NO OCR TEXT GIVEN few breaks almost plane field can win contest Perhaps best fliers run scared havent getting breaks take close look Toothpicks has some unconventional features can put thick things Toothpicks conceived particular attention given Light construction high strength-to-weight ratio B Low moment inertia about axes stabil ity transition glide C Low center lateral area resist spiral dives first design experimental Class-C job designed around souped-up Fox 36 standard single by-pass engine 580 sq wing few exceptions its features eventually carried through Toothpicks wing tapered cantilever strength wide flange beam locked geodetic ribs main spar wing stab covered Silkspan followed 2-mil music wire criss-crossing top bottom surfaces resist warp flutter followed 1/2-mil Mylar overlay moistureand fuel-proofing puncture resistance truss-type fuselage used mini mize moment inertia Simply put means real weight contributing elements plane concentrated close possible center gravity light tail end keeps extremely light order balance plane engine must placed close CG yields double benefit since weight being pulled both ends allows plane flip out awkward position might engine stops thereby avoiding loss altitude recovery dive low inertia also improves glide allowing plane ride up down freely minute air waves wing also stable under rather resolutely plowing through powerwhich high priority item plane light tail end engines becoming ever powerful engine pulled up under leading edge cant think single factor im June 1979 51 Cardboard profile Toothpicks used locate center lateral area Caption says CG profile its CIAnote white dot space line CG So pylon just pylon experimen tal pylons note winglet second top Bottom pylons skewedbottommost has pylon trim tab Like mysterious fins modern jets tricky surfaces have special effects trimming control aircraft Tootflplcks great fly-oilsa situation frequently finds itself Exceptional acceleration big factor Morris has used paint overspray front one-third wing stabilizer chords turbulation Mylar coveringlike Gossamer Condor portant light tail end three axes motion through CG horizontal axis about plane pitches up down vertical axis about plane takes right left direction longitudinal axis about plane rolls left right virtues low moment inertia about horizontal axis often thought discussed above about two other axes suspect could dwarf ourselves ride planes heaven forbid would find glide nearly serene see time plane changes attitude pitch turn roll slightly uses part its lift overcome inertia virtue design moment inertia can minimized lift conserved maintain altitude guess what reduces moment inertia about longitudinal axis plane can bank freely again light wing tips help keep down moment inertia about axis So high thrust line design trade-off comes like way low-thrust ship can trimmed corkscrew under power Like spinning bullet its track predictable Also structural reasons prefer fuselage line engine hard landing engine-first impact compressive forces fuselage di rect no bending moments requiring additional reinforcement weight rudder placed below stab order lower center lateral area 1/2-mil Mylar since 1/4-mil Mylar would overpower Japanese tissue causing wrinkle underneath defeat its purpose adding rigidity Also criss-crossed 2-mil music wire omitted structure strong enough important feature added Paint over-spray sandpaper-like quality applied front one-third wing stab top sides turbulation combination gives low drag surfaces except leading edge paint texture provides turbulation am compelled plug Mylar because offers essential advantages moisture resistant can get important early morning maxes air stable dense skin loosening dampness easy moment inertia sum particle weights times square distance CG Save gram 20 inches CG have saved equivalent four grams 10 t tail end tucked engine kept moment inertia about horizontal axis low also keep low about vertical axis However also contrib uting axis extremities wingthe wing tips point favor tapered wings keeping tips light tapered wing has greater part its mass concentrated center airfoil wider thicker near CG low moment inertia about axis less sideward oscillation therefore greater directional stability addition lift conservation Maybe have sensed high-thrust ships particularly good gliders because thrust line high because weight engine high center lateral area see plan side view close same level CG plane will resist spiral dive tend hold its altitude accidentally put too tight turn under power glide has saved fatal spirals several times seems some hesitancy part some undersling rudder fear damage Im yet experience damaged rudder perhaps because light tail end softness touch down results experimental C ship beyond expectation have since built ship design classes first love Toothpicks l/2A design presented Toothpicks retains salient features experimental C ship exception skin first built