LOOKING BACK over years have asked yourself airplanes en joyed have strangely enough contest winners seem play second fiddle few what call play airplanes tended win anything yet ease flight versatility gave much enjoy ment So decided design new play airplane What form should take result Sportster fine Sunday flier sure versatile air plane much added potential designing around popular 40 en gines have multi-purpose design can used variety purposes sides Sunday fun newcomer should happy general flying yet does have potential competitive several events least local level Sportster scaled Stardust Formula racer makes eligible entry Stand-Off Scale com petition As designed RC has good aerodynamic features allow respec table pattern performance desired considering requirement AMA Open Pylon racing design sized meet rules ofthat event too detracting anything else Since its daddy Stardust attention details created design also capable getting course Formula races An attractive Sunday Flier play airplane serious competitor offers capabilities package rare ly seen single aircraft designer full-scale Stardust John Scoville former modeler author spent enjoyable afternoon control-line days Johns modeling experience shows up strongly full-scale racer As model clean Plans offar choice airfoils 15%pro viding lift maneuvers meeting Open Pylon rules 9%which meets Formula 1 requirements Taken NACA 6600 series shara common bottom curvature both fit same fuselage cut-Out either case design Sport Scale pretty yet simple airplane Only modeler seems know obtain desirable combination John instigator full-scale Form movement Rochester NY area early 50s racers came out movement consistent winning Shoestring John got started racing helping build Paul Schroeders Rarebird Dragontail pusher Later built several own designs noteable being Stardust Unfortunate ly Johns flying career came abrupt end flew Formula ground inverted race Niagara Falls Fortunately John recovered still very interested aviation today Sportsters assets fundamental including takes make DGA damn-good-airplane Ben Howard 14 Model Aviation Pappy calls fun airplane Actually Stand-Off Scoville Stardust can fuel tank easy service through hatch fuselage top Cheek cowls add strength nose section keyhole cowl combines appearance fully cowled engine utility open engine Problems cowl fitting usual fasteners eliminated would have said sure pretty Sunday airplane should scaleish todays know-how fine equipment just easy go route otherthe ef fort really no greater Sound basic aero dynamics have used Sco villes help no chore either force set-up taken directly pattern racing experience makes very docile flying airplane airfoils used well-proven NACA 6500 series excellent modeling Sportster has some interesting fea tures both construction utility keyhole cowl concept gives appearance fully cowled engine utility open engine does require fitting fasteners associated nor mal cowlings though simple fire wall-mounted metal engine mount used above-normal durability has attained use plywood box fuse lage front necessary cowlings add rigidity structure box also serves fuel tank compartment easi ly accessible removeable hatch ing shoulder-wing design wing removed opens up larger normal RC compartment Accessibility strong point pattern scale flying using sport-type engine Sportster has ingredients good maneuverability high-lift wing has enough area provide wing loading bit less aver age Stability excellent response quick As far power loading con cerned Sportster takes advantage excellent output provided todays breed sport 40 engines engines nearly match average 60 power well handling light weight model no question about simple box fuselage disguised clean pretty lines Sportster versatile flying rather like owning sports car design er does claim world-beater par ticular competitive event can add new dimensions flying maneuverability design clean helps maneuvers can also give speed power added So racing pos sibility Open Pylon interesting class newcomers simply because compe tition usually flooded ex pert racing people Most time can well sport-type engine course no rule saying switch racing engine allowed change simple matter Sportster mula course elite class racing no can expect big winner such simple model Sportster However will get racing airplane can feel home can big asset little luck some consistency knows race will end up Construction does seem necessary go step-by-step description such simple model some hints suggestions will help September1977 15 