RAT RACING ultimate rac ing events achieve success must willing spend endless hours hard work person willing dedicate himself will rewarded success Rat has developed four men circle 90-mph airplanes two men 150-mph-plus airplanes fly beasts takes lot flying experience say practice cant learn fly few essential items good rat pilot must have Peripheral vision know other plane times spotting signals pit man also need fast reflexes split-second decisions speed traveling isnt time errors Top physi cal condition strong flying arm 140 laps 150 mph will whip pilots sometimes feels like will stretch arm about two inches have essentials pilot must have good flying airplane bad flying airplane will make best pilot look bad article designed go beyond previ ous article model design engine equipment Snake original design has shown superior flying characteristics speed strength neces sary consistent winning rat Before construction started must decide going use internal external leadouts round conventional bellcrank wash-out Internal connect ed lines realize about 2% decrease drag compared external leadouts about 3 4 mph increase round bellcrank much stronger smoother has travel decide use conven tional bellcrank see note plans Wash out rat allows plane land faster eliminating ballooning during pit-stops Construction have problems obtaining spe cial parts materials service required building flying aircraft following sources will helpful Rat Racing fly best article design go beyond anything previously published subject fiberglass top basswood other sup plies Arts Hobby Shop 10234 Atlantic Blvd Jacksonville FL 32211 engine rework other supplies Aldrich Prod ucts Inc PO Box 1426 Mission TX 78572 wing configuration cut piece 5/16 x 3 x 28 basswood Rout out bellcrank hole /8 deep wing weight pocket 3/16 deep button grooves Imbed 2 pieces /8 aluminum tubing leadouts bottom wing Turn wing over shape airfoil Use razor plane rough out tapering go careful over taper cut button grooves Finish shaping 100-grit sandpaper Drill holes mount wing skids bellcrank blind nuts Turn wing back over temporar ily mount bellcrank check freedom movement eliminate surface drag Remove bellcrank epoxy lead weight Sand wash-out shown plans flatten piece 3/16 brass tubing epoxy wing tip Rout out 030 deep pocket cover plate mount 3 2-56 blind nuts hold downs Epoxy wing fuselage fill rear 1 portion fuselage epoxy anchor rear hold-down tubing Logation wing 24 Model Aviation Dick Lambert K&B 65 fits nicely very little moditication Finishing includes two Coats Hobbypoxy Stuff over basswood two three coats Hobbypoxy clear over entire airplane Finish wet sanded rubbed Out compounded waxed Sanding details given text very critical 5 leading edge nose fuselage 2-15/16 engine center per plans Drill holes insert 5/32 brass tubing hold-down bolts front rear fuselage detailed plans front tubing should reinforced heavy fiberglass cloth blocks hardwood Grind shape front Harters Rat pan fit HP 40 RRV Mark drill tap 4-40 engine bolts also mark drill tap 6-32 hold down fuselage boltstwo front rear per plans method used mounting land ing gear tail skid somewhat different needed extra 6-32 die Cut about /2 threads two pieces /i X 6 piano wire Drill tap pan 6-32 tap per plan Screw both pieces wire tapped holes Bend rear wire touch forward leg wrap copper wire fill solder Cut length bend install 1 4 Dons wheel tail skid cut about ads /s X 1 /2 piano wire Drill vertically tap pan 6-32 tap caution must taken drill through pan Screw skid pan use Loctite tighten bend stabilizer made 3/16 piece basswood Mount crank horn shape air foil Drill hinge holes sew nylon hinges Shape piece hardwood key-way fit bottom pan epoxy bottom stabilizer See detail plans Drill 4 5/64 holes pan mount stabilizer 4 no 2 3/s~ wood screws Mounting stabilizer man ner avoids pan breaking hard landings fuel tank 4-oz Dons Rat tank extended 5 oz Mount tank pan silicone rubber cement base sides Drill hole pan just front tank fuel overflow drain vertical shut-off used instead horizontal because find faster definitely works better us Drill tap 2 4-40 holes mount shut-off apply tension bend wire mounts shut-off Mount engine cut openings fiber glass top head opening exhaust opening engine mount opening air intake air out let shut-off opening tank fill opening clearance