LITTLE QUICKIE construction have nu merous requests information visual aids relating construction Scale Racers majority Midwestern events Scale Rac ing profits largest entry level Larry Dziak has shared some proven construction techniques will share photos shows prirnasy construc tion %-in-thick fuselage Things note extremely large motor mounts 34 x % bottom mount extending hack beyond wing giving fuselage extra strength avoid having tail break off during hard landings Larry puts two spruce spars fuse lage directly under wing can see right over lower hardwood mount runs way either side elevator mount Larry lightens hard wood drilling holes strength maintamed additional weight removed can also note tank-mounting recess right below wing tank can securely attached hardwood mount recessed under balsa top sheeting Wing construction falrly straightforward Larry uses flat-bottomed wing made / balsa A6 hardwood spar mounting plate bellerank addition Larry uses 3R-in-sq spruce leading edge piece / plywood tralling edge stiffness way after top wing skin glued can sand trailing edge sharp line juneContinued page 168 Bill Bischoffs hot thumb made Cox Y2A glow plug clip Engine Kus torn Kraftsmanship Note left-hand Tornado prop fast-fill button fuel tank Photo Eric Tomchik September 1988 77 Control Line Racing John Ballard 10102 lUmb4ewkk Dr Louisville KY 40223 two studies some Southern California fliers used discuss piloting techniques Johns column fliers LL R John McCollum Dave Braun Jim Lueken rest RL R Paul Gibeault Bob Kerr barely visible Howard Shahan Heres Larry Dziak builds strong Scale Racer Photo top shows profile fuselages hardwood inserts lightening holes Im mediately below assembled plane showing entire front fuelage TE wing reinforced thin plywood cover plywood fin cut out buried elevator pushrod runs through aluminum tube rear Wing structure R has buried belicrank thin plywood TE strip hardwood spars Wing skins balsa Ribs thick balsaand lots epoxy holds togetherl info column balance combination construction em phasize accurate alignments good technique control system installation An excellent example good design practice Pink Lady Formula 40 presented De cember 1987 issue Model Aviation Full-Size Plan No 573$4 Engine selection preparation real heart competition setup Current Speed en gines competitive basic design days Speed secret long past secrets making strong engine 1 Freerunning crankshaft good bearings 2 Prop erly fitted piston sleeve 3 Good cylinder head fit 4 Accurately fitted free-running disk rotor rear-intake engines basics right engine fed right amount fuel will make competi tive amount power equipment pro cesses check andif necessarycorrect items beyond scope article several individuals business en gine tuning will set up engine have found engines generally pretty close being right come out box services engine specialists needed rebuild time comes list commonly used Speed en gines includes A/FAI Speed OPS 15 Rossi 15 Mk Ill K&B/Cox 15 Conquest Supertigre X-l5 RI cur rent AMA class record-holder B Speed OPS 29 Supertigre X-29 current AMA class record-holder K&B 49 RI D Speed 05 65 VR DF current AMA class record-holder K&B 65 OPS 65 Ducted Fan Picco 65 Ducted Fan Rossi 65 Ducted Fan F-40 Speed OS 40 VR-P K&B 65 Picco 40 RI/RE Supertigre X-40 RI current AMA class record-holder Jet Speed Dyna-Jet current AMA class record-holder fuel engines no se crets piston engines three basic ingredi ents methanol nitromethane oil Jets two basics nitromethane propy lene oxide Typical fuel formulas given low Break-in/test/F-40 40% methanol 40% nitromethane 20% oil 10% synthetic plus 10% castor Contest piped engines classes B 15% methanol 65% nitromethane 20% oil 17% synthetic plus 3% castor Contest class D 0%-5% methanol 75%80% nitromethane 20% oil 17% synthetic plus 3% castor Jet 50% nitromethane 50% propylene oxide recommend using less 20% oil piston engines possible run less smallest mistake setting needle too lean will likely result damaged en gine also really like use castor oil com bination synthetic pil produces sig nificant extra protection primarily connect ing rod/crankpin bearing preceding discussion have skipped over Jets mostly because basics bit dif ferent essentially engine use Dyna-Jet stock form has re mained essentially unchanged since 1948 HoW ever engine/event Speed secret alive well Jet preferred class suggest follow trainer route recip-engine classes using Phire Phart published column August 1986 issue trainer trainer use stock engine fuel mix 80% methanol 20% methyl ethyl ke tone MEK After can fly