Japanese tissue covering overlay 1/4-mil clear Mylar combination replaced apply 1 /2-mil Mylar lighter Japanese tissue coat dope cleans up rag allpurpose spray cleaner Gossamer Condor covered 1/2-mil Mylar attests its great strength An interesting sidelight Toothpicks has recent development proportionately smaller version wing area 240 sq total weight 50 ounces am using 5 1/4 X 3 Top Flite nylon prop reworked Cox Tee Dee 049 GlowBee racing head 70% nitro fuel concentrated blast air produced combination resulted need reverse auto stab ship trimmed glide well normal 65% balance point would slowly nose dive under full power up thrust reverse auto stab held trailing edge stab up during power down during glide cured problem Possibly forward CG smaller stab real 52 Model Aviation Original Class C experimental job Toothpicjcs derived Souped-up Fox 36 single by-pass 580 sq wing design stressed concentrating real weight elements close possible CGinvolving very light tail engine pulled back Refining approach evident beneficial effects both thetransition glide Toothpicks has built sizes including K&B 325 cc driven 520 sqin stretched version Text presents several good reasons support authois contention tapered wing way go answer curious see what effect changes pylon would make since full blast prop wash small winglet see photograph slanted up leading edge pylon produced frontend lift under power no noticeable affect glide valid solution Proceeding replaced pylon skewed 2 degrees trailing edge pylon pulled slightly toward right wingtip allow swirling prop wash slip pylon blowing left side did help reduce nose dive moreover removed need wing warps since almost elimi nated right turn effects prop wash Further discovered tab trailing edge pylon see photo effective under power reverse action tite contact cement thinned consis tency water lacquer thinner Overlap Mylar edges onto itself contact cement between Use heat iron sealing shrinking pin prick wing panel two fuselage necessary relieve hot air within envelope Mask off trailing 3 tops wing stab spray front k drying aerosol lacquer paint Stand back 3 4 feet spray lightly produce sandpaper effect forward sheeted part fuselage covered Japanese tissue two coats butyrate dope front inch over firewall given coat polyester resin Ponder weight part goes construction Dont give anything unnecessary free ride rudder tab Although lot development went design Toothpicks construction simple straight forward plans self-explanatory math buff may wish make single metal template aid cutting wing ribs since follow logarithmic spiral polar equation RO5e46 produces 8% thick airfoil length leading edge always origin R inches 6 radians balsa light weight contest grade except four long erons medium weight cement work model airplane glue except Tightbond 1/8-in firewall 2-in long soft solid balsa block Apply coat Balsarite surfaces Mylar adhered Include rib edges top bottom wing stab spars fuselage formers diag onals brush coat contact cement onto surfaces Use Quickstik Dura plane should trimmed cork screw right under power glide wide left circle corkscrew right really left barrel-roll combined right turn reality left barrel-roll predominates climb virtually straight up slight twist cork screw climb accomplished left thrust wing wash-in -out right rudder 6 3 prop works best Because planes lightweight acceleration extraordinary great fly-off flights surprisingly durable too because its light has no impact Ive flying same nearly three years its still like new recognize Coriolis Force causes thermals turn right Northern Hemisphere plane turning right centers thermal better also centers downer pretty good too Tooth picks turns slightly left glide stab flat because wing warps reasonably stable air avoids boom bust thermal flying Tight glide circles result frequent ac celeration deceleration planes mass turns down up wind less efficient steady state glide pattern avoided Because strategy air averaging turn radius should large think can live werent limited eyesight timers exhaustive chases field confinements straight down-wind glide would ideal So now soup-up 049 its worth fuel 6070% nitro watch Tcothpicks go Its hard beat wish express appreciation fellow members Central Ohio Free Flight Club particular Bill Hale Dick Smith Lou Willis support inspiration Harry Murphy Central Indiana Aeromodellers ap propriate name Tcothpicks June 1979 53 left stab tip pulled up bit turn can made loose left big glide circle enables plane traverse lot area average out ups downs generally necessary max Tcothpicks averaging Autnor 240 sq version Although high-thrust-line ship glides well Gil likes way lOw-thrust-liner can trimmed corkscrew under power fuselage line engine good hard landings subtle structural reasons see text Two Toothpicks First /2A Open 1978 Nats first Class Open Canadian Nats plus four firsts AMA meets past two years
Edition: Model Aviation - 1979/06