around stabilizer Install bell crank pushrod kwik-link leadout wires hook up control system make sure works smoothly install buttons buttons made brass have tested 300 lbs isnt danger breaking lathe neces sary make buttons have local machine shop will make small fee Install buttons would eyelets wrapping leadouts copper wire soldering Install aluminum plate work controls back forth elevator Make certain isnt drag 0 18 control line ends Method used routing tubing through cut-off excess tubing used Internally connected lines realize about 2 percent drag decrease eliminate kinks Fuel tank 4-oz Dons Rat extended 5 compared external leadouts Yields speed increase 3 4 mph June 1977 25 Impreglon piston left stock piston right Impregnation actually penetrates metal authors HP engines 300 1000 rpm increase realized along longer engine life urouna plate artacnmern nola-aown boltnote cut-off trip wire Hot plate located other side fuselage shown plans brass button-type bellcuank turned lathe has tested 300 pounds Round bellcrank stronger smoother travel made up buttons found general section AMA Rule Book shut-off trip wire 018 braided wire small eyelet soldered end Connect other end pushrod 1 bellcrank wrapping copper wire soldering Place eyelet over cut off wire adjust correct length moving solder joint n pushrod back forth Fine adjustments shut-off made turning kwik-link out Finish Two coats Hobbypoxy Stuff applied basswood sanding 320-grit sandpaper between coats Finish sanding entire plane 360-grit sand paper Apply two three coats Hobby poxy color choice entire plane let dry Wet sand 500-grit sand paper rub out entire plane compound wax Install wing skids mount hot plate ground plate location being con venient pitman Engine HP 40 RRV chosen because its superior contest success past pres ent factors involved making engine run will try explain Front End front end should spin freely sign drag replace bearings use Class 5 bearings obtainable bearing supply stores bearings hard find times stock K&B bearings work just well Timing The intake exhaust timings stock have tried variations no improvement Liner Ring Remove liner heat ing case about 350-400 degrees Grip motor mount lug pliers tap out side top edge case against soft wood liner will slide out careful overheat distort case liner ideal way obtaining good ring take liner hobby shop owner will allow try several rings liner picking best fit have no way doing buy two three rings pick best first step picking good ring gently push ring together check ends making sure square Second take ring insert top liner using unringed piston push ring down liner Hold liner up bright light look light between liner wall ring see light ring round Third leave ring liner using feeler gauge check end gap 002 004 acceptable Head A double squishband high-com pression head good about 1000 rpm over stock head George Aldrich makes good head will fit engine small fee run 015 head clear ance Piston A good straight square pis ton hard find problem wrist pin hole milled crooked Check measuring top piston top wrist pin hole measurement should vary 001 002 Rod connecting rod should matched piston stroke crank shaft means engine bottom dead center top piston should flush bottom exhaust port Rods will vary length up 0 10 Optional Fluoropolymer metal impreg nation better known Teflon impregna tion best thing could have happened HP Impreglon #218 surface coating Actual penetration surface occurs during process Penetra tion 093 125 possible alu minum #218 provides superior protection friction reduction characteristics metal-to-metal frictional bearing surfaces What actually does HP increase rpm 300 1000 improve engine 26 Model Aviation 1st 2nd place 75 Eagle-Beagle Time 448 1st 3rd place 75 Rebel Rally Time 452 1st 4th place 75 National Time 435 1st 3rd place 75 KOl Time 434 1st 3rd place 76 Eagle-Beagle Time 446 1st 2nd place 76 Southeastern Championships Time 442 2nd place 76 Nationals Time 444 1st place 76 District 5 Championships Time 436 Harters Rat pan ground shaped fit HP 4ORRV single strut landing gear exceptionally strong Note landing gear wire skids attached wing leadout plate cover continued page 92 Harold Lambert left Dick Lambert Model has superior flight characteristics speed 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: 24, 25, 26, 92
