S I] George M Myers EVERY SO OFTEN feel inclined pass along some simple little electronic gadgets fun build use column guys hot soldering irons snappy side-cutters Fig 1 shows kit item sincerely believe should found transmitter Flight Pacer avail able Telecraft Box 495 Kirkland WA 98033 price make use ticket group B items received AMA renewal $10 didnt renew price $1295 keep telling pays belong AMA president Telecraft Boeing Hawks also year Vince Calouri has given permission reproduce cir cuit will found Fig 2 14yr old son Tim built less hour operation device emits loud beep intervals pre-select 15 10 minutes available mounted transmitter shown Fig 3 connected receive power whenever transmitter operating beeps can used time out sailplane flights pattern flights can warn helicopter pilots impending fuel exhaustion its im portant function keep reminding transmitter turned very handy around shop especially finish setting up controls new plane go bed thinking system charge isnt because left transmitter turned Also number times people have heard thing beeping car way field downright embarrassing fortunate receive very first have using since 1973 Right now feel un comfortable fly system Try youll like word caution order stallation device other can affect operation RC system Nicad batteries once charged awful hurry dump charge through metallic path such tip soldering iron Therefore first step should locate remove battery lead transmitter On/Off switch Tape end keep out mischief connecting red lead Flight Pacer switch terminal feeds transmitter circuit board black lead negative side bat tery pack ground whichever appro priate situation case Tims Cox/Sanwa radio switch very tiny buried closely-packed trans mitter necessary remove switch gain access common ter minal black wires come together red wire s center terminal three rather closelyspaced terminals recognized poten tial problem dealt above someone less familiar electronics might tempted work red wire place could have expensive con sequences Put red wire back place last step installation Brad Eaton Pompton Plains NJ sent laM BZK 8 N Lf4zzi2 NESSS IL~J1 Fig 2 Schematic Flight Pacer kit emphasizes small number components quite reliable authors tests verified 10 Model Aviation Fig 1 Containing small number parts Flight Pacer kit reviewed text builds easily Use 27-watt iron 1/8-in tip VSIL1S ss-r IA1E So s-ve VOLTS Fig 3 Flight Pacer shown mounted Zap Cox/Sanwa radio emits audible signal adjusted what flight-timing needs may very nice letter last August detailing Servo Reverser shown Fig 4 5 Quoting Brads letter have tested circuit over voltage tem perature ranges far exceeding modeler will encounter normal circum stances circuit sensitive temperature long good tantalum mylar capacitor used timing cir cuit unit calibrated putting transmitter controls neutral installing reverser between servo receiver Turn system shunt timing resistor various values resistance Rt until servo sits same neutral position reverser Ive built works fine past years Ive reversed servos times have recheck service literature find out built originally Its lot easier use reverser have room Again quoting Mr Eatons letter Fig 4 shows circuit diagram positive pulse system Fig S shows negative pulse system Pro-Line Circuit operation positive pulse mode follows 1 Gate inverts pulse receiver/decoder 2 The output triggers 555 timer holds Gate B off 3 The 555 timed pulse width equal double normal pulse width receiver/decoder 4 The 555 pulse inverted pulse combined Gate B thereby providing reverse direction information 5 Gates C D parallel invert pulse re-establish positive pulse mat increase output drive capabili ties Operation negative-pulse systems similar circuit consumes less 5 ma can further reduced expensive RCA CD4047 used replace 555 timer Parts should available parts distributor like Poly-Paks couple dollars Put servo reverser middle aileron extender cable get simple circuit connections flying buddy Bob Aberle suggests Zap ICs back-to-back wire point-to-point save making PC board Encapsulate finished product block epoxy Ready-made servo reversers also available Quantized Control PO Box 164 Amherst MA 01002 cant comment performance because Ive never actually used ultimate solution course Kraft Signature series equivalent provides servo direction deflection controls front panel absence above owe Brad Eaton vote thanks sharing work us Note Observe usual precautions working CMOS components avoid damage static electricity charges Fig 6 shows another useful gadget found Dallas RC Newsletter News lifted ARCS newsletter credited Hank Rejuneic Write see Hank Ill know send check Hanks Glitch Detector good example turning problems advantage DTL Diode-Transistor Logic integrated cir cuits very sensitive noise Hank uses property detect intermittent voltage drops loaded battery pack use load 10-ohm resistor placed battery pilot light latched using pushbutton Next tap around six sides battery pack using pencil chiselshaped extra erasers end bopper light goes out battery pack has problems should check resolder necessary joint pack pigtail wires plug doesnt fix trouble batteries should checked cell-by-cell isolate culprit still cant find use battery pack power fuel pump hook cells parallel glow-plug battery heavens sake dont fly thing like about gadget can used field plane make adapter fits charging jack can hold plane up its wings run engine see vibration getting battery pack assuming have new plane thats giving trouble Simple screwdriver about useful Incidentally before get lot letters about charging Nicads parallel dont easiest way switch four cells series parallel reliably use two Noble 4P2T switches such used switch harnesses Fig 7 shows use defective power pack continued page 91 4 J 0I, s4 5I6t4AL Th CD 40i11I POSDI8X Dli ICi MC 84 5L ~03 FAitCIibTL IC 5TATooio Fig 4 Brad Eatons servo reverser connected positive pulse 4ev q 13 I CA CD4011 /t 3 4 ~4 sitc LF Fig 5 Eatons servo reverser connected negative-pulse systems - - sflt1 C4A6en 21LCISt3 TUfT Fig 7 use defective power pack glow-plug energizer May1977 11 SICJAL ltd Fig 6 Hanks glitch detector Ole RAMPS U ALL 72MHz 27MHz SYSTEMS NOW Ready delivery Featuring interference resistant transmitter receiver combination available trade Radiates highest signal level yes unit market today Proven helicopter capability Demonstratably faster powerful servos outstand ing resolution centering Stick assemblies smooth silk through out temperature range 10 1200F Transmitter control stick unit designed maximum comfort has feel instills confidence re duces fatigue Reliability has design goal Full 6 months warranty immediate factory servicing Study spec sheet free asking compare anything now being offered Youll see believe know VARIANT way go Visit us Toledo Show WESTPORT INTERNATIONAL INC 347 Boston Post Road Milford Conn 06460 will yield peak flight performance stock props Reworked props have tailored according ideas presented article Primarily diameter and/or pitch increase over acceptable stock props strived keeping rpm maximum engine horsepower range exten sive original prop work completed props checked excellent mula-I aircraft K&B 40 S III en gine flown proven competitive Chart information presented ob tained running session accu rate