Control Line Racing John Ballard THE CONTEST SEASON Midwest area full swing first major Mid western Regionals held outside Chicago Sugar Grove IL typical Racing events Rat Scale Slow Rathad minimum 12 15 entries event Over relatively mild winter several competitors certainly done homework Larry Dziak showed up new heavily modified Nelson long stack 15 ran 145 149 traffic winning time Scale 550 second place 601 made some excellent racing Rat Race certalnly mixed bag several competitors trying new AAC piston liner setups high-compres sion Nelson funny head has onepiece Nelson plug Nelson plug seems quite satisfactory almost Racing applica tions long proper head clearance maintained Rat Race times nothing write home about Several teams having warm-up prob lems AAC engines since tempera ture approximately 450 stiff wind very unusual Labor Day weekend Most Rat Race entries have now gone two-man pitting applying glow plug TI connection starting engine other attaching battery starting engine holding plane refueling appears man doing filling also holds aircraft much easier pit man filling Slow Rat showed variety competitors well opening up fuel shutoff sporting new Nelson Supertigre X35 isnt miscommunication flooded en- runs very well believe will find gine other mans responsibility merely Continued page 156 September 1987 73 Crankshaft venturi mods K&B 15 add least 500 rpm es Dencn Look closely atthe modified crankAbove R see enlarged bore intake passage Other photo Below gives better Idea crank-bore Increase L increased bore venturi L Do-ityourself let Ron Young Performance Engines yIf1ars Limited Edition ectors Issue Capture action excitement planes pilots years NATS beautiful 14 page full color 12 xl 8 commemorative 1988 calendarl ORDER NOWmonly $995 Before thisLII~ZIIoLShipping & handling LIMITED EDITIONtWJ$2 50 first calendar Collectors Calendar sold ESSIVE IMAGE STUDIOS $100 ea addtl OFFICIAL Photographers AMA NATS 6818 Odana Road Madison WI 53719 608 833-9490 Mount tank connect tubes required choose use uniflow system discussed last month hook up see pictures ie uniflow pipe connected fuse-mounted filler tube overflow tube capped piece ofsealed tubing cap will removed fill tank replaced Final weight modified Twister can anywhere 35 40 oz Mine came out 38 balanced between three-quarters inch forward spot shown plan CG using Merco 40 spinner muffler OS 40 stock muffler choose use longer tail moreforward CG will provide sedate first flight positive line tension Very little wing tip ballast necessary profile since weight engine tank controls outboard centerline forgot cut wing tip remove some ballast would start out add flight tests show necessary pick model up crankshaft tail outboard wing should drop softly ground Betcha does See field Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 CL Scale/Boss Continued page 71 along subject model unit static judging Proper documentation model towing system towed object must provided within specified number pages allowable data Please note rule interpretation personal interpretation Dave has indicated Michacls need further official consideration question Michaels should ask full Scale Contest Board interpretation would like close discussion rules two thoughts First reminder members Scale Contest Board have already cast Final Vote current set rules-change proposals Second have particular section rules believe needs discussion column would too glad hear Something newfrom Bell Rock Industries BRI helps make building easier its Grate-Shapes Weight-Mates GreatShapes series sanding blocks about 10 long number shapes thatwill fit almost model sanding chores silicon carbide grit sanding tools made work surfaces suitable shaping round flat square V concave surfaces offered number sizes shape style sanding tools excellent doing much rough sanding such parts leading trailing edges wings tall surfaces long straight edges word caution offered BRI recommend tools used balsawood foam other soft materials recommended use hard gummy woods metal materials will greatly shorten useful lives Prices Grate-Shapes range $495 set three squares sized $2195 six-pack combination other item mentioned Weight-Mates four- six-inch canvas-like bags filled lead shot sand weigh approx imately five pounds can used hold model parts firmly place during construction bags can also used tie-downs model during transportation bags come five pack sell $695 complete detalls sizes shapes pricing write BRI 6486 Hwy 179Suite 108 Sedona AZ 86336 Contest