CONTROL LINE SPEED THE DEADLINE FOR THIS COLUMN arrived too soon Instead working Speed engines like should Im building couple model engines No model airplane engines just models four-stroke twin-cylinder antique engines awful lot parts involved Ive always fascinated horizontal opposed twinsalways wanted OK never chance get Ive promised past columns write about newer engines obtained useful information several relatively new engines available Im sure some interested Some older ones still competitive K&B still has 65s sale remember Bill Nusz used win 93 Nats latest ones have some minor internal modifications larger-diameter minipipe Bill also used Nelson 40 win Formula 40 both engines still though have around several years Dub Jett past champion Speed flier World Champion Pylon Racing making variety 40s versions have front rear intakes side rear exhausts strongrunning engines can still use some tuning all-out Speed flying have massive well-braced solid crankcases have performing well Pylon FAL Pylon Quickie 500 Dub sent rear-intake rear-exhaust version trial Formula 40 built new airplane last summer just before Nats rear intake huge opening same size cutout rotor dont know such opening really necessary does run remote needle valve supplied fuel nipple injects fuel side big intake needle valve assembly designed pressure tank wont work pen bladder because doesnt shut fuel off too coarse set test-ran engine completed airplane just before Nats didnt have time check performance piston fit really tight second flight airplane torqued bounced off pavement splitting wing ripping out leadouts F40 engine running properly airplane usually takes off fast doesnt have time roll repaired airplane Dayton contest September disassembled engine see what wrong An examination piston revealed little no taper top sides gave indication tight top stroke production Dub machines taper about 00 15 top piston turned diamond tool piston lapped assure roundness size sometimes taper can reduced eliminated during lapping old days would have run engine high rpm obtain good fit taper takes too long ABC AAC sleeve pistonthat silicon alloy just doesnt wear against chromed surface So took chunk cast iron bored out taper 003 75 per inch per side Dayton Ohio Buzzin Buzzards host Cold Cash Speed Jerry Wiles pulse-jet-powered insecticide fogger Bash September 1994 turnout exceptional sold military smoke generators too 122 Model Aviation Shannon dad showed up Dayton eyes lit up saw heard big 65 engines again Bill Wisniewskis Pink Lady Tuned pipe Class B version won last years Nats powered K&B 29 engine course inch length bore decreased total 0065 diameter Like other Speed innovations dimension came Bill Wisniewski measured good-running well-broken-in engine cast iron about inch long bored out until piston would go about halfway can keep concentric lapping want tapered area about /to-/u inch long takes very little lapping achieve thatbe careful used some 900-grit aluminum oxide powder light oil lapping try dont use emery compound diamond compound sure get aluminum oxide some Foxs Lustrox powder size grit should around 1000 dont use coarse stuff like 500 lower powders can listed micron sizes too 1000-grit equivalent 3 microns Lapping compounds available lapidary shops astronomical supply shops metallurgical labs some industrial supply houses laps can made brass copper steel arent good cast iron tapering piston really woke Jett engine up needed hotter glow plug Nelson insert-type came allow richer setting takeoff have get some little GloBee inserts right up near winners Dayton contest Im also going open up exhaust opening crankcase sleeve use larger-diameter minipipe try rpm want exhaust gases expand get out way soon possible minipipe tuned pipe need compression exhaust port minipipe might try trumpet-shaped head too low-nitro fuel doesnt need high turbulence like get squish-band head Ill have try some other props maybe less pitch less diameter maybe different types Things Jett engine AAC type utilizing chrome-plated high-silicon alloy aluminum sleeve similar alloy pistona combination can give good better performance ABC brass sleeve lighter learned years ago fit ABC engines go fast never worked enough AACs know much about brass sleeves expand heat