flown sport used Open Pylon Formula trainer 40-sized engines Ample room everything Loosening two fasteners gives immediate access equipment thanks shoulder wing Wing assembled piece inverted dihedral board fuselage basic box two one-piece sheet sides bent around simple bulkhead Two plywood doublers used front get strength en gine mount bulkheads make un necessary additional reinforcing landing gear mount wing fastener aluminum engine mount takes vari ety engines key key hole cowl Once mount has fas tened firewall cowl simply slipped over cemented place No need fitting around engine desired roxinded effect obtained shallow curved formers top bot tom over sheeting easily bent beveled longerons corner ample material nicely round corners wheels wheel pants fas tened aluminum gear single 10-32 bolt piece thick-wall tubing nut wheel hub drilled out piece 1/4 tubing cut about 1/64 longer hub thick tube acts axle wheel hub assemble tube put hub wheel slipped pant bolt inserted through tube out inner side pant wheel pant tightened securely onto land ing gear nut inside gear locks everything place gear also held landing gear block 10-32 bolts Simply drill tap gear block screw place wing planform parallel edged taper ribs basically alike can cut out together block same template full-depth spar strong about simple can using seven wing jigs shown wing can assembled completely dihedral board inverted position Two airfoils shown 15% thick meets Open Pylon rules yet gives plenty lift maneuvering considered standard model 9% section also shown meets mini mum Formula speed de sired airfoil well proven Form two airfoils unique both have same bottom curve Both wings can fitted same fuse lage racing other sport flying simple wings cut foam desired However would hesitate use foam thick prototype wing quickly assembled weighed 8 oz ready covering doubt foam cores alone would light like tedious work involved excellent finish evolved meth od provides good durable finish backbreaking work Since results good base start structure must sanded smoothed perfection Next wing covered Silron similar fabric doped type fabric very light yet strong ward portion fuselage covered 3A-oz glass cloth polyester resin fiberglass resin Polyester resin really hot-fuel proof glass cloth adds durability needed remainder model cov ered medium-weight Silkspan paper goes easily dope light immediately seals grain seams etc smoothed off 400 paper entire model given heavy coat Aero Gloss clear dope dry given 400-paper treatment Amazingly enough model now ready filler coat use K&B Super Poxy filler heavy coat applied sanded out Color added desired least two coats required because first will have sanded lightly finish filling process judi cious choice color schemes masking job can completed two coats three decals etc used final coat clear will seal things nicely As far paint brands concerned use both Super Poxy Hob bypoxy seem get along better Hobbypoxy use whichever prefer Flying equipment elementary Most 8 oz fuel tank will fit tank com partment sport type flying front-rotor engines wide blade 10-6 prop well suited racing can experi ment Several different ones will probably best have used 9-7 Rev-Up series 200 really looks like stunt prop gives excellent speed wish try tooth pick styles choose 8-9 diameter 7 pitch racing engines im portant get rpm up engine develops its horsepower cri terion choosing size story has teased assem bling Sportster am sure will get much enjoyment no matter what use 16 Model Aviation Engine bolted metal mount Engine mount removes through opening behind spinner Exhaust cooling duct provides means mount 40 whether side rear exhaust pretty airplane can simple unusual configuration fullscale aircraft ideally suited modeling practice Stardusts designer active modeler iiiiIIiiiiIi ii ii ii GRIR GM4 NIRNit ii--iLiiIi J1— It- 11 __ I-SEXRi/I I$ XHI/I _SBIB 14$ HIRVI ii II ii _-4b ii3J.RJEiEP/I 4 YSIVR 0110$ HJIM 10 TILl -iiI Ii IH iF5 E4NIYOPI iiii 0A113R flolyPIli---- B -R/ERHt~Ii__SNOBSirY 4 X BI/K31 ]Nid' DIHEDRAL IS/lB H Li Ni VS1VRZE/E NM S3ildS VidRI/r IN 314145 4-DOUBLER 7[7I MOUNT I302U 5-TANABEN-I UI LS I/4PLY GEAR MOIINT SOLDBA SACHEEKEOW S FUEi fJjI/B PORE SKEA I/A lORE SBCIL NOTOMOURT P HENUIQUR SKOLTEG B TIIRUERONCOOIJNIt EXHAUST TORNEL SECBBsECEC B EGELTANAHATCH 3/R5HC Oi/B DOOBLERJ RvPDEaQ -DO EPISINE3 SERVOTR AT MOUNTS PA - CAMLOC MOUNT j I/B 11i RBBA I/8 BALSA3/W RAILS I/BPLY-SEE 0-0 SIC IrCANOPY 1/4 SPINNER BO VIJEL TANKi-li-. /DIBLER -i-0-------— i AILERQN SERVO IISERVOBAILS WILLIAMS WHEEL PARTS-4AND ZS/4WHEEIOS SOt 0 j ___ __ I ALL HINGES PLASTIC STRIP TOOTH PICKS /4 BALSA is--I 1~ I~----—II- I/B PLY NUN OPQLGNORMITRAINER JOHN SCOVILLES LBBPId.4L WING SPANS4- WINO AREA 500 SO IN POWERiANY 4DEHO SPORTOR RACING MODEL DESIGN BY 0NoBiM Il/PR O125 45H ii $14111 /E r P
