Free Flight Indoor Bud Tenny BE PREPARED Now Indoor season winding down may have Nats US Indoor Chain pionships look forward have new freshly-repaired models need get trimmed big meets come Flight test profiles really serious about getting out Indoor models need check several things simplest in-flight data can take average propeller rpm much meaningful measurement plot rpm vs time Once know normal cruise rpm have quick check models condition once lost contest because failed check trim model after noting increase cruise rpm failed recognize importance what saw Nit-nickine tests Almost kind model testing can done low-ceiling sites using right techniques Average rpm rpm vs time measurements can made flight Level flight torque can measured site room model circle undisturbed Special precautions Whenever start testing program important sure models CO center gravity doesnt change during tests youre testing different props props must weigh same have ballast light er props Always use same weight rubber will fly two reasons first changing rubber weight changes wing loading Second models CG isnt midway between rubber hooks changing rubber weight changes models balance final pre caution learn repeatable winding tech nique using torquemeter Winding techniques Figure 1 shows typical winding/unwinding torque curve Indoor motor top line reading shown torquemeter used winding stooge during windup lower line shows what happens un wind vertical line between curves shows what happens follow winding technique discussed below Wind slowly Always wind motor slowly deliberately watching torquemeter Begin winding freshly-lub ricated motor stretched about six times normal motor length As progress up curve shown Figure 1 turn winder handle will cause torque rise rapidly Begin reducing amount stretch torque rises rapidly come torque readings will drop off somewhat time reach normal motor length torque should fairly high level Hold motor winding torque will drop along vertical line stopping lower curve time have rubber motor wound known torque level has rested stabilized torque differ ence between windup full con test windup maximum torque level reached Test-flying windups can less full blast reduce stress motor However important use standard windup flying know what expect windup key technique windup goes known stress level regardless actual number turns Once torque has stabilized after windup slowly unwind required Continued nnee 147 happy know volume three now available publication SAM Chapter 35 England availa ble SAM Speaks 2538 N Spurgeon Street Santa Ana CA 92706 Price seven dollars postpaid A-J Interceptor As kid growing up southern Idaho didnt know what hobby shop let alone ever see source model supplies local variety store located 10 miles away town 1500 people Imagine ex citement father returned long trip bringing two A-J Intercep tors case dont remember A-J American Junior Army Interceptor catapult-launched all-balsa glider unique folding wing feature rotating wing leading edge down 900 folding two wing halves rearward very streamlined projectile could shot skyward heretofore unat tainable heights rubberband-and stick catapult Upon reaching apex its trajectory thus slowing ac ceptable airspeed wings spread rubberband power model glid ed gracefully earth What thrill Now through efforts A-J Fun Pack PO Box 548 Oregon City OR 97045 may relive days yesteryear flying own A-J Interceptor recently pleasure inspecting newly-produced models dur ing visit Clarence Bull Clarence involved producing thembut Im sure what capacity Never ask sales man leading question Im happy report quality product very high receives special attention insure proper adjustment functioning wing-fold mechanism Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 FF Indoor/Tenny Continued page 59 launch torque allowing torque set tle go Test profiles Figure 2 shows typical unwinding torque curve three values marked curve copy lower part Figure 1 Launch torque actual torque developed motor launch very critical number youre flying ceiling isnt safe ceiling-scrubbing rafter-banging given situation same model/prop rubber combo will climb almost exactly same distance time use same launch torque standard wind up Level flight torque torque model maintains same alti tude Another important torque value what call critical torque Critical torque torque level will pull model critical torque reached properly-trimmed model pitches down underpowered glide Since motor cant keep rpm up model pushes prop loses altitude rapidly Figure 3 shows flight profile alti tude vs time model doesnt