BALSA PACK $695 JAPANESE TISSUE 6 Cobra 12 Pack $350Roll 10 large $595 ROLL OF MICROLITE COVERING $325 CONDENSER PAPER $250WASHERS $150 RUBBER LUBE $150CEMENT $150 THRUST BEARING New Tiny 60 New Dual 100 NEW MARK 1 WINDERS161________$1195 NEW SMOOTHIE WiNDERS6l_______$395 81 Winder $195 $25 Order ALL ORDERS & KITS ADD 10% POSTAGE MInimum postage $150 16 PG CATALOG $100 DOX C OARDERVILLE CA 95440 -a-S 4 SAD 4 2 Earlham Ct Upper Marlboro Md 20772 J Sea Blue FS 35402 upper surfaces Navy planes including Corsairs Hellcats etc uses Hobbypoxy standard products mixed formula 3 parts H8 1 Black 2 parts H3 3 Stinson Green 1 part H24 Dark Blue Intermediate Blue FS 35164 used combination Sea Blue early WW II three-color camouflage schemes formula 4 parts H70 Gray 3 parts H66 Dark Red 1 part H24 Dark Blue proportions intended mixing Hobbypoxy epoxy standard enamel colors Mixing colors other products will guarantee same results proper degree non-gloss finish above mixtures should have equal quantity Part B Flat Hardener added Stand-OtTvs Precision number entrants recent Reno World Championships International Competition held important signif icance us first world meet Stand-Off entries outnumbered Precision F4C may very well have spelled demise latter strong movement afoot combine two classes under FAI As quality Precision-class models im proved past number Scale modelers willing expend tremendous effort pro duction has decreased top models F4C builders have come regarded rare holdovers past era Lincoln Nats quantity Precision Scale entries diminished two Stand-Off Scale has taken over almost entirely contest scene parallel movement model quality also seen class winning models already approach ing F4C detail craftsmanship Does wide disparity quality breed discontent retards competitive urge could see general reduction contest attendance world-class competition maximum pos sible static score 3250 both Stand-Off F4C Reno Terry Melleneys Moth Minor F4C higher static score best Stand-Off model Mick Reeves ill-fated Spitfire Average score top six places 150 points higher Stand-Off F4C Stand-Off class first six static scores bunched within 128 points F4C first six separated 497 points tells us something about quality judging two classes degree difficulty judging Precision models too great over burdened judges smothered task closely grouped Stand-Off scores real istic would appear five Stand-Off judges easier find betteriob 1/5th time Examples ofthe inequalities occur static judging seen scores well-known air planes appear unchanged World Cham pionships repeatedly Melleneys Moth Minor 1980 received static score 2352its lowest four meets Reno its score jumped 2836 George Rose Hawk P-6E score 2415 1980 slumped slow 1845 Reno Jean Rousseaus CAP-20 dropped 2659 2249 dramatic drop 2482 1910 Jack Swifts RV-3 pilot abilities being nearly equal static scores determine winners Anyone enters competition judged event must know risks involved dictate final placement Chance plays important part willing have efforts judged persons doubtful qualifications can elude risk flying masterpieces Scale Rallies increasing popularity Bob Dolly Wischer S-221 Lapham Peak Rd Delafield WI 53018 RC Soaring/Pruss Continued page 47 tasks Ten top 15 averaged under 30 seconds seven Speed flights best average seven Speed tasks Dick Odles 27 seconds Alex Bowers 199 good average would have around 245 seconds six-flight average 253 Consistency Mark Smith averaged 549 seven Duration flights landings averaged 971 points Jolly Watson Bower consistent Distance seven-flight averages 1128 110 1086 laps respec tively Steve Work highest-score throwaway round 24572 points Highest single-round score Bowers 29243 fourth Smith five 1000-point tasks Bower seven Edberg four Jolly six Too fliers lost precious working-time retriving models relaunch contrast to appreciate superb teamwork Jolly Mark Smith Skip Miller would catch models fly reposition hand relaunch back up toweach accomplished feat four seconds As mentioned beginning column Competition Newsletter presents details contest along some interesting side lights Whether youre international compe tition F3B can proud new USA team Theyre three different types individuals three different types Sailplanesbut have common goal Lets support can reach Dan Pruss 131 E Pennington Lane Plainfield IL 60544 SAFE FLYING IS NO ACCIDENT 126 Model Aviation FLYIN6 IS RUSOES BE FLYING K jolt f IN U A