pylon etc start experimenting high-lift valve re tainers nitromethane/propylene oxide fuel stock Dyna-Jet nitro/propylene using re tainer 06 over stock will run about 170 mph want go really fast Jet best information have found Super Burp con struction article December 1978 Model Avi ation final observation best investment can make starting Speed join North American Speed Society publishes quarterly newsletter Speed Times ab solute gold information model design engine setup parts/hardware supply sources Membership Open members $20/year address North American Speed Society Box 82294 North Bumaby BC Canada V5C 5P7 thanks Bill Nusz taking time spending effort necessary give us very enlightening observations Have funfly Speed ternfic how-to description steps take setting up stock engine top performance Bill Hagers RC Pylon Racing column month Although addresses Sport Pylon Racing information perfectly good CL Speed too RMcM CL Racing/Ballard Continued page 77 ture / plywood will note bellcrank off center pushrod coming down centerline winga necessity internally mounted elevator controls PRODUCTS FOR THE DI$CERNNG MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers * Specialized Exhaust Systems Unsurpassed Wn C Another photos shows wing mounted fuselage /16 plywood applied over entire frontal section back almost rear wing addition can see pushrod passing through fuselage enclosed alu mmum tube elevator horn attached right below stab Half-A glow plug clip have shown ex cellent hot thumb can made very quickly inexpensively addition brass strip soldered typical Cox VzA glow plug clip addition washer soldered bottom added brass strip aid provid ing positive location plugs center post particular unit can also used Scale Rac ing addition Mouse Performance results have just received some Racing time results recent meet Califor nia show Scale Race times 557 10 first-placer Mike Shahan 61184 secondplace Bill Lee Rat Race saw spectacular 43092 win 50513 second place both being Shahan-Fogg entries AMA Slow Rat showed Fox/Repp team winning 81020 Bill Lee second 81778 John MeCollum also included West Coasts recent Sebree Hayes Memorial AAA Meet Scale Racing won Vic Gamer time 61350 Mike Shahan second 62190 Rat Race won Bob Fogg 44684 Howard Shahan came next 45060 Slow Rat some sparkling times led Vie Garner 60863 Fox/Repp team 63560 Good piloting techniques am enclosing two photographs recent California contest lot three-up flying photo shows three pilots John McCollum ready pass Dave Brown Note John has come up behind him starting ralse fly ing hand up get clear Daves head smaller pilots essence trapped hind taller pilots hand extremely low As comes up behind taller pilot should ralse flying hand up near bead bring alrcraft over minimum amount speed loss smooth pass other photo shows three pilots pi lot left actually blocking other two Bob Kerr wearing Livermore Flyer shirt way behind planenote over left However hand behind Howard Sha han should up over top head plane will catch up properly manmum time alrspeed loss arm position shown actually slowing drag168 Model Aviation TWINS ARE CLASSIC AND AFFORDABLE Looking inexpensive opposed twin replace shaking smelly gas burner want scale like appearance smooth running 2 cycle glow operation Yes its back basics EHS Tradings Twin Star Comments .Have lot engiwe no doubt ably best. Bd Thomas Lake Havasu AZ .The Twin Star ism esceptionaly smooth engne thu displacement size. Clarance Lee ENGINE EDITOR RCM MAGAZINE answer question often ked- muffler available Yes muffler & header available CALL FOR INFORMAllON EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII %720 1 -800-63HOBBV 808 935-9009 HA WAIl STD TIME 10 AM7PM Mon-S 00 Without Muffler ging plane down walking larger circle adds unneeded tenths second time Charging GloBee Fire Plug have sev eral requests concerning proper charging time battery system find gel cell bat tesy included unit should charged min imum overnight 15 hours prior contest use always carry additional freshly charged battery practice morning various events can insert freshly charged cell afternoons performance have seen competitors using battery day long adverse problems just worth taking chance Unfortunately gel cell batteries start run down will hold full charge few seconds battery will drop off glow plug second two will diminished engine starts first flip okay however have keep battery connected length time reduced amperage will result hard starting engine Also thought might mention use piece styrofoam stuck over battery posts held place healthy wrap electrical