Control Inc Racing Bill Lee AS MOST follow column regular basis must realize am personally Racing may change future right now know enough about As say anything intelligent about Recently received very-well done letter Gene Daniels Norfolk Aeromodelers Norfolk VA boys group have become very successful Racing Nats trophy credit well victories local level am going let Genes letter carry Dear Bill past few years several members club Norfolk Aeromodelers have very active AMA CL racing events both local national levels have competed Scale Racing Slow Rat Rat Racing couple us have worked pretty hard FAI Team Racing rising costs fuel props glow plugs scarcity Rossi motor parts decided way could continue race have fun VzA Racing comes Three years ago two us decided build Scale Racer could enter additional Racing event US Control Line Cham pionships held June Winston Salem NC Before event started shared practice circle 10-year-old boy Pennsylvania boys airplane least 10 miles per hour faster getting 50 laps compared 18 laps getting per tank fuel rolled up lines put plane back car went watch Combat spring decided take another look Racing Remembering first attempt started period research development order become competitive have consistently turned 50-lap heat race times low 220s date best 100-lap feature has run tune 436 have enjoyed very successful summer YzA Racing motors set up described letter dont already have motor reed valve racing recommend buy Cox QRC 049 motor has Baby Bee crankcase large tank dual-intake-ported piston cylinder motor has usable parts Golden Bee Black Widow have too successful using either Golden Bee Black Widow crankcases gold black anodizing outside case also covers entire inside case motor turns high rpms racing anodizing tends break loose form grit grit causes galling locking up crankshaft case Baby Bee crankcase also coated have experienced same problems case use mixture toothpaste 3-in-i Oil lapping compound remove bumping dragging crankshaft case turning crankshaft electric drill about 30 seconds case should loosened up enough allow crankshaft turn freely Most crankcases have raised metal around tank screw holes condition prevents good seal paper case/tank gasket remove metal lap crankcase back remove substantial amount metal case remove raised metal obtain gasket seal lapping plate consists piece 600-grit wet-or-dry sandpaper taped piece plate glass couple drops 3-in-i Oil put sandpaper lubrication After completing crankcase work clean parts hot soapy water rinse well alcohol reassemble case using little 3-in-i Oil prevent rusting corrosion Any large Golden Bee-type fuel tanks will work except Black Widow Taxk have found B-W fuel tanks have drip run anodizing area reed seats can blow backward through reed sealing adequately bad reed seal causes large reduction rpms have no trouble gold red silver tanks ensure good reed seal tanks polish reed seat little jewelers rouge Dremel tool buffing wheel have best luck stock tank vents have found earlier Golden Bee tanks worth 500 rpm over newertanks due shape trumpet throat Presently fourtypes reeds avallable Continued page 119 50 Model Aviation ome OT inc 12A Mouse Racers usca oy tne NOrtOIK Aeromodelers flying wing inspired Gator Perkins FAI team racerits fast too Most feature titanium landing gear Norfolk Aeromodelers-developed hot thumb pit glove fOr1/2A Mouse Racing Two-volt gelcell battery needs dropping resistor shown keep burning Out 1 volt glow plugs Tuning Cox reed-valve engine Mouse rinGing ILl iris simultaneous drilling 3/32-in tank backplate C modified tank backplate showing brasstubing fuel pickupand surgical tubing installedon needlevalveto improve sealing Rthesetup usedto lapthecrankcase backandthe glow head good sealingalso shown 20X pocket microscrope used inspect engine parts Photos tips NorfolkAeromodelers racing group tips appear months column CL Racing/Lee Continued page 50 two have successful Cox mylar reeds four-petal reed looks like old brass reed other reed sort oval shaped comes new RC Bee motors us have worked equally well have tried Davis Diesel teflon reed brass reeds would work us motor tended outrun reed causing motor miss also tried double brass reedswithout success large increase rpm drill venturi 3/32-in After removing reed reed retainer wire screen backplate has hold backplate