CONTROL LINE AEROBATICS U story solutions things went wrong during past competitive season continues trend suggests may next year before finish part tale needs preface demonstrate took long find out what problem root situation run assumptions Having said may wondering guy going off deep end Im getting Problem Solving Stunt Fliers 101 Making assumptions will devastate program wont know fliers aware traps quicker accurately can solve problem Real World Example years ago working full-scale airplanes helping develop prototype electronic systems install execute test programs ran major assumption created serious problem working major aircraft firm install integrate series Black Box Systems components mounted large equipment racks shock-mounted individual units After airplane flew equipment malfunctions related loose components broken wiresa vibration problem situation analyzed turned out system mounting units assumption made design engineers reasoned shock-mounting massive racks would vibrate However result vibration period shifted very low cycle much higher because increased mass vibration period very close component resource internal components electronics started failing individual boxes retrofitted racks problems disappeared like magic Stunt fliers subject same condition Trying troubleshoot problems examining whole picture beginning Everything must subject scrutiny Im going relate assumptions situation plagued several years knowing Although Im going talk about care feeding pipes scenario about heat cooling same principles apply conventional setups set stage Im very conscious cooling particularly airflow interior model Likewise typically pay close attention balance inlet/outlet areas assumption would come back haunt acquiring knowledge about make pipe setups work looked everybody successful mentally noted what installation looked like Generally merged grouping configuration used first successful all-piped model SV-12 As far knew no real problems configuration However did notice could fly airplane cowling off no directed airflow over pipe aft coupler result engine did act predictably power down slightly locked-in feel gone put cowling back everything went sweet good lesson March 1998 129 Leroy Blacks Spitfires Windy Urtnowski plans Excellent construction gorgeous East Coast finish Awesome Limited Edition Chuck Holtzapples powered two OS 35s based foam Bee Jay components Limited Edition has 3/2 custom horns hand-rubbed Sig dope finish Fine detail work cowlings landing gear treatment TO C Three-peat Jason Shulman wins Masters Championships 1996 1991 3W engine Bill Hemple Jr wins 1997 IMAC National Championship 3W engine can enjoy same reliability performance 3W engines featuring auto advance electronic ignition light weight easy starting year warran ty economical gas operation odeilmotoren world adeFn Giant Scale Motors Call - more information complete line motors 24cc 240cc single four cylinders Exclusive US Representative factory authorized service far 3W Modelimotoren Desert Aircraft PO Box 18038 Tucson AZ 85731 Phone 520722-0607 Fax 520 722-5622 rn - because showed what happens heating problem system Notice use system pipes have deal entire packageless muffler unless its enclosed problem stage yet manifest itself completely getting good engine runs different engines pipes wasnt aware anything significantly wrong However aware having patch holes pipes others having fewer problems stage starting question everything except what doing making subtle changes areas still having persistent leaks after fewer 100 flights Since flying order 300 flights year Id change pipes fix go After engine runs excellent About time also began using Super Caudron series designs very deep drop cowling resultant internal airflow changes As pipes have evolved during last 10 years Stunt have become much reliable What brought problem surface like ballistic missile sub launch past Nationals team trials After contest checked pipes found major leaks didnt pick up quickly because PA 61 broad power tolerant factors wanted some flying waiting pipes repaired used older design pipe coated JB Weld epoxy good high-temperature gray-colored epoxy point story light bulb comes PA 61 ran extremely well older pipe slightly smaller designed 51 After eight wonderful runs happy until returned home checked pipe severely discolored front coupler back about six inches about same time Bill Werwage told interior pipes resin burned away hit hard major heat problem although Id wanting ignore pinpoint another matter needed find way check airflow really looked what I still didnt think could Maybe some holes would better However Id already tried pipe discolored unacceptable go doubt stop think set hair dryer cold fixed air inlet cowling reasonable fit dont want bleed air around coupling What found really surprised air literally dumping out bottom through hole over manifold coupling couldnt detect flow back So thought right track blocked hole tried again time small cutout aft major opening blasting out air Still no flow back blocked small hole tried again time /4-inch holes Id put side cowling cosmetics releasing air much surprise After blocking holes got strong air flow back Looking cowling shape suspected severe droop caused air flow follow bottom cowling curve exit openings After flying revised setup couldnt detect signs discoloration runs excellent always believe problem solved reliability will significantly increased Theres no magic procedure hair dryer direct air cowling worked well would recommend everyone surprised could show problem dont know exists gross level look airflow think should go surprise wasnt going should have refined level may able make adjustments improve situation Reading airflow dependent touch tried little heat yes raised some bubbles Next Im going look something such smoke could get airflow give better visual indication Any ideas out being smoker couldnt come up something convenient right away New Items As complement availability Brodak Nobler Kit Windy Urtnowski working construction video will available read column nothing better seeing fine craftsman showing tasks have to complete model Windy many-time Concours winner speaks worlds quality construction finishing Also available fiberglass cowling fit Nobler Contact Windy 93 Elliott Place Rutherford NJ 07070 Tel 201 896-8740 4130 Model Aviation ampions
Edition: Model Aviation - 1998/03
Page Numbers: 129, 130