little bit aluminum alloy pistons have very tight room temperature Dub told properly test AAC engine fit Ill try explain Run engine test stand slightly smaller prop allow engine rev up flying rpm other words run hardusing flying fuel course Let run long enough get up maximum temperature pinch off fuel line stop engine Immediatelybefore gets chance cool downturn engine over feel bump top stroke What want perfect seal engine operating temperature prop turns over little no compressionif squishes rather pops overthe piston sleeve fit too loose binds turned over fit too tight Simple huh never would have thought l/r6rXkOOi Learn fly planes private field Five 6 day course $350 Open year round Send SASE complete info Southwest RC Flying 2818 Carolina NE Albuquerque NM 87110__5058326394 FIX IT YOURSELF Easy use oSave Money eSave Time As low $1095 FREE Catalog Call hy 1-800-4SMITHY srnllr~A 1 800 476 4849 E 2nd Street Ask operator MA les OR 97055 ULTIMATESPORT RC 255 EoO ARIiond/PO Boo 727/Sodo Spriogs Idoho 83276 ULIiWIE IO-30011P11208-5473742F*F0h,*f*S*dS0SE May1995 123 Ceeen 150 8Pfr5AU ICE k nVll astom fatters GBT 4302ff 750W UuoaIen IN 46767 219 894-3370 Obechi Large Sheets Please call 509-548-5201 send SASE 12306 Bergstrasse Leavenworth WA 98826 ERHAWK IICOUPE WON 94 NATS UPDATED PIG VERSION FORMED BODY TUBE MONTREAL lYPE HUB REDI-CUT RIBS TOP GRADE BALSA ,TR0nJemR0 FIeE ALL HARDWARE INCL$4995 NCH WINGSPAN SPARROWHAWK P30 WON 8T AND 93 HATS FORMED BODY TUBE REDI-CIJT RIBS YELLOW CZECH PROP ALL HARDWARE INCL DESIGNS BY JOHN ODWYER ORDER lOTS PROM MODEL AIRcRAFr LABS DEPt 108 S LEE STREEt 214438-9233 WIRVING TEXAS 75060 S41I59Smodels Aerographies 1913 Eastbonrne Monoplane 1994 AMA Indoor Scale Nats WINNER First quality materials include wheels pilot rigging real tloater 3000 item catalog $5 FREE kits Send today SAMS Models Chapel Sandon Buntingtord Hurts SG9 OOJ ENGLAND US Checks Stamps NOT valid UK Send $ bills registered Sterling traveller Checks use AMEX Tel t763 288384 VISA Mastercard F*oo FIyi*g SodocR Al*,LodngGeo CIeo CoopyA*oiIoble B*ldes Ki 8255SS.d Ki $365DI**o Sheeed K, 8095
Edition: Model Aviation - 1995/05
Page Numbers: 122, 123
CONTROL LINE SPEED THE DEADLINE FOR THIS COLUMN arrived too soon Instead working Speed engines like should Im building couple model engines No model airplane engines just models four-stroke twin-cylinder antique engines awful lot parts involved Ive always fascinated horizontal opposed twinsalways wanted OK never chance get Ive promised past columns write about newer engines obtained useful information several relatively new engines available Im sure some interested Some older ones still competitive K&B still has 65s sale remember Bill Nusz used win 93 Nats latest ones have some minor internal modifications larger-diameter minipipe Bill also used Nelson 40 win Formula 40 both engines still though have around several years Dub Jett past champion Speed flier World Champion Pylon Racing making variety 40s versions have front rear intakes side rear exhausts strongrunning engines can still use some tuning all-out Speed flying have massive well-braced solid crankcases have performing well Pylon FAL Pylon Quickie 500 Dub sent rear-intake rear-exhaust version trial Formula 40 built new airplane last summer just before Nats rear intake huge opening same size cutout rotor dont know such opening really necessary does run remote needle valve supplied fuel nipple injects fuel side big intake needle valve assembly designed pressure tank wont work pen bladder because doesnt shut fuel off too coarse set test-ran engine completed airplane just before Nats didnt have time check performance piston fit really tight second flight airplane torqued bounced off pavement splitting wing ripping out leadouts F40 engine running properly airplane usually takes off fast doesnt have time roll repaired airplane Dayton contest September disassembled engine see what wrong An examination piston revealed little no taper top sides gave indication tight top stroke production Dub machines taper about 00 15 top piston turned diamond tool piston lapped assure roundness size sometimes taper can reduced eliminated during lapping old days would have run engine high rpm obtain good fit taper takes too long ABC AAC sleeve