S SEP 1996 just got back g St kicks not-so-young life Pu ng Indoor Electric Free Flight model i o girders Santa Ana Cal ornia b p hangar watching fly ten minutes hoped cou nail own first tenminute flight came up twelve seconds short best effort AIKU Charles Lindley J Chronology Southern California groups experiments new Indoor class hadnt hangar since 1963 Nationals must have grown last 30 years couldnt have big last time saw Its 158 feet high center rafters mile long knew Indoor Electric IE-30 Id flying under 26-foot ceiling needed lot height So Ken Johnson offered get Santa Ana could find out what Indoor Electrics could grabbed opportunity looking up began doubt really needed room Id probably look little silly trying least Id find out what all-out Electric Indoor Duration model could Tony Naccarato have bull sessions about what times could made under experimental IE-30 rules two 50 mAb Ni-Cd batteries 30-inch span six-inch chord limit 50% stab IE-30 contestants models Author second left Tony Naccarato center Ken Johnson right 36 Model Aviation flF knows what could get lithium batteries rechargeable $8 battery flight doesnt seem like sport flying Early game Tony guessing could least 12 minutes thought maybe like eight Bill Young built tested over couple years weve homing ten minutes Sky Scraper third design built first two unbraced wings last monofilament-braced covered Ultrafilm looked little like grossly overweight microfilm model quickly learned design problem very different rubber power basic power plant two batteries Kenway motor weighs about 14 grams /2 ounce located couple smaller motors just before meet couldnt get same power motor runs out However build airplane will weigh about 18-22 grams Kenway about 3-4 grams less smaller motors Either way typical Indoor model weight happen like large lifting stab leads Center Gravity CU near trailing edge wing practically weight motor batteries motor leading edge batteries will have far behind wing balance long wires wasting power went high-thrustline pusher proved blessing because hand carve props hate think would have broken little practice gym prop out front put whole power plant removable power stick could try different motor propeller combinations shift CU easily clear start game would power plant cant gain much duration building very light youre stuck 1/2 ounce motor batteries little motor likes turn about 15000 rpm slower gets very inefficient wasting 90% battery can get such high speeds small prop wastes energy prop losses energy goes off fast little slipstream making little thrust airplane So compromise prop approximately two inches diameter Its much different rubber power larger prop always better doesnt turn model Next ran head-on another problem rubber-powered model will climb rapidly first cruise awhile before starting down Electrics have almost no initial power burst batteries fall off power first few seconds run hold almost constant power until just before end adjust model climb slowly just keeps climbing slowly until finds ceiling Reduce power little sinks very slowly floor start prop climbs well reduce power gradually reducing propeller diameter smaller prop turns faster increases back EMF motor draws less current runs longer Murphys Law says always cut off little too much wont climb have carve new prop 7 32577 575 I-005 leader 1y7 3t1p 000 3 ty 5 2 - Pick bumper height 5 I21 Motor assembly 1/16X1/4 stick Kenway motor 250 Mah NiCads 2 0/1 2 P carved spruce prop Attach thin type doublesided sticky tape Covering Ultrafilm Motor assy 14 gins Total 19 gins spars 3/32sq taper fuse 1/4X1/8 rest 1/16 sq January1998 37 SKY SCRAPER III Charles Lincitey Sept 20 1996 Authors Sky Scraper features large lifting stab high thrustline pusher thrust arrangement CG near wing TE Power sticks easily changed testing different motorlpropeller combinations Geared Kenway left Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts \ Kit #203 Over 50 Laser Cut Parts Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAl Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstsrnetcom Ive carved about 15 small props starting three inches diameter working down about 16 inches paddle blades narrow blades double single blades some pine some balsa hardened Cyanoacrylate CyA soak Some blades undercambered some flatbottomed pitch ranges 125 175 inches Thin wide blades undercamber seem work best Theoretically single-blader should have advantage havent found yet blimp hangar flew power stick smaller motor first taken airplane low ceiling meet about two minutes flight test stand gave about six-minute motor run high could climb short hop charge check adjustments off started up nice climbing circle about 25 feet diameter three minutes about 100 feet drifting over side under catwalk