activity September 20 1987 Garden State Circle Burners GSCB will hosting its annual Bendix/Teterboro Scale rally Precision Sport Profile classes being offered awards form trophies merchandise fifth place event George Gaydos CD hoping years entries wlll surpass 23 last year meet held Bendix Co parking lot adjacent west side Teterboro airport all-blacktop parking lot makes good Scale flying AMA rules apply Precision Sport classes Profile event will flown according GSCBs own rules full contest details copy Profile Scale rules write G Gaydos 8 Dapp Court Elmwood Park NJ 07407 Please send correspondenceespecially photosrelating CL Scale Bill Boss 7706 269th Street New Hyde Park NY 11040 responding advertisers mention read about Model Aviation CL Speed/Hempel Continued page 72 envelope SASE address given end column Another hot item related Speed upcoming -scale NHRA National Hot Rod Association drag-racing funny cars Since Texas hotbed racing activity Southwest full-size racing cars well model cars recently opportunity work some wild little machines speeds attained model cars reach over 100 mph Some technical notes concerning model cars follows frame constructed aircraft-grade tubular steel heli-arc welded rigid built-in roll cage beautiful hand-laid fiberglass body covers frame sold ready paint racing decor centrifugal clutch drive traln permits easy starting engine smooth idling fast acceleration Dual inboard rear disc brakes combined real working drag parachute provide means slowing down after fast run down track several types englnes used cars engine used manufacturer cars months photos Zenoah 140 two-cycle chromed cylinder bore engines have plenty space cylinder experiment port timing engine coupled rear wheels fully enclosed three-stage gearbox Different gear ratios available rear drive axle participation model racing events averages 25 30 entrants weekend race track Its very exciting informa tion mail SASE Discount RYC Hobbies 605 South Sherman St Richardson TX 75081 telephone number 214 669-3705 Gene Hempel 301N YaleDr Garland TX 75042 CL Racing/Ballard Continued page 73 engines will dominant force Nationals since seem overpower almost K&B OS presently existence Slow Rat times averaged under six minutes good first major meet 87 Midwest season Engine modification to K&B 15 am Continued page 158 156 Model Aviation HOBBYPOXY TRUE TM-PART EPOXY PAINTS 16 COLORS R ER EPOXY GLUES FOUR FORMULAS 5-MIN 1V 45-MIN FAST FILL GRAIN FILLER QUICK-PREP POLYESTER RESIN FREE COLOR CARD AND BROCHURE HOWfPOXY DIVISION P116 Pwini Company Inc 36 Pine Sired Rocieway NJ 07666 PRACTICAL SIZED GIANT Order Canopies Available Plans sent Post-Paid within USA Send 5Oe Full Catalog Balsa Nick Ziroli 29 EdMar Dr Smithiown NY 11787 USA MODELS NICK ZIROLI Jets too Plans RK-20 RK-740 Ducted Fans Phantom38 span$1000 Viggen32 span$1000 F-1538 span$1000 Plan canopy$1500 516-234-5038 enclosing some photos modifications K&B 15 definitely improve ground rpm engine resulting airspeed As can see photograph stock crank left crank right has enlarged extra meat has taken out shaft area addition venturi has enlarged some 015 second photograph shows enlarge ment venturi well giving view back crank can see enlarged hole extra meat removed up near timing area particular cranks close around 620 after top dead center ATDC Ron Youngs Performance Engines will rework cranks you can make modifica tion yourself Ron indicates enlarged crankshaft K&B/Cox 15 will flow approximately 30% air through engine minimum 500 rpm gain test stand Racing tank refueling procedures Several Gone forever nightmare heli-flier dreads stepping 3 foot tenna ripping off front prized chopper just ifs ready fly Base loaded short WHIPANTENNA f iveshidden performance Less 7 ong can mounted project front helicopter inside canopy ts virtually invtsible cZv~ 00R0A54 MODEL PRODUCTS 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 competitors have written asking prevent damage fuel tank fill tube during hasty pit stop tube occasionally pushed down quick-fill too far rams hole bottom tank Ron Esman Texas Racing contingent found soldering small ring onto neck fuel filler ring prevents fill tube going too far tank Also size ring prevents fuel squirting back pit mans face deflects spray either side aircraft ring can easily fabricated large washer soldered place after measuring length tube enters tank Mouse Racing Al Lidberg Tempe AZ has sent some plans Annie Mouse Racer particular aircraft flies very well has very successful local