THIS months topics include Ron Dulys record-setting Class II some related thoughts trimming Carrier models plus some discussion flapsboth simple complex Class II record time written belongs Ron Duly Burbank California model prototype XTB3F-25 Grumman Guardian 36m wing span basically Sterling kit fuselage new wing tail surfaces match prototype outlines wing carved solid piece a 1/64 plywood inserts leading trailing edges Flaps ailerons used rudder fixed Ron uses stock Rossi ABC 60 piped-timed liner non-Schnuerle Rons normal fuel 70% nitromethane 10% propolene oxide 20% oil fed means metal tank crankcase pressure throttle system Bill Johnson type fuel meter exhaust slide Ron has done well combination some time including first 1977 NATS record performance result improvements propeller low-speed handling Ron used Rev-up 108W prop pitched up true 8-inch pitch prop latest best series props changed increments pitch stock 108W prop approximately 7inch pitch based back blade Low speed handling improved shifting center-of-gravity CG aft slightly Ron gave no details exact balance point suspect about 15% 20% mean aerodynamic chord MACabout 20% 25% root chord Guardian wing CG located 15% 20% MAC large tail volume ratio high powered propeller-driven prototypes should provide plenty elevator effectiveness hold nose attitude wing stalled matter Continued page 111 May1979 39 ,hanismflaps 1 gu Iuuu 4 hinge tube flap 5 pin release 6 DuBro ball link iJ iia wire track 8 brass tube slider 9 spring 10 follower arm profile F4U-1A Corsair needs grow up little before can compete Profile Carri er event Built Gary Hull has 84n spanand uses Cox 02 power Ron Duly placed first Class Class II 1977 Nats XTB3F-2S Guard ians Class II holds current record See text details model movements airplane flight pitch roll yaw revolve around Center Gravity simplest terms flying CL model tethering full-fledged aircraft circle around Naturally would ideally want hookup right aircrafts CG try actual practice normally sweep leadouts back wingtip just slightly CG compensate extra drag control lines discussed January column locate top view wing plan leadouts fore aft location tip relation models CG way average chord didnt get question leadouts vertical location end wing its relationship CG start can imagine what would happen hooked control lines up models nose tail wouldnt fly very well say least Well same would true although extreme hookup too high too low verticallylike say top canopy bottom landing gear leadouts near end wing should approximately line height-wise Center Gravity Drawing No 2 shows some basic exam ples different configurations aircraft dont know precise way find before model built exactly CG going vertically get models leadouts ballpark should cruise naturally level flight about shoulder height wings per fectly level ground need aileron deflection However its good idea make ailerons model movable just case Murphys Law #1 can happen will should come play will look much scale-like hinged can adjusted necessary after test flying compensate tendency wing fly higher lower other level flight Mike Gretz Box 162 Montezuma IA 501 71 CL Navy Carrier/Perry continued page 39 practice learn characteristics model engine perfect smooth throttle technique Balance practice good throttle tech nique important factors good low speed Neither Ron nor use moveable leadouts 20-mph flights pose no prob lems Ron uses ailerons about half Class Class II fliers side other half dont use aileronsits simpler think wing-tip weight effective ailerons maintaining line tension under flight conditions simply matter personal preference further problem often encountered low-speed flight oscillation roll near stall Rog Edwards Albuquerque New Mexico have both found washing out wing tips twisting tip leading edge down two three degrees can help solve oscillation problem Smooth throttle technique also seems help technique have found work very well Class Class II models set engine thrust line horizon tal stabilizer level zero incidence set wing root two degrees positive incidence measured leading edge trailing edge along bottom airfoil two-degree washout puts wing tips zero incidence results very light loading tips during highspeed flight seems improve elevator effectiveness during slow flight Bob Reynolds Tucson Arizona has developed system operating Youngman flaps Fairey Firefly shown accompanying drawing pin holds flaps retracted position re leased flaps move down out wing swing back position near trailing edge wing spring pulls slide assembly aft As slide reaches end follower arm moves over curved end wire allowing second spring deflect flaps Bobs system comes very close dupli cating operation flaps prototype result effective increase wing area flaps deployed May1979 111 CESS Perhaps need something bit outof-the ordinary scale competition Cessna 182 big stable airplane ideal scale trainer 40 engine Put 80 under cowl fly circles around competition semi-symmetrical airfoil makes 182 groove yet its docile kitten total scale realism add optional flaps Trike gear pleasant ground handling kit allbalsa lots hardware molded