A new subminiature motor inspired creation Electric free flight model U Roland Schmidt HE INTRODUCTION subminiature KRl motor Mabuchi N20A0 Kenway Micro Flight Box 889 Hackettstown NJ 07840 has opened new realm aeromodelingreally small electric-powered free flight models indoor outdoor flying Flying Aces Stick first really successful gaspowered sport models capable flight wide range motors Baby Cyclones Ohlsson Gold Seals inherently very stable sensitive adjustments little replica much same will give builder much enjoyment model very simpleit almost builds itself However weight prime importance accurate gram scale almost necessity builder must select materials usual care adhesives dope must also used sparingly Kenway recommends modelminus prop motor switch batteriesweigh no eight grams Flying weight 24 grams prototype weighed 45 grams new After few collisions walls ceilings basketball hoops etc subsequent repairs its weight climbed 51 grams performance degraded Most model built six-pound-density balsa except wings leading trailing edges longerons cut eight-pound-density wood wingtips formed A6 x 1/32 strips have presoaked household ammonia least 30 minutes wrapped around prewaxed form allowed dry bonded thin cyanoacrylate glue CyA best preshape prebevel wing leading trailing edges before constructing wing panels install wing ribs gussets dihedral joints until outer panels assembled center section proper angle Carefully fit gussets achieve maximum strength wing covered Japanese tissue preshrunk water lightly misted very thin 51 Sig Lite-Coat dope still shrinking frame allowed cure 72 hours minimizes warpage temperature atmospheric changes prepare wing covering lightly sand structure remove irregularities dope top surface ribs tips leading edge trailing edge Sand lightly again Cut preshrunk tissue frame attach structure thinner Use conveniently sized pieces tissueso area can covered smoothly wrinkles Imagine tissue sheet metal can bent plane fuselage longerons assembled /is-sheet floor laminated nose former fitted omit A6-square piece between floor back nose pieceit establishes correct down-thrust angleThere small 1/s x 1/32 cutout corner floor nose former allow wing struts inserted Install front crossmember taper inner surfaces longerons draw together cement place Install remaining crossmembers tail surfaces shaped quarter-grained 1/32 sheet omit leading edgesthese combine quarter-grained sheet minimize warpage Sand mist thinned dope mentioned above Lightly sand again eliminate fuzz Bend landing gear shown main wheels roughly shaped 1/ sheet centers have 1A6 hole Thread 2-56 machine screw secure wheel blank washer nut Chuck screw electric drill Dremel Moto-Tool shape blank sandpaper block emery board Remove screw cement -inch-long piece 1/32 ID aluminum tubing serve axle bearing Install wheels gear retain washer drop cement Warning use CyA wheels may rotate spite care Use CyA glue landing gear area just forward floor pan under rear nose former Brace 1A2 plywood gussets shown plan shows tail wheel original Stickit just tail skid flying polished gym floor tail wheel almost necessity straight takeoff runs Stick does require takeoff run four five feet tail wheel made same manner main wheels except wheel 1As thick turned diameter snug fit 0-ring Mount tire secure CyA After CyA has set wheel still chucked up sand OD tire expose softer rubber plastic have flown tail-draggers swiveling tail wheels will remember sequence lock tail wheel mimmize ground-loops motor mounted between small cheeks held snugly tightly wire bail tightened twisting ends together mounting chosen allow motor slip backwards case impact protect 039 shaft angle cheeks allows side thrust adjustments means shims between cheeks rear motor same token shims can placed under front rear motor decrease increase downthrust Prewire switch several inches wire before installation before mounting wing Install wing cabane struts making certain correct length vertical firmly cemented full depth longerons Care must taken certain tail surfaces mounted squarely September 1993 51 Above right Photo flight testing shows simple construction general arrangement Note battery still bottom model Right Three-quarter rear view Flying Aces Stick replica shows ideal proportions sport model particular fin must aligned centerline fuselage will flying Stick mostly indoors small areas recommended wing offset usual Indoor manner See sketch