tank together drill through both pieces same time using older backplate recommend replace wire screen keep rocks trash out motor biggest problems reed valve motors fuel pickup tube tends get knocked out position prevent happening bend replacement pickup out 3/3 2-in brass tubing tube attached backplate nipple using / piece ofmall Perfect brand fuel tubing coupler An alternative metal pickup tube would use plastic already1 fuelhardened internal spring removed gasket seal between backplate tank important Compression tends flatten black rubber gasket gasket should re placed frequently dual-intake-ported piston cylinder must Racing have used No 1 Black Widow No 4 Tee Dee cylinders motors No 4 seems slightly faster No 1 have much better luck motors piston cylin der run-in rather lapped run about 10 tanks fuel motor prior flying after 10 15 flights motor usually broken well enough race Some motors have needed less break numbers quoted average us have also tried porting timing changes motors have yet able improve stock setup run three five plug gaskets motors run no fewer three gaskets order obtain decent needle valve setting ease starting add gasket two required prevent blowing glow plugs have used Cox Tee Dee Gb Bee Racing plugs Gb Bee plug worth 1000 rpm over Tee Dee plug needle valve settings reliable want go broke use Gb Bee Otherwise use Tee Dee plug consistency Regardless glow plug brand use lap seating surface plugs obtain good head seal have tried running motors cylinder turned sideways reduce wind resist ance improve looks airplane motors tend run much better cylinders turned upright Another advantage upright cylinder saves needle valves during bad landings best propeller have found motor runs Top Flite 5 4 nylon Weve tried aimost propeller market some have little faster required much work nearly consistent needle valve settings mix own fuel following ingre dients 50% nitromethane 10% castor oil 10% Klotz synthetic oil 30% alcohol have used 40% 65% nitro THE DU-BRO UNIVERSAL MUFF-L-AIRE LI IT LOOKS LIKE EXHAUST STACK iT ITS REALLY MUFFLER Includes pressure fitting install desired BACKPRESSURE AND NOISE LEVEL CAN BE VARIED BY ADJUSTING THE MUFFLING SPRING IN OR OUT MUFFLER IS 3 LONG BUT CAN BE SHORTENED IF DESIRED TO FIT FLUSH WITH YOUR COWL SUPER CLEAN SUPER SIMPLE FITS ANY ENGINE FROM 09 TO 80 $895 MINI- MUFF-L-AIRE 11 FOR ENGINES 09 25 Lightweight aluminum body tapered end- exits exhaust straight away plane PERFECT FOR COWLED-IN ENGINES NO 236 ONLY $695 K&B 40 MUFFLER PRESSURE FITTING IS SIMPLE TO INSTALL DRILL ONE HOLE TOP OR BOTTOM AND LOCK ON WITH NUT DD SHAPES OR BULK CANS TO CONTEND WITH EASY INSTALLATION PERFECT FOR COWLEDIN ENGINES INCLUDES TWO SPECIAL EXHAUST PORT PLUGS NOISE LEVEL AND BACK PRESSURE ARE FACTORY SET FOR BEST OVERALL j PERFORMANCE BUT CAN BE____CAT NO 240 ALTERED AT YOUR OPTION Q fl v K ANODIZED BODY P07 DU-BRO PRODUCTS 11111111111Bonner Road Wauconda Illinois 60084 U BA OU#INCORPORATED May1981 119 MIKE MAS kJ MAS ENTERPRISES now offering totally new service helicopter enthusiast One-stop shopping R/C Helicopter needs regardless what Youre flying discount prices also offering free set-up flying instruction yours asking hare built flown analyzed osalor brand Helicopter avail able 5 staff qualified answer j questions ranging installing train 5 ing gear flying ship inserted Cssntoenbsailt Helicopters include choice Helicopter flog Radio Test Flown Limited Basisi AMA NATIONAL CHAMPION 1979 1980 Proudly Heads NEW FROM WORLD ENGINES ZENITH 40 POWERED HELICOPTER 5 HOUR CONSTRUCTION List $23995 SPECIAL Only $16998 Price Includes Extra Sat Main Rotos Tail Rotor BladaL M J MAS ENTERPRISES P0 Box 727 Miami FL 33197 Phone 305 256-0658 MJ MAS ENTERPRiSES SPECIALISTS IN RC HELICOPTERS 4O~HEDGuARTERs, SCHLUTER HE LI- BOY 60 Size CALL FOR OUR LOW PRICES Scldunar Helicopter Parts Stock Including Pipes Funalaga Etc LOWEST PRICES 4 0System 80 OVERSEAS DISTRIBUTORS PR~Ul INSTRUCTIONAL TAPES NOW AVAILABLE * Building Trimming Flying * Contest Flying Novice Expert Autorotations setup/Practice Aerobatics/Inverted Plight AMERICAN R/C MANTIS NOWONLY $11998 have found 50% best compromise Speed laps Dale Kim flys Speed works Cox says motors need least 10% castor oil fuel mixture prevent breaking rods galling cases Since getting advice last years Nats have used castor oil have