tape around battery assures bat tery contacts short out touching piece metal oould potential fire hazard occurred have also seen rheostat GloBec bat tery turned up too high Rat Scale Race en gines sometimes engines will just sit prop rocking back forth after being flippedan indication too-hot glow plug burning fuel away piston mak ing flip-starts virtually impossible rheostat must adjusted contacts touch airplane glow plug has very faint glow will give decent combustion range quick restarting As always comments photos solic ited appreciated Mini-Electrics/SruII Continued page 92 power Has ever happened spite having worked hard keep weight minimum adding lastminute details putting really nice finish often brings flying weight Mini-Electric little higher intended model youre building neat kit set great plans turns out just little bit larger size recommended Mini-Electric power sun dry reasons sometimes find power available quite sufficient get hoped-for flying performance some simple things can coax lit tle power endurance Mini-Electric systemand some things should try First make sure flight battery cells OKnot vented cooked leak ing Damaged ones will need replaced Second make sure propeller ap propriate size pitch Above dont go larger higher-pitch prop obtain power Such prop likely give less thrnst worse can overheat possibly damage motor Remember slow motor down larger prop higher current converse also holds highest threshold current want little mo tors operate about 21/2 2 3A amps under 3 amps Sure going above levels short periods 31/2 4 amps wont pose immediate risk cooking motor battery general sport flying decent longev ity motors stay 3 amps below maximum recommended current re fers current drawn operating ground bench test so-called static load air prop will unload little will speed up causing current drop about 14 amp have access test meter can measure up 5 amps current fine tuning little electric mo tors finding right prop safe max imum power becomes very easy Otherwise stick recommended prop size Third make sure motor bearings free tiny drop oil helps gear mesh between pinion spur gears free binding little loose side much better tight fit least bit binding will render MiniElectric gutless blob motor has plastic pinion make sure cracked slightest hairline crack often dif ficult detect will distort under load sap tremendous amount power Since can assume have overcome charging problems building recoinContinued page 172 Print carefully shipping label UU 0 1975 July first issue 01976 0197701982 0197801983 01979sold89840 1980Out-9*9860198101986 Enclose aseparate $2200 check set ordered NO CASHNO CHARGES rI IU IU II II Name II Street Address II cityState ZIP Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr L on VA 22090 September 1988 169 40 CC/24 CU IN AMA CENrE5FO5 Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashedf Limited Quantities Sets Are Complete
Edition: Model Aviation - 1988/09
Page Numbers: 77, 168, 169
LITTLE QUICKIE construction have nu merous requests information visual aids relating construction Scale Racers majority Midwestern events Scale Rac ing profits largest entry level Larry Dziak has shared some proven construction techniques will share photos shows prirnasy construc tion %-in-thick fuselage Things note extremely large motor mounts 34 x % bottom mount extending hack beyond wing giving fuselage extra strength avoid having tail break off during hard landings Larry puts two spruce spars fuse lage directly under wing can see right over lower hardwood mount runs way either side elevator mount Larry lightens hard wood drilling holes strength maintamed additional weight removed can also note tank-mounting recess right below wing tank can securely attached hardwood mount recessed under balsa top sheeting Wing construction falrly straightforward Larry uses flat-bottomed wing made / balsa A6 hardwood spar mounting plate bellerank addition Larry uses 3R-in-sq spruce leading edge piece / plywood tralling edge stiffness way after top wing skin glued can sand trailing edge sharp line juneContinued page 168 Bill Bischoffs hot thumb made Cox Y2A glow plug clip Engine Kus torn Kraftsmanship Note left-hand Tornado prop fast-fill button fuel tank Photo Eric Tomchik September 1988 77 Control Line Racing John Ballard 10102 lUmb4ewkk Dr Louisville KY 40223 two studies some Southern California fliers used discuss piloting techniques Johns column fliers LL R John McCollum Dave Braun Jim Lueken rest RL R Paul Gibeault Bob Kerr barely visible Howard Shahan Heres Larry Dziak builds strong Scale Racer