RAT RACING ultimate rac ing events achieve success must willing spend endless hours hard work person willing dedicate himself will rewarded success Rat has developed four men circle 90-mph airplanes two men 150-mph-plus airplanes fly beasts takes lot flying experience say practice cant learn fly few essential items good rat pilot must have Peripheral vision know other plane times spotting signals pit man also need fast reflexes split-second decisions speed traveling isnt time errors Top physi cal condition strong flying arm 140 laps 150 mph will whip pilots sometimes feels like will stretch arm about two inches have essentials pilot must have good flying airplane bad flying airplane will make best pilot look bad article designed go beyond previ ous article model design engine equipment Snake original design has shown superior flying characteristics speed strength neces sary consistent winning rat Before construction started must decide going use internal external leadouts round conventional bellcrank wash-out Internal connect ed lines realize about 2% decrease drag compared external leadouts about 3 4 mph increase round bellcrank much stronger smoother has travel decide use conven tional bellcrank see note plans Wash out rat allows plane land faster eliminating ballooning during pit-stops Construction have problems obtaining spe cial parts materials service required building flying aircraft following sources will helpful Rat Racing fly best article design go beyond anything previously published subject fiberglass top basswood other sup plies Arts Hobby Shop 10234 Atlantic Blvd Jacksonville FL 32211 engine rework other supplies Aldrich Prod ucts Inc PO Box 1426 Mission TX 78572 wing configuration cut piece 5/16 x 3 x 28 basswood Rout out bellcrank hole /8 deep wing weight pocket 3/16 deep button grooves Imbed 2 pieces /8 aluminum tubing leadouts bottom wing Turn wing over shape airfoil Use razor plane rough out tapering go careful over taper cut button grooves Finish shaping 100-grit sandpaper Drill holes mount wing skids bellcrank blind nuts Turn wing back over temporar ily mount bellcrank check freedom movement eliminate surface drag Remove bellcrank epoxy lead weight Sand wash-out shown plans flatten piece 3/16 brass tubing epoxy wing tip Rout out 030 deep pocket cover plate mount 3 2-56 blind nuts hold downs Epoxy wing fuselage fill rear 1 portion fuselage epoxy anchor rear hold-down tubing Logation wing 24 Model Aviation Dick Lambert K&B 65 fits nicely very little moditication Finishing includes two Coats Hobbypoxy Stuff over basswood two three coats Hobbypoxy clear over entire airplane Finish wet sanded rubbed Out compounded waxed Sanding details given text very critical 5 leading edge nose fuselage 2-15/16 engine center per plans Drill holes insert 5/32 brass tubing hold-down bolts front rear fuselage detailed plans front tubing should reinforced heavy fiberglass cloth blocks hardwood Grind shape front Harters Rat pan fit HP 40 RRV Mark drill tap 4-40 engine bolts also mark drill tap 6-32 hold down fuselage boltstwo front rear per plans method used mounting land ing gear tail skid somewhat different needed extra 6-32 die Cut about /2 threads two pieces /i X 6 piano wire Drill tap pan 6-32 tap per plan Screw both pieces wire tapped holes Bend rear wire touch forward leg wrap copper wire fill solder Cut length bend install 1 4 Dons wheel tail skid cut about ads /s X 1 /2 piano wire Drill vertically tap pan 6-32 tap caution must taken drill through pan Screw skid pan use Loctite tighten bend stabilizer made 3/16 piece basswood Mount crank horn shape air foil Drill hinge holes sew nylon hinges Shape piece hardwood key-way fit bottom pan epoxy bottom stabilizer See detail plans Drill 4 5/64 holes pan mount stabilizer 4 no 2 3/s~ wood screws Mounting stabilizer man ner avoids pan breaking hard landings fuel tank 4-oz Dons Rat tank extended 5 oz Mount tank pan silicone rubber cement base sides Drill hole pan just front tank fuel overflow drain vertical shut-off used instead horizontal because find faster definitely works better us Drill tap 2 4-40 holes mount shut-off apply tension bend wire mounts shut-off Mount engine cut openings fiber glass top head opening exhaust opening engine mount opening air intake air out let shut-off opening tank fill opening