broken far fewer parts Vibration killer model airplane motors probably true reed valves motor mount must very solid Racers maximum performance try keep nose planes short possible use plenty filserglass reinforcement Scale Racers weigh 3 4 oz minus motor have found weight approximately 4 oz just about right lighter planes hard get pit heavier planes load motor propeller keys winning Racing event consistency practice fastest airplane wont win races pit stops poor motor wont run entire race Work practice circle will pay off well race day During practice problems could cause trouble can often eliminated before contest Also pilot can become familiar airplane can fly good race pitman can perfect pitting efforts learn best operate motor things have talked about letter have worked well us should work least maybe have stirred some interest some ideas own Just dont afraid try something new doesnt work can go back does work much ahead Also share knowledge ideas Close competition fun runaway races Some sources parts racing goodies Kustom Kraftsmanship Joe Klsuse PO Box 2699 Laguna Hills CA 92653 Chops Products Inc Box 316 Yardley PA 19067 Hubschmidts Hobby Center RD 1 Box 318 Ewan Aura Rd Glassboro NJ 08028 group can contacted writing Gene Daniels Secretary Norfolk Aeromodelers 5761 Townley Ave Norfolk VA 23518 Please send SASE quick replies havent tried Racing give try bet youll like Good Luck Gene DanielsMark Barrows Jim WelchJoey Matheson John TateBob Ward Robert SwindellDoug Lee Scott Jenkins thanks fine group modelers Id hate guess dollar value free advice theyve just handed us Its letters like opportunity print AMAs magazine make truly Academy WR Lee 3522 Tamarisk Lane Missouri City TX 77549 CL Combat/Johnson Continued page 51 Johns design cutting leading edge two pieces 20-in long other 16-in long LE goes inboard side 16-in piece goes outboard engine piece bass gives enough strength cutout area Genes plane called STP stands Square-Tipped-Plane thats exactly what hes got tip rib Ys-in suffices wingtip could have plans Genes plane subscribe Flying Lines newsletter $800 year gets lot information pictures plans Send money Flying Lines 1411 Bryant Ave Cottage Grove OR 97424 MACA newsletter seems coming out regularly again youre adventurous might try sending membership Frank McCune spends lot time money finding out latest manufacturers competitors does good job editing limited amount material sent membership Latest news John Gladfelter World Engines new Supertigre 5-36 will have lapped piston its setup gives 120 Model Aviation ERO ~UAU arn~ U I Fiberglass Fuselage Molded Interior Foam Cores & Metal Engine Mount 3-Formed Gears Hardware 65/s Span 40 fo 60 Englnea 4-6 R/C Charinola $15995THE V-TAILED NA Foam Cores & balsa skins Formed Gear & Canopy 40 fo 50 Englnsa 54 Wlngapan 590 Sq ORP, 167-B Maw HIghway North AmhyvlII NY 11701
Edition: Model Aviation - 1981/05
Page Numbers: 50, 119, 120
Control Inc Racing Bill Lee AS MOST follow column regular basis must realize am personally Racing may change future right now know enough about As say anything intelligent about Recently received very-well done letter Gene Daniels Norfolk Aeromodelers Norfolk VA boys group have become very successful Racing Nats trophy credit well victories local level am going let Genes letter carry Dear Bill past few years several members club Norfolk Aeromodelers have very active AMA CL racing events both local national levels have competed Scale Racing Slow Rat Rat Racing couple us have worked pretty hard FAI Team Racing rising costs fuel props glow plugs scarcity Rossi motor parts decided way could continue race have fun VzA Racing comes Three years ago two us decided build Scale Racer could enter additional Racing event US Control Line Cham pionships held June Winston Salem NC Before event started shared practice circle 10-year-old boy Pennsylvania boys airplane least 10 miles per hour faster getting 50 laps compared 18 laps getting per tank fuel rolled up lines put plane back car went watch Combat spring decided take another look Racing Remembering first attempt started period research development order become competitive have consistently turned 50-lap heat race times low 220s date best 100-lap feature has run tune 436 have enjoyed very successful summer YzA Racing motors set up described letter dont already have motor