touch ceiling walls Figure 4 shows typical rpm/time plot Note rpm reaches nearly constant value doesnt change unless critical torque reached Once critical torque reached rpm will change much changes meaningless since flight essen tially finished What new model built existing proven design will probably have CG good location should have good idea about rubber size re quired Really left finetune trim get right site must free major drift turbu lence Without calm air almost impossible make good measurements will want measure level flight torque cruise rpm both same time Make some short test hops low launch torque trying locate torque makes model climb slightly level out real test flights launch model about knee height launch torque makes climb no higher can reach careful avoid generating turbulence move out flight circle after launch model levels out catch measure July1985 147 torque Record torque rpm reading taken just before caught model Make small change trim repeat rpm/torque measurements best trim will setting gives both lowest rpm lowest level-flight torque model slightly under-elevated needs inci dence wing will have slightly higher rpm approximately same level flight torque properly-trimmed model As incidence increased rpm torque will drop lower overelevated model rpm lower good trim torque will higher level-flight torque increases overelevated model because higher torque needed overcome higher drag extra wing incidence Actually model will start sinking faster good trim soon level flight ceases full flight will take longer properly trimmed model reach level flight either under- over-elevated model Wrap-up Heres holds together peak altitude flight depends launch torque altitude vs time curve levels off level-flight torque Unless air temperature air inversion well talk about next time inter venes model will descend slowly torque decreases motor runs out turns before touchdown reaches critical torque model will come down much come several other test procedures allow get trim big meet Im out room Next time Bud Tenny Box 545 Richardson TX 75080 CGS Hawk/Kruse Continued page 63 beneath smooth out wrinkles Three coats thinned nitrate dope top tissue trim should sufficient seal surfaces detailing including seat celluloid windscreens wheel pants struts rigging dummy engine can now added complete model make come alive Flying Balance plane shown plan adding lead shot and/or clay ballast box dont like test glide CO-2powered models because doesnt give much feel ship going perform under power Wait calm evening find softest grass surface can set motor low power setting give gas charge last filler cartridge Flick prop get motor started remember its apusher aim model spot about 50 ft front give gentle toss settles ground stalling diving crease gas charge no liquid yet please try again should show slight tendency climb gently turn right turns too tightly bend rudder just shade left try again power pattern seems safe increase motor speed bit watch climb right come back overhead full gas charge model being hand launched should get flights rang ing 45 sec updepending buoyant air isand quality CO-2 charge Hawk has enjoyable Free Flight Scale ships Ive built number years unique enough elicit both admiration questions spectatorsand competitive enough win Scale contest nation decide build have questions comments please write Larry Kruse Box 1137 Liberal KS 67901 Ill happy supply documentation infor mation cost CL Aerobatics/Fancher Continued page 64 able practical terms CG aft G/L center lift although technically stable rapidly becomes too sensitive RC Ts & Caps Super Quality.Super Price! TSHIRTS 50% cotloni5O% polyester complete range sizes RC hobbiest $595 Styte Ais yellnw hold black design Style B availahle navy white white navy CAPS tits Adjustable back mesh sides Only $595 SPECIAL COMBO OFFER Matching shirt cap set $995! shirt cap per set ORDER TODAY Send check money order US Please indicate size style cnlor Include $2 postage handling per item Florida residents add 5% sales tax Allew 4-6 weeks delivery IS YOUR CLUB LOOKING FOR FUNDRAISER ASK ABOUT OUR CLUB DISCOUNT PROGRAM RC NOVELTIES PO BOX 840205 PEMBROKE PINES FLORIDA 33084 TICK OFF TIMER Now Available 0-20 Seconds Fuel shut off Flood Off Auto rudder function Weight V oz Fuel line included EXTRA FUEL LINE TUmINGSO- ft DIRECT ORDER ON LV Send Cash Check MD COD $3 extra Calif 6% JOHN TATONE 62 BELHAVEN AVE DALY CITY CA 94015 Limited supply 148 Model Aviation faster Jim Clem coined appropriate phrasethe model becomes lead sled has push prop
Edition: Model Aviation - 1985/07