clearance around stabilizer Install bell crank pushrod kwik-link leadout wires hook up control system make sure works smoothly install buttons buttons made brass have tested 300 lbs isnt danger breaking lathe neces sary make buttons have local machine shop will make small fee Install buttons would eyelets wrapping leadouts copper wire soldering Install aluminum plate work controls back forth elevator Make certain isnt drag 0 18 control line ends Method used routing tubing through cut-off excess tubing used Internally connected lines realize about 2 percent drag decrease eliminate kinks Fuel tank 4-oz Dons Rat extended 5 compared external leadouts Yields speed increase 3 4 mph June 1977 25 Impreglon piston left stock piston right Impregnation actually penetrates metal authors HP engines 300 1000 rpm increase realized along longer engine life urouna plate artacnmern nola-aown boltnote cut-off trip wire Hot plate located other side fuselage shown plans brass button-type bellcuank turned lathe has tested 300 pounds Round bellcrank stronger smoother travel made up buttons found general section AMA Rule Book shut-off trip wire 018 braided wire small eyelet soldered end Connect other end pushrod 1 bellcrank wrapping copper wire soldering Place eyelet over cut off wire adjust correct length moving solder joint n pushrod back forth Fine adjustments shut-off made turning kwik-link out Finish Two coats Hobbypoxy Stuff applied basswood sanding 320-grit sandpaper between coats Finish sanding entire plane 360-grit sand paper Apply two three coats Hobby poxy color choice entire plane let dry Wet sand 500-grit sand paper rub out entire plane compound wax Install wing skids mount hot plate ground plate location being con venient pitman Engine HP 40 RRV chosen because its superior contest success past pres ent factors involved making engine run will try explain Front End front end should spin freely sign drag replace bearings use Class 5 bearings obtainable bearing supply stores bearings hard find times stock K&B bearings work just well Timing The intake exhaust timings stock have tried variations no improvement Liner Ring Remove liner heat ing case about 350-400 degrees Grip motor mount lug pliers tap out side top edge case against soft wood liner will slide out careful overheat distort case liner ideal way obtaining good ring take liner hobby shop owner will allow try several rings liner picking best fit have no way doing buy two three rings pick best first step picking good ring gently push ring together check ends making sure square Second take ring insert top liner using unringed piston push ring down liner Hold liner up bright light look light between liner wall ring see light ring round Third leave ring liner using feeler gauge check end gap 002 004 acceptable Head A double squishband high-com pression head good about 1000 rpm over stock head George Aldrich makes good head will fit engine small fee run 015 head clear ance Piston A good straight square pis ton hard find problem wrist pin hole milled crooked Check measuring top piston top wrist pin hole measurement should vary 001 002 Rod connecting rod should matched piston stroke crank shaft means engine bottom dead center top piston should flush bottom exhaust port Rods will vary length up 0 10 Optional Fluoropolymer metal impreg nation better known Teflon impregna tion best thing could have happened HP Impreglon #218 surface coating Actual penetration surface occurs during process Penetra tion 093 125 possible alu minum #218 provides superior protection friction reduction characteristics metal-to-metal frictional bearing surfaces What actually does HP increase rpm 300 1000 improve engine 26 Model Aviation 1st 2nd place 75 Eagle-Beagle Time 448 1st 3rd place 75 Rebel Rally Time 452 1st 4th place 75 National Time 435 1st 3rd place 75 KOl Time 434 1st 3rd place 76 Eagle-Beagle Time 446 1st 2nd place 76 Southeastern Championships Time 442 2nd place 76 Nationals Time 444 1st place 76 District 5 Championships Time 436 Harters Rat pan ground shaped fit HP 4ORRV single strut landing gear exceptionally strong Note landing gear wire skids attached wing leadout plate cover continued page 92 Harold Lambert left Dick Lambert Model has superior flight characteristics speed 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: 24, 25, 26, 92