comparisons Results achieved inferior engine running under far ideal climatic conditions rpm shown about 2000 rpm below normal engine expectancy under better conditions Test equipment used K&B S III engine expanded meter photo cell tach ometer specially built thrust stand Engine tach purchased items nothing special thrust stand precision built fulfilling lifelong desire Although thrust stand readings needed comparative accurate Highest speed prop thrust reading 144 oz 9 lbs great deal thrust 40 cubic inch engine indicating outstanding work en gine manufacturers have extended us last few years interesting know stunt-type propeller yields considerably static thrust best speed props Chart #3 presented evaluation differences tested blade shapes No tempt has ever made experiment blade shape specific size propeller however chart comparisons dicate work area could beneficial According chart #2s test results expected determine super prop frankly super prop yet developed tests really show consequences alternating various de sign parameters example first three tests made same prop simply clipping tips time reduce diameter marked rpm crease indicates added horsepower small static thrust loss increased aircraft speed Remember test conducted starting too much prop same improvement can expected using right size prop beginning Note large static thrust increase gained wider blade width Such has proven beneficial actual racing symmetrical airfoil experiments drag reduction interesting changing lower drag airfoil diameter pitch increased horsepower loss Symmetrical airfoil props have used actual race performances yet flight tests indicate show great promise profitable future development conclusion purpose article hopefully incite intelligent speed propeller experimentation field Past racing performances too us have proven considerably propeller efficiency improvement sorely needed nation-wide break sound barrier someday must work ourselves fellow racers lets get up go Radio Technique/Myers continued page 11 glow-plug energizer have both switches 15 VDC side can light glow plug cant charge pack both switches 48 VDC side can charge pack cant light glow plug switch set direction pack Off cant anything except possibly draw current cell number 1 theres some way connect between 8 terminal Since already know least cells bad install piece wire place cell #1 theres no way draw current switches opposing positions can get fancy put whole thing plastic case 0-to-S Amp meter iron-vane types preferred durability low cost May1977 91 have pretty nice starting setup Well thats about month gang Gotta go shovel some unusual weather having off sidewalk Write youve got idea column please George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Scale/Atkinson continued page 18 cause contact cement constitutes 50% weight Make sure skin well attached core 50% strength wing its skin After wing halves epoxied together always apply least 3-in-wide glass tape center wing epoxy well Cut-outs servos etc can weaken FINE QUALITY KITS AND ACCESSORIES 1 /72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SPINNERS TS LS ENGINEKITS INEGUNS CYLINDERS L PANTS SCALE DRAWINGS PIES SEND 50c FOR COMPLETE CATALOG center wing tape will join skin right wing left foam wing cases especially tap ered wing truer all-wood wing can Also wash-in wash-out can achieved satisfactorily complex cut elliptical wing such Spitfire Typhoon Since cannot cut curved core cases can achieved cutting back leading trailing edge cutting elliptical shape Carefully shape sharp knife sandpaper block match airfoil foam core hard sounds built Hawker Fury several years ago using method wing came out very well Stuka Corsair also have rather unique wings may cut several sections plywood gussets attached form inverted gull-wing effect foam wings scale models new get some foam try different types wings will surprised what can done foam little ingenuity Bud Atkinson 734 North 6th St Ter race Blue Springs MO 64015 RC Old-Timers/Bolton continued page 21 elers Tim Banaszals Sec/Treas 1947 Superior Ave Whiting IN 46394 Model Engine Collectors Assn PO Box 725 Indianapolis IN 46206 Letters received fine letter Mr Ray Heit Los Alamitos Calif concern ing January column Ray originally designed Scram Doc Mathews recently built captured photo sent us Ray writes uilt original Scram Flying Aces magazine published July 1938 Vol 29 Scram several models designed myself magazine.. 17. m 7-foot wing powered eternal Brown Jr . Interestingly quite coincidental just recently finished almost exact dupli cate Scram. model has taken nearly eight months complete mention way comparison sev eral days took finish model back good old days.. consuming hobby. sneak out shop bury myself balsa glue .. Scram outfitted radio control throttle rudder elevator plus re enforcing wings empennage Other its authentic original color red cream Ray goes talk about growing up Brooklyn member Brooklyn Skyscrapers says contests time held Brunswick NJ guys like Kovel Basett Zaic Shere shaw somebody called Ehling fly against Ray made Nationals Akron Detroit St Louis goes uilding model air planes still favorite hobbies. solid enjoyment thera peutic relaxation Thank Ray enjoyable letter Keith Williams out Bartels ville OkIa received great treatise exposure early gas modeling rewards gathered lucky enough proud owner Bantam 19 first engine Keith dwells early activity area some pros like Jack Cordell winning everything sight recalls Cordell using folding props Comet Mercury similar stuff Keith states hasnt heard since Well Keith head down Pensacola watch Tom McLaughlan turn up Rossi 15 26000 using fold ing props Toms master machinist believe need just able construct something capable handling 26000 rpm way Tom number man forthcoming FAI Power team also builds Old-Timers has Zipper something else also has big original C job own design can document back 40 have bugging him come up set plans ship Anyway back Keith writes got rein volved Old-Timers has stable ships wouldnt believe has Playboy Sr Jr Powerhouse Struck Super Cloud Flying Cloud Korda Wake field 020 Sailplane Request Gollywok Sparky 21 Buzzard ombshell 0 10 building Comet Sail plane just about out room Keith flies Powerhouse RC assist great letter highly motivated guy Keith says summer hes going over win Doc Mathews hardware forth coming contests Out west coast SAM 21 revving up full bore 1977 season dedicated RC assist group out San Jose area led President 92 Model Aviation AMERICAN riisan C3B ThCLASSICS KINNERworlds finest models SPORTSTER Send free brochure Aristocratft*OIOOORVoL 39w pan 019 power op 3 channels rio greaf sporf froiner 1930s91295 10501 WIHOowA 009 MEN FOR O R200SPON 020 POSERCOSELO Pee OUSEC 015 FOR 2000 coTROL Oo FEE FUR,05*00 PROS M %OLRER E50 Tb FAIRCHILD 22 BELLANCA 19 WingspanprIce lobe #101 sow 09 29 Powerannotint50520 COO OR OO POWER FLMODELS 3 Channel RIC #10791021 el 703 2739593 I2INOOFAR 000 PORtE FOR 00 2sownS 0004*000 000 10* F OR P002155 020 FOsOoE PULSE 020 SOALL &tTIROOOYL011Ni. see local hobby dealer 0643 ASHBY PL FAIRFAX VA 22030 __rOXBAT ~EDRAwiffGSjI AVOqRISON 1977 CATALOG 25$ 48500 MC KENZIE HWY OREGON 97488 DEPT MA 181 PAWNEE STREET I4iWAMS SAN MARCOS CA 92069
Edition: Model Aviation - 1977/05
Page Numbers: 10, 11, 91, 92