Page Numbers: 59, 147, 148
Free Flight Indoor Bud Tenny BE PREPARED Now Indoor season winding down may have Nats US Indoor Chain pionships look forward have new freshly-repaired models need get trimmed big meets come Flight test profiles really serious about getting out Indoor models need check several things simplest in-flight data can take average propeller rpm much meaningful measurement plot rpm vs time Once know normal cruise rpm have quick check models condition once lost contest because failed check trim model after noting increase cruise rpm failed recognize importance what saw Nit-nickine tests Almost kind model testing can done low-ceiling sites using right techniques Average rpm rpm vs time measurements can made flight Level flight torque can measured site room model circle undisturbed Special precautions Whenever start testing program important sure models CO center gravity doesnt change during tests youre testing different props props must weigh same have ballast light er props Always use same weight rubber will fly two reasons first changing rubber weight changes wing loading Second models CG isnt midway between rubber hooks changing rubber weight changes models balance final pre caution learn repeatable winding tech nique using torquemeter Winding techniques Figure 1 shows typical winding/unwinding torque curve Indoor motor top line reading shown torquemeter used winding stooge during windup lower line shows what happens un wind vertical line between curves shows what happens follow winding technique discussed below Wind slowly Always wind motor slowly deliberately watching torquemeter Begin winding freshly-lub ricated motor stretched about six times normal motor length As progress up curve shown Figure 1 turn winder handle will cause torque rise rapidly Begin reducing amount stretch torque rises rapidly come torque readings will drop off somewhat time reach normal motor length torque should fairly high level Hold motor winding torque will drop along vertical line stopping lower curve time have rubber motor wound known torque level has rested stabilized torque differ ence between windup full con test windup maximum torque level reached Test-flying windups can less full blast reduce stress motor However important use standard windup flying know what expect windup key technique windup goes known stress level regardless actual number turns Once torque has stabilized after windup slowly unwind required Continued nnee 147 happy know volume three now available publication SAM Chapter 35 England availa ble SAM Speaks 2538 N Spurgeon Street Santa Ana CA 92706 Price seven dollars postpaid A-J Interceptor As kid growing up southern Idaho didnt know what hobby shop let alone ever see source model supplies local variety store located 10 miles away town 1500 people Imagine ex citement father returned long trip bringing two A-J Intercep tors case dont remember A-J American Junior Army Interceptor catapult-launched all-balsa glider unique folding wing feature rotating wing leading edge down 900 folding two wing halves rearward very streamlined projectile could shot skyward heretofore unat tainable heights rubberband-and stick catapult Upon reaching apex its trajectory thus slowing ac ceptable airspeed wings spread rubberband power model glid ed gracefully earth What thrill Now through efforts A-J Fun Pack PO Box 548 Oregon City OR 97045 may relive days yesteryear flying own A-J Interceptor recently pleasure inspecting newly-produced models dur ing visit Clarence Bull Clarence involved producing thembut Im sure what capacity Never ask sales man leading question Im happy report quality product very high receives special attention insure proper adjustment functioning wing-fold mechanism Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 FF Indoor/Tenny Continued page 59 launch torque allowing torque set tle go Test profiles Figure 2 shows typical unwinding torque curve three values marked curve copy lower part Figure 1 Launch torque actual torque developed motor launch very critical number youre flying ceiling isnt safe ceiling-scrubbing rafter-banging given situation same model/prop rubber combo will climb almost exactly same distance time use same launch torque standard wind up Level flight torque torque model maintains same alti tude Another important torque value what call critical torque Critical torque torque level will pull model critical torque reached properly-trimmed model pitches down underpowered glide Since motor cant keep rpm up model pushes prop loses altitude rapidly Figure 3 shows flight profile alti tude vs