RAT RACING ultimate rac ing events achieve success must willing spend endless hours hard work person willing dedicate himself will rewarded success Rat has developed four men circle 90-mph airplanes two men 150-mph-plus airplanes fly beasts takes lot flying experience say practice cant learn fly few essential items good rat pilot must have Peripheral vision know other plane times spotting signals pit man also need fast reflexes split-second decisions speed traveling isnt time errors Top physi cal condition strong flying arm 140 laps 150 mph will whip pilots sometimes feels like will stretch arm about two inches have essentials pilot must have good flying airplane bad flying airplane will make best pilot look bad article designed go beyond previ ous article model design engine equipment Snake original design has shown superior flying characteristics speed strength neces sary consistent winning rat Before construction started must decide going use internal external leadouts round conventional bellcrank wash-out Internal connect ed lines realize about 2% decrease drag compared external leadouts about 3 4 mph increase round bellcrank much stronger smoother has travel decide use conven tional bellcrank see note plans Wash out rat allows plane land faster eliminating ballooning during pit-stops Construction have problems obtaining spe cial parts materials service required building flying aircraft following sources will helpful Rat Racing fly best article design go beyond anything previously published subject fiberglass top basswood other sup plies Arts Hobby Shop 10234 Atlantic Blvd Jacksonville FL 32211 engine rework other supplies Aldrich Prod ucts Inc PO Box 1426 Mission TX 78572 wing configuration cut piece 5/16 x 3 x 28 basswood Rout out bellcrank hole /8 deep wing weight pocket 3/16 deep button grooves Imbed 2 pieces /8 aluminum tubing leadouts bottom wing Turn wing over shape airfoil Use razor plane rough out tapering go careful over taper cut button grooves Finish shaping 100-grit sandpaper Drill holes mount wing skids bellcrank blind nuts Turn wing back over temporar ily mount bellcrank check freedom movement eliminate surface drag Remove bellcrank epoxy lead weight Sand wash-out shown plans flatten piece 3/16 brass tubing epoxy wing tip Rout out 030 deep pocket cover plate mount 3 2-56 blind nuts hold downs Epoxy wing fuselage fill rear 1 portion fuselage epoxy anchor rear hold-down tubing Logation wing 24 Model Aviation Dick Lambert K&B 65 fits nicely very little moditication Finishing includes two Coats Hobbypoxy Stuff over basswood two three coats Hobbypoxy clear over entire airplane Finish wet sanded rubbed Out compounded waxed Sanding details given text very critical 5 leading edge nose fuselage 2-15/16 engine center per plans Drill holes insert 5/32 brass tubing hold-down bolts front rear fuselage detailed plans front tubing should reinforced heavy fiberglass cloth blocks hardwood Grind shape front Harters Rat pan fit HP 40 RRV Mark drill tap 4-40 engine bolts also mark drill tap 6-32 hold down fuselage boltstwo front rear per plans method used mounting land ing gear tail skid somewhat different needed extra 6-32 die Cut about /2 threads two pieces /i X 6 piano wire Drill tap pan 6-32 tap per plan Screw both pieces wire tapped holes Bend rear wire touch forward leg wrap copper wire fill solder Cut length bend install 1 4 Dons wheel tail skid cut about ads /s X 1 /2 piano wire Drill vertically tap pan 6-32 tap caution must taken drill through pan Screw skid pan use Loctite tighten bend stabilizer made 3/16 piece basswood Mount crank horn shape air foil Drill hinge holes sew nylon hinges Shape piece hardwood key-way fit bottom pan epoxy bottom stabilizer See detail plans Drill 4 5/64 holes pan mount stabilizer 4 no 2 3/s~ wood screws Mounting stabilizer man ner avoids pan breaking hard landings fuel tank 4-oz Dons Rat tank extended 5 oz Mount tank pan silicone rubber cement base sides Drill hole pan just front tank fuel overflow drain vertical shut-off used instead horizontal because find faster definitely works better us Drill tap 2 4-40 holes mount shut-off apply tension bend wire mounts shut-off Mount engine cut openings fiber glass top head opening exhaust opening engine mount opening air intake air out let shut-off opening tank fill opening