Edition: Model Aviation - 1977/05
Page Numbers: 10, 11, 91, 92
S I] George M Myers EVERY SO OFTEN feel inclined pass along some simple little electronic gadgets fun build use column guys hot soldering irons snappy side-cutters Fig 1 shows kit item sincerely believe should found transmitter Flight Pacer avail able Telecraft Box 495 Kirkland WA 98033 price make use ticket group B items received AMA renewal $10 didnt renew price $1295 keep telling pays belong AMA president Telecraft Boeing Hawks also year Vince Calouri has given permission reproduce cir cuit will found Fig 2 14yr old son Tim built less hour operation device emits loud beep intervals pre-select 15 10 minutes available mounted transmitter shown Fig 3 connected receive power whenever transmitter operating beeps can used time out sailplane flights pattern flights can warn helicopter pilots impending fuel exhaustion its im portant function keep reminding transmitter turned very handy around shop especially finish setting up controls new plane go bed thinking system charge isnt because left transmitter turned Also number times people have heard thing beeping car way field downright embarrassing fortunate receive very first have using since 1973 Right now feel un comfortable fly system Try youll like word caution order stallation device other can affect operation RC system Nicad batteries once charged awful hurry dump charge through metallic path such tip soldering iron Therefore first step should locate remove battery lead transmitter On/Off switch Tape end keep out mischief connecting red lead Flight Pacer switch terminal feeds transmitter circuit board black lead negative side bat tery pack ground whichever appro priate situation case Tims Cox/Sanwa radio switch very tiny buried closely-packed trans mitter necessary remove switch gain access common ter minal black wires come together red wire s center terminal three rather closelyspaced terminals recognized poten tial problem dealt above someone less familiar electronics might tempted work red wire place could have expensive con sequences Put red wire back place last step installation Brad Eaton Pompton Plains NJ sent laM BZK 8 N Lf4zzi2 NESSS IL~J1 Fig 2 Schematic Flight Pacer kit emphasizes small number components quite reliable authors tests verified 10 Model Aviation Fig 1 Containing small number parts Flight Pacer kit reviewed text builds easily Use 27-watt iron 1/8-in tip VSIL1S ss-r IA1E So s-ve VOLTS Fig 3 Flight Pacer shown mounted Zap Cox/Sanwa radio emits audible signal adjusted what flight-timing needs may very nice letter last August detailing Servo Reverser shown Fig 4 5 Quoting Brads letter have tested circuit over voltage tem perature ranges far exceeding modeler will encounter normal circum stances circuit sensitive temperature long good tantalum mylar capacitor used timing cir cuit unit calibrated putting transmitter controls neutral installing reverser between servo receiver Turn system shunt timing resistor various values resistance Rt until servo sits same neutral position reverser Ive built works fine past years Ive reversed servos times have recheck service literature find out built originally Its lot easier use reverser have room Again quoting Mr Eatons letter Fig 4 shows circuit diagram positive pulse system Fig S shows negative pulse system Pro-Line Circuit operation positive pulse mode follows 1 Gate inverts pulse receiver/decoder 2 The output triggers 555 timer holds Gate B off 3 The 555 timed pulse width equal double normal pulse width receiver/decoder 4 The 555 pulse inverted pulse combined Gate B thereby providing reverse direction information 5 Gates C D parallel invert pulse re-establish positive pulse mat increase output drive capabili ties Operation negative-pulse systems similar circuit consumes less 5 ma can further reduced expensive RCA CD4047 used replace 555 timer Parts should available parts distributor like Poly-Paks couple dollars Put servo reverser middle aileron extender cable get simple circuit connections flying buddy Bob Aberle suggests Zap ICs back-to-back wire point-to-point save making PC board Encapsulate finished product block epoxy Ready-made servo reversers also available Quantized Control PO Box 164 Amherst MA 01002 cant comment performance because Ive never actually used ultimate solution course Kraft Signature series equivalent provides servo direction deflection controls front panel absence above owe Brad Eaton vote thanks sharing work us Note Observe usual precautions working CMOS components avoid damage static electricity charges Fig 6 shows another useful gadget found Dallas RC Newsletter News lifted ARCS newsletter credited Hank Rejuneic Write see Hank Ill know send check Hanks Glitch Detector good example turning problems advantage DTL Diode-Transistor Logic integrated cir cuits very sensitive noise Hank uses property detect intermittent voltage drops loaded battery pack use load 10-ohm resistor placed battery pilot light latched using pushbutton Next tap around six sides battery pack using pencil chiselshaped extra erasers end bopper light goes out battery pack has problems should check resolder necessary joint pack pigtail wires plug doesnt fix trouble batteries should checked cell-by-cell isolate culprit still cant find use battery pack power fuel pump hook cells parallel glow-plug battery heavens sake dont fly thing like about gadget can used field plane make adapter fits charging jack can hold plane up its wings run engine see vibration getting battery pack assuming have new plane thats giving trouble Simple screwdriver about useful Incidentally before get lot letters about charging Nicads parallel dont easiest way switch four cells series parallel reliably use two Noble 4P2T switches such used switch harnesses Fig 7 shows use defective power pack continued page 91 4 J 0I, s4 5I6t4AL Th CD 40i11I POSDI8X Dli ICi MC 84 5L ~03 FAitCIibTL IC 5TATooio Fig 4 Brad Eatons servo reverser connected positive pulse 4ev q 13 I CA CD4011 /t 3 4 ~4 sitc LF Fig 5 Eatons servo reverser connected negative-pulse systems - - sflt1 C4A6en 21LCISt3 TUfT Fig 7 use defective power pack glow-plug energizer May1977 11 SICJAL ltd Fig 6 Hanks glitch detector Ole RAMPS U ALL 72MHz 27MHz SYSTEMS NOW Ready delivery Featuring interference resistant transmitter receiver combination available trade Radiates highest signal level yes unit market today Proven helicopter capability Demonstratably faster powerful servos outstand ing resolution centering Stick assemblies smooth silk through out temperature range 10 1200F Transmitter control stick unit designed maximum comfort has feel instills confidence re duces fatigue Reliability has design goal Full 6 months warranty immediate factory servicing Study spec sheet free asking compare anything now being offered Youll see believe know VARIANT way go Visit us Toledo Show WESTPORT INTERNATIONAL INC 347 Boston Post Road Milford Conn 06460 will yield peak flight performance stock props Reworked props have tailored according ideas presented article Primarily diameter and/or pitch increase over acceptable stock props strived keeping rpm maximum engine horsepower range exten sive original prop work completed props checked excellent mula-I aircraft K&B 40 S III en gine flown proven competitive