Edition: Model Aviation - 1977/09
Page Numbers: 14, 15, 16, 17
LOOKING BACK over years have asked yourself airplanes en joyed have strangely enough contest winners seem play second fiddle few what call play airplanes tended win anything yet ease flight versatility gave much enjoy ment So decided design new play airplane What form should take result Sportster fine Sunday flier sure versatile air plane much added potential designing around popular 40 en gines have multi-purpose design can used variety purposes sides Sunday fun newcomer should happy general flying yet does have potential competitive several events least local level Sportster scaled Stardust Formula racer makes eligible entry Stand-Off Scale com petition As designed RC has good aerodynamic features allow respec table pattern performance desired considering requirement AMA Open Pylon racing design sized meet rules ofthat event too detracting anything else Since its daddy Stardust attention details created design also capable getting course Formula races An attractive Sunday Flier play airplane serious competitor offers capabilities package rare ly seen single aircraft designer full-scale Stardust John Scoville former modeler author spent enjoyable afternoon control-line days Johns modeling experience shows up strongly full-scale racer As model clean Plans offar choice airfoils 15%pro viding lift maneuvers meeting Open Pylon rules 9%which meets Formula 1 requirements Taken NACA 6600 series shara common bottom curvature both fit same fuselage cut-Out either case design Sport Scale pretty yet simple airplane Only modeler seems know obtain desirable combination John instigator full-scale Form movement Rochester NY area early 50s racers came out movement consistent winning Shoestring John got started racing helping build Paul Schroeders Rarebird Dragontail pusher Later built several own designs noteable being Stardust Unfortunate ly Johns flying career came abrupt end flew Formula ground inverted race Niagara Falls Fortunately John recovered still very interested aviation today Sportsters assets fundamental including takes make DGA damn-good-airplane Ben Howard 14 Model Aviation Pappy calls fun airplane Actually Stand-Off Scoville Stardust can fuel tank easy service through hatch fuselage top Cheek cowls add strength nose section keyhole cowl combines appearance fully cowled engine utility open engine Problems cowl fitting usual fasteners eliminated would have said sure pretty Sunday airplane should scaleish todays know-how fine equipment just easy go route otherthe ef fort really no greater Sound basic aero dynamics have used Sco villes help no chore either force set-up taken directly pattern racing experience makes very docile flying airplane airfoils used well-proven NACA 6500 series excellent modeling Sportster has some interesting fea tures both construction utility keyhole cowl concept gives appearance fully cowled engine utility open engine does require fitting fasteners associated nor mal cowlings though simple fire wall-mounted metal engine mount used above-normal durability has attained use plywood box fuse lage front necessary cowlings add rigidity structure box also serves fuel tank compartment easi ly accessible removeable hatch ing shoulder-wing design wing removed opens up larger normal RC compartment Accessibility strong point pattern scale flying using sport-type engine Sportster has ingredients good maneuverability high-lift wing has enough area provide wing loading bit less aver age Stability excellent response quick As far power loading con cerned Sportster takes advantage excellent output provided todays breed sport 40 engines engines nearly match average 60 power well handling light weight model no question about simple box fuselage disguised clean pretty lines Sportster versatile flying rather like owning sports car design er does claim world-beater par ticular competitive event can add new dimensions flying maneuverability design clean helps maneuvers can also give speed power added So racing pos sibility Open Pylon interesting class newcomers simply because compe tition usually flooded ex pert racing people Most time can well sport-type engine course no rule saying switch racing engine allowed change