clearance around stabilizer Install bell crank pushrod kwik-link leadout wires hook up control system make sure works smoothly install buttons buttons made brass have tested 300 lbs isnt danger breaking lathe neces sary make buttons have local machine shop will make small fee Install buttons would eyelets wrapping leadouts copper wire soldering Install aluminum plate work controls back forth elevator Make certain isnt drag 0 18 control line ends Method used routing tubing through cut-off excess tubing used Internally connected lines realize about 2 percent drag decrease eliminate kinks Fuel tank 4-oz Dons Rat extended 5 compared external leadouts Yields speed increase 3 4 mph June 1977 25 Impreglon piston left stock piston right Impregnation actually penetrates metal authors HP engines 300 1000 rpm increase realized along longer engine life urouna plate artacnmern nola-aown boltnote cut-off trip wire Hot plate located other side fuselage shown plans brass button-type bellcuank turned lathe has tested 300 pounds Round bellcrank stronger smoother travel made up buttons found general section AMA Rule Book shut-off trip wire 018 braided wire small eyelet soldered end Connect other end pushrod 1 bellcrank wrapping copper wire soldering Place eyelet over cut off wire adjust correct length moving solder joint n pushrod back forth Fine adjustments shut-off made turning kwik-link out Finish Two coats Hobbypoxy Stuff applied basswood sanding 320-grit sandpaper between coats Finish sanding entire plane 360-grit sand paper Apply two three coats Hobby poxy color choice entire plane let dry Wet sand 500-grit sand paper rub out entire plane compound wax Install wing skids mount hot plate ground plate location being con venient pitman Engine HP 40 RRV chosen because its superior contest success past pres ent factors involved making engine run will try explain Front End front end should spin freely sign drag replace bearings use Class 5 bearings obtainable bearing supply stores bearings hard find times stock K&B bearings work just well Timing The intake exhaust timings stock have tried variations no improvement Liner Ring Remove liner heat ing case about 350-400 degrees Grip motor mount lug pliers tap out side top edge case against soft wood liner will slide out careful overheat distort case liner ideal way obtaining good ring take liner hobby shop owner will allow try several rings liner picking best fit have no way doing buy two three rings pick best first step picking good ring gently push ring together check ends making sure square Second take ring insert top liner using unringed piston push ring down liner Hold liner up bright light look light between liner wall ring see light ring round Third leave ring liner using feeler gauge check end gap 002 004 acceptable Head A double squishband high-com pression head good about 1000 rpm over stock head George Aldrich makes good head will fit engine small fee run 015 head clear ance Piston A good straight square pis ton hard find problem wrist pin hole milled crooked Check measuring top piston top wrist pin hole measurement should vary 001 002 Rod connecting rod should matched piston stroke crank shaft means engine bottom dead center top piston should flush bottom exhaust port Rods will vary length up 0 10 Optional Fluoropolymer metal impreg nation better known Teflon impregna tion best thing could have happened HP Impreglon #218 surface coating Actual penetration surface occurs during process Penetra tion 093 125 possible alu minum #218 provides superior protection friction reduction characteristics metal-to-metal frictional bearing surfaces What actually does HP increase rpm 300 1000 improve engine 26 Model Aviation 1st 2nd place 75 Eagle-Beagle Time 448 1st 3rd place 75 Rebel Rally Time 452 1st 4th place 75 National Time 435 1st 3rd place 75 KOl Time 434 1st 3rd place 76 Eagle-Beagle Time 446 1st 2nd place 76 Southeastern Championships Time 442 2nd place 76 Nationals Time 444 1st place 76 District 5 Championships Time 436 Harters Rat pan ground shaped fit HP 4ORRV single strut landing gear exceptionally strong Note landing gear wire skids attached wing leadout plate cover continued page 92 Harold Lambert left Dick Lambert Model has superior flight characteristics speed 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: 24, 25, 26, 92