time model doesnt touch ceiling walls Figure 4 shows typical rpm/time plot Note rpm reaches nearly constant value doesnt change unless critical torque reached Once critical torque reached rpm will change much changes meaningless since flight essen tially finished What new model built existing proven design will probably have CG good location should have good idea about rubber size re quired Really left finetune trim get right site must free major drift turbu lence Without calm air almost impossible make good measurements will want measure level flight torque cruise rpm both same time Make some short test hops low launch torque trying locate torque makes model climb slightly level out real test flights launch model about knee height launch torque makes climb no higher can reach careful avoid generating turbulence move out flight circle after launch model levels out catch measure July1985 147 torque Record torque rpm reading taken just before caught model Make small change trim repeat rpm/torque measurements best trim will setting gives both lowest rpm lowest level-flight torque model slightly under-elevated needs inci dence wing will have slightly higher rpm approximately same level flight torque properly-trimmed model As incidence increased rpm torque will drop lower overelevated model rpm lower good trim torque will higher level-flight torque increases overelevated model because higher torque needed overcome higher drag extra wing incidence Actually model will start sinking faster good trim soon level flight ceases full flight will take longer properly trimmed model reach level flight either under- over-elevated model Wrap-up Heres holds together peak altitude flight depends launch torque altitude vs time curve levels off level-flight torque Unless air temperature air inversion well talk about next time inter venes model will descend slowly torque decreases motor runs out turns before touchdown reaches critical torque model will come down much come several other test procedures allow get trim big meet Im out room Next time Bud Tenny Box 545 Richardson TX 75080 CGS Hawk/Kruse Continued page 63 beneath smooth out wrinkles Three coats thinned nitrate dope top tissue trim should sufficient seal surfaces detailing including seat celluloid windscreens wheel pants struts rigging dummy engine can now added complete model make come alive Flying Balance plane shown plan adding lead shot and/or clay ballast box dont like test glide CO-2powered models because doesnt give much feel ship going perform under power Wait calm evening find softest grass surface can set motor low power setting give gas charge last filler cartridge Flick prop get motor started remember its apusher aim model spot about 50 ft front give gentle toss settles ground stalling diving crease gas charge no liquid yet please try again should show slight tendency climb gently turn right turns too tightly bend rudder just shade left try again power pattern seems safe increase motor speed bit watch climb right come back overhead full gas charge model being hand launched should get flights rang ing 45 sec updepending buoyant air isand quality CO-2 charge Hawk has enjoyable Free Flight Scale ships Ive built number years unique enough elicit both admiration questions spectatorsand competitive enough win Scale contest nation decide build have questions comments please write Larry Kruse Box 1137 Liberal KS 67901 Ill happy supply documentation infor mation cost CL Aerobatics/Fancher Continued page 64 able practical terms CG aft G/L center lift although technically stable rapidly becomes too sensitive RC Ts & Caps Super Quality.Super Price! TSHIRTS 50% cotloni5O% polyester complete range sizes RC hobbiest $595 Styte Ais yellnw hold black design Style B availahle navy white white navy CAPS tits Adjustable back mesh sides Only $595 SPECIAL COMBO OFFER Matching shirt cap set $995! shirt cap per set ORDER TODAY Send check money order US Please indicate size style cnlor Include $2 postage handling per item Florida residents add 5% sales tax Allew 4-6 weeks delivery IS YOUR CLUB LOOKING FOR FUNDRAISER ASK ABOUT OUR CLUB DISCOUNT PROGRAM RC NOVELTIES PO BOX 840205 PEMBROKE PINES FLORIDA 33084 TICK OFF TIMER Now Available 0-20 Seconds Fuel shut off Flood Off Auto rudder function Weight V oz Fuel line included EXTRA FUEL LINE TUmINGSO- ft DIRECT ORDER ON LV Send Cash Check MD COD $3 extra Calif 6% JOHN TATONE 62 BELHAVEN AVE DALY CITY CA 94015 Limited supply 148 Model Aviation faster Jim Clem coined appropriate phrasethe model becomes lead sled has push prop
Edition: Model Aviation - 1985/07