competition flying area am including plan months column am sure would like further information can write Al Lidberg 614 W Fordham Tempe AZ 85283 St Louis alive well just talked Gary Frost St Louis area indicated both flying field club both excellent health Gary planning early October contest 87 people have written asked what happened St Louis will understand contest schedule once again reinstated major problem Buder Park flying site last summers contest schedule interruption park used horse shows instead model airplanes Gary assures has rectified 1987 fine Midwest site should again scene fine annual meet AMA records Racing received several requests mentioning Racing events being cluded AMA National Records As talk AMA district representatives both VP CL Contest Board please men tion Racing contingent would like have AMA records Racing events am sure voice heard something will done F2C Team Racer drawings have over dozen requests six sets plans Russian TRs. have sent copies everyone requested anyone else might have missed column still have several copies left will happy forward As always comments photographs appreciated John C Ballard 10102 Kimblewick Dr Louisville KY 40223 Charger/Kopski Continued page 84 dont feel comfortable confident sol dering get someone help works Space does permit detailed discussion technical details circuity operation Id like least pass along brief explanation basic idea involved As mentioned above although DC/DC Super Charger fully adjustable may provide stable charge current because set value current part dependent certain conditions external charger modification presented corrects adding internal reference charge current feedback circuit au tomatically adjusts charger operation output current should stray chosen value Referring schematic modified charger output current flows through ohm sampling resistor RL-R2 voltage appearing across resistance directly proportional charge current small circuit-card subassembly contains PNP transistor base-emitter junc tion watches voltage Adjustable divider R3-R4the new current control selects portion R1-R2 voltage application transistor Note R4 rewired original 10K control plus range switch still used adjust desired output current collector transistor con nected original electronics charger control pot origi nally wired effect transistor comes new controlling device original circuit happens because transistor collector will conduct current base emitter junction does So depending setting R4 sampled charge current causes about 06 volts often called VBE Threshold used voltage reference appear base-emitter junction tran sistor collector applies control signal original location adjustment control done way maintain steady output current 158 Model Aviation DC-3 1140 Span$4200 F4U CORSAIR2% Span$3000 ASMS ZERO2% pan$3000 CURTIS P402% Span$3000 AT-S TEXAN24 Span$3000 F8FBEARCAT2% Span$3000 FOKKERDR-127 Tripa$2700 Whip Antenna Gives Hidden Performance
Edition: Model Aviation - 1987/09
Page Numbers: 73, 156, 158
Control Line Racing John Ballard THE CONTEST SEASON Midwest area full swing first major Mid western Regionals held outside Chicago Sugar Grove IL typical Racing events Rat Scale Slow Rathad minimum 12 15 entries event Over relatively mild winter several competitors certainly done homework Larry Dziak showed up new heavily modified Nelson long stack 15 ran 145 149 traffic winning time Scale 550 second place 601 made some excellent racing Rat Race certalnly mixed bag several competitors trying new AAC piston liner setups high-compres sion Nelson funny head has onepiece Nelson plug Nelson plug seems quite satisfactory almost Racing applica tions long proper head clearance maintained Rat Race times nothing write home about Several teams having warm-up prob lems AAC engines since tempera ture approximately 450 stiff wind very unusual Labor Day weekend Most Rat Race entries have now gone two-man pitting applying glow plug TI connection starting engine other attaching battery starting engine holding plane refueling appears man doing filling also holds aircraft much easier pit man filling Slow Rat showed variety competitors well opening up fuel shutoff sporting new Nelson Supertigre X35 isnt miscommunication flooded en- runs very well believe will find gine other mans responsibility merely Continued page 156 September 1987 73 Crankshaft venturi mods K&B 15 add least 500 rpm es Dencn Look closely atthe modified crankAbove R see enlarged bore intake passage Other photo Below gives better