pistonthat silicon alloy just doesnt wear against chromed surface So took chunk cast iron bored out taper 003 75 per inch per side Dayton Ohio Buzzin Buzzards host Cold Cash Speed Jerry Wiles pulse-jet-powered insecticide fogger Bash September 1994 turnout exceptional sold military smoke generators too 122 Model Aviation Shannon dad showed up Dayton eyes lit up saw heard big 65 engines again Bill Wisniewskis Pink Lady Tuned pipe Class B version won last years Nats powered K&B 29 engine course inch length bore decreased total 0065 diameter Like other Speed innovations dimension came Bill Wisniewski measured good-running well-broken-in engine cast iron about inch long bored out until piston would go about halfway can keep concentric lapping want tapered area about /to-/u inch long takes very little lapping achieve thatbe careful used some 900-grit aluminum oxide powder light oil lapping try dont use emery compound diamond compound sure get aluminum oxide some Foxs Lustrox powder size grit should around 1000 dont use coarse stuff like 500 lower powders can listed micron sizes too 1000-grit equivalent 3 microns Lapping compounds available lapidary shops astronomical supply shops metallurgical labs some industrial supply houses laps can made brass copper steel arent good cast iron tapering piston really woke Jett engine up needed hotter glow plug Nelson insert-type came allow richer setting takeoff have get some little GloBee inserts right up near winners Dayton contest Im also going open up exhaust opening crankcase sleeve use larger-diameter minipipe try rpm want exhaust gases expand get out way soon possible minipipe tuned pipe need compression exhaust port minipipe might try trumpet-shaped head too low-nitro fuel doesnt need high turbulence like get squish-band head Ill have try some other props maybe less pitch less diameter maybe different types Things Jett engine AAC type utilizing chrome-plated high-silicon alloy aluminum sleeve similar alloy pistona combination can give good better performance ABC brass sleeve lighter learned years ago fit ABC engines go fast never worked enough AACs know much about brass sleeves expand heat little bit aluminum alloy pistons have very tight room temperature Dub told properly test AAC engine fit Ill try explain Run engine test stand slightly smaller prop allow engine rev up flying rpm other words run hardusing flying fuel course Let run long enough get up maximum temperature pinch off fuel line stop engine Immediatelybefore gets chance cool downturn engine over feel bump top stroke What want perfect seal engine operating temperature prop turns over little no compressionif squishes rather pops overthe piston sleeve fit too loose binds turned over fit too tight Simple huh never would have thought l/r6rXkOOi Learn fly planes private field Five 6 day course $350 Open year round Send SASE complete info Southwest RC Flying 2818 Carolina NE Albuquerque NM 87110__5058326394 FIX IT YOURSELF Easy use oSave Money eSave Time As low $1095 FREE Catalog Call hy 1-800-4SMITHY srnllr~A 1 800 476 4849 E 2nd Street Ask operator MA les OR 97055 ULTIMATESPORT RC 255 EoO ARIiond/PO Boo 727/Sodo Spriogs Idoho 83276 ULIiWIE IO-30011P11208-5473742F*F0h,*f*S*dS0SE May1995 123 Ceeen 150 8Pfr5AU ICE k nVll astom fatters GBT 4302ff 750W UuoaIen IN 46767 219 894-3370 Obechi Large Sheets Please call 509-548-5201 send SASE 12306 Bergstrasse Leavenworth WA 98826 ERHAWK IICOUPE WON 94 NATS UPDATED PIG VERSION FORMED BODY TUBE MONTREAL lYPE HUB REDI-CUT RIBS TOP GRADE BALSA ,TR0nJemR0 FIeE ALL HARDWARE INCL$4995 NCH WINGSPAN SPARROWHAWK P30 WON 8T AND 93 HATS FORMED BODY TUBE REDI-CIJT RIBS YELLOW CZECH PROP ALL HARDWARE INCL DESIGNS BY JOHN ODWYER ORDER lOTS PROM MODEL AIRcRAFr LABS DEPt 108 S LEE STREEt 214438-9233 WIRVING TEXAS 75060 S41I59Smodels Aerographies 1913 Eastbonrne Monoplane 1994 AMA Indoor Scale Nats WINNER First quality materials include wheels pilot rigging real tloater 3000 item catalog $5 FREE kits Send today SAMS Models Chapel Sandon Buntingtord Hurts SG9 OOJ ENGLAND US Checks Stamps NOT valid UK Send $ bills registered Sterling traveller Checks use AMEX Tel t763 288384 VISA Mastercard F*oo FIyi*g SodocR Al*,LodngGeo CIeo CoopyA*oiIoble B*ldes Ki 8255SS.d Ki $365DI**o Sheeed K, 8095