RADIO CONTROL PYLON RACING U Fl WOW lot has happening pylon racing lately guess soapbox time again seems proposal start another racing event time will event replace 15-size Quarter Midget event Appar ently some now want go another 40-size engineonly time want put 400-square-inch four-pound airplane Some pushing new event same ones quit Formula because became too fast andlor too ex pensive What need another 40-size event reprint letter NMPRA newsletter speaks itself No 18000 rpm Quickie-500 engine will able compete Quarter Midget way new proposed rules written says Henry Nelson engine designer creator virtually high-performance pylon motor raced today world According initiators QM proposal basically four pounds 400-squareinch front-intake 40 manufacturer muffler prop flown Formula course looking replace current QM rules because engines being pushed breaking point [there is] dissension Q-500 due experienced flier wants go fast willing spend money Joe Average left out because lack skills desire spend money stay competitive involved racer surface appears Nelson Q-500 motor would competitive event wont Im appalled vocal minority within Contest Board can steamroller through elimination entire event favor event has never flown less years time elite few Contest Board verge disenfran chising entire class 15 Quarter Midget fliers Whatever faults 15 QM event solution unlikely another 40-size event Its unlikely event has never raced Regardless people butcher fellow competitors rules can build engine suit already produce engine fits rules front intake/rear exhaust little modification can turn QM Death Engine Itll Death Engine because will cause immediate death engine FIRE engine properly modified tuned muffler 15% will run 28000 rpm carbon prop allowed 40 QM Thats about same performance piped FAI 40 80-20 fuel engine will cheap nor will last forever 28000 rpm its engine would evolve anyway may well start Q-500 engine going competitive event idea anyone could compete Q-500 engine naive begin So Pass rules get out checkbook Thanks Henry special month Dave Shadel Henry Nelson pass some tips Formula prop first step quest better performance will put prop balancer exactly comes bag blade hits table hard mix glue prop Only props close correct balance should rework candidates Next cut prop 8 inches long would start 8/4 x 7/2 Rev-up nine-inch Rev-ups require far work worth After cutting length balance Remember almost perfect right out bag Run cut-down unbalanced squaretipped prop engine will find some props tach very nicely configuration will require little further rework get rpm required props well off mark can become glue mixing sticks worry too much about tip shape Ive run em square raked back elliptical Take pick prop good almost nothing will hurt As long dealing natural materials will case Most pieces wood wont tolerate 100-inch thickness station five get youre lucky once again have run props ones tach up wont require lot thinning As far airfoil goes record-setting Formula props Richard Verano have maximum camber high point moved aft Another point remember shorter prop worse acceleration will off start line off corners engine Most engines wont seal properly oil film cylinderso try testing seal Pinch top makes little difference well engine holds compression immediately after shutdown bench run fine correct torque head bolts 14 inch-pounds After initial assembly run engine retorque still hot should never have retorque again unless remove head engine run sufficiently lean cause head loosening guarantee time new piston/cylinder/head Forehead clearance usually run 007-inch 010-inch clearance depending weather higher head ralsed mushier peak setting becomes engine pulling plug element out chamber undercompressed also generate less horsepower head up Rather raise head break-in go lower nitro 30% works really well can t figure out run 65% nitro lower nitro content until can racing needle setting trying run fuel ignitors head up too high cold day trouble may need richer cold day depending humidity Ever notice needle setting gets progressively leaner day warms up Think about plug element pulled out plug engine looking heat Lower head generate power Typical good runs GloBee plug will wrinlde element break glass seal will typically turn light chocolate brown setup correctfuel compres sion needle GloBee will also help stabilize jumpy engine some conditions start about 60 seconds dont wish carry extra weight fuel load longer running time ground run test-fly conditions same race also fly 10 laps Flying just hurts equipment Henry speak frequently about improvements constant state-of-product improvement always hand learning curve N40 Fl no difficult other high-nitro engine couldnt run Tigres K&Bs OSs youre probably going struggle everything else too head Cylinder-head fit liner critical have seen difference several hundred rpm between loose-fitting head correct no such thing size fits head should fit liner no rattling around tight have force Loose-fitting heads equal lower performance Never reuse old heads have burned-up worn-out piston/cylinder its time new upper end its time new head well Continued page 82 July1993 77 new 0-500 motor designed World Champion Dub Jett first placed market spring sure check out should really good customers request will mill sides upper case cylinder head cheek cowl clearance dont use file plug Formula use standard GloBee plugs used wish GbBees 50 cents reality priced follows Standard $285 Heavy Duty $3 GloBee $450 Plug nuts GbBees $5 reusable Correct running will yield plug light tan face depending oil fuel well-scrambled element may may glow after use element frosted white chalky youre too lean have seen plugs screwed tight pushes plug seat combustion chamber must avoid correct torque plug 25 inch-pounds undercompressed setup may beneficial actually pull element out plug 1A6 inch what trying accomplish running engine over top anyway doing prior run lot less