RAT RACING ultimate rac ing events achieve success must willing spend endless hours hard work person willing dedicate himself will rewarded success Rat has developed four men circle 90-mph airplanes two men 150-mph-plus airplanes fly beasts takes lot flying experience say practice cant learn fly few essential items good rat pilot must have Peripheral vision know other plane times spotting signals pit man also need fast reflexes split-second decisions speed traveling isnt time errors Top physi cal condition strong flying arm 140 laps 150 mph will whip pilots sometimes feels like will stretch arm about two inches have essentials pilot must have good flying airplane bad flying airplane will make best pilot look bad article designed go beyond previ ous article model design engine equipment Snake original design has shown superior flying characteristics speed strength neces sary consistent winning rat Before construction started must decide going use internal external leadouts round conventional bellcrank wash-out Internal connect ed lines realize about 2% decrease drag compared external leadouts about 3 4 mph increase round bellcrank much stronger smoother has travel decide use conven tional bellcrank see note plans Wash out rat allows plane land faster eliminating ballooning during pit-stops Construction have problems obtaining spe cial parts materials service required building flying aircraft following sources will helpful Rat Racing fly best article design go beyond anything previously published subject fiberglass top basswood other sup plies Arts Hobby Shop 10234 Atlantic Blvd Jacksonville FL 32211 engine rework other supplies Aldrich Prod ucts Inc PO Box 1426 Mission TX 78572 wing configuration cut piece 5/16 x 3 x 28 basswood Rout out bellcrank hole /8 deep wing weight pocket 3/16 deep button grooves Imbed 2 pieces /8 aluminum tubing leadouts bottom wing Turn wing over shape airfoil Use razor plane rough out tapering go careful over taper cut button grooves Finish shaping 100-grit sandpaper Drill holes mount wing skids bellcrank blind nuts Turn wing back over temporar ily mount bellcrank check freedom movement eliminate surface drag Remove bellcrank epoxy lead weight Sand wash-out shown plans flatten piece 3/16 brass tubing epoxy wing tip Rout out 030 deep pocket cover plate mount 3 2-56 blind nuts hold downs Epoxy wing fuselage fill rear 1 portion fuselage epoxy anchor rear hold-down tubing Logation wing 24 Model Aviation Dick Lambert K&B 65 fits nicely very little moditication Finishing includes two Coats Hobbypoxy Stuff over basswood two three coats Hobbypoxy clear over entire airplane Finish wet sanded rubbed Out compounded waxed Sanding details given text very critical 5 leading edge nose fuselage 2-15/16 engine center per plans Drill holes insert 5/32 brass tubing hold-down bolts front rear fuselage detailed plans front tubing should reinforced heavy fiberglass cloth blocks hardwood Grind shape front Harters Rat pan fit HP 40 RRV Mark drill tap 4-40 engine bolts also mark drill tap 6-32 hold down fuselage boltstwo front rear per plans method used mounting land ing gear tail skid somewhat different needed extra 6-32 die Cut about /2 threads two pieces /i X 6 piano wire Drill tap pan 6-32 tap per plan Screw both pieces wire tapped holes Bend rear wire touch forward leg wrap copper wire fill solder Cut length bend install 1 4 Dons wheel tail skid cut about ads /s X 1 /2 piano wire Drill vertically tap pan 6-32 tap caution must taken drill through pan Screw skid pan use Loctite tighten bend stabilizer made 3/16 piece basswood Mount crank horn shape air foil Drill hinge holes sew nylon hinges Shape piece hardwood key-way fit bottom pan epoxy bottom stabilizer See detail plans Drill 4 5/64 holes pan mount stabilizer 4 no 2 3/s~ wood screws Mounting stabilizer man ner avoids pan breaking hard landings fuel tank 4-oz Dons Rat tank extended 5 oz Mount tank pan silicone rubber cement base sides Drill hole pan just front tank fuel overflow drain vertical shut-off used instead horizontal because find faster definitely works better us Drill tap 2 4-40 holes mount shut-off apply tension bend wire mounts shut-off Mount engine cut openings fiber glass top head opening exhaust opening engine mount opening air intake air out let shut-off opening tank fill