Idea crank-bore Increase L increased bore venturi L Do-ityourself let Ron Young Performance Engines yIf1ars Limited Edition ectors Issue Capture action excitement planes pilots years NATS beautiful 14 page full color 12 xl 8 commemorative 1988 calendarl ORDER NOWmonly $995 Before thisLII~ZIIoLShipping & handling LIMITED EDITIONtWJ$2 50 first calendar Collectors Calendar sold ESSIVE IMAGE STUDIOS $100 ea addtl OFFICIAL Photographers AMA NATS 6818 Odana Road Madison WI 53719 608 833-9490 Mount tank connect tubes required choose use uniflow system discussed last month hook up see pictures ie uniflow pipe connected fuse-mounted filler tube overflow tube capped piece ofsealed tubing cap will removed fill tank replaced Final weight modified Twister can anywhere 35 40 oz Mine came out 38 balanced between three-quarters inch forward spot shown plan CG using Merco 40 spinner muffler OS 40 stock muffler choose use longer tail moreforward CG will provide sedate first flight positive line tension Very little wing tip ballast necessary profile since weight engine tank controls outboard centerline forgot cut wing tip remove some ballast would start out add flight tests show necessary pick model up crankshaft tail outboard wing should drop softly ground Betcha does See field Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 CL Scale/Boss Continued page 71 along subject model unit static judging Proper documentation model towing system towed object must provided within specified number pages allowable data Please note rule interpretation personal interpretation Dave has indicated Michacls need further official consideration question Michaels should ask full Scale Contest Board interpretation would like close discussion rules two thoughts First reminder members Scale Contest Board have already cast Final Vote current set rules-change proposals Second have particular section rules believe needs discussion column would too glad hear Something newfrom Bell Rock Industries BRI helps make building easier its Grate-Shapes Weight-Mates GreatShapes series sanding blocks about 10 long number shapes thatwill fit almost model sanding chores silicon carbide grit sanding tools made work surfaces suitable shaping round flat square V concave surfaces offered number sizes shape style sanding tools excellent doing much rough sanding such parts leading trailing edges wings tall surfaces long straight edges word caution offered BRI recommend tools used balsawood foam other soft materials recommended use hard gummy woods metal materials will greatly shorten useful lives Prices Grate-Shapes range $495 set three squares sized $2195 six-pack combination other item mentioned Weight-Mates four- six-inch canvas-like bags filled lead shot sand weigh approx imately five pounds can used hold model parts firmly place during construction bags can also used tie-downs model during transportation bags come five pack sell $695 complete detalls sizes shapes pricing write BRI 6486 Hwy 179Suite 108 Sedona AZ 86336 Contest activity September 20 1987 Garden State Circle Burners GSCB will hosting its annual Bendix/Teterboro Scale rally Precision Sport Profile classes being offered awards form trophies merchandise fifth place event George Gaydos CD hoping years entries wlll surpass 23 last year meet held Bendix Co parking lot adjacent west side Teterboro airport all-blacktop parking lot makes good Scale flying AMA rules apply Precision Sport classes Profile event will flown according GSCBs own rules full contest details copy Profile Scale rules write G Gaydos 8 Dapp Court Elmwood Park NJ 07407 Please send correspondenceespecially photosrelating CL Scale Bill Boss 7706 269th Street New Hyde Park NY 11040 responding advertisers mention read about Model Aviation CL Speed/Hempel Continued page 72 envelope SASE address given end column Another hot item related Speed upcoming -scale NHRA National Hot Rod Association drag-racing funny cars Since Texas hotbed racing activity Southwest full-size racing cars well model cars recently opportunity work some wild little machines speeds attained model cars reach over 100 mph Some technical notes concerning model cars follows frame constructed aircraft-grade tubular steel heli-arc welded rigid built-in roll cage beautiful hand-laid fiberglass body covers frame sold ready paint racing decor centrifugal clutch drive traln permits easy starting engine smooth idling fast acceleration Dual inboard rear disc brakes combined real working drag parachute provide means slowing