reed valve racing recommend buy Cox QRC 049 motor has Baby Bee crankcase large tank dual-intake-ported piston cylinder motor has usable parts Golden Bee Black Widow have too successful using either Golden Bee Black Widow crankcases gold black anodizing outside case also covers entire inside case motor turns high rpms racing anodizing tends break loose form grit grit causes galling locking up crankshaft case Baby Bee crankcase also coated have experienced same problems case use mixture toothpaste 3-in-i Oil lapping compound remove bumping dragging crankshaft case turning crankshaft electric drill about 30 seconds case should loosened up enough allow crankshaft turn freely Most crankcases have raised metal around tank screw holes condition prevents good seal paper case/tank gasket remove metal lap crankcase back remove substantial amount metal case remove raised metal obtain gasket seal lapping plate consists piece 600-grit wet-or-dry sandpaper taped piece plate glass couple drops 3-in-i Oil put sandpaper lubrication After completing crankcase work clean parts hot soapy water rinse well alcohol reassemble case using little 3-in-i Oil prevent rusting corrosion Any large Golden Bee-type fuel tanks will work except Black Widow Taxk have found B-W fuel tanks have drip run anodizing area reed seats can blow backward through reed sealing adequately bad reed seal causes large reduction rpms have no trouble gold red silver tanks ensure good reed seal tanks polish reed seat little jewelers rouge Dremel tool buffing wheel have best luck stock tank vents have found earlier Golden Bee tanks worth 500 rpm over newertanks due shape trumpet throat Presently fourtypes reeds avallable Continued page 119 50 Model Aviation ome OT inc 12A Mouse Racers usca oy tne NOrtOIK Aeromodelers flying wing inspired Gator Perkins FAI team racerits fast too Most feature titanium landing gear Norfolk Aeromodelers-developed hot thumb pit glove fOr1/2A Mouse Racing Two-volt gelcell battery needs dropping resistor shown keep burning Out 1 volt glow plugs Tuning Cox reed-valve engine Mouse rinGing ILl iris simultaneous drilling 3/32-in tank backplate C modified tank backplate showing brasstubing fuel pickupand surgical tubing installedon needlevalveto improve sealing Rthesetup usedto lapthecrankcase backandthe glow head good sealingalso shown 20X pocket microscrope used inspect engine parts Photos tips NorfolkAeromodelers racing group tips appear months column CL Racing/Lee Continued page 50 two have successful Cox mylar reeds four-petal reed looks like old brass reed other reed sort oval shaped comes new RC Bee motors us have worked equally well have tried Davis Diesel teflon reed brass reeds would work us motor tended outrun reed causing motor miss also tried double brass reedswithout success large increase rpm drill venturi 3/32-in After removing reed reed retainer wire screen backplate has hold backplate tank together drill through both pieces same time using older backplate recommend replace wire screen keep rocks trash out motor biggest problems reed valve motors fuel pickup tube tends get knocked out position prevent happening bend replacement pickup out 3/3 2-in brass tubing tube attached backplate nipple using / piece ofmall Perfect brand fuel tubing coupler An alternative metal pickup tube would use plastic already1 fuelhardened internal spring removed gasket seal between backplate tank important Compression tends flatten black rubber gasket gasket should re placed frequently dual-intake-ported piston cylinder must Racing have used No 1 Black Widow No 4 Tee Dee cylinders motors No 4 seems slightly faster No 1 have much better luck motors piston cylin der run-in rather lapped run about 10 tanks fuel motor prior flying after 10 15 flights motor usually broken well enough race Some motors have needed less break numbers quoted average us have also tried porting timing changes motors have yet able improve stock setup run three five plug gaskets motors run no fewer three gaskets order obtain decent needle valve setting ease starting add gasket two required prevent blowing glow plugs have used Cox Tee Dee Gb Bee Racing plugs Gb Bee plug worth 1000 rpm over Tee Dee plug needle valve settings reliable want go broke use Gb Bee Otherwise use Tee Dee plug consistency Regardless glow plug brand use lap seating surface