Page Numbers: 50, 51, 52, 53
NO OCR TEXT GIVEN few breaks almost plane field can win contest Perhaps best fliers run scared havent getting breaks take close look Toothpicks has some unconventional features can put thick things Toothpicks conceived particular attention given Light construction high strength-to-weight ratio B Low moment inertia about axes stabil ity transition glide C Low center lateral area resist spiral dives first design experimental Class-C job designed around souped-up Fox 36 standard single by-pass engine 580 sq wing few exceptions its features eventually carried through Toothpicks wing tapered cantilever strength wide flange beam locked geodetic ribs main spar wing stab covered Silkspan followed 2-mil music wire criss-crossing top bottom surfaces resist warp flutter followed 1/2-mil Mylar overlay moistureand fuel-proofing puncture resistance truss-type fuselage used mini mize moment inertia Simply put means real weight contributing elements plane concentrated close possible center gravity light tail end keeps extremely light order balance plane engine must placed close CG yields double benefit since weight being pulled both ends allows plane flip out awkward position might engine stops thereby avoiding loss altitude recovery dive low inertia also improves glide allowing plane ride up down freely minute air waves wing also stable under rather resolutely plowing through powerwhich high priority item plane light tail end engines becoming ever powerful engine pulled up under leading edge cant think single factor im June 1979 51 Cardboard profile Toothpicks used locate center lateral area Caption says CG profile its CIAnote white dot space line CG So pylon just pylon experimen tal pylons note winglet second top Bottom pylons skewedbottommost has pylon trim tab Like mysterious fins modern jets tricky surfaces have special effects trimming control aircraft Tootflplcks great fly-oilsa situation frequently finds itself Exceptional acceleration big factor Morris has used paint overspray front one-third wing stabilizer chords turbulation Mylar coveringlike Gossamer Condor portant light tail end three axes motion through CG horizontal axis about plane pitches up down vertical axis about plane takes right left direction longitudinal axis about plane rolls left right virtues low moment inertia about horizontal axis often thought discussed above about two other axes suspect could dwarf ourselves ride planes heaven forbid would find glide nearly serene see time plane changes attitude pitch turn roll slightly uses part its lift overcome inertia virtue design moment inertia can minimized lift conserved maintain altitude guess what reduces moment inertia about longitudinal axis plane can bank freely again light wing tips help keep down moment inertia about axis So high thrust line design trade-off comes like way low-thrust ship can trimmed corkscrew under power Like spinning bullet its track predictable Also structural reasons prefer fuselage line engine hard landing engine-first impact compressive forces fuselage di rect no bending moments requiring additional reinforcement weight rudder placed below stab order lower center lateral area 1/2-mil Mylar since 1/4-mil Mylar would overpower Japanese tissue causing wrinkle underneath defeat its purpose adding rigidity Also criss-crossed 2-mil music wire omitted structure strong enough important feature added Paint over-spray sandpaper-like quality applied front one-third wing stab top sides turbulation combination gives low drag surfaces except leading edge paint texture provides turbulation am compelled plug Mylar because offers essential advantages moisture resistant can get important early morning maxes air stable dense skin loosening dampness easy moment inertia sum particle weights times square distance CG Save gram 20 inches CG have saved equivalent four grams 10 t tail end tucked engine kept moment inertia about horizontal axis low also keep low about vertical axis However also contrib uting axis extremities wingthe wing tips point favor tapered wings keeping tips light tapered wing has greater part its mass concentrated center airfoil wider thicker near CG low moment inertia about axis less sideward oscillation therefore greater directional stability addition lift conservation Maybe have sensed high-thrust ships particularly good gliders because thrust line high because weight engine high center lateral area see plan side view close same level CG plane will resist spiral dive tend hold its altitude accidentally put too tight turn under power glide has saved fatal spirals several times seems some hesitancy part some undersling rudder fear damage Im yet experience damaged rudder perhaps because light tail end softness touch down results experimental C ship beyond expectation have since built ship design classes first love Toothpicks l/2A design presented Toothpicks retains salient features experimental C ship exception skin