Photo top shows profile fuselages hardwood inserts lightening holes Im mediately below assembled plane showing entire front fuelage TE wing reinforced thin plywood cover plywood fin cut out buried elevator pushrod runs through aluminum tube rear Wing structure R has buried belicrank thin plywood TE strip hardwood spars Wing skins balsa Ribs thick balsaand lots epoxy holds togetherl info column balance combination construction em phasize accurate alignments good technique control system installation An excellent example good design practice Pink Lady Formula 40 presented De cember 1987 issue Model Aviation Full-Size Plan No 573$4 Engine selection preparation real heart competition setup Current Speed en gines competitive basic design days Speed secret long past secrets making strong engine 1 Freerunning crankshaft good bearings 2 Prop erly fitted piston sleeve 3 Good cylinder head fit 4 Accurately fitted free-running disk rotor rear-intake engines basics right engine fed right amount fuel will make competi tive amount power equipment pro cesses check andif necessarycorrect items beyond scope article several individuals business en gine tuning will set up engine have found engines generally pretty close being right come out box services engine specialists needed rebuild time comes list commonly used Speed en gines includes A/FAI Speed OPS 15 Rossi 15 Mk Ill K&B/Cox 15 Conquest Supertigre X-l5 RI cur rent AMA class record-holder B Speed OPS 29 Supertigre X-29 current AMA class record-holder K&B 49 RI D Speed 05 65 VR DF current AMA class record-holder K&B 65 OPS 65 Ducted Fan Picco 65 Ducted Fan Rossi 65 Ducted Fan F-40 Speed OS 40 VR-P K&B 65 Picco 40 RI/RE Supertigre X-40 RI current AMA class record-holder Jet Speed Dyna-Jet current AMA class record-holder fuel engines no se crets piston engines three basic ingredi ents methanol nitromethane oil Jets two basics nitromethane propy lene oxide Typical fuel formulas given low Break-in/test/F-40 40% methanol 40% nitromethane 20% oil 10% synthetic plus 10% castor Contest piped engines classes B 15% methanol 65% nitromethane 20% oil 17% synthetic plus 3% castor Contest class D 0%-5% methanol 75%80% nitromethane 20% oil 17% synthetic plus 3% castor Jet 50% nitromethane 50% propylene oxide recommend using less 20% oil piston engines possible run less smallest mistake setting needle too lean will likely result damaged en gine also really like use castor oil com bination synthetic pil produces sig nificant extra protection primarily connect ing rod/crankpin bearing preceding discussion have skipped over Jets mostly because basics bit dif ferent essentially engine use Dyna-Jet stock form has re mained essentially unchanged since 1948 HoW ever engine/event Speed secret alive well Jet preferred class suggest follow trainer route recip-engine classes using Phire Phart published column August 1986 issue trainer trainer use stock engine fuel mix 80% methanol 20% methyl ethyl ke tone MEK After can fly pylon etc start experimenting high-lift valve re tainers nitromethane/propylene oxide fuel stock Dyna-Jet nitro/propylene using re tainer 06 over stock will run about 170 mph want go really fast Jet best information have found Super Burp con struction article December 1978 Model Avi ation final observation best investment can make starting Speed join North American Speed Society publishes quarterly newsletter Speed Times ab solute gold information model design engine setup parts/hardware supply sources Membership Open members $20/year address North American Speed Society Box 82294 North Bumaby BC Canada V5C 5P7 thanks Bill Nusz taking time spending effort necessary give us very enlightening observations Have funfly Speed ternfic how-to description steps take setting up stock engine top performance Bill Hagers RC Pylon Racing column month Although addresses Sport Pylon Racing information perfectly good CL Speed too RMcM CL Racing/Ballard Continued page 77 ture / plywood will note bellcrank off center pushrod coming down centerline winga necessity internally mounted elevator controls PRODUCTS FOR THE DI$CERNNG MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers * Specialized Exhaust Systems Unsurpassed Wn C Another photos shows wing mounted fuselage /16 plywood applied over entire frontal section back almost rear wing addition can see pushrod passing through fuselage enclosed alu mmum tube elevator horn attached right below stab Half-A glow plug clip have shown ex cellent hot thumb can made very quickly inexpensively addition brass strip soldered typical Cox VzA glow plug clip addition