plugs obtain good head seal have tried running motors cylinder turned sideways reduce wind resist ance improve looks airplane motors tend run much better cylinders turned upright Another advantage upright cylinder saves needle valves during bad landings best propeller have found motor runs Top Flite 5 4 nylon Weve tried aimost propeller market some have little faster required much work nearly consistent needle valve settings mix own fuel following ingre dients 50% nitromethane 10% castor oil 10% Klotz synthetic oil 30% alcohol have used 40% 65% nitro THE DU-BRO UNIVERSAL MUFF-L-AIRE LI IT LOOKS LIKE EXHAUST STACK iT ITS REALLY MUFFLER Includes pressure fitting install desired BACKPRESSURE AND NOISE LEVEL CAN BE VARIED BY ADJUSTING THE MUFFLING SPRING IN OR OUT MUFFLER IS 3 LONG BUT CAN BE SHORTENED IF DESIRED TO FIT FLUSH WITH YOUR COWL SUPER CLEAN SUPER SIMPLE FITS ANY ENGINE FROM 09 TO 80 $895 MINI- MUFF-L-AIRE 11 FOR ENGINES 09 25 Lightweight aluminum body tapered end- exits exhaust straight away plane PERFECT FOR COWLED-IN ENGINES NO 236 ONLY $695 K&B 40 MUFFLER PRESSURE FITTING IS SIMPLE TO INSTALL DRILL ONE HOLE TOP OR BOTTOM AND LOCK ON WITH NUT DD SHAPES OR BULK CANS TO CONTEND WITH EASY INSTALLATION PERFECT FOR COWLEDIN ENGINES INCLUDES TWO SPECIAL EXHAUST PORT PLUGS NOISE LEVEL AND BACK PRESSURE ARE FACTORY SET FOR BEST OVERALL j PERFORMANCE BUT CAN BE____CAT NO 240 ALTERED AT YOUR OPTION Q fl v K ANODIZED BODY P07 DU-BRO PRODUCTS 11111111111Bonner Road Wauconda Illinois 60084 U BA OU#INCORPORATED May1981 119 MIKE MAS kJ MAS ENTERPRISES now offering totally new service helicopter enthusiast One-stop shopping R/C Helicopter needs regardless what Youre flying discount prices also offering free set-up flying instruction yours asking hare built flown analyzed osalor brand Helicopter avail able 5 staff qualified answer j questions ranging installing train 5 ing gear flying ship inserted Cssntoenbsailt Helicopters include choice Helicopter flog Radio Test Flown Limited Basisi AMA NATIONAL CHAMPION 1979 1980 Proudly Heads NEW FROM WORLD ENGINES ZENITH 40 POWERED HELICOPTER 5 HOUR CONSTRUCTION List $23995 SPECIAL Only $16998 Price Includes Extra Sat Main Rotos Tail Rotor BladaL M J MAS ENTERPRISES P0 Box 727 Miami FL 33197 Phone 305 256-0658 MJ MAS ENTERPRiSES SPECIALISTS IN RC HELICOPTERS 4O~HEDGuARTERs, SCHLUTER HE LI- BOY 60 Size CALL FOR OUR LOW PRICES Scldunar Helicopter Parts Stock Including Pipes Funalaga Etc LOWEST PRICES 4 0System 80 OVERSEAS DISTRIBUTORS PR~Ul INSTRUCTIONAL TAPES NOW AVAILABLE * Building Trimming Flying * Contest Flying Novice Expert Autorotations setup/Practice Aerobatics/Inverted Plight AMERICAN R/C MANTIS NOWONLY $11998 have found 50% best compromise Speed laps Dale Kim flys Speed works Cox says motors need least 10% castor oil fuel mixture prevent breaking rods galling cases Since getting advice last years Nats have used castor oil have broken far fewer parts Vibration killer model airplane motors probably true reed valves motor mount must very solid Racers maximum performance try keep nose planes short possible use plenty filserglass reinforcement Scale Racers weigh 3 4 oz minus motor have found weight approximately 4 oz just about right lighter planes hard get pit heavier planes load motor propeller keys winning Racing event consistency practice fastest airplane wont win races pit stops poor motor wont run entire race Work practice circle will pay off well race day During practice problems could cause trouble can often eliminated before contest Also pilot can become familiar airplane can fly good race pitman can perfect pitting efforts learn best operate motor things have talked about letter have worked well us should work least maybe have stirred some interest some ideas own Just dont afraid try something new doesnt work can go back does work much ahead Also share knowledge ideas Close competition fun runaway races Some sources parts racing goodies Kustom Kraftsmanship Joe Klsuse PO Box 2699 Laguna Hills CA 92653 Chops Products Inc Box 316 Yardley PA 19067 Hubschmidts Hobby Center RD 1 Box 318 Ewan Aura Rd Glassboro NJ 08028 group can contacted writing Gene Daniels Secretary Norfolk Aeromodelers 5761 Townley Ave Norfolk VA 23518 Please send SASE quick replies havent tried Racing give try bet youll like Good Luck Gene DanielsMark Barrows Jim