simple matter Sportster mula course elite class racing no can expect big winner such simple model Sportster However will get racing airplane can feel home can big asset little luck some consistency knows race will end up Construction does seem necessary go step-by-step description such simple model some hints suggestions will help September1977 15 flown sport used Open Pylon Formula trainer 40-sized engines Ample room everything Loosening two fasteners gives immediate access equipment thanks shoulder wing Wing assembled piece inverted dihedral board fuselage basic box two one-piece sheet sides bent around simple bulkhead Two plywood doublers used front get strength en gine mount bulkheads make un necessary additional reinforcing landing gear mount wing fastener aluminum engine mount takes vari ety engines key key hole cowl Once mount has fas tened firewall cowl simply slipped over cemented place No need fitting around engine desired roxinded effect obtained shallow curved formers top bot tom over sheeting easily bent beveled longerons corner ample material nicely round corners wheels wheel pants fas tened aluminum gear single 10-32 bolt piece thick-wall tubing nut wheel hub drilled out piece 1/4 tubing cut about 1/64 longer hub thick tube acts axle wheel hub assemble tube put hub wheel slipped pant bolt inserted through tube out inner side pant wheel pant tightened securely onto land ing gear nut inside gear locks everything place gear also held landing gear block 10-32 bolts Simply drill tap gear block screw place wing planform parallel edged taper ribs basically alike can cut out together block same template full-depth spar strong about simple can using seven wing jigs shown wing can assembled completely dihedral board inverted position Two airfoils shown 15% thick meets Open Pylon rules yet gives plenty lift maneuvering considered standard model 9% section also shown meets mini mum Formula speed de sired airfoil well proven Form two airfoils unique both have same bottom curve Both wings can fitted same fuse lage racing other sport flying simple wings cut foam desired However would hesitate use foam thick prototype wing quickly assembled weighed 8 oz ready covering doubt foam cores alone would light like tedious work involved excellent finish evolved meth od provides good durable finish backbreaking work Since results good base start structure must sanded smoothed perfection Next wing covered Silron similar fabric doped type fabric very light yet strong ward portion fuselage covered 3A-oz glass cloth polyester resin fiberglass resin Polyester resin really hot-fuel proof glass cloth adds durability needed remainder model cov ered medium-weight Silkspan paper goes easily dope light immediately seals grain seams etc smoothed off 400 paper entire model given heavy coat Aero Gloss clear dope dry given 400-paper treatment Amazingly enough model now ready filler coat use K&B Super Poxy filler heavy coat applied sanded out Color added desired least two coats required because first will have sanded lightly finish filling process judi cious choice color schemes masking job can completed two coats three decals etc used final coat clear will seal things nicely As far paint brands concerned use both Super Poxy Hob bypoxy seem get along better Hobbypoxy use whichever prefer Flying equipment elementary Most 8 oz fuel tank will fit tank com partment sport type flying front-rotor engines wide blade 10-6 prop well suited racing can experi ment Several different ones will probably best have used 9-7 Rev-Up series 200 really looks like stunt prop gives excellent speed wish try tooth pick styles choose 8-9 diameter 7 pitch racing engines im portant get rpm up engine develops its horsepower cri terion choosing size story has teased assem bling Sportster am sure will get much enjoyment no matter what use 16 Model Aviation Engine bolted metal mount Engine mount removes through opening behind spinner Exhaust cooling duct provides means mount 40 whether side rear exhaust pretty airplane can simple unusual configuration fullscale aircraft ideally suited modeling practice Stardusts designer active modeler iiiiIIiiiiIi ii ii ii GRIR GM4 NIRNit ii--iLiiIi J1— It- 11 __ I-SEXRi/I I$ XHI/I _SBIB 14$ HIRVI ii II ii _-4b ii3J.RJEiEP/I 4 YSIVR 0110$ HJIM 10 TILl -iiI Ii IH iF5 E4NIYOPI iiii 0A113R flolyPIli---- B -R/ERHt~Ii__SNOBSirY 4 X BI/K31 ]Nid' DIHEDRAL IS/lB H Li Ni VS1VRZE/E NM S3ildS VidRI/r IN 314145 4-DOUBLER 7[7I MOUNT I302U 5-TANABEN-I UI LS I/4PLY GEAR MOIINT SOLDBA SACHEEKEOW S FUEi fJjI/B PORE SKEA I/A lORE SBCIL NOTOMOURT P HENUIQUR SKOLTEG B TIIRUERONCOOIJNIt EXHAUST TORNEL SECBBsECEC B EGELTANAHATCH 3/R5HC Oi/B DOOBLERJ RvPDEaQ -DO EPISINE3 SERVOTR AT MOUNTS PA - CAMLOC MOUNT j I/B 11i RBBA I/8 BALSA3/W RAILS I/BPLY-SEE 0-0 SIC IrCANOPY 1/4 SPINNER BO VIJEL TANKi-li-. /DIBLER -i-0-------— i AILERQN SERVO IISERVOBAILS WILLIAMS WHEEL PARTS-4AND ZS/4WHEEIOS SOt 0 j ___ __ I ALL HINGES PLASTIC STRIP TOOTH PICKS /4 BALSA is--I 1~ I~----—II- I/B PLY NUN OPQLGNORMITRAINER JOHN SCOVILLES LBBPId.4L WING SPANS4- WINO AREA 500 SO IN POWERiANY 4DEHO SPORTOR RACING MODEL DESIGN BY 0NoBiM Il/PR O125 45H ii $14111 /E r P
