S Helicopters EJ Wall Schoonard EVEN THOUGH helicopter rules have voted will 197879 Rule Book printing event itself will part regular Nationals until later Because fact large portion RC helicopter activity eastern part country has decided hold 1977 Helicopter Nationals South Bend Indiana June 10 11 12 will held three days Tn-Valley RC field 14154 Cleveland Road South Bend diana events will Novice Interme diate Expert Scale awards through three places plus Best ScratchBuilt helicopter reason adding third day expecting large entry will permit us run leisurely pace also will give time contestants get act gether South Bend area has plenty major motels good restaurants reservations call Holiday Inn South Bend219-272-6600 Howard Johnsons South219-272-1500 Ramada Inn South Bend219-272-5220 Ramada Inn Elk hart219-262-1581 8 Days Inn Elkhart 219-262-3541 Holiday Inn Elkhart2 19264-7502 will need judges would like judge write call will send material study also need spon sors help cover expense meet wish help way please con tact Walt Schoonard 2080 Sharon Road Winter Park Florida 32789phone 305 647-1335 evenings next few articles will about Jet Ranger intended con struction articles rather improvements already fine machine However some things covered will have done during construction Tail-Rotor Drive Shaft Flutter Because tail-rotor flex shaft supported two places quite far apart tail-rotor drive shaft tends whip causes break use piece 3/16 ID aluminum tubing 20 inches long 21-in piece Kavan pushrod guide inside will extend either end aluminum tubing can epoxied will move tub ing can inserted through bulk heads 10 11 holes should enlarged shaft tubing will find its best alignment epoxied place sure sand alu minum tubing epoxied bulkheads aluminum tubing should extend 4/2 forward bulkhead 10 will permit drive shaft flex either end Horizontal Stabilizers stabilizers provided kit very difficult mount have parallel also get knocked off easily better way mount remove blind nuts bulkhead 11 epoxy 5-in piece 1/t music wire extended through side tail boom bulkhead 11 will necessary either ahead behind bulkhead Epoxy wire bulkhead fuselage equal portions extending either side Make sure wire 90 degrees main rotor shaft have already con structed stabilizers can cut opening under side paper tube 1 inches inner side Cut slot accept DuBro /8 wheel collar epoxy place set screw Continued page 91 June1977 23 Having covered modifications Heli-Baby Walt now turns Kavan Jet Ranger Above Fix trail-rotor drive shaft horizontal stabilizer mount adjustable fin Below Supports Former No 9 Former 9 screwed place note anti-rotation link awash plate cial awards such best finish realistic flight So drop Jerry card information Jerry Farr 2802 Robertson Dr Abilene TX 79606 Bud Atkinson 734 North 6th Street Terrace Blue Springs MO 64015 R C Helicopters/Schoonard continued page 23 facing down Drill out stabilizer inner former slide onto wire can now set angle stabilizer suit will notice very stable now wont get knocked off easily have constructed stabilizers much simpler build wheel collars Vertical Stabilizer kit shows stabilizer screwed place fine ex cept gets knocked off usually extensively damaged better way tach secure several strips servo tape will surprised firmly tape will hold gets knocked off seldom will dam aged will way come off flight Tail-Rotor Transmission Support Former 12 mounts tail-rotor transmission tail boom tends vibrate loose can cause serious crash problem former small has adequate gluing surface hold tail boom very good cure problem make new former -in plywood provides much greater gluing sur face will come loose mount tail-rotor transmission former -in 4 X 40 Allen bolts Speaking gluing Stabilt Epoxy provided kit fine material cures very rapidly wasted used fuselage made fiberglass nothing adheres fiberglass better fiberglass resin However resin thin runs will fill uneven spaces between formers fuselage use material called Fiber-Fill thickens resin paste consistency thick wish curing time can con trolled joint stronger fuselage use material secure formers transmission box will come loose crash interested Fiber-Fill write Ill tell can pur chased Fuselage Cabin Top As probably have noticed constructed per kit specs helicopter being lifted four thin corners cabin top Jet Rangers have crashed corners breaking off causing main-drive gear come unmeshed spur gear area ahead aluminum bearing box also