first built Japanese tissue covering overlay 1/4-mil clear Mylar combination replaced apply 1 /2-mil Mylar lighter Japanese tissue coat dope cleans up rag allpurpose spray cleaner Gossamer Condor covered 1/2-mil Mylar attests its great strength An interesting sidelight Toothpicks has recent development proportionately smaller version wing area 240 sq total weight 50 ounces am using 5 1/4 X 3 Top Flite nylon prop reworked Cox Tee Dee 049 GlowBee racing head 70% nitro fuel concentrated blast air produced combination resulted need reverse auto stab ship trimmed glide well normal 65% balance point would slowly nose dive under full power up thrust reverse auto stab held trailing edge stab up during power down during glide cured problem Possibly forward CG smaller stab real 52 Model Aviation Original Class C experimental job Toothpicjcs derived Souped-up Fox 36 single by-pass 580 sq wing design stressed concentrating real weight elements close possible CGinvolving very light tail engine pulled back Refining approach evident beneficial effects both thetransition glide Toothpicks has built sizes including K&B 325 cc driven 520 sqin stretched version Text presents several good reasons support authois contention tapered wing way go answer curious see what effect changes pylon would make since full blast prop wash small winglet see photograph slanted up leading edge pylon produced frontend lift under power no noticeable affect glide valid solution Proceeding replaced pylon skewed 2 degrees trailing edge pylon pulled slightly toward right wingtip allow swirling prop wash slip pylon blowing left side did help reduce nose dive moreover removed need wing warps since almost elimi nated right turn effects prop wash Further discovered tab trailing edge pylon see photo effective under power reverse action tite contact cement thinned consis tency water lacquer thinner Overlap Mylar edges onto itself contact cement between Use heat iron sealing shrinking pin prick wing panel two fuselage necessary relieve hot air within envelope Mask off trailing 3 tops wing stab spray front k drying aerosol lacquer paint Stand back 3 4 feet spray lightly produce sandpaper effect forward sheeted part fuselage covered Japanese tissue two coats butyrate dope front inch over firewall given coat polyester resin Ponder weight part goes construction Dont give anything unnecessary free ride rudder tab Although lot development went design Toothpicks construction simple straight forward plans self-explanatory math buff may wish make single metal template aid cutting wing ribs since follow logarithmic spiral polar equation RO5e46 produces 8% thick airfoil length leading edge always origin R inches 6 radians balsa light weight contest grade except four long erons medium weight cement work model airplane glue except Tightbond 1/8-in firewall 2-in long soft solid balsa block Apply coat Balsarite surfaces Mylar adhered Include rib edges top bottom wing stab spars fuselage formers diag onals brush coat contact cement onto surfaces Use Quickstik Dura plane should trimmed cork screw right under power glide wide left circle corkscrew right really left barrel-roll combined right turn reality left barrel-roll predominates climb virtually straight up slight twist cork screw climb accomplished left thrust wing wash-in -out right rudder 6 3 prop works best Because planes lightweight acceleration extraordinary great fly-off flights surprisingly durable too because its light has no impact Ive flying same nearly three years its still like new recognize Coriolis Force causes thermals turn right Northern Hemisphere plane turning right centers thermal better also centers downer pretty good too Tooth picks turns slightly left glide stab flat because wing warps reasonably stable air avoids boom bust thermal flying Tight glide circles result frequent ac celeration deceleration planes mass turns down up wind less efficient steady state glide pattern avoided Because strategy air averaging turn radius should large think can live werent limited eyesight timers exhaustive chases field confinements straight down-wind glide would ideal So now soup-up 049 its worth fuel 6070% nitro watch Tcothpicks go Its hard beat wish express appreciation fellow members Central Ohio Free Flight Club particular Bill Hale Dick Smith Lou Willis support inspiration Harry Murphy Central Indiana Aeromodellers ap propriate name Tcothpicks June 1979 53 left stab tip pulled up bit turn can made loose left big glide circle enables plane traverse lot area average out ups downs generally necessary max Tcothpicks averaging Autnor 240 sq version Although high-thrust-line ship glides well Gil likes way lOw-thrust-liner can trimmed corkscrew under power fuselage line engine good hard landings subtle structural reasons see text Two Toothpicks First /2A Open 1978 Nats first Class Open Canadian Nats plus four firsts AMA meets past two years
Edition: Model Aviation - 1979/06