Edition: Model Aviation - 1977/09
Page Numbers: 14, 15, 16, 17
LOOKING BACK over years have asked yourself airplanes en joyed have strangely enough contest winners seem play second fiddle few what call play airplanes tended win anything yet ease flight versatility gave much enjoy ment So decided design new play airplane What form should take result Sportster fine Sunday flier sure versatile air plane much added potential designing around popular 40 en gines have multi-purpose design can used variety purposes sides Sunday fun newcomer should happy general flying yet does have potential competitive several events least local level Sportster scaled Stardust Formula racer makes eligible entry Stand-Off Scale com petition As designed RC has good aerodynamic features allow respec table pattern performance desired considering requirement AMA Open Pylon racing design sized meet rules ofthat event too detracting anything else Since its daddy Stardust attention details created design also capable getting course Formula races An attractive Sunday Flier play airplane serious competitor offers capabilities package rare ly seen single aircraft designer full-scale Stardust John Scoville former modeler author spent enjoyable afternoon control-line days Johns modeling experience shows up strongly full-scale racer As model clean Plans offar choice airfoils 15%pro viding lift maneuvers meeting Open Pylon rules 9%which meets Formula 1 requirements Taken NACA 6600 series shara common bottom curvature both fit same fuselage cut-Out either case design Sport Scale pretty yet simple airplane Only modeler seems know obtain desirable combination John instigator full-scale Form movement Rochester NY area early 50s racers came out movement consistent winning Shoestring John got started racing helping build Paul Schroeders Rarebird Dragontail pusher Later built several own designs noteable being Stardust Unfortunate ly Johns flying career came abrupt end flew Formula ground inverted race Niagara Falls Fortunately John recovered still very interested aviation today Sportsters assets fundamental including takes make DGA damn-good-airplane Ben Howard 14 Model Aviation Pappy calls fun airplane Actually Stand-Off Scoville Stardust can fuel tank easy service through hatch fuselage top Cheek cowls add strength nose section keyhole cowl combines appearance fully cowled engine utility open engine Problems cowl fitting usual fasteners eliminated would have said sure pretty Sunday airplane should scaleish todays know-how fine equipment just easy go route otherthe ef fort really no greater Sound basic aero dynamics have used Sco villes help no chore either force set-up taken directly pattern racing experience makes very docile flying airplane airfoils used well-proven NACA 6500 series excellent modeling Sportster has some interesting fea tures both construction utility keyhole cowl concept gives appearance fully cowled engine utility open engine does require fitting fasteners associated nor mal cowlings though simple fire wall-mounted metal engine mount used above-normal durability has attained use plywood box fuse lage front necessary cowlings add rigidity structure box also serves fuel tank compartment easi ly accessible removeable hatch ing shoulder-wing design wing removed opens up larger normal RC compartment Accessibility strong point pattern scale flying using sport-type engine Sportster has ingredients good maneuverability high-lift wing has enough area provide wing loading bit less aver age Stability excellent response quick As far power loading con cerned Sportster takes advantage excellent output provided todays breed sport 40 engines engines nearly match average 60 power well handling light weight model no question about simple box fuselage disguised clean pretty lines Sportster versatile flying rather like owning sports car design er does claim world-beater par