Page Numbers: 59, 147, 148
Free Flight Indoor Bud Tenny BE PREPARED Now Indoor season winding down may have Nats US Indoor Chain pionships look forward have new freshly-repaired models need get trimmed big meets come Flight test profiles really serious about getting out Indoor models need check several things simplest in-flight data can take average propeller rpm much meaningful measurement plot rpm vs time Once know normal cruise rpm have quick check models condition once lost contest because failed check trim model after noting increase cruise rpm failed recognize importance what saw Nit-nickine tests Almost kind model testing can done low-ceiling sites using right techniques Average rpm rpm vs time measurements can made flight Level flight torque can measured site room model circle undisturbed Special precautions Whenever start testing program important sure models CO center gravity doesnt change during tests youre testing different props props must weigh same have ballast light er props Always use same weight rubber will fly two reasons first changing rubber weight changes wing loading Second models CG isnt midway between rubber hooks changing rubber weight changes models balance final pre caution learn repeatable winding tech nique using torquemeter Winding techniques Figure 1 shows typical winding/unwinding torque curve Indoor motor top line reading shown torquemeter used winding stooge during windup lower line shows what happens un wind vertical line between curves shows what happens follow winding technique discussed below Wind slowly Always wind motor slowly deliberately watching torquemeter Begin winding freshly-lub ricated motor stretched about six times normal motor length As progress up curve shown Figure 1 turn winder handle will cause torque rise rapidly Begin reducing amount stretch torque rises rapidly come torque readings will drop off somewhat time reach normal motor length torque should fairly high level Hold motor winding torque will drop along vertical line stopping lower curve time have rubber motor wound known torque level has rested stabilized torque differ ence between windup full con test windup maximum torque level reached Test-flying windups can less full blast reduce stress motor However important use standard windup flying know what expect windup key technique windup goes known stress level regardless actual number turns Once torque has stabilized after windup slowly unwind required Continued nnee 147 happy know volume three now available publication SAM Chapter 35 England availa ble SAM Speaks 2538 N Spurgeon Street Santa Ana CA 92706 Price seven dollars postpaid A-J Interceptor As kid growing up southern Idaho didnt know what hobby shop let alone ever see source model supplies local variety store located 10 miles away town 1500 people Imagine ex citement father returned long trip bringing two A-J Intercep tors case dont remember A-J American Junior Army Interceptor catapult-launched all-balsa glider unique folding wing feature rotating wing leading edge down 900 folding two wing halves rearward very streamlined projectile could shot skyward heretofore unat tainable heights rubberband-and stick catapult Upon reaching apex its trajectory thus slowing ac ceptable airspeed wings spread rubberband power model glid ed gracefully earth What thrill Now through efforts A-J Fun Pack PO Box 548 Oregon City OR 97045 may relive days yesteryear flying own A-J Interceptor recently pleasure inspecting newly-produced models dur ing visit Clarence Bull Clarence involved producing thembut Im sure what capacity Never ask sales man leading question Im happy report quality product very high receives special attention insure proper adjustment functioning wing-fold mechanism Clarence Haught 3226 Honeysuckle Dr Coeur dAlene ID 83814 FF Indoor/Tenny Continued page 59 launch torque allowing torque set tle go Test profiles Figure 2 shows typical unwinding torque curve three values marked curve copy lower part Figure 1 Launch torque actual torque developed motor launch very critical number youre flying ceiling isnt safe ceiling-scrubbing rafter-banging given situation same model/prop rubber combo will climb almost exactly same distance time use same launch torque standard wind up Level flight torque torque model maintains same alti tude Another important torque value what call critical torque Critical torque torque level will pull model critical torque reached properly-trimmed model pitches down underpowered glide Since motor cant keep rpm up model pushes prop loses altitude rapidly Figure 3 shows flight