Chart information presented ob tained running session accu rate comparisons Results achieved inferior engine running under far ideal climatic conditions rpm shown about 2000 rpm below normal engine expectancy under better conditions Test equipment used K&B S III engine expanded meter photo cell tach ometer specially built thrust stand Engine tach purchased items nothing special thrust stand precision built fulfilling lifelong desire Although thrust stand readings needed comparative accurate Highest speed prop thrust reading 144 oz 9 lbs great deal thrust 40 cubic inch engine indicating outstanding work en gine manufacturers have extended us last few years interesting know stunt-type propeller yields considerably static thrust best speed props Chart #3 presented evaluation differences tested blade shapes No tempt has ever made experiment blade shape specific size propeller however chart comparisons dicate work area could beneficial According chart #2s test results expected determine super prop frankly super prop yet developed tests really show consequences alternating various de sign parameters example first three tests made same prop simply clipping tips time reduce diameter marked rpm crease indicates added horsepower small static thrust loss increased aircraft speed Remember test conducted starting too much prop same improvement can expected using right size prop beginning Note large static thrust increase gained wider blade width Such has proven beneficial actual racing symmetrical airfoil experiments drag reduction interesting changing lower drag airfoil diameter pitch increased horsepower loss Symmetrical airfoil props have used actual race performances yet flight tests indicate show great promise profitable future development conclusion purpose article hopefully incite intelligent speed propeller experimentation field Past racing performances too us have proven considerably propeller efficiency improvement sorely needed nation-wide break sound barrier someday must work ourselves fellow racers lets get up go Radio Technique/Myers continued page 11 glow-plug energizer have both switches 15 VDC side can light glow plug cant charge pack both switches 48 VDC side can charge pack cant light glow plug switch set direction pack Off cant anything except possibly draw current cell number 1 theres some way connect between 8 terminal Since already know least cells bad install piece wire place cell #1 theres no way draw current switches opposing positions can get fancy put whole thing plastic case 0-to-S Amp meter iron-vane types preferred durability low cost May1977 91 have pretty nice starting setup Well thats about month gang Gotta go shovel some unusual weather having off sidewalk Write youve got idea column please George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Scale/Atkinson continued page 18 cause contact cement constitutes 50% weight Make sure skin well attached core 50% strength wing its skin After wing halves epoxied together always apply least 3-in-wide glass tape center wing epoxy well Cut-outs servos etc can weaken FINE QUALITY KITS AND ACCESSORIES 1 /72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SPINNERS TS LS ENGINEKITS INEGUNS CYLINDERS L PANTS SCALE DRAWINGS PIES SEND 50c FOR COMPLETE CATALOG center wing tape will join skin right wing left foam wing cases especially tap ered wing truer all-wood wing can Also wash-in wash-out can achieved satisfactorily complex cut elliptical wing such Spitfire Typhoon Since cannot cut curved core cases can achieved cutting back leading trailing edge cutting elliptical shape Carefully shape sharp knife sandpaper block match airfoil foam core hard sounds built Hawker Fury several years ago using method wing came out very well Stuka Corsair also have rather unique wings may cut several sections plywood gussets attached form inverted gull-wing effect foam wings scale models new get some foam try different types wings will surprised what can done foam little ingenuity Bud Atkinson 734 North 6th St Ter race Blue Springs MO 64015 RC Old-Timers/Bolton continued page 21 elers Tim Banaszals Sec/Treas 1947 Superior Ave Whiting IN 46394 Model Engine Collectors Assn PO Box 725 Indianapolis IN 46206 Letters received fine letter Mr Ray Heit Los Alamitos Calif concern ing January column Ray originally designed Scram Doc Mathews recently built captured photo sent us Ray writes uilt original Scram Flying Aces magazine published July 1938 Vol 29 Scram several models designed myself magazine.. 17. m 7-foot wing powered eternal Brown Jr . Interestingly quite coincidental just recently finished almost exact dupli cate Scram. model has taken nearly eight months complete mention way comparison sev eral days took finish model back good old days.. consuming hobby. sneak out shop bury myself balsa glue .. Scram outfitted radio control throttle rudder elevator plus re enforcing wings empennage Other its authentic original color red cream Ray goes talk about growing up Brooklyn member Brooklyn Skyscrapers says contests time held Brunswick NJ guys like Kovel Basett Zaic Shere shaw somebody called Ehling fly against Ray made Nationals Akron Detroit St Louis goes uilding model air planes still favorite hobbies. solid enjoyment thera peutic relaxation Thank Ray enjoyable letter Keith Williams out Bartels ville OkIa received great treatise exposure early gas modeling rewards gathered lucky enough proud owner Bantam 19 first engine Keith dwells early activity area some pros like Jack Cordell winning everything sight recalls Cordell using folding props Comet Mercury similar stuff Keith states hasnt heard since Well Keith head down Pensacola watch Tom McLaughlan turn up Rossi 15 26000 using fold ing props Toms master machinist believe need just able construct something capable handling 26000 rpm way Tom number man forthcoming FAI Power team also builds Old-Timers has Zipper something else also has big original C job own design can document back 40 have bugging him come up set plans ship Anyway back Keith writes got rein volved Old-Timers has stable ships wouldnt believe has Playboy Sr Jr Powerhouse Struck Super Cloud Flying Cloud Korda Wake field 020 Sailplane Request Gollywok Sparky 21 Buzzard ombshell 0 10 building Comet Sail plane just about out room Keith flies Powerhouse RC assist great letter highly motivated guy Keith says summer hes going over win Doc Mathews hardware forth coming contests Out west coast SAM 21 revving up full bore 1977 season dedicated RC assist group out San Jose area led President 92 Model Aviation AMERICAN riisan C3B ThCLASSICS KINNERworlds finest models SPORTSTER Send free brochure Aristocratft*OIOOORVoL 39w pan 019 power op 3 channels rio greaf sporf froiner 1930s91295 10501 WIHOowA 009 MEN FOR O R200SPON 020 POSERCOSELO Pee OUSEC 015 FOR 2000 coTROL Oo FEE FUR,05*00 PROS M %OLRER E50 Tb FAIRCHILD 22 BELLANCA 19 WingspanprIce lobe #101 sow 09 29 Powerannotint50520 COO OR OO POWER FLMODELS 3 Channel RIC #10791021 el 703 2739593 I2INOOFAR 000 PORtE FOR 00 2sownS 0004*000 000 10* F OR P002155 020 FOsOoE PULSE 020 SOALL &tTIROOOYL011Ni. see local hobby dealer 0643 ASHBY PL FAIRFAX VA 22030 __rOXBAT ~EDRAwiffGSjI AVOqRISON 1977 CATALOG 25$ 48500 MC KENZIE HWY OREGON 97488 DEPT MA 181 PAWNEE STREET I4iWAMS SAN MARCOS CA 92069