wasted Jet Ranger can flown cabin top far safer FIRSTers Supersonic fuel wby Lew Mahieu well knolyer Ac quired 1950 byRSONIC rapidly becamethe current fuels ore winners NATS otherthAr fuel Today under single narB SLwas dropped back 1973 K&B Fstill themexopular best performing fuel K&Bs twenty-six year experience hae proved need various ts fuel Therefore offer widest range oflow fuels available. spe cifically formulated meet demands todays engines events geographical conditions K&B MODEL ENGINE FUEL X2C OIL K&B 100 Free Flight U-control R/O Flying K&B 500 R/O Flying & RIO Race carswhere both high low speeds required K&B 1000 Engines K&B SUPER SPEED going out K&B MODEL ENGINE FUEL CASTOR OIL K&B 100 Free Flight U-Control R/O Flying K&B 1000 1/2A Engines K&B FAI 80/20 Pylon Free Flight U-Control Speedno Nitro Qualifies FAI rules Select K&B Glow Fuel fulfill needs power model plane Choice Champions S SU% Ce tJSDLOSDRr NOESDRORD SD/lDDDRDSSPDDDESR N ISRIDRM 07 DLSDSLSSDSSDI cc*o/ ll5~ U IDDD0S TOLL RDIRLYALLOY V #9 servo-tray former best point lift helicopter hard ac complish Cut piece A-in plywood 1 wide 3 long epoxy un der former 9A against former 2A Cut two triangle pieces A-in plywood 1 QSODSSARDUDDDSD7 ROWDRDJODDSODS YRSN SDSSSDS SD 3 epoxy under rear corners former 9A Former 9 will now rest three points center lining former 9 points drill through #9 attaching point epoxy 4 X 40 blind Continued page 92 June 1977 91 REMAINING NEW FORD TRI MOTOR 1195 Unique because such amazing scale det~ kits relatively ~thing sor1 ways sueh- 0ur ~dging U thlflW see oUr neW chaflne wail another bOOtS oil yourclearly shown WIt . ruignly detailed Plastic Parts s uing touch realism-in-miniature NEW MESSERSCHMITT 495 ready bolt place-Complete control system less handle lines decals landing gear wheels etc makes building cinch assembly literally minutes can use 049 enpine ZERO Nifty control line models Theyre easiest ones world assembleall wood no tissue coveringonly 6 9 parts depending model ex cept Biplanes have few Genuine Nylon motor mount THEYRE AT YOUR DEALER GET OVER AND SEE THEM NOW . Continued page 91 nuts secure 4 X 40 AlIen bolts Now place cabin top place secure normal manner cabin top can now removed disturbing former 9 make needed adjustments ra dio receiver can mounted area ahead aluminum bearing box eliminates need servo extensions Next months column will cover external needle-valve extension glow-plug connectors landing-gear improvements head modifications have complaint about way end column intended smart remark rather word en couragement have yet see person fail learn fly put mind So word encouragement say youre flying its because trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Snake/Lambert continued page 26 life best HP has moving part impregnated Assembly Special care should taken installing ring distort bend Make sure boost transfer ports case liner match Always use new gaskets over tighten bolts Prop Bartel 8 X 8 Tornado type what use varying pitch engine good rule thumb use strokeprop relation stock cranks will vary up 010 stroke 728-730 67 pitch stroke 13T-734 7A7 pitch stroke 735-J37 78 pitch Fuel 55% nitro 25% methanol 15% MA 2270 5% castor oil ideal mix ture Good commercially available fuels Nitrotane Magnum Plugs Fireball Cool seal epoxied Gb-bee Flying takeoff slight down elevator leading plane should applied Caution should taken wind direc tionalways takoff down wind cross wind have questions please contact Address 718 Boston Ave South Day tona FL 32019 CL Racing/Lee continued page 29 Speed kilometers/hour3600/T Speed miles/hour 2237/T T formula above time seconds fly ten laps reason using speed can measure easily thing really counts Now person assumed out flying let us perform some ex periments determine relation tween speed technique easiest effects understand occur plane flying circular pathno yo-yo eg pulling arm suddenly reduce flying circle radius no wind pilot leading holding back airplane does continually just fraction lap handle airplane will both move circle steady rate short what called steady state opera tion established Under condi tions two kinds effects due changed flying radius tributable power added subtracted leading holding back plane discussion purposes say speed achieved flown FAT pylon standard Compared flying speed pylon plane flown according new Team Race rules center rotation handle plane line line length effectively creased Except