WelchJoey Matheson John TateBob Ward Robert SwindellDoug Lee Scott Jenkins thanks fine group modelers Id hate guess dollar value free advice theyve just handed us Its letters like opportunity print AMAs magazine make truly Academy WR Lee 3522 Tamarisk Lane Missouri City TX 77549 CL Combat/Johnson Continued page 51 Johns design cutting leading edge two pieces 20-in long other 16-in long LE goes inboard side 16-in piece goes outboard engine piece bass gives enough strength cutout area Genes plane called STP stands Square-Tipped-Plane thats exactly what hes got tip rib Ys-in suffices wingtip could have plans Genes plane subscribe Flying Lines newsletter $800 year gets lot information pictures plans Send money Flying Lines 1411 Bryant Ave Cottage Grove OR 97424 MACA newsletter seems coming out regularly again youre adventurous might try sending membership Frank McCune spends lot time money finding out latest manufacturers competitors does good job editing limited amount material sent membership Latest news John Gladfelter World Engines new Supertigre 5-36 will have lapped piston its setup gives 120 Model Aviation ERO ~UAU arn~ U I Fiberglass Fuselage Molded Interior Foam Cores & Metal Engine Mount 3-Formed Gears Hardware 65/s Span 40 fo 60 Englnea 4-6 R/C Charinola $15995THE V-TAILED NA Foam Cores & balsa skins Formed Gear & Canopy 40 fo 50 Englnsa 54 Wlngapan 590 Sq ORP, 167-B Maw HIghway North AmhyvlII NY 11701
Edition: Model Aviation - 1981/05
Page Numbers: 50, 119, 120
Control Inc Racing Bill Lee AS MOST follow column regular basis must realize am personally Racing may change future right now know enough about As say anything intelligent about Recently received very-well done letter Gene Daniels Norfolk Aeromodelers Norfolk VA boys group have become very successful Racing Nats trophy credit well victories local level am going let Genes letter carry Dear Bill past few years several members club Norfolk Aeromodelers have very active AMA CL racing events both local national levels have competed Scale Racing Slow Rat Rat Racing couple us have worked pretty hard FAI Team Racing rising costs fuel props glow plugs scarcity Rossi motor parts decided way could continue race have fun VzA Racing comes Three years ago two us decided build Scale Racer could enter additional Racing event US Control Line Cham pionships held June Winston Salem NC Before event started shared practice circle 10-year-old boy Pennsylvania boys airplane least 10 miles per hour faster getting 50 laps compared 18 laps getting per tank fuel rolled up lines put plane back car went watch Combat spring decided take another look Racing Remembering first attempt started period research development order become competitive have consistently turned 50-lap heat race times low 220s date best 100-lap feature has run tune 436 have enjoyed very successful summer YzA Racing motors set up described letter dont already have motor reed valve racing recommend buy Cox QRC 049 motor has Baby Bee crankcase large tank dual-intake-ported piston cylinder motor has usable parts Golden Bee Black Widow have too successful using either Golden Bee Black Widow crankcases gold black anodizing outside case also covers entire inside case motor turns high rpms racing anodizing tends break loose form grit grit causes galling locking up crankshaft case Baby Bee crankcase also coated have experienced same problems case use mixture toothpaste 3-in-i Oil lapping compound remove bumping dragging crankshaft case turning crankshaft electric drill about 30 seconds case should loosened up enough allow crankshaft turn freely Most crankcases have raised metal around tank screw holes condition prevents good seal paper case/tank gasket remove metal lap crankcase back remove substantial amount metal case remove raised metal obtain gasket seal lapping plate consists piece 600-grit wet-or-dry sandpaper taped piece plate glass couple drops 3-in-i Oil put sandpaper lubrication After completing crankcase work clean parts hot soapy water rinse well alcohol reassemble case using little 3-in-i Oil prevent rusting corrosion Any large Golden Bee-type fuel tanks will work except Black Widow Taxk have found B-W fuel tanks have drip run anodizing area reed seats can blow backward through reed sealing adequately bad reed seal causes large reduction rpms have no trouble gold red