ticular competitive event can add new dimensions flying maneuverability design clean helps maneuvers can also give speed power added So racing pos sibility Open Pylon interesting class newcomers simply because compe tition usually flooded ex pert racing people Most time can well sport-type engine course no rule saying switch racing engine allowed change simple matter Sportster mula course elite class racing no can expect big winner such simple model Sportster However will get racing airplane can feel home can big asset little luck some consistency knows race will end up Construction does seem necessary go step-by-step description such simple model some hints suggestions will help September1977 15 flown sport used Open Pylon Formula trainer 40-sized engines Ample room everything Loosening two fasteners gives immediate access equipment thanks shoulder wing Wing assembled piece inverted dihedral board fuselage basic box two one-piece sheet sides bent around simple bulkhead Two plywood doublers used front get strength en gine mount bulkheads make un necessary additional reinforcing landing gear mount wing fastener aluminum engine mount takes vari ety engines key key hole cowl Once mount has fas tened firewall cowl simply slipped over cemented place No need fitting around engine desired roxinded effect obtained shallow curved formers top bot tom over sheeting easily bent beveled longerons corner ample material nicely round corners wheels wheel pants fas tened aluminum gear single 10-32 bolt piece thick-wall tubing nut wheel hub drilled out piece 1/4 tubing cut about 1/64 longer hub thick tube acts axle wheel hub assemble tube put hub wheel slipped pant bolt inserted through tube out inner side pant wheel pant tightened securely onto land ing gear nut inside gear locks everything place gear also held landing gear block 10-32 bolts Simply drill tap gear block screw place wing planform parallel edged taper ribs basically alike can cut out together block same template full-depth spar strong about simple can using seven wing jigs shown wing can assembled completely dihedral board inverted position Two airfoils shown 15% thick meets Open Pylon rules yet gives plenty lift maneuvering considered standard model 9% section also shown meets mini mum Formula speed de sired airfoil well proven Form two airfoils unique both have same bottom curve Both wings can fitted same fuse lage racing other sport flying simple wings cut foam desired However would hesitate use foam thick prototype wing quickly assembled weighed 8 oz ready covering doubt foam cores alone would light like tedious work involved excellent finish evolved meth od provides good durable finish backbreaking work Since results good base start structure must sanded smoothed perfection Next wing covered Silron similar fabric doped type fabric very light yet strong ward portion fuselage covered 3A-oz glass cloth polyester resin fiberglass resin Polyester resin really hot-fuel proof glass cloth adds durability needed remainder model cov ered medium-weight Silkspan paper goes easily dope light immediately seals grain seams etc smoothed off 400 paper entire model given heavy coat Aero Gloss clear dope dry given 400-paper treatment Amazingly enough model now ready filler coat use K&B Super Poxy filler heavy coat applied sanded out Color added desired least two coats required because first will have sanded lightly finish filling process judi cious choice color schemes masking job can completed two coats three decals etc used final coat clear will seal things nicely As far paint brands concerned use both Super Poxy Hob bypoxy seem get along better Hobbypoxy use whichever prefer Flying equipment elementary Most 8 oz fuel tank will fit tank com partment sport type flying front-rotor engines wide blade 10-6 prop well suited racing can experi ment Several different ones will probably best have used 9-7 Rev-Up series 200 really looks like stunt prop gives excellent speed wish try tooth pick styles choose 8-9 diameter 7 pitch racing engines im portant get rpm up engine develops its horsepower cri terion choosing size story has teased assem bling Sportster am sure will get much enjoyment no matter what use 16 Model Aviation Engine bolted metal mount Engine mount removes through opening behind spinner Exhaust cooling duct provides means mount 40 whether side rear exhaust pretty airplane can simple unusual configuration fullscale aircraft ideally suited modeling practice Stardusts designer active modeler iiiiIIiiiiIi ii ii ii GRIR GM4 NIRNit