Page Numbers: 50, 51, 52, 53
NO OCR TEXT GIVEN few breaks almost plane field can win contest Perhaps best fliers run scared havent getting breaks take close look Toothpicks has some unconventional features can put thick things Toothpicks conceived particular attention given Light construction high strength-to-weight ratio B Low moment inertia about axes stabil ity transition glide C Low center lateral area resist spiral dives first design experimental Class-C job designed around souped-up Fox 36 standard single by-pass engine 580 sq wing few exceptions its features eventually carried through Toothpicks wing tapered cantilever strength wide flange beam locked geodetic ribs main spar wing stab covered Silkspan followed 2-mil music wire criss-crossing top bottom surfaces resist warp flutter followed 1/2-mil Mylar overlay moistureand fuel-proofing puncture resistance truss-type fuselage used mini mize moment inertia Simply put means real weight contributing elements plane concentrated close possible center gravity light tail end keeps extremely light order balance plane engine must placed close CG yields double benefit since weight being pulled both ends allows plane flip out awkward position might engine stops thereby avoiding loss altitude recovery dive low inertia also improves glide allowing plane ride up down freely minute air waves wing also stable under rather resolutely plowing through powerwhich high priority item plane light tail end engines becoming ever powerful engine pulled up under leading edge cant think single factor im June 1979 51 Cardboard profile Toothpicks used locate center lateral area Caption says CG profile its CIAnote white dot space line CG So pylon just pylon experimen tal pylons note winglet second top Bottom pylons skewedbottommost has pylon trim tab Like mysterious fins modern jets tricky surfaces have special effects trimming control aircraft Tootflplcks great fly-oilsa situation frequently finds itself Exceptional acceleration big factor Morris has used paint overspray front one-third wing stabilizer chords turbulation Mylar coveringlike Gossamer Condor portant light tail end three axes motion through CG horizontal axis about plane pitches up down vertical axis about plane takes right left direction longitudinal axis about plane rolls left right virtues low moment inertia about horizontal axis often thought discussed above about two other axes suspect could dwarf ourselves ride planes heaven forbid would find glide nearly serene see time plane changes attitude pitch turn roll slightly uses part its lift overcome inertia virtue design moment inertia can minimized lift conserved maintain altitude guess what reduces moment inertia about longitudinal axis plane can bank freely again light wing tips help keep down moment inertia about axis So high thrust line design trade-off comes like way low-thrust ship can trimmed corkscrew under power Like spinning bullet its track predictable Also structural reasons prefer fuselage line engine hard landing engine-first impact compressive forces fuselage di rect no bending moments requiring additional reinforcement weight rudder placed below stab order lower center lateral area 1/2-mil Mylar since 1/4-mil Mylar would overpower Japanese tissue causing wrinkle underneath defeat its purpose adding rigidity Also criss-crossed 2-mil music wire omitted structure strong enough important feature added Paint over-spray sandpaper-like quality applied front one-third wing stab top sides turbulation combination gives low drag surfaces except leading edge paint texture provides turbulation am compelled plug Mylar because offers essential advantages moisture resistant can get important early morning maxes air stable dense skin loosening dampness easy moment inertia sum particle weights times square distance CG Save gram 20 inches CG have saved equivalent four grams 10 t tail end tucked engine kept moment inertia about horizontal axis low also keep low about vertical axis However also contrib uting axis extremities wingthe wing tips point favor tapered wings keeping tips light tapered wing has greater part its mass concentrated center airfoil wider thicker near CG low moment inertia about axis less sideward oscillation therefore greater directional stability addition lift conservation Maybe have sensed high-thrust ships particularly good gliders because thrust line high because weight engine high center lateral area see plan side view close same level CG plane will resist spiral dive tend hold its altitude accidentally put too tight turn under power glide has saved fatal spirals several times seems some hesitancy part some undersling rudder fear damage Im yet experience damaged rudder perhaps because light tail end softness touch down results experimental C ship beyond expectation have since built ship design classes first love Toothpicks l/2A design presented Toothpicks retains salient features experimental C