washer soldered bottom added brass strip aid provid ing positive location plugs center post particular unit can also used Scale Rac ing addition Mouse Performance results have just received some Racing time results recent meet Califor nia show Scale Race times 557 10 first-placer Mike Shahan 61184 secondplace Bill Lee Rat Race saw spectacular 43092 win 50513 second place both being Shahan-Fogg entries AMA Slow Rat showed Fox/Repp team winning 81020 Bill Lee second 81778 John MeCollum also included West Coasts recent Sebree Hayes Memorial AAA Meet Scale Racing won Vic Gamer time 61350 Mike Shahan second 62190 Rat Race won Bob Fogg 44684 Howard Shahan came next 45060 Slow Rat some sparkling times led Vie Garner 60863 Fox/Repp team 63560 Good piloting techniques am enclosing two photographs recent California contest lot three-up flying photo shows three pilots John McCollum ready pass Dave Brown Note John has come up behind him starting ralse fly ing hand up get clear Daves head smaller pilots essence trapped hind taller pilots hand extremely low As comes up behind taller pilot should ralse flying hand up near bead bring alrcraft over minimum amount speed loss smooth pass other photo shows three pilots pi lot left actually blocking other two Bob Kerr wearing Livermore Flyer shirt way behind planenote over left However hand behind Howard Sha han should up over top head plane will catch up properly manmum time alrspeed loss arm position shown actually slowing drag168 Model Aviation TWINS ARE CLASSIC AND AFFORDABLE Looking inexpensive opposed twin replace shaking smelly gas burner want scale like appearance smooth running 2 cycle glow operation Yes its back basics EHS Tradings Twin Star Comments .Have lot engiwe no doubt ably best. Bd Thomas Lake Havasu AZ .The Twin Star ism esceptionaly smooth engne thu displacement size. Clarance Lee ENGINE EDITOR RCM MAGAZINE answer question often ked- muffler available Yes muffler & header available CALL FOR INFORMAllON EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII %720 1 -800-63HOBBV 808 935-9009 HA WAIl STD TIME 10 AM7PM Mon-S 00 Without Muffler ging plane down walking larger circle adds unneeded tenths second time Charging GloBee Fire Plug have sev eral requests concerning proper charging time battery system find gel cell bat tesy included unit should charged min imum overnight 15 hours prior contest use always carry additional freshly charged battery practice morning various events can insert freshly charged cell afternoons performance have seen competitors using battery day long adverse problems just worth taking chance Unfortunately gel cell batteries start run down will hold full charge few seconds battery will drop off glow plug second two will diminished engine starts first flip okay however have keep battery connected length time reduced amperage will result hard starting engine Also thought might mention use piece styrofoam stuck over battery posts held place healthy wrap electrical tape around battery assures bat tery contacts short out touching piece metal oould potential fire hazard occurred have also seen rheostat GloBec bat tery turned up too high Rat Scale Race en gines sometimes engines will just sit prop rocking back forth after being flippedan indication too-hot glow plug burning fuel away piston mak ing flip-starts virtually impossible rheostat must adjusted contacts touch airplane glow plug has very faint glow will give decent combustion range quick restarting As always comments photos solic ited appreciated Mini-Electrics/SruII Continued page 92 power Has ever happened spite having worked hard keep weight minimum adding lastminute details putting really nice finish often brings flying weight Mini-Electric little higher intended model youre building neat kit set great plans turns out just little bit larger size recommended Mini-Electric power sun dry reasons sometimes find power available quite sufficient get hoped-for flying performance some simple things can coax lit tle power endurance Mini-Electric systemand some things should try First make sure flight battery cells OKnot vented cooked leak ing Damaged ones will need replaced Second make sure propeller ap propriate size pitch Above dont go larger higher-pitch prop obtain power Such prop likely give less thrnst worse can overheat possibly damage motor Remember slow motor down larger prop higher current converse also holds highest threshold current want little mo tors operate about 21/2 2 3A amps under 3 amps Sure going above levels short periods 31/2 4 amps wont pose immediate risk cooking motor