tiny increase line drag true air speed will change speed based time per lap goes down because aircraft flies further 100 meters per lap pilots hand moves one-foot 3 meter radius cir cle example handle between airplane center rotation about 2% decrease timed speed see Fig 1 Table pilot gets way behind plane lines pass over left shoulder center rotation tween handle plane effect reversed see Fig 2 Most us thought latter position Herb Stocton flies Herb probably just setting up pass Note Fig 2 shortening radius means pilot must lean toward plane flies lines will come off left shoulder Increasing radius just reverses things Note net change 86 seconds time fly ten laps neither pilot whipping discussion above illustrated ap parent speed change changing fly ing radius whipping Before dis cussing general case two special cases will discussed two cases will maintaining same flying radius approximately changing speed leading lagging might call pure whipping case first shown Fig 4 natural flying pos ture beginners sport fliers sume being instructed pilot walks around circle lines perpendicular shoulders Fig 3 pilot walks backward might right after pass AMA competition legally its whippingWRL some stunt fliers between maneu vers get high maneuver entry speeds calculation example world-class racer speed lost 5 mi/hr Fig 4 Fig 3 speed gained 6 mi/hr reason gain loss 92 Model Aviation Nil EU SPAN 345 SCALE % IGER MOTH 1295 BEGINNERS
Edition: Model Aviation - 1977/06
Page Numbers: 23, 91, 92
S Helicopters EJ Wall Schoonard EVEN THOUGH helicopter rules have voted will 197879 Rule Book printing event itself will part regular Nationals until later Because fact large portion RC helicopter activity eastern part country has decided hold 1977 Helicopter Nationals South Bend Indiana June 10 11 12 will held three days Tn-Valley RC field 14154 Cleveland Road South Bend diana events will Novice Interme diate Expert Scale awards through three places plus Best ScratchBuilt helicopter reason adding third day expecting large entry will permit us run leisurely pace also will give time contestants get act gether South Bend area has plenty major motels good restaurants reservations call Holiday Inn South Bend219-272-6600 Howard Johnsons South219-272-1500 Ramada Inn South Bend219-272-5220 Ramada Inn Elk hart219-262-1581 8 Days Inn Elkhart 219-262-3541 Holiday Inn Elkhart2 19264-7502 will need judges would like judge write call will send material study also need spon sors help cover expense meet wish help way please con tact Walt Schoonard 2080 Sharon Road Winter Park Florida 32789phone 305 647-1335 evenings next few articles will about Jet Ranger intended con struction articles rather improvements already fine machine However some things covered will have done during construction Tail-Rotor Drive Shaft Flutter Because tail-rotor flex shaft supported two places quite far apart tail-rotor drive shaft tends whip causes break use piece 3/16 ID aluminum tubing 20 inches long 21-in piece Kavan pushrod guide inside will extend either end aluminum tubing can epoxied will move tub ing can inserted through bulk heads 10 11 holes should enlarged shaft tubing will find its best alignment epoxied place sure sand alu minum tubing epoxied bulkheads aluminum tubing should extend 4/2 forward bulkhead 10 will permit drive shaft flex either end Horizontal Stabilizers stabilizers provided kit very difficult mount have parallel also get knocked off easily better way mount remove blind nuts bulkhead 11 epoxy 5-in piece 1/t music wire extended through side tail boom bulkhead 11 will necessary either ahead behind bulkhead Epoxy wire bulkhead fuselage equal portions extending either side Make sure wire 90 degrees main rotor shaft have already con structed stabilizers can cut opening under side paper tube 1 inches inner side Cut slot accept DuBro /8 wheel collar epoxy place set screw Continued page 91 June1977 23 Having covered modifications Heli-Baby Walt now turns Kavan Jet Ranger Above Fix trail-rotor drive shaft horizontal stabilizer mount adjustable fin Below Supports Former No 9 Former 9 screwed place note anti-rotation link awash plate cial awards such best finish realistic flight So drop Jerry card information Jerry Farr 2802 Robertson Dr Abilene TX 79606 Bud Atkinson 734 North 6th Street Terrace Blue Springs MO 64015 R C Helicopters/Schoonard continued page 23 facing down Drill out stabilizer inner former slide onto wire can