roughly 120 feet up no sign climb slowing panicked asked Ken whether could steer out trouble Before could get balloons reeled up right altitude position model drifted little toward center missed catwalk hit rafters about 20 feet center dome maybe 150 feet up Fortunately ceiling bumper added low ceilings worked like charm bumped stalled lost about twenty feet started back up now balloons under semi-control started back catwalk managed cut off losing another twenty feet next minute two spent time tripping up steering line kill climb short ceiling Finally stopped climbing able sit down relax cruised very briefly started long glide down landed dead-stick 830 tried about five flights using same motor slightly smaller props last 16 inches diameter smaller prop stopped just under rafters made try catwalk stopped better steering flights between 810 825 little flying time left decided see model would extra weight larger Kenway motor thrust stand ran longer thrust smaller motor wouldnt climb smallest prop went back up two inches diameter low evening sun reduced drift problems got series excellent runs high dome last flight day looked like ten minutes last sank pretty fast after motor stopped ended up 948 October 6 1996 flew same airplane carved four props retouched several older ones Ken bewildering array new airplanes larger span smaller span higher aspect ratios dihedral rolled-tube fuselages enclosed batteries dont favor batteries need cooling flier needs access check temperature charging equal voltage bad batteryas Ken hadis suspected time both did well Kens turn batter rafters broke airplane turned 800 another tried new props ended up same prop motor last time better adjustments little thinning prop blades topped ten minutes several times ended up max 1043 October 20 1996 Still flying Sky Scraper III Rather trying wring another minute two out same setup today try major leap forward Ken got hold couple gelled Kenway motors simple 41 gear ratio allows electric motor run about 15000 rpm efficient prop shaft turns four-inch-diameter prop about 4000 rpm allowing greater propeller efficiency paper should give around 50% duration power chewed up gear losses much theory happy have static test stand pretest power stick/propeller combinations home tried 39-inchdiameter plastic prop got nearly 10 minutes power run about seven grams thrust takes five-to-six grams fly model trimmed prop diameter 37 inches preflight test practice gym still showed too much climb flew first about ge check climb rafter collisions wise move because model climbed much too fast After trimming prop diameter two times got 1300 first full charge serious danger rafters next try got 1306 high day power ran out about 1030 110 feet altitude think should get another minute shaving propeller another 1/16 1/ diameter possibly cutting blade width just trifle Im convinced 15 minutes cards Ill put fairing around motor gears reduce drag removable power stick static-test stand will remain part game Lighter construction will pay off eventually also learn about max battery charging technique les Lindley 18900 Pasadero Dr Tarzana CA 91356 38 Model Aviation
Edition: Model Aviation - 1998/01
Page Numbers: 36, 37, 38
S SEP 1996 just got back g St kicks not-so-young life Pu ng Indoor Electric Free Flight model i o girders Santa Ana Cal ornia b p hangar watching fly ten minutes hoped cou nail own first tenminute flight came up twelve seconds short best effort AIKU Charles Lindley J Chronology Southern California groups experiments new Indoor class hadnt hangar since 1963 Nationals must have grown last 30 years couldnt have big last time saw Its 158 feet high center rafters mile long knew Indoor Electric IE-30 Id flying under 26-foot ceiling needed lot height So Ken Johnson offered get Santa Ana could find out what Indoor Electrics could grabbed opportunity looking up began doubt really needed room Id probably look little silly trying least Id find out what all-out Electric Indoor Duration model could Tony Naccarato have bull sessions about what times could made under experimental IE-30 rules two 50 mAb Ni-Cd batteries 30-inch span six-inch chord limit 50% stab IE-30 contestants models Author second left Tony Naccarato center Ken Johnson right 36 Model Aviation flF knows what could get lithium batteries rechargeable $8 battery flight doesnt seem like sport flying Early game Tony guessing could least 12 minutes thought maybe like eight Bill Young built tested over couple years weve homing ten minutes Sky Scraper third design built first two unbraced wings last monofilament-braced covered Ultrafilm looked little like grossly overweight microfilm model quickly learned design problem very different rubber power basic power plant two batteries Kenway motor weighs about 14 grams /2 ounce located couple smaller motors just before meet couldnt get same power motor runs out However build airplane will weigh about 18-22 grams Kenway about 3-4 grams less smaller motors Either way typical Indoor model weight happen like large lifting stab leads Center Gravity CU near trailing edge wing practically weight motor batteries motor leading edge batteries will have far behind wing balance long wires wasting power went high-thrustline pusher proved blessing because hand carve props hate think would have broken little practice gym prop out front put whole power plant removable power stick could try different motor propeller combinations shift CU easily clear start game would power plant cant gain much duration building very light youre stuck 1/2 ounce motor batteries little motor likes turn about 15000 rpm slower gets very inefficient wasting 90% battery can get such high speeds small prop wastes energy prop losses energy goes off fast little slipstream making little thrust airplane So compromise prop approximately two inches diameter Its much different rubber power larger prop always better doesnt turn model Next ran head-on another problem rubber-powered model will climb rapidly first cruise awhile before starting down Electrics have almost no initial power burst batteries fall off power first few seconds run hold almost constant power until just before end adjust model climb slowly just keeps climbing slowly until finds ceiling Reduce power little sinks very slowly floor start prop climbs well reduce power gradually reducing propeller diameter smaller prop turns faster increases back EMF motor draws less current runs longer Murphys Law says always cut off little too much wont climb have carve new prop 7 32577 575 I-005 leader 1y7 3t1p 000 3 ty 5 2 - Pick bumper height 5 I21 Motor assembly 1/16X1/4 stick Kenway motor 250 Mah NiCads 2 0/1 2 P carved spruce prop Attach thin type doublesided sticky tape Covering Ultrafilm Motor assy 14 gins Total 19 gins spars 3/32sq taper fuse 1/4X1/8 rest 1/16 sq January1998 37 SKY SCRAPER III Charles Lincitey Sept 20 1996 Authors Sky Scraper features large lifting stab high thrustline pusher thrust arrangement CG near wing TE Power sticks easily changed testing different motorlpropeller combinations Geared Kenway left Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts \ Kit #203 Over 50 Laser Cut Parts Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAl Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstsrnetcom Ive carved about 15 small props starting three inches diameter working down about 16 inches paddle blades narrow blades double single blades some pine some balsa hardened Cyanoacrylate CyA soak Some blades undercambered some flatbottomed pitch ranges 125 175 inches Thin wide blades undercamber seem work best Theoretically single-blader should have advantage havent found yet blimp hangar flew power stick smaller motor first taken airplane low ceiling meet about two minutes flight test stand gave about six-minute motor run high could climb short hop charge check adjustments off started up nice climbing circle about 25 feet diameter three minutes about 100 feet drifting over side under catwalk roughly 120 feet up no sign climb slowing panicked asked Ken whether could steer out trouble Before could get balloons reeled up right altitude position model drifted little toward center missed catwalk hit rafters about 20 feet center dome maybe 150 feet up Fortunately ceiling bumper added low ceilings worked like charm bumped stalled lost about twenty feet started back up now balloons under semi-control started back catwalk managed cut off losing another twenty feet next minute two spent time tripping up steering line kill climb short ceiling Finally stopped climbing able sit down relax cruised very briefly started long glide down landed dead-stick 830 tried about five flights using same motor slightly smaller props last 16 inches diameter smaller prop stopped just under rafters made try catwalk stopped better steering flights between 810 825 little flying time left decided see model would extra weight larger Kenway motor thrust stand ran longer thrust smaller motor wouldnt climb smallest prop went back up two inches diameter low evening sun reduced drift problems got series excellent runs high dome last flight day looked like ten minutes last sank pretty fast after motor stopped ended up 948 October 6 1996 flew same airplane carved four props retouched several older ones Ken bewildering array new airplanes larger span smaller span higher aspect ratios dihedral rolled-tube fuselages enclosed batteries dont favor batteries need cooling flier needs access check temperature charging equal voltage bad batteryas Ken hadis suspected time both did well Kens turn