Edition: Model Aviation - 1977/05
Page Numbers: 10, 11, 91, 92
S I] George M Myers EVERY SO OFTEN feel inclined pass along some simple little electronic gadgets fun build use column guys hot soldering irons snappy side-cutters Fig 1 shows kit item sincerely believe should found transmitter Flight Pacer avail able Telecraft Box 495 Kirkland WA 98033 price make use ticket group B items received AMA renewal $10 didnt renew price $1295 keep telling pays belong AMA president Telecraft Boeing Hawks also year Vince Calouri has given permission reproduce cir cuit will found Fig 2 14yr old son Tim built less hour operation device emits loud beep intervals pre-select 15 10 minutes available mounted transmitter shown Fig 3 connected receive power whenever transmitter operating beeps can used time out sailplane flights pattern flights can warn helicopter pilots impending fuel exhaustion its im portant function keep reminding transmitter turned very handy around shop especially finish setting up controls new plane go bed thinking system charge isnt because left transmitter turned Also number times people have heard thing beeping car way field downright embarrassing fortunate receive very first have using since 1973 Right now feel un comfortable fly system Try youll like word caution order stallation device other can affect operation RC system Nicad batteries once charged awful hurry dump charge through metallic path such tip soldering iron Therefore first step should locate remove battery lead transmitter On/Off switch Tape end keep out mischief connecting red lead Flight Pacer switch terminal feeds transmitter circuit board black lead negative side bat tery pack ground whichever appro priate situation case Tims Cox/Sanwa radio switch very tiny buried closely-packed trans mitter necessary remove switch gain access common ter minal black wires come together red wire s center terminal three rather closelyspaced terminals recognized poten tial problem dealt above someone less familiar electronics might tempted work red wire place could have expensive con sequences Put red wire back place last step installation Brad Eaton Pompton Plains NJ sent laM BZK 8 N Lf4zzi2 NESSS IL~J1 Fig 2 Schematic Flight Pacer kit emphasizes small number components quite reliable authors tests verified 10 Model Aviation Fig 1 Containing small number parts Flight Pacer kit reviewed text builds easily Use 27-watt iron 1/8-in tip VSIL1S ss-r IA1E So s-ve VOLTS Fig 3 Flight Pacer shown mounted Zap Cox/Sanwa radio emits audible signal adjusted what flight-timing needs may very nice letter last August detailing Servo Reverser shown Fig 4 5 Quoting Brads letter have tested circuit over voltage tem perature ranges far exceeding modeler will encounter normal circum stances circuit sensitive temperature long good tantalum mylar capacitor used timing cir cuit unit calibrated putting transmitter controls neutral installing reverser between servo receiver Turn system shunt timing resistor various values resistance Rt until servo sits same neutral position reverser Ive built works fine past years Ive reversed servos times have recheck service literature find out built originally Its lot easier use reverser have room Again quoting Mr Eatons letter Fig 4 shows circuit diagram positive pulse system Fig S shows negative pulse system Pro-Line Circuit operation positive pulse mode follows 1 Gate inverts pulse receiver/decoder 2 The output triggers 555 timer holds Gate B off 3 The 555 timed pulse width equal double normal pulse width receiver/decoder 4 The 555 pulse inverted pulse combined Gate B thereby providing reverse direction information 5 Gates C D parallel invert pulse re-establish positive pulse mat increase output drive capabili ties Operation negative-pulse systems similar circuit consumes less 5 ma can further reduced expensive RCA CD4047 used replace 555 timer Parts should available parts distributor like Poly-Paks couple dollars Put servo reverser middle aileron extender cable get simple circuit connections flying buddy Bob Aberle suggests Zap ICs back-to-back wire point-to-point save making PC board Encapsulate finished product block epoxy Ready-made servo reversers also available Quantized Control PO Box 164 Amherst MA 01002 cant comment performance because Ive never actually used ultimate solution course Kraft Signature series equivalent provides servo direction deflection controls front panel absence above owe Brad Eaton vote thanks sharing work us Note Observe usual precautions working CMOS components avoid damage static electricity charges Fig 6 shows another useful gadget found Dallas RC Newsletter News lifted ARCS newsletter credited Hank Rejuneic Write see Hank Ill know send check Hanks Glitch Detector good example turning problems advantage DTL Diode-Transistor Logic integrated cir cuits very sensitive noise Hank uses property detect intermittent voltage drops loaded battery pack use load 10-ohm resistor placed battery pilot light latched using pushbutton Next tap around six sides battery pack using pencil chiselshaped extra erasers end bopper light goes out battery pack has problems should check resolder necessary joint pack pigtail wires plug doesnt fix trouble batteries should checked cell-by-cell isolate culprit still cant find use battery pack power fuel pump hook cells parallel glow-plug battery heavens sake dont fly thing like about gadget can used field plane make adapter fits charging jack can hold plane up its wings run engine see vibration getting battery pack assuming have new plane thats giving trouble Simple screwdriver about useful Incidentally before get lot letters about charging Nicads parallel dont easiest way switch four cells series parallel reliably use two Noble 4P2T switches such used switch harnesses Fig 7 shows use defective power pack continued page 91 4 J 0I, s4 5I6t4AL Th CD 40i11I POSDI8X Dli ICi MC 84 5L ~03 FAitCIibTL IC 5TATooio Fig 4 Brad Eatons servo reverser connected positive pulse 4ev q 13 I CA CD4011 /t 3 4 ~4 sitc LF Fig 5 Eatons servo reverser connected negative-pulse systems - - sflt1 C4A6en 21LCISt3 TUfT Fig 7 use defective power pack glow-plug energizer May1977 11 SICJAL ltd Fig 6 Hanks glitch detector Ole RAMPS U ALL 72MHz 27MHz SYSTEMS NOW Ready delivery Featuring interference resistant transmitter receiver combination available trade Radiates highest signal level yes unit market today Proven helicopter capability Demonstratably faster powerful servos outstand ing resolution centering Stick assemblies smooth silk through out temperature range 10 1200F Transmitter control stick unit designed maximum comfort has feel instills confidence re duces fatigue Reliability has design goal Full 6 months warranty immediate factory servicing Study spec sheet free asking compare anything now being offered Youll see believe know VARIANT way go Visit us Toledo Show WESTPORT INTERNATIONAL INC 347 Boston Post Road Milford Conn 06460 will yield peak flight performance stock props Reworked props have tailored according ideas presented article Primarily diameter and/or pitch increase over acceptable stock props strived keeping rpm maximum engine horsepower range exten sive original prop work completed props checked excellent mula-I aircraft K&B 40 S III en gine flown proven competitive