down after fast run down track several types englnes used cars engine used manufacturer cars months photos Zenoah 140 two-cycle chromed cylinder bore engines have plenty space cylinder experiment port timing engine coupled rear wheels fully enclosed three-stage gearbox Different gear ratios available rear drive axle participation model racing events averages 25 30 entrants weekend race track Its very exciting informa tion mail SASE Discount RYC Hobbies 605 South Sherman St Richardson TX 75081 telephone number 214 669-3705 Gene Hempel 301N YaleDr Garland TX 75042 CL Racing/Ballard Continued page 73 engines will dominant force Nationals since seem overpower almost K&B OS presently existence Slow Rat times averaged under six minutes good first major meet 87 Midwest season Engine modification to K&B 15 am Continued page 158 156 Model Aviation HOBBYPOXY TRUE TM-PART EPOXY PAINTS 16 COLORS R ER EPOXY GLUES FOUR FORMULAS 5-MIN 1V 45-MIN FAST FILL GRAIN FILLER QUICK-PREP POLYESTER RESIN FREE COLOR CARD AND BROCHURE HOWfPOXY DIVISION P116 Pwini Company Inc 36 Pine Sired Rocieway NJ 07666 PRACTICAL SIZED GIANT Order Canopies Available Plans sent Post-Paid within USA Send 5Oe Full Catalog Balsa Nick Ziroli 29 EdMar Dr Smithiown NY 11787 USA MODELS NICK ZIROLI Jets too Plans RK-20 RK-740 Ducted Fans Phantom38 span$1000 Viggen32 span$1000 F-1538 span$1000 Plan canopy$1500 516-234-5038 enclosing some photos modifications K&B 15 definitely improve ground rpm engine resulting airspeed As can see photograph stock crank left crank right has enlarged extra meat has taken out shaft area addition venturi has enlarged some 015 second photograph shows enlarge ment venturi well giving view back crank can see enlarged hole extra meat removed up near timing area particular cranks close around 620 after top dead center ATDC Ron Youngs Performance Engines will rework cranks you can make modifica tion yourself Ron indicates enlarged crankshaft K&B/Cox 15 will flow approximately 30% air through engine minimum 500 rpm gain test stand Racing tank refueling procedures Several Gone forever nightmare heli-flier dreads stepping 3 foot tenna ripping off front prized chopper just ifs ready fly Base loaded short WHIPANTENNA f iveshidden performance Less 7 ong can mounted project front helicopter inside canopy ts virtually invtsible cZv~ 00R0A54 MODEL PRODUCTS 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 competitors have written asking prevent damage fuel tank fill tube during hasty pit stop tube occasionally pushed down quick-fill too far rams hole bottom tank Ron Esman Texas Racing contingent found soldering small ring onto neck fuel filler ring prevents fill tube going too far tank Also size ring prevents fuel squirting back pit mans face deflects spray either side aircraft ring can easily fabricated large washer soldered place after measuring length tube enters tank Mouse Racing Al Lidberg Tempe AZ has sent some plans Annie Mouse Racer particular aircraft flies very well has very successful local competition flying area am including plan months column am sure would like further information can write Al Lidberg 614 W Fordham Tempe AZ 85283 St Louis alive well just talked Gary Frost St Louis area indicated both flying field club both excellent health Gary planning early October contest 87 people have written asked what happened St Louis will understand contest schedule once again reinstated major problem Buder Park flying site last summers contest schedule interruption park used horse shows instead model airplanes Gary assures has rectified 1987 fine Midwest site should again scene fine annual meet AMA records Racing received several requests mentioning Racing events being cluded AMA National Records As talk AMA district representatives both VP CL Contest Board please men tion Racing contingent would like have AMA records Racing events am sure voice heard something will done F2C Team Racer drawings have over dozen requests six sets plans Russian TRs. have sent copies everyone requested anyone else might have missed column still have several copies left will happy forward As always comments photographs appreciated John C Ballard 10102 Kimblewick Dr Louisville KY 40223 Charger/Kopski Continued page 84 dont feel comfortable confident sol dering get someone help works Space does permit detailed discussion technical details circuity operation Id like least pass along brief explanation basic idea involved As mentioned above although DC/DC Super Charger fully adjustable may provide