parts speedy construction clear plans special illustrated construction booklet make kit anyone can build KIt features Span 72 Area 702 Sq 5-7 lbs flying weight 4 channel Power 40 80 Bobs design allows flaps blow up streamlined position should deploy during high-speed flight Although flap systems like Bobs joy behold necessary good low-speed performance fact people prefer use no flaps think flaps offer slight advantage lowspeed performance particularly model flown stalling prop-hanging profile Carrier two-minute low speeds 15 mph quite possible using flaps model can near-level attitude simplest flap type used almost universally Carrier plain flap plain flap type flap used Stunt ships flap simply hinged rear airfoil section Top Elite Elite Streak Sterling Mustang kits have fixed sheet-balsa flaps can easily hinged form plain flaps common method operating flaps use conventional horn pushrod attached another horn tadhook tailhook deploys flaps deployed also use spring clevis end pushrod allows adjustment amount flap deflection Thus flap travel can adjusted suit existing wind conditions Flaps effective chord least 10% wing chord 20% Flaps work best thickerwings least 15% thickness ratio effective thinner wings well key effective flap operation blunt wellrounded leading edge Richard L Periy 5016 Angelita Ave Dayton OH 45424 Crash master/H u nton continued page 42 let us talk through Begin wind tail Start engine certain developing good power slightly rich side Make habit perform two pre-takeoff checks check handle right side up visually checking pull up elevator goes up Also have mechanic wait clear visual signal before releasing plane 112 Model Aviation
Edition: Model Aviation - 1979/05
Page Numbers: 39, 111, 112
THIS months topics include Ron Dulys record-setting Class II some related thoughts trimming Carrier models plus some discussion flapsboth simple complex Class II record time written belongs Ron Duly Burbank California model prototype XTB3F-25 Grumman Guardian 36m wing span basically Sterling kit fuselage new wing tail surfaces match prototype outlines wing carved solid piece a 1/64 plywood inserts leading trailing edges Flaps ailerons used rudder fixed Ron uses stock Rossi ABC 60 piped-timed liner non-Schnuerle Rons normal fuel 70% nitromethane 10% propolene oxide 20% oil fed means metal tank crankcase pressure throttle system Bill Johnson type fuel meter exhaust slide Ron has done well combination some time including first 1977 NATS record performance result improvements propeller low-speed handling Ron used Rev-up 108W prop pitched up true 8-inch pitch prop latest best series props changed increments pitch stock 108W prop approximately 7inch pitch based back blade Low speed handling improved shifting center-of-gravity CG aft slightly Ron gave no details exact balance point suspect about 15% 20% mean aerodynamic chord MACabout 20% 25% root chord Guardian wing CG located 15% 20% MAC large tail volume ratio high powered propeller-driven prototypes should provide plenty elevator effectiveness hold nose attitude wing stalled matter Continued page 111 May1979 39 ,hanismflaps 1 gu Iuuu 4 hinge tube flap 5 pin release 6 DuBro ball link iJ iia wire track 8 brass tube slider 9 spring 10 follower arm profile F4U-1A Corsair needs grow up little before can compete Profile Carri er event Built Gary Hull has 84n spanand uses Cox 02 power Ron Duly placed first Class Class II 1977 Nats XTB3F-2S Guard ians Class II holds current record See text details model movements airplane flight pitch roll yaw revolve around Center Gravity simplest terms flying CL model tethering full-fledged aircraft circle around Naturally would ideally want hookup right aircrafts CG try actual practice normally sweep leadouts back wingtip just slightly CG compensate extra drag control lines discussed January column locate top view wing plan leadouts fore aft location tip relation models CG way average chord didnt get question leadouts vertical location end wing its relationship CG start can imagine what would happen hooked control lines up models nose tail wouldnt fly very well say least Well same would true although extreme hookup too high too low verticallylike say top canopy bottom landing gear leadouts near end wing should approximately line height-wise Center Gravity Drawing No 2 shows some basic exam ples different configurations aircraft dont know precise way find before model built exactly CG going vertically get models leadouts ballpark should cruise naturally level flight about shoulder height wings per fectly level ground need aileron deflection However its good idea make ailerons model movable just case Murphys Law #1 can happen will should come play will look much scale-like hinged can adjusted necessary after test flying compensate tendency wing fly higher lower other level flight Mike Gretz Box 162 Montezuma IA 501 71 CL Navy Carrier/Perry continued page 39 practice learn characteristics model engine perfect smooth throttle technique Balance practice good throttle tech nique important factors good low speed Neither Ron nor use moveable leadouts 20-mph flights pose no prob