ii--iLiiIi J1— It- 11 __ I-SEXRi/I I$ XHI/I _SBIB 14$ HIRVI ii II ii _-4b ii3J.RJEiEP/I 4 YSIVR 0110$ HJIM 10 TILl -iiI Ii IH iF5 E4NIYOPI iiii 0A113R flolyPIli---- B -R/ERHt~Ii__SNOBSirY 4 X BI/K31 ]Nid' DIHEDRAL IS/lB H Li Ni VS1VRZE/E NM S3ildS VidRI/r IN 314145 4-DOUBLER 7[7I MOUNT I302U 5-TANABEN-I UI LS I/4PLY GEAR MOIINT SOLDBA SACHEEKEOW S FUEi fJjI/B PORE SKEA I/A lORE SBCIL NOTOMOURT P HENUIQUR SKOLTEG B TIIRUERONCOOIJNIt EXHAUST TORNEL SECBBsECEC B EGELTANAHATCH 3/R5HC Oi/B DOOBLERJ RvPDEaQ -DO EPISINE3 SERVOTR AT MOUNTS PA - CAMLOC MOUNT j I/B 11i RBBA I/8 BALSA3/W RAILS I/BPLY-SEE 0-0 SIC IrCANOPY 1/4 SPINNER BO VIJEL TANKi-li-. /DIBLER -i-0-------— i AILERQN SERVO IISERVOBAILS WILLIAMS WHEEL PARTS-4AND ZS/4WHEEIOS SOt 0 j ___ __ I ALL HINGES PLASTIC STRIP TOOTH PICKS /4 BALSA is--I 1~ I~----—II- I/B PLY NUN OPQLGNORMITRAINER JOHN SCOVILLES LBBPId.4L WING SPANS4- WINO AREA 500 SO IN POWERiANY 4DEHO SPORTOR RACING MODEL DESIGN BY 0NoBiM Il/PR O125 45H ii $14111 /E r P
Edition: Model Aviation - 1977/09
Page Numbers: 14, 15, 16, 17
LOOKING BACK over years have asked yourself airplanes en joyed have strangely enough contest winners seem play second fiddle few what call play airplanes tended win anything yet ease flight versatility gave much enjoy ment So decided design new play airplane What form should take result Sportster fine Sunday flier sure versatile air plane much added potential designing around popular 40 en gines have multi-purpose design can used variety purposes sides Sunday fun newcomer should happy general flying yet does have potential competitive several events least local level Sportster scaled Stardust Formula racer makes eligible entry Stand-Off Scale com petition As designed RC has good aerodynamic features allow respec table pattern performance desired considering requirement AMA Open Pylon racing design sized meet rules ofthat event too detracting anything else Since its daddy Stardust attention details created design also capable getting course Formula races An attractive Sunday Flier play airplane serious competitor offers capabilities package rare ly seen single aircraft designer full-scale Stardust John Scoville former modeler author spent enjoyable afternoon control-line days Johns modeling experience shows up strongly full-scale racer As model clean Plans offar choice airfoils 15%pro viding lift maneuvers meeting Open Pylon rules 9%which meets Formula 1 requirements Taken NACA 6600 series shara common bottom curvature both fit same fuselage cut-Out either case design Sport Scale pretty yet simple airplane Only modeler seems know obtain desirable combination John instigator full-scale Form movement Rochester NY area early 50s racers came out movement consistent winning Shoestring John got started racing helping build Paul Schroeders Rarebird Dragontail pusher Later built several own designs noteable being Stardust Unfortunate ly Johns flying career came abrupt end flew Formula ground inverted race Niagara Falls Fortunately John recovered still very interested aviation today Sportsters assets fundamental including takes make DGA damn-good-airplane Ben Howard 14 Model Aviation Pappy calls fun airplane Actually Stand-Off Scoville Stardust can fuel tank easy service through hatch fuselage top Cheek cowls add strength nose section keyhole cowl combines appearance fully cowled engine utility open engine Problems cowl fitting usual fasteners eliminated would have said sure pretty Sunday airplane should scaleish todays know-how fine equipment just easy go route otherthe ef fort really no greater Sound basic aero dynamics have used Sco villes help no chore either force set-up taken directly pattern racing experience makes very docile flying airplane airfoils used well-proven NACA 6500 series excellent modeling Sportster has some interesting fea tures both construction utility keyhole cowl concept gives appearance fully cowled engine utility open engine does require fitting fasteners associated nor mal cowlings though simple fire wall-mounted metal engine mount used above-normal durability has attained use plywood box fuse lage front necessary cowlings add rigidity structure box also serves fuel tank compartment easi ly accessible removeable hatch ing shoulder-wing design wing removed opens up larger normal RC compartment Accessibility strong point pattern scale flying using sport-type engine Sportster has ingredients good maneuverability high-lift wing has enough area provide wing loading bit less aver age Stability excellent response