ship exception skin first built Japanese tissue covering overlay 1/4-mil clear Mylar combination replaced apply 1 /2-mil Mylar lighter Japanese tissue coat dope cleans up rag allpurpose spray cleaner Gossamer Condor covered 1/2-mil Mylar attests its great strength An interesting sidelight Toothpicks has recent development proportionately smaller version wing area 240 sq total weight 50 ounces am using 5 1/4 X 3 Top Flite nylon prop reworked Cox Tee Dee 049 GlowBee racing head 70% nitro fuel concentrated blast air produced combination resulted need reverse auto stab ship trimmed glide well normal 65% balance point would slowly nose dive under full power up thrust reverse auto stab held trailing edge stab up during power down during glide cured problem Possibly forward CG smaller stab real 52 Model Aviation Original Class C experimental job Toothpicjcs derived Souped-up Fox 36 single by-pass 580 sq wing design stressed concentrating real weight elements close possible CGinvolving very light tail engine pulled back Refining approach evident beneficial effects both thetransition glide Toothpicks has built sizes including K&B 325 cc driven 520 sqin stretched version Text presents several good reasons support authois contention tapered wing way go answer curious see what effect changes pylon would make since full blast prop wash small winglet see photograph slanted up leading edge pylon produced frontend lift under power no noticeable affect glide valid solution Proceeding replaced pylon skewed 2 degrees trailing edge pylon pulled slightly toward right wingtip allow swirling prop wash slip pylon blowing left side did help reduce nose dive moreover removed need wing warps since almost elimi nated right turn effects prop wash Further discovered tab trailing edge pylon see photo effective under power reverse action tite contact cement thinned consis tency water lacquer thinner Overlap Mylar edges onto itself contact cement between Use heat iron sealing shrinking pin prick wing panel two fuselage necessary relieve hot air within envelope Mask off trailing 3 tops wing stab spray front k drying aerosol lacquer paint Stand back 3 4 feet spray lightly produce sandpaper effect forward sheeted part fuselage covered Japanese tissue two coats butyrate dope front inch over firewall given coat polyester resin Ponder weight part goes construction Dont give anything unnecessary free ride rudder tab Although lot development went design Toothpicks construction simple straight forward plans self-explanatory math buff may wish make single metal template aid cutting wing ribs since follow logarithmic spiral polar equation RO5e46 produces 8% thick airfoil length leading edge always origin R inches 6 radians balsa light weight contest grade except four long erons medium weight cement work model airplane glue except Tightbond 1/8-in firewall 2-in long soft solid balsa block Apply coat Balsarite surfaces Mylar adhered Include rib edges top bottom wing stab spars fuselage formers diag onals brush coat contact cement onto surfaces Use Quickstik Dura plane should trimmed cork screw right under power glide wide left circle corkscrew right really left barrel-roll combined right turn reality left barrel-roll predominates climb virtually straight up slight twist cork screw climb accomplished left thrust wing wash-in -out right rudder 6 3 prop works best Because planes lightweight acceleration extraordinary great fly-off flights surprisingly durable too because its light has no impact Ive flying same nearly three years its still like new recognize Coriolis Force causes thermals turn right Northern Hemisphere plane turning right centers thermal better also centers downer pretty good too Tooth picks turns slightly left glide stab flat because wing warps reasonably stable air avoids boom bust thermal flying Tight glide circles result frequent ac celeration deceleration planes mass turns down up wind less efficient steady state glide pattern avoided Because strategy air averaging turn radius should large think can live werent limited eyesight timers exhaustive chases field confinements straight down-wind glide would ideal So now soup-up 049 its worth fuel 6070% nitro watch Tcothpicks go Its hard beat wish express appreciation fellow members Central Ohio Free Flight Club particular Bill Hale Dick Smith Lou Willis support inspiration Harry Murphy Central Indiana Aeromodellers ap propriate name Tcothpicks June 1979 53 left stab tip pulled up bit turn can made loose left big glide circle enables plane traverse lot area average out ups downs generally necessary max Tcothpicks averaging Autnor 240 sq version Although high-thrust-line ship glides well Gil likes way lOw-thrust-liner can trimmed corkscrew under power fuselage line engine good hard landings subtle structural reasons see text Two Toothpicks First /2A Open 1978 Nats first Class Open Canadian Nats plus four firsts AMA meets past two years