lems Ron uses ailerons about half Class Class II fliers side other half dont use aileronsits simpler think wing-tip weight effective ailerons maintaining line tension under flight conditions simply matter personal preference further problem often encountered low-speed flight oscillation roll near stall Rog Edwards Albuquerque New Mexico have both found washing out wing tips twisting tip leading edge down two three degrees can help solve oscillation problem Smooth throttle technique also seems help technique have found work very well Class Class II models set engine thrust line horizon tal stabilizer level zero incidence set wing root two degrees positive incidence measured leading edge trailing edge along bottom airfoil two-degree washout puts wing tips zero incidence results very light loading tips during highspeed flight seems improve elevator effectiveness during slow flight Bob Reynolds Tucson Arizona has developed system operating Youngman flaps Fairey Firefly shown accompanying drawing pin holds flaps retracted position re leased flaps move down out wing swing back position near trailing edge wing spring pulls slide assembly aft As slide reaches end follower arm moves over curved end wire allowing second spring deflect flaps Bobs system comes very close dupli cating operation flaps prototype result effective increase wing area flaps deployed May1979 111 CESS Perhaps need something bit outof-the ordinary scale competition Cessna 182 big stable airplane ideal scale trainer 40 engine Put 80 under cowl fly circles around competition semi-symmetrical airfoil makes 182 groove yet its docile kitten total scale realism add optional flaps Trike gear pleasant ground handling kit allbalsa lots hardware molded parts speedy construction clear plans special illustrated construction booklet make kit anyone can build KIt features Span 72 Area 702 Sq 5-7 lbs flying weight 4 channel Power 40 80 Bobs design allows flaps blow up streamlined position should deploy during high-speed flight Although flap systems like Bobs joy behold necessary good low-speed performance fact people prefer use no flaps think flaps offer slight advantage lowspeed performance particularly model flown stalling prop-hanging profile Carrier two-minute low speeds 15 mph quite possible using flaps model can near-level attitude simplest flap type used almost universally Carrier plain flap plain flap type flap used Stunt ships flap simply hinged rear airfoil section Top Elite Elite Streak Sterling Mustang kits have fixed sheet-balsa flaps can easily hinged form plain flaps common method operating flaps use conventional horn pushrod attached another horn tadhook tailhook deploys flaps deployed also use spring clevis end pushrod allows adjustment amount flap deflection Thus flap travel can adjusted suit existing wind conditions Flaps effective chord least 10% wing chord 20% Flaps work best thickerwings least 15% thickness ratio effective thinner wings well key effective flap operation blunt wellrounded leading edge Richard L Periy 5016 Angelita Ave Dayton OH 45424 Crash master/H u nton continued page 42 let us talk through Begin wind tail Start engine certain developing good power slightly rich side Make habit perform two pre-takeoff checks check handle right side up visually checking pull up elevator goes up Also have mechanic wait clear visual signal before releasing plane 112 Model Aviation
Edition: Model Aviation - 1979/05
Page Numbers: 39, 111, 112
THIS months topics include Ron Dulys record-setting Class II some related thoughts trimming Carrier models plus some discussion flapsboth simple complex Class II record time written belongs Ron Duly Burbank California model prototype XTB3F-25 Grumman Guardian 36m wing span basically Sterling kit fuselage new wing tail surfaces match prototype outlines wing carved solid piece a 1/64 plywood inserts leading trailing edges Flaps ailerons used rudder fixed Ron uses stock Rossi ABC 60 piped-timed liner non-Schnuerle Rons normal fuel 70% nitromethane 10% propolene oxide 20% oil fed means metal tank crankcase pressure throttle system Bill Johnson type fuel meter exhaust slide Ron has done well combination some time including first 1977 NATS record performance result improvements propeller low-speed handling Ron used Rev-up 108W prop pitched up true 8-inch pitch prop latest best series props changed increments pitch stock 108W prop approximately 7inch pitch based back blade Low speed handling improved shifting center-of-gravity CG aft slightly Ron gave no details exact balance point suspect about 15% 20% mean aerodynamic chord MACabout 20% 25% root chord Guardian wing CG located 15% 20% MAC large tail volume ratio high powered propeller-driven prototypes should provide plenty elevator effectiveness hold nose attitude wing stalled matter Continued page 111 May1979 39 ,hanismflaps 1 gu Iuuu 4 hinge tube flap 5 pin release 6 DuBro ball link iJ iia wire track 8 brass tube slider 9 spring 10 follower arm profile F4U-1A Corsair needs grow up little before can compete Profile Carri er event Built Gary Hull has 84n spanand uses Cox 02 power Ron Duly placed first