plan However space no object mount wing centered certain leading trailing edges mount squarely cabanes good glue joints Battery installation can done model completed because batteries must used balance model flight Attach batteries underside model double-sided tape rubber band Start just behind midpoint wing chord Glide model grass possible adjust foreand-aft position batteries until glide smooth level shows no indication stalling diving Carefully mark battery position solder switch motor wire battery terminals install same position above floor pan using double-sided tape Add A2 plywood doubler bottom floor pan approximately midpoint batteries drill two A2 holes side batteries use wire bail firmly hold batteries place model completed soldering battery switch leads motor making sure polarity correct clockwise motor rotation right-hand prop using wooden prop comes motor carefully shape blades balance prop Finish several coats dope rebalance propeller ideally suited characteristics motor However case breakage interim substitute can made Cox 45 x 2 cut down 375 inches diameter lightened much possible will nearly gram heavier wood prop will necessitate rebalancing model Flying adjustment philosophy once model gliding fliers satisfaction necessary subsequent adjustments should made thrust line following sequence reflects philosophy individual fliers philosophy differs no matter really nothing set concrete modeling flying restricted area advisable first adjust glide circle fit area under low power adjust thrust line model will climb circles same diameter found approximately 125-15 degrees right thrust necessary overcome torque effect achieve nearly equal left-hand circles under power glide takeoff model has done 141 under 24-foot ceiling 40second charge 7A rate approximately /6 capacity indeed unfortunate some manufacturer does make Ni-Cds smaller 50 mAh full charge would pft little FA Stick far out sight six-minute-plus motor run see need smaller Ni-Cds FLY ELECTRIC odel Aviation e The Flying Aces Stick sweeps cobwebs ceiling Bedford Boys Ranch Bedford Texas Type FE Electric Sport Wingspan 15 inches Engine sizeltype KR1 subminiature Flying weight 24 grams Construction Built-up Coveringltinish Japanese tissue Lite-Coat dope /32N lop ernq 10 3h Y ZAm\naIbnsU recd IL ~t Ia12 plocs A- Vrnc P\anFormFioi N olc-1Ism\\ rbs9usse1s Q er paneA5 ore onedtYz Dihedro Isz Pb4 croospeceaiso floor /2 pl3hz 3/u l0s-Iqeron Cro5ibtr53/B Winq offset indoor 1ov underside_____ /si______ II0Ii-rj--------I ___I- 4.II II Z oii cries see eisiiron wire Nose -Z lam elO-tIons-/si-Radio 5YQCA23j-4OT4picol locoioi fti~Tn\ copper Siobcross -raIne050 Y3tThin coer or\roe\Jinq rIb Y quorer-ror II recjdfessLi.~ wreIAll STrus-V32'/8 p4oe$ - /K-lDroq \rnpaci broce-VIGY32 pli1/ 4 n-oor7 r--1 III __________ C/An slots noe--- o2tlJ prop 95GVA SXcV i1cro-Etectricie lico O/q2 Thrac trdeo Full Size Plans AvailableSee Page 176
Edition: Model Aviation - 1993/09
Page Numbers: 51, 52, 53
A new subminiature motor inspired creation Electric free flight model U Roland Schmidt HE INTRODUCTION subminiature KRl motor Mabuchi N20A0 Kenway Micro Flight Box 889 Hackettstown NJ 07840 has opened new realm aeromodelingreally small electric-powered free flight models indoor outdoor flying Flying Aces Stick first really successful gaspowered sport models capable flight wide range motors Baby Cyclones Ohlsson Gold Seals inherently very stable sensitive adjustments little replica much same will give builder much enjoyment model very simpleit almost builds itself However weight prime importance accurate gram scale almost necessity builder must select materials usual care adhesives dope must also used sparingly Kenway recommends modelminus prop motor switch batteriesweigh no eight grams Flying weight 24 grams prototype weighed 45 grams new After few collisions walls ceilings basketball hoops etc subsequent repairs its weight climbed 51 grams performance degraded Most model built six-pound-density balsa except wings leading trailing edges longerons cut eight-pound-density wood wingtips formed A6 x 1/32 strips have presoaked household ammonia least 30 minutes wrapped around prewaxed form allowed dry bonded thin cyanoacrylate glue CyA best preshape prebevel wing leading trailing edges before constructing wing panels install wing ribs gussets dihedral joints until outer panels assembled center section proper angle Carefully fit gussets achieve