stable charge current because set value current part dependent certain conditions external charger modification presented corrects adding internal reference charge current feedback circuit au tomatically adjusts charger operation output current should stray chosen value Referring schematic modified charger output current flows through ohm sampling resistor RL-R2 voltage appearing across resistance directly proportional charge current small circuit-card subassembly contains PNP transistor base-emitter junc tion watches voltage Adjustable divider R3-R4the new current control selects portion R1-R2 voltage application transistor Note R4 rewired original 10K control plus range switch still used adjust desired output current collector transistor con nected original electronics charger control pot origi nally wired effect transistor comes new controlling device original circuit happens because transistor collector will conduct current base emitter junction does So depending setting R4 sampled charge current causes about 06 volts often called VBE Threshold used voltage reference appear base-emitter junction tran sistor collector applies control signal original location adjustment control done way maintain steady output current 158 Model Aviation DC-3 1140 Span$4200 F4U CORSAIR2% Span$3000 ASMS ZERO2% pan$3000 CURTIS P402% Span$3000 AT-S TEXAN24 Span$3000 F8FBEARCAT2% Span$3000 FOKKERDR-127 Tripa$2700 Whip Antenna Gives Hidden Performance
Edition: Model Aviation - 1987/09
Page Numbers: 73, 156, 158
Control Line Racing John Ballard THE CONTEST SEASON Midwest area full swing first major Mid western Regionals held outside Chicago Sugar Grove IL typical Racing events Rat Scale Slow Rathad minimum 12 15 entries event Over relatively mild winter several competitors certainly done homework Larry Dziak showed up new heavily modified Nelson long stack 15 ran 145 149 traffic winning time Scale 550 second place 601 made some excellent racing Rat Race certalnly mixed bag several competitors trying new AAC piston liner setups high-compres sion Nelson funny head has onepiece Nelson plug Nelson plug seems quite satisfactory almost Racing applica tions long proper head clearance maintained Rat Race times nothing write home about Several teams having warm-up prob lems AAC engines since tempera ture approximately 450 stiff wind very unusual Labor Day weekend Most Rat Race entries have now gone two-man pitting applying glow plug TI connection starting engine other attaching battery starting engine holding plane refueling appears man doing filling also holds aircraft much easier pit man filling Slow Rat showed variety competitors well opening up fuel shutoff sporting new Nelson Supertigre X35 isnt miscommunication flooded en- runs very well believe will find gine other mans responsibility merely Continued page 156 September 1987 73 Crankshaft venturi mods K&B 15 add least 500 rpm es Dencn Look closely atthe modified crankAbove R see enlarged bore intake passage Other photo Below gives better Idea crank-bore Increase L increased bore venturi L Do-ityourself let Ron Young Performance Engines yIf1ars Limited Edition ectors Issue Capture action excitement planes pilots years NATS beautiful 14 page full color 12 xl 8 commemorative 1988 calendarl ORDER NOWmonly $995 Before thisLII~ZIIoLShipping & handling LIMITED EDITIONtWJ$2 50 first calendar Collectors Calendar sold ESSIVE IMAGE STUDIOS $100 ea addtl OFFICIAL Photographers AMA NATS 6818 Odana Road Madison WI 53719 608 833-9490 Mount tank connect tubes required choose use uniflow system discussed last month hook up see pictures ie uniflow pipe connected fuse-mounted filler tube overflow tube capped piece ofsealed tubing cap will removed fill tank replaced Final weight modified Twister can anywhere 35 40 oz Mine came out 38 balanced between three-quarters inch forward spot shown plan CG using Merco 40 spinner muffler OS 40 stock muffler choose use longer tail moreforward CG will provide sedate first flight positive line tension Very little wing tip ballast necessary profile since weight engine tank controls outboard centerline forgot cut wing tip remove some ballast would start out add flight tests show necessary pick model up crankshaft tail outboard wing should drop softly ground Betcha does See field Ted Fancher 158 Flying Cloud Isle Foster City CA 94404 CL Scale/Boss Continued page 71 along subject model unit static judging Proper documentation model towing system towed object must provided within specified number pages