Class Class II 1977 Nats XTB3F-2S Guard ians Class II holds current record See text details model movements airplane flight pitch roll yaw revolve around Center Gravity simplest terms flying CL model tethering full-fledged aircraft circle around Naturally would ideally want hookup right aircrafts CG try actual practice normally sweep leadouts back wingtip just slightly CG compensate extra drag control lines discussed January column locate top view wing plan leadouts fore aft location tip relation models CG way average chord didnt get question leadouts vertical location end wing its relationship CG start can imagine what would happen hooked control lines up models nose tail wouldnt fly very well say least Well same would true although extreme hookup too high too low verticallylike say top canopy bottom landing gear leadouts near end wing should approximately line height-wise Center Gravity Drawing No 2 shows some basic exam ples different configurations aircraft dont know precise way find before model built exactly CG going vertically get models leadouts ballpark should cruise naturally level flight about shoulder height wings per fectly level ground need aileron deflection However its good idea make ailerons model movable just case Murphys Law #1 can happen will should come play will look much scale-like hinged can adjusted necessary after test flying compensate tendency wing fly higher lower other level flight Mike Gretz Box 162 Montezuma IA 501 71 CL Navy Carrier/Perry continued page 39 practice learn characteristics model engine perfect smooth throttle technique Balance practice good throttle tech nique important factors good low speed Neither Ron nor use moveable leadouts 20-mph flights pose no prob lems Ron uses ailerons about half Class Class II fliers side other half dont use aileronsits simpler think wing-tip weight effective ailerons maintaining line tension under flight conditions simply matter personal preference further problem often encountered low-speed flight oscillation roll near stall Rog Edwards Albuquerque New Mexico have both found washing out wing tips twisting tip leading edge down two three degrees can help solve oscillation problem Smooth throttle technique also seems help technique have found work very well Class Class II models set engine thrust line horizon tal stabilizer level zero incidence set wing root two degrees positive incidence measured leading edge trailing edge along bottom airfoil two-degree washout puts wing tips zero incidence results very light loading tips during highspeed flight seems improve elevator effectiveness during slow flight Bob Reynolds Tucson Arizona has developed system operating Youngman flaps Fairey Firefly shown accompanying drawing pin holds flaps retracted position re leased flaps move down out wing swing back position near trailing edge wing spring pulls slide assembly aft As slide reaches end follower arm moves over curved end wire allowing second spring deflect flaps Bobs system comes very close dupli cating operation flaps prototype result effective increase wing area flaps deployed May1979 111 CESS Perhaps need something bit outof-the ordinary scale competition Cessna 182 big stable airplane ideal scale trainer 40 engine Put 80 under cowl fly circles around competition semi-symmetrical airfoil makes 182 groove yet its docile kitten total scale realism add optional flaps Trike gear pleasant ground handling kit allbalsa lots hardware molded parts speedy construction clear plans special illustrated construction booklet make kit anyone can build KIt features Span 72 Area 702 Sq 5-7 lbs flying weight 4 channel Power 40 80 Bobs design allows flaps blow up streamlined position should deploy during high-speed flight Although flap systems like Bobs joy behold necessary good low-speed performance fact people prefer use no flaps think flaps offer slight advantage lowspeed performance particularly model flown stalling prop-hanging profile Carrier two-minute low speeds 15 mph quite possible using flaps model can near-level attitude simplest flap type used almost universally Carrier plain flap plain flap type flap used Stunt ships flap simply hinged rear airfoil section Top Elite Elite Streak Sterling Mustang kits have fixed sheet-balsa flaps can easily hinged form plain flaps common method operating flaps use conventional horn pushrod attached another horn tadhook tailhook deploys flaps deployed also use spring clevis end pushrod allows adjustment amount flap deflection Thus flap travel can adjusted suit existing wind conditions Flaps effective chord least 10% wing chord 20% Flaps work best thickerwings least 15% thickness ratio effective thinner wings well key effective flap operation blunt wellrounded leading edge Richard L Periy 5016 Angelita Ave Dayton OH 45424 Crash master/H u nton continued page 42 let us talk through Begin wind tail Start engine certain developing good power slightly rich side Make habit perform two pre-takeoff checks check handle right side up visually checking pull up elevator goes up Also have mechanic wait clear visual signal before releasing plane 112 Model Aviation