damaging engine liner smaller intake port opposite exhaust called boost port intake ports either side liner called main transfer ports reason making boost smaller bottom larger port covered piston bottom dead center smaller port retains velocity better aluminum liners vastly superior brass thus far must run differ ently brass best results An undercompressed setup will work aluminum have run engine variety different port heights have found little difference Consider piston have used two different piston alloys production Neither appears significantly better worse other have also tried variety others appears better rod have fewer 20 rod failuresall early examples Out few thousand rods Id say isnt too bad Several failures caused plated crankshaft plating peeled causing rod seizure Since couple dozen engines plated crank problem has gone away failures have seen recently occurred people nose over takeoff shaft-run engine load up engine fuel keep hitting starter couple runs later rod lets go immediately its rods fault User error lot prevalent defective parts backplate rotor pin disc valve setup history has occasional chewing-the-backplate problem SuperTigres did badly aware problem Until started using colored anodize almost no knew Most problems materials fits finishes have solved current backplate fairly reliable Nonetheless fairly reliable good enough new backplate/rotor/ pin design should eliminate problems once nearly finished rotor-dishing problem caused users routinely removed rotor inserting object through intake beating rotor/pin assembly remove Lubrication has nothing problem piped engine FAI action pipe prevents rotor contacting backplate closed side disc-backplate Hope helps clear up some points Thanks Dave Henry help As recap last month what Lloyd Buruham has say about Lyle Larsons new videos Lyle has made three-tape 10-hour version everything ever wanted know about building setting up racing plane unquestionably thorough complete video its kind Lyle keeps no secrets shows step-bystep glue-joint-by-glue-joint everything unpacking wing cores setting needle test-flying plane first time No matter planes have built guarantee will learn something master builder methods shortcuts construction finishing alone worth $85 price camera work good detailed Lyle narrates minute 10 hours painstaking detail sitting right next beginner tape must have built sport plane could build first-class Formula after viewing tape Lyle goes show way applying primer masking painting buffing out finished product hes done yet rebuilds Nelson engine sets up bladder-regulator system shows carves prop have ways doing things Lyle definitely has very successful what does thanks him taking time effort make video definite must see Thanks Lloyd information call Lyle 714 365-1155 Seeya odel Aviation ylonlHagerfact 005-inch difference port heights equals about 15 degrees timingvirtually Continued paqe 77no change So really matters very little
Edition: Model Aviation - 1993/07
Page Numbers: 77, 82
RADIO CONTROL PYLON RACING U Fl WOW lot has happening pylon racing lately guess soapbox time again seems proposal start another racing event time will event replace 15-size Quarter Midget event Appar ently some now want go another 40-size engineonly time want put 400-square-inch four-pound airplane Some pushing new event same ones quit Formula because became too fast andlor too ex pensive What need another 40-size event reprint letter NMPRA newsletter speaks itself No 18000 rpm Quickie-500 engine will able compete Quarter Midget way new proposed rules written says Henry Nelson engine designer creator virtually high-performance pylon motor raced today world According initiators QM proposal basically four pounds 400-squareinch front-intake 40 manufacturer muffler prop flown Formula course looking replace current QM rules because engines being pushed breaking point [there is] dissension Q-500 due experienced flier wants go fast willing spend money Joe Average left out because lack skills desire spend money stay competitive involved racer surface appears Nelson Q-500 motor would competitive event wont Im appalled vocal minority within Contest Board can steamroller through elimination entire event favor event has never flown less years time elite few Contest Board verge disenfran chising entire class 15 Quarter Midget fliers Whatever faults 15 QM event solution unlikely another 40-size event Its unlikely event has never raced Regardless people butcher fellow competitors rules can build engine suit already produce engine fits rules front intake/rear exhaust little modification can turn QM Death Engine Itll Death Engine because will cause immediate death engine FIRE engine properly modified tuned muffler 15% will run 28000 rpm carbon prop allowed 40 QM Thats about same performance piped FAI 40 80-20 fuel engine will cheap nor will last forever 28000 rpm its engine would evolve anyway may well start Q-500 engine going competitive event idea anyone could compete Q-500 engine naive begin So Pass rules get out checkbook Thanks Henry special month Dave Shadel Henry Nelson pass some tips Formula prop first step quest better performance will put prop balancer exactly comes bag blade hits table hard mix glue prop Only props close correct balance should rework candidates Next cut prop 8 inches long would start 8/4 x 7/2 Rev-up nine-inch Rev-ups require far work worth After cutting length balance Remember almost perfect right out bag Run cut-down unbalanced squaretipped prop engine will find some props tach very nicely configuration will require little further rework get rpm required props well off mark can become glue mixing sticks worry too much about tip shape Ive run em square raked back elliptical Take pick prop good almost nothing will hurt As long dealing natural materials will case Most pieces wood wont tolerate 100-inch thickness station five get youre lucky once again have run props ones tach up wont require lot