maximum strength wing covered Japanese tissue preshrunk water lightly misted very thin 51 Sig Lite-Coat dope still shrinking frame allowed cure 72 hours minimizes warpage temperature atmospheric changes prepare wing covering lightly sand structure remove irregularities dope top surface ribs tips leading edge trailing edge Sand lightly again Cut preshrunk tissue frame attach structure thinner Use conveniently sized pieces tissueso area can covered smoothly wrinkles Imagine tissue sheet metal can bent plane fuselage longerons assembled /is-sheet floor laminated nose former fitted omit A6-square piece between floor back nose pieceit establishes correct down-thrust angleThere small 1/s x 1/32 cutout corner floor nose former allow wing struts inserted Install front crossmember taper inner surfaces longerons draw together cement place Install remaining crossmembers tail surfaces shaped quarter-grained 1/32 sheet omit leading edgesthese combine quarter-grained sheet minimize warpage Sand mist thinned dope mentioned above Lightly sand again eliminate fuzz Bend landing gear shown main wheels roughly shaped 1/ sheet centers have 1A6 hole Thread 2-56 machine screw secure wheel blank washer nut Chuck screw electric drill Dremel Moto-Tool shape blank sandpaper block emery board Remove screw cement -inch-long piece 1/32 ID aluminum tubing serve axle bearing Install wheels gear retain washer drop cement Warning use CyA wheels may rotate spite care Use CyA glue landing gear area just forward floor pan under rear nose former Brace 1A2 plywood gussets shown plan shows tail wheel original Stickit just tail skid flying polished gym floor tail wheel almost necessity straight takeoff runs Stick does require takeoff run four five feet tail wheel made same manner main wheels except wheel 1As thick turned diameter snug fit 0-ring Mount tire secure CyA After CyA has set wheel still chucked up sand OD tire expose softer rubber plastic have flown tail-draggers swiveling tail wheels will remember sequence lock tail wheel mimmize ground-loops motor mounted between small cheeks held snugly tightly wire bail tightened twisting ends together mounting chosen allow motor slip backwards case impact protect 039 shaft angle cheeks allows side thrust adjustments means shims between cheeks rear motor same token shims can placed under front rear motor decrease increase downthrust Prewire switch several inches wire before installation before mounting wing Install wing cabane struts making certain correct length vertical firmly cemented full depth longerons Care must taken certain tail surfaces mounted squarely September 1993 51 Above right Photo flight testing shows simple construction general arrangement Note battery still bottom model Right Three-quarter rear view Flying Aces Stick replica shows ideal proportions sport model particular fin must aligned centerline fuselage will flying Stick mostly indoors small areas recommended wing offset usual Indoor manner See sketch plan However space no object mount wing centered certain leading trailing edges mount squarely cabanes good glue joints Battery installation can done model completed because batteries must used balance model flight Attach batteries underside model double-sided tape rubber band Start just behind midpoint wing chord Glide model grass possible adjust foreand-aft position batteries until glide smooth level shows no indication stalling diving Carefully mark battery position solder switch motor wire battery terminals install same position above floor pan using double-sided tape Add A2 plywood doubler bottom floor pan approximately midpoint batteries drill two A2 holes side batteries use wire bail firmly hold batteries place model completed soldering battery switch leads motor making sure polarity correct clockwise motor rotation right-hand prop using wooden prop comes motor carefully shape blades balance prop Finish several coats dope rebalance propeller ideally suited characteristics motor However case breakage interim substitute can made Cox 45 x 2 cut down 375 inches diameter lightened much possible will nearly gram heavier wood prop will necessitate rebalancing model Flying adjustment philosophy once model gliding fliers satisfaction necessary subsequent adjustments should made thrust line following sequence reflects philosophy individual fliers philosophy differs no matter really nothing set concrete modeling flying restricted area advisable