batter rafters broke airplane turned 800 another tried new props ended up same prop motor last time better adjustments little thinning prop blades topped ten minutes several times ended up max 1043 October 20 1996 Still flying Sky Scraper III Rather trying wring another minute two out same setup today try major leap forward Ken got hold couple gelled Kenway motors simple 41 gear ratio allows electric motor run about 15000 rpm efficient prop shaft turns four-inch-diameter prop about 4000 rpm allowing greater propeller efficiency paper should give around 50% duration power chewed up gear losses much theory happy have static test stand pretest power stick/propeller combinations home tried 39-inchdiameter plastic prop got nearly 10 minutes power run about seven grams thrust takes five-to-six grams fly model trimmed prop diameter 37 inches preflight test practice gym still showed too much climb flew first about ge check climb rafter collisions wise move because model climbed much too fast After trimming prop diameter two times got 1300 first full charge serious danger rafters next try got 1306 high day power ran out about 1030 110 feet altitude think should get another minute shaving propeller another 1/16 1/ diameter possibly cutting blade width just trifle Im convinced 15 minutes cards Ill put fairing around motor gears reduce drag removable power stick static-test stand will remain part game Lighter construction will pay off eventually also learn about max battery charging technique les Lindley 18900 Pasadero Dr Tarzana CA 91356 38 Model Aviation
Edition: Model Aviation - 1998/01
Page Numbers: 36, 37, 38
S SEP 1996 just got back g St kicks not-so-young life Pu ng Indoor Electric Free Flight model i o girders Santa Ana Cal ornia b p hangar watching fly ten minutes hoped cou nail own first tenminute flight came up twelve seconds short best effort AIKU Charles Lindley J Chronology Southern California groups experiments new Indoor class hadnt hangar since 1963 Nationals must have grown last 30 years couldnt have big last time saw Its 158 feet high center rafters mile long knew Indoor Electric IE-30 Id flying under 26-foot ceiling needed lot height So Ken Johnson offered get Santa Ana could find out what Indoor Electrics could grabbed opportunity looking up began doubt really needed room Id probably look little silly trying least Id find out what all-out Electric Indoor Duration model could Tony Naccarato have bull sessions about what times could made under experimental IE-30 rules two 50 mAb Ni-Cd batteries 30-inch span six-inch chord limit 50% stab IE-30 contestants models Author second left Tony Naccarato center Ken Johnson right 36 Model Aviation flF knows what could get lithium batteries rechargeable $8 battery flight doesnt seem like sport flying Early game Tony guessing could least 12 minutes thought maybe like eight Bill Young built tested over couple years weve homing ten minutes Sky Scraper third design built first two unbraced wings last monofilament-braced covered Ultrafilm looked little like grossly overweight microfilm model quickly learned design problem very different rubber power basic power plant two batteries Kenway motor weighs about 14 grams /2 ounce located couple smaller motors just before meet couldnt get same power motor runs out However build airplane will weigh about 18-22 grams Kenway about 3-4 grams less smaller motors Either way typical Indoor model weight happen like large lifting stab leads Center Gravity CU near trailing edge wing practically weight motor batteries motor leading edge batteries will have far behind wing balance long wires wasting power went high-thrustline pusher proved blessing because hand carve props hate think would have broken little practice gym prop out front put whole power plant removable power stick could try different motor propeller combinations shift CU easily clear start game would power plant cant gain much duration building very light youre stuck 1/2 ounce motor batteries little motor likes turn about 15000 rpm slower gets very inefficient wasting 90% battery can get such high speeds small prop wastes energy prop losses energy goes off fast little slipstream making little thrust airplane So compromise prop approximately two inches diameter Its much different rubber power larger prop always better doesnt turn model Next ran head-on another problem rubber-powered model will climb rapidly first cruise awhile before starting down Electrics have almost no initial power burst batteries fall off power first few seconds run hold almost constant power until just before end adjust model climb slowly just keeps climbing slowly until finds ceiling Reduce power little sinks very slowly floor start prop climbs well reduce power gradually reducing propeller diameter