battery general sport flying decent longev ity motors stay 3 amps below maximum recommended current re fers current drawn operating ground bench test so-called static load air prop will unload little will speed up causing current drop about 14 amp have access test meter can measure up 5 amps current fine tuning little electric mo tors finding right prop safe max imum power becomes very easy Otherwise stick recommended prop size Third make sure motor bearings free tiny drop oil helps gear mesh between pinion spur gears free binding little loose side much better tight fit least bit binding will render MiniElectric gutless blob motor has plastic pinion make sure cracked slightest hairline crack often dif ficult detect will distort under load sap tremendous amount power Since can assume have overcome charging problems building recoinContinued page 172 Print carefully shipping label UU 0 1975 July first issue 01976 0197701982 0197801983 01979sold89840 1980Out-9*9860198101986 Enclose aseparate $2200 check set ordered NO CASHNO CHARGES rI IU IU II II Name II Street Address II cityState ZIP Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr L on VA 22090 September 1988 169 40 CC/24 CU IN AMA CENrE5FO5 Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashedf Limited Quantities Sets Are Complete
Edition: Model Aviation - 1988/09
Page Numbers: 77, 168, 169
LITTLE QUICKIE construction have nu merous requests information visual aids relating construction Scale Racers majority Midwestern events Scale Rac ing profits largest entry level Larry Dziak has shared some proven construction techniques will share photos shows prirnasy construc tion %-in-thick fuselage Things note extremely large motor mounts 34 x % bottom mount extending hack beyond wing giving fuselage extra strength avoid having tail break off during hard landings Larry puts two spruce spars fuse lage directly under wing can see right over lower hardwood mount runs way either side elevator mount Larry lightens hard wood drilling holes strength maintamed additional weight removed can also note tank-mounting recess right below wing tank can securely attached hardwood mount recessed under balsa top sheeting Wing construction falrly straightforward Larry uses flat-bottomed wing made / balsa A6 hardwood spar mounting plate bellerank addition Larry uses 3R-in-sq spruce leading edge piece / plywood tralling edge stiffness way after top wing skin glued can sand trailing edge sharp line juneContinued page 168 Bill Bischoffs hot thumb made Cox Y2A glow plug clip Engine Kus torn Kraftsmanship Note left-hand Tornado prop fast-fill button fuel tank Photo Eric Tomchik September 1988 77 Control Line Racing John Ballard 10102 lUmb4ewkk Dr Louisville KY 40223 two studies some Southern California fliers used discuss piloting techniques Johns column fliers LL R John McCollum Dave Braun Jim Lueken rest RL R Paul Gibeault Bob Kerr barely visible Howard Shahan Heres Larry Dziak builds strong Scale Racer Photo top shows profile fuselages hardwood inserts lightening holes Im mediately below assembled plane showing entire front fuelage TE wing reinforced thin plywood cover plywood fin cut out buried elevator pushrod runs through aluminum tube rear Wing structure R has buried belicrank thin plywood TE strip hardwood spars Wing skins balsa Ribs thick balsaand lots epoxy holds togetherl info column balance combination construction em phasize accurate alignments good technique control system installation An excellent example good design practice Pink Lady Formula 40 presented De cember 1987 issue Model Aviation Full-Size Plan No 573$4 Engine selection preparation real heart competition setup Current Speed en gines competitive basic design days Speed secret long past secrets making strong engine 1 Freerunning crankshaft good bearings 2 Prop erly fitted piston sleeve 3 Good cylinder head fit 4 Accurately fitted free-running disk rotor rear-intake engines basics right engine fed right amount fuel will make competi tive amount power equipment pro cesses check andif necessarycorrect items beyond scope article several individuals business en gine tuning will set up engine have found engines generally pretty close being right come out box services engine specialists needed rebuild time comes list commonly used Speed en gines includes A/FAI Speed OPS 15 Rossi 15 Mk Ill K&B/Cox 15 Conquest Supertigre X-l5 RI cur rent AMA class record-holder B Speed OPS 29 Supertigre X-29 current AMA class record-holder K&B 49 RI D Speed 05 65 VR DF current AMA class record-holder K&B 65 OPS 65 Ducted Fan Picco 65 Ducted