first adjust glide circle fit area under low power adjust thrust line model will climb circles same diameter found approximately 125-15 degrees right thrust necessary overcome torque effect achieve nearly equal left-hand circles under power glide takeoff model has done 141 under 24-foot ceiling 40second charge 7A rate approximately /6 capacity indeed unfortunate some manufacturer does make Ni-Cds smaller 50 mAh full charge would pft little FA Stick far out sight six-minute-plus motor run see need smaller Ni-Cds FLY ELECTRIC odel Aviation e The Flying Aces Stick sweeps cobwebs ceiling Bedford Boys Ranch Bedford Texas Type FE Electric Sport Wingspan 15 inches Engine sizeltype KR1 subminiature Flying weight 24 grams Construction Built-up Coveringltinish Japanese tissue Lite-Coat dope /32N lop ernq 10 3h Y ZAm\naIbnsU recd IL ~t Ia12 plocs A- Vrnc P\anFormFioi N olc-1Ism\\ rbs9usse1s Q er paneA5 ore onedtYz Dihedro Isz Pb4 croospeceaiso floor /2 pl3hz 3/u l0s-Iqeron Cro5ibtr53/B Winq offset indoor 1ov underside_____ /si______ II0Ii-rj--------I ___I- 4.II II Z oii cries see eisiiron wire Nose -Z lam elO-tIons-/si-Radio 5YQCA23j-4OT4picol locoioi fti~Tn\ copper Siobcross -raIne050 Y3tThin coer or\roe\Jinq rIb Y quorer-ror II recjdfessLi.~ wreIAll STrus-V32'/8 p4oe$ - /K-lDroq \rnpaci broce-VIGY32 pli1/ 4 n-oor7 r--1 III __________ C/An slots noe--- o2tlJ prop 95GVA SXcV i1cro-Etectricie lico O/q2 Thrac trdeo Full Size Plans AvailableSee Page 176
Edition: Model Aviation - 1993/09
Page Numbers: 51, 52, 53
A new subminiature motor inspired creation Electric free flight model U Roland Schmidt HE INTRODUCTION subminiature KRl motor Mabuchi N20A0 Kenway Micro Flight Box 889 Hackettstown NJ 07840 has opened new realm aeromodelingreally small electric-powered free flight models indoor outdoor flying Flying Aces Stick first really successful gaspowered sport models capable flight wide range motors Baby Cyclones Ohlsson Gold Seals inherently very stable sensitive adjustments little replica much same will give builder much enjoyment model very simpleit almost builds itself However weight prime importance accurate gram scale almost necessity builder must select materials usual care adhesives dope must also used sparingly Kenway recommends modelminus prop motor switch batteriesweigh no eight grams Flying weight 24 grams prototype weighed 45 grams new After few collisions walls ceilings basketball hoops etc subsequent repairs its weight climbed 51 grams performance degraded Most model built six-pound-density balsa except wings leading trailing edges longerons cut eight-pound-density wood wingtips formed A6 x 1/32 strips have presoaked household ammonia least 30 minutes wrapped around prewaxed form allowed dry bonded thin cyanoacrylate glue CyA best preshape prebevel wing leading trailing edges before constructing wing panels install wing ribs gussets dihedral joints until outer panels assembled center section proper angle Carefully fit gussets achieve maximum strength wing covered Japanese tissue preshrunk water lightly misted very thin 51 Sig Lite-Coat dope still shrinking frame allowed cure 72 hours minimizes warpage temperature atmospheric changes prepare wing covering lightly sand structure remove irregularities dope top surface ribs tips leading edge trailing edge Sand lightly again Cut preshrunk tissue frame attach structure thinner Use conveniently sized pieces tissueso area can covered smoothly wrinkles Imagine tissue sheet metal can bent plane fuselage longerons assembled /is-sheet floor laminated nose former fitted omit A6-square piece between floor back nose pieceit establishes correct down-thrust angleThere small 1/s x 1/32 cutout corner floor nose former allow wing struts inserted Install front crossmember taper inner surfaces longerons draw together cement place Install remaining crossmembers tail surfaces shaped quarter-grained 1/32 sheet omit leading edgesthese combine quarter-grained sheet minimize warpage Sand mist thinned dope mentioned above Lightly sand again eliminate fuzz Bend landing gear shown main wheels roughly shaped 1/ sheet centers have 1A6 hole Thread 2-56 machine screw secure wheel blank washer nut Chuck screw electric drill Dremel Moto-Tool shape blank sandpaper block emery board Remove screw cement -inch-long piece 1/32 ID aluminum tubing serve axle bearing Install wheels gear retain washer drop cement Warning use CyA wheels may rotate spite care Use CyA