now set angle stabilizer suit will notice very stable now wont get knocked off easily have constructed stabilizers much simpler build wheel collars Vertical Stabilizer kit shows stabilizer screwed place fine ex cept gets knocked off usually extensively damaged better way tach secure several strips servo tape will surprised firmly tape will hold gets knocked off seldom will dam aged will way come off flight Tail-Rotor Transmission Support Former 12 mounts tail-rotor transmission tail boom tends vibrate loose can cause serious crash problem former small has adequate gluing surface hold tail boom very good cure problem make new former -in plywood provides much greater gluing sur face will come loose mount tail-rotor transmission former -in 4 X 40 Allen bolts Speaking gluing Stabilt Epoxy provided kit fine material cures very rapidly wasted used fuselage made fiberglass nothing adheres fiberglass better fiberglass resin However resin thin runs will fill uneven spaces between formers fuselage use material called Fiber-Fill thickens resin paste consistency thick wish curing time can con trolled joint stronger fuselage use material secure formers transmission box will come loose crash interested Fiber-Fill write Ill tell can pur chased Fuselage Cabin Top As probably have noticed constructed per kit specs helicopter being lifted four thin corners cabin top Jet Rangers have crashed corners breaking off causing main-drive gear come unmeshed spur gear area ahead aluminum bearing box also wasted Jet Ranger can flown cabin top far safer FIRSTers Supersonic fuel wby Lew Mahieu well knolyer Ac quired 1950 byRSONIC rapidly becamethe current fuels ore winners NATS otherthAr fuel Today under single narB SLwas dropped back 1973 K&B Fstill themexopular best performing fuel K&Bs twenty-six year experience hae proved need various ts fuel Therefore offer widest range oflow fuels available. spe cifically formulated meet demands todays engines events geographical conditions K&B MODEL ENGINE FUEL X2C OIL K&B 100 Free Flight U-control R/O Flying K&B 500 R/O Flying & RIO Race carswhere both high low speeds required K&B 1000 Engines K&B SUPER SPEED going out K&B MODEL ENGINE FUEL CASTOR OIL K&B 100 Free Flight U-Control R/O Flying K&B 1000 1/2A Engines K&B FAI 80/20 Pylon Free Flight U-Control Speedno Nitro Qualifies FAI rules Select K&B Glow Fuel fulfill needs power model plane Choice Champions S SU% Ce tJSDLOSDRr NOESDRORD SD/lDDDRDSSPDDDESR N ISRIDRM 07 DLSDSLSSDSSDI cc*o/ ll5~ U IDDD0S TOLL RDIRLYALLOY V #9 servo-tray former best point lift helicopter hard ac complish Cut piece A-in plywood 1 wide 3 long epoxy un der former 9A against former 2A Cut two triangle pieces A-in plywood 1 QSODSSARDUDDDSD7 ROWDRDJODDSODS YRSN SDSSSDS SD 3 epoxy under rear corners former 9A Former 9 will now rest three points center lining former 9 points drill through #9 attaching point epoxy 4 X 40 blind Continued page 92 June 1977 91 REMAINING NEW FORD TRI MOTOR 1195 Unique because such amazing scale det~ kits relatively ~thing sor1 ways sueh- 0ur ~dging U thlflW see oUr neW chaflne wail another bOOtS oil yourclearly shown WIt . ruignly detailed Plastic Parts s uing touch realism-in-miniature NEW MESSERSCHMITT 495 ready bolt place-Complete control system less handle lines decals landing gear wheels etc makes building cinch assembly literally minutes can use 049 enpine ZERO Nifty control line models Theyre easiest ones world assembleall wood no tissue coveringonly 6 9 parts depending model ex cept Biplanes have few Genuine Nylon motor mount THEYRE AT YOUR DEALER GET OVER AND SEE THEM NOW . Continued page 91 nuts secure 4 X 40 AlIen bolts Now place cabin top place secure normal manner cabin top can now removed disturbing former 9 make needed adjustments ra dio receiver can mounted area ahead aluminum bearing box eliminates need servo extensions Next months column will cover external needle-valve extension glow-plug connectors landing-gear improvements head modifications have complaint about way end column intended smart remark rather word en couragement have yet see person fail learn fly put mind So word encouragement say youre flying its because trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Snake/Lambert continued page 26 life best HP has moving part impregnated Assembly Special care should taken installing ring distort bend Make sure boost transfer ports case liner match Always use new gaskets over tighten bolts