Fan Rossi 65 Ducted Fan F-40 Speed OS 40 VR-P K&B 65 Picco 40 RI/RE Supertigre X-40 RI current AMA class record-holder Jet Speed Dyna-Jet current AMA class record-holder fuel engines no se crets piston engines three basic ingredi ents methanol nitromethane oil Jets two basics nitromethane propy lene oxide Typical fuel formulas given low Break-in/test/F-40 40% methanol 40% nitromethane 20% oil 10% synthetic plus 10% castor Contest piped engines classes B 15% methanol 65% nitromethane 20% oil 17% synthetic plus 3% castor Contest class D 0%-5% methanol 75%80% nitromethane 20% oil 17% synthetic plus 3% castor Jet 50% nitromethane 50% propylene oxide recommend using less 20% oil piston engines possible run less smallest mistake setting needle too lean will likely result damaged en gine also really like use castor oil com bination synthetic pil produces sig nificant extra protection primarily connect ing rod/crankpin bearing preceding discussion have skipped over Jets mostly because basics bit dif ferent essentially engine use Dyna-Jet stock form has re mained essentially unchanged since 1948 HoW ever engine/event Speed secret alive well Jet preferred class suggest follow trainer route recip-engine classes using Phire Phart published column August 1986 issue trainer trainer use stock engine fuel mix 80% methanol 20% methyl ethyl ke tone MEK After can fly pylon etc start experimenting high-lift valve re tainers nitromethane/propylene oxide fuel stock Dyna-Jet nitro/propylene using re tainer 06 over stock will run about 170 mph want go really fast Jet best information have found Super Burp con struction article December 1978 Model Avi ation final observation best investment can make starting Speed join North American Speed Society publishes quarterly newsletter Speed Times ab solute gold information model design engine setup parts/hardware supply sources Membership Open members $20/year address North American Speed Society Box 82294 North Bumaby BC Canada V5C 5P7 thanks Bill Nusz taking time spending effort necessary give us very enlightening observations Have funfly Speed ternfic how-to description steps take setting up stock engine top performance Bill Hagers RC Pylon Racing column month Although addresses Sport Pylon Racing information perfectly good CL Speed too RMcM CL Racing/Ballard Continued page 77 ture / plywood will note bellcrank off center pushrod coming down centerline winga necessity internally mounted elevator controls PRODUCTS FOR THE DI$CERNNG MODELER Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes * Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers * Specialized Exhaust Systems Unsurpassed Wn C Another photos shows wing mounted fuselage /16 plywood applied over entire frontal section back almost rear wing addition can see pushrod passing through fuselage enclosed alu mmum tube elevator horn attached right below stab Half-A glow plug clip have shown ex cellent hot thumb can made very quickly inexpensively addition brass strip soldered typical Cox VzA glow plug clip addition washer soldered bottom added brass strip aid provid ing positive location plugs center post particular unit can also used Scale Rac ing addition Mouse Performance results have just received some Racing time results recent meet Califor nia show Scale Race times 557 10 first-placer Mike Shahan 61184 secondplace Bill Lee Rat Race saw spectacular 43092 win 50513 second place both being Shahan-Fogg entries AMA Slow Rat showed Fox/Repp team winning 81020 Bill Lee second 81778 John MeCollum also included West Coasts recent Sebree Hayes Memorial AAA Meet Scale Racing won Vic Gamer time 61350 Mike Shahan second 62190 Rat Race won Bob Fogg 44684 Howard Shahan came next 45060 Slow Rat some sparkling times led Vie Garner 60863 Fox/Repp team 63560 Good piloting techniques am enclosing two photographs recent California contest lot three-up flying photo shows three pilots John McCollum ready pass Dave Brown Note John has come up behind him starting ralse fly ing hand up get clear Daves head smaller pilots essence trapped hind taller pilots hand extremely low As comes up behind taller pilot should ralse flying hand up near bead bring alrcraft over minimum amount speed loss smooth pass other photo shows three pilots pi lot left actually blocking other two Bob Kerr wearing Livermore Flyer shirt way behind planenote over left However hand behind Howard Sha han should up over top head plane will catch up properly manmum time alrspeed loss arm position shown actually slowing drag168 Model Aviation TWINS ARE CLASSIC AND AFFORDABLE Looking inexpensive