Chart information presented ob tained running session accu rate comparisons Results achieved inferior engine running under far ideal climatic conditions rpm shown about 2000 rpm below normal engine expectancy under better conditions Test equipment used K&B S III engine expanded meter photo cell tach ometer specially built thrust stand Engine tach purchased items nothing special thrust stand precision built fulfilling lifelong desire Although thrust stand readings needed comparative accurate Highest speed prop thrust reading 144 oz 9 lbs great deal thrust 40 cubic inch engine indicating outstanding work en gine manufacturers have extended us last few years interesting know stunt-type propeller yields considerably static thrust best speed props Chart #3 presented evaluation differences tested blade shapes No tempt has ever made experiment blade shape specific size propeller however chart comparisons dicate work area could beneficial According chart #2s test results expected determine super prop frankly super prop yet developed tests really show consequences alternating various de sign parameters example first three tests made same prop simply clipping tips time reduce diameter marked rpm crease indicates added horsepower small static thrust loss increased aircraft speed Remember test conducted starting too much prop same improvement can expected using right size prop beginning Note large static thrust increase gained wider blade width Such has proven beneficial actual racing symmetrical airfoil experiments drag reduction interesting changing lower drag airfoil diameter pitch increased horsepower loss Symmetrical airfoil props have used actual race performances yet flight tests indicate show great promise profitable future development conclusion purpose article hopefully incite intelligent speed propeller experimentation field Past racing performances too us have proven considerably propeller efficiency improvement sorely needed nation-wide break sound barrier someday must work ourselves fellow racers lets get up go Radio Technique/Myers continued page 11 glow-plug energizer have both switches 15 VDC side can light glow plug cant charge pack both switches 48 VDC side can charge pack cant light glow plug switch set direction pack Off cant anything except possibly draw current cell number 1 theres some way connect between 8 terminal Since already know least cells bad install piece wire place cell #1 theres no way draw current switches opposing positions can get fancy put whole thing plastic case 0-to-S Amp meter iron-vane types preferred durability low cost May1977 91 have pretty nice starting setup Well thats about month gang Gotta go shovel some unusual weather having off sidewalk Write youve got idea column please George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Scale/Atkinson continued page 18 cause contact cement constitutes 50% weight Make sure skin well attached core 50% strength wing its skin After wing halves epoxied together always apply least 3-in-wide glass tape center wing epoxy well Cut-outs servos etc can weaken FINE QUALITY KITS AND ACCESSORIES 1 /72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SPINNERS TS LS ENGINEKITS INEGUNS CYLINDERS L PANTS SCALE DRAWINGS PIES SEND 50c FOR COMPLETE CATALOG center wing tape will join skin right wing left foam wing cases especially tap ered wing truer all-wood wing can Also wash-in wash-out can achieved satisfactorily complex cut elliptical wing such Spitfire Typhoon Since cannot cut curved core cases can achieved cutting back leading trailing edge cutting elliptical shape Carefully shape sharp knife sandpaper block match airfoil foam core hard sounds built Hawker Fury several years ago using method wing came out very well Stuka Corsair also have rather unique wings may cut several sections plywood gussets attached form inverted gull-wing effect foam wings scale models new get some foam try different types wings will surprised what can done foam little ingenuity Bud Atkinson 734 North 6th St Ter race Blue Springs MO 64015 RC Old-Timers/Bolton continued page 21 elers Tim Banaszals Sec/Treas 1947 Superior Ave Whiting IN 46394 Model Engine Collectors Assn PO Box 725 Indianapolis IN 46206 Letters received fine letter Mr Ray Heit Los Alamitos Calif concern ing January column Ray originally designed Scram Doc Mathews recently built captured photo sent us Ray writes uilt original Scram Flying Aces magazine published July 1938 Vol 29 Scram several models designed myself magazine.. 17. m 7-foot wing powered eternal Brown Jr . Interestingly quite coincidental just recently finished almost exact dupli cate Scram. model has taken nearly eight months complete mention way comparison sev eral days took finish model back good old days.. consuming hobby. sneak out shop bury myself balsa glue .. Scram outfitted radio control throttle rudder elevator plus re enforcing wings empennage Other its authentic original color red cream Ray goes talk about growing up Brooklyn member Brooklyn Skyscrapers says contests time held Brunswick NJ guys like Kovel Basett Zaic Shere shaw somebody called Ehling fly against Ray made Nationals Akron Detroit St Louis goes uilding model air planes still favorite hobbies. solid enjoyment thera peutic relaxation Thank Ray enjoyable letter Keith Williams out Bartels ville OkIa received great treatise exposure early gas modeling rewards gathered lucky enough proud owner Bantam 19 first engine Keith dwells early activity area some pros like Jack Cordell winning everything sight recalls Cordell using folding props Comet Mercury similar stuff Keith states hasnt heard since Well Keith head down Pensacola watch Tom McLaughlan turn up Rossi 15 26000 using fold ing props Toms master machinist believe need just able construct something capable handling 26000 rpm way Tom number man forthcoming FAI Power team also builds Old-Timers has Zipper something else also has big original C job own design can document back 40 have bugging him come up set plans ship Anyway back Keith writes got rein volved Old-Timers has stable ships wouldnt believe has Playboy Sr Jr Powerhouse Struck Super Cloud Flying Cloud Korda Wake field 020 Sailplane Request Gollywok Sparky 21 Buzzard ombshell 0 10 building Comet Sail plane just about out room Keith flies Powerhouse RC assist great letter highly motivated guy Keith says summer hes going over win Doc Mathews hardware forth coming contests Out west coast SAM 21 revving up full bore 1977 season dedicated RC assist group out San Jose area led President 92 Model Aviation AMERICAN riisan C3B ThCLASSICS KINNERworlds finest models SPORTSTER Send free brochure Aristocratft*OIOOORVoL 39w pan 019 power op 3 channels rio greaf sporf froiner 1930s91295 10501 WIHOowA 009 MEN FOR O R200SPON 020 POSERCOSELO Pee OUSEC 015 FOR 2000 coTROL Oo FEE FUR,05*00 PROS M %OLRER E50 Tb FAIRCHILD 22 BELLANCA 19 WingspanprIce lobe #101 sow 09 29 Powerannotint50520 COO OR OO POWER FLMODELS 3 Channel RIC #10791021 el 703 2739593 I2INOOFAR 000 PORtE FOR 00 2sownS 0004*000 000 10* F OR P002155 020 FOsOoE PULSE 020 SOALL &tTIROOOYL011Ni. see local hobby dealer 0643 ASHBY PL FAIRFAX VA 22030 __rOXBAT ~EDRAwiffGSjI AVOqRISON 1977 CATALOG 25$ 48500 MC KENZIE HWY OREGON 97488 DEPT MA 181 PAWNEE STREET I4iWAMS SAN MARCOS CA 92069