Prop Bartel 8 X 8 Tornado type what use varying pitch engine good rule thumb use strokeprop relation stock cranks will vary up 010 stroke 728-730 67 pitch stroke 13T-734 7A7 pitch stroke 735-J37 78 pitch Fuel 55% nitro 25% methanol 15% MA 2270 5% castor oil ideal mix ture Good commercially available fuels Nitrotane Magnum Plugs Fireball Cool seal epoxied Gb-bee Flying takeoff slight down elevator leading plane should applied Caution should taken wind direc tionalways takoff down wind cross wind have questions please contact Address 718 Boston Ave South Day tona FL 32019 CL Racing/Lee continued page 29 Speed kilometers/hour3600/T Speed miles/hour 2237/T T formula above time seconds fly ten laps reason using speed can measure easily thing really counts Now person assumed out flying let us perform some ex periments determine relation tween speed technique easiest effects understand occur plane flying circular pathno yo-yo eg pulling arm suddenly reduce flying circle radius no wind pilot leading holding back airplane does continually just fraction lap handle airplane will both move circle steady rate short what called steady state opera tion established Under condi tions two kinds effects due changed flying radius tributable power added subtracted leading holding back plane discussion purposes say speed achieved flown FAT pylon standard Compared flying speed pylon plane flown according new Team Race rules center rotation handle plane line line length effectively creased Except tiny increase line drag true air speed will change speed based time per lap goes down because aircraft flies further 100 meters per lap pilots hand moves one-foot 3 meter radius cir cle example handle between airplane center rotation about 2% decrease timed speed see Fig 1 Table pilot gets way behind plane lines pass over left shoulder center rotation tween handle plane effect reversed see Fig 2 Most us thought latter position Herb Stocton flies Herb probably just setting up pass Note Fig 2 shortening radius means pilot must lean toward plane flies lines will come off left shoulder Increasing radius just reverses things Note net change 86 seconds time fly ten laps neither pilot whipping discussion above illustrated ap parent speed change changing fly ing radius whipping Before dis cussing general case two special cases will discussed two cases will maintaining same flying radius approximately changing speed leading lagging might call pure whipping case first shown Fig 4 natural flying pos ture beginners sport fliers sume being instructed pilot walks around circle lines perpendicular shoulders Fig 3 pilot walks backward might right after pass AMA competition legally its whippingWRL some stunt fliers between maneu vers get high maneuver entry speeds calculation example world-class racer speed lost 5 mi/hr Fig 4 Fig 3 speed gained 6 mi/hr reason gain loss 92 Model Aviation Nil EU SPAN 345 SCALE % IGER MOTH 1295 BEGINNERS
Edition: Model Aviation - 1977/06
Page Numbers: 23, 91, 92
S Helicopters EJ Wall Schoonard EVEN THOUGH helicopter rules have voted will 197879 Rule Book printing event itself will part regular Nationals until later Because fact large portion RC helicopter activity eastern part country has decided hold 1977 Helicopter Nationals South Bend Indiana June 10 11 12 will held three days Tn-Valley RC field 14154 Cleveland Road South Bend diana events will Novice Interme diate Expert Scale awards through three places plus Best ScratchBuilt helicopter reason adding third day expecting large entry will permit us run leisurely pace also will give time contestants get act gether South Bend area has plenty major motels good restaurants reservations call Holiday Inn South Bend219-272-6600 Howard Johnsons South219-272-1500 Ramada Inn South Bend219-272-5220 Ramada Inn Elk hart219-262-1581 8 Days Inn Elkhart 219-262-3541 Holiday Inn Elkhart2 19264-7502 will need judges would like judge write call will send material study also need spon sors help cover expense meet wish help way please con tact Walt Schoonard 2080 Sharon Road Winter Park Florida 32789phone 305 647-1335 evenings next few articles will about Jet Ranger intended con struction articles rather improvements already fine machine However some things covered will have done during construction Tail-Rotor Drive Shaft Flutter Because tail-rotor flex shaft supported two places quite far apart tail-rotor drive shaft tends whip causes break use piece 3/16 