opposed twin replace shaking smelly gas burner want scale like appearance smooth running 2 cycle glow operation Yes its back basics EHS Tradings Twin Star Comments .Have lot engiwe no doubt ably best. Bd Thomas Lake Havasu AZ .The Twin Star ism esceptionaly smooth engne thu displacement size. Clarance Lee ENGINE EDITOR RCM MAGAZINE answer question often ked- muffler available Yes muffler & header available CALL FOR INFORMAllON EHS TRADING LTD 400 HUALANI ST BLDG 13E HILO HAWAII %720 1 -800-63HOBBV 808 935-9009 HA WAIl STD TIME 10 AM7PM Mon-S 00 Without Muffler ging plane down walking larger circle adds unneeded tenths second time Charging GloBee Fire Plug have sev eral requests concerning proper charging time battery system find gel cell bat tesy included unit should charged min imum overnight 15 hours prior contest use always carry additional freshly charged battery practice morning various events can insert freshly charged cell afternoons performance have seen competitors using battery day long adverse problems just worth taking chance Unfortunately gel cell batteries start run down will hold full charge few seconds battery will drop off glow plug second two will diminished engine starts first flip okay however have keep battery connected length time reduced amperage will result hard starting engine Also thought might mention use piece styrofoam stuck over battery posts held place healthy wrap electrical tape around battery assures bat tery contacts short out touching piece metal oould potential fire hazard occurred have also seen rheostat GloBec bat tery turned up too high Rat Scale Race en gines sometimes engines will just sit prop rocking back forth after being flippedan indication too-hot glow plug burning fuel away piston mak ing flip-starts virtually impossible rheostat must adjusted contacts touch airplane glow plug has very faint glow will give decent combustion range quick restarting As always comments photos solic ited appreciated Mini-Electrics/SruII Continued page 92 power Has ever happened spite having worked hard keep weight minimum adding lastminute details putting really nice finish often brings flying weight Mini-Electric little higher intended model youre building neat kit set great plans turns out just little bit larger size recommended Mini-Electric power sun dry reasons sometimes find power available quite sufficient get hoped-for flying performance some simple things can coax lit tle power endurance Mini-Electric systemand some things should try First make sure flight battery cells OKnot vented cooked leak ing Damaged ones will need replaced Second make sure propeller ap propriate size pitch Above dont go larger higher-pitch prop obtain power Such prop likely give less thrnst worse can overheat possibly damage motor Remember slow motor down larger prop higher current converse also holds highest threshold current want little mo tors operate about 21/2 2 3A amps under 3 amps Sure going above levels short periods 31/2 4 amps wont pose immediate risk cooking motor battery general sport flying decent longev ity motors stay 3 amps below maximum recommended current re fers current drawn operating ground bench test so-called static load air prop will unload little will speed up causing current drop about 14 amp have access test meter can measure up 5 amps current fine tuning little electric mo tors finding right prop safe max imum power becomes very easy Otherwise stick recommended prop size Third make sure motor bearings free tiny drop oil helps gear mesh between pinion spur gears free binding little loose side much better tight fit least bit binding will render MiniElectric gutless blob motor has plastic pinion make sure cracked slightest hairline crack often dif ficult detect will distort under load sap tremendous amount power Since can assume have overcome charging problems building recoinContinued page 172 Print carefully shipping label UU 0 1975 July first issue 01976 0197701982 0197801983 01979sold89840 1980Out-9*9860198101986 Enclose aseparate $2200 check set ordered NO CASHNO CHARGES rI IU IU II II Name II Street Address II cityState ZIP Make checks payable AMA Send orders Academy Model Aeronautics 1810 Samuel Morse Dr L on VA 22090 September 1988 169 40 CC/24 CU IN AMA CENrE5FO5 Collectors Notice Just released AMA Museum BACK ISSUES Model Aviation magazinesNEW original car tons sale YEAR SETS ONLY Check selections below send SEPARATE $2200 CHECK individual set Orders will filled first-come basis set request sold out check will returned being cashedf Limited Quantities Sets Are Complete