glue landing gear area just forward floor pan under rear nose former Brace 1A2 plywood gussets shown plan shows tail wheel original Stickit just tail skid flying polished gym floor tail wheel almost necessity straight takeoff runs Stick does require takeoff run four five feet tail wheel made same manner main wheels except wheel 1As thick turned diameter snug fit 0-ring Mount tire secure CyA After CyA has set wheel still chucked up sand OD tire expose softer rubber plastic have flown tail-draggers swiveling tail wheels will remember sequence lock tail wheel mimmize ground-loops motor mounted between small cheeks held snugly tightly wire bail tightened twisting ends together mounting chosen allow motor slip backwards case impact protect 039 shaft angle cheeks allows side thrust adjustments means shims between cheeks rear motor same token shims can placed under front rear motor decrease increase downthrust Prewire switch several inches wire before installation before mounting wing Install wing cabane struts making certain correct length vertical firmly cemented full depth longerons Care must taken certain tail surfaces mounted squarely September 1993 51 Above right Photo flight testing shows simple construction general arrangement Note battery still bottom model Right Three-quarter rear view Flying Aces Stick replica shows ideal proportions sport model particular fin must aligned centerline fuselage will flying Stick mostly indoors small areas recommended wing offset usual Indoor manner See sketch plan However space no object mount wing centered certain leading trailing edges mount squarely cabanes good glue joints Battery installation can done model completed because batteries must used balance model flight Attach batteries underside model double-sided tape rubber band Start just behind midpoint wing chord Glide model grass possible adjust foreand-aft position batteries until glide smooth level shows no indication stalling diving Carefully mark battery position solder switch motor wire battery terminals install same position above floor pan using double-sided tape Add A2 plywood doubler bottom floor pan approximately midpoint batteries drill two A2 holes side batteries use wire bail firmly hold batteries place model completed soldering battery switch leads motor making sure polarity correct clockwise motor rotation right-hand prop using wooden prop comes motor carefully shape blades balance prop Finish several coats dope rebalance propeller ideally suited characteristics motor However case breakage interim substitute can made Cox 45 x 2 cut down 375 inches diameter lightened much possible will nearly gram heavier wood prop will necessitate rebalancing model Flying adjustment philosophy once model gliding fliers satisfaction necessary subsequent adjustments should made thrust line following sequence reflects philosophy individual fliers philosophy differs no matter really nothing set concrete modeling flying restricted area advisable first adjust glide circle fit area under low power adjust thrust line model will climb circles same diameter found approximately 125-15 degrees right thrust necessary overcome torque effect achieve nearly equal left-hand circles under power glide takeoff model has done 141 under 24-foot ceiling 40second charge 7A rate approximately /6 capacity indeed unfortunate some manufacturer does make Ni-Cds smaller 50 mAh full charge would pft little FA Stick far out sight six-minute-plus motor run see need smaller Ni-Cds FLY ELECTRIC odel Aviation e The Flying Aces Stick sweeps cobwebs ceiling Bedford Boys Ranch Bedford Texas Type FE Electric Sport Wingspan 15 inches Engine sizeltype KR1 subminiature Flying weight 24 grams Construction Built-up Coveringltinish Japanese tissue Lite-Coat dope /32N lop ernq 10 3h Y ZAm\naIbnsU recd IL ~t Ia12 plocs A- Vrnc P\anFormFioi N olc-1Ism\\ rbs9usse1s Q er paneA5 ore onedtYz Dihedro Isz Pb4 croospeceaiso floor /2 pl3hz 3/u l0s-Iqeron Cro5ibtr53/B Winq offset indoor 1ov underside_____ /si______ II0Ii-rj--------I ___I- 4.II II Z oii cries see eisiiron wire Nose -Z lam elO-tIons-/si-Radio 5YQCA23j-4OT4picol locoioi fti~Tn\ copper Siobcross -raIne050 Y3tThin coer or\roe\Jinq rIb Y quorer-ror II recjdfessLi.~ wreIAll STrus-V32'/8 p4oe$ - /K-lDroq \rnpaci broce-VIGY32 pli1/ 4 n-oor7 r--1 III __________ C/An slots noe--- o2tlJ prop 95GVA SXcV i1cro-Etectricie lico O/q2 Thrac trdeo Full Size Plans AvailableSee Page 176