thinning As far airfoil goes record-setting Formula props Richard Verano have maximum camber high point moved aft Another point remember shorter prop worse acceleration will off start line off corners engine Most engines wont seal properly oil film cylinderso try testing seal Pinch top makes little difference well engine holds compression immediately after shutdown bench run fine correct torque head bolts 14 inch-pounds After initial assembly run engine retorque still hot should never have retorque again unless remove head engine run sufficiently lean cause head loosening guarantee time new piston/cylinder/head Forehead clearance usually run 007-inch 010-inch clearance depending weather higher head ralsed mushier peak setting becomes engine pulling plug element out chamber undercompressed also generate less horsepower head up Rather raise head break-in go lower nitro 30% works really well can t figure out run 65% nitro lower nitro content until can racing needle setting trying run fuel ignitors head up too high cold day trouble may need richer cold day depending humidity Ever notice needle setting gets progressively leaner day warms up Think about plug element pulled out plug engine looking heat Lower head generate power Typical good runs GloBee plug will wrinlde element break glass seal will typically turn light chocolate brown setup correctfuel compres sion needle GloBee will also help stabilize jumpy engine some conditions start about 60 seconds dont wish carry extra weight fuel load longer running time ground run test-fly conditions same race also fly 10 laps Flying just hurts equipment Henry speak frequently about improvements constant state-of-product improvement always hand learning curve N40 Fl no difficult other high-nitro engine couldnt run Tigres K&Bs OSs youre probably going struggle everything else too head Cylinder-head fit liner critical have seen difference several hundred rpm between loose-fitting head correct no such thing size fits head should fit liner no rattling around tight have force Loose-fitting heads equal lower performance Never reuse old heads have burned-up worn-out piston/cylinder its time new upper end its time new head well Continued page 82 July1993 77 new 0-500 motor designed World Champion Dub Jett first placed market spring sure check out should really good customers request will mill sides upper case cylinder head cheek cowl clearance dont use file plug Formula use standard GloBee plugs used wish GbBees 50 cents reality priced follows Standard $285 Heavy Duty $3 GloBee $450 Plug nuts GbBees $5 reusable Correct running will yield plug light tan face depending oil fuel well-scrambled element may may glow after use element frosted white chalky youre too lean have seen plugs screwed tight pushes plug seat combustion chamber must avoid correct torque plug 25 inch-pounds undercompressed setup may beneficial actually pull element out plug 1A6 inch what trying accomplish running engine over top anyway doing prior run lot less damaging engine liner smaller intake port opposite exhaust called boost port intake ports either side liner called main transfer ports reason making boost smaller bottom larger port covered piston bottom dead center smaller port retains velocity better aluminum liners vastly superior brass thus far must run differ ently brass best results An undercompressed setup will work aluminum have run engine variety different port heights have found little difference Consider piston have used two different piston alloys production Neither appears significantly better worse other have also tried variety others appears better rod have fewer 20 rod failuresall early examples Out few thousand rods Id say isnt too bad Several failures caused plated crankshaft plating peeled causing rod seizure Since couple dozen engines plated crank problem has gone away failures have seen recently occurred people nose over takeoff shaft-run engine load up engine fuel keep hitting starter couple runs later rod lets go immediately its rods fault User error lot prevalent defective parts backplate rotor pin disc valve setup history has occasional chewing-the-backplate problem SuperTigres did badly aware problem Until started using colored anodize almost no knew Most problems materials fits finishes have solved current backplate fairly reliable Nonetheless fairly reliable good enough new backplate/rotor/ pin design should eliminate problems once nearly finished rotor-dishing problem caused users routinely removed rotor inserting object through intake beating rotor/pin assembly remove Lubrication has nothing problem piped engine FAI action pipe prevents rotor contacting backplate closed side disc-backplate Hope helps clear up some points Thanks Dave Henry help As recap last month what Lloyd Buruham has say about Lyle Larsons new videos Lyle has made three-tape 10-hour version everything ever wanted know about building setting up racing plane unquestionably thorough complete video its kind Lyle keeps no secrets shows step-bystep glue-joint-by-glue-joint everything unpacking wing cores setting needle test-flying plane first time No matter planes have built guarantee will learn something master builder methods shortcuts construction finishing alone worth $85 price camera work good detailed Lyle narrates minute 10 hours painstaking detail sitting right next beginner tape must have built sport plane could build first-class Formula after viewing tape Lyle goes show way applying primer masking painting buffing out finished product hes done yet rebuilds Nelson engine sets up bladder-regulator system shows carves prop have ways doing things Lyle definitely has very successful what does thanks him taking time effort make video definite must see Thanks Lloyd information call Lyle 714 365-1155 Seeya odel Aviation ylonlHagerfact 005-inch difference port heights equals about 15 degrees timingvirtually Continued paqe 77no change So really matters very little