Edition: Model Aviation - 1977/05
Page Numbers: 10, 11, 91, 92
S I] George M Myers EVERY SO OFTEN feel inclined pass along some simple little electronic gadgets fun build use column guys hot soldering irons snappy side-cutters Fig 1 shows kit item sincerely believe should found transmitter Flight Pacer avail able Telecraft Box 495 Kirkland WA 98033 price make use ticket group B items received AMA renewal $10 didnt renew price $1295 keep telling pays belong AMA president Telecraft Boeing Hawks also year Vince Calouri has given permission reproduce cir cuit will found Fig 2 14yr old son Tim built less hour operation device emits loud beep intervals pre-select 15 10 minutes available mounted transmitter shown Fig 3 connected receive power whenever transmitter operating beeps can used time out sailplane flights pattern flights can warn helicopter pilots impending fuel exhaustion its im portant function keep reminding transmitter turned very handy around shop especially finish setting up controls new plane go bed thinking system charge isnt because left transmitter turned Also number times people have heard thing beeping car way field downright embarrassing fortunate receive very first have using since 1973 Right now feel un comfortable fly system Try youll like word caution order stallation device other can affect operation RC system Nicad batteries once charged awful hurry dump charge through metallic path such tip soldering iron Therefore first step should locate remove battery lead transmitter On/Off switch Tape end keep out mischief connecting red lead Flight Pacer switch terminal feeds transmitter circuit board black lead negative side bat tery pack ground whichever appro priate situation case Tims Cox/Sanwa radio switch very tiny buried closely-packed trans mitter necessary remove switch gain access common ter minal black wires come together red wire s center terminal three rather closelyspaced terminals recognized poten tial problem dealt above someone less familiar electronics might tempted work red wire place could have expensive con sequences Put red wire back place last step installation Brad Eaton Pompton Plains NJ sent laM BZK 8 N Lf4zzi2 NESSS IL~J1 Fig 2 Schematic Flight Pacer kit emphasizes small number components quite reliable authors tests verified 10 Model Aviation Fig 1 Containing small number parts Flight Pacer kit reviewed text builds easily Use 27-watt iron 1/8-in tip VSIL1S ss-r IA1E So s-ve VOLTS Fig 3 Flight Pacer shown mounted Zap Cox/Sanwa radio emits audible signal adjusted what flight-timing needs may very nice letter last August detailing Servo Reverser shown Fig 4 5 Quoting Brads letter have tested circuit over voltage tem perature ranges far exceeding modeler will encounter normal circum stances circuit sensitive temperature long good tantalum mylar capacitor used timing cir cuit unit calibrated putting transmitter controls neutral installing reverser between servo receiver Turn system shunt timing resistor various values resistance Rt until servo sits same neutral position reverser Ive built works fine past years Ive reversed servos times have recheck service literature find out built originally Its lot easier use reverser have room Again quoting Mr Eatons letter Fig 4 shows circuit diagram positive pulse system Fig S shows negative pulse system Pro-Line Circuit operation positive pulse mode follows 1 Gate inverts pulse receiver/decoder 2 The output triggers 555 timer holds Gate B off 3 The 555 timed pulse width equal double normal pulse width receiver/decoder 4 The 555 pulse inverted pulse combined Gate B thereby providing reverse direction information 5 Gates C D parallel invert pulse re-establish positive pulse mat increase output drive capabili ties Operation negative-pulse systems similar circuit consumes less 5 ma can further reduced expensive RCA CD4047 used replace 555 timer Parts should available parts distributor like Poly-Paks couple dollars Put servo reverser middle aileron extender cable get simple circuit connections flying buddy Bob Aberle suggests Zap ICs back-to-back wire point-to-point save making PC board Encapsulate finished product block epoxy Ready-made servo reversers also available Quantized Control PO Box 164 Amherst MA 01002 cant comment performance because Ive never actually used ultimate solution course Kraft Signature series equivalent provides servo direction deflection controls front panel absence above owe Brad Eaton vote thanks sharing work us Note Observe usual precautions working CMOS components avoid damage static electricity charges Fig 6 shows another useful gadget found Dallas RC Newsletter News lifted ARCS newsletter credited Hank Rejuneic Write see Hank Ill know send check Hanks Glitch Detector good example turning problems advantage DTL Diode-Transistor Logic integrated cir cuits very sensitive noise Hank uses property detect intermittent voltage drops loaded battery pack use load 10-ohm resistor placed battery pilot light latched using pushbutton Next tap around six sides battery pack using pencil chiselshaped extra erasers end bopper light goes out battery pack has problems should check resolder necessary joint pack pigtail wires plug doesnt fix trouble batteries should checked cell-by-cell isolate culprit still cant find use battery pack power fuel pump hook cells parallel glow-plug battery heavens sake dont fly thing like about gadget can used field plane make adapter fits charging jack can hold plane up its wings run engine see vibration getting battery pack assuming have new plane thats giving trouble Simple screwdriver about useful Incidentally before get lot letters about charging Nicads parallel dont easiest way switch four cells series parallel reliably use two Noble 4P2T switches such used switch harnesses Fig 7 shows use defective power pack continued page 91 4 J 0I, s4 5I6t4AL Th CD 40i11I POSDI8X Dli ICi MC 84 5L ~03 FAitCIibTL IC 5TATooio Fig 4 Brad Eatons servo reverser connected positive pulse 4ev q 13 I CA CD4011 /t 3 4 ~4 sitc LF Fig 5 Eatons servo reverser connected negative-pulse systems - - sflt1 C4A6en 21LCISt3 TUfT Fig 7 use defective power pack glow-plug energizer May1977 11 SICJAL ltd Fig 6 Hanks glitch detector Ole RAMPS U ALL 72MHz 27MHz SYSTEMS NOW Ready delivery Featuring interference resistant transmitter receiver combination available trade Radiates highest signal level yes unit market today Proven helicopter capability Demonstratably faster powerful servos outstand ing resolution centering Stick assemblies smooth silk through out temperature range 10 1200F Transmitter control stick unit designed maximum comfort has feel instills confidence re duces fatigue Reliability has design goal Full 6 months warranty immediate factory servicing Study spec sheet free asking compare anything now being offered Youll see believe know VARIANT way go Visit us Toledo Show WESTPORT INTERNATIONAL INC 347 Boston Post Road Milford Conn 06460 will yield peak flight performance stock props Reworked props have tailored according ideas presented article Primarily diameter and/or pitch increase over acceptable stock props strived keeping rpm maximum engine horsepower range exten sive original prop work completed props checked excellent mula-I aircraft K&B 40 S III en gine flown proven competitive Chart