silver tanks ensure good reed seal tanks polish reed seat little jewelers rouge Dremel tool buffing wheel have best luck stock tank vents have found earlier Golden Bee tanks worth 500 rpm over newertanks due shape trumpet throat Presently fourtypes reeds avallable Continued page 119 50 Model Aviation ome OT inc 12A Mouse Racers usca oy tne NOrtOIK Aeromodelers flying wing inspired Gator Perkins FAI team racerits fast too Most feature titanium landing gear Norfolk Aeromodelers-developed hot thumb pit glove fOr1/2A Mouse Racing Two-volt gelcell battery needs dropping resistor shown keep burning Out 1 volt glow plugs Tuning Cox reed-valve engine Mouse rinGing ILl iris simultaneous drilling 3/32-in tank backplate C modified tank backplate showing brasstubing fuel pickupand surgical tubing installedon needlevalveto improve sealing Rthesetup usedto lapthecrankcase backandthe glow head good sealingalso shown 20X pocket microscrope used inspect engine parts Photos tips NorfolkAeromodelers racing group tips appear months column CL Racing/Lee Continued page 50 two have successful Cox mylar reeds four-petal reed looks like old brass reed other reed sort oval shaped comes new RC Bee motors us have worked equally well have tried Davis Diesel teflon reed brass reeds would work us motor tended outrun reed causing motor miss also tried double brass reedswithout success large increase rpm drill venturi 3/32-in After removing reed reed retainer wire screen backplate has hold backplate tank together drill through both pieces same time using older backplate recommend replace wire screen keep rocks trash out motor biggest problems reed valve motors fuel pickup tube tends get knocked out position prevent happening bend replacement pickup out 3/3 2-in brass tubing tube attached backplate nipple using / piece ofmall Perfect brand fuel tubing coupler An alternative metal pickup tube would use plastic already1 fuelhardened internal spring removed gasket seal between backplate tank important Compression tends flatten black rubber gasket gasket should re placed frequently dual-intake-ported piston cylinder must Racing have used No 1 Black Widow No 4 Tee Dee cylinders motors No 4 seems slightly faster No 1 have much better luck motors piston cylin der run-in rather lapped run about 10 tanks fuel motor prior flying after 10 15 flights motor usually broken well enough race Some motors have needed less break numbers quoted average us have also tried porting timing changes motors have yet able improve stock setup run three five plug gaskets motors run no fewer three gaskets order obtain decent needle valve setting ease starting add gasket two required prevent blowing glow plugs have used Cox Tee Dee Gb Bee Racing plugs Gb Bee plug worth 1000 rpm over Tee Dee plug needle valve settings reliable want go broke use Gb Bee Otherwise use Tee Dee plug consistency Regardless glow plug brand use lap seating surface plugs obtain good head seal have tried running motors cylinder turned sideways reduce wind resist ance improve looks airplane motors tend run much better cylinders turned upright Another advantage upright cylinder saves needle valves during bad landings best propeller have found motor runs Top Flite 5 4 nylon Weve tried aimost propeller market some have little faster required much work nearly consistent needle valve settings mix own fuel following ingre dients 50% nitromethane 10% castor oil 10% Klotz synthetic oil 30% alcohol have used 40% 65% nitro THE DU-BRO UNIVERSAL MUFF-L-AIRE LI IT LOOKS LIKE EXHAUST STACK iT ITS REALLY MUFFLER Includes pressure fitting install desired BACKPRESSURE AND NOISE LEVEL CAN BE VARIED BY ADJUSTING THE MUFFLING SPRING IN OR OUT MUFFLER IS 3 LONG BUT CAN BE SHORTENED IF DESIRED TO FIT FLUSH WITH YOUR COWL SUPER CLEAN SUPER SIMPLE FITS ANY ENGINE FROM 09 TO 80 $895 MINI- MUFF-L-AIRE 11 FOR ENGINES 09 25 Lightweight aluminum body tapered end- exits exhaust straight away plane PERFECT FOR COWLED-IN ENGINES NO 236 ONLY $695 K&B 40 MUFFLER PRESSURE FITTING IS SIMPLE TO INSTALL DRILL ONE HOLE TOP OR BOTTOM AND LOCK ON WITH NUT DD SHAPES OR BULK CANS TO CONTEND WITH EASY INSTALLATION PERFECT FOR COWLEDIN ENGINES INCLUDES TWO SPECIAL EXHAUST PORT PLUGS NOISE LEVEL AND BACK PRESSURE ARE FACTORY SET FOR BEST OVERALL j PERFORMANCE BUT CAN BE____CAT NO 240 ALTERED AT YOUR OPTION Q fl v K