allowable data Please note rule interpretation personal interpretation Dave has indicated Michacls need further official consideration question Michaels should ask full Scale Contest Board interpretation would like close discussion rules two thoughts First reminder members Scale Contest Board have already cast Final Vote current set rules-change proposals Second have particular section rules believe needs discussion column would too glad hear Something newfrom Bell Rock Industries BRI helps make building easier its Grate-Shapes Weight-Mates GreatShapes series sanding blocks about 10 long number shapes thatwill fit almost model sanding chores silicon carbide grit sanding tools made work surfaces suitable shaping round flat square V concave surfaces offered number sizes shape style sanding tools excellent doing much rough sanding such parts leading trailing edges wings tall surfaces long straight edges word caution offered BRI recommend tools used balsawood foam other soft materials recommended use hard gummy woods metal materials will greatly shorten useful lives Prices Grate-Shapes range $495 set three squares sized $2195 six-pack combination other item mentioned Weight-Mates four- six-inch canvas-like bags filled lead shot sand weigh approx imately five pounds can used hold model parts firmly place during construction bags can also used tie-downs model during transportation bags come five pack sell $695 complete detalls sizes shapes pricing write BRI 6486 Hwy 179Suite 108 Sedona AZ 86336 Contest activity September 20 1987 Garden State Circle Burners GSCB will hosting its annual Bendix/Teterboro Scale rally Precision Sport Profile classes being offered awards form trophies merchandise fifth place event George Gaydos CD hoping years entries wlll surpass 23 last year meet held Bendix Co parking lot adjacent west side Teterboro airport all-blacktop parking lot makes good Scale flying AMA rules apply Precision Sport classes Profile event will flown according GSCBs own rules full contest details copy Profile Scale rules write G Gaydos 8 Dapp Court Elmwood Park NJ 07407 Please send correspondenceespecially photosrelating CL Scale Bill Boss 7706 269th Street New Hyde Park NY 11040 responding advertisers mention read about Model Aviation CL Speed/Hempel Continued page 72 envelope SASE address given end column Another hot item related Speed upcoming -scale NHRA National Hot Rod Association drag-racing funny cars Since Texas hotbed racing activity Southwest full-size racing cars well model cars recently opportunity work some wild little machines speeds attained model cars reach over 100 mph Some technical notes concerning model cars follows frame constructed aircraft-grade tubular steel heli-arc welded rigid built-in roll cage beautiful hand-laid fiberglass body covers frame sold ready paint racing decor centrifugal clutch drive traln permits easy starting engine smooth idling fast acceleration Dual inboard rear disc brakes combined real working drag parachute provide means slowing down after fast run down track several types englnes used cars engine used manufacturer cars months photos Zenoah 140 two-cycle chromed cylinder bore engines have plenty space cylinder experiment port timing engine coupled rear wheels fully enclosed three-stage gearbox Different gear ratios available rear drive axle participation model racing events averages 25 30 entrants weekend race track Its very exciting informa tion mail SASE Discount RYC Hobbies 605 South Sherman St Richardson TX 75081 telephone number 214 669-3705 Gene Hempel 301N YaleDr Garland TX 75042 CL Racing/Ballard Continued page 73 engines will dominant force Nationals since seem overpower almost K&B OS presently existence Slow Rat times averaged under six minutes good first major meet 87 Midwest season Engine modification to K&B 15 am Continued page 158 156 Model Aviation HOBBYPOXY TRUE TM-PART EPOXY PAINTS 16 COLORS R ER EPOXY GLUES FOUR FORMULAS 5-MIN 1V 45-MIN FAST FILL GRAIN FILLER QUICK-PREP POLYESTER RESIN FREE COLOR CARD AND BROCHURE HOWfPOXY DIVISION P116 Pwini Company Inc 36 Pine Sired Rocieway NJ 07666 PRACTICAL SIZED GIANT Order Canopies Available Plans sent Post-Paid within USA Send 5Oe Full Catalog Balsa Nick Ziroli 29 EdMar Dr Smithiown NY 11787 USA MODELS NICK ZIROLI Jets too Plans RK-20 RK-740 Ducted Fans Phantom38 span$1000 Viggen32 span$1000 F-1538 span$1000 Plan canopy$1500 516-234-5038 enclosing some photos modifications K&B 15 definitely improve ground rpm engine resulting airspeed As can