information presented ob tained running session accu rate comparisons Results achieved inferior engine running under far ideal climatic conditions rpm shown about 2000 rpm below normal engine expectancy under better conditions Test equipment used K&B S III engine expanded meter photo cell tach ometer specially built thrust stand Engine tach purchased items nothing special thrust stand precision built fulfilling lifelong desire Although thrust stand readings needed comparative accurate Highest speed prop thrust reading 144 oz 9 lbs great deal thrust 40 cubic inch engine indicating outstanding work en gine manufacturers have extended us last few years interesting know stunt-type propeller yields considerably static thrust best speed props Chart #3 presented evaluation differences tested blade shapes No tempt has ever made experiment blade shape specific size propeller however chart comparisons dicate work area could beneficial According chart #2s test results expected determine super prop frankly super prop yet developed tests really show consequences alternating various de sign parameters example first three tests made same prop simply clipping tips time reduce diameter marked rpm crease indicates added horsepower small static thrust loss increased aircraft speed Remember test conducted starting too much prop same improvement can expected using right size prop beginning Note large static thrust increase gained wider blade width Such has proven beneficial actual racing symmetrical airfoil experiments drag reduction interesting changing lower drag airfoil diameter pitch increased horsepower loss Symmetrical airfoil props have used actual race performances yet flight tests indicate show great promise profitable future development conclusion purpose article hopefully incite intelligent speed propeller experimentation field Past racing performances too us have proven considerably propeller efficiency improvement sorely needed nation-wide break sound barrier someday must work ourselves fellow racers lets get up go Radio Technique/Myers continued page 11 glow-plug energizer have both switches 15 VDC side can light glow plug cant charge pack both switches 48 VDC side can charge pack cant light glow plug switch set direction pack Off cant anything except possibly draw current cell number 1 theres some way connect between 8 terminal Since already know least cells bad install piece wire place cell #1 theres no way draw current switches opposing positions can get fancy put whole thing plastic case 0-to-S Amp meter iron-vane types preferred durability low cost May1977 91 have pretty nice starting setup Well thats about month gang Gotta go shovel some unusual weather having off sidewalk Write youve got idea column please George M Myers 70 Froehlich Farm Rd Hicksville NY 11801 RC Scale/Atkinson continued page 18 cause contact cement constitutes 50% weight Make sure skin well attached core 50% strength wing its skin After wing halves epoxied together always apply least 3-in-wide glass tape center wing epoxy well Cut-outs servos etc can weaken FINE QUALITY KITS AND ACCESSORIES 1 /72 SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SPINNERS TS LS ENGINEKITS INEGUNS CYLINDERS L PANTS SCALE DRAWINGS PIES SEND 50c FOR COMPLETE CATALOG center wing tape will join skin right wing left foam wing cases especially tap ered wing truer all-wood wing can Also wash-in wash-out can achieved satisfactorily complex cut elliptical wing such Spitfire Typhoon Since cannot cut curved core cases can achieved cutting back leading trailing edge cutting elliptical shape Carefully shape sharp knife sandpaper block match airfoil foam core hard sounds built Hawker Fury several years ago using method wing came out very well Stuka Corsair also have rather unique wings may cut several sections plywood gussets attached form inverted gull-wing effect foam wings scale models new get some foam try different types wings will surprised what can done foam little ingenuity Bud Atkinson 734 North 6th St Ter race Blue Springs MO 64015 RC Old-Timers/Bolton continued page 21 elers Tim Banaszals Sec/Treas 1947 Superior Ave Whiting IN 46394 Model Engine Collectors Assn PO Box 725 Indianapolis IN 46206 Letters received fine letter Mr Ray Heit Los Alamitos Calif concern ing January column Ray originally designed Scram Doc Mathews recently built captured photo sent us Ray writes uilt original Scram Flying Aces magazine published July 1938 Vol 29 Scram several models designed myself magazine.. 17. m 7-foot wing powered eternal Brown Jr . Interestingly quite coincidental just recently finished almost exact dupli cate Scram. model has taken nearly eight months complete mention way comparison sev eral days took finish model back good old days.. consuming hobby. sneak out shop bury myself balsa glue .. Scram outfitted radio control throttle rudder elevator plus re enforcing wings empennage Other its authentic original color red cream Ray goes talk about growing up Brooklyn member Brooklyn Skyscrapers says contests time held Brunswick NJ guys like Kovel Basett Zaic Shere shaw somebody called Ehling fly against Ray made Nationals Akron Detroit St Louis goes uilding model air planes still favorite hobbies. solid enjoyment thera peutic relaxation Thank Ray enjoyable letter Keith Williams out Bartels ville OkIa received great treatise exposure early gas modeling rewards gathered lucky enough proud owner Bantam 19 first engine Keith dwells early activity area some pros like Jack Cordell winning everything sight recalls Cordell using folding props Comet Mercury similar stuff Keith states hasnt heard since Well Keith head down Pensacola watch Tom McLaughlan turn up Rossi 15 26000 using fold ing props Toms master machinist believe need just able construct something capable handling 26000 rpm way Tom number man forthcoming FAI Power team also builds Old-Timers has Zipper something else also has big original C job own design can document back 40 have bugging him come up set plans ship Anyway back Keith writes got rein volved Old-Timers has stable ships wouldnt believe has Playboy Sr Jr Powerhouse Struck Super Cloud Flying Cloud Korda Wake field 020 Sailplane Request Gollywok Sparky 21 Buzzard ombshell 0 10 building Comet Sail plane just about out room Keith flies Powerhouse RC assist great letter highly motivated guy Keith says summer hes going over win Doc Mathews hardware forth coming contests Out west coast SAM 21 revving up full bore 1977 season dedicated RC assist group out San Jose area led President 92 Model Aviation AMERICAN riisan C3B ThCLASSICS KINNERworlds finest models SPORTSTER Send free brochure Aristocratft*OIOOORVoL 39w pan 019 power op 3 channels rio greaf sporf froiner 1930s91295 10501 WIHOowA 009 MEN FOR O R200SPON 020 POSERCOSELO Pee OUSEC 015 FOR 2000 coTROL Oo FEE FUR,05*00 PROS M %OLRER E50 Tb FAIRCHILD 22 BELLANCA 19 WingspanprIce lobe #101 sow 09 29 Powerannotint50520 COO OR OO POWER FLMODELS 3 Channel RIC #10791021 el 703 2739593 I2INOOFAR 000 PORtE FOR 00 2sownS 0004*000 000 10* F OR P002155 020 FOsOoE PULSE 020 SOALL &tTIROOOYL011Ni. see local hobby dealer 0643 ASHBY PL FAIRFAX VA 22030 __rOXBAT ~EDRAwiffGSjI AVOqRISON 1977 CATALOG 25$ 48500 MC KENZIE HWY OREGON 97488 DEPT MA 181 PAWNEE STREET I4iWAMS SAN MARCOS CA 92069