Edition: Model Aviation - 1998/03
Page Numbers: 129, 130
CONTROL LINE AEROBATICS U story solutions things went wrong during past competitive season continues trend suggests may next year before finish part tale needs preface demonstrate took long find out what problem root situation run assumptions Having said may wondering guy going off deep end Im getting Problem Solving Stunt Fliers 101 Making assumptions will devastate program wont know fliers aware traps quicker accurately can solve problem Real World Example years ago working full-scale airplanes helping develop prototype electronic systems install execute test programs ran major assumption created serious problem working major aircraft firm install integrate series Black Box Systems components mounted large equipment racks shock-mounted individual units After airplane flew equipment malfunctions related loose components broken wiresa vibration problem situation analyzed turned out system mounting units assumption made design engineers reasoned shock-mounting massive racks would vibrate However result vibration period shifted very low cycle much higher because increased mass vibration period very close component resource internal components electronics started failing individual boxes retrofitted racks problems disappeared like magic Stunt fliers subject same condition Trying troubleshoot problems examining whole picture beginning Everything must subject scrutiny Im going relate assumptions situation plagued several years knowing Although Im going talk about care feeding pipes scenario about heat cooling same principles apply conventional setups set stage Im very conscious cooling particularly airflow interior model Likewise typically pay close attention balance inlet/outlet areas assumption would come back haunt acquiring knowledge about make pipe setups work looked everybody successful mentally noted what installation looked like Generally merged grouping configuration used first successful all-piped model SV-12 As far knew no real problems configuration However did notice could fly airplane cowling off no directed airflow over pipe aft coupler result engine did act predictably power down slightly locked-in feel gone put cowling back everything went sweet good lesson March 1998 129 Leroy Blacks Spitfires Windy Urtnowski plans Excellent construction gorgeous East Coast finish Awesome Limited Edition Chuck Holtzapples powered two OS 35s based foam Bee Jay components Limited Edition has 3/2 custom horns hand-rubbed Sig dope finish Fine detail work cowlings landing gear treatment TO C Three-peat Jason Shulman wins Masters Championships 1996 1991 3W engine Bill Hemple Jr wins 1997 IMAC National Championship 3W engine can enjoy same reliability performance 3W engines featuring auto advance electronic ignition light weight easy starting year warran ty economical gas operation odeilmotoren world adeFn Giant Scale Motors Call - more information complete line motors 24cc 240cc single four cylinders Exclusive US Representative factory authorized service far 3W Modelimotoren Desert Aircraft PO Box 18038 Tucson AZ 85731 Phone 520722-0607 Fax 520 722-5622 rn - because showed what happens heating problem system Notice use system pipes have deal entire packageless muffler unless its enclosed problem stage yet manifest itself completely getting good engine runs different engines pipes wasnt aware anything significantly wrong However aware having patch holes pipes others having fewer problems stage starting question everything except what doing making subtle changes areas still having persistent leaks after fewer 100 flights Since flying order 300 flights year Id change pipes fix go After engine runs excellent About time also began using Super Caudron series designs very deep drop cowling resultant internal airflow changes As pipes have evolved during last 10 years Stunt have become much reliable What brought problem surface like ballistic missile sub launch past Nationals team trials After contest checked pipes found major leaks didnt pick up quickly because PA 61 broad power tolerant factors wanted some flying waiting pipes repaired used older design pipe coated JB Weld epoxy good high-temperature gray-colored epoxy point story light bulb comes PA 61 ran extremely well older pipe slightly smaller designed 51 After eight wonderful runs happy until returned home checked pipe severely discolored front coupler back about six inches about same time Bill Werwage told interior pipes resin burned away hit hard major heat problem although Id wanting ignore pinpoint another matter needed find way check airflow really looked what I still didnt think could Maybe some holes would better However Id already tried pipe discolored unacceptable go doubt stop think set hair dryer cold fixed air inlet cowling reasonable fit dont want bleed air around coupling What found really surprised air literally dumping out bottom through hole over manifold coupling couldnt detect flow back So thought right track blocked hole tried again time small cutout aft major opening blasting out air Still no flow back blocked small hole tried again time /4-inch holes Id put side cowling cosmetics releasing air much surprise After blocking holes got strong air flow back Looking cowling shape suspected severe droop caused air flow follow bottom cowling curve exit openings After flying revised setup couldnt detect signs discoloration runs excellent always believe problem solved reliability will significantly increased Theres no magic procedure hair dryer direct air cowling worked well would recommend everyone surprised could show problem dont know exists gross level look airflow think should go surprise wasnt going should have refined level may able make adjustments improve situation Reading airflow dependent touch tried little heat yes raised some bubbles Next Im going look something such smoke could get airflow give better visual indication Any ideas out being smoker couldnt come up something convenient right away New Items As complement availability Brodak Nobler Kit Windy Urtnowski working construction video will available read column nothing better seeing fine craftsman showing tasks have to complete model Windy many-time Concours winner speaks worlds quality construction finishing Also available fiberglass cowling fit Nobler Contact Windy 93 Elliott Place Rutherford NJ 07070 Tel 201 896-8740 4130 Model Aviation ampions