ID aluminum tubing 20 inches long 21-in piece Kavan pushrod guide inside will extend either end aluminum tubing can epoxied will move tub ing can inserted through bulk heads 10 11 holes should enlarged shaft tubing will find its best alignment epoxied place sure sand alu minum tubing epoxied bulkheads aluminum tubing should extend 4/2 forward bulkhead 10 will permit drive shaft flex either end Horizontal Stabilizers stabilizers provided kit very difficult mount have parallel also get knocked off easily better way mount remove blind nuts bulkhead 11 epoxy 5-in piece 1/t music wire extended through side tail boom bulkhead 11 will necessary either ahead behind bulkhead Epoxy wire bulkhead fuselage equal portions extending either side Make sure wire 90 degrees main rotor shaft have already con structed stabilizers can cut opening under side paper tube 1 inches inner side Cut slot accept DuBro /8 wheel collar epoxy place set screw Continued page 91 June1977 23 Having covered modifications Heli-Baby Walt now turns Kavan Jet Ranger Above Fix trail-rotor drive shaft horizontal stabilizer mount adjustable fin Below Supports Former No 9 Former 9 screwed place note anti-rotation link awash plate cial awards such best finish realistic flight So drop Jerry card information Jerry Farr 2802 Robertson Dr Abilene TX 79606 Bud Atkinson 734 North 6th Street Terrace Blue Springs MO 64015 R C Helicopters/Schoonard continued page 23 facing down Drill out stabilizer inner former slide onto wire can now set angle stabilizer suit will notice very stable now wont get knocked off easily have constructed stabilizers much simpler build wheel collars Vertical Stabilizer kit shows stabilizer screwed place fine ex cept gets knocked off usually extensively damaged better way tach secure several strips servo tape will surprised firmly tape will hold gets knocked off seldom will dam aged will way come off flight Tail-Rotor Transmission Support Former 12 mounts tail-rotor transmission tail boom tends vibrate loose can cause serious crash problem former small has adequate gluing surface hold tail boom very good cure problem make new former -in plywood provides much greater gluing sur face will come loose mount tail-rotor transmission former -in 4 X 40 Allen bolts Speaking gluing Stabilt Epoxy provided kit fine material cures very rapidly wasted used fuselage made fiberglass nothing adheres fiberglass better fiberglass resin However resin thin runs will fill uneven spaces between formers fuselage use material called Fiber-Fill thickens resin paste consistency thick wish curing time can con trolled joint stronger fuselage use material secure formers transmission box will come loose crash interested Fiber-Fill write Ill tell can pur chased Fuselage Cabin Top As probably have noticed constructed per kit specs helicopter being lifted four thin corners cabin top Jet Rangers have crashed corners breaking off causing main-drive gear come unmeshed spur gear area ahead aluminum bearing box also wasted Jet Ranger can flown cabin top far safer FIRSTers Supersonic fuel wby Lew Mahieu well knolyer Ac quired 1950 byRSONIC rapidly becamethe current fuels ore winners NATS otherthAr fuel Today under single narB SLwas dropped back 1973 K&B Fstill themexopular best performing fuel K&Bs twenty-six year experience hae proved need various ts fuel Therefore offer widest range oflow fuels available. spe cifically formulated meet demands todays engines events geographical conditions K&B MODEL ENGINE FUEL X2C OIL K&B 100 Free Flight U-control R/O Flying K&B 500 R/O Flying & RIO Race carswhere both high low speeds required K&B 1000 Engines K&B SUPER SPEED going out K&B MODEL ENGINE FUEL CASTOR OIL K&B 100 Free Flight U-Control R/O Flying K&B 1000 1/2A Engines K&B FAI 80/20 Pylon Free Flight U-Control Speedno Nitro Qualifies FAI rules Select K&B Glow Fuel fulfill needs power model plane Choice Champions S SU% Ce tJSDLOSDRr NOESDRORD SD/lDDDRDSSPDDDESR N ISRIDRM 07 DLSDSLSSDSSDI cc*o/ ll5~ U IDDD0S TOLL RDIRLYALLOY V #9 servo-tray former best point lift helicopter hard ac complish Cut piece A-in plywood 1 wide 3 long epoxy un der former 9A against former 2A Cut two triangle pieces A-in plywood 1 QSODSSARDUDDDSD7 ROWDRDJODDSODS YRSN SDSSSDS SD 3 epoxy under rear corners former 9A Former 9 will now rest three points center lining former 9 points drill through #9 attaching point epoxy 4 X 40 blind Continued page 92 June 1977 91 REMAINING NEW