see photograph stock crank left crank right has enlarged extra meat has taken out shaft area addition venturi has enlarged some 015 second photograph shows enlarge ment venturi well giving view back crank can see enlarged hole extra meat removed up near timing area particular cranks close around 620 after top dead center ATDC Ron Youngs Performance Engines will rework cranks you can make modifica tion yourself Ron indicates enlarged crankshaft K&B/Cox 15 will flow approximately 30% air through engine minimum 500 rpm gain test stand Racing tank refueling procedures Several Gone forever nightmare heli-flier dreads stepping 3 foot tenna ripping off front prized chopper just ifs ready fly Base loaded short WHIPANTENNA f iveshidden performance Less 7 ong can mounted project front helicopter inside canopy ts virtually invtsible cZv~ 00R0A54 MODEL PRODUCTS 23961 CRAFTSMAN RD CALABASAS CA 91302 818 992-0195 218 VERNON ROAD GREENVILLE PA 16125 412 588-1321 competitors have written asking prevent damage fuel tank fill tube during hasty pit stop tube occasionally pushed down quick-fill too far rams hole bottom tank Ron Esman Texas Racing contingent found soldering small ring onto neck fuel filler ring prevents fill tube going too far tank Also size ring prevents fuel squirting back pit mans face deflects spray either side aircraft ring can easily fabricated large washer soldered place after measuring length tube enters tank Mouse Racing Al Lidberg Tempe AZ has sent some plans Annie Mouse Racer particular aircraft flies very well has very successful local competition flying area am including plan months column am sure would like further information can write Al Lidberg 614 W Fordham Tempe AZ 85283 St Louis alive well just talked Gary Frost St Louis area indicated both flying field club both excellent health Gary planning early October contest 87 people have written asked what happened St Louis will understand contest schedule once again reinstated major problem Buder Park flying site last summers contest schedule interruption park used horse shows instead model airplanes Gary assures has rectified 1987 fine Midwest site should again scene fine annual meet AMA records Racing received several requests mentioning Racing events being cluded AMA National Records As talk AMA district representatives both VP CL Contest Board please men tion Racing contingent would like have AMA records Racing events am sure voice heard something will done F2C Team Racer drawings have over dozen requests six sets plans Russian TRs. have sent copies everyone requested anyone else might have missed column still have several copies left will happy forward As always comments photographs appreciated John C Ballard 10102 Kimblewick Dr Louisville KY 40223 Charger/Kopski Continued page 84 dont feel comfortable confident sol dering get someone help works Space does permit detailed discussion technical details circuity operation Id like least pass along brief explanation basic idea involved As mentioned above although DC/DC Super Charger fully adjustable may provide stable charge current because set value current part dependent certain conditions external charger modification presented corrects adding internal reference charge current feedback circuit au tomatically adjusts charger operation output current should stray chosen value Referring schematic modified charger output current flows through ohm sampling resistor RL-R2 voltage appearing across resistance directly proportional charge current small circuit-card subassembly contains PNP transistor base-emitter junc tion watches voltage Adjustable divider R3-R4the new current control selects portion R1-R2 voltage application transistor Note R4 rewired original 10K control plus range switch still used adjust desired output current collector transistor con nected original electronics charger control pot origi nally wired effect transistor comes new controlling device original circuit happens because transistor collector will conduct current base emitter junction does So depending setting R4 sampled charge current causes about 06 volts often called VBE Threshold used voltage reference appear base-emitter junction tran sistor collector applies control signal original location adjustment control done way maintain steady output current 158 Model Aviation DC-3 1140 Span$4200 F4U CORSAIR2% Span$3000 ASMS ZERO2% pan$3000 CURTIS P402% Span$3000 AT-S TEXAN24 Span$3000 F8FBEARCAT2% Span$3000 FOKKERDR-127 Tripa$2700 Whip Antenna Gives Hidden Performance