smaller prop turns faster increases back EMF motor draws less current runs longer Murphys Law says always cut off little too much wont climb have carve new prop 7 32577 575 I-005 leader 1y7 3t1p 000 3 ty 5 2 - Pick bumper height 5 I21 Motor assembly 1/16X1/4 stick Kenway motor 250 Mah NiCads 2 0/1 2 P carved spruce prop Attach thin type doublesided sticky tape Covering Ultrafilm Motor assy 14 gins Total 19 gins spars 3/32sq taper fuse 1/4X1/8 rest 1/16 sq January1998 37 SKY SCRAPER III Charles Lincitey Sept 20 1996 Authors Sky Scraper features large lifting stab high thrustline pusher thrust arrangement CG near wing TE Power sticks easily changed testing different motorlpropeller combinations Geared Kenway left Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts \ Kit #203 Over 50 Laser Cut Parts Kit #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAl Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAIL dumas@azstsrnetcom Ive carved about 15 small props starting three inches diameter working down about 16 inches paddle blades narrow blades double single blades some pine some balsa hardened Cyanoacrylate CyA soak Some blades undercambered some flatbottomed pitch ranges 125 175 inches Thin wide blades undercamber seem work best Theoretically single-blader should have advantage havent found yet blimp hangar flew power stick smaller motor first taken airplane low ceiling meet about two minutes flight test stand gave about six-minute motor run high could climb short hop charge check adjustments off started up nice climbing circle about 25 feet diameter three minutes about 100 feet drifting over side under catwalk roughly 120 feet up no sign climb slowing panicked asked Ken whether could steer out trouble Before could get balloons reeled up right altitude position model drifted little toward center missed catwalk hit rafters about 20 feet center dome maybe 150 feet up Fortunately ceiling bumper added low ceilings worked like charm bumped stalled lost about twenty feet started back up now balloons under semi-control started back catwalk managed cut off losing another twenty feet next minute two spent time tripping up steering line kill climb short ceiling Finally stopped climbing able sit down relax cruised very briefly started long glide down landed dead-stick 830 tried about five flights using same motor slightly smaller props last 16 inches diameter smaller prop stopped just under rafters made try catwalk stopped better steering flights between 810 825 little flying time left decided see model would extra weight larger Kenway motor thrust stand ran longer thrust smaller motor wouldnt climb smallest prop went back up two inches diameter low evening sun reduced drift problems got series excellent runs high dome last flight day looked like ten minutes last sank pretty fast after motor stopped ended up 948 October 6 1996 flew same airplane carved four props retouched several older ones Ken bewildering array new airplanes larger span smaller span higher aspect ratios dihedral rolled-tube fuselages enclosed batteries dont favor batteries need cooling flier needs access check temperature charging equal voltage bad batteryas Ken hadis suspected time both did well Kens turn batter rafters broke airplane turned 800 another tried new props ended up same prop motor last time better adjustments little thinning prop blades topped ten minutes several times ended up max 1043 October 20 1996 Still flying Sky Scraper III Rather trying wring another minute two out same setup today try major leap forward Ken got hold couple gelled Kenway motors simple 41 gear ratio allows electric motor run about 15000 rpm efficient prop shaft turns four-inch-diameter prop about 4000 rpm allowing greater propeller efficiency paper should give around 50% duration power chewed up gear losses much theory happy have static test stand pretest power stick/propeller combinations home tried 39-inchdiameter plastic prop got nearly 10 minutes power run about seven grams thrust takes five-to-six grams fly model trimmed prop diameter 37 inches preflight test practice gym still showed too much climb flew first about ge check climb rafter collisions wise move because model climbed much too fast After trimming prop diameter two times got 1300 first full charge serious danger rafters next try got 1306 high day power ran out about 1030 110 feet altitude think should get another minute shaving propeller another 1/16 1/ diameter possibly cutting blade width just trifle Im convinced 15 minutes cards Ill put fairing around motor gears reduce drag removable power stick static-test stand will remain part game Lighter construction will pay off eventually also learn about max battery charging technique les Lindley 18900 Pasadero Dr Tarzana CA 91356 38 Model Aviation