Edition: Model Aviation - 1979/06
Page Numbers: 50, 51, 52, 53
NO OCR TEXT GIVEN few breaks almost plane field can win contest Perhaps best fliers run scared havent getting breaks take close look Toothpicks has some unconventional features can put thick things Toothpicks conceived particular attention given Light construction high strength-to-weight ratio B Low moment inertia about axes stabil ity transition glide C Low center lateral area resist spiral dives first design experimental Class-C job designed around souped-up Fox 36 standard single by-pass engine 580 sq wing few exceptions its features eventually carried through Toothpicks wing tapered cantilever strength wide flange beam locked geodetic ribs main spar wing stab covered Silkspan followed 2-mil music wire criss-crossing top bottom surfaces resist warp flutter followed 1/2-mil Mylar overlay moistureand fuel-proofing puncture resistance truss-type fuselage used mini mize moment inertia Simply put means real weight contributing elements plane concentrated close possible center gravity light tail end keeps extremely light order balance plane engine must placed close CG yields double benefit since weight being pulled both ends allows plane flip out awkward position might engine stops thereby avoiding loss altitude recovery dive low inertia also improves glide allowing plane ride up down freely minute air waves wing also stable under rather resolutely plowing through powerwhich high priority item plane light tail end engines becoming ever powerful engine pulled up under leading edge cant think single factor im June 1979 51 Cardboard profile Toothpicks used locate center lateral area Caption says CG profile its CIAnote white dot space line CG So pylon just pylon experimen tal pylons note winglet second top Bottom pylons skewedbottommost has pylon trim tab Like mysterious fins modern jets tricky surfaces have special effects trimming control aircraft Tootflplcks great fly-oilsa situation frequently finds itself Exceptional acceleration big factor Morris has used paint overspray front one-third wing stabilizer chords turbulation Mylar coveringlike Gossamer Condor portant light tail end three axes motion through CG horizontal axis about plane pitches up down vertical axis about plane takes right left direction longitudinal axis about plane rolls left right virtues low moment inertia about horizontal axis often thought discussed above about two other axes suspect could dwarf ourselves ride planes heaven forbid would find glide nearly serene see time plane changes attitude pitch turn roll slightly uses part its lift overcome inertia virtue design moment inertia can minimized lift conserved maintain altitude guess what reduces moment inertia about longitudinal axis plane can bank freely again light wing tips help keep down moment inertia about axis So high thrust line design trade-off comes like way low-thrust ship can trimmed corkscrew under power Like spinning bullet its track predictable Also structural reasons prefer fuselage line engine hard landing engine-first impact compressive forces fuselage di rect no bending moments requiring additional reinforcement weight rudder placed below stab order lower center lateral area 1/2-mil Mylar since 1/4-mil Mylar would overpower Japanese tissue causing wrinkle underneath defeat its purpose adding rigidity Also criss-crossed 2-mil music wire omitted structure strong enough important feature added Paint over-spray sandpaper-like quality applied front one-third wing stab top sides turbulation combination gives low drag surfaces except leading edge paint texture provides turbulation am compelled plug Mylar because offers essential advantages moisture resistant can get important early morning maxes air stable dense skin loosening dampness easy moment inertia sum particle weights times square distance CG Save gram 20 inches CG have saved equivalent four grams 10 t tail end tucked engine kept moment inertia about horizontal axis low also keep low about vertical axis However also contrib uting axis extremities wingthe wing tips point favor tapered wings keeping tips light tapered wing has greater part its mass concentrated center airfoil wider thicker near CG low moment inertia about axis less sideward oscillation therefore greater directional stability addition lift conservation Maybe have sensed high-thrust ships particularly good gliders because thrust line high because weight engine high center lateral area see plan side view close same level CG plane will resist spiral dive tend hold its altitude accidentally put too tight turn under power glide has saved fatal spirals several times seems some hesitancy part some undersling rudder fear damage Im yet experience damaged rudder perhaps because light tail end softness touch down results experimental C ship beyond expectation have since built ship design classes first love Toothpicks l/2A design presented Toothpicks retains salient features