profile alti tude vs time model doesnt touch ceiling walls Figure 4 shows typical rpm/time plot Note rpm reaches nearly constant value doesnt change unless critical torque reached Once critical torque reached rpm will change much changes meaningless since flight essen tially finished What new model built existing proven design will probably have CG good location should have good idea about rubber size re quired Really left finetune trim get right site must free major drift turbu lence Without calm air almost impossible make good measurements will want measure level flight torque cruise rpm both same time Make some short test hops low launch torque trying locate torque makes model climb slightly level out real test flights launch model about knee height launch torque makes climb no higher can reach careful avoid generating turbulence move out flight circle after launch model levels out catch measure July1985 147 torque Record torque rpm reading taken just before caught model Make small change trim repeat rpm/torque measurements best trim will setting gives both lowest rpm lowest level-flight torque model slightly under-elevated needs inci dence wing will have slightly higher rpm approximately same level flight torque properly-trimmed model As incidence increased rpm torque will drop lower overelevated model rpm lower good trim torque will higher level-flight torque increases overelevated model because higher torque needed overcome higher drag extra wing incidence Actually model will start sinking faster good trim soon level flight ceases full flight will take longer properly trimmed model reach level flight either under- over-elevated model Wrap-up Heres holds together peak altitude flight depends launch torque altitude vs time curve levels off level-flight torque Unless air temperature air inversion well talk about next time inter venes model will descend slowly torque decreases motor runs out turns before touchdown reaches critical torque model will come down much come several other test procedures allow get trim big meet Im out room Next time Bud Tenny Box 545 Richardson TX 75080 CGS Hawk/Kruse Continued page 63 beneath smooth out wrinkles Three coats thinned nitrate dope top tissue trim should sufficient seal surfaces detailing including seat celluloid windscreens wheel pants struts rigging dummy engine can now added complete model make come alive Flying Balance plane shown plan adding lead shot and/or clay ballast box dont like test glide CO-2powered models because doesnt give much feel ship going perform under power Wait calm evening find softest grass surface can set motor low power setting give gas charge last filler cartridge Flick prop get motor started remember its apusher aim model spot about 50 ft front give gentle toss settles ground stalling diving crease gas charge no liquid yet please try again should show slight tendency climb gently turn right turns too tightly bend rudder just shade left try again power pattern seems safe increase motor speed bit watch climb right come back overhead full gas charge model being hand launched should get flights rang ing 45 sec updepending buoyant air isand quality CO-2 charge Hawk has enjoyable Free Flight Scale ships Ive built number years unique enough elicit both admiration questions spectatorsand competitive enough win Scale contest nation decide build have questions comments please write Larry Kruse Box 1137 Liberal KS 67901 Ill happy supply documentation infor mation cost CL Aerobatics/Fancher Continued page 64 able practical terms CG aft G/L center lift although technically stable rapidly becomes too sensitive RC Ts & Caps Super Quality.Super Price! TSHIRTS 50% cotloni5O% polyester complete range sizes RC hobbiest $595 Styte Ais yellnw hold black design Style B availahle navy white white navy CAPS tits Adjustable back mesh sides Only $595 SPECIAL COMBO OFFER Matching shirt cap set $995! shirt cap per set ORDER TODAY Send check money order US Please indicate size style cnlor Include $2 postage handling per item Florida residents add 5% sales tax Allew 4-6 weeks delivery IS YOUR CLUB LOOKING FOR FUNDRAISER ASK ABOUT OUR CLUB DISCOUNT PROGRAM RC NOVELTIES PO BOX 840205 PEMBROKE PINES FLORIDA 33084 TICK OFF TIMER Now Available 0-20 Seconds Fuel shut off Flood Off Auto rudder function Weight V oz Fuel line included EXTRA FUEL LINE TUmINGSO- ft DIRECT ORDER ON LV Send Cash Check MD COD $3 extra Calif 6% JOHN TATONE 62 BELHAVEN AVE DALY CITY CA 94015 Limited supply 148 Model Aviation faster Jim Clem coined appropriate phrasethe model becomes lead sled has push prop