opening clearance around stabilizer Install bell crank pushrod kwik-link leadout wires hook up control system make sure works smoothly install buttons buttons made brass have tested 300 lbs isnt danger breaking lathe neces sary make buttons have local machine shop will make small fee Install buttons would eyelets wrapping leadouts copper wire soldering Install aluminum plate work controls back forth elevator Make certain isnt drag 0 18 control line ends Method used routing tubing through cut-off excess tubing used Internally connected lines realize about 2 percent drag decrease eliminate kinks Fuel tank 4-oz Dons Rat extended 5 compared external leadouts Yields speed increase 3 4 mph June 1977 25 Impreglon piston left stock piston right Impregnation actually penetrates metal authors HP engines 300 1000 rpm increase realized along longer engine life urouna plate artacnmern nola-aown boltnote cut-off trip wire Hot plate located other side fuselage shown plans brass button-type bellcuank turned lathe has tested 300 pounds Round bellcrank stronger smoother travel made up buttons found general section AMA Rule Book shut-off trip wire 018 braided wire small eyelet soldered end Connect other end pushrod 1 bellcrank wrapping copper wire soldering Place eyelet over cut off wire adjust correct length moving solder joint n pushrod back forth Fine adjustments shut-off made turning kwik-link out Finish Two coats Hobbypoxy Stuff applied basswood sanding 320-grit sandpaper between coats Finish sanding entire plane 360-grit sand paper Apply two three coats Hobby poxy color choice entire plane let dry Wet sand 500-grit sand paper rub out entire plane compound wax Install wing skids mount hot plate ground plate location being con venient pitman Engine HP 40 RRV chosen because its superior contest success past pres ent factors involved making engine run will try explain Front End front end should spin freely sign drag replace bearings use Class 5 bearings obtainable bearing supply stores bearings hard find times stock K&B bearings work just well Timing The intake exhaust timings stock have tried variations no improvement Liner Ring Remove liner heat ing case about 350-400 degrees Grip motor mount lug pliers tap out side top edge case against soft wood liner will slide out careful overheat distort case liner ideal way obtaining good ring take liner hobby shop owner will allow try several rings liner picking best fit have no way doing buy two three rings pick best first step picking good ring gently push ring together check ends making sure square Second take ring insert top liner using unringed piston push ring down liner Hold liner up bright light look light between liner wall ring see light ring round Third leave ring liner using feeler gauge check end gap 002 004 acceptable Head A double squishband high-com pression head good about 1000 rpm over stock head George Aldrich makes good head will fit engine small fee run 015 head clear ance Piston A good straight square pis ton hard find problem wrist pin hole milled crooked Check measuring top piston top wrist pin hole measurement should vary 001 002 Rod connecting rod should matched piston stroke crank shaft means engine bottom dead center top piston should flush bottom exhaust port Rods will vary length up 0 10 Optional Fluoropolymer metal impreg nation better known Teflon impregna tion best thing could have happened HP Impreglon #218 surface coating Actual penetration surface occurs during process Penetra tion 093 125 possible alu minum #218 provides superior protection friction reduction characteristics metal-to-metal frictional bearing surfaces What actually does HP increase rpm 300 1000 improve engine 26 Model Aviation 1st 2nd place 75 Eagle-Beagle Time 448 1st 3rd place 75 Rebel Rally Time 452 1st 4th place 75 National Time 435 1st 3rd place 75 KOl Time 434 1st 3rd place 76 Eagle-Beagle Time 446 1st 2nd place 76 Southeastern Championships Time 442 2nd place 76 Nationals Time 444 1st place 76 District 5 Championships Time 436 Harters Rat pan ground shaped fit HP 4ORRV single strut landing gear exceptionally strong Note landing gear wire skids attached wing leadout plate cover continued page 92 Harold Lambert left Dick Lambert Model has superior flight characteristics speed 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