quick As far power loading con cerned Sportster takes advantage excellent output provided todays breed sport 40 engines engines nearly match average 60 power well handling light weight model no question about simple box fuselage disguised clean pretty lines Sportster versatile flying rather like owning sports car design er does claim world-beater par ticular competitive event can add new dimensions flying maneuverability design clean helps maneuvers can also give speed power added So racing pos sibility Open Pylon interesting class newcomers simply because compe tition usually flooded ex pert racing people Most time can well sport-type engine course no rule saying switch racing engine allowed change simple matter Sportster mula course elite class racing no can expect big winner such simple model Sportster However will get racing airplane can feel home can big asset little luck some consistency knows race will end up Construction does seem necessary go step-by-step description such simple model some hints suggestions will help September1977 15 flown sport used Open Pylon Formula trainer 40-sized engines Ample room everything Loosening two fasteners gives immediate access equipment thanks shoulder wing Wing assembled piece inverted dihedral board fuselage basic box two one-piece sheet sides bent around simple bulkhead Two plywood doublers used front get strength en gine mount bulkheads make un necessary additional reinforcing landing gear mount wing fastener aluminum engine mount takes vari ety engines key key hole cowl Once mount has fas tened firewall cowl simply slipped over cemented place No need fitting around engine desired roxinded effect obtained shallow curved formers top bot tom over sheeting easily bent beveled longerons corner ample material nicely round corners wheels wheel pants fas tened aluminum gear single 10-32 bolt piece thick-wall tubing nut wheel hub drilled out piece 1/4 tubing cut about 1/64 longer hub thick tube acts axle wheel hub assemble tube put hub wheel slipped pant bolt inserted through tube out inner side pant wheel pant tightened securely onto land ing gear nut inside gear locks everything place gear also held landing gear block 10-32 bolts Simply drill tap gear block screw place wing planform parallel edged taper ribs basically alike can cut out together block same template full-depth spar strong about simple can using seven wing jigs shown wing can assembled completely dihedral board inverted position Two airfoils shown 15% thick meets Open Pylon rules yet gives plenty lift maneuvering considered standard model 9% section also shown meets mini mum Formula speed de sired airfoil well proven Form two airfoils unique both have same bottom curve Both wings can fitted same fuse lage racing other sport flying simple wings cut foam desired However would hesitate use foam thick prototype wing quickly assembled weighed 8 oz ready covering doubt foam cores alone would light like tedious work involved excellent finish evolved meth od provides good durable finish backbreaking work Since results good base start structure must sanded smoothed perfection Next wing covered Silron similar fabric doped type fabric very light yet strong ward portion fuselage covered 3A-oz glass cloth polyester resin fiberglass resin Polyester resin really hot-fuel proof glass cloth adds durability needed remainder model cov ered medium-weight Silkspan paper goes easily dope light immediately seals grain seams etc smoothed off 400 paper entire model given heavy coat Aero Gloss clear dope dry given 400-paper treatment Amazingly enough model now ready filler coat use K&B Super Poxy filler heavy coat applied sanded out Color added desired least two coats required because first will have sanded lightly finish filling process judi cious choice color schemes masking job can completed two coats three decals etc used final coat clear will seal things nicely As far paint brands concerned use both Super Poxy Hob bypoxy seem get along better Hobbypoxy use whichever prefer Flying equipment elementary Most 8 oz fuel tank will fit tank com partment sport type flying front-rotor engines wide blade 10-6 prop well suited racing can experi ment Several different ones will probably best have used 9-7 Rev-Up series 200 really looks like stunt prop gives excellent speed wish try tooth pick styles choose 8-9 diameter 7 pitch racing engines im portant get rpm up engine develops its horsepower cri terion choosing size story has teased assem 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