experimental C ship exception skin first built Japanese tissue covering overlay 1/4-mil clear Mylar combination replaced apply 1 /2-mil Mylar lighter Japanese tissue coat dope cleans up rag allpurpose spray cleaner Gossamer Condor covered 1/2-mil Mylar attests its great strength An interesting sidelight Toothpicks has recent development proportionately smaller version wing area 240 sq total weight 50 ounces am using 5 1/4 X 3 Top Flite nylon prop reworked Cox Tee Dee 049 GlowBee racing head 70% nitro fuel concentrated blast air produced combination resulted need reverse auto stab ship trimmed glide well normal 65% balance point would slowly nose dive under full power up thrust reverse auto stab held trailing edge stab up during power down during glide cured problem Possibly forward CG smaller stab real 52 Model Aviation Original Class C experimental job Toothpicjcs derived Souped-up Fox 36 single by-pass 580 sq wing design stressed concentrating real weight elements close possible CGinvolving very light tail engine pulled back Refining approach evident beneficial effects both thetransition glide Toothpicks has built sizes including K&B 325 cc driven 520 sqin stretched version Text presents several good reasons support authois contention tapered wing way go answer curious see what effect changes pylon would make since full blast prop wash small winglet see photograph slanted up leading edge pylon produced frontend lift under power no noticeable affect glide valid solution Proceeding replaced pylon skewed 2 degrees trailing edge pylon pulled slightly toward right wingtip allow swirling prop wash slip pylon blowing left side did help reduce nose dive moreover removed need wing warps since almost elimi nated right turn effects prop wash Further discovered tab trailing edge pylon see photo effective under power reverse action tite contact cement thinned consis tency water lacquer thinner Overlap Mylar edges onto itself contact cement between Use heat iron sealing shrinking pin prick wing panel two fuselage necessary relieve hot air within envelope Mask off trailing 3 tops wing stab spray front k drying aerosol lacquer paint Stand back 3 4 feet spray lightly produce sandpaper effect forward sheeted part fuselage covered Japanese tissue two coats butyrate dope front inch over firewall given coat polyester resin Ponder weight part goes construction Dont give anything unnecessary free ride rudder tab Although lot development went design Toothpicks construction simple straight forward plans self-explanatory math buff may wish make single metal template aid cutting wing ribs since follow logarithmic spiral polar equation RO5e46 produces 8% thick airfoil length leading edge always origin R inches 6 radians balsa light weight contest grade except four long erons medium weight cement work model airplane glue except Tightbond 1/8-in firewall 2-in long soft solid balsa block Apply coat Balsarite surfaces Mylar adhered Include rib edges top bottom wing stab spars fuselage formers diag onals brush coat contact cement onto surfaces Use Quickstik Dura plane should trimmed cork screw right under power glide wide left circle corkscrew right really left barrel-roll combined right turn reality left barrel-roll predominates climb virtually straight up slight twist cork screw climb accomplished left thrust wing wash-in -out right rudder 6 3 prop works best Because planes lightweight acceleration extraordinary great fly-off flights surprisingly durable too because its light has no impact Ive flying same nearly three years its still like new recognize Coriolis Force causes thermals turn right Northern Hemisphere plane turning right centers thermal better also centers downer pretty good too Tooth picks turns slightly left glide stab flat because wing warps reasonably stable air avoids boom bust thermal flying Tight glide circles result frequent ac celeration deceleration planes mass turns down up wind less efficient steady state glide pattern avoided Because strategy air averaging turn radius should large think can live werent limited eyesight timers exhaustive chases field confinements straight down-wind glide would ideal So now soup-up 049 its worth fuel 6070% nitro watch Tcothpicks go Its hard beat wish express appreciation fellow members Central Ohio Free Flight Club particular Bill Hale Dick Smith Lou Willis support inspiration Harry Murphy Central Indiana Aeromodellers ap propriate name Tcothpicks June 1979 53 left stab tip pulled up bit turn can made loose left big glide circle enables plane traverse lot area average out ups downs generally necessary max Tcothpicks averaging Autnor 240 sq version Although high-thrust-line ship glides well Gil likes way lOw-thrust-liner can trimmed corkscrew under power fuselage line engine good hard landings subtle structural reasons see text Two Toothpicks First /2A Open 1978 Nats first Class Open Canadian Nats plus four firsts AMA meets past two years