ANODIZED BODY P07 DU-BRO PRODUCTS 11111111111Bonner Road Wauconda Illinois 60084 U BA OU#INCORPORATED May1981 119 MIKE MAS kJ MAS ENTERPRISES now offering totally new service helicopter enthusiast One-stop shopping R/C Helicopter needs regardless what Youre flying discount prices also offering free set-up flying instruction yours asking hare built flown analyzed osalor brand Helicopter avail able 5 staff qualified answer j questions ranging installing train 5 ing gear flying ship inserted Cssntoenbsailt Helicopters include choice Helicopter flog Radio Test Flown Limited Basisi AMA NATIONAL CHAMPION 1979 1980 Proudly Heads NEW FROM WORLD ENGINES ZENITH 40 POWERED HELICOPTER 5 HOUR CONSTRUCTION List $23995 SPECIAL Only $16998 Price Includes Extra Sat Main Rotos Tail Rotor BladaL M J MAS ENTERPRISES P0 Box 727 Miami FL 33197 Phone 305 256-0658 MJ MAS ENTERPRiSES SPECIALISTS IN RC HELICOPTERS 4O~HEDGuARTERs, SCHLUTER HE LI- BOY 60 Size CALL FOR OUR LOW PRICES Scldunar Helicopter Parts Stock Including Pipes Funalaga Etc LOWEST PRICES 4 0System 80 OVERSEAS DISTRIBUTORS PR~Ul INSTRUCTIONAL TAPES NOW AVAILABLE * Building Trimming Flying * Contest Flying Novice Expert Autorotations setup/Practice Aerobatics/Inverted Plight AMERICAN R/C MANTIS NOWONLY $11998 have found 50% best compromise Speed laps Dale Kim flys Speed works Cox says motors need least 10% castor oil fuel mixture prevent breaking rods galling cases Since getting advice last years Nats have used castor oil have broken far fewer parts Vibration killer model airplane motors probably true reed valves motor mount must very solid Racers maximum performance try keep nose planes short possible use plenty filserglass reinforcement Scale Racers weigh 3 4 oz minus motor have found weight approximately 4 oz just about right lighter planes hard get pit heavier planes load motor propeller keys winning Racing event consistency practice fastest airplane wont win races pit stops poor motor wont run entire race Work practice circle will pay off well race day During practice problems could cause trouble can often eliminated before contest Also pilot can become familiar airplane can fly good race pitman can perfect pitting efforts learn best operate motor things have talked about letter have worked well us should work least maybe have stirred some interest some ideas own Just dont afraid try something new doesnt work can go back does work much ahead Also share knowledge ideas Close competition fun runaway races Some sources parts racing goodies Kustom Kraftsmanship Joe Klsuse PO Box 2699 Laguna Hills CA 92653 Chops Products Inc Box 316 Yardley PA 19067 Hubschmidts Hobby Center RD 1 Box 318 Ewan Aura Rd Glassboro NJ 08028 group can contacted writing Gene Daniels Secretary Norfolk Aeromodelers 5761 Townley Ave Norfolk VA 23518 Please send SASE quick replies havent tried Racing give try bet youll like Good Luck Gene DanielsMark Barrows Jim WelchJoey Matheson John TateBob Ward Robert SwindellDoug Lee Scott Jenkins thanks fine group modelers Id hate guess dollar value free advice theyve just handed us Its letters like opportunity print AMAs magazine make truly Academy WR Lee 3522 Tamarisk Lane Missouri City TX 77549 CL Combat/Johnson Continued page 51 Johns design cutting leading edge two pieces 20-in long other 16-in long LE goes inboard side 16-in piece goes outboard engine piece bass gives enough strength cutout area Genes plane called STP stands Square-Tipped-Plane thats exactly what hes got tip rib Ys-in suffices wingtip could have plans Genes plane subscribe Flying Lines newsletter $800 year gets lot information pictures plans Send money Flying Lines 1411 Bryant Ave Cottage Grove OR 97424 MACA newsletter seems coming out regularly again youre adventurous might try sending membership Frank McCune spends lot time money finding out latest manufacturers competitors does good job editing limited amount material sent membership Latest news John Gladfelter World Engines new Supertigre 5-36 will have lapped piston its setup gives 120 Model Aviation ERO ~UAU arn~ U I Fiberglass Fuselage Molded Interior Foam Cores & Metal Engine Mount 3-Formed Gears Hardware 65/s Span 40 fo 60 Englnea 4-6 R/C Charinola $15995THE V-TAILED NA Foam Cores & balsa skins Formed Gear & Canopy 40 fo 50 Englnsa 54 Wlngapan 590 Sq ORP, 167-B Maw HIghway North AmhyvlII NY 11701