FORD TRI MOTOR 1195 Unique because such amazing scale det~ kits relatively ~thing sor1 ways sueh- 0ur ~dging U thlflW see oUr neW chaflne wail another bOOtS oil yourclearly shown WIt . ruignly detailed Plastic Parts s uing touch realism-in-miniature NEW MESSERSCHMITT 495 ready bolt place-Complete control system less handle lines decals landing gear wheels etc makes building cinch assembly literally minutes can use 049 enpine ZERO Nifty control line models Theyre easiest ones world assembleall wood no tissue coveringonly 6 9 parts depending model ex cept Biplanes have few Genuine Nylon motor mount THEYRE AT YOUR DEALER GET OVER AND SEE THEM NOW . Continued page 91 nuts secure 4 X 40 AlIen bolts Now place cabin top place secure normal manner cabin top can now removed disturbing former 9 make needed adjustments ra dio receiver can mounted area ahead aluminum bearing box eliminates need servo extensions Next months column will cover external needle-valve extension glow-plug connectors landing-gear improvements head modifications have complaint about way end column intended smart remark rather word en couragement have yet see person fail learn fly put mind So word encouragement say youre flying its because trying hard enough Walt Schoonard 2080 Sharon Rd Winter Park FL 32789 Snake/Lambert continued page 26 life best HP has moving part impregnated Assembly Special care should taken installing ring distort bend Make sure boost transfer ports case liner match Always use new gaskets over tighten bolts Prop Bartel 8 X 8 Tornado type what use varying pitch engine good rule thumb use strokeprop relation stock cranks will vary up 010 stroke 728-730 67 pitch stroke 13T-734 7A7 pitch stroke 735-J37 78 pitch Fuel 55% nitro 25% methanol 15% MA 2270 5% castor oil ideal mix ture Good commercially available fuels Nitrotane Magnum Plugs Fireball Cool seal epoxied Gb-bee Flying takeoff slight down elevator leading plane should applied Caution should taken wind direc tionalways takoff down wind cross wind have questions please contact Address 718 Boston Ave South Day tona FL 32019 CL Racing/Lee continued page 29 Speed kilometers/hour3600/T Speed miles/hour 2237/T T formula above time seconds fly ten laps reason using speed can measure easily thing really counts Now person assumed out flying let us perform some ex periments determine relation tween speed technique easiest effects understand occur plane flying circular pathno yo-yo eg pulling arm suddenly reduce flying circle radius no wind pilot leading holding back airplane does continually just fraction lap handle airplane will both move circle steady rate short what called steady state opera tion established Under condi tions two kinds effects due changed flying radius tributable power added subtracted leading holding back plane discussion purposes say speed achieved flown FAT pylon standard Compared flying speed pylon plane flown according new Team Race rules center rotation handle plane line line length effectively creased Except tiny increase line drag true air speed will change speed based time per lap goes down because aircraft flies further 100 meters per lap pilots hand moves one-foot 3 meter radius cir cle example handle between airplane center rotation about 2% decrease timed speed see Fig 1 Table pilot gets way behind plane lines pass over left shoulder center rotation tween handle plane effect reversed see Fig 2 Most us thought latter position Herb Stocton flies Herb probably just setting up pass Note Fig 2 shortening radius means pilot must lean toward plane flies lines will come off left shoulder Increasing radius just reverses things Note net change 86 seconds time fly ten laps neither pilot whipping discussion above illustrated ap parent speed change changing fly ing radius whipping Before dis cussing general case two special cases will discussed two cases will maintaining same flying radius approximately changing speed leading lagging might call pure whipping case first shown Fig 4 natural flying pos ture beginners sport fliers sume being instructed pilot walks around circle lines perpendicular shoulders Fig 3 pilot walks backward might right after pass AMA competition legally its whippingWRL some stunt fliers between maneu vers get high maneuver entry speeds calculation example world-class racer speed lost 5 mi/hr Fig 4 Fig 3 speed gained 6 mi/hr reason gain loss 92 Model Aviation Nil EU SPAN 345 SCALE % IGER MOTH 1295 BEGINNERS